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Investigation of hexavalent chromium sorption in serpentine sediments
Thanasis Mpouras1, Maria Chrysochoou2, Dimitris Dermatas1
1School of Civil Engineering, Department of Water Resources and Environmental Engineering, National Technical University of Athens, Iroon Polytechniou 9, 157 80 Zografou, Greece.
Abstract:
In this study the removal of hexavalent chromium (Cr6+) by serpentine sediments was investigated in order to delineate Cr6+ sorption behavior in aquifers with ultramafic geologic background. Batch experiments were conducted in order to determine the influence of several parameters on Cr6+ removal, including the pH of the sediment solution, mineralogy, sediment's particle size and Cr6+ initial concentration. The results showed that Cr6+ removal was due to both adsorption and reduction phenomena. Reduction was attributed to the presence of a magnetic fraction in the sediment, mostly related to magnetite, which contributed almost 50% of the total removal in the pH range 3-7. Adsorption behavior was dominated by the finer sediment fraction (d<0.075mm). The amount of Cr6+ adsorbed was constant in the pH range 3-7, while it decreased sharply in the range 7-8.5. Cr6+ adsorption was found to increase and decrease proportionally with increasing initial Cr6+ concentration of and particle size, respectively. The linear Langmuir and Freundlich adsorption isotherms were used to describe the experimental data, with Freundlich providing a better fit to determine distribution factors for transport modeling.
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