Transport of dissolving colloidal particles in porous media

Two-dimensional modeling of contaminant transport in porous media in the presence of colloids

“…(1) and (2). First, the amount of contaminant mass adsorbed on colloidal particles is assumed to be negligible compared to the mass of colloids [9][10][11]. Second, the effect of Brownian diffusion is not explicitly considered and is implicitly accounted for within the value of the hydrodynamic dispersion coefficient.…”

Mobilization of colloidal ferrihydrite particles in porous media—An inner-sphere complexation approach

“…Groundwater particles in the size range of a few to 100s of nanometers have been implicated in the facilitation of transport of many sparingly soluble pollutants, such as metals, radionuclides and organic compounds, in groundwater environments (McCarthy and Zachara, 1989;Ouyang et al, 1996;Kretzschmar and Sticher, 1997;Roy and Dzombak, 1997;Corapcioglu et al, 1999;Sen et al, 2004). In order to predict the movement and distribution of particle-associated pollutants, it is essential to know how particles interact with contaminants (Blesa et al, 2000;Seaman and Bertsch, 2000), and how they are mobilized.…”

Sorption/desorption kinetics of contaminants on mobile particles: Modeling and experimental evidence

“…Recent experimental studies indicate that sorption/desorption kinetics of contaminants onto/from mobile particles can significantly influence particle‐facilitated transport [e.g., Saiers and Hornberger , 1996; van de Weerd and Leijnse , 1997; Noell et al , 1998; Schüssler et al , 2001]. This is supported by several modeling studies using an empirical first‐order rate law to describe the contaminant‐particle interactions [e.g., Corapcioglu and Jiang , 1993; Ibaraki and Sudicky , 1995, Choi and Corapcioglu , 1997; van de Weerd and Leijnse , 1997; van de Weerd et al , 1998; Corapcioglu et al , 1999a]. This modeling approach has been recently extended to take into account two‐site solute adsorption to particles [ Knabner et al , 1996; Saiers and Hornberger , 1996; Schüssler et al , 2001; Saiers , 2002] Moreover, Roy and Dzombak [1998] found that a slow desorption rate of contaminants from mobile particles is probably the most important factor for enhanced solute spreading in natural systems.…”