title: Purification ability and carbon dioxide flux from surface flow constructed wetlands treating sewage treatment plant effluent.
abstract: In this study, a two-year experiment was carried out to investigate variation of carbon dioxide (CO2) flux from free water surface constructed wetlands (FWS CW) systems treating sewage treatment plant effluent, and treatment performance was also evaluated. The better 74.6-76.6% COD, 92.7-94.4% NH4(+)-N, 60.1-84.7% TN and 49.3-70.7% TP removal efficiencies were achieved in planted CW systems compared with unplanted systems. The planted CW was a net CO2 sink, while the unplanted CW was a net CO2 source in the entire study period. An obvious annual and seasonal variability of CO2 fluxes from different wetland systems was also presented with the average CO2 flux ranging from -592.83mgm(-2)h(-1) to 553.91mgm(-2)h(-1) during 2012-2013. In addition, the net exchange of CO2 between CW systems and the atmosphere was significantly affected by air temperature, and the presence of plants also had the significant effect on total CO2 emissions.
authors.affiliation: College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, PR China.
authors.forename: Haiming
authors.initials: H
authors.lastname: Wu
authors.affiliation: Department of Water Environment Research, Changjiang River Scientific Research Institute, Wuhan 430010, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Lin
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China. Electronic address: zhangjian00@sdu.edu.cn.
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: Wenshan
authors.initials: W
authors.lastname: Guo
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: Shuang
authors.initials: S
authors.lastname: Liang
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, United States.
authors.forename: Hai
authors.initials: H
authors.lastname: Liu
mesh_terms: D000641:Ammonia / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D057486:Carbon Cycle; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D009584:Nitrogen / Q000378:metabolism; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D060753:Water Quality; D053833:Wetlands
chemical_list: D012722:Sewage; D002245:Carbon Dioxide; D000641:Ammonia; D009584:Nitrogen
keywords: Carbon dioxide; Constructed wetlands; Greenhouse gas emissions; Pollutant removal; Wetland plants