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    Chloride ion tolerance and pyrite bioleaching capabilities of pure and mixed halotolerant, acidophilic iron- and sulfur-oxidizing cultures

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    Authors
    Khaleque, H.
    Kaksonen, A.
    Boxall, N.
    Watkin, Elizabeth
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Khaleque, H. and Kaksonen, A. and Boxall, N. and Watkin, E. 2018. Chloride ion tolerance and pyrite bioleaching capabilities of pure and mixed halotolerant, acidophilic iron- and sulfur-oxidizing cultures. Minerals Engineering. 120: pp. 87-93.
    Source Title
    Minerals Engineering
    DOI
    10.1016/j.mineng.2018.02.025
    ISSN
    0892-6875
    School
    School of Pharmacy and Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/69241
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier Ltd The search for halotolerant acidophilic microorganisms to increase the efficiency of bioleaching processes in regions of fresh water scarcity has been ongoing for the past two decades. In this study, three pure cultures (V6, V8 and M8) and four enrichment cultures (14C, L2-21, L4-9 and L6-11) from low pH, high saline environments were characterized for their ability to oxidize soluble iron and inorganic sulfur in the presence of increasing concentrations of chloride ion. The mixed cultures 14C and L2-21 contained predominantly Acidihalobacter and Acidithiobacillus spp., respectively, while L4-9 and L6-11 predominantly contained Ferroplasma spp. Cultures V6, V8, 14C and L2-21 were assessed for their ability to oxidize 1% pyrite at 9, 15 and 30 g/L chloride ion. Results showed that pure cultures V6 and V8 and mixed culture 14C were able to oxidize pyrite at chloride ion concentrations of 30 g/L, which is higher than the chloride concentration found in seawater (19 g/L). L2-21 was unable to oxidise pyrite, possibly due to the predominant presence of sulfur oxidizing microorganisms in the mixed culture. This illustrates the potential applicability of the cultures for saline water bioleaching and biooxidation of sulfide ores.

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