The pollutant removal efficiency of traditionally constructed wetlands (CWs) is often limited due to low interaction time between wastewater and the CW matrix (plants, microbes, and substrates). A zigzag-horizontal subsurface flow constructed wetland with effluent recirculation (Z-HSSF + ER) was developed to improve removal efficiency. Echinodorus cordifolius plants were used in this study. The efficiency of the systems was evaluated using eutrophic wastewater. The results showed that the developed systems exhibited the high removal efficiency of algal cells, PO₄³⁻, and NO₃⁻ (97%, 70%, and 100%, respectively), within 5 days. Algal cells were removed by the interception mechanism of gravel and zigzag baffles. PO₄³⁻ and NO₃⁻ in the eutrophic wastewater was mainly removed by E. cordifolius including rhizobacteria and other microorganisms. The long flow pathway created by the installation of zigzag baffles combined with effluent recirculation provides high dissolved oxygen (DO) in the systems and increases the interaction time between wastewater and the CW matrix, thus improving the pollutant removal efficiency of CWs.

由于废水与湿地基质（植物、微生物和基质）之间的相互作用时间较短，传统人工湿地 (CW) 的污染物去除效率通常受到限制。开发了一种带有污水再循环（Z-HSSF + ER）的锯齿形水平地下流人工湿地，以提高去除效率。本研究使用Echinodorus cordifolius植物。使用富营养化废水评估系统的效率。结果表明，开发的系统在 5 天内表现出对藻类细胞、PO ₄ ^3-和 NO ₃ ^-的高去除效率（分别为 97%、70% 和 100%）。通过砾石和锯齿形挡板的拦截机制去除藻细胞。PO ₄^3-和NO ₃ ^-的富营养化废水中，主要是通过除去E. cordifolius包括根际细菌和其它微生物。由安装之字形挡板与出水再循环相结合产生的长流道在系统中提供了高溶解氧 (DO)，并增加了废水与 CW 基质之间的相互作用时间，从而提高了 CW 的污染物去除效率。