有机质对细颗粒泥沙静水絮凝沉降特性的影响  

Effects of Organic Matter on Flocculation and Settling Properties of Fine Sediment in Still Water

作　　者：陈洪松[1] 邵明安[1] 

机构地区：[1]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨陵712100

出　　处：《泥沙研究》2001年第3期35-39,共5页Journal of Sediment Research

基　　金：国家自然科学基金!(5 98790 2 6 );中国科学院知识创新工程项目!(KZCX 2 411)

摘　　要：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 。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. However, when organic matter is removed by H 2O 2, optimal electrolyte concentration for fine sediment flocculation becomes lower, and fine sediment settles faster with the obvious increase of .

关 键 词：有机质 细胞粒泥沙 絮凝沉降特性 氧化钙 氯化镁 吸管法 电解质 水土流失 

分 类 号：TV141[水利工程—水力学及河流动力学] S157[农业科学—土壤学]