The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance

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dc.contributor.authorDean, Jonathan
dc.contributor.authorvan Hille, Robert P
dc.contributor.authorHarrison, Susan T L
dc.date.accessioned2016-08-19T11:47:55Z
dc.date.available2016-08-19T11:47:55Z
dc.date.issued2015
dc.date.updated2016-08-17T12:15:51Z
dc.description.abstractTank bioleaching of refractory sulphidic gold ores is well established, with potential to expand application to base metal concentrates. With increasing commercial tank bioleaching operations, understanding their microbial consortia is essential for process robustness. Recently, it has been shown that the consortia implicated in tank mineral bioleaching of gold-containing pyritic ores are dynamic, responding to the leaching environment. Factors driving the microbial dynamics of these consortia are under investigation, with emphasis also placed on determining the metabolic role of the key players in these consortia. Here, the combined influence of solids loading and organic carbon availability on microbial community dynamics and performance has been studied in agitated, aerated slurry bioreactors at 45°C. The control (autotrophic) and experimental (organic carbon added) reactors performed comparably at low solids loadings (4%, 7% and 10%). At 20% solids loadings, higher ferric iron concentrations (31 g/L vs 25g/L) and sulphide oxidation (66% vs 45%) were observed in the experimental reactor over the control. Under operating conditions used, a shift from bacterially-dominated cultures with L.ferriphilum as major species towards increasing archaeal abundance was observed. Archaeal abundance was higher in the organic carbon supplemented reactor at all solids loadings. The increased microbial diversity with organic supplementation appears to contribute to increased community robustness and associated leaching with increasing stress.en_ZA
dc.identifier.apacitationDean, J., van Hille, R. P., & Harrison, S. T. L. (2015). The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance. <i>International Biohydrometallurgy Symposium, October 2015, Bali</i>, http://hdl.handle.net/11427/21362en_ZA
dc.identifier.chicagocitationDean, Jonathan, Robert P van Hille, and Susan T L Harrison "The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance." <i>International Biohydrometallurgy Symposium, October 2015, Bali</i> (2015) http://hdl.handle.net/11427/21362en_ZA
dc.identifier.citationDean, J., van Hille, R. P., & Harrison, S. T. (2015). The Microbial Ecology of Moderately Thermophilic Mineral Leaching Reactors: The Effect of Solids Loading and Organic Carbon Supplementation on Reactor Performance. In Advanced Materials Research (Vol. 1130, pp. 427-430). Trans Tech Publications.en_ZA
dc.identifier.ris TY - Journal Article AU - Dean, Jonathan AU - van Hille, Robert P AU - Harrison, Susan T L AB - Tank bioleaching of refractory sulphidic gold ores is well established, with potential to expand application to base metal concentrates. With increasing commercial tank bioleaching operations, understanding their microbial consortia is essential for process robustness. Recently, it has been shown that the consortia implicated in tank mineral bioleaching of gold-containing pyritic ores are dynamic, responding to the leaching environment. Factors driving the microbial dynamics of these consortia are under investigation, with emphasis also placed on determining the metabolic role of the key players in these consortia. Here, the combined influence of solids loading and organic carbon availability on microbial community dynamics and performance has been studied in agitated, aerated slurry bioreactors at 45°C. The control (autotrophic) and experimental (organic carbon added) reactors performed comparably at low solids loadings (4%, 7% and 10%). At 20% solids loadings, higher ferric iron concentrations (31 g/L vs 25g/L) and sulphide oxidation (66% vs 45%) were observed in the experimental reactor over the control. Under operating conditions used, a shift from bacterially-dominated cultures with L.ferriphilum as major species towards increasing archaeal abundance was observed. Archaeal abundance was higher in the organic carbon supplemented reactor at all solids loadings. The increased microbial diversity with organic supplementation appears to contribute to increased community robustness and associated leaching with increasing stress. DA - 2015 DB - OpenUCT DP - University of Cape Town J1 - International Biohydrometallurgy Symposium, October 2015, Bali LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 T1 - The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance TI - The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance UR - http://hdl.handle.net/11427/21362 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21362
dc.identifier.vancouvercitationDean J, van Hille RP, Harrison STL. The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance. International Biohydrometallurgy Symposium, October 2015, Bali. 2015; http://hdl.handle.net/11427/21362.en_ZA
dc.languageengen_ZA
dc.publisherTrans Tech Publicationsen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceInternational Biohydrometallurgy Symposium, October 2015, Balien_ZA
dc.source.urihttp://www.scientific.net/
dc.subject.otherMicrobial Ecology
dc.subject.otherMineral Bio-Oxidation
dc.subject.otherOrganic Carbon
dc.subject.otherSolids Loading
dc.titleThe microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performanceen_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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