A major sewage cleaning plant in the southern part of Denmark is a recipient of industrial sewage from a major fish meal industry. Severe nitrification inhibition and toxicity was observed in scrubber water from an incineration of process air, and the processes that lead to the production were stopped. In order to investigate the relation between incineration temperatures and the production of inhibitory compounds and toxicity, the process air was burned at temperatures from 800°C to 1000°C. The termically affected condensate was collected and the nitrification inhibition effect and toxicity of the condensate was tested. The investigation showed that it is possible to reduce the nitrification inhibition effect and toxicity considerably by raising the incineration temperature from 800°C to 850°C and in some cases to 900°C. The investigation also showed that a further rise in the temperature beyond 850°C and in some cases 900°C, is unnecessary.
|Effective start/end date||01/07/2003 → 01/07/2009|
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