FIELD: purifying of sewage water, in particular, clarification of high-concentrated alkaline sewage water and waste solutions of leather, fur and other industries.
SUBSTANCE: method involves preliminarily diluting sewage water with wash or recycling water to suspended substance content of 8-15 g/l and pH value of at least 9.5, followed by coagulation and flocculation clarification, with magnesium chloride being used as coagulant in an amount of 0.2-2 g/l and polyacrylamide or sulfomethylene salt of 2-methyl 5-vinylpyridine being used as flocculant in an amount of 1-5 mg/l.
EFFECT: increased extent of purification, provision for simultaneous separation of suspended substances, increased utilization of sludge and reduced power consumption.
4 ex
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