FIELD: water treatment. SUBSTANCE: reagent, possessing both flocculant and coagulant properties, is prepared by radical polymerization of acrylamide dissolved in aluminum hydroxochloride at acrylamide-to-aluminum hydroxochloride solution weight ratio (0.033-0.533): 1 in presence initiation system containing hydroxyalkyl tert-butyl peroxide and ferrous ions at their concentrations in aluminum hydroxochloride solution 0.692-1.022 and 0.0072-0.096 wt %, respectively. EFFECT: simplified preparation procedure and reduced water treatment time. 3 tbl, 12 ex
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