回流立式组合人工湿地处理生活污水的效果

针对目前我国农村存在的生活污水随意排放问题，构建了一种安装方便、工艺简单的回流立式组合人工湿地系统用于处理生活污水，研究其对污染物质的去除效果和过程，及不同基质（砾石、陶粒、火山石）间污染物质去除的差异。结果显示，回流立式组合人工湿地系统对COD、NH4+-N、TN、TP的去除率分别高达95%、99%、53%、57%，其中COD、NH4+-N的去除过程符合一级动力学模型。不同基质组湿地对生活污水处理效果存在显著差异（P4+-N、TN的去除效果较好，火山石组对COD、TP去除效果较好，可分别作为人工湿地脱氮除磷的优先选择。结果表明，回流立式组合人工湿地去除能力好、占地面积小、操作方便，是一种具有广阔发展前景的农村污水处理技术。

Treatment of domestic wastewater by recycled standing combined constructed wetlands

To solve the present problem about arbitrarily discharged domestic sewage in rural areas, we developed a set of recycled standing combined constructed wetland system (RSCCWS) for domestic sewage treatment. The aim of this research was to study the efficiency and process of pollutants removal by our self-developed RSCCWS. Three treatment groups with different filter media (gravel, clay ceramic particles and volcanic rock) were set up to identify the differences in pollutants removal by RSCCWS. The results showed that the removal efficiencies of COD, NH4+-N, TN and TP by the RSCCWS were as high as 95%, 99%, 53%, and 57%, respectively. Moreover, the removal process of COD and NH4+-N corresponded to the first order kinetic model. The results showed that there were significant differences (P4+-N and TN, and the volcanic rock group performed significantly better in removing COD and TP. Therefore, it was concluded that, for rural sewage treatment, RSCCWS is a promising treatment system that can treat domestic sewage effectively, with easy operation and less occupied area.