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摘要：研究了往复流砾石床对雨污混合流脱氮效果的影响，试验设计两个相同的砾石床系统，采用回流与间歇流同步的进水方式，通过调控水位和停留时间使砾石床内部循环往复运行复氧，同步实现时间和空间上的硝化反硝化过程，分析在两种水力负荷（132 mm?d^-1和158 mm?d^-1）条件下干湿交替对污染物的去除效果的影响.结果表明：相同配水条件下，水力负荷较低时，脱氮效率较高.为实现水力负荷为158 mm?d^-1时的高效脱氮，在原配水方式基础上增加3次回流，总氮和氨氮的累计去除率分别达到76.06%±10.61%、89.08%±3.85%，明显高于相同进水水质条件下，水力负荷为132 mm?d^-1时总氮和氨氮的去除率64.00%±10.75%、80.73%±9.48%.在湿地未种植任何植物的情况下，增加回流往复频次有利于实现高效脱氮，弥补高水力负荷条件下脱氮效率较低的不足，对人工湿地的高效运行具有重要的指导意义.

Abstract：This study investigated the nitrogen removal efficiency of combined sewer overflows（CSOs） through two identical experimental wetland systems with a reciprocating gravel bed. The wetland systems used reciprocal and intermittent flow for water inlet， which could create reoxygenation circumstance inside the gravel bed by manipulating the water level and residence time， in order to achieve an alternating nitrification and denitrification. Then two hydraulic loadings（132 mm?d^-1 and 158 mm?d^-1）were adopted， separately， to investigate the removal efficiency of pollutants. results showed that higher nitrogen removal efficiency was obtained with a low hydraulic loading （132 mm?d^-1）. In order to improve the nitrogen removal efficiency with 158 mm?d^-1 of hydraulic loading， three cycles of reciprocal flow were adopted and the removal rates of total nitrogen and ammonia nitrogen were 76.06%±10.61% and 89.08%±3.85%， which were much higher than 64.00%±10.75% and 80.73%±9.48% with a hydraulic loading of 132 mm?d^-1. In conclusion， increasing frequency of reciprocal flow was in favor of high nitrogen removal efficiency even through no plants growing in the wetland， which was significant for effective operation of the constructed wetland.

Key words：reciprocal flow combined sewer overflows（CSOs） constructed wetland high efficiency denitrification