Division BAT 27 In order to prevent or reduce mercury emissions to air from the combustion of solid biomass and/or peat, BAT is to use one or a combination of the techniques given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| Specific techniques to reduce mercury emissions | |||
| a. | Carbon sorbent (e.g. activated carbon or halogenated activated carbon) injection in the flue-gas | See descriptions in Section 8.5 | Generally applicable |
| b. | Use of halogenated additives in the fuel or injected in the furnace | Generally applicable in the case of a low halogen content in the fuel | |
| c. | Fuel choice | Applicable within the constraints associated with the availability of different types of fuel, which may be impacted by the energy policy of the Member State | |
| Co-benefit from techniques primarily used to reduce emissions of other pollutants | |||
| d. | Electrostatic precipitator (ESP) | See descriptions in Section 8.5. The techniques are mainly used for dust control | Generally applicable |
| e. | Bag filter | ||
| f. | Dry or semi-dry FGD system | See descriptions in Section 8.5. The techniques are mainly used for SOX, HCl and/or HF control | |
| g. | Wet flue-gas desulphurisation (wet FGD) | See applicability in BAT 25 | |
The BAT-associated emission level (BAT-AEL) for mercury emissions to air from the combustion of solid biomass and/or peat is < 1–5 μg/Nm3 as average over the sampling period.