河流泥沙的环境效应分析

分析了泥沙环境效应的研究状况,讨论了吸附在泥沙上的污染物迁移转化的模式与计算模型,简要说明了利用模型推求污染物质量浓度与吸附污染物量的方法。研究表明,悬移质对重金属的吸附大都可以用Freundlich型或Langmuir型吸附等温式进行较好的拟合;基于泥沙粒径对金属吸附的独立性,可采用等效粒径的等温式进行试验拟合,建立吸附预测模型。通过已有Freundlich模型对贾鲁河水体中总磷的计算,发现随着二站间含沙量的增大,二站总磷含量减小,泥沙吸附磷在总磷中所占的比例增大。

Analysis on Environmental Effect of River Sediment

The condition of the research on the environmental effect of sediment is analyzed.The mode transferring and transforming the pollutant by sediment and the computational model are discussed,and the methods of calculating the pollutant content and the quantity of the adsorbing pollutant are also explained briefly.As shown in the research,the adsorption of the suspending material to heavy metal mostly can be described by the Freundlich or Langmuir isotherm preferably;and the adsorption of the sediment with different grain size doesn't impact on each other.So a kind of isotherm with the same grain size can be used to calculate by the experiment,which provides a way to establish a numerical forecast model.Calculating the TP in the Jialu River by the Freundlich isotherm,it is shown that as the increase of the sediment concentration between two stations,the content of the TP decreases and the percentage of the phosphorus adsorbed by the sediment in the TP increases.