title: Self-powered denitration of landfill leachate through ammonia/nitrate coupled redox fuel cell reactor.
abstract: In order to explore the feasibility of energy-free denitrifying N-rich wastewater, a self-powered device was uniquely assembled, in which ammonia/nitrate coupled redox fuel cell (CRFC) reactor was served as removing nitrogen and harvesting electric energy simultaneously. Ammonia is oxidized at anodic compartment and nitrate is reduced at cathodic compartment spontaneously by electrocatalysis. In 7.14 mM ammonia+0.2M KOH anolyte and 4.29 mM KNO3+0.1M H2SO4 catholyte, the nitrate removal efficiency was 46.9% after 18 h. Meanwhile, a maximum power density of 170 mW m(-2) was achieved when applying Pd/C cathode. When NH4Cl/nitrate and ammonia/nitrite CRFCs were tested, 26.2% N-NH4Cl and 91.4% N-NO2(-) were removed respectively. Nitrogen removal efficiency for real leachate at the same initial NH3-N concentration is 22.9% and nitrification of ammonia in leachate can be used as nitrate source. This work demonstrated a new way for N-rich wastewater remediation with electricity generation.
authors.affiliation: Department of Environmental Engineering, East China Jiaotong University, China; State Key Laboratory of Clean Energy Utilization, Laboratory for Electrochemistry and Energy Storage, Zhejiang University, Hangzhou 310027, China.
authors.forename: Huimin
authors.initials: H
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Clean Energy Utilization, Laboratory for Electrochemistry and Energy Storage, Zhejiang University, Hangzhou 310027, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.affiliation: The Institute of Environmental Engineering, Shanghai Maritime University, Shanghai 201306, China.
authors.forename: Daolun
authors.initials: D
authors.lastname: Feng
authors.affiliation: Department of Environmental Engineering, East China Jiaotong University, China.
authors.forename: Zhanmeng
authors.initials: Z
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Clean Energy Utilization, Laboratory for Electrochemistry and Energy Storage, Zhejiang University, Hangzhou 310027, China. Electronic address: wuzc@zju.edu.cn.
authors.forename: Zucheng
authors.initials: Z
authors.lastname: Wu
mesh_terms: D000641:Ammonia / Q000737:chemistry; D001674:Bioelectric Energy Sources; D019149:Bioreactors; D058440:Denitrification; D004560:Electricity; D004566:Electrodes; D005240:Feasibility Studies; D009566:Nitrates / Q000737:chemistry; D058465:Nitrification; D009573:Nitrites / Q000737:chemistry; D009584:Nitrogen / Q000302:isolation & purification*; D009589:Nitrogen Oxides; D010084:Oxidation-Reduction; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000641:Ammonia; D009566:Nitrates; D009573:Nitrites; D009584:Nitrogen; D009589:Nitrogen Oxides; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Ammonia/nitrate coupled redox fuel cell; Electricity production; Landfill leachate; Nitrogen removal