METHODS OF BIOLOGICAL TREATMENT OF SEWAGE WATERS AND TREATMENT OF SLUDGES Russian patent published in 2000 - IPC

FIELD: treatment of sewage waters and their sludges with microorganisms; applicable in biological treatment of municipal and industrial sewage waters from organic impurities, nitrogen compounds and for stabilization of sludges. SUBSTANCE: flow of sewage waters is divided into two flows, one of which not exceeding in value of hourly average flow rate of sewage waters is directed to multistage aerobic bioreactor operating on community of freely floating and fixed microorganisms. During hours when sewage water flow rate exceeds hourly average one, its excessive part enters multistage aerobic mineralizer, and after sludge separation, sewage waters together with sludge water are supplied to aerobic bioreactor. Stabilized sludge from aerobic mineralizer is withdrawn for dewatering not earlier than in 6 h after stopping of supply of sewage waters. EFFECT: reduced volumes of aerobic bioreactors and air consumption for treatment of volume unit of nonuniformly supplied sewage waters, increased degree of decomposition of ashless matter of sludge. 3 cl, 5 dwg, 3 tbl, 1 ex