Microbial Processing of Metal Sulfides

Donati, Edgardo R.; Sand, Wolfgang

doi:10.1007/1-4020-5589-7

Cited by 74 publications

(6 citation statements)

References 324 publications

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“…Domestication was pursued in a 10 L pneumatically agitated reactor with 0K medium operated in batch mode with reverse flow liquid recycling with a volumetric gas flow rate of 5 × 10 -5 m 3 s -1 and a 3% w/v pulp density as detailed in Giaveno et al (2007). The reactor was inoculated (10% w/v) with the RGC acclimatized consortium in the absence of additional energy sources.…”

Section: Methodsmentioning

confidence: 99%

Domestication of Local Microbial Consortia for Efficient Recovery of Gold Through Top-Down Selection in Airlift Bioreactors

et al. 2019

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Extreme acidophiles play central roles in the geochemical cycling of diverse elements in low pH environments. This has been harnessed in biotechnologies such as biomining, where microorganisms facilitate the recovery of economically important metals such as gold. By generating both extreme acidity and a chemical oxidant (ferric iron) many species of prokaryotes that thrive in low pH environments not only catalyze mineral dissolution but also trigger both community and individual level adaptive changes. These changes vary in extent and direction depending on the ore mineralogy, water availability and local climate. The use of indigenous versus introduced microbial consortia in biomining practices is still a matter of debate. Yet, indigenous microbial consortia colonizing sulfidic ores that have been domesticated, i.e., selected for their ability to survive under specific polyextreme conditions, are claimed to outperform un-adapted foreign consortia. Despite this, little is known on the domestication of acidic microbial communities and the changes elicited in their members. In this study, high resolution targeted metagenomic techniques were used to analyze the changes occurring in the community structure of local microbial consortia acclimated to growing under extreme acidic conditions and adapted to endure the conditions imposed by the target mineral during biooxidation of a gold concentrate in an airlift reactor over a period of 2 years. The results indicated that operative conditions evolving through biooxidation of the mineral concentrate exerted strong selective pressures that, early on, purge biodiversity in favor of a few Acidithiobacillus spp. over other iron oxidizing acidophiles. Metagenomic analysis of the domesticated consortium present at the end of the adaptation experiment enabled reconstruction of the RVS1-MAG, a novel representative of Acidithiobacillus ferrooxidans from the Andacollo gold mineral district. Comparative genomic analysis performed with this genome draft revealed a net enrichment of gene functions related to heavy metal transport and stress management that are likely to play a significant role in adaptation and survival to adverse conditions experienced by these acidophiles during growth in presence of gold concentrates.

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Section: Methodsmentioning

confidence: 99%

Domestication of Local Microbial Consortia for Efficient Recovery of Gold Through Top-Down Selection in Airlift Bioreactors

et al. 2019

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“…En años recientes el desarrollo de procesos microbiológicos para la extracción de los metales desde cuerpos mineralizados ha generado mucho interés y el acercamiento a los procesos de biotecnológicos como la biooxidación, que ya se aplican en muchas partes del mundo. Son las razones fundamentales para la investigación y para otorgar estímulos a los nuevos descubrimientos y; además, probablemente se convierta en la causa del desarrollo del sector minero metalúrgico (Sand et al, 1995;(Donati & Sand, 2007).…”

Section: Antecedentes De Los Bioprocesosunclassified

Correlación del potencial óxido reducción y la población bacteriana durante el estudio de biolixiviación de sulfuros de cobre

