三峡库区受淹土壤污染物释放量的试验研究

Experimental Study on Contaminant Release of Flooded Soils in Three Gorges Reservoir

三峡工程建成蓄水后,受淹耕地将遭到江水浸泡,积蓄在耕地上的有机污染物、N、P以及Cu、Cr等微量重金属将通过溶解、交换、扩散而迁移到江水中,增加江水中相应成份的含量。在调查了解三峡库区受淹土壤数量、类型的基础上,选择采集具有代表性的8个耕作土壤作样本,在实验的条件下模拟江水浸泡,求取单位重量的土壤在固—液相平衡状态下释放污染物的负荷量,进而计算三峡库区受淹土壤在江水浸没处于平衡时污染物释放进入水中污染物的量。结果表明,三峡水库受淹耕地污染物释放总量为181540.9t,其中以CODcr,BCOD5为主,二者合计93.78%,这将成为三峡库区水环境污染的重要污染源。

After the Three Gorges reservoir builded up, flooding the cultivated soils will soak by the river. Savings organic pollutions at cultivated soils, N, P, Cu, Cr, etc. micro-heavy metal will move to the river through dissolution, exchange and spread, it will increase content of corresponding composition in rivers. In this paper, on the basis of investigating the quantity and type of cultivated soils in the Three Gorges reservoir, the author has chose and gathered 8 pieces of cultivation soils with representative, made samples and imitated rivers to soak in experiment. The author has calculated the contaminant release of flooded soils under solid-liquid phase balanced stateless by the soils of weight, and calculated pollutant release and enter the quantities of flooded soils when it balance in the Three Gorges reservoir. The result shows that the contaminantrelease of flooded soils is 181 540.9 t, rely mainly on COD(cr), BOD5, the two total 93.78%, this will become the important pollution sources of water environmental in the Three Gorges reservoir.