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Water purification efficiency and influence factors of constructed wetlands in Erhai Basin(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2021 05
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Water purification efficiency and influence factors of constructed wetlands in Erhai Basin
GAO Xiaoyu1 2 YANG Tong3 SHAN Hang1 2 TANG Xin4 5 WANG Hao1 2 NI Leyi1 & CHOU Qingchuan1 2?
1 Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China2 University of Chinese Academy of Sciences, Beijing 100049, China3 Dali Erhai Administration, Dali 671000, China4 Beijing Enterprises Water (China) Investment Co., Ltd., Beijing 100049, China5 Beijing Beihua Qingchuang Environemtal Technology Co., Ltd., Beijing 100049, China
Erhai Basin constructed wetland purification efficiency wetland area water coverage aquatic plant

In recent years, constructed wetland ecosystems have received increasing attention globally and have been widely used in the treatment of point and non-point source pollution in the basin. To explore the operating status of the constructed wetlands in the Erhai Basin, we surveyed 34 constructed wetlands in the Erhai Basin from September to October 2019. We determined the wetland area (A), run time (T), water coverage (WC), vegetation coverage (VC), water circulation (Fvel, Fvol), water purification efficiency (the removal rates of total phosphorus (TP) and total nitrogen (TN), R(TP) and R(TN)), and dissolved oxygen (DO) at the inlet and outlet, among other factors. The wetlands were divided into two different types according to the differences in parameters such as R(TP), R(TN), WC, VC, and inflow-TP. The average Rm(TN) and Rm(TP) of the first type of constructed wetlands were 51.6% and 52.6%, respectively, indicating that this type of wetland had an obvious purification effect. The R(TN) was significantly negatively correlated with A and T, and positively correlated with the concentrations of N and P in the inflow water. Floating plants and submerged plants had clear advantages in removing N and P compared to emergent plants. The average Rm(TN) and Rm(TP) in the second type of constructed wetlands were ?4.9% and ?11.8%, respectively, which indicates that the N and P removal capability of wetlands had degraded, and that this type of wetland had no obvious purification effect. In summary, the constructed wetlands have high N and P removal capabilities with sufficient water cover, and are dominated by floating and submerged plant communities. As small and medium wetlands (0.10-0.50 km2) are easier to manage during operation, their N and P removal capacities are stronger than larger wetlands (> 0.50 km2). These results can provide a theoretical basis for the unified construction and scientific management of constructed wetlands at the watershed scale.


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