The effect of temperature and culture history on the attachment of Metallosphaera hakonensis to mineral sulfides with application to heap bioleaching

Bromfield, Lucinda; Africa, Cindy-Jade; Harrison, Susan T.L.; Hille, Robert P. van

doi:10.1016/j.mineng.2011.03.019

Cited by 23 publications

(7 citation statements)

References 33 publications

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“…The majority of studies, related to mineral sulfides, focused on attachment parameters of temperature and culture history, the influence of planktonic and attached cells on the dissolution process, visualizing pyrite leaching, and biofilm development [324][325][326][327]. As is the case for other acidophilic metal mobilizers, EPS plays an important role in the adhesion to solid mineral substrates for extreme thermoacidophiles [34,39,283,328].…”

Section: Attachment Of Extreme Thermoacidophiles To Surfacesmentioning

confidence: 99%

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

et al. 2015

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Extreme thermoacidophiles (Topt > 65 °C, pHopt < 3.5) inhabit unique environments fraught with challenges, including extremely high temperatures, low pH, as well as high levels of soluble metal species. In fact, certain members of this group thrive by metabolizing heavy metals, creating a dynamic equilibrium between biooxidation to meet bioenergetic needs and mechanisms for tolerating and resisting the toxic effects of solubilized metals. Extremely thermoacidophilic archaea dominate bioleaching operations at elevated temperatures and have been considered for processing certain mineral types (e.g., chalcopyrite), some of which are recalcitrant to their mesophilic counterparts. A key issue to consider, in addition to temperature and pH, is the extent to which solid phase heavy metals are solubilized and the concomitant impact of these mobilized metals on the microorganism's growth physiology. Here, extreme thermoacidophiles are examined from the perspectives of biodiversity, heavy metal biooxidation, metal resistance mechanisms, microbe-solid interactions, and application of these archaea in biomining operations.

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Section: Attachment Of Extreme Thermoacidophiles To Surfacesmentioning

confidence: 99%

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

et al. 2015

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“…A statistical analysis of the difference between the repeated tests suggested that the mean concentration curves for each test were within the 95% confidence interval of each other and the difference was not significant. The results of the attachment studies [17][18][19][20] presented in Table 1 may be used to inform and compare the initial microbial retention on low-grade ore, however, these studies do not provide microbial abundance or leaching data. The larger scale column work on low-grade ore [24][25][26]29] presents microbial abundance and diversity data at the termination of the experiments.…”

Section: Reproducibility Of Results At Base Case Conditionsmentioning

confidence: 99%

“…Table 1 provides a summary of design conditions for selected lab-scale studies focused on microbial attachment and colonisation of low-grade ore in a heap environment. Microbial attachment studies on low-grade ore have been performed at the particle scale, in a biofilm reactor system [17,18], and at the agglomerate-scale, in glass column reactors loaded with geo-coated glass beads [19,20]. Authors observed preferential attachment to sulphide minerals; more specifically, pyrite over chalcopyrite and low-grade ore, and localised attachment to surface defects irrespective of the mineral, for mesophiles Acidithiobacillus (At.)…”

Section: Introductionmentioning

confidence: 99%

A novel experimental system for the study of microbial ecology and mineral leaching within a simulated agglomerate-scale heap bioleaching system

Govender

Bryan

Harrison

2015

Biochemical Engineering Journal

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Heap bioleaching systems are complex, with multiple sub-processes interacting at various scales within the heterogeneous reaction environment. This provides a challenge to determining the growth characteristics of micro-organisms and reaction characteristics of the mineral ore in a representative environment. The experimental system presented in this paper was designed to simulate heap bioleaching conditions using multiple, identically constructed agglomerate-scale mini-column reactors. Ore samples were prepared representatively as grab samples of a larger heap. Particle size distributions and agglomerate masses of the prepared ore samples were shown to be similar within acceptable variance and provided comparable surface areas for microbial colonisation and chemical reaction. The microbial abundance within the whole ore system was determined from effluent sampling for the planktonic population and the systematic and sequential sacrifice of identically operated mini-column reactors to determine the change in the ore-associated microbial population with time. Microbial colonisation and growth rate kinetics were determined from analysis of these populations. The growth curves obtained for the bulk flowing solution and ore-associated populations at the base case operating conditions were reproducible, within a 95 % confidence interval.

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“…Temperature affects biological processes (Aragno 1981 ; Karhu et al 2014 ; Williamson et al 2016 ; Zhou et al 2016 ), via changing microbial community composition, structure and diversity. Furthermore, temperature could alter the activity of enzymes (Bromfield et al 2011 ; Razavi et al 2017 ). In addition, temperature could alter the chemical dissolution speed of mineral (Chen et al 2014 ) and the solubility of bioleaching of product (e.g., jarosite and calcium sulfate) (Sand et al 2001 ).…”

Section: Discussionmentioning

confidence: 99%

Responses of zinc recovery to temperature and mineral composition during sphalerite bioleaching process

et al. 2017

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Temperature and energy resources (e.g., iron, sulfur and organic matter) usually undergo dynamic changes, and play important roles during industrial bioleaching process. Thus, it is essential to investigate their synergistic effects and the changes of their independent effects with simultaneous actions of multi-factors. In this study, we explored the synergistic effects of temperature and original mineral compositions (OMCs, energy resources) on the sphalerite bioleaching process. The microbial community structure was monitored by 16S rRNA gene sequencing technology and showed clear segregation along temperature gradients and Shannon diversity decreased at high temperature. On the contrary, the physicochemical parameters (pH and [Fe3+]) in the leachate were significantly affected by the OMCs. Interestingly, the influence of temperature on zinc recovery was greater at relatively simpler OMCs level, whereas the influence of OMCs was stronger at lower temperature. In addition, using [Fe3+], pH, relative abundances of dominant OTUs of microbial community and temperature as variable parameters, several models were constructed to predict zinc leaching efficiency, providing a possibility to predict the metal recovery efficiency under temperature change and variable energy resources.Electronic supplementary materialThe online version of this article (doi:10.1186/s13568-017-0491-1) contains supplementary material, which is available to authorized users.

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The effect of temperature and culture history on the attachment of Metallosphaera hakonensis to mineral sulfides with application to heap bioleaching

Cited by 23 publications

References 33 publications

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

A novel experimental system for the study of microbial ecology and mineral leaching within a simulated agglomerate-scale heap bioleaching system

Responses of zinc recovery to temperature and mineral composition during sphalerite bioleaching process

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