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Simultaneous removal of Cu and PAHs from dredged sediments using flotation.

Palakkeel Veetil, Dileep; Mercier, Guy; Blais, Jean-François; Chartier, Myriam; Tran, Lan Huong (2013). Simultaneous removal of Cu and PAHs from dredged sediments using flotation. Journal of Soils and Sediments , vol. 13 , nº 8. p. 1502-1514. DOI: 10.1007/s11368-013-0737-8.

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Résumé

Purpose: This study addresses the feasibility of a flotation technique, using a lab-scale flotation cell, to simultaneously remove both metals and polyaromatic hydrocarbons (PAHs) from fine sediment fractions (< 250 μm) that are potentially contaminated with copper (Cu). Materials and methods: A multiple flotation process with three consecutive flotation stages was performed on three sediments (13S, 14B, and 24A) with different particle size distributions, Cu and PAH concentrations, and organic matter contents. Results and discussion: Flotations performed under selected conditions allowed for significant removal of both Cu (61-70 %) and PAHs (75-83 %) with acceptable froth recoveries of approximately 23-29 %. Removal rates for arsenic, lead, and zinc were 48-61, 40-48, and 32-36 %, respectively. Flotation selectivity of Cu was greatly influenced by the contents of fine particles and organic matter of the sediments. The maximum flotation selectivity was obtained for the 53-125-μm size fraction. The high flotation selectivity of Cu (2.5-3.2) and PAHs (3.0-3.6) demonstrated the feasibility of flotation to treat soils or sediments containing both organic and inorganic pollutants. Conclusions: Overall, the flotation results showed a high selectivity for both Cu and PAHs and demonstrated the feasibility of flotation to treat media contaminated with organic and inorganic contaminants.

Type de document:
Mots-clés libres: contaminated sediments; copper; flotation; PAH; removal
Centre: Centre Eau Terre Environnement
Date de dépôt: 06 déc. 2016 21:41
Dernière modification: 06 déc. 2016 21:41
URI: http://espace.inrs.ca/id/eprint/3486

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