AI Article Synopsis
- - The study presents a model for reducing and precipitating hexavalent chromium (Cr(VI)) using electrocoagulation with iron electrodes, assuming negligible adsorption or direct reduction at low chromium concentrations.
- - A batch reactor simulation is developed to account for various chemical reactions, validated through previous experimental data, considering factors like initial chromium concentration, pH, and current density.
- - The model integrates ionic transport in MATLAB with geochemical reactions in PHREEQC and suggests specific operational parameters for effective chromium removal, indicating an ideal current density of 0.05-0.3 mA/cm.
Article Abstract
An electrocoagulation (EC) model is developed for hexavalent chromium reduction and precipitation, using iron electrodes. Parallel removal mechanisms such as adsorption of chromium on ferrihydrite and direct reduction at the cathode is assumed negligible due to low concentration of Cr(VI). The reaction model presented for batch system represents species complexation, precipitation/dissolution, acid/base, and oxidation-reduction reactions. Batch reactor simulation is verified using experimental data obtained by Sarahney et al. (2012), where the effect of initial chromium concentration, pH, volumetric current density, and ionic strength is considered (Sarahney et al., 2012). The model couples multicomponent ionic transport in MATLAB with chemical reaction model in PHREEQC, as a widely used computational programming tool and a geochemical reaction simulator with comprehensive geochemistry databases. The suggested current density is 0.05-0.3mA/cm and the surface to volume ratio in batch reactor is considered 0.017 1/cm. Design parameters are presented for operation of a flow-through hexavalent chromium removal using electrocoagulation by iron electrode to treat Cr(VI) in range of 10-50 mg/L. The operational parameters for a flow-through EC reactor for Cr(VI) removal is suggested to follow [Formula: see text] .
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| http://dx.doi.org/10.1016/j.jhazmat.2024.135195 | DOI Listing |
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