SYSTEM FOR BIOLOGICAL SEWAGE WATER TREATMENT Russian patent published in 1995 - IPC

FIELD: sewage water treatment. SUBSTANCE: system is composed of aeration tank, secondary clarifier, conduit for feeding crude sewage to the aeration tank, bypass pipelines for mixed liquor and return sludge and duct for final effluent. For a new feature the system is provided with two heat exchangers positioned successively for passing crude sewage. Installed in the system are also heat pump with throttle, compressor, condenser and evaporator. The first heat exchanger is connected to the duct for final effluent after the secondary clarifier. The evaporator is attached next. The second heat exchanger is joined to the condenser via a circulating circuit. EFFECT: higher efficiency of treatment due to sewage preheating. 1 dwg