Arce

Dávila

Paucarima

et al. 2021

Rev. Inst. investig. Fac. minas metal cienc. geogr

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Se estudio la correlación de las variables población bacteriana y potencial de óxido reducción (ORP) en la biolixiviación de minerales sulfurados mediante cepa bacteriana de Acidithiobacilus Ferrooxidans aisladas a partir de efluente ácido de mina, buscando la solubilización del cobre y la liberación del oro presente en un mineral con sulfuros superior a 80%. Las variables de experimentación fueron: La densidad de pulpa a 1, 2 y 6 % (W/V), concentración de sulfato ferroso como parte del medio 9k de 0, 3, 6, 9 y 15 gr/L; manteniendo constante la temperatura, agitación del medio y el pH. Los ensayos se realizaron en tres etapas consecutivas, iniciándose con inoculo conteniendo 7.05x107 Cel/mL y luego, la obtenida en cada etapa previa, observándose la variación en los periodos de adaptación y crecimiento. En la primera etapa la máxima población bacteriana alcanzada fue de 4.75x107 Cel/mL en 24 días con 6 g/L de sulfato ferroso. En la segunda etapa se obtuvo una máxima densidad de 6.30x107 Cel/mL sin la adición de sulfato ferroso. En la tercera etapa la densidad bacteriana alcanzada fue de 4.51x107 Cel/mL., con inicios de crecimiento exponencial aproximadamente a los 13, 8 y 3 días, respectivamente. Las cepas bacterianas fueron adaptadas satisfactoriamente en distintos medios conteniendo cantidades variadas de hierro y minerales sulfurados, dando mejores resultados sin la adición de sulfato ferroso.

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“…The most described sulfur-oxidizing acidophiles are classified as Bacteria and are mostly mesophilic and moderately thermophilic. Archaea are the second most described microorganisms and are mostly extremely thermophilic (except for the Ferroplasma genus) . All these microorganisms can oxidize Fe 2+ or reduced sulfur compounds; however, only a few grow chemolithoautotrophically .…”

Section: Introductionmentioning

confidence: 99%

“…Archaea are the second most described microorganisms and are mostly extremely thermophilic (except for the Ferroplasma genus) . All these microorganisms can oxidize Fe 2+ or reduced sulfur compounds; however, only a few grow chemolithoautotrophically . The microorganisms in Table are mesophiles, moderate thermophiles, and thermophiles.…”

Section: Introductionmentioning

confidence: 99%

Toward Sustainable Solution for Biooxidation of Waste and Refractory Materials Using Neutrophilic and Alkaliphilic Microorganisms—A Review

Lee

Mahandra

Hein

et al. 2021

ACS Appl. Bio Mater.

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The significant increase in economic concern and environmental restrictions has resulted in increasing interest in biotechnological solutions. The application of acidophilic, sulfur-oxidizing microorganisms in biomining and in the treatment of waste matrices has been extensively explored. However, to surmount the current challenges encountered by the industrial use of acidophiles, there is an opportunity for neutrophilic and alkaliphilic microorganisms to be comprehensively considered for the biooxidation of refractory sulfide materials. This review, for the first time, provides a detailed study of neutrophiles and alkaliphiles that have potential for oxidizing sulfur-containing wastes and sulfide refractory ores to recover entrapped metals especially gold in a sustainable manner. The study illustrates the applicability of neutrophilic and alkaliphilic microorganisms to provide better and sustainable alternatives for the recovery of metals from wastes from various sources as well as refractory materials. The microorganisms summarized in this review have been successfully used in oxidizing different sulfide sources by achieving high oxidizing efficiencies (>80%) in numerous technologies. The fundamentals of biooxidation along with possible mechanisms involved in the biooxidation have been discussed in detail.

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Microbial Processing of Metal Sulfides

Cited by 74 publications

References 324 publications

Domestication of Local Microbial Consortia for Efficient Recovery of Gold Through Top-Down Selection in Airlift Bioreactors

Domestication of Local Microbial Consortia for Efficient Recovery of Gold Through Top-Down Selection in Airlift Bioreactors

Correlación del potencial óxido reducción y la población bacteriana durante el estudio de biolixiviación de sulfuros de cobre

Toward Sustainable Solution for Biooxidation of Waste and Refractory Materials Using Neutrophilic and Alkaliphilic Microorganisms—A Review

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