JCM_ID_F_PM_ver01.0

JCM Proposed Methodology Form
Cover sheet of the Proposed Methodology Form
Form for submitting the proposed methodology
Host Country

The Republic of Indonesia

Name of the methodology proponents Environmental Management and Technology
submitting this form

Center (EMATEC)

Sectoral scope(s) to which the Proposed 3. Energy demand
Methodology applies
Title of the proposed methodology, and Replacement of diffuser with aerator in aeration
version number

pond, ver.1.0

List of documents to be attached to this form

The attached draft JCM-PDD:(please check):

Additional information

Date of completion

01/04/2020

History of the proposed methodology
VersionDate

1.0

01/04/2020

Contents revisedFirst edition

1JCM_ID_F_PM_ver01.0

A. Title of the methodology
Replacement of diffuser with aerator in aeration pond, ver. 1.0

B. Terms and definitions
Terms
Diffuser

Definitions
Aeration device in the shape of a disc, tube or plate, which isused to supply air from blowers into wastewater for aerobic
wastewater treatment by producing fine bubbles in aeration
ponds for wastewater treatment.

Aerator

Aeration device without power unit, which is used to supply
air from blowers into wastewater for aerobic wastewater
treatment by mixing air and wastewater in itself andproducing water circulation in the entire aeration ponds.

C. Summary of the methodology
Items
GHG

emissionmeasures

Summary
reduction For aerobic wastewater treatment, aeration device(s) is(are) used
for supplying air into wastewater. Replacement of the diffuserwith the aerator enables to reduce air discharge pressure atblower(s), to run blower(s) not continuously but intermittently
and to reduce discharge amounts of air from blower(s). By theseeffects, electricity consumption at blower(s) can be reduced.

Calculation

ofemissions

reference Reference emissions are calculated with electricity consumptionof blower(s) connected with project aeration devices of aerator(hereinafter referred to as “project blower(s)”), ratio of
operating time of blower(s) connected with reference aerationdevices of diffuser (hereinafter referred to as “referenceblower(s)”) and project blower(s), ratio of shaft power ofreference/project blower(s), and CO2 emission factor forconsumed electricity.

Calculationofproject Project emissions are calculated with electricity consumption of2

JCM_ID_F_PM_ver01.0emissions

project blower(s) and CO2 emission factor for consumed
electricity.

Monitoring parameters

× Electricity consumption at project blower(s)× Operating time of project blower(s)× Stop time of project blower(s) during intermittent operation
× Discharge pressure of project blower(s)× Rotations per minute of project blower(s)D. Eligibility criteria
This methodology is applicable to projects that satisfy all of the following criteria.
Criterion 1

Aerator(s) is(are) installed to replace existing diffuser(s) in existing aeration
pond(s) for wastewater treatment.

Criterion 2

Effluent wastewater quality meets the wastewater quality standards on items
such as biochemical oxygen demand (BOD), chemical oxygen demand (COD)
and total suspended solids (TSS)

which are applicable to the project site.

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG types

Electricity consumption by blower(s) which supply air to diffuser(s)CO2Project emissions
Emission sources

GHG types

Electricity consumption by blower(s) which supply air to aerator(s)CO2

F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions
The shaft power of reference blower(s) and project blower(s) is conservatively set in thefollowing manner to conservatively calculate reference emissions and ensure the net emission
reductions.
1. The estimated shaft power of the reference blower i during the period p (SPRE,i,p) is3

JCM_ID_F_PM_ver01.0

selected from the performance table of the blower i with the calculated daily dischargepressure of the reference blower i during the period p (PSRE,i,p) and the calculated
rotations per minute (RPM) of the reference blower i during the period p (RPMRE,i,p). The
performance table of the blower i is provided by manufacturer of the blower i.
ܵܲோா,௜,௣ = ݂ோா ൫ܲܵோா,௜,௣ , ܴܲ‫ܯ‬ோா,௜,௣ ൯
SPRE,i,p: Estimated shaft power of the reference blower i during the period p [kW]PSRE,i,p: Calculated daily discharge pressure of the reference blower i during theperiod p [Pa (G)] (gauge pressure, and so forth)

