Official Journal of the European Union

COMMISSION IMPLEMENTING DECISION

of 28 February 2012

establishing the best available techniques (BAT) conclusions under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions for the manufacture of glass

(notified under document C(2012) 865)

(Text with EEA relevance)

(2012/134/EU)

THE EUROPEAN COMMISSION,

Having regard to the Treaty on the Functioning of the European Union,

Having regard to Directive 2010/75/EU of the European Parliament and of the Council of 24 November 2010 on industrial emissions (integrated pollution prevention and control) (1) and in particular Article 13(5) thereof,

Whereas:

Article 13(1) of Directive 2010/75/EU requires the Commission to organise an exchange of information on industrial emissions between it and Member States, the industries concerned and non-governmental organisations promoting environmental protection in order to facilitate the drawing up of best available techniques (BAT) reference documents as defined in Article 3(11) of that Directive.

In accordance with Article 13(2) of Directive 2010/75/EU, the exchange of information is to address the performance of installations and techniques in terms of emissions, expressed as short- and long-term averages, where appropriate, and the associated reference conditions, consumption and nature of raw materials, water consumption, use of energy and generation of waste and the techniques used, associated monitoring, cross-media effects, economic and technical viability and developments therein and best available techniques and emerging techniques identified after considering the issues mentioned in points (a) and (b) of Article 13(2) of that Directive.

‘BAT conclusions’ as defined in Article 3(12) of Directive 2010/75/EU are the key element of BAT reference documents and lay down the conclusions on best available techniques, their description, information to assess their applicability, the emission levels associated with the best available techniques, associated monitoring, associated consumption levels and, where appropriate, relevant site remediation measures.

In accordance with Article 14(3) of Directive 2010/75/EU, BAT conclusions are to be the reference for setting permit conditions for installations covered by Chapter 2 of that Directive.

Article 15(3) of Directive 2010/75/EU requires the competent authority to set emission limit values that ensure that, under normal operating conditions, emissions do not exceed the emission levels associated with the best available techniques as laid down in the decisions on BAT conclusions referred to in Article 13(5) of Directive 2010/75/EU.

Article 15(4) of Directive 2010/75/EU provides for derogations from the requirement laid down in Article 15(3) only where the costs associated with the achievement of emissions levels disproportionately outweigh the environmental benefits due to the geographical location, the local environmental conditions or the technical characteristics of the installation concerned.

Article 16(1) of Directive 2010/75/EU provides that the monitoring requirements in the permit referred to in point (c) of Article 14(1) of the Directive are to be based on the conclusions on monitoring as described in the BAT conclusions.

In accordance with Article 21(3) of Directive 2010/75/EU, within 4 years of publication of decisions on BAT conclusions, the competent authority is to reconsider and, if necessary, update all the permit conditions and ensure that the installation complies with those permit conditions.

Commission Decision of 16 May 2011 establishing a forum for the exchange of information pursuant to Article 13 of Directive 2010/75/EU on industrial emissions (2) established a forum composed of representatives of Member States, the industries concerned and non-governmental organisations promoting environmental protection.

In accordance with Article 13(4) of Directive 2010/75/EU, the Commission obtained the opinion (3) of that forum on the proposed content of the BAT reference document for the manufacture of glass on 13 September 2011 and made it publicly available.

The measures provided for in this Decision are in accordance with the opinion of the Committee established by Article 75(1) of Directive 2010/75/EU,

HAS ADOPTED THIS DECISION:

Article 1

The BAT conclusions for the manufacture of glass are set out in the Annex to this Decision.

Article 2

This Decision is addressed to the Member States.

(1) OJ L 334, 17.12.2010, p. 17.

(2) OJ C 146, 17.5.2011, p. 3.

(3) http://circa.europa.eu/Public/irc/env/ied/library?l=/ied_art_13_forum/opinions_article

ANNEX

BAT CONCLUSIONS FOR THE MANUFACTURE OF GLASS

SCOPE

DEFINITIONS

GENERAL CONSIDERATIONS

Averaging periods and reference conditions for air emissions

Conversion to reference oxygen concentration

Conversion from concentrations to specific mass emissions

Definitions for certain air pollutants

Averaging periods for waste water discharges

1.1. General BAT conclusions for the glass manufacturing industry

1.1.1. Environmental management systems

1.1.2. Energy efficiency

1.1.3. Materials storage and handling

1.1.4. General primary techniques

1.1.5. Emissions to water from glass manufacturing processes

1.1.6. Waste from the glass manufacturing processes

1.1.7. Noise from the glass manufacturing processes

1.2. BAT conclusions for container glass manufacturing

1.2.1. Dust emissions from melting furnaces

1.2.2. Nitrogen oxides (NO X ) from melting furnaces

1.2.3. Sulphur oxides (SO X ) from melting furnaces

1.2.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.2.5. Metals from melting furnaces

1.2.6. Emissions from downstream processes

1.3. BAT conclusions for flat glass manufacturing

1.3.1. Dust emissions from melting furnaces

1.3.2. Nitrogen oxides (NO X ) from melting furnaces

1.3.3. Sulphur oxides (SO X ) from melting furnaces

1.3.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.3.5. Metals from melting furnaces

1.3.6. Emissions from downstream processes

1.4. BAT conclusions for continuous filament glass fibre manufacturing

1.4.1. Dust emissions from melting furnaces

1.4.2. Nitrogen oxides (NO X ) from melting furnaces

1.4.3. Sulphur oxides (SO X ) from melting furnaces

1.4.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.4.5. Metals from melting furnaces

1.4.6. Emissions from downstream processes

1.5. BAT conclusions for domestic glass manufacturing

1.5.1. Dust emissions from melting furnaces

1.5.2. Nitrogen oxides (NO X ) from melting furnaces

1.5.3. Sulphur oxides (SO X ) from melting furnaces

1.5.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.5.5. Metals from melting furnaces

1.5.6. Emissions from downstream processes

1.6. BAT conclusions for special glass manufacturing

1.6.1. Dust emissions from melting furnaces

1.6.2. Nitrogen oxides (NO X ) from melting furnaces

1.6.3. Sulphur oxides (SO X ) from melting furnaces

1.6.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.6.5. Metals from melting furnaces

1.6.6. Emissions from downstream processes

1.7. BAT conclusions for mineral wool manufacturing

1.7.1. Dust emissions from melting furnaces

1.7.2. Nitrogen oxides (NO X ) from melting furnaces

1.7.3. Sulphur oxides (SO X ) from melting furnaces

1.7.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.7.5. Hydrogen sulphide (H 2 S) from stone wool melting furnaces

1.7.6. Metals from melting furnaces

1.7.7. Emissions from downstream processes

1.8. BAT conclusions for high temperature insulation wools (HTIW) manufacturing

1.8.1. Dust emissions from melting and downstream processes

1.8.2. Nitrogen oxides (NO X ) from melting and downstream processes

1.8.3. Sulphur oxides (SO X ) from melting and downstream processes

1.8.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.8.5. Metals from melting furnaces and downstream processes

1.8.6. Volatile organic compounds from downstream processes

1.9. BAT conclusions for frits manufacturing

1.9.1. Dust emissions from melting furnaces

1.9.2. Nitrogen oxides (NO X ) from melting furnaces

1.9.3. Sulphur oxides (SO X ) from melting furnaces

1.9.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

1.9.5. Metals from melting furnaces

1.9.6. Emissions from downstream processes

Glossary:

1.10. Description of techniques

1.10.1. Dust emissions

1.10.2. NO X emissions

1.10.3. SO X emissions

1.10.4. HCl, HF emissions

1.10.5. Metal emissions

1.10.6. Combined gaseous emissions (e.g. SO X , HCl, HF, boron compounds)

1.10.7. Combined emissions (solid + gaseous)

1.10.8. Emissions from cutting, grinding, polishing operations

1.10.9. H 2 S, VOC emissions

SCOPE

These BAT conclusions concern the industrial activities specified in Annex I to Directive 2010/75/EU, namely:

— 3.3. Manufacture of glass including glass fibre with a melting capacity exceeding 20 tonnes per day;

— 3.4. Melting mineral substances including the production of mineral fibres with a melting capacity exceeding 20 tonnes per day.

These BAT conclusions do not address the following activities:

— Production of water glass, covered by the reference document Large Volume Inorganic Chemicals – Solids and Other Industry (LVIC-S)

— Production of polycrystalline wool

— Production of mirrors, covered by the reference document Surface Treatment Using Organic Solvents (STS)

Other reference documents which are of relevance for the activities covered by these BAT conclusions are the following:

Reference documents Activity Emissions from Storage (EFS) Storage and handling of raw materials Energy Efficiency (ENE) General energy efficiency Economic and Cross-Media Effects (ECM) Economics and cross-media effects of techniques General Principles of Monitoring (MON) Emissions and consumption monitoring

The techniques listed and described in these BAT conclusions are neither prescriptive nor exhaustive. Other techniques may be used that ensure at least an equivalent level of environmental protection.

DEFINITIONS

For the purposes of these BAT conclusions, the following definitions apply:

Term used Definition New plant A plant introduced on the site of the installation following the publication of these BAT conclusions or a complete replacement of a plant on the existing foundations of the installation following the publication of these BAT conclusions Existing plant A plant which is not a new plant New furnace A furnace introduced on the site of the installation following the publication of these BAT conclusions or a complete rebuild of a furnace following the publication of these BAT conclusions Normal furnace rebuild A rebuild between campaigns without a significant change in furnace requirements or technology and in which the furnace frame is not significantly adjusted and the furnace dimensions remain basically unchanged. The refractory of the furnace and, where appropriate, the regenerators are repaired by the full or partial replacement of the material. Complete furnace rebuild A rebuild involving a major change in the furnace requirements or technology and with major adjustment or replacement of the furnace and associated equipments.

GENERAL CONSIDERATIONS

Averaging periods and reference conditions for air emissions

Unless stated otherwise, emission levels associated with the best available techniques (BAT-AELs) for air emissions given in these BAT conclusions apply under the reference conditions shown in Table 1. All values for concentrations in waste gases refer to standard conditions: dry gas, temperature 273,15 K, pressure 101,3 kPa.

