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Pilot-Scale Decontamination of Soil Polluted with As, Cr, Cu, PCP, and PCDDF by Attrition and Alkaline Leaching.


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Metahni, Sabrine, Coudert, Lucie, Chartier, Myriam, Blais, Jean-François, Mercier, Guy et Besner, Simon (2017). Pilot-Scale Decontamination of Soil Polluted with As, Cr, Cu, PCP, and PCDDF by Attrition and Alkaline Leaching. Journal of Environmental Engineering , vol. 143 , nº 9. 04017055. DOI: 10.1061/(ASCE)EE.1943-7870.0001255.

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Recently, an efficient and promising process was developed to allow the removal of As, Cr, Cu, pentachlorophenol (PCP), and polychlorodibenzo-dioxins and furans (PCDDF) from soil using alkaline leaching. The present study evaluates the performance and the robustness of this decontamination process for the treatment of four different polluted soils by attrition and alkaline leaching at a pilot scale. The attrition process carried out on the coarse fraction (>0.125  mm) allowed the removal of 24–42% of As, 0–13% of Cr, 23–46% of Cu, 0–85% of PCP, and 17–64% of PCDDF from the different contaminated soils. Removal yields of 87–95% of As, 50–72% of Cr, 73–84% of Cu, 52–100% of PCP, and 27–73% of PCDDF were obtained after three leaching steps ([NaOH]=1  M; [Cocamydopropylbetaine—BW]=3% (w/w); t=2  h; pulp density [PD]=10% [w/v]) conducted on the fine fraction (< 0.125  mm). The performance of both attrition and alkaline leaching processes seemed to be influenced by the nature of the soil and the type and initial level of contaminants present in the soils. However, the entire leaching process seemed to be highly efficient, allowing the simultaneous reduction of concentrations of inorganic and organic contaminants. The cost, including direct and indirect costs, were estimated between US$214 and 454 per ton of treated soil, depending on the nature of the soil and the initial level of contamination.

Type de document: Article
Mots-clés libres: alkaline leaching; attrition; contaminated soils; metal; pentachlorophenol (PCP); pilot scale; polychlorodibenzo-dioxins and furans (PCDDF)
Centre: Centre Eau Terre Environnement
Date de dépôt: 16 févr. 2018 22:09
Dernière modification: 12 avr. 2018 19:52
URI: https://espace.inrs.ca/id/eprint/6351

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