METHOD OF TREATING NATURAL WATERS Russian patent published in 1998 - IPC

FIELD: WATER TREATMENT. SUBSTANCE: method is designed for removing various impurities from natural water, clarifying it, and further utilizing it as drinking water. Method is also applicable for return and waste waters. Water is first freed of suspended particles and then subjected to electrocoagulation using steel or steel- aluminum anodes at current density 2 to 60 A/sq. m. After electrocoagulation, sediment is settled down, separated from clarified water and combined with original water before electrocoagulation at volume ratio from 1:50 to 1:500, respectively. Clarified water is filtered and treated on diaphragmless electrolyzer with insoluble electrodes. Integrated electrodes consist of steel and aluminum in ratio 6:1. Sediment destined to be combined with water contains 10-15% of solid phase and is appropriate to treat water for 1 to 10 days after its separation. EFFECT: reduced power consumption and equipment cost due to using less expensive anodes. 4 cl, 1 dwg, 4 tbl