Colloid-Facilitated Impurity Leaching in Statistically Homogeneous Dual-Porosity Media

Resumo

A model for the leaching of an impurity from a statistically homogeneous dual-porosity medium is proposed. The region of partial leaching grows according to a diffusion law on moderate time scales. A region completely cleaned of the impurity whose boundary moves with a constant velocity arises on long time scales. A transition region is formed at the leaching front. Its size increases proportionally to the square root of time. The possibility of a significant acceleration of the leaching process by the introduction of colloidal particles capable of adsorbing the impurity into the fluid is shown.