The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance
dc.contributor.author | Dean, Jonathan | |
dc.contributor.author | van Hille, Robert P | |
dc.contributor.author | Harrison, Susan T L | |
dc.date.accessioned | 2017-09-08T10:08:16Z | |
dc.date.available | 2017-09-08T10:08:16Z | |
dc.date.issued | 2015-11 | |
dc.description.abstract | 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 45C. 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.apacitation | Dean, 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/11427/25135 | en_ZA |
dc.identifier.chicagocitation | Dean, 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/11427/25135 | en_ZA |
dc.identifier.citation | Dean 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, 427-430 | en_ZA |
dc.identifier.issn | 1662-8985 | 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 45C. 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.uri | http://hdl.handle.net/11427/25135 | |
dc.identifier.vancouvercitation | Dean 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.iso | eng | |
dc.publisher | Trans Tech Publications | en_ZA |
dc.publisher.department | Centre for Bioprocess Engineering Research | |
dc.publisher.faculty | Faculty of Engineering and the Built Environment | |
dc.publisher.institution | University of Cape Town | |
dc.source | Advanced materials Research | en_ZA |
dc.source.uri | https://www.scientific.net/AMR/Details | |
dc.title | The microbial ecology of moderately thermophilic mineral leaching reactors: the effect of solids loading and organic carbon supplementation on reactor performance | en_ZA |
dc.type | Journal Article | en_ZA |
uct.subject.keywords | Mineral bio-oxidation | en_ZA |
uct.subject.keywords | microbial ecology | en_ZA |
uct.subject.keywords | solids loading | en_ZA |
uct.subject.keywords | organic carbon | en_ZA |
uct.type.filetype | Image | |
uct.type.filetype | Text | |
uct.type.publication | Research | en_ZA |
uct.type.resource | Article | en_ZA |