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A Study on the Removal Characteristics of Microcystin in the Water Treatement Plant by Ozonation  

김민규 (인제대학교 환경시스템학부)
권재현 (인제대학교 환경시스템학부)
조영하 (인제대학교 보건대학원)
이진애 (인제대학교 환경시스템학부)
권오섭 (인제대학교 환경시스템학부)
Publication Information
Journal of Environmental Health Sciences / v.29, no.1, 2003 , pp. 74-83 More about this Journal
Abstract
Microcystin, stable compounds with circular heptapeptides, is presented inside cyanobacterial cell. So far, over 30 types have been known to exist and microcystin-LR, RR among them are the most potent toxin compound. By this reason, a strong oxidant, ozone was used in this study to remove the microcystins produced by cyanobacteria. Removal efficiency of microcystin at M water treatment plant was also evaluated. Microcystin concentration was determined by protein phosphatase inhibition assay. The results showed that dissolved microcystin in raw water detected in the range of 0.011-0.028 ㎍ Microcystin-RR equivalent/l. Above 98% of microcystin was removed through overall treatment system. Therefore, the water treatability of M treatment plant seemed to be excellent. Removal efficiency of microcystin according to unit process varied as characteristics of raw water such as DOC, UV/sub 254/ and turbidity. Removal efficiency of microcystin by ozonation was investigated in laboratory according to contact time and ozone dose. Dissolved microcystin was increased by twice fold according to ozone contact time, but increased by fifth fold according to ozone dose. So, changing of ozone dose more affected microcystin release than changing of ozone contact time. Behavior of microcystin by ozonation was similar to that of DOC, and residual ozone concentration gave influence to removal ratio of microcystin. In conclusion, single ozone treatment wasn't effective on microcystin removal in case of water containing a lot of cells. Therefore, it's more effective to use ozonation process after the removal of cyanobacterial cells in advance.
Keywords
Cyanobacteria; Eutrophication; Ozonation; Microcystin; DOC; Protein phosphatase inhibition assay;
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