【摘要】 通过多级人工湿地-塘组合系统在不同的水力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NH₄⁺-N的去除率随着水力停留时间的增加显著提高,在保证处理效果的前提下,水力停留时间选择4 d较为合理。在水力停留时间为4 d时进行为期12个月的试验。试验结果表明:随着季节的变化,多级人工湿地-塘组合系统对模拟农村径流污水的净化效果保持在一个合理的波动范围内,在夏季时对污水中COD,TN以及NH₄⁺-N去除效果比在冬季时好。从试验去除污染物的效果可以看出,本系统可以在除污染物方面达到比较令人满意的效果,COD出水水质最好时为Ⅳ类水质,NH₄⁺-N出水水质最好时接近地表水Ⅳ类水质。更多还原

【Abstract】 The effect of multi-stage constructed wetland-pond system in treating contaminated water with different hydraulic retention time（ HRT） is researched. The pollutants in effluent water are tested for comparison. Results show that in early spring with low temperature,the removal rates of COD,TN and NH₄⁺-N increase significantly with the increasing of HRT. Under the premise of ensuring the treatment effect,four-day HRT is reasonable. Twelve months of test with four-day HRT were conducted,and the test results show that as the seasons change,the purification effect of multi-stage constructed wetland-pond system fluctuates within a reasonable range: the COD,TN and NH₄⁺-N removal rates in summer are better than those in winter. From the test results we conclude that the present system could achieve satisfactory result in removing contaminants,with the best quality of COD-removed effluent water reaching grade IV,and NH₄⁺-N-removed effluent water close to grade IV of surface water.更多还原