表流湿地土壤因素对微污染水净化作用

The role of wetland soil on the purification of the micro-polluted raw water

为了研究人工湿地土壤在处理微污染原水的作用,在济南玉清湖水库建立土壤空白床进行实验研究。结果表明,在排除了植物因子的前提下,人工湿地的土壤-微生物系统对微污染原水中COD平均去除率达到46.67%、对TN的平均去除率为34.86%、对NH4+-N的平均去除率分别达到39.83、对TP的平均去除率达到45.12%。系统不同单位区段对微污染原水中的COD、TN、NH4+-N、TP去除率存在差异,在第一个单位区段的处理效率最高,分别为21.5%、18.32%、19.85%和16.64%,远大于第二、三、四区段。另外,土壤吸收附磷的过程中存在着积累现象。而且,系统处理效率受温度影响显著,随着温度的降低,污染物去除率也下降。

In order to study the role of wetland soil on the purifying the micro-polluted water, soil-bacteria system is built to study experimentally in Yuqing Lake in Jinan. The removal process of a simulation wetland was studied in the absence of aquatic plants. The results show the average removal rates of COD, TN, NH4＋-N and TP were 46.67%, 34.86%, 39.83% and 45.12%, respectively. The 16 m long system was divided into four equal units along the direction of inflow. The removal of COD, TN, NH4＋-N and TP mainly occurred in the first unit, with a removal of 21.5%, 13.5%, 19.85 and 16.64%, respectively. This efficiency was much greater than those in the subsequent three units. In addition, the accumulation of P was found in soil and TP of soil would reach a peak. Moreover, the removal of contamination in water is influenced obviously by the system under the temperature. As the temperature goes down, the removal rate of contamination is eliminated rapidly.