Purification ability and carbon dioxide flux from surface flow constructed wetlands treating sewage treatment plant effluent

Publication Type:
Journal Article
Bioresource Technology, 2016, 219 pp. 768 - 772
Issue Date:
Full metadata record
© 2016 Elsevier Ltd In this study, a two-year experiment was carried out to investigate variation of carbon dioxide (CO 2 ) 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% NH 4+ -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 CO 2 sink, while the unplanted CW was a net CO 2 source in the entire study period. An obvious annual and seasonal variability of CO 2 fluxes from different wetland systems was also presented with the average CO 2 flux ranging from −592.83 mg m −2  h −1 to 553.91 mg m −2  h −1 during 2012–2013. In addition, the net exchange of CO 2 between CW systems and the atmosphere was significantly affected by air temperature, and the presence of plants also had the significant effect on total CO 2 emissions.
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