For discontinuous measurements BAT-AELs refer to the average value of three spot samples of at least 30 minutes each; for regenerative furnaces the measuring period should cover a minimum of two firing reversals of the regenerator chambers For continuous measurements BAT-AELs refer to daily average values





Table 1

Reference conditions for BAT-AELs concerning air emissions

Activities Unit Reference conditions Melting activities Conventional melting furnace in continuous melters mg/Nm3 8 % oxygen by volume Conventional melting furnace in discontinuous melters mg/Nm3 13 % oxygen by volume Oxy-fuel-fired furnaces kg/tonne melted glass The expression of emission levels measured as mg/Nm3 to a reference oxygen concentration is not applicable Electric furnaces mg/Nm3 or kg/tonne melted glass The expression of emission levels measured as mg/Nm3 to a reference oxygen concentration is not applicable Frit melting furnaces mg/Nm3 or kg/tonne melted frit Concentrations refer to 15 % oxygen by volume. When air-gas firing is used, BAT AELs expressed as emission concentration (mg/Nm3) apply. When only oxy-fuel firing is employed, BAT AELs expressed as specific mass emissions (kg/tonne melted frit) apply. When oxygen-enriched air-fuel firing is used, BAT AELs expressed as either emission concentration (mg/Nm3) or as specific mass emissions (kg/tonne melted frit) apply All type of furnaces kg/tonne melted glass The specific mass emissions refer to 1 tonne of melted glass Non-melting activities, including downstream processes All processes mg/Nm3 No correction for oxygen All processes kg/tonne glass The specific mass emissions refer to 1 tonne of produced glass

Conversion to reference oxygen concentration

The formula for calculating the emissions concentration at a reference oxygen level (see Table 1) is shown below.

Where:

ER (mg/Nm3) : emissions concentration corrected to the reference oxygen level OR OR (vol %) : reference oxygen level EM (mg/Nm3) : emissions concentration referred to the measured oxygen level OM OM (vol %) : measured oxygen level.

Conversion from concentrations to specific mass emissions

BAT-AELs given in Sections 1.2 to 1.9 as specific mass emissions (kg/tonne melted glass) are based on the calculation reported below except for oxy-fuel fired furnaces and, in a limited number of cases, for electric melting where BAT-AELs given in kg/tonne melted glass were derived from specific reported data.

The calculation procedure used for the conversion from concentrations to specific mass emissions is shown below.

Specific mass emission (kg/tonne of melted glass) = conversion factor × emissions concentration (mg/Nm3)

Where: conversion factor = (Q/P) × 10–6

with Q = waste gas volume in Nm3/h P = pull rate in tonnes of melted glass/h.

The waste gas volume (Q) is determined by the specific energy consumption, type of fuel, and the oxidant (air, air enriched by oxygen and oxygen with purity depending on the production process). The energy consumption is a complex function of (predominantly) the type of furnace, the type of glass and the cullet percentage.

However, a range of factors can influence the relationship between concentration and specific mass flow, including:

— type of furnace (air preheating temperature, melting technique)

— type of glass produced (energy requirement for melting)

— energy mix (fossil fuel/electric boosting)

— type of fossil fuel (oil, gas)

— type of oxidant (oxygen, air, oxygen-enriched air)

— cullet percentage

— batch composition

— age of the furnace

— furnace size.

The conversion factors given in Table 2 have been used for converting BAT-AELs from concentrations into specific mass emissions.

The conversion factors have been determined on the basis of energy efficient furnaces and relate only to full air/fuel-fired furnaces.

Table 2

Indicative factors used for converting mg/Nm3 into kg/tonne of melted glass based on energy efficient fuel-air furnaces

Sectors Factors to convert mg/Nm3 into kg/tonne of melted glass Flat glass 2,5 × 10–3 Container glass General case 1,5 × 10–3 Specific cases (1) Case-by-case study (often 3,0 × 10–3) Continuous filament glass fibre 4,5 × 10–3 Domestic glass Soda lime 2,5 × 10–3 Specific cases (2) Case-by-case study (between 2,5 and > 10 × 10–3; often 3,0 × 10–3) Mineral wool Glass wool 2 × 10–3 Stone wool cupola 2,5 × 10–3 Special glass TV glass (panels) 3 × 10–3 TV glass (funnel) 2,5 × 10–3 Borosilicate (tube) 4 × 10–3 Glass ceramics 6,5 × 10–3 Lighting glass (soda-lime) 2,5 × 10–3 Frits Case-by-case study (between 5 – 7,5 × 10–3)

DEFINITIONS FOR CERTAIN AIR POLLUTANTS

For the purpose of these BAT conclusions and for the BAT-AELs reported in Sections 1.2 to 1.9, the following definitions apply:

NOX expressed as NO2 The sum of nitrogen oxide (NO) and nitrogen dioxide (NO2) expressed as NO2 SOX expressed as SO2 The sum of sulphur dioxide (SO2) and sulphur trioxide (SO3) expressed as SO2 Hydrogen chloride expressed as HCl All gaseous chlorides expressed as HCl Hydrogen fluoride expressed as HF All gaseous fluorides expressed as HF

AVERAGING PERIODS FOR WASTE WATER DISCHARGES

Unless stated otherwise, emission levels associated with the best available techniques (BAT-AELs) for waste water emissions given in these BAT conclusions refer to the average value of a composite sample taken over a period of 2 hours or 24 hours.

1.1. General BAT conclusions for the manufacture of glass

Unless otherwise stated, the BAT conclusions presented in this section can be applied to all installations.

The process-specific BAT included in Sections 1.2 – 1.9 apply in addition to the general BAT mentioned in this section.

1.1.1. Environmental management systems

1. BAT is to implement and adhere to an environmental management system (EMS) that incorporates all of the following features:

(i) commitment of the management, including senior management;

(ii) definition of an environmental policy that includes the continuous improvement for the installation by the management;

(iii) planning and establishing the necessary procedures, objectives and targets, in conjunction with financial planning and investment;

(iv) implementation of the procedures paying particular attention to: (a) structure and responsibility (b) training, awareness and competence (c) communication (d) employee involvement (e) documentation (f) efficient process control (g) maintenance programmes (h) emergency preparedness and response (i) safeguarding compliance with environmental legislation.

(v) checking performance and taking corrective action, paying particular attention to: (a) monitoring and measurement (see also the reference document on the General Principles of Monitoring) (b) corrective and preventive action (c) maintenance of records (d) independent (where practicable) internal or external auditing in order to determine whether or not the EMS conforms to planned arrangements and has been properly implemented and maintained;

(vi) review of the EMS and its continuing suitability, adequacy and effectiveness by senior management;

(vii) following the development of cleaner technologies;

(viii) consideration for the environmental impacts from the eventual decommissioning of the installation at the stage of designing a new plant, and throughout its operating life;

(ix) application of sectoral benchmarking on a regular basis.

Applicability

The scope (e.g. level of details) and nature of the EMS (e.g. standardised or non-standardised) will generally be related to the nature, scale and complexity of the installation, and the range of environmental impacts it may have.

1.1.2. Energy efficiency

2. BAT is to reduce the specific energy consumption by using one or a combination of the following techniques:

Technique Applicability (i) Process optimisation, through the control of the operating parameters The techniques are generally applicable (ii) Regular maintenance of the melting furnace (iii) Optimisation of the furnace design and the selection of the melting technique Applicable for new plants. For existing plants, the implementation requires a complete rebuild of the furnace (iv) Application of combustion control techniques Applicable to fuel/air and oxy-fuel fired furnaces (v) Use of increasing levels of cullet, where available and economically and technically viable Not applicable to the continuous filament glass fibre, high temperature insulation wool and frits sectors (vi) Use of a waste heat boiler for energy recovery, where technically and economically viable Applicable to fuel/air and oxy-fuel fired furnaces. The applicability and economic viability of the technique is dictated by the overall efficiency that may be obtained, including the effective use of the steam generated (vii) Use of batch and cullet preheating, where technically and economically viable Applicable to fuel/air and oxy-fuel fired furnaces. The applicability is normally restricted to batch compositions with more than 50 % cullet

1.1.3. Materials storage and handling

3. BAT is to prevent, or where that is not practicable, to reduce diffuse dust emissions from the storage and handling of solid materials by using one or a combination of the following techniques:

I. Storage of raw materials (i) Store bulk powder materials in enclosed silos equipped with a dust abatement system (e.g. fabric filter) (ii) Store fine materials in enclosed containers or sealed bags (iii) Store under cover stockpiles of coarse dusty materials (iv) Use of road cleaning vehicles and water damping techniques

II. Handling of raw materials Technique Applicability (i) For materials which are transported by above ground, use enclosed conveyors to prevent material loss The techniques are generally applicable (ii) Where pneumatic conveying is used, apply a sealed system equipped with a filter to clean the transport air before release (iii) Moistening of the batch The use of this technique is limited by the negative consequences on the furnace energy efficiency. Restrictions may apply to some batch formulations, in particular for borosilicate glass production (iv) Application of a slightly negative pressure within the furnace Applicable only as an inherent aspect of operation (i.e. melting furnaces for frits production) due to a detrimental impact on furnace energy efficiency (v) Use of raw materials that do not cause decrepitation phenomena (mainly dolomite and limestone). These phenomena consist of minerals that ‘crackle’ when exposed to heat, with a consequent potential increase of dust emissions Applicable within the constraints associated with the availability of raw materials (vi) Use of an extraction which vents to a filter system in processes where dust is likely to be generated (e.g. bag opening, frits batch mixing, fabric filter dust disposal, cold-top melters) The techniques are generally applicable (vii) Use of enclosed screw feeders (viii) Enclosure of feed pockets Generally applicable. Cooling may be necessary to avoid damage to the equipment

4. BAT is to prevent, or where that is not practicable, to reduce diffuse gaseous emissions from the storage and handling of volatile raw materials by using one or a combination of the following techniques:

(i) Use of tank paint with low solar absorbency for bulk storage subject to temperature changes due to solar heating.

(ii) Control of temperature in the storage of volatile raw materials.

(iii) Tank insulation in the storage of volatile raw materials.

(iv) Inventory management

(v) Use of floating roof tanks in the storage of large quantities of volatile petroleum products.

(vi) Use of vapour return transfer systems in the transfer of volatile fluids (e.g. from tank trucks to storage tank).

