中文摘要：

应用静态沉降实验方法中的移液管法，初步研究了泥沙浓度在不同的水质条件下对絮凝沉降过程的影响．实验结果表明：随着泥沙浓度的增加，絮凝沉速先增加后减小，变化曲线存在一个最大值．不同的离子浓度条件下，这种变化趋势是相同的，但絮凝沉降所能达到的最大值是不同的，达到最大值时的泥沙浓度也是不同的．随着泥沙浓度增加絮凝沉降速度先增后减的根本原因是絮凝过程的变化，即絮网结构的出现，絮网结构出现是泥沙浓度因素和离子浓度因素共同作用的结果．

英文摘要：

The experimentation was done of sediments settling in water with different ions concentrations and different sediment concentrations. The experimental results show that： with the increase of sediment concentration, the settling velocity would increase to maximum; and then when the sediment concentration increases more, the settling velocity would begin to reduce; then there is a peak value when the sediment concentration increases all along. If the ion concentration changed, the peak value would change too; and with different ion concentrations the sediment concentrations on the peak value are different. The most important reason is the flocculation configuration of sediment change; just the meshy flocculation configuration emerged. The meshy flocculation configuration emerged with relation to not only the cation concentration but also the sediment concentration. Then we can know from the experiment that the reciprocity and interaction of different factors are more important than the factor only for sediment flocculation.