FIELD: veterinary medicine; sanitary; environment control. SUBSTANCE: method involves treating sewage with activated sludge in aerotank. Preliminarily activated sludge is treated in the amount of 0.00001-0.00002% from the total quantity with N-nitroso-N-methylurea at 0.05% concentration. It is cultured in thinned sewage before its being introduced into the aerotank. The preliminarily activated sludge is treated with a mutagen during 3-3.5 h and cultured during 10-12 h. EFFECT: high level of sewage decontamination. 2 cl, 1 tbl
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