FIELD: waste water treatment. SUBSTANCE: original waste water is aerated in presence of activated sludge and oxygen- containing gas. Resultant sludge mixture is transferred into clarification stage whence a part of sludge is returned into aeration stage and clarified water is directed into gas-saturation stage using gas leaving aeration stage. Oxygen-saturated water is then introduced into biosorption stage whence a part of water recycles to clarified water gas-saturation stage using gas leaving sludge mixture aeration stage and a part of gas leaving saturation stage enters recycling- water pipeline. On achieving purification degree 99.0-99.7% according biochemical oxygen demand method, water is withdrawn from the plant. EFFECT: improved purification degree. 1 dwg
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