METHOD FOR TREATMENT OF OIL AND SLIME-CONTAINING SEWAGE WATER AND PLANT FOR ITS REALIZATION Russian patent published in 1995 - IPC

FIELD: treatment of oil and slime-containing water. SUBSTANCE: method for treatment of oil and slime-containing sewage water includes supply of initial sewage water, preliminary cleaning from coarse impurities and removal of sediments settled in oil trap with removal of oil product and sediment, fine cleaning by filtering, dewatering of sediments of preliminary treatment and settling stage, and return of separated water and sediments of fine cleaning stage to the stage of preliminary treatment. Preliminary treatment is effected by preliminary sedimentation and subsequent treatment by hydraulic cyclone and filtration. Initial water is periodically mixed with circulating preliminarily treated water flows. Carried out in the first flow is separation of total sediments, and in the other flow, effected is surface gathering of oil products, their settling from water returned to the first cycle, and separation of oil products for their utilization. Sediments of settling stage is returned to the stage of preliminary sedimentation. The method is realized by special plant. EFFECT: higher efficiency. 4 cl, 1 dwg