FIELD: chemistry.
SUBSTANCE: for sewage treatment with activated sludge in the aerotank, the anaerobic zone of the aerotank is combined with the fermentation process of the sediment, i.e. the production of volatile fatty acids. At the same time, the "ripening" zone is removed from the aerotank and is located in the primary settling tanks.
EFFECT: method ensures an absolute fermentation and reducing odour of sewage sludge, deep removal of organic matter and nutrients from sewage.
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