中文摘要：

通过多级人工湿地-塘组合系统在不同的污水停留时间下处理污染水体,对各项出水污染物进行测试对比。结果表明：在初春低温条件下,COD、TN和NH_4~＋-N的去除率随着污水停留时间的增加显著提高,其中COD在污水停留时间达到5 d之后去除率开始趋于平缓,TN和NH_4~＋-N的去除率在污水停留时间达到5 d之后出现下降。表明在保证处理效果的前提下,污水停留时间选在4~5 d之间较为合理。这为实际处理污染水体提供了一定的参考。

英文摘要：

Through multiple constructed wetland-pond combined system dispose polluted water in different hy-draulic retention time. Tested and contrasted concentration of the water pollutants. The results showed that in early spring with increasing hydraulic retention time the COD, TN and NH4＋ -N removal rate increased significantly. When the hydraulic retentiorr time up to 5 day~, the COD removal rate began to flatten, TN and NH4 -N removal rate began to decline. Ensure the treatment effect, the hydraulic retention time is reasonable between 4 days and 5 days. This provides a reference for the actual treatment of polluted water.