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

dc.contributor.authorDean, Jonathan
dc.contributor.authorvan Hille, Robert P
dc.contributor.authorHarrison, Susan T L
dc.date.accessioned2017-09-08T10:08:16Z
dc.date.available2017-09-08T10:08:16Z
dc.date.issued2015-11
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>Advanced materials Research</i>, http://hdl.handle.net/11427/25135en_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>Advanced materials Research</i> (2015) http://hdl.handle.net/11427/25135en_ZA
dc.identifier.citationDean J., van Hille R.P. and 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. Advanced Materials Research, Biotechnologies in Mining Industry and Environmental Engineering, Volume 1130, 427-430en_ZA
dc.identifier.issn1662-8985en_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 - 2015-11 DB - OpenUCT DP - University of Cape Town J1 - Advanced materials Research LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 SM - 1662-8985 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/11427/25135 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/25135
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. Advanced materials Research. 2015; http://hdl.handle.net/11427/25135.en_ZA
dc.language.isoeng
dc.publisherTrans Tech Publicationsen_ZA
dc.publisher.departmentCentre for Bioprocess Engineering Research
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.sourceAdvanced materials Researchen_ZA
dc.source.urihttps://www.scientific.net/AMR/Details
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.subject.keywordsMineral bio-oxidationen_ZA
uct.subject.keywordsmicrobial ecologyen_ZA
uct.subject.keywordssolids loadingen_ZA
uct.subject.keywordsorganic carbonen_ZA
uct.type.filetypeImage
uct.type.filetypeText
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Dean_2015.docx
Size:
63.62 KB
Format:
Microsoft Word XML
Description:
License bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.72 KB
Format:
Item-specific license agreed upon to submission
Description:
Collections