55 Only discharge the water from its storage after the conclusion of all the treatment measures and a subsequent final inspection (see Section 4.7.1) 56 Achieve the following emissions level values before discharge by applying a suitable combination of techniques mentioned in Sections 4.4.2.3 and 4.7. The techniques mentioned above in this section on ‘waste water management’ (BAT number 42 – 55) also contribute to reach these values.
74a a. ensuring that the customary measurement methods are used 74b b. separately storing the neutralised waste water 74c c. performing a inspection of the neutralised waste water after a sufficient storage time has elapsed. 75 the following techniques to aid precipitation of the metals in treatment processes (see Section 4.3.1.4): 75a a. adjusting the pH to the point of minimum solubility where the metals will precipitate
79 Apply the following techniques to waste waters containing chromium (VI) compounds (see Section 4.3.1.8): 79a a. avoiding the mixing of Cr(VI) wastes with other wastes 79b b. reducing Cr(VI) to Cr(III) 79c c. precipitating the trivalent metal. 80 Apply the following techniques to waste waters containing nitrites (see Section 4.3.1.9):
For the regeneration of waste activated carbon, BAT is to: 109 Have an effective quality control procedure in place to ensure that the operator can differentiate between the carbon used for potable water or food grade carbon and the rest of spent carbons (the so-called ‘industrial carbons’) (see Section 4.4.4.2) 110 Require a written undertaking from customers indicating what the activated carbon has been used for (see Section 4.1.2.3 and this is also related to BAT number 12.c) 111 Utilise an indirect fired kiln for industrial carbons –it may be argued that this could equally be applied to potable water carbons. However, limits on capacity and corrosion may deem that only multiple hearth or direct fired rotary kilns may be used (see Section 4.4.4.1) 112 Utilise an afterburner with a minimum of 1100 °C, two seconds residence time and 6 % excess oxygen for the regeneration of industrial carbons where refractory halogenated or other thermally resistant substances are likely to be present. In other cases, less stringent thermal conditions are sufficient (see Section 4.4.4.2)
113 Utilise an afterburner with a minimum heating temperature of 850 °C, two seconds residence time and 6 % excess oxygen for potable water and food grade active carbons (see Section 4.4.4.2) 114 Apply a flue-gas treatment train consisting of quench and/or venturi and aqueous scrubbing sections, followed by an induced draft fan (see Section 4.4.4.2) 115 Utilise a caustic or soda ash scrubbing solutions to neutralise acid gases for industrial carbon plants (see Section 4.4.4.2) 116 Have a WWTP containing an appropriate combination of flocculation, settlement, filtration and pH adjustment for the treatment of potable water carbons. For effluents of industrial carbons, applying additional treatments (e.g. metal hydroxide precipitation, sulphide precipitation) are also considered BAT (see Section 4.4.4.3) Preparation of to be used as fuel
128 Use bags filters for the abatement of particulates (see Section 4.6.26) For the preparation of liquid waste fuels from hazardous waste, BAT is to: 129 Use heat-exchange units external to the vessel if heating of the liquid fuel is required (Section 4.5.4.1) 130 Adapt the suspended solid content to ensure the homogeneity of the liquid fuel (see Section 4.5.4.1)