FIELD: waste water treatment. SUBSTANCE: invention relates to cleaning and processing oil-containing waste waters and oil sludges, in particular reusing petroleum products recovered from waste waters, liquid and viscous oil sludges. Trapped oil with up to 10% water content is heated in furnace to 325- 385 C and then separated in rectification column into gasoline, diesel, and residual fractions under pressure 0.15 to 0.5 MPa depending on water content, said trapped oil being recovered from waste water or oil sludge and pretreated in disperser to form homogenous water-oil emulsion with drop size no larger than 30 mcm. EFFECT: enabled processing of trapped oil with water content up to 10% without preliminary settling, increased commercial product output from 15 to 100 rel %, reduced pollution, and improved environmental condition. 2 cl, 1 tbl, 5 ex
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