title: High efficiency of inorganic nitrogen removal by integrating biofilm-electrode with constructed wetland: Autotrophic denitrifying bacteria analysis.
abstract: The constructed wetland coupled with biofilm-electrode reactor (CW-BER) is a novel technology to treat wastewater with a relatively high level of total inorganic nitrogen (TIN) concentration. The main objective of this study is to investigate the effects of C/Ns, TIN concentrations, current intensities, and pH on the removal of nitrogen in CW-BER; a control system (CW) was also constructed and operated with similar influent conditions. Results indicated that the current, inorganic carbon source and hydrogen generated by the micro-electric field could significantly improve the inorganic nitrogen removal with in CW-BER, and the enhancement of average removal rate on NH3-N, NO3-N, and TIN was approximately maintained at 5-28%, 5-26%, and 3-24%, respectively. The appropriate operation conditions were I=10mA and pH=7.5 in CW-BER. In addition, high-throughput sequencing analysis implied that the CW-BER reactor has been improved with the relative abundance of autotrophic denitrifying bacteria (Thiobacillus sp.).
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: yhwang@dhu.edu.cn.
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environment, Beijing Normal University, Beijing 100038, China.
authors.forename: Junhong
authors.initials: J
authors.lastname: Bai
authors.affiliation: State Key Laboratory Hydroscience and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Zhaowei
authors.initials: Z
authors.lastname: Liu
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: 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: Dengming
authors.initials: D
authors.lastname: Yan
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: Asaminew
authors.initials: A
authors.lastname: Abiyu
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: Zhimiao
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: China Institute of Water Resource and Hydropower Research, Beijing 100038, China.
authors.forename: Denghua
authors.initials: D
authors.lastname: Yan
mesh_terms: D052818:Autotrophic Processes; D001419:Bacteria; D018441:Biofilms; D019149:Bioreactors / Q000382:microbiology*; D058440:Denitrification; D004566:Electrodes; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D053833:Wetlands
chemical_list: D009584:Nitrogen; D062065:Wastewater
keywords: Autotrophic denitrifying bacteria; Biofilm-electrode reactor; Constructed wetland; Current intensity; Inorganic nitrogen removal