Division BAT 142

United Kingdom

In order to reduce SO₂ emissions to air (other than those that are routed to the sulphuric acid plant) from a melting and smelting operation for the production of Doré metal, including the associated incineration, calcining and drying operations, BAT is to use one or a combination of the techniques given below.

Descriptions of the techniques are given in Section 1.10.
	Technique^f1	Applicability
a	Lime injection in combination with a bag filter	Generally applicable
b	Wet scrubber	Applicability 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)

Descriptions of the techniques are given in Section 1.10.

Technique^f1

Applicability

Lime injection in combination with a bag filter

Generally applicable

Wet scrubber

Applicability 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)

BAT-associated emission levels: See Table 41.

Table 41

BAT-associated emission levels for SO₂ emissions to air (other than those that are routed to the sulphuric acid plant) from a melting and smelting operation for the production of Doré metal, including the associated incineration, calcining and drying operations

Parameter	BAT-AEL (mg/Nm³)^f2
As a daily average or as an average over the sampling period.
SO₂	50-480

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.