1.3.2.1. Air emissions U.K.
1.3.2.1.1. Dust, PAH and fluoride emissions from the paste plant U.K.
BAT 58.In order to reduce dust emissions to air from a paste plant (removing coke dust from operations such as coke storage and grinding), BAT is to use a bag filter.U.K.
BAT-associated emission levels: See Table 7.
BAT 59.In order to reduce dust and PAH emissions to air from a paste plant (hot pitch storage, paste mixing, cooling and forming), BAT is to use one or a combination of the techniques given below.U.K.
| a Descriptions of the techniques are given in Section 1.10. | |
| Techniquea | |
|---|---|
| a | Dry scrubber using coke as the adsorbent agent, with or without precooling, followed by a bag filter |
| b | Regenerative thermal oxidiser |
| c | Catalytic thermal oxidiser |
BAT-associated emission levels: See Table 7.
Table 7
BAT-associated emission levels for dust and BaP (as an indicator of PAH) emissions to air from a paste plant
| a As a daily average or as an average over the sampling period. | ||
| b As an average over the sampling period. | ||
| Parameter | Process | BAT-AEL (mg/Nm3) |
|---|---|---|
| Dust |
| 2-5a |
| BaP | Hot pitch storage, paste mixing, cooling and forming | 0,001-0,01b |
The associated monitoring is in BAT 10.
1.3.2.1.2. Dust, sulphur dioxide, PAH and fluoride emissions from the baking plant U.K.
BAT 60.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.U.K.
| a Descriptions of the techniques are given in Section 1.10. | ||
| Techniquea | Applicability | |
|---|---|---|
| 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:
|
| 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
The associated monitoring is in BAT 10.
BAT 61.In order to reduce dust, PAH and fluoride emissions to air from a baking plant in a stand-alone anode production plant, BAT is to use a pre-filtration unit and a regenerative thermal oxidiser followed by a dry scrubber (e.g. lime bed).U.K.
BAT-associated emission levels: See Table 9.
Table 9
BAT-associated emission levels for dust, BaP (as an indicator of PAH) and fluoride emissions to air from a baking plant in a stand-alone anode production plant
The associated monitoring is in BAT 10.