Dhenain A, Mercier G, Blais J F, Bergeron M
Institut national de la recherche scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la couronne, Québec, Qc, Canada.
Environ Technol. 2006 Sep;27(9):1019-30. doi: 10.1080/09593332708618716.
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.
由于含有多环芳烃（PAH）、氟化物和氧化铝，黑泥的资源化利用是铝工业面临的一个环境问题。为了去除黑泥中检测到的PAH（苯并(a)蒽、苯并(a)芘、苯并(b)荧蒽、苯并(j)荧蒽、苯并(k)荧蒽、荧蒽），在不同浓度下用非离子表面活性剂（Brij 35、Igepal CA - 720、Triton X - 100、吐温80）在细胞浮选过程中进行了土壤洗涤测试。0.5%的吐温80取得了最佳效果，PAH去除率在35%至50%之间。由于浮选过程产生的PAH浓缩物中存在大量细固体颗粒（45%），这些百分比仍然较低。用柱式浮选代替细胞浮选可以减少这个问题。因此，PAH去除率达到了60%。这个去除率是在测试的最低洗涤水流速（150 ml min(-1)）和矿浆总固体含量（10% p p(-1)）下获得的。
