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Bench Study |
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Remediation of Chromium-Contaminated Soils:
Bench-Scale Investigation
Abstract:
"A feasibility study was performed to remediate chromium-contaminated soil by cold top ex situ vitrification.This paper describes the initial conceptualization of the research demonstration and the results from the bench-scale study... In this demonstration study, the cold top ex situ vitrification process was used to remediate the chromium-contaminated soils... Here, the chemical chromate is reduced and immobilized in a siliceous matrix. The bench-scale study included site selection, lab-scale vitrification, physical and chemical characterization of contaminated soils and vitrified soil, evaluation of potential reuse of vitrified soils as construction aggregates, and selection of two potential sites for pilot-scale testing. Nine chromium-contaminated sites were selected for this bench-scale study. The total chromium concentration in soil from the above sites ranged from 0.2 to 2.6% by weight, and the hexavalent chromium toxicity characteristic leaching procedure (TCLP) leachate was above 30 ppm in some sites. The lab-scale vitrified soils had hexavalent chromium TCLP leachate below 5ppm, the regulatory limit,and could be used as construction aggregates..."
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