文档介绍：文章编号:1008-181X (2000) 04-0322-04
非点源污染物细颗粒泥沙的絮凝-分散研究
陈洪松,邵明安
(中科院、水利部水土保持研究所,陕西杨凌 712100)
摘要:细颗粒泥沙的絮凝-分散对土壤结构的稳定性,土壤中农用化合物的迁移以及侵蚀泥沙的输移、沉积有重要作用。文章概述了影响细颗粒泥沙絮凝-分散的几种主要因素——电解质种类及其浓度,矿物组成,有机质含量,pH值以及水流紊动等;指出了当前研究中存在的不足之处。
关键词:细颗粒泥沙;絮凝-分散;影响因素;非点源污染
中图分类号: 文献标识码:A
A Review on the Factors Influencing ulation and ulation
of Fine Sediment as Non-point Source Pollutants
CHEN Hong-song, SHAO Ming-an
(Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China)
Abstract: ulation and ulation of fine sediment play an important role in soil structural stability, agro-pounds movement and eroded sediment transport. In this paper, some influencing factors for fine sediment ulation and ulation, such as the type and concentration of electrolyte, position, organic matter content, soil pore fluid pH and water turbulence, are reviewed. At the same time, the weak aspects of present research are discussed.
Key words: fine sediment; ulation and ulation; influencing factors; non-point source pollution
随着人类经济活动的不断加剧,以及化肥、农药的大量使用,环境污染问题已引起了国际社会的广泛关注。土壤侵蚀可导致生态环境恶化;水环境污染是非点源污染的一种重要形式[1]。这不但是由于土壤侵蚀带来的泥沙本身就是一种非点源污染物,而且泥沙(尤其是细颗粒泥沙)是有机物、金属、铵离子、磷酸盐以及其它毒性物质的主要携带者,给受纳水体水质带来不良影响。同时,水体中的污染物也以细颗粒泥沙为载体,在水体中不断迁移转化,增加了治理难度。因此,泥沙的控制已成为非点源污染控制的一条重要途径[2, 3]。细颗粒泥沙的絮凝-分散对土壤结构的稳定性,土壤中农用化合物的迁移,以及侵蚀泥沙的输移、沉积有重要作用[4~6]。本文拟简要介绍细颗粒泥沙絮凝-