Environmental optimization of chromium recovery from tannery sludge using a life cycle assessment approach
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Tipus de documentArticle
Data publicació2011
EditorElsevier
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Abstract
Life cycle assessment (LCA) was used to evaluate the environmental impact of an oxidative chromium recovery method from tannery sludge, in comparison with the usual landfilling process. Three improvement
options (water reduction, byproduct use and anaerobic sludge digestion) were considered. The results showed that the proposed chromium recovery process would be better environmentally than conventional landfilling in all the evaluated impact categories if the amount of chromium recovered was 43 kg per ton of sludge. This amount could be recovered if the chromium concentration was about 20 times higher than that considered in this study. Alternatively, a lower chromium concentration would produce a better result if the recovery method was optimized and implemented at industrial rather
than laboratory scale, and if more accurate data were provided on environmental credits for avoiding the chromium production process. Thus, the recovery method is environmentally beneficial when tannery
sludge contains a chromium concentration of about 100,000 ppm. According to the literature, such concentrations are not unusual. The results could serve as the basis for further environmental improvements
in chromium recovery and tannery sludge management and should be used in decision-making processes, especially for end-of-pipe treatments.
CitacióKiliç, E. [et al.]. Environmental optimization of chromium recovery from tannery sludge using a life cycle assessment approach. "Journal of hazardous materials", 2011, vol. 192, núm. 1, p. 393-401.
ISSN0304-3894
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