Division BAT 8 In order to prevent and reduce ammonia (NH3) emissions to air when applying selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR) techniques, BAT is to maintain suitable operating conditions of the SCR or SNCR waste gas treatment systems, with the aim of limiting emissions of unreacted NH3.
United Kingdom
BAT-associated emission levels: See Table 2.
Table 2
BAT-associated emission levels for ammonia (NH3) emissions to air for a combustion or process unit where SCR or SNCR techniques are used
| The higher end of the range is associated with higher inlet NOX concentrations, higher NOX reduction rates and the ageing of the catalyst. | |
| The lower end of the range is associated with the use of the SCR technique. | |
| Parameter | BAT-AELz(monthly average)mg/Nm3 |
|---|---|
| Ammonia expressed as NH3 | < 5 – 15f1 f2 |
Annotations
Footnotes
- f1
-
The higher end of the range is associated with higher inlet NOX concentrations, higher NOX reduction rates and the ageing of the catalyst.
- f2
-
The lower end of the range is associated with the use of the SCR technique.