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Treatment of Arsenic-, Chromium-, Copper- and Pentachlorophenol-Polluted Soil Using Flotation.

Reynier, Nicolas; Blais, Jean-François; Mercier, Guy; Besner, Simon (2013). Treatment of Arsenic-, Chromium-, Copper- and Pentachlorophenol-Polluted Soil Using Flotation. Water, Air, and Soil Pollution , vol. 224 , nº 4. Article number 1514. DOI: 10.1007/s11270-013-1514-4.

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Résumé

Soils polluted by metals and organic compounds are a major challenge in soil remediation and environmental recovery; however, the technology to efficiently decontaminate soils polluted by both metal and organic pollutants does not yet exist. Most of these soils are disposed of in landfills. This study first evaluates chemical reagents (hydrochloric, nitric, sulfuric and lactic acids and ethanol) for leaching metals from soil. Assays were then conducted to evaluate non-ionic, ionic and amphoteric surfactants for pentachlorophenol (PCP) removal by flotation. Finally, a laboratory-scale leaching/flotation process was applied to treat four soil samples polluted with both organic ([PCP] i = 2.5-30 mg kg-1) and metals ([As]i = 50-250 mg kg-1, [Cr]i = 35-220 mg kg-1, [Cu] i = 80-350 mg kg-1) compounds. The organic compounds and metals are concentrated in the froth and liquid fractions, respectively. Removal yields of 82-93 %, 30-80 %, 79-90 % and 36-78 % were obtained from As, Cr, Cu and PCP, respectively, under optimized process conditions (H2SO 4 = 1 N, [cocamidopropyl betaine]i = 1 % (w w -1), t = 60 min, T = 60 C, PD = 10 % (w v-1)). The treatment of the produced leachate was also tested by chemical precipitation using different reagents.

Type de document:
Mots-clés libres: arsenic; chemical precipitation; contaminated soil; flotation; pentachlorophenol; soil washing
Centre: Centre Eau Terre Environnement
Date de dépôt: 06 déc. 2016 21:43
Dernière modification: 06 déc. 2016 21:43
URI: http://espace.inrs.ca/id/eprint/3495

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