Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands
In this study, pilot-scale vertical-flow constructed wetland (VFCW) and horizontal-flow constructed wetland (HFCW) were constructed to treat eutrophic water, and dissolved oxygen (DO) distributions, decontamination performances and key enzymes activities were compared under different influent loads....
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| Format: | Article |
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MDPI AG
2020-07-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/7/2007 |
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| author | Qijun Ni Tao Wang Jialin Liao Wansheng Shi Zhenxing Huang Hengfeng Miao Peng Wu Wenquan Ruan |
| author_facet | Qijun Ni Tao Wang Jialin Liao Wansheng Shi Zhenxing Huang Hengfeng Miao Peng Wu Wenquan Ruan |
| author_sort | Qijun Ni |
| collection | DOAJ |
| description | In this study, pilot-scale vertical-flow constructed wetland (VFCW) and horizontal-flow constructed wetland (HFCW) were constructed to treat eutrophic water, and dissolved oxygen (DO) distributions, decontamination performances and key enzymes activities were compared under different influent loads. The influent load increase caused reductions of DO levels and removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), NH<sub>4</sub><sup>+</sup>−N and organic nitrogen, but it had no remarkable effect on the removal of NO<sub>3</sub><sup>−</sup>−N and total phosphorus (TP). The interior DO concentrations of VFCW were higher than those of HFCW, indicating a vertical hydraulic flow pattern was more conducive to atmospheric reoxygenation. The VFCW and HFCW ecosystems possessed comparable removal capacities for TN, NO<sub>3</sub><sup>−</sup>−N and TP. VFCW had a remarkable superiority for COD and organic nitrogen degradation, but its effluent NH<sub>4</sub><sup>+</sup>−N concentration was higher, indicating the NH<sub>4</sub><sup>+</sup>−N produced from organic nitrogen degradation was not effectively further removed in the VFCW system. The activities of protease, urease and phosphatase declined with the increasing depth of substrate layers, and they were positively correlated with DO concentrations. The enzymatic activities of VFCW were significantly higher than that of HFCW in the upper layers. Taken together, VFCW and HFCW presented a certain difference in operational properties due to the different hydraulic flow patterns. |
| first_indexed | 2024-03-10T18:28:49Z |
| format | Article |
| id | doaj.art-93f825daf15d4ee2b314012245962db4 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T18:28:49Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-93f825daf15d4ee2b314012245962db42023-11-20T06:49:32ZengMDPI AGWater2073-44412020-07-01127200710.3390/w12072007Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed WetlandsQijun Ni0Tao Wang1Jialin Liao2Wansheng Shi3Zhenxing Huang4Hengfeng Miao5Peng Wu6Wenquan Ruan7Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, ChinaJiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, ChinaJiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, ChinaJiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, ChinaJiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, ChinaJiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, ChinaJiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, ChinaJiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, ChinaIn this study, pilot-scale vertical-flow constructed wetland (VFCW) and horizontal-flow constructed wetland (HFCW) were constructed to treat eutrophic water, and dissolved oxygen (DO) distributions, decontamination performances and key enzymes activities were compared under different influent loads. The influent load increase caused reductions of DO levels and removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), NH<sub>4</sub><sup>+</sup>−N and organic nitrogen, but it had no remarkable effect on the removal of NO<sub>3</sub><sup>−</sup>−N and total phosphorus (TP). The interior DO concentrations of VFCW were higher than those of HFCW, indicating a vertical hydraulic flow pattern was more conducive to atmospheric reoxygenation. The VFCW and HFCW ecosystems possessed comparable removal capacities for TN, NO<sub>3</sub><sup>−</sup>−N and TP. VFCW had a remarkable superiority for COD and organic nitrogen degradation, but its effluent NH<sub>4</sub><sup>+</sup>−N concentration was higher, indicating the NH<sub>4</sub><sup>+</sup>−N produced from organic nitrogen degradation was not effectively further removed in the VFCW system. The activities of protease, urease and phosphatase declined with the increasing depth of substrate layers, and they were positively correlated with DO concentrations. The enzymatic activities of VFCW were significantly higher than that of HFCW in the upper layers. Taken together, VFCW and HFCW presented a certain difference in operational properties due to the different hydraulic flow patterns.https://www.mdpi.com/2073-4441/12/7/2007eutrophic watervertical-flow constructed wetlandhorizontal-flow constructed wetlandsenzymatic activitiesinfluent loadammonia oxidation |
| spellingShingle | Qijun Ni Tao Wang Jialin Liao Wansheng Shi Zhenxing Huang Hengfeng Miao Peng Wu Wenquan Ruan Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands Water eutrophic water vertical-flow constructed wetland horizontal-flow constructed wetlands enzymatic activities influent load ammonia oxidation |
| title | Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands |
| title_full | Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands |
| title_fullStr | Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands |
| title_full_unstemmed | Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands |
| title_short | Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands |
| title_sort | operational performances and enzymatic activities for eutrophic water treatment by vertical flow and horizontal flow constructed wetlands |
| topic | eutrophic water vertical-flow constructed wetland horizontal-flow constructed wetlands enzymatic activities influent load ammonia oxidation |
| url | https://www.mdpi.com/2073-4441/12/7/2007 |
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