FIELD: chemical industry. SUBSTANCE: method comprises stages of biochemical nitrification and denitrification to adjust pH at not lower than 6.5-7.0 in nitrification stage. The desired pH is adjusted in nitrification stage by introducing desired amount of nitrate and/or nitrite compounds into sewage. Nitrate and/or nitrite compounds are added as aqueous solutions. Method makes it possible to obtain high degree of sewage purification to remove ammonium nitrogen without using alkali agents. EFFECT: more efficient purification method. 2 cl, 2 ex
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