Division 1.5.2.1 Emissions of dust, metals and metalloids

United Kingdom

BAT 25. In order to reduce channelled emissions to air of dust, metals and metalloids from the incineration of waste, BAT is to use one or a combination of the techniques given below.

	Technique	Description	Applicability
(a)	Bag filter	See Section 2.2	Generally applicable to new plants. Applicable to existing plants within the constraints associated with the operating temperature profile of the FGC system.
(b)	Electrostatic precipitator	See Section 2.2	Generally applicable.
(c)	Dry sorbent injection	See Section 2.2. Not relevant for the reduction of dust emissions. Adsorption of metals by injection of activated carbon or other reagents in combination with a dry sorbent injection system or a semi-wet absorber that is used to reduce acid gas emissions.	Generally applicable.
(d)	Wet scrubber	See Section 2.2. Wet scrubbing systems are not used to remove the main dust load but, installed after other abatement techniques, to further reduce the concentrations of dust, metals and metalloids in the flue-gas.	There may be applicability restrictions due to low water availability, e.g. in arid areas.
(e)	Fixed- or moving-bed adsorption	See Section 2.2. The system is used mainly to adsorb mercury and other metals and metalloids as well as organic compounds including PCDD/F, but also acts as an effective polishing filter for dust.	The applicability may be limited by the overall pressure drop associated with the FGC system configuration. In the case of existing plants, the applicability may be limited by a lack of space.

Table 3

BAT-associated emission levels (BAT-AELs) for channelled emissions to air of dust, metals and metalloids from the incineration of waste

Parameter	BAT-AEL	Averaging period
For existing plants dedicated to the incineration of hazardous waste and for which a bag filter is not applicable, the higher end of the BAT-AEL range is 7 mg/Nm³.
(mg/Nm³)
Dust	< 2–5 ^f1	Daily average
Cd+Tl	0,005–0,02	Average over the sampling period
Sb+As+Pb+Cr+Co+Cu+Mn+Ni+V	0,01–0,3	Average over the sampling period

The associated monitoring is in BAT 4.

BAT 26. In order to reduce channelled dust emissions to air from the enclosed treatment of slags and bottom ashes with extraction of air (see BAT 24(f)), BAT is to treat the extracted air with a bag filter (see Section 2.2).

Table 4

BAT-associated emission levels (BAT-AELs) for channelled dust emissions to air from the enclosed treatment of slags and bottom ashes with extraction of air

Parameter	BAT-AEL	Averaging period
(mg/Nm³)
Dust	2–5	Average over the sampling period

The associated monitoring is in BAT 4.

Annotations

Footnotes

f1: For existing plants dedicated to the incineration of hazardous waste and for which a bag filter is not applicable, the higher end of the BAT-AEL range is 7 mg/Nm³.