Chemical Effects in Aggregation Processes in a Quiescent, Continuous Flow, Aqueous Environment

CTS-9814113James O. Leckie，斯坦福大学在实验室中，使用具有粒径和速度光学测量能力的静态、连续流动的流体柱，对污染物在天然沃茨中的聚集过程进行了实验模拟。 在延长的时间间隔内测量各种粒度分布和水化学特性的颗粒沉降速率和聚集。 实验将在各种配体和电解质的作用下和在不同pH值下，用0.3至4微米的二氧化硅球和二氧化钛涂覆的二氧化硅球以各种浓度进行。 Smoluchowski方程的数值解和使用经典理论（DLVO）和表面络合的三层模型计算碰撞效率。拟议的研究与污染场地中污染物的迁移和归宿以及补救方法和水处理工艺的发展有关。

CTS-9814113James O. Leckie, Stanford UniversityThe aggregation processes of contaminants in natural waters are experimentally simulated in laboratory using a quiescent, continuous flow, fluid column with optical measuring capabilities for particle size and velocity. Particle settling rates and aggregation are measured over extended time intervals for various particle size distributions and water chemical characteristics. The experiments will be carried out with silica spheres and titania coated silica spheres of 0.3 to 4 microns, at various concentrations, under the effect of various ligants and electrolites and at different pH values. Numerical solution of the Smoluchowski's equation and the calculation of the collision efficiency using classical theory (DLVO) and the triple layer model for surface complexation. The proposed studies have relevance to transport and fate of contaminants in polluted sites, as well as to development of remediation methods and water treatment processes.