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Removal of Geosmin Forming Alga (Anabaena macrospora) by Copper Sulfate  

Park, Jae-Chung (Andong Dam Office, Korea Water Resources Corporation)
Park, Jae-Bum (Changwon Regional Office, Korea Water Resources Corporation)
Song, Sung-Il (Northern Nakdong River Regional Water Quality Analysis Center, Korea Water Resources Corporation)
Kim, Hyun-Suk (Southern Nakdong River Regional Water Quality Analysis Center, Korea Water Resources Corporation)
Park, Jung-Won (Department of Biology, Kyungpook National University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.3, 2006 , pp. 521-526 More about this Journal
Abstract
We have studied the possibility of removing Anabaena macrospora by injecting copper sulfate ($CuSO_4{\cdot}5H_2O$) into the raw water of a drinking water purification plant. Anabaena macrospora caused the unpleasant geosmin odor of drinking water in August 2001. The cell break-point of A. macrospora was 0.3 mg/L of $CuSO_4$. We were able to reduce the standing crops of A. macrospora effectively because $CuSO_4$ could break A. macrospora selectively. Because 0.3 mg/L of $CuSO_4$ could break both cells and akinetes, it reduced the possibility of a recurrent problem for them to meet a favorable condition. When $CuSO_4$ was injected in the early growth phase of algae and the mixing intensity was high, A. macrospora could be removed most effectively. The odor caused by A. macrospora was sustained for a while without any sudden change of environmental condition. Therefore, we hope that it could shorten the period of obstacle by injecting the optimal amount of 0.3 mg/L of $CuSO_4$. The water quality, alkalinity, conductivity, hardness and pH didn't changed by the injection of $CuSO_4$.
Keywords
Anabaena macrospora; $CuSO_4$; Drinking water; Geosmin; Water purification plant;
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