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KMID : 1024520170260030401
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Journal of the Environmental Sciences
2017 Volume.26 No. 3 p.401 ~ p.410
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Management of Organic Matters by Constructed Treatment Wetlands during Rainfall Events
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Lee Sang-Pal
Park Je-Chul
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Abstract
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This study analyzed the changes in the concentrations of organic matters in constructed treatment wetlands, coming from discharge water from a sewage treatment plant and non-point pollutant sources during rainfall events. At the beginning of a rainfall event, a massive amount of particulate organic matter flowed in, and was removed from the sedimentation basin (S1, S2); dissolved organic matter was removed after passing through stepwise treatment processes in the wetland. During dry period in the wetland, the removal efficiency rate for COD and TOC was -21 and -7%, respectively; during the rainfall event, the removal efficiency rate for COD and TOC were 47 and 43%, respectively. The highly-concentrated organic matters that flowd in at the beginning of the rainfall event was stabilized by various structures in the wetland before water discharge. Cyanobacteria blooms annually at the confluence of the So-ok stream and Daecheong Lake. Therefore, it is expected that the wetland will contribute significantly to reducing cyanobacteria and improving water quality in the area.
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KEYWORD
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Constructed wetland, Rainfall, Organic matter, Total organic carbon
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