潜流人工湿地预处理给水厂原水的效能研究

Efficiency of Subsurface-flow Constructed Wetland for Pretreatment of Raw Water

采用潜流人工湿地对给水厂原水进行预处理,以提高进水水质,减轻水厂常规处理工艺的负荷。以松花江水为研究对象,考察了人工湿地对原水中浊度、CODMn、UV254、TN和NH+4-N的处理效果。试验结果表明,在进水流量为0.8 m3/d、水力停留时间为1.5 d时,该工艺对浊度、CODMn、UV254、TN和NH+4-N的平均去除率分别为93.71%、43.19%、17.69%、49.15%和48.92%。潜流人工湿地对原水预处理效率较高,运行稳定,可以有效减轻后续工艺的处理负荷。

In order to improve the inflow water quality and mitigate the loads of water treatment processes, a subsurface-flow constructed wetland was used to pretreat the raw water of waterworks. Using the Songhua River as the raw water source, the removal of turbidity, CODMn, UV254, TN and NH4^＋ - N in the subsurface-flow constructed wetland was investigated. The results show that when the inflow rate is 0.8 m^3/d and the hydraulic retention time （HRT） is 1.5 d, the average removal rates of turbidity, CODMn, UV254, TN and NH4 - N in the constructed wetland are 93.71% , 43. 19% , 17. 69%, 49.15% and 48.92% respectively. The subsurface-flow constructed wetland has high treatment effect and stable operation. It can reduce the loads of water treatment processes.