中文摘要：

通过内碳源前置反硝化脱氮工艺试验,比较了不同回流比对垂直流人工湿地除氮效果的影响。试验结果表明,TN去除率随着回流比增加而增加,NH4＋-N去除率则随着回流比的增加先降低后增加的趋势,两者去除率之和以回流比200%为最高,以回流比150%次之,以回流比100%为最低。从TN的去除率来看,回流比150%略高于回流比200%。

英文摘要：

Experiment of the preanoxic process for biological nitrogen removal was carried out to study the performance and how the effect of different recirculation ratios on the removal efficiency of nitrogen in vertical flow constructed wetland. The results of this experiment showed that the removal efficiency of TN improved with the increase of recirculation ratio. The removal of efficiency of NH4^＋ -N decreased with the increase of recirculation at low ratios, but increased with the increase of recirculation at high ratios. The sum of the removal efficiencies of TN and NH4^＋ -N of different recirculation ratios showed that 200% recirculation ratio was the highest, followed by 150% recirculation ratio, and 100% recirculation ratio was the lowest. If only accounted for the removal efficiency of TN, 150% recirculation ratio was better than that of 200% recirculation ratio.