FIELD: waste water treatment. SUBSTANCE: waste water is subjected to primary settling, activated sludge treatment in air tanks, and secondary settling. Recycled activated sludge, after secondary settling and before treatment in air tanks, is aerated with oxygen-containing mixture by immersing aerator either directly into the sludge stream in line or into recycling activated sludge chamber, oxygen residence time in sludge mixture being controlled. EFFECT: reduced power consumption and improved purification quality. 3 cl, 1 dwg
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