METHOD OF SEWAGE TREATMENT FROM CHLORORGANIC COMPOUNDS Russian patent published in 1994 - IPC

FIELD: sewage treatment. SUBSTANCE: sewage treatment is effected in two stages: in the first stage - by the method of distillation in a tower by supplying compressed air to its bottom part through a circular bubbler with perforated holes with guides, having a slope of 60 to 70 C to the radius of the tower, at a pressure of 0.5 to 0.6 MPa and flow rate of 10-15 m³ per 1 m³ of sewage, and by supplying 130-150 kg/m³ of sewage steam through the other circular bubbler at a pressure of 0.12 to 0.17 MPa and temperature of 115 to 120 C. In the first stage treatment is conducted until a concentration of impurities within 20 to 40 mg/l is obtained with a subsequent condensation of the gas-steam medium in a heat exchanger and separation of the aqueous and organic phases in a phase separator. In the second stage treatment is conducted by the method of membrane separation by passing water partially treated in the first stage through cored polymeric film membranes with a porosity of 22 to 25% at a pressure deferential within 0.08 to 0.09 MPa and rate of 8·10³ l/m². The diameter of pores is selected depending on the kind of chlororganic compounds. Contaminated sewage, before it is delivered to the distilling tower, is heated in the heat exchanger to a temperature of 60 to 70 C by the gas-steam medium withdrawn from the distilling tower. To provide reliable operation of the second stage of treatment, sewage is cleaned of impurities in a fine filter. The method makes it possible to obtain a residual concentration of impurities in sewage within 0.01 to 0.02 mg/l. EFFECT: facilitated procedure. 3 cl, 1 tbl, 1 dwg