(vii) Use of bladder roof tanks in the storage of liquid raw materials.

(viii) Use of pressure/vacuum valves in tanks designed to withstand pressure fluctuations.

(ix) Application of a release treatment (e.g. adsorption, absorption, condensation) in the storage of hazardous materials.

(x) Application of subsurface filling in the storage of liquids that tend to foam.

1.1.4. General primary techniques

5. BAT is to reduce energy consumption and emissions to air by carrying out a constant monitoring of the operational parameters and a programmed maintenance of the melting furnace.

Technique Applicability The technique consists of a series of monitoring and maintenance operations which can be used individually or in combination appropriate to the type of furnace, with the aim of minimising the ageing effects on the furnace, such as sealing the furnace and burner blocks, keep the maximum insulation, control the stabilised flame conditions, control the fuel/air ratio, etc. Applicable to regenerative, recuperative, and oxy-fuel fired furnaces. The applicability to other types of furnaces requires an installation-specific assessment

6. BAT is to carry out a careful selection and control of all substances and raw materials entering the melting furnace in order to reduce or prevent emissions to air by using one or a combination of the following techniques.

Technique Applicability (i) Use of raw materials and external cullet with low levels of impurities (e.g. metals, chlorides, fluorides) Applicable within the constraints of the type of glass produced at the installation and the availability of raw materials and fuels (ii) Use of alternative raw materials (e.g. less volatile) (iii) Use of fuels with low metal impurities

7. BAT is to carry out monitoring of emissions and/or other relevant process parameters on a regular basis, including the following:

Technique Applicability (i) Continuous monitoring of critical process parameters to ensure process stability, e.g. temperature, fuel feed and airflow The techniques are generally applicable (ii) Regular monitoring of process parameters to prevent/reduce pollution, e.g. O2 content of the combustion gases to control the fuel/air ratio. (iii) Continuous measurements of dust, NOX and SO2 emissions or discontinuous measurements at least twice per year, associated with the control of surrogate parameters to ensure that the treatment system is working properly between measurements (iv) Continuous or regular periodic measurements of NH3 emissions, when selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR) techniques are applied The techniques are generally applicable (v) Continuous or regular periodic measurements of CO emissions when primary techniques or chemical reduction by fuel techniques are applied for NOX emissions reductions or partial combustion may occur. (vi) Regular periodic measurements of emissions of HCl, HF, CO and metals, in particular when raw materials containing such substances are used or partial combustion may occur The techniques are generally applicable (vii) Continuous monitoring of surrogate parameters to ensure that the waste gas treatment system is working properly and that the emission levels are maintained between discontinuous measurements. The monitoring of surrogate parameters includes: reagent feed, temperature, water feed, voltage, dust removal, fan speed, etc.

8. BAT is to operate the waste gas treatment systems during normal operating conditions at optimal capacity and availability in order to prevent or reduce emissions

Applicability

Special procedures can be defined for specific operating conditions, in particular:

(i) during start-up and shutdown operations

(ii) during other special operations which could affect the proper functioning of the systems (e.g. regular and extraordinary maintenance work and cleaning operations of the furnace and/or of the waste gas treatment system, or severe production change)

(iii) in the case of insufficient waste gas flow or temperature which prevents the use of the system at full capacity.

9. BAT is to limit carbon monoxide (CO) emissions from the melting furnace, when applying primary techniques or chemical reduction by fuel, for the reduction of NOX emissions

Technique Applicability Primary techniques for the reduction of NOX emissions are based on combustion modifications (e.g. reduction of air/fuel ratio, staged combustion low-NOX burners, etc.). Chemical reduction by fuel consists of the addition of hydrocarbon fuel to the waste gas stream to reduce the NOX formed in the furnace. The increase in CO emissions due to the application of these techniques can be limited by a careful control of the operational parameters Applicable to conventional air/fuel fired furnaces.





Table 3

BAT-AELs for carbon monoxide emissions from melting furnaces

Parameter BAT-AEL Carbon monoxide, expressed as CO < 100 mg/Nm3

10. BAT is to limit ammonia (NH3) emissions, when applying selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR) techniques for a high efficiency NOX emissions reduction

Technique Applicability The technique consists of adopting and maintaining suitable operating conditions of the SCR or SNCR waste gas treatment systems, with the aim of limiting emissions of unreacted ammonia Applicable to melting furnaces fitted with SCR or SNCR





Table 4

BAT-AELs for ammonia emissions, when SCR or SNCR techniques are applied

Parameter BAT-AELs (3) Ammonia, expressed as NH3 < 5 – 30 mg/Nm3

11. BAT is to reduce boron emissions from the melting furnace, when boron compounds are used in the batch formulation, by using one or a combination of the following techniques:

Technique (4) Applicability (i) Operation of a filtration system at a suitable temperature for enhancing the separation of boron compounds in the solid state, taking into account that some boric acid species may be present in the flue-gas as gaseous compounds at temperatures below 200 °C, but also as low as 60 °C The applicability to existing plants may be limited by technical constraints associated with the position and characteristics of the existing filter system (ii) Use of dry or semi-dry scrubbing in combination with a filtration system The applicability may be limited by a decreased removal efficiency of other gaseous pollutants (SOX, HCl, HF) caused by the deposition of boron compounds on the surface of the dry alkaline reagent (iii) Use of wet scrubbing The applicability to existing plants may be limited by the need of a specific waste water treatment

Monitoring

The monitoring of boron emissions should be carried out according to a specific methodology which allows measurement of both solid and gaseous forms and to determine the effective removal of these species from the flue gases.

1.1.5. Emissions to water from glass manufacturing processes

12. BAT is to reduce water consumption by using one or a combination of the following techniques:

Technique Applicability (i) Minimisation of spillages and leaks The technique is generally applicable (ii) Reuse of cooling and cleaning waters after purging The technique is generally applicable. Recirculation of scrubbing water is applicable to most scrubbing systems; however, periodic discharge and replacement of the scrubbing medium may be necessary (iii) Operate a quasi-closed loop water system as far as technically and economically feasible The applicability of this technique may be limited by the constraints associated with the safety management of the production process. In particular: — open circuit cooling may be used when safety issues require for it (e.g. incidents when large quantities of glass need to be cooled) — water used in some specific process (e.g. downstream activities in the continuous filament glass fibre sector, acid polishing in the domestic and special glass sectors, etc.) may have to be discharged in total or in part to the waste water treatment system

13. BAT is to reduce the emission load of pollutants in the waste water discharges by using one or a combination of the following waste water treatment systems:

Technique Applicability (i) Standard pollution control techniques, such as settlement, screening, skimming, neutralisation, filtration, aeration, precipitation, coagulation and flocculation, etc. Standard good practice techniques to control emissions from storage of liquid raw materials and intermediates, such as containments, inspection/testing of tanks, overfill protection, etc. The techniques are generally applicable (ii) Biological treatment systems, such as activated sludge, biofiltration to remove/degrade the organic compounds The applicability is limited to the sectors which use organic substances in the production process (e.g. continuous filament glass fibre and mineral wool sectors) (iii) Discharge to municipal waste water treatment Plants Applicable to installations where further reduction of pollutants is necessary (iv) External reuse of waste waters The applicability is generally limited to the frits sector (possible reuse in the ceramic industry)





Table 5

BAT-AELs for waste water discharges to surface waters from the manufacture of glass

Parameter (5) Unit BAT-AEL (6) (composite sample) pH — 6,5 – 9 Total suspended solids mg/l < 30 Chemical oxygen demand (COD) mg/l < 5 – 130 (7) Sulphates, expressed as SO4 2– mg/l < 1 000 Fluorides, expressed as F– mg/l < 6 (8) Total hydrocarbons mg/l < 15 (9) Lead, expressed as Pb mg/l < 0,05 – 0,3 (10) Antimony, expressed as Sb mg/l < 0,5 Arsenic, expressed as As mg/l < 0,3 Barium, expressed as Ba mg/l < 3,0 Zinc, expressed as Zn mg/l < 0,5 Copper, expressed as Cu mg/l < 0,3 Chromium, expressed as Cr mg/l < 0,3 Cadmium, expressed as Cd mg/l < 0,05 Tin, expressed as Sn mg/l < 0,5 Nickel, expressed as Ni mg/l < 0,5 Ammonia, expressed as NH4 mg/l < 10 Boron, expressed as B mg/l < 1 – 3 Phenol mg/l < 1

1.1.6. Waste from the glass manufacturing processes

14. BAT is to reduce the production of solid waste to be disposed of by using one or a combination of the following techniques:

Technique Applicability (i) Recycling of waste batch materials, where quality requirements allow for it The applicability may be limited by the constraints associated with the quality of the final glass product (ii) Minimising material losses during the storage and handling of raw materials The technique is generally applicable (iii) Recycling of internal cullet from rejected production Generally, not applicable to the continuous filament glass fibre, high temperature insulation wool and frits sectors (iv) Recycling of dust in the batch formulation where quality requirements allow for it The applicability may be limited by different factors: — quality requirements of the final glass product — cullet percentage used in the batch formulation — potential carryover phenomena and corrosion of the refractory materials — sulphur balance constraints (v) Valorisation of solid waste and/or sludge through appropriate use on-site (e.g. sludge from water treatment) or in other industries Generally applicable to the domestic glass sector (for lead crystal cutting sludge) and to the container glass sector (fine particles of glass mixed with oil). Limited applicability to other glass manufacturing sectors due to unpredictable, contaminated composition, low volumes and economic viability (vi) Valorisation of end-of-life refractory materials for possible use in other industries The applicability is limited by the constraints imposed by the refractory manufacturers and potential end-users (vii) Applying cement bonded briquetting of waste for recycling into hot blast cupola furnaces where quality requirements allow for it The applicability of cement bonded briquetting of waste is limited to the stone wool sector. A trade-off approach between air emissions and the generation of solid waste stream should be undertaken

1.1.7. Noise from the glass manufacturing processes

15. BAT is to reduce noise emissions by using one or a combination of the following techniques:

(i) Make an environmental noise assessment and formulate a noise management plan as appropriate to the local environment

(ii) Enclose noisy equipment/operation in a separate structure/unit

(iii) Use embankments to screen the source of noise

(iv) Carry out noisy outdoor activities during the day

(v) Use noise protection walls or natural barriers (trees, bushes) between the installation and the protected area, on the basis of local conditions.

