title: Nitrogen removal and nitrous oxide emission in surface flow constructed wetlands for treating sewage treatment plant effluent: Effect of C/N ratios.
abstract: In order to design treatment wetlands with maximal nitrogen removal and minimal nitrous oxide (N2O) emission, the effect of influent C/N ratios on nitrogen removal and N2O emission in surface flow constructed wetlands (SF CWs) for sewage treatment plant effluent treatment was investigated in this study. The results showed that nitrogen removal and N2O emission in CWs were significantly affected by C/N ratio of influent. Much higher removal efficiency of NH4+-N (98%) and TN (90%) was obtained simultaneously in SF CWs at C/N ratios of 12:1, and low N2O emission (8.2mg/m2/d) and the percentage of N2O-N emission in TN removal (1.44%) were also observed. These results obtained in this study would be utilized to determine how N2O fluxes respond to variations in C/N ratios and to improve the sustainability of CWs for wastewater treatment.
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China. Electronic address: haimingwu14@nwsuaf.edu.cn.
authors.forename: Haiming
authors.initials: H
authors.lastname: Wu
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia.
authors.forename: Huu Hao
authors.initials: HH
authors.lastname: Ngo
authors.affiliation: School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia.
authors.forename: Wenshan
authors.initials: W
authors.lastname: Guo
authors.affiliation: College of Life Science, Shandong Normal University, Jinan 250014, Shandong, PR China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Kong
mesh_terms: D058440:Denitrification; D009584:Nitrogen; D009609:Nitrous Oxide; D012722:Sewage; D014865:Waste Disposal, Fluid; D053833:Wetlands
chemical_list: D012722:Sewage; D009609:Nitrous Oxide; D009584:Nitrogen
keywords: C/N ratio; Constructed wetlands; Nitrogen transformation; Nitrous oxide; Wastewater treatment