Zinc recovery during refractory ore biooxidation by an indigenous consortium

Marchevsky, N.; Urbieta, María Sofía; Bernardelli, C. E.; Mas, M.; Donati, Edgardo R.

doi:10.1016/j.minpro.2015.03.009

Cited by 12 publications

(6 citation statements)

References 39 publications

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“…Prokaryotic biodiversity in geothermal environments has been studied for many years, since the height of research in Yellowstone National Park in the early 70s [ 1 , 2 ]. In all that time, the focus of interest has expanded from mere curiosity of knowing the species that thrived in environments with extreme conditions [ 3 ] to understanding their community structure and ecological role [ 4 , 5 ], to finding their connection with the origin of life on Earth or even with other planets [ 6 , 7 ], to searching novel extremophilic microorganisms that could be used to develop or improve biotechnological processes [ 8 , 9 , 10 , 11 ]. With so much potential at hand, the need for studying new areas became clear and the research of diverse geothermal environments around the world increased greatly.…”

Section: Introductionmentioning

confidence: 99%

Copahue Geothermal System: A Volcanic Environment with Rich Extreme Prokaryotic Biodiversity

et al. 2015

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The Copahue geothermal system is a natural extreme environment located at the northern end of the Cordillera de los Andes in Neuquén province in Argentina. The geochemistry and consequently the biodiversity of the area are dominated by the activity of the Copahue volcano. The main characteristic of Copahue is the extreme acidity of its aquatic environments; ponds and hot springs of moderate and high temperature as well as Río Agrio. In spite of being an apparently hostile location, the prokaryotic biodiversity detected by molecular ecology techniques as well as cultivation shows a rich and diverse environment dominated by acidophilic, sulphur oxidising bacteria or archaea, depending on the conditions of the particular niche studied. In microbial biofilms, found in the borders of the ponds where thermal activity is less intense, the species found are completely different, with a high presence of cyanobacteria and other photosynthetic species. Our results, collected during more than 10 years of work in Copahue, have enabled us to outline geomicrobiological models for the different environments found in the ponds and Río Agrio. Besides, Copahue seems to be the habitat of novel, not yet characterised autochthonous species, especially in the domain Archaea.

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Section: Introductionmentioning

confidence: 99%

Copahue Geothermal System: A Volcanic Environment with Rich Extreme Prokaryotic Biodiversity

et al. 2015

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“…The kinetics for the bioleaching of zinc was analyzed by applying the shrinking core model [7,9,28]. If bioleaching kinetics is controlled by diffusion through these products, the kinetics might be correlated graphically as Eq.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, this ore has considerable zinc content (about 8%) mainly as sphalerite which is one of the most important sources for zinc production in the world. It seems to be possible to recover zinc as a subproduct through the biooxidation pretreatment of Hualilan ore [9].…”

Section: Introductionmentioning

confidence: 99%

Improving zinc recovery by thermoacidophilic archaeon Acidianus copahuensis using tetrathionate

Castro

Donati

2016

Transactions of Nonferrous Metals Society of China

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“…Genomic DNA was obtained from the original sediment sample, the heterotrophic, autotrophic, and anaerobic enrichment cultures, and the highest As‐tolerant cultures. The protocol used is a modification of the one described in where the CTAB‐reagent was used to protect DNA integrity . Previous DNA extraction, cell pellets were prepared as follows: for sediment sample, pellet was obtained as described in Meta‐G‐Nome DNA Isolation Kit (Epicentre); for the autotrophic cultures, sulfur was removed from 5 ml of culture by filtration using a 100‐µM pore diameter membrane, the filtrate was centrifuged and the pellet formed was washed with pH 1.5 (H 2 SO 4 ) distillated sterile water; for anaerobic cultures 10 ml of culture were centrifuged at 500 g for 1 min to eliminate precipitates, the supernatant was transferred to a clean tube and centrifuged 15 min at 13,000 rpm, finally the cell pellet was washed with PBS buffer; for the heterotrophic culture 2 ml of culture were centrifuged 15 min at 13,000 rpm to form the cell pellet.…”

Section: Methodsmentioning

confidence: 99%

Arsenic‐tolerant microbial consortia from sediments of Copahue geothermal system with potential applications in bioremediation

2019

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Although arsenic (As) is recognized as a toxic element for living species, some microorganisms have the ability to tolerate and transform it; recent studies have proposed to take advantage of such capacity to develop sustainable bioremediation strategies. In this study, we evaluated the adaptation to increasing concentrations of As(III) and As(V) of three metabolically different microbial cultures (heterotrophic, autotrophic–acidophilic, and anaerobic) obtained from a sample with low‐soluble As content from the Copahue geothermal system. At the end of the adaptation process, the heterotrophic culture was able to grow at 20 mM and 450 mM of As(III) and As(V), respectively; the autotrophic–acidophilic culture showed tolerance to 15 mM of As(III) and 150 mM of As(V), whereas the anaerobic culture only developed in As(V) at concentrations up to 50 mM. The most tolerant consortia were characterized by their growth performance, complexity, and the presence of genes related to As metabolism and resistance. Regarding the consortia complexity, the predominant genera identified were: Paenibacillus in both heterotrophic consortia, Acidithiobacillus in the autotrophic–acidophilic consortium tolerant to As(III), Acidiphilium in the autotrophic–acidophilic consortium tolerant to As(V), and Thiomonas and Clostridium in the anaerobic consortium. This study is the first report of As tolerance microorganisms obtained from Copahue and reasserts the versatility and flexibility of the community of this natural extreme environment; also, it opens the door to the study of possible uses of these consortia in the design of biotechnological processes where the As concentration may fluctuate.

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Zinc recovery during refractory ore biooxidation by an indigenous consortium

Cited by 12 publications

References 39 publications

Copahue Geothermal System: A Volcanic Environment with Rich Extreme Prokaryotic Biodiversity

Copahue Geothermal System: A Volcanic Environment with Rich Extreme Prokaryotic Biodiversity

Improving zinc recovery by thermoacidophilic archaeon Acidianus copahuensis using tetrathionate

Arsenic‐tolerant microbial consortia from sediments of Copahue geothermal system with potential applications in bioremediation

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