FIELD: waste water treatment. SUBSTANCE: waste water containing petroleum derivatives, for example spent lubricating fluids, is passed through filter filled with adsorption complex. The latter consists of hard ferrite spheres with prevailing diameter 8-10 mm, which are constant magnets, granules, and powder of fired galvanic sludge (basically gamma-iron oxide) with particle diameter no larger than 100 mcm. Indicated components are mixed at weight ratio 8:2:1. Granules and powder of gamma-iron oxide are adsorbents and demulsifiers retained by magnetic field on surface of hard ferrite spheres. EFFECT: increased treatment efficiency and reduced power consumption. 3 cl, 1 tbl
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