【摘要】 污水处理厂尾水作为再生水的主要来源之一，其氮素超标极易引起水体富营养化，影响再生水回用安全。因此，本研究以提升污水处理厂尾水中总氮出水水质为目标，设计两级串联人工湿地及三级串联人工湿地，分别考察其对尾水中氮素的去除效果。研究表明，两种串联人工湿地对尾水中化学需氧量(COD_Cr)、氨氮、总氮的去除率最高分别为30.61%、82.16%、94.60%和60.71%、92.19%、94.60%，出水均能稳定达到《地表水环境质量标准》（GB 3838—2002）Ⅲ类水质，但三级串联人工湿地相较两级串联人工湿地，尾水日处理量更高，COD_Cr、氨氮出水浓度更低。因此，三级串联人工湿地更适用于提升污水处理厂尾水水质，保障再生水回用安全。更多还原

【Abstract】 Sewage treatment plant tail water is one of the main sources of reclaimed water,and excessive nitrogen content can easily cause water eutrophication and affect the safety of reclaimed water reuse.Therefore,this study aims to improve the total nitrogen effluent quality in the tail water of the sewage treatment plant,and designs a two-stage series constructed wetland and a three-stage series constructed wetland to investigate their nitrogen removal effects in the tail water respectively.The research shows that the removal rates of chemical oxygen demand (COD_Cr),ammonia nitrogen and total nitrogen in the tail water of the two types of constructed wetlands are the highest at 30.61% and 82.16%,94.60% and 60.71%,92.19% and 94.60%,respectively,and the effluent can stably reach Class Ⅲ water quality in the "Environmental Quality Standard for Surface Water" （GB 3838—2002）,however,compared with the two-stage tandem constructed wetland,the three-stage tandem constructed wetland has a higher tail water daily treatment capacity and lower COD_Cr and ammonia nitrogen effluent concentrations.Therefore,the three-level series constructed wetland is more suitable for improving the quality of the tail water of the sewage treatment plant and ensuring the safety of reclaimed water reuse.更多还原