title: Nitrate removal and bioenergy production in constructed wetland coupled with microbial fuel cell: Establishment of electrochemically active bacteria community on anode.
abstract: The constructed wetland coupled with microbial fuel cell (CW-MFC) systems operated at different substrate concentration and pH influents were evaluated for bioelectricity generation, contaminant removal and microbial community structure. Performance of CW-MFC was evaluated at organic loading rate of 75.3gCODm-3d-1and pH gradients of (5.18±0.14, 7.31±0.13, and 8.75±0.12) using carbon fiber felt as electrodes. Peak power density was observed at slightly neutral influent condition. Compared with the open circuit CW-MFC, average COD and NO3-N removal efficiency in CW-MFC increased by 8.3% and 40.2% respectively under slightly neutral pH of influents. However, the removal efficiency and bioenergy production have been inhibited with acidic influents. The relative abundance of beta-Proteobacteria, nitrobacteria and denitrifying bacteria was significantly promoted in closed-circuit CW-MFC. Using of CW-MFC as a biochemical method for nitrate removal and bioelectricity generation under slightly neutral and alkaline influent conditions was a promising technology.
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Wang
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China. Electronic address: newmountain@dhu.edu.cn.
authors.forename: Xinshan
authors.initials: X
authors.lastname: Song
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors.forename: Befkadu
authors.initials: B
authors.lastname: Abayneh
authors.affiliation: College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
authors.forename: Yihao
authors.initials: Y
authors.lastname: Li
authors.affiliation: China Institute of Water Resource and Hydropower Research, Beijing 100038, China.
authors.forename: Denghua
authors.initials: D
authors.lastname: Yan
authors.affiliation: School of Environment, Beijing Normal University, Beijing 100038, China.
authors.forename: Junhong
authors.initials: J
authors.lastname: Bai
mesh_terms: D001419:Bacteria; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D058440:Denitrification; D004566:Electrodes; D009566:Nitrates / Q000737:chemistry*; D018508:Water Purification / Q000379:methods; D053833:Wetlands
chemical_list: D009566:Nitrates
keywords: Bacterial community structure; Closed circuit; Open circuit; Substrate concentration; Wastewater treatment; pH