Division BAT 45: In order to reduce emissions of organic compounds to air from formaldehyde production and to use energy efficiently, BAT is to use one of the techniques given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| a. | Send the waste gas stream to a combustion unit | See BAT 9 | Only applicable to the silver process |
| b. | Catalytic oxidiser with energy recovery | See Section 12.1. Energy is recovered as steam | Only applicable to the metal oxide process. The ability to recover energy may be restricted in small stand-alone plants |
| c. | Thermal oxidiser with energy recovery | See Section 12.1. Energy is recovered as steam | Only applicable to the silver process |
Table 5.1
BAT-AELs for emissions of TVOC and formaldehyde to air from formaldehyde production
| The lower end of the range is achieved when using a thermal oxidiser in the silver process. | |
| Parameter | BAT-AEL(daily average or average over the sampling period)(mg/Nm3, no correction for oxygen content) |
|---|---|
| TVOC | < 5–30f1 |
| Formaldehyde | 2–5 |
The associated monitoring is in BAT 2.
Annotations
Footnotes
- f1
-
The lower end of the range is achieved when using a thermal oxidiser in the silver process.