When the pollution of the inland river is serious, there is relatively a dynamic balance between absorption and release of sediment and river water. The impact of the release of pollutants is not yet obvious. The amount of release may increase, causing secondary pollution. Therefore, in-depth understanding of the transformation, degradation and release of various pollutants in inland river sediments is of great significance for the effective control of inland river water pollution.
Many experiments have proved that the content of nutrients, toxic chemicals and toxic bacteria in the sediment of the water body is much higher than that in the upper water body. The environment poses a threat. The US EPA's 1998 investigation report pointed out that 2,100 fish consumption problems have occurred in the United States. It has been repeatedly confirmed that the pollution comes from sediment; The sediments of the Gukou-Xiantun River section and the Dasha River in Shenzhen. In addition, the key to the solution of water eutrophication is also closely related to sediment. Therefore, the treatment of contaminated sediments is no longer urgent, it is imperative.