复合垂直流人工湿地净化污水厂二级出水的研究

Purification of Secondary Effluent from WWTP by Integrated Vertical-flow Constructed Wetland

在间歇运行条件下,采用复合垂直流人工湿地净化污水处理厂二级出水,考察了其净化效果及影响因素。结果表明,该系统能够有效降低污水厂二级出水中的氮和磷,适用于城市污水的深度处理。在0.4 m3/(m2.d)的低水力负荷条件下,系统对COD、氨氮、总氮和PO34--P的去除率分别为87.4%、82.15%、60.32%和30.15%;当排空时间为2 h时,系统的处理效果最好,对氨氮、总氮、PO34--P的去除率分别为84.44%、65.46%和40.33%。

The integrated vertical-flow constructed wetland under intermittent operation condition was used for purification of secondary effluent from WWTP, and the purification efficiency and the influ- encing factors were investigated. The results show that the system can remove the nitrogen and phosphor- us in secondary effluent from WWTP and is suitable for advanced treatment of municipal wastewater. Un- der low hydraulic load of 0.4 m3/（m2 ·d） , the removal rates of COD, NH3 -N, TN and PO4^3--P are 87.4% , 82.15% , 60.32% and 30.15% respectively. When the optimum idle time is 2 h, the removal rates of NH3 - N, TN and PO4^3--P are 84.44% , 65.46% and 40.33% respectively.