Characterization and risk management of perchlorate formation related to drinking water treatment process

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Perchlorate is known to interfere with iodine uptake. It has been detected in source water and drinking water. During water treatment process, perchlorate was not produced in ozonation, but it was increased by addition of sodium hypochlorite solution or on-site generated hypochlorite. Perchlorate concentration was increased during electrolysis generation and storage. Perchlorate generation in treatment process should be controled by suppression of chlorate generation. Six electrodes of different property (a:Ru/Ti, b:Ru/Ir/Ti,c:Ir/Sn,d:Ir/Pt,e:Pt,and f:Pb) were tested. When electric current is constant, those electrodes of higher oxygen hyper voltage showed higher electric voltage, lower production of hypochlorite, and higher generation of chlorate and perchlorate.