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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.

低水溶性的有害物质，如重金属和二恶英，可在与土壤胶体形成复合体的水中迁移，如粘土和腐殖质。因此，在考虑监测系统、评价方案和环境标准时，具有污染物载体潜力的土壤胶体的水动力学行为至关重要。本研究就是围绕这一方面展开的，强调胶体的流体动力学行为受胶体的稳定性控制。研究结果可概括如下：1)由于絮体结构的形成而导致的排出体积的增加对于描述与输送问题密切相关的流变性是很重要的。这一效应在剪切场中的絮凝动力学、毛细管粘度计和聚电解质架桥絮凝中得到了实验验证。2)建立了胶体在地下水中运移的模型系统。验证了胶体物质过滤防止胶体颗粒的絮凝和分散的功能形式的存在和柱内孔的尺度。这可以作为进一步分析胶体颗粒的流体力学性质的基础，这与流场中的凝聚速率理论有关。3)当考虑重金属在粘土表面形成络合物时，腐殖质等有机物的作用是至关重要的。这在絮凝分析中也很重要。然而，对这方面的研究却知之甚少，这也是进一步研究的动因。