Abstract
Removal of perchlorate from drinking water in an ion exchange membrane bioreactor (IEMB) was investigated at different influent ClO4- concentrations when the hydraulic retention time was 5h. Except the 49th day and the 51st day, the effluent ClO4- concentrations met standard of the U.S. Environmental Protection Agency (USEPA) required 18µg/L. In the initial stages of the influent ClO4- concentration increase, the ClO4- concentration in the anaerobic bioreactor, the effluent Cl- concentration and the effluent electrical conductivity increased suddenly. As the operating time increased, the ClO4- concentration in the sludge supernatant kept below 10µg/L after steady operation; the effluent Cl- concentration declined slowly and finally stabilized at about 90 mg/L; the effluent electrical conductivity decreased gradually and finally stabilized at about 279µs/cm.
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