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PILOT-SCALE DECONTAMINATION OF SOIL POLLUTED WITH AS, CR, CU, PCP, AND PCDDF BY ATTRITION AND ALKALINE LEACHING
Metahni, S., L. Coudert, M. Chartier, J.-F. Blais, G. Mercier, and S. Besner.
Journal of Environmental Engineering 143(9):(2017)

The performance and the robustness of a decontamination process were evaluated for the treatment of four different contaminated soils by attrition and alkaline leaching (i.e., soil washing) at pilot scale. All the soils contained As, Cr, Cu, PCP, and PCDD/F. The attrition process first separated out the coarse particle fraction (>0.125 mm) from the different soils. Results of an additional three leaching steps conducted on the fine fraction (<0.125 mm) achieved removal yields of 87-95% of As, 50-72% of Cr, 73-84% of Cu, 52-100% of PCP, and 27-73% of PCDD/F. Although the performance of both attrition and alkaline leaching processes were influenced by the nature of the soil and the type and initial level of contaminants present, the entire leaching process allowed simultaneous reduction of inorganic and organic contaminant concentrations. Combined direct and indirect costs were estimated between $214-$454 (US) per ton of treated soil, depending on soil nature and initial contamination level. A pre-publication version of this paper is available at http://espace.inrs.ca/6351/1/P003153.pdf.



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