Colloid Release from Geochemically Heterogeneous Porous Media Surfaces

9705717 Elimelech这是一项奖励，用于支持对地下水含水层中胶体促进的污染物运输的研究。该项目的目标是建立一个从地下水含水层多孔介质中释放胶体颗粒的理论模型，并进行实验来评估模型的组成假设，即在离子强度降低后，胶体从化学非均质多孔介质表面释放是由胶体与胶体之间的相互作用控制的，而不是由胶体与颗粒矿物之间的相互作用控制的。实验将使用实验室柱填充多孔介质，具有不同比例的清洁和表面改性颗粒，使用明确的胶体悬浮液。该项目的结果有望提高我们对控制地下水中胶体运输和流动性的机制的基本认识。这些知识可以直接应用于地下水净化系统的工程设计，并可能在改进过滤过程、色谱分离和其他涉及颗粒与悬浮流体分离的过程的设计和操作方面具有更广泛的意义。＊＊＊

9705717 Elimelech This is an award to support research on colloid-facilitated transport of contaminants in groundwater aquifers. Objectives of the project are to develop a theoretical model for release of colloidal particles from porous media of groundwater aquifers and to conduct experiments to evaluate the model's constituent hypothesis that colloid release from chemically heterogeneous porous media surfaces following reductions in ionic strength is controlled by colloid to colloid interactions rather than by interactions between colloids and grain mineral. The experiments will be conducted using laboratory columns packed with porous media having varied ratios of clean and surface modified grains using well-defined colloidal suspensions. Results of this project are expected to improve our basic understanding of the mechanisms that control the transport and mobility of colloids in groundwater. This knowledge can be directly applied to engineering design of systems for decontamination of groundwater and may have broader significance in improving design and operation of filtration processes, chromatographic separations and other processes that involve separation of particles from fluids in which they are suspended. ***