FIELD: purifying, rendering harmless, and reutilizing industrial fluids. SUBSTANCE: method consists in incorporation into mud of an inorganic coagulant, separation of sediment, and treatment of the latter with alkali solution, amounts of inorganic coagulant and alkali being taken, respectively, 0.3-0.5 and 0.1-0.15 wt parts per 1 wt part of polymer in the drilling mud. EFFECT: improved procedure. 2 tbl
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