Multicomponent ionic transport simulations in a physically and electrostatically heterogeneous domain
Multicomponent ionic transport simulations in a physically and electrostatically heterogeneous domain. The results highlight the effects of charge interactions that distinctly impact the ions’ transport in the domain and their distribution among the charged and uncharged pore water. Credit: Muniruzzaman and Rolle [2019], Figure 9
Source: Water Resources Research

Traditional reactive transport models account for multiple species but disregard the electrostatic effects caused by the spatial and temporal distribution of charged species in the transport of ionic species. Muniruzzaman and Rolle [2019] focus on heterogeneous sandy-clayey porous systems and on the impact of charge interactions on transport and distribution of contaminants, including charged ions, under flow-through conditions.

The proposed approach subdivides the pore space into charge-neutral and charged zones and takes into account electrostatic effects at the surface/solution interface and between ions in the pore water. The outcomes of the flow and transport simulations show that the spatially variable physical and electrostatic properties impact the distribution and breakthrough of charged species both at the laboratory and field scales.

This is a significant and breakthrough study that opens new ways to our understanding of subsurface multi physicochemical transport phenomena. It is potentially relevant for a broad range of applications from contaminant transport to carbon storage, and from reservoir engineering to the design of repositories of radioactive wastes.

Citation: Muniruzzaman, M., & Rolle, M. [2019]. Multicomponent ionic transport modeling in physically and electrostatically heterogeneous porous media with PhreeqcRM coupling for geochemical reactions. Water Resources Research, 55, 11121– 11143.

—Xavier Sanchez-Vila, Editor, Water Resources Research

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