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Role of Water Current in the CROM Operation for the Water Quality Improvement of Eutrophic Reservoir  

Lee, Ju-Hwan (Department of Environmental Science, Konkuk University)
Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
Kim, Baik-Ho (Department of Environmental Science, Konkuk University)
Publication Information
Journal of Korean Society on Water Environment / v.26, no.3, 2010 , pp. 518-524 More about this Journal
Abstract
Continuous removal of organic matters (CROM) using freshwater bivalve Anodonta woodiana was operated to evaluate the effect of water current on the water quality improvement (clearance) of eutrophic lake. The CROM system comprised three treatment steps such as flow control, treatment and analysis, and operated at the two different currents ($24L\;h^{-1}$ and $48L\;h^{-1}$) with mussels at density of $312.5indiv.\;m^{-2}$ for 12 consecutive days. Water quality including suspended solids (SS) and chlorophyll-a (Chl-a) was daily measured at the same time. Results indicate that although both the system strongly decreased the concentration of SS and chl-a, a slow CROM system was more effective to diminish the SS contents than a fast CROM system; 82% and 66%, respectively (ANOVA, P<0.0001). Clearance rates, based on chl-a, were also significantly higher in a slow system than a fast system (ANOVA, P<0.0001), although the mussel mortality was conversely. In both systems, there showed a remarkable excretion of dissolved inorganic nutrients (i.e. $NH_3-N$ and $PO_4-P$), while a slow CROM system was higher than a fast system, significantly (ANOVA, P<0.0001). Therefore, it may suggest that a slow current CROM system is more suitable to maximize the efficacy of water quality improvement, but further study is needed to diminish the mortality of mussel and to reuse the nutrient released during the operation.
Keywords
CROM system; Current; Eutrophic lake; Freshwater bivalve; Suspended solids; Water quality improvement;
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Times Cited By KSCI : 6  (Citation Analysis)
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