1.2. BAT conclusions for container glass manufacturing

Unless otherwise stated, the BAT conclusions presented in this section can be applied to all container glass manufacturing installations.

1.2.1. Dust emissions from melting furnaces

16. BAT is to reduce dust emissions from the waste gases of the melting furnace by applying a flue-gas cleaning system such as an electrostatic precipitator or a bag filter.

Technique (11) Applicability The flue-gas cleaning systems consist of end-of-pipe techniques based on the filtration of all materials that are solid at the point of measurement The technique is generally applicable





Table 6

BAT-AELs for dust emissions from the melting furnace in the container glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (12) Dust < 10 – 20 < 0,015 – 0,06

1.2.2. Nitrogen oxides (NOX) from melting furnaces

17. BAT is to reduce NOX emissions from the melting furnace by using one or a combination of the following techniques:

I. primary techniques, such as: Technique (13) Applicability (i) Combustion modifications (a) Reduction of air/fuel ratio Applicable to air/fuel conventional furnaces. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (b) Reduced combustion air temperature Applicable only under installation-specific circumstances due to a lower furnace efficiency and higher fuel demand (i.e. use of recuperative furnaces in place of regenerative furnaces) (c) Staged combustion: — Air staging — Fuel staging Fuel staging is applicable to most conventional air/fuel furnaces. Air staging has very limited applicability due to its technical complexity (d) Flue-gas recirculation The applicability of this technique is limited to the use of special burners with automatic recirculation of the waste gas (e) Low-NOX burners The technique is generally applicable. The achieved environmental benefits are generally lower for applications to cross-fired, gas-fired furnaces due to technical constraints and a lower degree of flexibility of the furnace. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (f) Fuel choice The applicability is limited by the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State (ii) Special furnace design The applicability is limited to batch formulations that contain high levels of external cullet (> 70 %). The application requires a complete rebuild of the melting furnace. The shape of the furnace (long and narrow) may pose space restrictions (iii) Electric melting Not applicable for large volume glass productions (> 300 tonnes/day). Not applicable for productions requiring large pull variations. The implementation requires a complete furnace rebuild (iv) Oxy-fuel melting The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild

II. secondary techniques, such as: Technique (14) Applicability (i) Selective catalytic reduction (SCR) The application may require an upgrade of the dust abatement system in order to guarantee a dust concentration of below 10 – 15 mg/Nm3 and a desulphurisation system for the removal of SOX emissions. Due to the optimum operating temperature window, the applicability is limited to the use of electrostatic precipitators. In general, the technique is not used with a bag filter system because the low operating temperature, in the range of 180 – 200 °C, would require reheating of the waste gases. The implementation of the technique may require significant space availability (ii) Selective non-catalytic reduction(SNCR) The technique is applicable to recuperative furnaces. Very limited applicability to conventional regenerative furnaces, where the correct temperature window is difficult to access or does not allow a good mixing of the flue-gases with the reagent. It may be applicable to new regenerative furnaces equipped with split regenerators; however, the temperature window is difficult to maintain due to the reversal of fire between the chambers that causes a cyclical temperature change

Table 7

BAT-AELs for NOX emissions from the melting furnace in the container glass sector

Parameter BAT BAT-AEL mg/Nm3 kg/tonne melted glass (15) NOX expressed as NO2 Combustion modifications, special furnace designs (16) (17) 500 – 800 0,75 – 1,2 Electric melting < 100 < 0,3 Oxy-fuel melting (18) Not applicable < 0,5 – 0,8 Secondary techniques < 500 < 0,75

18. When nitrates are used in the batch formulation and/or special oxidising combustion conditions are required in the melting furnace for ensuring the quality of the final product, BAT is to reduce NOX emissions by minimising the use of these raw materials, in combination with primary or secondary techniques

The BAT-AELs are set out in Table 7.

If nitrates are used in the batch formulation for short campaigns or for melting furnaces with a capacity of < 100 t/day, the BAT-AEL is set out in Table 8.

Technique (19) Applicability Primary techniques: — Minimising the use of nitrates in the batch formulation The use of nitrates is applied for very high quality products (i.e. flacconage, perfume bottles and cosmetic containers). Effective alternative materials are sulphates, arsenic oxides, cerium oxide. The application of process modifications (e.g. special oxidising combustion conditions) represents an alternative to the use of nitrates The substitution of nitrates in the batch formulation may be limited by the high costs and/or higher environmental impact of the alternative materials





Table 8

BAT-AEL for NOX emissions from the melting furnace in the container glass sector, when nitrates are used in the batch formulation and/or special oxidising combustion conditions in cases of short campaigns or for melting furnaces with a capacity of < 100 t/day

Parameter BAT BAT-AEL mg/Nm3 kg/tonne melted glass (20) NOX expressed as NO2 Primary techniques < 1 000 < 3

1.2.3. Sulphur oxides (SOX) from melting furnaces

19. BAT is to reduce SOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (21) Applicability (i) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable (ii) Minimisation of the sulphur content in the batch formulation and optimisation of the sulphur balance The minimisation of the sulphur content in the batch formulation is generally applicable within the constraints of quality requirements of the final glass product. The application of sulphur balance optimisation requires a trade-off approach between the removal of SOX emissions and the management of the solid waste (filter dust). The effective reduction of SOX emissions depends on the retention of sulphur compounds in the glass which may vary significantly depending on the glass type (iii) Use of low sulphur content fuels The applicability may be limited by the constraints associated with the availability of low sulphur fuels, which may be impacted by the energy policy of the Member State





Table 9

BAT-AELs for SOX emissions from the melting furnace in the container glass sector

Parameter Fuel BAT-AEL (22) (23) mg/Nm3 kg/tonne melted glass (24) SOX expressed as SO2 Natural gas < 200 – 500 < 0,3 – 0,75 Fuel oil (25) < 500 – 1 200 < 0,75 – 1,8

1.2.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

20. BAT is to reduce HCl and HF emissions from the melting furnace (possibly combined with flue-gases from hot-end coating activities) by using one or a combination of the following techniques:

Technique (26) Applicability (i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine The applicability may be limited by the constraints of the type of glass produced at the installation and the availability of raw materials (ii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable





Table 10

BAT-AELs for HCl and HF emissions from the melting furnace in the container glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (27) Hydrogen chloride, expressed as HCl (28) < 10 – 20 < 0,02 – 0,03 Hydrogen fluoride, expressed as HF < 1 – 5 < 0,001 – 0,008

1.2.5. Metals from melting furnaces

21. BAT is to reduce metal emissions from the melting furnace by using one or a combination of the following techniques:

Technique (29) Applicability (i) Selection of raw materials for the batch formulation with a low content of metals The applicability may be limited by the constraints imposed by the type of glass produced at the installation and the availability of the raw materials (ii) Minimising the use of metal compounds in the batch formulation, where colouring and decolourising of glass is needed, subject to consumer glass quality requirements (iii) Applying a filtration system (bag filter or electrostatic precipitator) The techniques are generally applicable (iv) Applying a dry or semi-dry scrubbing, in combination with a filtration system





Table 11

BAT-AELs for metal emissions from the melting furnace in the container glass sector

Parameter BAT-AEL (30) (31) (32) mg/Nm3 kg/tonne melted glass (33) Σ (As, Co, Ni, Cd, Se, CrVI) < 0,2 – 1 (34) < 0,3 – 1,5 × 10–3 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) < 1 – 5 < 1,5 – 7,5 × 10–3

1.2.6. Emissions from downstream processes

22. When tin, organotin or titanium compounds are used for hot-end coating operations, BAT is to reduce emissions by using one or a combination of the following techniques:

Technique Applicability (i) Minimising the losses of the coating product by ensuring a good sealing of the application system and applying an effective extracting hood. A good construction and sealing of the application system is essential for minimising losses of unreacted product into the air The technique is generally applicable (ii) Combining the flue-gas from the coating operations with the waste gas from the melting furnace or with the combustion air of the furnace, when a secondary treatment system is applied (filter and dry or semi-dry scrubber). Based on the chemical compatibility, the waste gases from the coating operations may be combined with other flue-gases before treatment. These two options may be applied: — combination with the flue gases from the melting furnace, upstream of a secondary abatement system (dry or semi-dry scrubbing plus filtration system) — combination with combustion air before entering the regenerator, followed by secondary abatement treatment of the waste gases generated during the melting process (dry or semi-dry scrubbing + filtration system) The combination with flue gases from the melting furnace is generally applicable. The combination with combustion air may be affected by technical constraints due to some potential effects on the glass chemistry and on the regenerator materials (iii) Applying a secondary technique, e.g. wet scrubbing, dry scrubbing plus filtration (35) The techniques are generally applicable





Table 12

BAT-AELs for air emissions from hot-end coating activities in the container glass sector when the flue-gases from downstream operations are treated separately

Parameter BAT-AEL mg/Nm3 Dust < 10 Titanium compounds expressed as Ti < 5 Tin compounds, including organotin, expressed as Sn < 5 Hydrogen chloride, expressed as HCl < 30

23. When SO3 is used for surface treatment operations, BAT is to reduce SOX emissions by using one or a combination of the following techniques:

Technique (36) Applicability (i) Minimising the product losses by ensuring a good sealing of the application system A good construction and maintenance of the application system is essential for minimising the losses of unreacted product into the air The techniques are generally applicable (ii) Applying a secondary technique, e.g. wet scrubbing





Table 13

BAT-AEL for SOX emissions from downstream activities when SO3 is used for surface treatment operations in the container glass sector, when treated separately

Parameter BAT-AEL mg/Nm3 SOx, expressed as SO2 < 100 – 200

1.3. BAT conclusions for flat glass manufacturing

Unless otherwise stated, the BAT conclusions presented in this section can be applied to all flat glass manufacturing installations.

1.3.1. Dust emissions from melting furnaces

24. BAT is to reduce dust emissions from the waste gases of the melting furnace by applying an electrostatic precipitator or a bag filter system

A description of the techniques is given in Section 1.10.1.

