Abstract
Aluminum industry wastes are solid residues contaminated with polycyclic aromatic hydrocarbons (PAHs) and fluorides. The aluminum industry waste used in this study contained 1,129mgkg−1 of benzo(b,j,k)fluoranthene. On application of toxicity characteristic leaching procedure (TCLP), a leachate containing 448mgL−1 of fluoride ions was obtained. The decontamination of aluminum industry wastes was carried out in cycles and included a stage of flotation, followed by stabilization and neutralization. The flotation treatment in the cell containing wastes contaminated with a concentration of 15% (wv−1) in the presence of surfactant cocamydopropyl hydroxysultaine (0.25% ww−1) allowed 47 to 83% removal of benzo(b,j,k) fluoranthene. The subsequent step of lime stabilization (8% wv−1) allowed production of nonhazardous wastes. The concentration of fluoride ions resulting from the TCLP test (67mgL−1) remained lower than the permissible level (150mgL−1).
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