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

Simulation of the subsurface mobility of carbon nanoparticles at the field scale

“…However, numerical models have been used to investigate colloid transport in larger two-and three-dimensional systems (e.g. [34,41,4,25,27,2,3,28,36]). These studies suggest that field scale heterogeneities are important in determining the mobility of viruses and colloids in the subsurface.…”

Colloid-Associated Groundwater Contaminant Transport in Homogeneous Saturated Porous Media: Mathematical and Numerical Modeling

“…12 Sensitivity of the kinetic model to changes in initial colloid concentration, C c controversial, and it seems opposite to our hypothesis which says colloids have significant effects on contaminant transport. Bekhit and Hassan [1] studied this issue very carefully. They expressed that in the equilibrium approach model, the effect of colloids was incorporated, using a modified effective retardation factor in the conventional advection-dispersion transport equation, but in the kinetic model, we assumed that the rate coefficients to be constant independent of colloid concentration.…”

“…Bekhit and Hassan [1] developed a two-dimensional numerical model of contaminant transport in the presence of colloids. They adopted finite differences with the total variance-diminishing (TVD) scheme for solving the governing equations numerically.…”

“…Colloidal particles, ranging from 1.0 nm to 10.0 μm, have a small size and large surface area per unit volume of a colloid. Thus, they have a large number of reactive surfaces, and they could easily absorb contaminants and enhance their mobility [1].…”

DOE-EMSP Final Report: Characterization of Changes in Colloid and DNAPL Affecting Surface Chemistry and Remediation

“…Based on the visible presence of hydrophobic metal-ligand complexes, the potential for colloid-facilitated transport was considered [e.g., Prechtel, 2002;Laegdsmand, 2004 ;Bekhit, 2005;Simunek, 2006]. The variable matrix of this experiment and the observations of the phases -organic, inter and aqueous are shown in Table 5.…”