FIELD: paint-and varnish-containing sewage treatment. SUBSTANCE: zinc-and-phosphate sludge (wastes) and the additive of polyacrylamid as a processing gel are introduced into a composition for preparing a coagulant. The composition as a whole has the following components, mas. % : zinc-and-phosphate sludge 15-20; nitric acid 20-26; boric acid 0.3-0.5; triethanolamine 1-3; polyacrylamid 1; water - the remainder. EFFECT: improved quality of purification. 2 tbl
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RU2011553C1 |
