METHOD OF SEWAGE TREATMENT FROM HEAVY METAL IONS Russian patent published in 1995 - IPC

FIELD: sewage treatment. SUBSTANCE: proposed method ensures to treat the sewage of galvanic manufactures from toxic metal ions, for example, nickel, iron, copper and zinc by combination of electrochemical (electro- or galvanocoagulating) and flotation procedures. To increase extraction degree and treatment rate of water from toxic metal ions treatment is carried out successively in coagulators and pneumatic column flotation machine with pulsating aerator. Flotation reagent: 2-5% aqueous solutions of the following composition, wt. -% Na-soaps of synthetic fatty acids of fraction above C₂₁ 85-95 and alcohols of pyrane and dioxane order 5-15. Method ensures to increase the rate of flotation treatment up to 2-3 min, decrease reagent consumption by 2-3 times and provide water treatment from ions of nickel, iron, copper and zinc up to 98-100% EFFECT: improved method of sewage treatment. 2 tbl