title: High-effective denitrification of low C/N wastewater by combined constructed wetland and biofilm-electrode reactor (CW-BER).
abstract: The low denitrification effect on constructed wetlands (CWs) treating low carbon to nitrogen ratio (C/N) wastewater was a problem. In this study, a novel coupled system by installing CW and biofilm-electrode reactor (CW-BER) was developed. In this system, the heterotrophic and autotrophic denitrifying bacteria all played their roles in denitrification process. The system was investigated systematically with simulated wastewater at different C/Ns, electric current intensities (I), hydraulic retention times (HRTs), and pH. Results showed that the optimum running conditions were C/N=0.75-1, I=15 mA, HRT=12 h, and pH=7.5. The highest removal efficiency of NO3-N and TN at the best conditions was respectively 63.03% and 98.11% for CW-BER. Also, the TN and NO3-N enhancive removal efficiency of CW-BER was 23.26% and 24.20%, respectively. No residual organic carbon source was detected in final effluent at the best parameters.
authors.affiliation: School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: He
authors.affiliation: School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China. Electronic address: yhwang@dhu.edu.cn.
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Xinshan
authors.initials: X
authors.lastname: Song
mesh_terms: D052818:Autotrophic Processes; D001419:Bacteria; D018441:Biofilms; D019149:Bioreactors; D002244:Carbon / Q000032:analysis* / Q000737:chemistry; D058440:Denitrification; D004566:Electrodes; D052836:Heterotrophic Processes; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods; D053833:Wetlands
chemical_list: D002244:Carbon; D009584:Nitrogen; D062065:Wastewater
keywords: Biofilm-electrode reactor; Combined reactor; Constructed wetland; Denitrification; Low C/N