FIELD: chemistry.
SUBSTANCE: wastewater treatment is carried out in the aerotank. The active sludge is separated from the purified water in the secondary settler. The circulating active sludge is supplied after precipitation in the secondary settler into the aerotank. The excess active sludge is removed to the sewage sludge treatment facilities in an amount of 1/60-1/100 of the total sludge mass in the aerotank and the secondary settler per day.
EFFECT: volume reduction of the excess active sludge while improving the quality of purified water by chemical oxygen consumption, biochemical oxygen demand and nitrogen compounds.
3 cl, 1 tbl, 2 dwg
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