[PAH removal from black sludge from aluminium industry by flotation using non-ionic surfactants].
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.
Dhenain
A
A
Institut national de la recherche scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la couronne, Québec, Qc, Canada.
Mercier
G
G
Blais
J F
JF
Bergeron
M
M
D000535:Aluminum / Q000737:chemistry*; D007220:Industrial Waste; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D018505:Waste Management / Q000379:methods
D007220:Industrial Waste; D011084:Polycyclic Aromatic Hydrocarbons; D012722:Sewage; D013501:Surface-Active Agents; D000535:Aluminum