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Toxic Metal Removal from Polluted Soil by Acid Extraction.

Bisone, Sara; Blais, Jean-François; Drogui, Patrick; Mercier, Guy (2012). Toxic Metal Removal from Polluted Soil by Acid Extraction. Water, Air, & Soil Pollution , vol. 223 , nº 7. p. 3739-3755. DOI: 10.1007/s11270-012-1145-1.

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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: 19 oct. 2018 15:05
URI: http://espace.inrs.ca/id/eprint/7308

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