Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing 210093, China.
Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing 210093, China.
Bioresour Technol. 2020 Dec;318:124202. doi: 10.1016/j.biortech.2020.124202. Epub 2020 Oct 1.
Pilot-scale saturated vertical flow constructed wetlands (VF-CWs) were established to identify whether T. tubifex has the similar performance in saturated VF-CWs to that in surface flow CWs in improving pollutant removal efficiency (RE). The saturated VF-CWs with T. tubifex achieved REs of 67.3% total nitrogen (TN) and 39.8% chemical oxygen demand (COD), which were significantly higher than treatments without T. tubifex (42.2% TN and 31.4% COD). There existed significant interactions between macrophytes and T. tubifex. T. tubifex greatly improved the dissolved oxygen by increasing the connectivity between layers, and enhanced dehydrogenase activity and fluorescein diacetate. Adding T. tubifex improved the bacterial diversity and relative abundance of both N-cycle bacteria and fermentation bacteria in the biofilms. The improvements of ammonia oxidation and anammox were the main pathways for the increased nitrogen removal by T. tubifex. Therefore, T. tubifex is a useful tool for improving pollutant REs in saturated VF-CWs.
采用中试规模的饱和垂直流人工湿地（VF-CWs），以确定颤蚓（Tubifex tubifex）在提高污染物去除效率（RE）方面，是否在饱和 VF-CWs 中具有与表面流 CWs 中相似的性能。含有颤蚓的饱和 VF-CWs 的总氮（TN）和化学需氧量（COD）去除率分别达到了 67.3%和 39.8%，明显高于不含颤蚓的处理（TN 去除率为 42.2%，COD 去除率为 31.4%）。大型植物和颤蚓之间存在显著的相互作用。颤蚓通过增加层间的连通性来增加溶解氧，并提高脱氢酶活性和荧光素二乙酸酯。添加颤蚓可以提高生物膜中氮循环细菌和发酵细菌的多样性和相对丰度。氨氧化和厌氧氨氧化的改善是颤蚓提高氮去除率的主要途径。因此，颤蚓是提高饱和 VF-CWs 中污染物 RE 的有用工具。
