重金属迁移转化模型研究

Study of the model of heavy metal pollutants transport

大量重金属污染物迁移转化的现象和研究成果都表明重金属以泥沙颗粒为载体迁移转化,描述重金属在天然水体中的迁移转化必须紧紧抓住泥沙颗粒运动及重金属与泥沙之间的转化关系进行。为此在对现有的重金属迁移转化数学模型进行概括分类的基础上,根据水沙运动与污染物相互作用关系,分析了泥沙颗粒运动及重金属吸附解吸不平衡过程,并结合水沙数学模型,建立了重金属迁移转化的耦合模型。同时在模型合理性分析的基础上,对模型进行了计算分析,分析表明模型能够合理地反映重金属污染物在水体中的迁移转化过程。

Many phenomenon and findings have demonstrated that heavy mental pollutants transport through the carrier of sediment. So, to describe the complicated process, it is very important to firmly grasp two important factors: sediment motion and its relationship with heavy metal pollutants transport. In this article, the present existing models on heavy metal pollutants transport are generalized and classified. Base on analysis of the interaction relationship between sediment and pollutants, a coupling model on heavy metal pollutants transport is obtained by combing environment chemistry and mechanics of sediment motion. The sediment motion and the dynamic process of heavy metal's adsorption and release are considered in the model. To prove the model's rationality, theoretical analysis and computational comparison are also conducted, the result shows that the model can describe the complicated procession properly.