Authors: Bongo, G.; Mercier, G.; Drogui Et, P.; Blais, J. -F.

Source: Environmental Technology, Volume 29, Number 4, April 2008 , pp. 479-488(10)

Publisher: Taylor and Francis Ltd

Abstract:

L'industrie de production de l'aluminium genere des dechets d'aluminerie contamines en hydrocarbures aromatiques polycycliques (HAP). Le principal contaminant en HAP est le benzo(b,j,k)fluoranthene (BJK) avec des concentrations souvent superieures aux normes imposees (> 1000 mg kg-1). Cette etude visait a comparer les performances de surfactants amphoteres (BW et CAS) et non ioniques (Triton X-100 et Tween 80) a une concentration de 0.5% (p p-1) pour l'enlevement des HAP (et en particulier le BJK) lors du traitement par lavage des dechets d'aluminerie. Le meilleur rendement d'enlevement du BJK (35%) a ete obtenu pour les essais de lavage effectues en presence de CAS. Ce rendement a ete ameliore en remplacant le traitement par lavage par un procede de flottation. Les essais de flottation a differentes concentrations en CAS (0.1, 0.2, 0.25 et 0.5% p p-1) et a differentes concentrations en solides totaux de la pulpe (7, 10, 15 et 20% p v-1) ont demontre que les conditions optimales pour l'enlevement du BJK consistaient en une concentration de CAS de 0.5% et une concentration en solides totaux de 15%. Le rendement d'enlevement du BJK obtenu dans ces conditions s'eleve a 68%. La production de dechets dangereux obtenue dans ces conditions represente 10% de la masse initiale des dechets d'aluminerie. Mots cles: Dechets d'aluminerie, HAP, CAS, surfactant, flottation ABSTRACT The aluminium industry produces wastes polluted with polycyclic aromatic hydrocarbons (PAH). The most important PAH found in these wastes is benzo(b,j,k)fluoranthene (BJK) at concentrations exceeding the permitted levels (>1000 mg kg-1). The objective of this research was to compare the performances of amphoteric (BW and CAS) and non-ionic surfactants (Triton X-100 and Tween 80), at a concentration of 0.5% (w w-1), for PAH removal (and particularly for BJK) during washing treatment of aluminium industry wastes. The best removal yield of BJK (35%) has been measured during treatment with CAS. The efficiency of this surfactant has been further improved by using a flotation process. Flotation tests have also been realized at different CAS concentrations (0.1, 0.2, 0.25 and 0.5% w w-1) and using different total solids (7, 10, 15 and 20% w v-1). The highest BJK removal yield (68%) has been obtained using 0.5% CAS and a total solids concentration of 15%. The rate of hazardous wastes produced in these conditions represents 10% of the initial weight of aluminium wastes treated.

Keywords: Aluminium industry waste; PAH; CAS; surfactant; flotation

Document Type: Research article

DOI: http://dx.doi.org/10.1080/09593330801984480

Affiliations: 1: Institut national de la recherche scientifique (Centre Eau, Terre et Environnement), Quebec, Qc, Canada

Publication date: 2008-04-01

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