WASTE WATER PURIFICATION METHOD Russian patent published in 1994 - IPC

FIELD: cattle breeding and agricultural products processing. SUBSTANCE: coarse dispersion impurities are removed from waste water and waste water is kept in primary sedimentation tanks. Then waste water is subjected to treatment in aerotanks and once more is kept in sedimentation tanks. Wet sediment of primary sedimentation tanks is mixed with excessive active silt, mixture is conditioned and centrifuged, centrifugate effluent is mixed with waste water before mixture feeding into primary sedimentation tanks. In the case centrifugate effluent is separated into foam product and purified liquid and foam product is mixed with coarse dispersion impurities like manure and purified liquid is mixed with waste water (after it is separated from coarse dispersion impurities) and fed into primary sedimentation tanks. It is preferable, that centrifugate effluent is separated into foam product and purified liquid in ration of 1 : (3 -5). EFFECT: method is used for cattle and pig breeding farms waste waters purification. 2 cl, 1 tbl