HYDRODYNAMIC DRAG EFFECTS ON DEPOSITION AND RE-ENTRAINMENT DYNAMICS OF MICROBES AND NON-BIOLOGICAL COLLOIDS DURING NON-PERTURBED TRANSPORT IN POROUS MEDIA

This presentation examines the non-perturbed deposition and re-entrainment dynamics of biological and non-biological colloids in porous media in the presence of an energy barrier to deposition at the grain surface. Deposition and re-entrainment rate coefficients were determined from numerical simulation of breakthrough-elution behavior and the profiles of retained colloids. We present composite trends from original and previously published data for biological and non-biological colloids which demonstrate that hydrodynamic drag mitigates deposition and drives re-entrainment of both biological and non-biological colloids in the presence of an energy barrier under non-perturbed conditions. These results call for the development of colloid transport theories that explicitly account for the influence of the hydrodynamic field at the grain surface.