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Evaluation of Bromate Formation Pathway by Ozonation in Domestic Raw Waters  

Lee, Kyung-Hyuk (한국수자원공사 수자원연구원 상하수도연구소)
Lim, Jae-Lim (한국수자원공사 수자원연구원 상하수도연구소)
Park, Sang-Yeon (연세대학교 환경공학과)
Kim, Seong-Su (한국수자원공사 수자원연구원 상하수도연구소)
Kang, Joon-Wun (연세대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.6, 2006 , pp. 905-910 More about this Journal
Abstract
In order to evaluate the optimum operation condition of ozonation to minimize bromate formation, based on the NOM characteristics of raw waters, the pathway of bromate formation by ozonation in domestic raw waters was investigated. Considering the bromate formation reactions, the fractions of bromate formation from bromide by OH radical and molecular ozone were calculated with measured values of ozone decay rate ($k_c$) and Rct. The results showed that molecular ozone is more important role in the formation of bromate in domestic raw waters than OH radical. The ratio of bromide oxidation reaction by molecular ozone ranged 73~88%. Fractions of $HOBr/OBr^-$ reaction with both molecular ozone and OH radical were also determined. OH radical reaction with $HOBr/OBr^-$ was dominant. The differential equations based on the stoichiometry of bromate formation were established to predict the formation rate of bromate by ozonation. The results shows good correlation with experimental results.
Keywords
Bromate; Ozonation; OH radical;
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