title: Model simulations of particle aggregation effect on colloid exchange between streams and streambeds.
abstract: Colloids found in natural streams have large reactive surface areas, which makes them significant absorbents and carriers for pollutants. Stream-subsurface exchange plays a critical role in regulating the transport of colloids and contaminants in natural streams. Previous process-based multiphase exchange models were developed without consideration of colloid-colloid interaction. However, many studies have indicated that aggregation is a significant process and needs to be considered in stream process analysis. Herein, a new colloid exchange model was developed by including particle aggregation in addition to colloid settling and filtration. Self-preserving size distribution concepts and classical aggregation theory were employed to model the aggregation process. Model simulations indicate that under conditions of low filtration and high degree of particle-particle interaction, aggregation could either decrease or increase the amount of colloids retained in streambeds, depending on the initial particle size. Thus, two possible cases may occur including enhanced colloid deposition and facilitated colloid transport. Also, when the aggregation rate is high and filtration increases, more particles are retained by bed sediments due to filtration, and fewer are aggregated, which reduces the extent of aggregation effect on colloid deposition. The work presented here will contribute to a better understanding and prediction of colloid transport phenomena in natural streams.
authors.affiliation: Department of Environmental Engineering, Texas A&M University-Kingsville, Kingsville, Texas 78363, United States.
authors.forename: Trachu
authors.initials: T
authors.lastname: Areepitak
authors.forename: Jianhong
authors.initials: J
authors.lastname: Ren
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D004785:Environmental Pollutants / Q000737:chemistry*; D019015:Geologic Sediments / Q000032:analysis*; D008962:Models, Theoretical; D045483:Rivers; D014872:Water Movements
chemical_list: D003102:Colloids; D004785:Environmental Pollutants