人工湿地床体中水质指标迁移转化规律研究

Study on the Transport and Transfer Laws of Water Quality Indexes in Subsurface Flow Constructed wetlands

在水力停留时间为1 d的条件下,研究了水平潜流人工湿地对生活污水的处理效果以及污水中水质指标COD、氨氮、总氮和总磷在湿地床体中的迁移转化规律。结果表明,污水中COD降解主要在湿地前端上部完成;氨氮浓度呈现随湿地流程延长而降低,随水位增加而增加的趋势;总氮浓度在湿地前端较高,而在湿地后端较低;磷浓度沿程不断降低,趋势性较为显著,该研究为湿地的设计及长期有效的运行提供了进一步的理论支持。

The effect of horizontal subsurface flow constructed wetland on treatment effect of domestic sewage as well as the transport and transfer laws of COD,NH4＋-N,TN and TP in the wetland were studied at the hydraulic retention time of 1 d.The results showed that the degradation of COD was mainly completed in the front and upper of wetland;the concentration of NH4＋-N decreased along the flow path of wetland,while increased with the increasing water levels;the concentration of total nitrogen was higher in the front of wetland,but lower in the back;the concentration of phosphorus decreased along the wetland,and the trend was significant.The study provided theoretical support for the design and long-term effective function of wetland.