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http://dx.doi.org/10.17820/eri.2018.5.3.111

Inactivation of Indicating Microorganisms in Ballast Water Using Chlorine Dioxide  

Park, Jong-Hun (Department of Civil, Environmental and Architectural Engineering, Korea University)
Sim, Young-Bo (School of Civil and Environmental Engineering, Yonsei University)
Kang, Shin-Young (Department of Environmental Engineering, Daegu University)
Kim, Sang-Hyoun (School of Civil and Environmental Engineering, Yonsei University)
Publication Information
Ecology and Resilient Infrastructure / v.5, no.3, 2018 , pp. 111-117 More about this Journal
Abstract
Disinfection of ballast water using chlorine dioxide was investigated under various initial microorganism contents, dose concentrations and pH values. Kinetics of microorganism inactivation and byproduct generation of chlorine dioxide treatment were compared with the chlorine treatment. Results of treatments with chlorine dioxide concentrations of 0 to $10mg\;Cl_2/L$ showed that The optimum concentration of chlorine dioxide required for disinfection of ballast water was 1 mg/L. The difference among the second order reaction constants for bacterial disinfection at pH 7.2 to 9.2 for chlorine dioxide was less than 5% for both bacteria. This result implied that the bactericidal effects of chlorine dioxide was independent of the pH in the examined range. On the other hand, the inactivation kinetics of chlorine for E. coli and Enterococcus decreased by 17% and 25%, respectively, when pH increased from 7.2 to 9.2. The bactericidal power of chlorine dioxide was superior to sodium hypochlorite above pH 8.2, the average pH value of sea water. Furthermore, treatments of chlorine dioxide generated less harmful byproducts than chlorine and had a long-term disinfection effect on bacteria and phytoplankton from the results of experiment for 30 days. Chlorine dioxide would be a promising alternative disinfectant for ballast water.
Keywords
Bacteria; Byproducts; Disinfection; pH; Phytoplankton;
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