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

静态、连续流动、水环境中聚集过程中的化学效应

• 批准号: 9814113
• 负责人: James Leckie
• 金额: $ 24.41万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814113&HistoricalAwards=false
• 关键词: Chemical; Effects; Aggregation; Processes; Quiescent

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.

CTS-9814113James O. Leckie，斯坦福大学天然水中污染物的聚集过程在实验室中使用静态、连续流动的流体柱进行实验模拟，该流体柱具有光学测量颗粒大小和速度的功能。 在延长的时间间隔内测量各种颗粒尺寸分布和水化学特性的颗粒沉降速率和聚集。 实验将使用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，以不同的浓度、在各种配体和电解质的作用下以及在不同的pH值下进行。 使用经典理论 (DLVO) 和表面络合三层模型对 Smoluchowski 方程进行数值求解并计算碰撞效率。拟议的研究与污染场地污染物的迁移和归宿以及修复方法和水处理工艺的开发相关。