Characterization of chlorine dioxide as disinfectant for the removal of low concentration microcystins |
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Authors: | Mingsong Wu Junli Huang Yuling Zhang Shijie You Shaofeng Li Zhilin Ran Yu Tian |
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Institution: | 1. Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology, Harbin 150090, China; 2. College of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China; 3. Department of Architecture Engineering, Shenzhen Polytechnic Institute, Shenzhen 518055, China |
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Abstract: | Microcystins, which represents one kind of cancerogenic organic compounds, is abundant in eutrophication water. The effects of reaction factors on chlorine dioxide (ClO2) for removal of low-concentration Microcystin-LR, Microcystin-RR, and Microcystin-YR in water as well as the reaction mechanisms was investigated by using enzyme-linked immunosorbent assay (ELISA) kit and gas chromatography–mass spectrometry (GC-MS). The results showed that MC-LR, MC-RR, and MC-YR could be efficiently decomposed by ClO2. The degradation efficiency was shown positively correlated to the concentration of ClO2 and reaction time; while the effect of reaction temperature and pH is slight. The kinetic constants and activation energies of the reaction of MC-LR, MC-RR, and MC-YR with ClO2 are determined as 459.89, 583.15, 488.43 L·(mol·min)-1 and 64.78, 53.01, 59.15 kJ·mol-1, respectively. As indicated by high performance liquid chromatography mass spectrometer (HPLC-MS) analysis, degradation should be accomplished via destruction of Adda group by oxidation, with the formation of dihydroxy substituendums as end products. This study has provided a fundamental demonstration of ClO2 serving as oxidizing disinfectant to eliminate microcystins from raw water source. |
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Keywords: | disinfection chlorine dioxide microcystins reaction mechanism |
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