RPMRE,i,p : Calculated RPM of the reference blower i during the period p [rpm]2. PSRE,i,p is calculated by the average daily discharge pressure of the project blower imonitored once a day during the period p (PSPJ,ave,i,p) divided by the ratio of dischargepressure change at the blower i (FPS,i). FPS,i is calculated by the highest daily dischargepressure of the project blower i monitored once a day during the parameter monitoring
period intpj which start after completion of aerator installation (PSPJ,high,i,intpj) divided by
the lowest daily discharge pressure of the reference blower i monitored once a day during
the parameter monitoring period intre before the aerator installation (PSRE,low,i,intre).
ܲܵோா,௜,௣ = ܲܵ௉௃,௔௩௘,௜,௣ ÷ ‫ܨ‬௉ௌ,௜‫ܨ‬௉ௌ,௜ = ܲܵ௉௃,௛௜௚௛,௜,௜௡௧௣௝ ÷ ܲܵோா,௟௢௪,௜,௜௡௧௥௘
PSPJ,ave,i,p: Average daily discharge pressure of the project blower i during theperiod p [Pa (G)]FPS,i: Ratio of discharge pressure change at the blower i [-]PSPJ,high,i,intpj : Highest daily discharge pressure of the project blower i during theparameter monitoring period after completion of aerator installation[Pa (G)]
PSRE,low,i,intre: Lowest daily discharge pressure of the reference blower i during theparameter monitoring period before the aerator installation [Pa (G)]If the project blower i is replaced at the time Tp,change during the period p, emission
reductions during the time Tp,start, which is the start time of the period p, and Tp,change arecalculated with PSPJ,ave,i,p which is monitored from Tp,start to Tp,change. Emission reductions
after Tp,change are calculated based on PSPJ,ave,i,p which is monitored after Tp,change to the end
time of the period p (Tp,end).

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JCM_ID_F_PM_ver01.0

3. RPMRE,i,p is calculated from the average RPM of the project blower i during the period p(RPMPJ,ave,i,p) divided by the ratio of RPM change at the blower i (FRPM,i). FRPM,i means theratio of RPM change from the reference blower i to the project blower i at completion ofaerator installation and is provided by the manufacturer of pulley because RPM isassociated with specification of pulley. RPMPJ,ave,i,p is monitored by rotation speed meter
once a day during the period p.
ܴܲ‫ܯ‬ோா,௜,௣ = ܴܲ‫ܯ‬௉௃,௔௩௘,௜,௣ ÷ ‫ܨ‬ோ௉ெ,௜
FRPM,i: Ratio of RPM change at the blower i [-]RPMPJ,ave,i,p : Average RPM of the project blower i during the period p [rpm]4. The estimated shaft power of the project blower i during the period p (SPPJ,i,p) is selectedfrom the performance table of the blower i with the PSPJ,ave,i,p and RPMPJ,ave,i,p.
ܵܲ௉௃,௜,௣ = ݂௉௃ ൫ܲܵ௉௃,௔௩௘,௜,௣ , ܴܲ‫ܯ‬௉௃,௔௩௘,௜,௣ ൯
SPPJ,i,p: Estimated shaft power of the project blower i during the period p [kW]Note 1: The performance table of the blower i shows relationship among discharge pressure[Pa (G)], RPM [rpm] and shaft power [kW] of the blower i in tabular format.
Note 2: Default value of the parameter monitoring period is 1 week excluding exceptional
operation. The value of RPM of the blower i and depth of aeration pond(s) during theparameter monitoring period need to be the same as the value monitored before theinstallation of aerator. Monitored discharge pressure or RPM data on exceptional
operation, such as during maintenance of blower, black out, accident of blower or
aeration device etc., are excluded from data set for determining PSPJ,ave,i,p, PSPJ,high,i,intpj,PSRE,low,i,intre, and RPMPJ,ave,i,p.

