Division BAT 60

United Kingdom

In order to reduce dust, sulphur dioxide, PAH and fluoride emissions to air from a baking plant in an anode production plant integrated with a primary aluminium smelter, BAT is to use one or a combination of the techniques given below.

	Technique^f1	Applicability
Descriptions of the techniques are given in Section 1.10.
a	Use of raw materials and fuels containing a low amount of sulphur	Generally applicable for reducing SO₂ emissions
b	Dry scrubber using alumina as the adsorbent agent followed by a bag filter	Generally applicable for reducing dust, PAH and fluoride emissions
c	Wet scrubber	Applicability for reducing dust, SO₂, PAH and fluoride emissions may be limited in the following cases: very high off-gas flow rates (due to the significant amounts of waste and waste water generated) in arid areas (due to the large volume of water necessary and the need for waste water treatment)
d	Regenerative thermal oxidiser in combination with a dust abatement system	Generally applicable for reducing dust and PAH emissions.

BAT-associated emission levels: See Table 8.

Table 8

BAT-associated emission levels for dust, BaP (as an indicator of PAH) and fluoride emissions to air from a baking plant in an anode production plant integrated with a primary aluminium smelter

Parameter	BAT-AEL (mg/Nm³)
As a daily average or as an average over the sampling period.
As an average over the sampling period.
Dust	2-5^f2
BaP	0,001-0,01^f3
HF	0,3-0,5
Total fluorides	≤ 0,8

Annotations

Footnotes

f1: Descriptions of the techniques are given in Section 1.10.
f2: As a daily average or as an average over the sampling period.
f3: As an average over the sampling period.