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Pilot-scale studies of domestic wastewater treatment
by typical constructed wetlands and their greenhouse gas emissions |
| Chaoxiang LIU1,Kaiqin XU2,Ryuhei INAMORI3,Yuhei INAMORI3,Yoshitaka EBIE4,Jie LIAO5, |
| 1.Research Center for
Material Cycles and Waste Management, National Institute for Environmental
Studies, Tsukuba 305-8506, Japan；Institute of Urban Environment,
Chinese Academy of Sciences, Xiamen 361021, China; 2.Research Center for
Material Cycles and Waste Management, National Institute for Environmental
Studies, Tsukuba 305-8506, Japan；State Key Laboratory
of Water Resources and Hydropower Engineering Science, Wuhan University,
Wuhan 430072, China; 3.Faculty of Symbiotic
Systems Science, Fukushima University, Fukushima 960-1296, Japan; 4.Research Center for
Material Cycles and Waste Management, National Institute for Environmental
Studies, Tsukuba 305-8506, Japan; 5.Institute of Urban Environment,
Chinese Academy of Sciences, Xiamen 361021, China; |
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Abstract Three typical constructed wetlands (CWs) including Vertical Flow (VF), Free Water Surface (FWS), and Subsurface Flow (SF), and combined VF-SF-FWS constructed wetlands were investigated for the treatment of domestic wastewater with low C/N ratio. The performance of nutrient removal and the characteristics of greenhouse gas emissions, such as CH4 and N2O, from these CWs were compared. The results indicated that the four types of CWs had high removal efficiencies for organic matter and suspended solid (SS). The combined wetland also showed a comparatively good performance for nitrogen and phosphorus removal, and the removal efficiencies for total nitrogen (TN) and total phosphorus (TP) were 81.3% and 84.5%, respectively. The combined CWs had a comparative lower global warming potential. The FWS CW had the highest tendency to emit CH4 and led to a higher global warming potential among the four types of CWs, which was about 586 mg CO2/m2·h.
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| Keywords
global warming potential
methane
nitrous oxide
low C/N ratio
nitrogen
phosphorus
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Issue Date: 05 December 2009
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