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Division BAT 58 In order to reduce emissions to air of dust, particulate-bound metals, and trace species from the combustion of process fuels from the chemical industry in boilers, BAT is to use one or a combination of the techniques given below.

United Kingdom

Technique		Description	Applicability
a.	Electrostatic precipitator (ESP)	See descriptions in Section 8.5	Generally applicable
b.	Bag filter	See descriptions in Section 8.5	Generally applicable
c.	Fuel choice	See description in Section 8.5. Use of a combination of process fuels from the chemical industry and auxiliary fuels with a low averaged dust or ash content	Applicable within the constraints associated with the availability of different types of fuel and/or an alternative use of the process fuel
d.	Dry or semi-dry FGD system	See descriptions in Section 8.5. The technique is mainly used for SO_X, HCl and/or HF control	See applicability in BAT 57
e.	Wet flue-gas desulphurisation (wet FGD)		See applicability in BAT 57

Table 37

BAT-associated emission levels (BAT-AELs) for dust emissions to air from the combustion of mixtures of gases and liquids composed of 100 % process fuels from the chemical industry in boilers

Combustion plant total rated thermal input(MW_th)	BAT-AELs for dust (mg/Nm³)
For plants operated < 1 500 h/yr, these BAT-AELs do not apply.
For plants operated < 500 h/yr, these levels are indicative.
For plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 25 mg/Nm³.
For plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 15 mg/Nm³.
	Yearly average		Daily average or average over the sampling period
	New plant	Existing plant^f1	New plant	Existing plant^f2
< 300	2–5	2–15	2–10	2–22^f3
≥ 300	2–5	2–10^f4	2–10	2–11

Annotations

Footnotes

f1: For plants operated < 1 500 h/yr, these BAT-AELs do not apply.
f2: For plants operated < 500 h/yr, these levels are indicative.
f3: For plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 25 mg/Nm³.
f4: For plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 15 mg/Nm³.