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| Comparison of Purification Performance in Tidal Flow and Horizontal Subsurface Flow Constructed Wetlands |
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| KeyWord:constructed wetlands; tidal flow; horizontal subsurface flow; purification performance; matrix microbial characteristic |
| Author Name | Affiliation | | LV Tao | College of Engineering, China Agricultural University | | WU Shu-biao | College of Engineering, China Agricultural University | | LIU Ming-hui | College of Engineering, China Agricultural University | | JU Xin-xin | College of Water Conservancy & Civil Engineering, China Agricultural University | | CHANG Yong-jiang | College of Agriculture and Biotechnology, China Agricultural University | | CHEN Li | College of Engineering, China Agricultural University | | DONG Ren-jie | College of Engineering, China Agricultural University |
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| Abstract: |
| Three laboratory-scale constructed wetlands（CWs）, namely, tidal flow CW, planted and unplanted horizontal subsurface flow CWs, were set up comparing the purification performance in this study. At the same influent concentration, the results showed that tidal flow operation can improve the oxygen condition in the wetland bed. CODCr and ammonium removal were approximately 94% and 95% in tidal flow CW, respectively. In planted horizontal subsurface flow constructed wetland, the CODCr, ammonium and the total nitrogen removal efficiency were proven to be 76%, 49% and 51% because of the positive effect of plants. The removal efficiencies of CODCr, ammonium and total nitrogen in unplanted horizontal subsurface flow constructed wetland were only 70%, 34% and 36%, respectively. Microbial activity was 0.3 mg·g-1 which was improved significantly in the wetlands with tidal flow operation, nearly three times to the horizontal subsurface flow constructed wetlands. The microbial nitrification intensity was found to be interrelated with the ammonium removal efficiencies which showed nitrification activity was the main way of ammonium removal. Moreover, the microbial nitrification intensity can be used as an important indicator to reflect the ammonium removal capacity of wetlands. |
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