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Performance Study on Pilot-scale Constructed Wetlands in order to Restore Contaminated Stream  

Kim, Seung-Jun (Water Environment and Remediation Research Center, Korea Institute of Science and Technology)
Choi, Yong-Su (Water Environment and Remediation Research Center, Korea Institute of Science and Technology)
Bae, Woo-keun (Department of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.3, 2006 , pp. 546-556 More about this Journal
Abstract
The purpose of this study is to improve the polluted stream water quality by pilot-scale five different constructed wetlands (CWs). Cell 1 to 3 are newly designed 2SFCW (Surface-subsurface flow CW) with 1 to 3 flow shifters (FS) in the middle of the wetland system. Cell 4 and 5 are control CW (CCW), but Cell 5 is the same type as Cell 3. The FS, which converts the route of surface and subsurface flow between two wetlands connected in series, was able to enhance the treatability of TN via nitrification and denitrification and of SS due to filtration and sedimentation. The void fraction and dispersion number of Cell 1, 2 and 3 obtained from the RTD analysis were found to be 0.73 and 0.17, respectively. COD and TP removal efficiencies of Cell 1 to 3 were similar to that of Cell 4 and 5. SS removal efficiencies of Cell 1 to 3 and 5 with FS were 5-10% higher than that of Cell 4 without FS. TN removal efficiencies of Cell 1 to 3 were 3-14% higher than that of Cell 4 and 5. The average $R^2$ values of COD, SS, TN and TP obtained from nonlinear regression analysis were similar to the results of other researchers.
Keywords
Flow shifter; Hydraulic loading rate; Residence time distribution; Stream; Surface-subsurface constructed wetland;
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