F.2. Calculation of reference emissions
The electricity consumption of the reference blower i during the period p (ECRE,i,p) is calculatedby the product of SPRE,i,p, the motor efficiency of the reference blower i (Hi) and OTRE,i,p. Since
Hi is common to the project blower i, reference emissions are calculated by following equation.

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JCM_ID_F_PM_ver01.0ܴ‫ܧ‬௣ = ෍ ቊ௜ܱܶோா,௜,௣ ܵܲோா,௜,௣
×× ‫ܥܧ‬௉௃,௜,௣ × ‫ܨܧ‬௘௟௘௖ ቋܱܶ௉௃,௜,௣ ܵܲ௉௃,௜,௣

REp: Reference emissions during the period p [tCO2/p]

OTRE,i,p: Operating time of the reference blower i during the period p [h/p]

OTPJ,i,p: Operating time of the project blower i during the period p [h/p]SPRE,i,p: Estimated shaft power of the reference blower i during the period p [kW]SPPJ,i,p: Estimated shaft power of the project blower i during the period p [kW]ECPJ,i,p: Electricity consumption of the project blower i during the period p[kWh/p]

EFelec: CO2 emission factor for consumed electricity [tCO2/kWh]

OTRE,i,p is calculated from OTPJ,i,p added by the stop time of the project blower i during
intermittent operation during the period p (ITPJ,i,p) since the reference blower(s) is(are) notallowed to run intermittently and needs to be run continuously for preventing clogging of poresin diffuser.
ܱܶோா,௜,௣ = ܱܶ௉௃,௜,௣ + ‫ܶܫ‬௉௃,௜,௣
ITPJ,i,p: Stop time of the project blower i during intermittent operation during theperiod p [h/p]G. Calculation of project emissions
Project emissions are calculated by following equation.

ܲ‫ܧ‬௣ = ෍൫‫ܥܧ‬௉௃,௜,௣ × ‫ܨܧ‬௘௟௘௖ ൯௜

PEp: Project emissions during the period p [tCO2/p]

ECPJ,i,p: Electricity consumption of project blower i during the period p [kWh/p]

EFelec: CO2 emission factor for consumed electricity [tCO2/kWh]6

JCM_ID_F_PM_ver01.0

H. Calculation of emissions reductions
Emission reductions are calculated as the difference between the reference emissions andproject emissions, as follows:

ER p = RE p - PE p
ERp: Emissions reductions during the period p [tCO2/p]

REp: Reference emissions during the period p [tCO2/p]

PEp: Project emissions during the period p [tCO2/p]

I. Data and parameters fixed ex ante
The source of each data and parameter fixed ex ante is listed as below.
Parameter
EFelecDescription of data
CO2 emission factor for consumed electricity.

Source[Grid electricity]
The most recent value available

When project blower consumes only grid at the time of validation iselectricity or captive electricity, the project applied and fixed for theparticipant applies the CO2 emission factor monitoring period thereafter.
respectively.

The data is sourced from GridEmission

Factor(GEF)

of

When project blower may consume both grid Thailand”,

endorsedbyelectricity and captive electricity, the project Thailand

GreenhouseGas

participant applies the CO2 emission factor Managementwith lower value.

Organization

unless otherwise instructed bythe Joint Committee.

[CO2 emission factor][Captive electricity]

For grid electricity: The most recent value For the option a)available from the source stated in this table at Specification of the captive
the time of validation

power

generation

systemprovided by the manufacturer
For captive electricity, it is determined based (ηelec [%]).
on the following options:

