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Article

Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands

1
Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
2
China Ship Scientific Research Center, Wuxi 214082, China
3
Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
*
Authors to whom correspondence should be addressed.
Water 2020, 12(7), 2007; https://doi.org/10.3390/w12072007
Received: 17 May 2020 / Revised: 22 June 2020 / Accepted: 27 June 2020 / Published: 15 July 2020
(This article belongs to the Special Issue Innovative Technologies for Wastewater and Water Treatment)
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), NH4+−N and organic nitrogen, but it had no remarkable effect on the removal of NO3−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, NO3−N and TP. VFCW had a remarkable superiority for COD and organic nitrogen degradation, but its effluent NH4+−N concentration was higher, indicating the NH4+−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. View Full-Text
Keywords: eutrophic water; vertical-flow constructed wetland; horizontal-flow constructed wetlands; enzymatic activities; influent load; ammonia oxidation eutrophic water; vertical-flow constructed wetland; horizontal-flow constructed wetlands; enzymatic activities; influent load; ammonia oxidation
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MDPI and ACS Style

Ni, Q.; Wang, T.; Liao, J.; Shi, W.; Huang, Z.; Miao, H.; Wu, P.; Ruan, W. Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands. Water 2020, 12, 2007. https://doi.org/10.3390/w12072007

AMA Style

Ni Q, Wang T, Liao J, Shi W, Huang Z, Miao H, Wu P, Ruan W. Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands. Water. 2020; 12(7):2007. https://doi.org/10.3390/w12072007

Chicago/Turabian Style

Ni, Qijun, Tao Wang, Jialin Liao, Wansheng Shi, Zhenxing Huang, Hengfeng Miao, Peng Wu, and Wenquan Ruan. 2020. "Operational Performances and Enzymatic Activities for Eutrophic Water Treatment by Vertical-Flow and Horizontal-Flow Constructed Wetlands" Water 12, no. 7: 2007. https://doi.org/10.3390/w12072007

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