Hydrodynamic Behavior of Colloidal Suspension as a Carrier of Hazardous Substances

胶体悬浮液作为有害物质载体的流体动力学行为

基本信息

批准号：
13556035
负责人：
ADACHI Yasuhisa
金额：
$ 6.91万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Hazardous substances of low water solubility, e.g. heavy metal and dioxin, can migrate in the water forming complexes with soil colloids such as clay and humic substances. Therefore, hydrodynamic behavior of soil colloids with potential of contaminant carrier is crucial when the system of monitoring, the scheme of assessment and the criteria of environment are considered. The present study is performed focusing this aspect placing an emphasis on the fact that hydrodynamic behavior of colloid is critically controlled by the stability of colloid Obtained results can be summarized as follows:1)The increase of excluded volume due to the formation of floc structure was turned out to be important for the description of rheological properties which are critically related to the transportation problem. This effect was experimentally verified for the kinetics of flocculation in the shear field, capillary viscometry and bridging flocculation with polyelectrolytes.2)Set-up of column experiment was established as a model system of colloid transport in the ground water. The presence of a functional form of the filtering of colloidal material against flocculation and dispersion of colloid particles and the scale of pore in the column was verified. This can be the basis for the further analysis of hydrodynamic properties of colloidal particles in relation to the rate theory of coagulation in the flow field.3)The role of organic substances such as humic substances are critical when considering the formation of complex of heavy metal on the clay surface. This is also important in the analysis of flocculation. However, very little is know about this aspect, which is the motivation of further study.

低水溶性的危险物质，例如重金属和二恶英可以在与土壤胶体（例如粘土和腐殖质物质）形成的水中迁移。因此，当考虑监测系统，评估方案和环境标准时，土壤胶体的流体动力行为至关重要。本研究的重点是重点，强调了以下事实：胶体的流体动力行为受到胶体获得的稳定性的严格控制，可以概括如下：1）由于形成拼接结构而导致的排除体积增加，这对于对与运输问题有严格相关的性质的描述非常重要。实验验证了在剪切场，毛细管粘性粘结剂和用聚电解质的桥接絮凝中的絮凝动力学。2）柱实验的设置是作为地下水中胶体运输的模型系统建立的。验证了胶体材料过滤的功能形式，以胶体颗粒的絮凝和分散胶质颗粒和色谱柱中的孔径。这可能是对胶体颗粒在流场中凝结速率理论的进一步分析的基础。3）当考虑重金属在粘土表面上形成重金属复合物时，有机物质（例如腐殖质物质）的作用至关重要。这在絮凝分析中也很重要。但是，对这一方面的了解很少，这是进一步研究的动机。