表面流人工湿地处理生活污水的研究

Treating domestic sewage by the free-water surface constructed wetlands

通过小试装置研究了表面流人工湿地对人工模拟生活污水的处理效果及相关运行参数。实验结果表明,表面流人工湿地系统对污水中的CODCr、TN、TP均有较好的综合净化能力,对各种污染物指标的去除率可分别达到CODCr 75%、TN 75%、TP73%,其中CODCr和TN达到一级排放标准分别需3 d和4 d的表观停留时间,TP要达到二级排放标准则需6 d的表观停留时间。而且,湿地植物对TN和TP的去除有比较明显的促进作用。

In this paper, the performance of treating laboratory domestic sewage by the free-water surface constructed wetlands was investigated by the pilot scale free-water surface constructed wetland. The removal efficiency and operation parameters was acquired. According to our results, the removal efficiencies of CODCr, TN, and TP are 75%, 75% and 73% respectively. The apparent retention time of the domestic sewage should be 3 or 4 days at least for CODCr, TN to meet the Class 1 discharge standard of pollutants for municipal wastewater treatment plant, and 6 days at least for TP to meet the Class 2 discharge standard. And there are significant different removal efficiency of TN and TP between wetland with plants and non-plant.