title: Mathematical modeling of electrochemical remediation for soils under galvanostatic conditions.
abstract: This work proposes a mathematical model for the electrochemical remediation of clayey soils based on the total volume concept for a two-phase system. The mathematical formulation was done including contributions from theories for: groundwater, membranes, porous electrodes and environmental soil chemistry. The resulting model accounts for: free and complexed species in the soil matrix and the pore solution; chemical reactions taking place on either phase and/or between phases; a dynamic soil surface charge affected by the ion content of the pore solution; and electroneutrality of the total volume. Soil surface charge was included in a modified Ohm's law (voltage gradient) and in a modified Schlög's law (convective movement). Numerical implementation was done using orthogonal collocation on finite elements for spatial derivatives, and forward finite differences for time derivatives. Visual Fortran supported by IMSL subroutines was used for computer simulation. Model predictions were successfully compared with reported experimental data. Also, an analysis of pH profiles through the soil is provided for conditions when parameters including hydrostatic head, applied current density and initial pH are modified.
authors: Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa Av, Michoacán y la Purísima, Col Vicentina, Iztapalapa, México, D.F. Mexico, 09340.
authors: M M
authors: MM
authors: Teutli León
authors: M T
authors: MT
authors: Oropeza Guzmán
authors: I
authors: I
authors: González
mesh_terms: D004563:Electrochemistry; D006256:Hazardous Waste; D008433:Mathematics; D008956:Models, Chemical; D012987:Soil; D012989:Soil Pollutants; D055672:Static Electricity; D018505:Waste Management / Q000379:methods*
chemical_list: D006256:Hazardous Waste; D012987:Soil; D012989:Soil Pollutants