The transport of solutes through reactive porous media can be enhanced by the effect of pH-dependent adsorption/desorption processes. This effect can be particularly critical when the solutes, such as toxic metals and radionuclides, have hazardous impact on the environment and the health. To study the effect of pH-dependent adsorption/desorption on the toxic metal and radionuclide transport, we have developed an analytical and a numerical model coupling transport and surface complexation for a single-phase incompressible fluid. We have analyzed a one-dimensional (1D) system of conservation laws to account of the pH-dependence and longitudinal dispersion and to gain a physical intuition of the phenomenon as well as a 2D system to include the effect of transverse dispersion and to investigate more realistic scenarios. An important feature of these reactive transport problems is that one of the conservation laws is for the total hydrogen (cht = ch-coh), also called acidity, which gives rise to an additional nonlinearity to the systems distinguishing them from other competitive adsorption/desorption problems where hydrogen is not involved.
pH-dependent transport of energy by-products in the subsurface
Prigiobbe V.;
2013
Abstract
The transport of solutes through reactive porous media can be enhanced by the effect of pH-dependent adsorption/desorption processes. This effect can be particularly critical when the solutes, such as toxic metals and radionuclides, have hazardous impact on the environment and the health. To study the effect of pH-dependent adsorption/desorption on the toxic metal and radionuclide transport, we have developed an analytical and a numerical model coupling transport and surface complexation for a single-phase incompressible fluid. We have analyzed a one-dimensional (1D) system of conservation laws to account of the pH-dependence and longitudinal dispersion and to gain a physical intuition of the phenomenon as well as a 2D system to include the effect of transverse dispersion and to investigate more realistic scenarios. An important feature of these reactive transport problems is that one of the conservation laws is for the total hydrogen (cht = ch-coh), also called acidity, which gives rise to an additional nonlinearity to the systems distinguishing them from other competitive adsorption/desorption problems where hydrogen is not involved.
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