Chromium transport, oxidation, and adsorption in manganese-coated sand

摘要

We examine how the processes of advection, dispersion, oxidation-reduction, and adsorption combine to affect the transport of chromium through columns packed with pyrolusite (β-MnO_2)- coated sand. We find that β-MnO_2 effectively oxidizes Cr(III) to Cr(VI) and that the extent of oxidation is sensitive to changes in pH, pore water velocity, and influent concentrations of Cr(III).