HR: 0800h
AN: B41A-0022    [Abstracts]
TI: A pilot-scale study of domestic wastewater treatment by different type constructed wetland systems and its potential green house gases emissions
AU: * XU, K
EM: joexu@nies.go.jp
AF: Kai-Qin XU, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: * XU, K
EM: joexu@nies.go.jp
AF: Kai-Qin XU, No. 8 East Lake South Road, Wuhan, 430072, China
AU: LIU, C
EM: liu.chaoxiang@nies.go.jp
AF: Kai-Qin XU, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: GUI, P
EM: gui.ping@nies.go.jp
AF: Kai-Qin XU, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: EBIE, Y
EM: ebie.yoshitaka@nies.go.jp
AF: Kai-Qin XU, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: INAMORI, Y
EM: ina0120@sss.fukushima-u.ac.jp
AF: Yuhei Inamori, 1 Kanayagawa, Fukushima, 960-1296, Japan
AB: Constructed wetland (CV) systems are reliable, flexible in design, and can be built, operated, and maintained at lower costs compared to conventional methods of chemical treatment. There for CW systems are widely used for controlling water-body eutrophication as an ease-operation and cost-effective ecological technology in developing countriens. However, growing attention has been directed to its greenhouse side-effect and global-warming potential in recent years. In this study, three typical constructed wetlands: Vertical Flow (VF), Free Water Surface (FWS) and Subsurface Flow (SF), and combined VF-SF-FWS constructed wetlands were used not only to compare the nutrients removal performance for treatment of low C/N ratio loading domestic wastewater, but also to investigate and compare their CH4 and N2O greenhouse gas emissions characteristics. The results indicated that the four types of CWs had high removal efficiencies for organic matter and SS. Moreover, the combined wetland also showed a comparatively good performance for nitrogen and phosphorus removal, which was 93.6%, 92.8%, 81.3% and 84.5% for BOD5, SS, TN and TP, respectively. It was found that the combined CW and VF CW has 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 four types of CWs, which was about the same as 425mgCO2/m2/h.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0465 Microbiology: ecology, physiology and genomics (4840)
DE: 0470 Nutrients and nutrient cycling (4845, 4850)
DE: 0478 Pollution: urban, regional and global (0345, 4251)
DE: 0496 Water quality
SC: Biogeosciences [B]
MN: 2007 Fall Meeting