Constructed wetland is an alternative sewage treatment based on natural solutions, which can be applied as posttreatment of wastewater from conventional processes producing an effluent with excellent properties. In this study, over a period of 300 days, the removal of organic matter and nutrients (Nitrogen and Phosphorus) at different hydraulic retention times (2, 4 and 6 days) was evaluated. Three constructed wetlands with horizontal subsurface flow planted with Eleocharis sp. were operated as after-treatment of an aeration pond, which received municipal wastewater. Constructed wetland with the highest hydraulic retention time (6 days) was the one that obtained the best results in terms of organic matter (above 60%) and nutrients removal, reaching 74% of total phosphorus removal and 73% of total nitrogen removal. It was concluded that using constructed wetlands as posttreatment of aerated pond effluents proved to be promising as it enabled the maximization of nitrification due to the high presence of dissolved oxygen available in the bed, in addition to allowing the removal of organic matter and reaching high levels in removing nutrients.

Graphic abstract

中文翻译：

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水平潜流人工湿地作为曝气池出水的后处理

人工湿地是一种基于自然解决方案的替代污水处理方法，可用作传统工艺废水的后处理，产生具有优异性能的出水。在这项研究中，在 300 天的时间里，评估了在不同水力停留时间（2、4 和 6 天）下有机物和养分（氮和磷）的去除情况。三个人工湿地，水平地下流种植了胡蜂sp. 用作曝气池的后处理，曝气池接收城市污水。水力停留时间最长（6天）的人工湿地是有机质去除率（60%以上）和养分去除效果最好的湿地，达到总磷去除率的74%和总氮去除率的73%。得出的结论是，使用人工湿地作为曝气池流出物的后处理被证明是有前途的，因为除了允许去除有机物并达到高水平外，由于床中存在大量溶解氧，它能够最大限度地硝化作用在去除营养。

图形摘要