有机质对细颗粒泥沙静水絮凝沉降特性的影响

在CaCl2 和MgCl2 浓度为 0～ 1.0mmol L ,泥沙浓度为 10g L时 ,本文用吸管法研究了有机质对细颗粒泥沙絮凝沉降的影响 ,结果表明 :在液面下同一深度 ,有机质并不影响泥沙浓度随时间呈指数衰减的变化规律。但去除有机质后 ,细颗粒泥沙絮凝的最佳电解质浓度降低 ;对于相同的电解质浓度 ,其絮凝沉降加快 ,泥沙平均沉速明显增大

Sediment concentration of 10 g/L is prepared in 1000ml cylinder which contains CaCl 2 and MgCl 2 solutions with concentration ranging from 0 to 1.0mmol/L, and the relative sediment concentration at the depth of 20cm below suspension surface is measured with a 20-ml pipette in this paper. The results showed that sediment concentration at the same depth decreases exponentially with settling time in still water, and the change of sediment concentration with time is independent of organic matter content. Howe...