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 and Yu Tian |
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Institution: | (1) Department of Chemistry and Environmental Sciences, Lake Superior State University, 650 W Easterday Ave, Sault Ste Marie, MI 49783, USA;(2) United States Environmental Protection Agency, Office of Groundwater and Drinking Water, 26 West Martin Luther King Drive, Cincinnati, OH 45268, USA |
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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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