西五里湖疏浚底泥资源化处理的二次污染问题研究

Research of secondary pollution induced by reutilization of dredged sediment from west Wulihu Lake

针对疏浚底泥常规处理方法的不足,采用固化处理方式对西五里湖重污染水体疏浚底泥进行处理.结合室内试验和数值模拟方法对疏浚泥直接堆放和经固化处理两种情况下的二次污染问题进行了对比分析.研究结果表明,固化处理可以减缓疏浚泥中污染物的溶出速率,对周围环境的二次污染远远小于未经处理的疏浚泥,但是要注意选择二次污染小的固化材料;渗透系数是控制疏浚泥二次污染的重要因素,降低渗透系数可以减少疏浚泥的二次污染.

In consideration of some disadvantages in conventional methods for treatment of dredged sediment, the method of solidification was adopted for treatment of dredged sediment from the seriously polluted water body of the west Wulihu Lake. A contrast analysis was made of the secondary pollution induced by dredged sediment without treatment and after solidification treatment by the way of laboratory test and numerical simulation. The result shows that the solidification treatment can decelerate the release of pollutants, and the degree of the secondary pollution is lower than that of untreated dredged sediment, but the selection of solidifying materials should be paid much attention. Furthermore, it is concluded that the coefficient of permeability is the important factor for control of the secondary pollution, and that the less seepage means the less secondary pollution.