METHOD FOR SEWAGE TREATMENT Russian patent published in 1998 - IPC

FIELD: methods of sewage treatment in agriculture, food industry, etc. SUBSTANCE: method includes ionization of sewage in the circulating circuit where sewage waters are exposed to ultrasonic effect, and further on, they are mixed with sorbent based on zeolite and/or ash of burnt peat, and/or shales, and/or dust - waste of cement production. Produced liquid fraction is homogenized, its ph is varied to at least 3 and sorbent is added and pH of liquid phase is increased up to at least 10, mixed with coagulant and/or flocculant and settled with correction of pH to normal value. Then liquid is saturated with air and exposed to ultrasonic effect under conditions of cavitation and ultraviolet radiation in continuous or pulse mode, with pulse frequency of 1-10 Hz and power density of at least 20 kW/sq.m. It makes it possible to efficiently precipitate substances dissolved in sewage and to separate the precipitated sediment from treated liquid. EFFECT: higher efficiency. 3 dwg, 13 tbl