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PAH removal from Black Sludge from Aluminium Industry by Flotation using Non-ionic Surfactants.

Dhenain, Aurélie; Mercier, Guy; Blais, Jean-François; Bergeron, Mario (2006). PAH removal from Black Sludge from Aluminium Industry by Flotation using Non-ionic Surfactants. Environmental Technology , vol. 27 , nº 9. p. 1019-1030. DOI: 10.1080/09593332708618716.

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Résumé

The valorization of black sludge is an environmental problem of the aluminium industry because of Polycyclic Aromatic Hydrocarbon (PAH), fluoride and alumina contents. A soil washing operated in a cell flotation with non-ionic surfactants (Brij 35, Igepal CA-720, Triton X-100, Tween 80) at different concentrations has been tested in order to remove the PAH (benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(j)fluoranthene, benzo(k)fluoranthene, fluoranthene) detected in black sludge. The Tween 80 at 0.5% gave the best results with PAH removal rates between 35 and 50%. These percentages remain low due to the presence in large quantity of fine solid particles (45%) in the PAH concentrate produced by the flotation process. The substitution of the cell flotation by a column flotation allowed the reduction of this problem. Thus, the PAH removal rates reached 60%. This removal yield has been obtained with the lowest wash water flow-rate (150 ml min−1) and pulp total solids (10% p p−1) tested.

Type de document: Article
Mots-clés libres: PAH; surfactant; aluminium Industry; black sludge; flotation
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 18:26
Dernière modification: 08 janv. 2021 18:26
URI: http://espace.inrs.ca/id/eprint/10968

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