Division BAT 76: In order to reduce emissions to air of organic compounds (including halogenated compounds), HCl and Cl2, BAT is to treat the combined waste gas streams from EDC and/or VCM production by using a thermal oxidiser followed by two-stage wet scrubbing.
United Kingdom
Description:
For the description of thermal oxidiser, wet and caustic scrubbing, see Section 12.1. Thermal oxidation can be carried out in a liquid waste incineration plant. In this case, the oxidation temperature exceeds 1 100 °C with a minimum residence time of 2 seconds, with subsequent rapid cooling of exhaust gases to prevent the de novo synthesis of PCDD/F.
Scrubbing is carried out in two stages: Wet scrubbing with water and, typically, recovery of hydrochloric acid, followed by wet scrubbing with caustic.
Table 10.2
BAT-AELs for emissions of TVOC, the sum of EDC and VCM, Cl2, HCl and PCDD/F to air from the production of EDC/VCM
| Parameter | BAT-AEL(daily average or average over the sampling period)(mg/Nm3, at 11 vol-% O2) |
|---|---|
| TVOC | 0,5–5 |
| Sum of EDC and VCM | < 1 |
| Cl2 | < 1–4 |
| HCl | 2–10 |
| PCDD/F | 0,025–0,08 ng I-TEQ/Nm3 |
The associated monitoring is in BAT 2.