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Bioleaching of Metals from Sewage Sludge by Sulfur‐Oxidizing Bacteria.

Blais, Jean-François ORCID: https://orcid.org/0000-0003-3087-4318, Tyagi, Rajeshwar Dayal et Auclair, Jean-Christian (1992). Bioleaching of Metals from Sewage Sludge by Sulfur‐Oxidizing Bacteria. Journal of Environmental Engineering , vol. 118 , nº 5. p. 690-707. DOI: 10.1061/(ASCE)0733-9372(1992)118:5(690).

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Résumé

Twenty‐three different sewage sludges were studied to adapt indigenous sulfur‐oxidizing microflora to solubilize a substantial part of trace metals from the sludges. The results showed that the oxidation of elemental sulfur into sulfuric acid with indigenous sludge thiobacilli causes a sludge acidification, lowering the pH below 2.0. This pH reduction solubilizes trace metals to a level compatible with recommended norms for agricultural use with the following metal solubilization efficiencies: Cd, 82±13%; Cr, 31±19%; Cu, 75±21%; Mn, 92±7%; Ni, 70±16%; Pb, 27±21%; and Zn, 85±10%. The adaptation of this microflora reduces the trace‐metal‐leaching period to 1.5 to five days, depending on the sludge used. The growth and metal‐leaching capacity of the adapted micro‐flora, which is a mixed culture of thiobacilli, was not significantly influenced by the sludge type (nondigested sludge, aerobically or anaerobically digested sludge) and by sludge total solids content.

Type de document: Article
Mots-clés libres: acids; sulfur; solubility; leaching; sludge; metals (chemical); sewage; bacteria
Centre: Centre Eau Terre Environnement
Date de dépôt: 17 févr. 2021 16:34
Dernière modification: 18 févr. 2022 19:12
URI: https://espace.inrs.ca/id/eprint/11255

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