School of Life Science, Nanjing University, Nanjing, 210093, PR China.
School of Life Science, Nanjing University, Nanjing, 210093, PR China.
J Environ Manage. 2021 Mar 15;282:111947. doi: 10.1016/j.jenvman.2021.111947. Epub 2021 Jan 9.
Pilot-scale floating constructed wetlands (FCWs) under varying influent salinities were implemented, and the effects of influent salinity on pollutant removal efficiency (RE) and macrophyte species selection were identified. The results suggest that a salinity increase generally decreased pollutant REs, while some macrophytes, such as Iris pseudacorus, could effectively resist this decrease. The average coefficients of variation between macrophyte species in REs of chemical oxygen demand, ammonium nitrogen, nitrate nitrogen and total phosphorus increased from 28.6% at low salinity to 91.3% at high salinity, which suggests the greater importance of macrophyte selection under high salinity. With an increase in salinity, the rhizosphere bacterial community showed convergent evolution or convergence followed by slight divergent evolution between macrophyte species, while the importance of macrophyte parameter selection in characterizing pollutant REs decreased. Therefore, influent salinity is a key factor to consider in macrophyte selection and application, especially in FCWs without soil.
中试规模浮动人工湿地（FCWs）在不同进水盐度下进行了实施，并确定了进水盐度对污染物去除效率（RE）和水生植物物种选择的影响。结果表明，盐度的增加通常会降低污染物的 RE，而某些水生植物，如菖蒲，能够有效地抵抗这种降低。在低盐度下，RE 中化学需氧量、氨氮、硝酸盐氮和总磷的水生植物物种间平均变异系数为 28.6%，而在高盐度下则增加到 91.3%，这表明在高盐度下水生植物选择更为重要。随着盐度的增加，根际细菌群落表现出趋同进化或在水生植物物种之间趋同后略有发散进化，而水生植物参数选择在表征污染物 RE 方面的重要性降低。因此，进水盐度是水生植物选择和应用中需要考虑的关键因素，特别是在没有土壤的 FCWs 中。
