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《China Water & Wastewater》 2002-06
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Iron Removal by Electrochemical Method for Water Supply System of Buildings

WU Xing wu, GAO Ting yao (National Engineering Research Center for Urban Pollution Control, Tongji University, Shanghai 200092, China)  
A new electrochemical technology of water treatment for iron removal was proposed, which did not need any chemical agent and had no secondary pollution. The performance mechanism was electrolysis. Fe 2+ was oxidized to Fe 3+ by nascent oxygen and dissolved oxygen produced by anodic reaction (with dimensionally stable anodes), the Fe 3+ was hydrolyzed to ferric hydroxide, and then the hydrolysate was filtrated off by sand-bed filter. As pH increased due to the increase of OH - formed by cathode reaction, the oxidation rate was increased. The ferric hydrocolloid particles were flocculated into much bigger flocs by small bubbles produced during electrolysis process, so that the condition of filtration was improved. The higher the electrical charge passed per litter of water the higher the ability of iron removal, but the lower the current efficiency. The total iron content was decreased from 4.0 mg/L to ≤0.3 mg/L, under the test conditions of current density 4.0 mA/cm 2, electrical charge per litter of water ≥50 C/L (H 2O), and single - pass operation, with quartz sand media adopted. Through circulating treatment, the rusty brown water in tank was cleaned efficiently, and the electric power consumption was ≤ 0.02 (kW·h)/m 3 (H 2O). The test result showed that the circulating treatment is applicable to water supply system of urban buildings.
【Fund】: 国家自然科学基金资助项目 (5 973815 0 )
【CateGory Index】: TU821
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