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Metals removal from sewage sludge by indigenous iron‐oxidizing bacteria.

Blais, Jean-François ORCID: https://orcid.org/0000-0003-3087-4318, Tyagi, Rajeshwar Dayal et Auclair, Jean-Christian (1993). Metals removal from sewage sludge by indigenous iron‐oxidizing bacteria. Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology , vol. 28 , nº 2. p. 443-467. DOI: 10.1080/10934529309375888.

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Résumé

Indigenous sewage sludge iron‐oxidizing bacteria was acclimated in twenty‐three different sludges to remove toxic metals from sewage sludge. The acclimation was carried out at pH 4.0 and 21 ± 1 °C. The required microflora was adapted in two to three successive transfers. The results showed that the oxidation of added Fe2+ in the form of FeSO4.7H2O decreased the sludge pH to 2.5 and increased oxido‐reduction potential (ORP) to 500 mV This pH reduction solubilized toxic metals to a level compatible with the recommended norms for agricultural use of the sludge. The adaptation of the microflora reduced the metal leaching period from 11–28 days to 2–10 days depending upon the sludge used. The metal leaching capacity of the adapted iron‐oxidizing bacteria was not significantly influenced by the sludge type (non‐digested sludge or aerobically or anaerobically digested sludge). Two strains of T. fenooxidans were isolated from sewage sludge, and their activity was compared with the standard strains of T. ferrooxidans (from American Type Culture Collection). The use of indigenous iron‐oxidizing bacteria resulted in the following metal solubilization efficiency: Cd: 74 ± 13%, Cr: 7 ± 8%, Cu: 60 ± 22%, Mn: 89 ± 8%, Ni: 63 ± 19%, Pb: 9 ± 8%, and Zn: 82 ±12%.

Type de document: Article
Mots-clés libres: iron oxidizing bacteria; metals removal; oxidoreduction potential; solubilization efficiency
Centre: Centre Eau Terre Environnement
Date de dépôt: 17 févr. 2021 16:17
Dernière modification: 18 févr. 2022 19:13
URI: https://espace.inrs.ca/id/eprint/11245

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