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Analysis of Treatment Efficiency according to Open-water in Constructed Wetland  

Kim, Hyung-Chul (Department of Environmental Science, Konkuk University)
Yoon, Chun-Gyeong (Department of Environmental Science, Konkuk University)
Um, Han-Yong (Rural Research Institute)
Kim, Hyung-Jung (Rural Research Institute)
Haam, Jong-Hwa (Rural Research Institute)
Publication Information
Journal of Korean Society on Water Environment / v.24, no.6, 2008 , pp. 709-717 More about this Journal
Abstract
The field scale experiment which is constructed with four sets (0.88 ha for each set) of wetland (0.8 ha) and pond (0.08 ha) systems was performed to examine the effect of plant coverage on the constructed wetland performance and to recommend the optimum development and management of macrophyte communities. After six growing seasons of wetlands, plant coverage was about 100%. And the concentration of DO showed low value (1.0~5.4 mg/L). This is caused by a blighted plant consumed dissolved oxygen with decay in water column. As the result, water column went to be anaerobic conditions and T-N removal rate are 58~67%. Dead vegetation increased nitrogen removal during winter because it is a source of organic carbon which is an essential parameter in denitrification. However, wetland released phosphorus caused by a blighted plant and accumulation, the removal rate of phosphorus might be decreased. To rise of DO concentration, the three open-waters were constructed in cell 3 and 4. Cell 3 has two open-waters (width 10 m, depth 1.8 m) and cell 4 has one open-water (width 20 m, depth 1.8 m). As the result, DO concentration and treatment efficiency of nutrient and BOD were improved. In case that constructed wetland is operated for a long time, physical circulation structure such as open water help continuous circulation of aerobic and anaerobic conditions. Through the constructed open-water, treatment efficiency of phosphorus and nitrogen in wetland could be improved effectively.
Keywords
Denitrification; Open water; Organic carbon; Vegetation cover; Wetland;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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