Table 14

BAT-AELs for dust emissions from the melting furnace in the flat glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (37) Dust < 10 – 20 < 0,025 – 0,05

1.3.2. Nitrogen oxides (NOX) from melting furnaces

25. BAT is to reduce NOX emissions from the melting furnace by using one or a combination of the following techniques:

I. primary techniques, such as: Technique (38) Applicability (i) Combustion modifications (a) Reduction of air/fuel ratio Applicable to air/fuel conventional furnaces. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (b) Reduced combustion air temperature The applicability is restricted to small capacity furnaces for the production of specialty flat glass and under installation-specific circumstances, due to a lower furnace efficiency and higher fuel demand (i.e. use of recuperative furnaces in place of regenerative furnaces) (c) Staged combustion: — Air staging — Fuel staging Fuel staging is applicable to most conventional air/fuel furnaces. Air staging has very limited applicability due to its technical complexity (d) Flue-gas recirculation The applicability of this technique is limited to the use of special burners with automatic recirculation of the waste gas (e) Low-NOX burners The technique is generally applicable. The achieved environmental benefits are generally lower for applications to cross-fired, gas-fired furnaces due to technical constraints and a lower degree of flexibility of the furnace. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (f) Fuel choice The applicability is limited by the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State (ii) Fenix process Based on the combination of a number of primary techniques for the optimisation of the combustion of cross-fired regenerative float furnaces. The main features are: — reduction of excess air — suppression of hotspots and homogenisation of the flame temperatures — controlled mixing of the fuel and combustion air The applicability is limited to cross-fired regenerative furnaces. Applicable to new furnaces. For existing furnaces, the technique requires being directly integrated during the design and construction of the furnace, at a complete furnace rebuild (iii) Oxy-fuel melting The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild

II. secondary techniques, such as: Technique (39) Applicability (i) Chemical reduction by fuel Applicable to regenerative furnaces. The applicability is limited by an increased fuel consumption and consequent environmental and economic impact (ii) Selective catalytic reduction (SCR) The application may require an upgrade of the dust abatement system in order to guarantee a dust concentration of below 10 – 15 mg/Nm3 and a desulphurisation system for the removal of SOX emissions Due to the optimum operating temperature window, the applicability is limited to the use of electrostatic precipitators. In general, the technique is not used with a bag filter system because the low operating temperature, in the range of 180 – 200 °C, would require reheating of the waste gases. The implementation of the technique may require significant space availability

Table 15

BAT-AELs for NOX emissions from the melting furnace in the flat glass sector

Parameter BAT BAT-AEL (40) mg/Nm3 kg/tonne melted glass (41) NOX expressed as NO2 Combustion modifications, Fenix process (42) 700 – 800 1,75 – 2,0 Oxy-fuel melting (43) Not applicable < 1,25 – 2,0 Secondary techniques (44) 400 – 700 1,0 – 1,75

26. When nitrates are used in the batch formulation, BAT is to reduce NOX emissions by minimising the use of these raw materials, in combination with primary or secondary techniques. If secondary techniques are applied, the BAT-AELs reported in Table 15 are applicable.

If nitrates are used in the batch formulation for the production of special glasses in a limited number of short campaigns, the BAT-AELs are set out in Table 16.

Technique (45) Applicability Primary techniques: minimising the use of nitrates in the batch formulation The use of nitrates is applied for special productions (i.e. coloured glass). Effective alternative materials are sulphates, arsenic oxides, cerium oxide The substitution of nitrates in the batch formulation may be limited by the high costs and/or higher environmental impact of the alternative materials





Table 16

BAT-AEL for NOX emissions from the melting furnace in the flat glass sector, when nitrates are used in the batch formulation for the production of special glasses in a limited number of short campaigns

Parameter BAT BAT-AEL mg/Nm3 kg/tonne melted glass (46) NOX expressed as NO2 Primary techniques < 1 200 < 3

1.3.3. Sulphur oxides (SOX) from melting furnaces

27. BAT is to reduce SOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (47) Applicability (i) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable (ii) Minimisation of the sulphur content in the batch formulation and optimisation of the sulphur balance The minimisation of the sulphur content in the batch formulation is generally applicable within the constraints of quality requirements of the final glass product. The application of sulphur balance optimisation requires a trade-off approach between the removal of SOX emissions and the management of the solid waste (filter dust) (iii) Use of low sulphur content fuels The applicability may be limited by the constraints associated with the availability of low sulphur fuels, which may be impacted by the energy policy of the Member State





Table 17

BAT-AELs for SOX emissions from the melting furnace in the flat glass sector

Parameter Fuel BAT-AEL (48) mg/Nm3 kg/tonne melted glass (49) SOx expressedas SO2 Natural gas < 300 – 500 < 0,75 – 1,25 Fuel oil (50) (51) 500 – 1 300 1,25 – 3,25

1.3.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

28. BAT is to reduce HCl and HF emissions from the melting furnace by using one or a combination of the following techniques:

Technique (52) Applicability (i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine The applicability may be limited by the constraints of the type of glass produced at the installation and the availability of raw materials (ii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable





Table 18

BAT-AELs for HCl and HF emissions from the melting furnace in the flat glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (53) Hydrogen chloride, expressed as HCl (54) < 10 – 25 < 0,025 – 0,0625 Hydrogen fluoride, expressed as HF < 1 – 4 < 0,0025 – 0,010

1.3.5. Metals from melting furnaces

29. BAT is to reduce metal emissions from the melting furnace by using one or a combination of the following techniques:

Technique (55) Applicability (i) Selection of raw materials for the batch formulation with a low content of metals The applicability may be limited by the constraints imposed by the type of glass produced at the installation and the availability of the raw materials. (ii) Applying a filtration system The technique is generally applicable (iii) Applying a dry or semi-dry scrubbing, in combination with a filtration system





Table 19

BAT-AELs for metal emissions from the melting furnace in the flat glass sector, with the exception of selenium coloured glasses

Parameter BAT-AEL (56) mg/Nm3 kg/tonne melted glass (57) Σ (As, Co, Ni, Cd, Se, CrVI) < 0,2 – 1 < 0,5 – 2,5 × 10–3 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) < 1 – 5 < 2,5 – 12,5 × 10–3

30. When selenium compounds are used for colouring the glass, BAT is to reduce selenium emissions from the melting furnace by using one or a combination of the following techniques:

Technique (58) Applicability (i) Minimising the evaporation of selenium from the batch composition by selecting raw materials with a higher retention efficiency in the glass and reduced volatilisation The applicability may be limited by the constraints imposed by the type of glass produced at the installation and the availability of the raw materials (ii) Applying a filtration system The technique is generally applicable (iii) Applying a dry or semi-dry scrubbing, in combination with a filtration system





Table 20

BAT-AELs for selenium emissions from the melting furnace in the flat glass sector for the production of coloured glass

Parameter BAT-AEL (59) (60) mg/Nm3 kg/tonne melted glass (61) Selenium compounds, expressed as Se 1 – 3 2,5 – 7,5 × 10–3

1.3.6. Emissions from downstream processes

31. BAT is to reduce emissions to air from the downstream processes by using one or a combination of the following techniques:

Technique (62) Applicability (i) Minimising the losses of coating products applied to the flat glass by ensuring a good sealing of the application system The techniques are generally applicable (ii) Minimising the losses of SO2 from the annealing lehr, by operating the control system in an optimum manner (iii) Combining the SO2 emissions from the lehr with the waste gas from the melting furnace, when technically feasible, and where a secondary treatment system is applied (filter and dry or semi-dry scrubber) (iv) Applying a secondary technique, e.g. wet scrubbing, or dry scrubbing and filtration The techniques are generally applicable. The selection of the technique and its performance will depend on the inlet waste gas composition





Table 21

BAT-AELs for air emissions from downstream processes in the flat glass sector, when treated separately

Parameter BAT-AEL mg/Nm3 Dust < 15 – 20 Hydrogen chloride, expressed as HCl < 10 Hydrogen fluoride, expressed as HF < 1 – 5 SOX, expressed as SO2 < 200 Σ (As, Co, Ni, Cd, Se, CrVI) < 1 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) < 5

1.4. BAT conclusions for continuous filament glass fibre manufacturing

Unless otherwise stated, the BAT conclusions presented in this section can be applied to all continuous filament glass fibre manufacturing installations.

1.4.1. Dust emissions from melting furnaces

The BAT-AELs reported in this section for dust refer to all materials that are solid at the point of measurement, including solid boron compounds. Gaseous boron compounds at the point of measurement are not included.

32. BAT is to reduce dust emissions from the waste gases of the melting furnace by using one or a combination of the following techniques:

Technique (63) Applicability (i) Reduction of the volatile components by raw material modifications The formulation of batch compositions without boron compounds or with low levels of boron is a primary measure for reducing dust emissions which are mainly generated by volatilisation phenomena. Boron is the main constituent of particulate matter emitted from the melting furnace The application of the technique is limited by proprietary issues, since the boron-free or low-boron batch formulations are covered by a patent (ii) Filtration system: electrostatic precipitator or bag filter The technique is generally applicable. The maximum environmental benefits are achieved for applications on new plants where the positioning and characteristics of the filter may be decided without restrictions (iii) Wet scrubbing system The application to existing plants may be limited by technical constraints; i.e. need for a specific waste water treatment plant





Table 22

BAT-AELs for dust emissions from the melting furnace in the continuous filament glass fibre sector

Parameter BAT-AEL (64) mg/Nm3 kg/tonne melted glass (65) Dust < 10 – 20 < 0,045 – 0,09

1.4.2. Nitrogen oxides (NOX) from melting furnaces

33. BAT is to reduce NOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (66) Applicability (i) Combustion modifications (a) Reduction of air/fuel ratio Applicable to air/fuel conventional furnaces. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (b) Reduced combustion air temperature Applicable to air/fuel conventional furnaces within the constraints of the furnace energy efficiency and higher fuel demand. Most furnaces are already of the recuperative type. (c) Staged combustion: (d) Air staging (e) Fuel staging Fuel staging is applicable to most air/fuel, oxy-fuel furnaces. Air staging has very limited applicability due to its technical complexity (d) Flue-gas recirculation The applicability of this technique is limited to the use of special burners with automatic recirculation of the waste gas (e) Low-NOX burners The technique is generally applicable. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (f) Fuel choice The applicability is limited by the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State (ii) Oxy-fuel melting The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild





