FIELD: biological treatment of sewage. SUBSTANCE: in the upper part of aeration tube a nozzle with an air pipe is coaxially installed to form a ring slit between the housing of nozzle and the wall of aeration tube. Two air flows are ejected: one through the air pipe of nozzle, the second through the ring slit, aeration taking place as deep as the full depth of the air tank. EFFECT: higher efficiency. 1 dwg
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