CO2 emission factor of thefossil fuel type used in the7

JCM_ID_F_PM_ver01.0a) Calculated from its power generation captiveefficiency(ηelec[%])obtainedpower

generationfrom system (EFfuel [tCO2/GJ])

manufacturer’s specification
The power generation efficiency based on For the option b)
lower heating value (LHV) of the captive Generated
power

generation

systemfromsupplied

the electricity by the captive power

manufacturer’s specification is applied;‫ܨܧ‬௘௟௘௖ = 3.6 ×andgeneration

100× ‫ܨܧ‬௙௨௘௟ߟ௘௟௘௖

system(EGPJ,p[MWh/p]).
Fuel amount consumed by theb) Calculated from measured data

captive

powergeneration

system(FCPJ,p[massorThe power generation efficiency calculated volume/p]).
from monitored data of the amount of fuel Net calorific value (NCVfuel
input for power generation (‫ܥܨ‬௉௃,௣ ) and the [GJ/mass or volume]) and CO2amount of electricity generated ( ‫ܩܧ‬௉௃,௣ ) emission factor of the fuelduring the monitoring period p is applied. The (EFfuel [tCO2/GJ]) in order ofmeasurement is conducted with the monitoring preference:equipment to which calibration certificate is 1) values provided by the fuelissuedbyanentity

accredited

under supplier;

national/international standards;‫ܨܧ‬௘௟௘௖ = ‫ܥܨ‬௉௃,௣ × ܰ‫ܸܥ‬௙௨௘௟ × ‫ܨܧ‬௙௨௘௟ ×Where:2) measurement by the project1‫ܩܧ‬௉௃,௣participants;
3) regional or national default
values;ܰ‫ܸܥ‬௙௨௘௟ : Net calorific value of consumed 4)
fuel [GJ/mass or volume]

IPCC

defaultvalues

provided in tables 1.2 and 1.4
of Ch.1 Vol.2 of 2006 IPCC
Guidelines on National GHG

Note:Inventories. Lower value is

In case the captive electricity generation applied.
system meets all of the following conditions,the value in the following table may beapplied to ‫ܨܧ‬௘௟௘௖ depending on the consumed [Captive electricity with diesel
fuel]
fuel type.

CDM approved small scale・ The system is non-renewable generation methodology: AMS-I.A.
system・ Electricity generation capacity of the [Captive electricity with natural8

JCM_ID_F_PM_ver01.0

system is less than or equal to 15 MWgas]
2006

fuel type‫ܨܧ‬௘௟௘௖

Dieselfuel

Natural gas

0.8 *10.46 *2

IPCC

Guidelineson

National GHG Inventories forthe source of EF of natural gas.
CDM

Methodological"Determining

thetoolbaseline

efficiency of thermal or electric*1 The most recent value at the time of energy
validation is applied.

generation

systemsversion02.0" for the default*2 The value is calculated with the equation in efficiency for off-grid power
the option a) above. The lower value of default plants.
effective CO2 emission factor for natural gas(0.0543tCO2/GJ), and the most efficient valueof default efficiency for off-grid gas turbine
systems (42%) are applied.
PSRE,low,i,intre

Lowest daily discharge pressure of theDischarge pressure isreference blower i during the parametermonitored by pressure gaugemonitoring period intre before the aerator

installed at discharge air pipe ofinstallation [Pa (G)]the blower i. PSRE,low,i,intre needs
to be monitored before thePSRE,low,i,intre is selected from the daily data

aerator installation.

which is monitored once a day during theparameter monitoring period before the aerator
installation.
PSPJ,high,i,intpj

Highest daily discharge pressure of the project

Discharge pressure is measured

blower i during the parameter monitoringby pressure gauge installed atperiod intpj after completion of aerator

discharge air pipe of the blower

installation [Pa (G)]i. PSPJ,high,i,intpj needs to bemonitored just after completion

PSPJ,high,i,intpj is selected from the daily data of aerator installation.
which is monitored once a day during theparameter monitoring period which start after
completion of aerator installation.
FPS,iRatio of discharge pressure change at theFPS,i is calculated byblower i [-]PSPJ,high,i,intpj divided by
PSRE,low,i,intre.

FRPM,iRatio of RPM change at the blower i [-]9

FRPM,i is provided by theJCM_ID_F_PM_ver01.0

manufacturer of pulley or
calculated from the diameter ofpulleys of the project/reference
blower i.

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