Table 23

BAT-AELs for NOX emissions from the melting furnace in the continuous filament glass fibre sector

Parameter BAT BAT-AEL mg/Nm3 kg/tonne melted glass NOX expressed as NO2 Combustion modifications < 600 – 1 000 < 2,7 – 4,5 (67) Oxy-fuel melting (68) Not applicable < 0,5 – 1,5

1.4.3. Sulphur oxides (SOX) from melting furnaces

34. BAT is to reduce SOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (69) Applicability (i) Minimisation of the sulphur content in the batch formulation and optimisation of the sulphur balance The technique is generally applicable within the constraints of quality requirements of the final glass product. The application of sulphur balance optimisation requires a trade-off approach between the removal of SOX emissions and the management of the solid waste (filter dust), which needs to be disposed of (ii) Use of low sulphur content fuels The applicability may be limited by the constraints associated with the availability of low sulphur fuels, which may be impacted by the energy policy of the Member State (iii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable. The presence of high concentrations of boron compounds in the flue-gases may limit the abatement efficiency of the reagent used in the dry or semi-dry scrubbing systems (iv) Use of wet scrubbing The technique is generally applicable within technical constraints; i.e. need for a specific waste water treatment plant





Table 24

BAT-AELs for SOX emissions from the melting furnace in the continuous filament glass fibre sector

Parameter Fuel BAT-AEL (70) mg/Nm3 kg/tonne melted glass (71) SOx expressed as SO2 Natural gas (72) < 200 – 800 < 0,9 – 3,6 Fuel oil (73) (74) < 500 – 1 000 < 2,25 – 4,5

1.4.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

35. BAT is to reduce HCl and HF emissions from the melting furnace by using one or a combination of the following techniques:

Technique (75) Applicability (i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine The technique is generally applicable within the constraints of the batch formulation and the availability of raw materials (ii) Minimisation of the fluorine content in the batch formulation The minimisation of fluorine emissions from the melting process may be achieved as follows: — minimising/reducing the quantity of fluorine compounds (e.g. fluorspar) used in the batch formulation to the minimum commensurate with the quality of the final product. Fluorine compounds are used to optimise the melting process, help fiberisation and minimise filament breakage — substituting fluorine compounds with alternative materials (e.g. sulphates) The substitution of fluorine compounds with alternative materials is limited by quality requirements of the product (iii) dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable (iv) wet scrubbing The technique is generally applicable within technical constraints; i.e. need for a specific waste water treatment plant.





Table 25

BAT-AELs for HCl and HF emissions from the melting furnace in the continuous filament glass fibre sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (76) Hydrogen chloride, expressed as HCl < 10 < 0,05 Hydrogen fluoride, expressed as HF (77) < 5 – 15 < 0,02 – 0,07

1.4.5. Metals from melting furnaces

36. BAT is to reduce metal emissions from the melting furnace by using one or a combination of the following techniques:

Technique (78) Applicability (i) Selection of raw materials for the batch formulation with a low content of metals The technique is generally applicable within the constraints of the availability of raw materials (ii) Applying a dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable (iii) Applying wet scrubbing The technique is generally applicable within technical constraints; i.e. need for a specific waste water treatment plant.





Table 26

BAT-AELs for metal emissions from the melting furnace in the continuous filament glass fibre sector

Parameter BAT-AEL (79) mg/Nm3 kg/tonne melted glass (80) Σ (As, Co, Ni, Cd, Se, CrVI) < 0,2 – 1 < 0,9 – 4,5 × 10–3 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) < 1 – 3 < 4,5 – 13,5 × 10–3

1.4.6. Emissions from downstream processes

37. BAT is to reduce emissions from downstream processes by using one or a combination of the following techniques:

Technique (81) Applicability (i) Wet scrubbing systems The techniques are generally applicable for the treatment of waste gases from the forming process (application of the coating to the fibres) or secondary processes which involve the use of binder that must be cured or dried (ii) Wet electrostatic precipitator (iii) Filtration system (bag filter) The technique is generally applicable for the treatment of waste gases from cutting and milling operations of the products





Table 27

BAT-AELs for air emissions from downstream processes in the continuous filament glass fibre sector, when treated separately

Parameter BAT-AEL mg/Nm3 Emissions from forming and coating Dust < 5 – 20 Formaldehyde < 10 Ammonia < 30 Total volatile organic compounds, expressed as C < 20 Emissions from cutting and milling Dust < 5 – 20

1.5. BAT conclusions for domestic glass manufacturing

Unless otherwise stated, the BAT conclusions presented in this section can be applied to all domestic glass manufacturing installations.

1.5.1. Dust emissions from melting furnaces

38. BAT is to reduce dust emissions from the waste gases of the melting furnace by using one or a combination of the following techniques:

Technique (82) Applicability (i) Reduction of the volatile components by raw material modifications. The formulation of the batch composition may contain very volatile components (e.g. boron, fluorides) which significantly contribute to the formation of dust emissions from the melting furnace The technique is generally applicable within the constraints of the type of glass produced and the availability of substitute raw materials (ii) Electric melting Not applicable for large volume glass productions (> 300 tonnes/day). Not applicable for productions requiring large pull variations The implementation requires a complete furnace rebuild (iii) Oxy-fuel melting The maximum environmental benefits are achieved for applications made at the time of a complete furnace rebuild (iv) Filtration system: electrostatic precipitator or bag filter The techniques are generally applicable (v) Wet scrubbing system The applicability is limited to specific cases, in particular to electric melting furnaces, where flue-gas volumes and dust emissions are generally low and related to carryover of the batch formulation





Table 28

BAT-AELs for dust emissions from the melting furnace in the domestic glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (83) Dust < 10 – 20 (84) < 0,03 – 0,06 < 1 – 10 (85) < 0,003 – 0,03

1.5.2. Nitrogen oxides (NOX) from melting furnaces

39. BAT is to reduce NOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (86) Applicability (i) Combustion modifications (a) Reduction of air/fuel ratio Applicable to air/fuel conventional furnaces. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (b) Reduced combustion air temperature Applicable only under installation-specific circumstances due to a lower furnace efficiency and higher fuel demand (i.e. use of recuperative furnaces in place of regenerative furnaces) (c) Staged combustion: (f) Air staging (g) Fuel staging Fuel staging is applicable to most conventional air/fuel furnaces. Air staging has very limited applicability due to its technical complexity (d) Flue-gas recirculation The applicability of this technique is limited to the use of special burners with automatic recirculation of the waste gas (e) Low-NOX burners The technique is generally applicable. The achieved environmental benefits are generally lower for applications to cross-fired, gas-fired furnaces due to technical constraints and a lower degree of flexibility of the furnace. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (f) Fuel choice The applicability is limited by the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State (ii) Special furnace design The applicability is limited to batch formulations that contain high levels of external cullet (> 70 %). The application requires a complete rebuild of the melting furnace. The shape of the furnace (long and narrow) may pose space restrictions (iii) Electric melting Not applicable for large volume glass productions (> 300 tonnes/day). Not applicable for productions requiring large pull variations. The implementation requires a complete furnace rebuild (iv) Oxy-fuel melting The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild





Table 29

BAT-AELs for NOX emissions from the melting furnace in the domestic glass sector

Parameter BAT BAT-AEL mg/Nm3 kg/tonne melted glass (87) NOx expressed as NO2 Combustion modifications, special furnace designs < 500 – 1 000 < 1,25 – 2,5 Electric melting < 100 < 0,3 Oxy-fuel melting (88) Not applicable < 0,5 – 1,5

40. When nitrates are used in the batch formulation, BAT is to reduce NOX emissions by minimising the use of these raw materials, in combination with primary or secondary techniques.

The BAT-AELs are set out in Table 29.

If nitrates are used in the batch formulation for a limited number of short campaigns or for melting furnaces with a capacity < 100 t/day producing special types of soda-lime glasses (clear/ultra-clear glass or coloured glass using selenium) and other special glasses (i.e. borosilicate, glass ceramics, opal glass, crystal and lead crystal), the BAT-AELs are set out in Table 30.

Technique (89) Applicability Primary techniques: — Minimising the use of nitrates in the batch formulation The use of nitrates is applied for very high quality products, where a very colourless (clear) glass is required or special glasses are produced. Effective alternative materials are sulphates, arsenic oxides, cerium oxide The substitution of nitrates in the batch formulation may be limited by the high costs and/or higher environmental impact of the alternative materials





Table 30

BAT-AELs for NOX emissions from the melting furnace in the domestic glass sector, when nitrates are used in the batch formulation for a limited number of short campaigns or for melting furnaces with a capacity < 100 t/day producing special types of soda-lime glasses (clear/ultra-clear glass or coloured glass using selenium) and other special glasses (i.e. borosilicate, glass ceramics, opal glass, crystal and lead crystal

Parameter Type of furnace BAT-AEL mg/Nm3 kg/tonne melted glass NOX expressed as NO2 Fuel/air conventional furnaces < 500 – 1 500 < 1,25 – 3,75 (90) Electric melting < 300 – 500 < 8 – 10

1.5.3. Sulphur oxides (SOX) from melting furnaces

41. BAT is to reduce SOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (91) Applicability (i) Minimisation of the sulphur content in the batch formulation and optimisation of the sulphur balance The minimisation of the sulphur content in the batch formulation is generally applicable within the constraints of quality requirements of the final glass product. The application of sulphur balance optimisation requires a trade-off approach between the removal of SOX emissions and the management of the solid waste (filter dust) (ii) Use of low sulphur content fuels The applicability may be limited by the constraints associated with the availability of low sulphur fuels, which may be impacted by the energy policy of the Member State (iii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable





Table 31

BAT-AELs for SOX emissions from the melting furnace in the domestic glass sector

Parameter Fuel/melting technique BAT-AEL mg/Nm3 kg/tonne melted glass (92) SOx expressed as SO2 Natural gas < 200 – 300 < 0,5 – 0,75 Fuel oil (93) < 1 000 < 2,5 Electric melting < 100 < 0,25

1.5.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

42. BAT is to reduce HCl and HF emissions from the melting furnace by using one or a combination of the following techniques:

