Division BAT 58: In order to reduce emissions to water of organic peroxides from the oxidation unit and, if necessary, to protect the downstream biological waste water treatment plant, BAT is to pretreat waste water containing organic peroxides using hydrolysis before it is combined with other waste water streams and discharged to the final biological treatment.
United Kingdom
Description:
For the description of hydrolysis, see Section 12.2. Waste water (mainly from the condensers and the adsorber regeneration, after phase separation) is treated thermally (at temperatures above 100 °C and a high pH) or catalytically to decompose organic peroxides to non-ecotoxic and more readily biodegradable compounds.
Table 7.2
BAT-AEPL for organic peroxides at the outlet of the peroxides decomposition unit
| Parameter | BAT-AEPL(average value from at least three spot samples taken at intervals of at least half an hour) | Associated monitoring |
|---|---|---|
| Total organic peroxides, expressed as cumene hydroperoxide | < 100 mg/l | No EN standard available. The minimum monitoring frequency is once every day and may be reduced to four times per year if adequate performance of the hydrolysis is demonstrated by controlling the process parameters (e.g. pH, temperature and residence time) |