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DOI : 10.17640/KSWST.2019.27.4.15 ,    Vol.27, No.4, 15 ~ 24, 2019
Elimination of Microcystin-LR by UV/Chlorine Oxidation Process
남숙현 Sookhyun Nam , 이주원 Joowun Lee , 김은주 Eunju Kim , 구재욱 Jaewuk Koo , 황태문 Tae-mun Hwang
Cyanobacteria blooms in waters have become a worldwide issue for drinking water production. Microcystin-LR (MC-LR), a toxic compound produced by cyanobacteria, is very toxic and poses a threat to public health. The World Health Organization has proposed a provisional guideline concentration of no more than 1.0 ㎍/L for MC-LR in drinking water. In conventional water treatment, chlorination is applied for the elimination of MC-LR, but when the influent pH is higher than 8.0, a higher chlorine dose is required, which may increase disinfection by-products. In this study, low pressure UV/chlorine oxidation precess has been evaluated for effective removal of MC-LR. MC-LR with an initial concentration of 100 ㎍/L was reduced by about 90 % under the condition of a chlorine concentration of 1.0 ㎎/L and UV dose of 200 mJ/㎠ which was much higher than 50 % removal under UV process alone and 60 % removal under chlorination alone. In UV/chlorine oxidation process, reactive chemical species such as OH radicals and chlorine radicals were involved, showing synergistic efficient than UV and chlorination alone process. These results shows the UV/chlorine is one of the effective oxidation process for MC-LR elimination.
Key Words
AOP, Chlorine, Micricystin-LR, Microcystins, UV
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