Technique (94) Applicability (i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine The applicability may be limited by the constraints of the batch formulation for the type of glass produced at the installation and the availability of raw materials (ii) Minimisation of the fluorine content in the batch formulation and optimisation of the fluorine mass balance The minimisation of fluorine emissions from the melting process may be achieved by minimising/reducing the quantity of fluorine compounds (e.g. fluorspar) used in the batch formulation to the minimum commensurate with the quality of the final product. Fluorine compounds are added to the batch formulation to give an opaque or cloudy appearance to the glass The technique is generally applicable within the constraints of the quality requirements for the final product (iii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable (iv) Wet scrubbing The technique is generally applicable within technical constraints; i.e. need for a specific waste water treatment plant. High costs, waste water treatment aspects, including restrictions in the recycle of sludge or solid residues from the water treatment, may limit the applicability of this technique





Table 32

BAT-AELs for HCl and HF emissions from the melting furnace in the domestic glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (95) Hydrogen chloride, expressed as HCl (96) (97) < 10 – 20 < 0,03 – 0,06 Hydrogen fluoride, expressed as HF (98) < 1 – 5 < 0,003 – 0,015

1.5.5. Metals from melting furnaces

43. BAT is to reduce metal emissions from the melting furnace by using one or a combination of the following techniques:

Technique (99) Applicability (i) Selection of raw materials for the batch formulation with a low content of metals The applicability may be limited by the constraints imposed by the type of glass produced at the installation and the availability of raw materials (ii) Minimising the use of metal compounds in the batch formulation, through a suitable selection of the raw materials where colouring and decolourising of glass is needed or where specific characteristics are conferred to the glass For the production of crystal and lead crystal glasses the minimisation of metal compounds in the batch formulation is restricted by the limits defined in Directive 69/493/EEC which classifies the chemical composition of the final glass products. (iii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable





Table 33

BAT-AELs for metal emissions from the melting furnace in the domestic glass sector with the exception of glasses where selenium is used for decolourising

Parameter BAT-AEL (100) mg/Nm3 kg/tonne melted glass (101) Σ (As, Co, Ni, Cd, Se, CrVI) < 0,2 – 1 < 0,6 – 3 × 10–3 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) < 1 – 5 < 3 – 15 × 10–3

44. When selenium compounds are used for decolourising the glass, BAT is to reduce selenium emissions from the melting furnace by using one or a combination of the following techniques

Technique (102) Applicability (i) Minimising the use of selenium compounds in the batch formulation, through a suitable selection of the raw materials The applicability may be limited by the constraints imposed by the type of glass produced at the installation and the availability of raw materials (ii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable





Table 34

BAT-AELs for selenium emissions from the melting furnace in the domestic glass sector when selenium compounds are used for decolourising the glass

Parameter BAT-AEL (103) mg/Nm3 kg/tonne melted glass (104) Selenium compounds, as Se < 1 < 3 × 10–3

45. When lead compounds are used for the manufacturing of lead crystal glass, BAT is to reduce lead emissions from the melting furnace by using one or a combination of the following techniques:

Technique (105) Applicability (i) Electric melting Not applicable for large volume glass productions (> 300 tonnes/day). Not applicable for productions requiring large pull variations. The implementation requires a complete furnace rebuild (ii) Bag filter The technique is generally applicable (iii) Electrostatic precipitator (iv) Dry or semi-dry scrubbing, in combination with a filtration system





Table 35

BAT-AELs for lead emissions from the melting furnace in the domestic glass sector when lead compounds are used for manufacturing lead crystal glass

Parameter BAT-AEL (106) mg/Nm3 kg/tonne melted glass (107) Lead compounds, expressed as Pb < 0,5 – 1 < 1 – 3 × 10–3

1.5.6. Emissions from downstream processes

46. For downstream dusty processes, BAT is to reduce emissions of dust and metals by using one or a combination of the following techniques:

Technique (108) Applicability (i) Performing dusty operations (e.g. cutting, grinding, polishing) under liquid The techniques are generally applicable (ii) Applying a bag filter system





Table 36

BAT-AELs for air emissions from dusty downstream processes in the domestic glass sector, when treated separately

Parameter BAT-AEL mg/Nm3 Dust < 1 – 10 Σ (As, Co, Ni, Cd, Se, CrVI) (109) < 1 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) (109) < 1 – 5 Lead compounds, expressed as Pb (110) < 1 – 1,5

47. For acid polishing processes, BAT is to reduce HF emissions by using one or a combination of the following techniques:

Technique (111) Applicability (i) Minimising the losses of polishing product by ensuring a good sealing of the application system The techniques are generally applicable (ii) Applying a secondary technique, e.g. wet scrubbing.





Table 37

BAT-AELs for HF emissions from acid polishing processes in the domestic glass sector, when treated separately

Parameter BAT-AEL mg/Nm3 Hydrogen fluoride, expressed as HF < 5

1.6. BAT conclusions for special glass manufacturing

Unless otherwise stated, the BAT conclusions presented in this section can be applied to all special glass manufacturing installations.

1.6.1. Dust emissions from melting furnaces

48. BAT is to reduce dust emissions from the waste gases of the melting furnace by using one or a combination of the following techniques:

Technique (112) Applicability (i) Reduction of the volatile components by raw material modifications The formulation of the batch composition may contain very volatile components (e.g. boron, fluorides) which represent the main constituents of dust emitted from the melting furnace The technique is generally applicable within the constraints of the quality of the glass produced (ii) Electric melting Not applicable for large volume glass productions (> 300 tonnes/day) Not applicable for productions requiring large pull variations The implementation requires a complete furnace rebuild (iii) Filtration system: electrostatic precipitator or bag filter The technique is generally applicable





Table 38

BAT-AELs for dust emissions from the melting furnace in the special glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (113) Dust < 10 – 20 < 0,03 – 0,13 < 1 – 10 (114) < 0,003 – 0,065

1.6.2. Nitrogen oxides (NOX) from melting furnaces

49. BAT is to reduce NOX emissions from the melting furnace by using one or a combination of the following techniques:

I. primary techniques, such as: Technique (115) Applicability (i) Combustion modifications (a) Reduction of air/fuel ratio Applicable to air/fuel conventional furnaces. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (b) Reduced combustion air temperature Applicable only under installation-specific circumstances due to a lower furnace efficiency and higher fuel demand (i.e. use of recuperative furnaces in place of regenerative furnaces) (c) Staged combustion: — Air staging — Fuel staging Fuel staging is applicable to most conventional air/fuel furnaces. Air staging has very limited applicability due to the technical complexity (d) Flue-gas recirculation The applicability of this technique is limited to the use of special burners with automatic recirculation of the waste gas (e) Low-NOX burners The technique is generally applicable. The achieved environmental benefits are generally lower for applications to cross-fired, gas-fired furnaces due to technical constraints and a lower degree of flexibility of the furnace. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (f) Fuel choice The applicability is limited by the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State (ii) Electric melting Not applicable for large volume glass productions (> 300 tonnes/day). Not applicable for productions requiring large pull variations. The implementation requires a complete furnace rebuild (iii) Oxy-fuel melting The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild

II. secondary techniques, such as: Technique (116) Applicability (i) Selective catalytic reduction (SCR) The application may require an upgrade of the dust abatement system in order to guarantee a dust concentration of below 10 – 15 mg/Nm3 and a desulphurisation system for the removal of SOX emissions Due to the optimum operating temperature window, the applicability is limited to the use of electrostatic precipitators. In general, the technique is not used with a bag filter system because the low operating temperature, in the range of 180 – 200 °C, would require reheating of the waste gases. The implementation of the technique may require significant space availability (ii) Selective non-catalytic reduction (SNCR) Very limited applicability to conventional regenerative furnaces, where the correct temperature window is difficult to access or does not allow a good mixing of the flue-gases with the reagent It may be applicable to new regenerative furnaces equipped with split regenerators; however, the temperature window is difficult to maintain due to the reversal of fire between the chambers that causes a cyclical temperature change

Table 39

BAT-AELs for NOX emissions from the melting furnace in the special glass sector

Parameter BAT BAT-AEL mg/Nm3 kg/tonne melted glass (117) NOX expressed as NO2 Combustion modifications 600 – 800 1,5 – 3,2 Electric melting < 100 < 0,25 – 0,4 Oxy-fuel melting (118) (119) Not applicable < 1 – 3 Secondary techniques < 500 < 1 – 3

50. When nitrates are used in the batch formulation, BAT is to reduce NOX emissions by minimising the use of these raw materials, in combination with either primary or secondary techniques

Technique (120) Applicability Primary techniques — minimising the use of nitrates in the batch formulation The use of nitrates is applied for very high quality products, where special characteristics of the glass are required. Effective alternative materials are sulphates, arsenic oxides, cerium oxide The substitution of nitrates in the batch formulation may be limited by the high costs and/or higher environmental impact of the alternative materials





Table 40

BAT-AELs for NOX emissions from the melting furnace in the special glass sector when nitrates are used in the batch formulation

Parameter BAT BAT-AEL (121) mg/Nm3 kg/tonne melted glass (122) NOX expressed as NO2 Minimisation of nitrate input in the batch formulation combined with primary or secondary techniques < 500 – 1 000 < 1 – 6

1.6.3. Sulphur oxides (SOX) from melting furnaces

51. BAT is to reduce SOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (123) Applicability (i) Minimisation of the sulphur content in the batch formulation and optimisation of the sulphur balance The technique is generally applicable within the constraints of quality requirements of the final glass product (ii) Use of low sulphur content fuels The applicability may be limited by the constraints associated with the availability of low sulphur fuels, which may be impacted by the energy policy of the Member State (iii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable





Table 41

BAT-AELs for SOX emissions from the melting furnace in the special glass sector

Parameter Fuel/melting technique BAT-AEL (124) mg/Nm3 kg/tonne melted glass (125) SOX expressed as SO2 Natural gas, electric melting (126) < 30 – 200 < 0,08 – 0,5 Fuel oil (127) 500 – 800 1,25 – 2

1.6.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

52. BAT is to reduce HCl and HF emissions from the melting furnace by using one or a combination of the following techniques:

