FIELD: waste water treatment. SUBSTANCE: glass-fiber tank without compartments contains collector with primary stream equalizing. Collector is surrounded by cylindrical barrier which virtually eliminates hydraulic turbulence and forms a pre-settling zone. A new type of floating decanter is provided as well as programmable electronic circuit including aeration time, liquid level, and decantation process control. EFFECT: increased purity of treated supernatant. 12 cl, 4 dwg
