title: Energy-positive nitrogen removal from reject water using a tide-type biocathode microbial electrochemical system.
abstract: A tide-type biocathode microbial electrochemical system (TBMES) employing intermittent air accessible method was constructed for simultaneous carbon and nitrogen removal. The nitrification and denitrification processes occurred in cathode chamber were enhanced by raising frequency of catholyte feeding-draining process and lowering external resistance. At external resistance of 5Ω and frequency of 8cph, the TBMES removed 99.3±0.3% of COD and 57.7±1.1% of total nitrogen when treating synthetic medium with COD/N ratio of 3.0, concomitantly, a maximum power density of 10.6Wm-3was achieved. Comparable performances were obtained for reject water treatment with a relatively lower COD/N ratio of 2.5, which were 88.6±1.3%, 53.2±3.8% and 8.9±0.2Wm-3for COD removal, total nitrogen removal and maximum power density. The feeding-draining process consumed 14.3% of the total energy produced, and thus obviated energy-intensive aeration and achieved net energy output.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Haiman
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China. Electronic address: ablesee@163.com.
authors.forename: Weihua
authors.initials: W
authors.lastname: He
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China; School of Life Science and Technology, Harbin Institute of Technology, No. 2 Yikuang Street, Nangang District, Harbin 150080, China.
authors.forename: Youpeng
authors.initials: Y
authors.lastname: Qu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Da
authors.initials: D
authors.lastname: Li
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Feng
mesh_terms: D001674:Bioelectric Energy Sources; D057919:Biological Oxygen Demand Analysis; D002244:Carbon; D058440:Denitrification; D004560:Electricity; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004583:Electrons; D058465:Nitrification; D009584:Nitrogen / Q000302:isolation & purification*; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology; D014867:Water / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D002244:Carbon; D009584:Nitrogen; D062065:Wastewater; D014867:Water
keywords: Carbon and nitrogen removal; Intermittent air access; Net energy production; Reject water; Tide-type biocathode microbial electrochemical system (TBMES)