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    Saline Water Bioleaching with Thermophilic Fe(Ii) Oxidizing Microorganisms

    Access Status
    Fulltext not available
    Authors
    Corbett, M.
    Collinson, D.
    Shiers, D.
    Kaksonen, A.
    Watling, H.
    Watkin, Elizabeth
    Date
    2015
    Type
    Journal Article
    
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    Citation
    Corbett, M. and Collinson, D. and Shiers, D. and Kaksonen, A. and Watling, H. and Watkin, E. 2015. Saline Water Bioleaching with Thermophilic Fe(Ii) Oxidizing Microorganisms. Advanced Materials Research. 1130: pp. 205-208.
    Source Title
    Advanced Materials Research
    DOI
    10.4028/www.scientific.net/AMR.1130.205
    ISSN
    1022-6680
    School
    School of Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/44299
    Collection
    • Curtin Research Publications
    Abstract

    The chloride tolerance of three Fe (II)- and sulfur-oxidising thermophiles and the effect of chloride on metals extraction from mineral sulfides were studied. Initially, 10-day bioleaching tests (60 °C) were conducted using pyrite (FeS2), chalcopyrite (CuFeS2) or pentlandite ((Ni,Fe)9S8) concentrates as substrate in basal salts medium (BSM), and the activities of Sulfolobus (S.) metallicus, Acidianus (A.) brierleyi and Metallosphaera (M.) hakonensis were compared. Fe (II) oxidation, as indicated by an increase in oxidation reduction potential (ORP), was observed in all combinations except A. brierleyi growing on chalcopyrite. The presence of added NaCl resulted in lower ORP after 10 days of bioleaching in all cases. In ancillary tests using BSM-Fe (II) growth medium with added NaCl it was found that cell counts at the end of Fe (II) biooxidation provided the most reliable estimate of tolerance to NaCl. On this basis, the rank order of salt tolerance is S. metallicus >>>A. brierleyi > M. hakonensis.

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