FIELD: technology of sewage treatment. SUBSTANCE: method involves treatment of sewage with reagent followed by settling, biological rendering harmless in combination with nitrification and denitrification carried out in two-stage reactors with discharges recirculation in the presence of attached hydro- -coles. As reagents sewage modified deposits and flocculant are used. Reagent dose is in the direct proportion to the value of safety limited concentration of sewage. The first stage of two-stage bioreactor is nitri-denitrificator. Recirculation of sewage is carried out from outlet of the first stage of bioreactor for its inlet. EFFECT: reduced time of process of sewage treatment and energy consumption. 3 cl, 2 dwg, 3 ex
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