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DBPs Variation by Chlorination and Preozonation in Drinking Water  

Kim, Junsung (Department of Civil and Environmental Engineering, University of Massachusetts)
Choi, Yongwook (Department of Environmental System Engineering, Jeonju University)
Chung, Yong (Department of Preventive Medicine and Public Health, College of Medicine Yonsei University)
Publication Information
Journal of Korean Society on Water Environment / v.21, no.6, 2005 , pp. 676-681 More about this Journal
Abstract
This study was researched for disinfection by-products (DBPs) by preozonation, prechlorination and/or postchlorination. DBPs including trihalomethanes (THMs), haloacetic acids (HAAs), halonitriles, and aldehydes were analyzed by the treatment steps of prechlorination, preozonation, sedimentation, filtration, and postchlorination comparatively. THMs were detected as $52.20{\mu}g/L$ after prechlorination and decreased during sedimentation and filtration process. The HAAs and aldehydes increased more during preozonaiton than prechlorination. However, chlorinated DBPs and aldehydes increased more by postchlorination. Chlorinated DBPs formed by preozonation increased 26% more than the chlorination process. If aldehydes were included in the total DBPs, DBPs increased up to 39% by preozonation. Preozonation could increase the removal efficiency of organic carbon during the coagulation and sedimentation processes. Ozonation might produce aldehydes that are not permitted for drinking water regulations. Also, DBPs were produced by preozonation than by chlorination. These results would bring a need for alternative disinfection studies to decrease DBPs.
Keywords
Preozonation; Chlorination; Disinfection by-products; Aldehydes; Trihalomethanes (THMs);
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