Formation of chlorite and chlorate from chlorine dioxide with Han river water |
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| Authors: | Email author" target="_blank">Yoon-jin?LeeEmail author Hea-tae?Kim Un-gi?Lee |
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| Affiliation: | (1) Department of Civil and Environment Engineering, Virginia Polytechnic Institute and State University, 24060 Blacksburg, VA, USA;(2) R&D Team, Korea Resources Recovery and Reutilization Corporation, General Environmental Research Complex, Gyungseodong, Seogu, 404-170 Incheon, Korea;(3) Department of Environment Technology, Korea Testing and Research Institute of Chemical Industry, 539-8, Kajoa-3-dong, Seogu, 404-817 Incheon, Korea |
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| Abstract: | This study was designed to elucidate the behavior of chlorine dioxide in drinking water systems. Furthermore, the factors
that influence the formation of chlorite, chlorate in terms of reaction time, concentration of chlorine dioxide, pH, temperature
and UV irradiation were experimentally reviewed. At 20 ‡C, pH 7, 70–80% of chlorine dioxide injected was converted to chlorite
and 0–10% of that was transformed into chlorate within 120 min with 2.91 mg/L of DOC. The amount of chlorite formed also increased
when pH and temperature increased. As DOC content increased, the residual chlorine dioxide decreased but the amount of chlorite
and chlorate were increased. These experiments revealed that chlorate was a dominant by-product under UV irradiation. The
models that were obtained by the regression analysis for the formation of chlorite and chlorate from chlorine dioxide with
Han River water are as follows: Chlorite (mg/L)=10-2.20ClO2]0.45pH]0.90temp]0.27TOC]1.04time]0.20, Chlorate (mg/L)=10-2.61ClO2]1.27pH]-0.50temp]1.28 TOC]0.31time]0.12 |
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| Keywords: | Chlorine Dioxide Chlorite Chlorate Disinfection Factors |
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