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Laboratory-Scale Flotation Process for Treatment of Soils Contaminated with Both PAH and Lead.

Mouton, Julia; Mercier, Guy; Blais, Jean-François (2010). Laboratory-Scale Flotation Process for Treatment of Soils Contaminated with Both PAH and Lead. Journal of Environmental Engineering , vol. 136 , nº 10. p. 1063-1074. DOI: 10.1061/(ASCE)EE.1943-7870.0000249.

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Résumé

A soil decontaminating process has been studied at laboratory scale for the treatment of one soil polluted by both polycyclic aromatic hydrocarbons (PAHs) and lead (Pb). This process first includes attrition and sieving steps to separate the coarse (>2 mm) from the fine (<2 mm) fractions, followed by a flotation step using an amphoteric surfactant in acid and saline conditions for the treatment of the fine contaminated particles. Electrodeposition and chemical precipitation using sodium hydroxide have been compared to ensure a possible reuse of wastewaters without disturbing the efficiency of the process. The performance of the process has been estimated considering soil quality after treatment with respect to the limit regulatory levels for commercial or industrial use in Quebec (Canada). Precipitation of lead hydroxides was efficient after five cycles of wastewaters reuse, while electrodeposition did not maintain efficiency of the flotation step with regard to PAH levels in soil after treatment. The complete process including Pb precipitation ensured the removal of 89±8 and 76±10% of total PAH, respectively, for the coarse (>2 mm) and fine (<2 mm) fractions, while Pb was removed at 88±10 and 65±2%, respectively, for the same fractions of the soil.

Type de document: Article
Mots-clés libres: lead (chemical); chemical processes; soil pollution; pollution; particle pollution; hydrocarbons; precipitation; soil treatment; Quebec; Canada
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 19:25
Dernière modification: 08 janv. 2021 19:25
URI: http://espace.inrs.ca/id/eprint/10684

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