Selective recovery of nickel over iron from a nickel-iron solution using microbial sulfate reduction in a gas-lift bioreactor
2009 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 43, no 3, 853-861 p.Article in journal (Refereed) PublishedText
Process streams with high concentrations of metals and sulfate are characteristic for the mining and metallurgical industries. This study aims to selectively recover nickel from a nickel-iron-containing solution at pH 5.0 using a single stage bioreactor that simultaneously combines low pH sulfate reduction and metal-sulfide formation. The results show that nickel was selectively precipitated in the bioreactor at pH 5.0 and the precipitates consisted of >= 83% of the nickel content. The nickel-iron precipitates were partly crystalline and had a metal/sulfur ratio of 1, suggesting these precipitates were NiS and FeS. Experiments focusing on nickel recovery at pH 5.0 and 5.5 reached a recovery of >99.9%, resulting in a nickel effluent concentration <0.05 mu M. The mixed microbial population included known sulfate reducers and acetogens. This study shows that selective metal precipitation in a single stage sulfate reducing bioreactor operated at low pH has the potential to produce metal-sulfides that can be used by the metallurgical industry as a resource for metal production.
Place, publisher, year, edition, pages
IWA Publishing, 2009. Vol. 43, no 3, 853-861 p.
Metal recovery, Sulfate reduction, Metal-sulfide, Hydrogen, Nickel, Iron
Environmental Sciences Oceanography, Hydrology, Water Resources
IdentifiersURN: urn:nbn:se:umu:diva-116030DOI: 10.1016/j.watres.2008.11.023ISI: 000263658700031PubMedID: 19059621OAI: oai:DiVA.org:umu-116030DiVA: diva2:904192