Technique (128) Applicability (i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine The applicability may be limited by the constraints of the batch formulation for the type of glass produced at the installation and the availability of raw materials (ii) Minimisation of the fluorine and/or chlorine compounds in the batch formulation and optimisation of the fluorine and/or chlorine mass balance Fluorine compounds are used to confer particular characteristics to special glasses (i.e. opaque lighting glass, optical glass). Chlorine compounds may be used as fining agents for borosilicate glass production The technique is generally applicable within the constraints of the quality requirements for the final product. (iii) Dry or semi-dry scrubbing, in combination with a filtration system The technique is generally applicable





Table 42

BAT-AELs for HCl and HF emissions from the melting furnace in the special glass sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (129) Hydrogen chloride, expressed as HCl (130) < 10 – 20 < 0,03 – 0,05 Hydrogen fluoride, expressed as HF < 1 – 5 < 0,003 – 0,04 (131)

1.6.5. Metals from melting furnaces

53. BAT is to reduce metal emissions from the melting furnace by using one or a combination of the following techniques:

Technique (132) Applicability (i) Selection of raw materials for the batch formulation with a low content of metals The applicability may be limited by the constraints imposed by the type of glass produced at the installation and the availability of raw materials (ii) Minimising the use of metal compounds in the batch formulation, through a suitable selection of the raw materials where colouring and decolourising of glass is needed or where specific characteristics are conferred to the glass The techniques are generally applicable (iii) Dry or semi-dry scrubbing, in combination with a filtration system





Table 43

BAT-AELs for metal emissions from the melting furnace in the special glass sector

Parameter BAT-AEL (133) (134) mg/Nm3 kg/tonne melted glass (135) Σ (As, Co, Ni, Cd, Se, CrVI) < 0,1 – 1 < 0,3 – 3 × 10–3 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) < 1 – 5 < 3 – 15 × 10–3

1.6.6. Emissions from downstream processes

54. For downstream dusty processes, BAT is to reduce emissions of dust and metals by using one or a combination of the following techniques:

Technique (136) Applicability (i) Performing dusty operations (e.g. cutting, grinding, polishing) under liquid The techniques are generally applicable (ii) Applying a bag filter system





Table 44

BAT-AELs for dust and metal emissions from downstream processes in the special glass sector, when treated separately

Parameter BAT-AEL mg/Nm3 Dust 1 – 10 Σ (As, Co, Ni, Cd, Se, CrVI) (137) < 1 Σ (As, Co, Ni, Cd, Se, CrVI, Sb, Pb, CrIII, Cu, Mn, V, Sn) (137) < 1 – 5

55. For acid polishing processes, BAT is to reduce HF emissions by using one or a combination of the following techniques:

Technique (138) Description (i) Minimising the losses of polishing product by ensuring a good sealing of the application system The techniques are generally applicable (ii) Applying a secondary technique, e.g. wet scrubbing





Table 45

BAT-AELs for HF emissions from acid polishing processes in the special glass sector, when treated separately

Parameter BAT-AEL mg/Nm3 Hydrogen fluoride, expressed as HF < 5

1.7. BAT conclusions for mineral wool manufacturing

Unless otherwise stated, the BAT conclusions presented in this section can be applied to all mineral wool manufacturing installations.

1.7.1. Dust emissions from melting furnaces

56. BAT is to reduce dust emissions from the waste gases of the melting furnace by applying an electrostatic precipitator or a bag filter system

Technique (139) Applicability Filtration system: electrostatic precipitator or bag filter The technique is generally applicable. Electrostatic precipitators are not applicable to cupola furnaces for stone wool production, due to the risk of explosion from the ignition of carbon monoxide produced within the furnace





Table 46

BAT-AELs for dust emissions from the melting furnace in the mineral wool sector

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (140) Dust < 10 – 20 < 0,02 – 0,050

1.7.2. Nitrogen oxides (NOX) from melting furnaces

57. BAT is to reduce NOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (141) Applicability (i) Combustion modifications (a) Reduction of air/fuel ratio Applicable to air/fuel conventional furnaces. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (b) Reduced combustion air temperature Applicable only under installation-specific circumstances due to a lower furnace efficiency and higher fuel demand (i.e. use of recuperative furnaces in place of regenerative furnaces) (c) Staged combustion: — Air staging — Fuel staging Fuel staging is applicable to most conventional air/fuel furnaces. Air staging has very limited applicability due to the technical complexity (d) Flue-gas recirculation The applicability of this technique is limited to the use of special burners with automatic recirculation of the waste gas (e) Low-NOX burners The technique is generally applicable. The achieved environmental benefits are generally lower for applications to cross-fired, gas-fired furnaces due to technical constraints and a lower degree of flexibility of the furnace. Full benefits are achieved at normal or complete furnace rebuild, when combined with optimum furnace design and geometry (f) Fuel choice The applicability is limited by the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State (ii) Electric melting Not applicable for large volume glass productions (> 300 tonnes/day). Not applicable for productions requiring large pull variations. The implementation requires a complete furnace rebuild (iii) Oxy-fuel melting The maximum environmental benefits are achieved for applications at the time of a complete furnace rebuild





Table 47

BAT-AELs for NOX emissions from the melting furnace in the mineral wool sector

Parameter Product Melting technique BAT-AEL mg/Nm3 kg/tonne melted glass (142) NOX expressed as NO2 Glass wool Fuel/air and electric furnaces < 200 – 500 < 0,4 – 1,0 Oxy-fuel melting (143) Not applicable < 0,5 Stone wool All types of furnaces < 400 – 500 < 1,0 – 1,25

58. When nitrates are used in the batch formulation for glass wool production, BAT is to reduce NOX emissions by using one or a combination of the following techniques:

Technique (144) Applicability (i) Minimising the use of nitrates in the batch formulation The use of nitrates is applied as an oxidising agent in batch formulations with high levels of external cullet to compensate for the presence of organic material contained in the cullet The technique is generally applicable within the constraints of the quality requirements for the final product (ii) Electric melting The technique is generally applicable. The implementation of electric melting requires a complete furnace rebuild (iii) Oxy-fuel melting The technique is generally applicable. The maximum environmental benefits are achieved for applications made at the time of a complete furnace rebuild





Table 48

BAT-AELs for NOX emissions from the melting furnace in glass wool production when nitrates are used in the batch formulation

Parameter BAT BAT-AEL mg/Nm3 kg/tonne melted glass (145) NOX expressed as NO2 Minimisation of nitrate input in the batch formulation, combined with primary techniques < 500 – 700 < 1,0 – 1,4 (146)

1.7.3. Sulphur oxides (SOX) from melting furnaces

59. BAT is to reduce SOX emissions from the melting furnace by using one or a combination of the following techniques:

Technique (147) Applicability (i) Minimisation of the sulphur content in the batch formulation and optimisation of the sulphur balance In glass wool production, the technique is generally applicable within the constraints of the availability of low-sulphur raw materials, in particular external cullet. High levels of external cullet in the batch formulation limit the possibility of optimising the sulphur balance due to a variable sulphur content. In the stone wool production, the optimisation of the sulphur balance may require a trade-off approach between the removal of SOX emissions from the flue-gases and the management of the solid waste, deriving from the treatment of the flue-gases (filter dust) and/or from the fiberising process, which may be recycled into the batch formulation (cement briquettes) or may need to be disposed of (ii) Use of low sulphur content fuels The applicability may be limited by the constraints associated with the availability of low sulphur fuels, which may be impacted by the energy policy of the Member State (iii) Dry or semi-dry scrubbing, in combination with a filtration system Electrostatic precipitators are not applicable to cupola furnaces for stone wool production (see BAT 56) (iv) Use of wet scrubbing The technique is generally applicable within technical constraints; i.e. need for a specific waste water treatment plant





Table 49

BAT-AELs for SOX emissions from the melting furnace in the mineral wool sector

Parameter Product/conditions BAT-AEL mg/Nm3 kg/tonne melted glass (148) SOX expressed as SO2 Glass wool Gas-fired and electric furnaces (149) < 50 – 150 < 0,1 – 0,3 Stone wool Gas-fired and electric furnaces < 350 < 0,9 Cupola furnaces, no briquettes or slag recycling (150) < 400 < 1,0 Cupola furnaces, with cement briquettes or slag recycling (151) < 1 400 < 3,5

1.7.4. Hydrogen chloride (HCl) and hydrogen fluoride (HF) from melting furnaces

60. BAT is to reduce HCl and HF emissions from the melting furnace by using one or a combination of the following techniques:

Technique (152) Description (i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine The technique is generally applicable within the constraints of the batch formulation and the availability of raw materials (ii) Dry or semi-dry scrubbing, in combination with a filtration system Electrostatic precipitators are not applicable to cupola furnaces for stone wool production (see BAT 56)





Table 50

BAT-AELs for HCl and HF emissions from the melting furnace in the mineral wool sector

Parameter Product BAT-AEL mg/Nm3 kg/tonne melted glass (153) Hydrogen chloride, expressed as HCl Glass wool < 5 – 10 < 0,01 – 0,02 Stone wool < 10 – 30 < 0,025 – 0,075 Hydrogen fluoride, expressed as HF All products < 1 – 5 < 0,002 – 0,013 (154)

1.7.5. Hydrogen sulphide (H2S) from stone wool melting furnaces

61. BAT is to reduce H2S emissions from the melting furnace by applying a waste gas incineration system to oxidise hydrogen sulphide to SO2

Technique (155) Applicability Waste gas incinerator system The technique is generally applicable to stone wool cupola furnaces





Table 51

BAT-AELs for H2S emissions from the melting furnace in stone wool production

Parameter BAT-AEL mg/Nm3 kg/tonne melted glass (156) Hydrogen sulphide, expressed as H2S < 2 < 0,005

1.7.6. Metals from melting furnaces

62. BAT is to reduce metal emissions from the melting furnace by using one or a combination of the following techniques:

Technique (157) Applicability (i) Selection of raw materials for the batch formulation with a low content of metals The technique is generally applicable within the constraints of the availability of raw materials. In glass wool production, the use of manganese in the batch formulation as an oxidising agent depends on the quantity and quality of external cullet employed in the batch formulation and may be minimised accordingly (ii) Application of a filtration system Electrostatic precipitators are not applicable to cupola furnaces for stone wool production (see BAT 56)





Table 52