潜流人工湿地在预处理黄河微污染原水中的应用

Application of constructed subsurface wetlands for pretreatment of slightly polluted raw water from Yellow River

近年来,黄河水质不断恶化,呈现显著的微污染特征。在济南市玉清湖水库进水口处进行了潜流人工湿地对入库微污染黄河水的净化试验。试验结果表明:在4 m/d的水力负荷条件下,推流式人工湿地与往复式人工湿地都有较好的处理效果,COD_(Cr)、TP的平均去除率均可达到45%～50%,NH_3—N、NO_2^-—N、NO_3^-—N的平均去除率均可达到35%～40%,TN的平均去除率为25%～35%。二者没有明显的差别。

The water quality at the Jinan reach of Yellow River deteriorates now it is believed in state as slightly polluted. Field experiment of raw water pretreatment was done at the entrance of Yuqinghu Reservoir, the municipal water source of Jinan City. This was constructed subsurface wetland working in plug and reciprocal flow patterns. The experimental data indicated that when the hydraulic loading rate held at 4, m/d, adequate treatment could be got by both wetlands working in plug or reciprocal flow pattern. Removal ratio of 45-50%, 45-50%, 35-40%, 35- 40%, 35-40% and 25-35% were obtained for CODcr, TP,NH3^--N,NO2^ --N, NO3^--N and TN respectively.