화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.30, No.2, 379-384, February, 2013
DOI10.1007/s11814-012-0139-4  Export Citation
Effect of supplying a carbon extracting solution on denitrification in horizontal subsurface flow constructed wetlands
Yi Ding1, Xinshan Song1, Yuhui Wang1, and Denghua Yan1, 2, †
  • 1College of Environmental Science & Engineering, Donghua University, No2999, Renmin North, Songjiang District, Shanghai 201620, China
  • 2China Institute of Water Resources and Hydropower Research, A-1 Fuxing Road, Beijing 100038, China
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Denitrification strongly depends on the availability of carbon source in constructed wetlands(CWs). In this study, several relevant carbon source extracting solutions made from hydrolyzate of selected wetland litters were added to CWs for nitrogen removal enhancement. The feasibility of supplying a carbon extracting solution to improve potential denitrification rate in horizontal subsurface flow constructed wetland was deeply investigated. Combinations of different hydraulic retention time (HRT, especially for 2-day and 4-day) with different influent COD/N ratios were designed to prove the enhancement on denitrification by carbon source supplement. In addition, specific denitrification rate (SDNR) was calculated for the comparison of the nitrogen removal at different COD/N ratios. The sequential operation results on total nitrogen (TN) and nitrate (NO3 ^(-)-N) removal efficiencies were obtained in CW system with an influent COD/N ratio of 4.0. The accumulation of nitrite (NO2^(-)-N) was found to be closely related to the removal of NO3^(-)N. Meanwhile, no obvious accumulation of NO2^(-)-N was found when the removal of NO3^(-)-N was relatively high.
Keywords:Carbon Extracting Solution;COD/N Ratio;Denitrification;Horizontal Subsurface Flow Constructed Wetland;Nitrogen Removal
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