Bisone, Sara; Blais, Jean-François 
ORCID: https://orcid.org/0000-0003-3087-4318; Drogui, Patrick et Mercier, Guy
(2012).
Toxic Metal Removal from Polluted Soil by Acid Extraction.
Water, Air, & Soil Pollution
, vol. 223
, nº 7.
pp. 3739-3755.
DOI: 10.1007/s11270-012-1145-1.
Résumé
Sulfuric acid leaching is a promising technique to extract toxic metals from polluted soils. The objective of this study was to define the optimum sulfuric acid leaching conditions for decontamination of the fine particle fraction (<125 μm) of an industrial soil polluted by Cd (16.8 mg kg⁻¹), Cu (3,350 mg kg⁻¹), Pb (631 mg kg⁻¹) and Zn (3,010 mg kg⁻¹). Batch leaching tests in Erlenmeyer shake flasks showed that a soil pulp pH between 1.5 and 2.0 using a solid concentration (SC) ranging from 5 to 20 % is adequate to efficiently solubilize toxic metals. Leaching tests performed at different temperatures (20, 40, 60 and 80 °C) also revealed that it is not beneficial to heat the soil suspension during the leaching treatment. The application in a 1-L stirred tank reactor of five consecutive 1-h leaching steps at 10 % SC and ambient temperature, followed by three water washings steps resulted in the following metal extraction yields: 30 % As, 90 % Cd, 43 % Co, 7 % Cr, 88 % Cu, 75 % Mn, 26 % Ni, 18 % Pb and 86 % Zn. The decontaminated soil conformed to Quebec norms for commercial and industrial use of soil.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | acid extraction; contaminated soil; metal; PAH; sequential extraction; soil-washing |
| Centre: | Centre Eau Terre Environnement |
| Date de dépôt: | 19 oct. 2018 15:05 |
| Dernière modification: | 18 févr. 2022 20:06 |
| URI: | https://espace.inrs.ca/id/eprint/7308 |
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