Pyrite oxidation by thermophilic archaebacteria

Larsson, Liselotte; Olsson, Gunnel; Holst, Olle; Karlsson, Hans T.

doi:10.1128/aem.56.3.697-701.1990

Cited by 62 publications

(21 citation statements)

References 10 publications

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“…Examples of sulfate and, in some cases, elemental sulfur-oxidizing organisms are found within the Sulfolobus family (Brock et al, 1972 ; Kletzin et al, 2004 ). The oxidation of organic compounds and metals has also been reported and can be associated with low pH conditions as well (Larsson et al, 1990 ).…”

Section: Hot Extremozymes: Industrial Relevance and Current Trendsmentioning

confidence: 99%

Cold and Hot Extremozymes: Industrial Relevance and Current Trends

Sarmiento¹,

Peralta²,

Blamey³

2015

Front. Bioeng. Biotechnol.

315

207

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The development of enzymes for industrial applications relies heavily on the use of microorganisms. The intrinsic properties of microbial enzymes, e.g., consistency, reproducibility, and high yields along with many others, have pushed their introduction into a wide range of products and industrial processes. Extremophilic microorganisms represent an underutilized and innovative source of novel enzymes. These microorganisms have developed unique mechanisms and molecular means to cope with extreme temperatures, acidic and basic pH, high salinity, high radiation, low water activity, and high metal concentrations among other environmental conditions. Extremophile-derived enzymes, or extremozymes, are able to catalyze chemical reactions under harsh conditions, like those found in industrial processes, which were previously not thought to be conducive for enzymatic activity. Due to their optimal activity and stability under extreme conditions, extremozymes offer new catalytic alternatives for current industrial applications. These extremozymes also represent the cornerstone for the development of environmentally friendly, efficient, and sustainable industrial technologies. Many advances in industrial biocatalysis have been achieved in recent years; however, the potential of biocatalysis through the use of extremozymes is far from being fully realized. In this article, the adaptations and significance of psychrophilic, thermophilic, and hyperthermophilic enzymes, and their applications in selected industrial markets will be reviewed. Also, the current challenges in the development and mass production of extremozymes as well as future prospects and trends for their biotechnological application will be discussed.

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Section: Hot Extremozymes: Industrial Relevance and Current Trendsmentioning

confidence: 99%

Cold and Hot Extremozymes: Industrial Relevance and Current Trends

Sarmiento¹,

Peralta²,

Blamey³

2015

Front. Bioeng. Biotechnol.

315

207

View full text Add to dashboard Cite

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“…But a further increase in the pH values to 6 and 7 caused a negative effect on the yield of desulfurization. The effect on the desulfurization process in acidic medium has been observed in the previous literature [13]. An initial pH of 5 not only increases the lag phase of the native bacterium DP06, but also promotes the precipitation of jarosites and other ferric salts on the coal surface, which would accelerate the oxidation of pyrite within…”

Section: Influence Of Initial Phmentioning

confidence: 62%

Biodesulfurization from the high sulfur coal with a newly isolated native bacterium, Aspergillus sp. DP06

Liu

Hou

Peng

2016

Env Prog and Sustain Energy

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In this paper, we made attempt to desulfurize the coal collected from Yihai coalfield of Qinghai province in China contains high total sulfur content (4.97% by mass) and high organic sulfur content (3.37% by mass). The high sulfur coal sample was subjected to desulfurization by using a new bacterium isolated from the native coal mine site. The molecular identification of the 18S rRNA gene showed that the native bacterium was Aspergillus sp., denoted as DP06, and it is reported first time for the capability to remove about 47% of total sulfur from the coal. To improve biodesulfurization performance, the effect of various parameters such as medium pH, pulp density, incubation time, and incubation temperature on the desulfurization was investigated and the optimal values were found as pH 5.0, 5% of pulp density, 8 days, and 35°C, respectively. Final total sulfur content of the desulfurized coal with DP06 was reduced to 2.63% (organic sulfur 1.45% + pyritic sulfur 0.53% and 0.65% of sulfate sulfur). Collaborative treatment high sulfur coal sample by using native bacterium DP06 and Thiobacillus ferrooxidans was studied and demonstrated 59% of total sulfur removed from the coal sample. Results of analytical characterization have indicated that the treatment of high sulfur coal with native bacterium DP06 has caused the increase in calorific value from 6329 cal/g to 6521 cal/g, but the ash content of coal was eliminated. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 595–599, 2017

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“…The direct process is analogous to Eq. 5, but the oxidizing agent of the indirect reaction is Fe 3+ (modified from Larsson et al 1990;Nordstrom et al 2000):…”

Section: Origins Of the Iron Concretions And Calcite Veinsmentioning

confidence: 99%

Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO₂‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks

Ming

Liu

et al. 2016

Geofluids

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This study investigates the Wangfu Depression of the Songliao Basin, China, as a natural analogue site for Fe migration (bleaching) and mineralization (formation of iron concretions) caused by reducing CO2‐bearing fluids that leak along fractures after carbon capture, utilization, and storage. We also examined the origin of fracture‐filling calcite veins, the properties of self‐sealing fluids, the influence of fluids on the compositions of mudstone and established a bleaching model for the study area. Our results show that iron concretions are the oxidative products of precursor minerals (pyrite and siderite) during uplift and are linked to H2S and CO2 present in early stage fluids. The precipitation of calcite veins is the result of CO2 degassing and is related to CO2, CH4, and minor heavy hydrocarbons in the main bleaching fluids. In our model, fluids preferentially enter high‐permeability fracture systems and result in the bleaching of surrounding rocks and precipitation of calcite veins. The infilling of calcite veins significantly decreases the permeability of fractures and forces the fluids to slowly enter and bleach the mudstone rocks. The Fe2+ released during bleaching migrates to elsewhere with the solutions or is reprecipitated in the calcite veins and iron concretions. The formation of calcite veins reduces the fracture space and effectively prevents fluid flow. The fluids have an insignificant effect on minerals within the mudstone. In terms of the chemistry of the mudstone, only the contents of Fe2O3, U, and Mo change significantly, with the content of U increasing in the mudstone and the contents of Fe2O3 and Mo decreasing during bleaching.

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Pyrite oxidation by thermophilic archaebacteria

Cited by 62 publications

References 10 publications

Cold and Hot Extremozymes: Industrial Relevance and Current Trends

Cold and Hot Extremozymes: Industrial Relevance and Current Trends

Biodesulfurization from the high sulfur coal with a newly isolated native bacterium, Aspergillus sp. DP06

Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO₂‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks

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Pyrite oxidation by thermophilic archaebacteria

Cited by 62 publications

References 10 publications

Cold and Hot Extremozymes: Industrial Relevance and Current Trends

Cold and Hot Extremozymes: Industrial Relevance and Current Trends

Biodesulfurization from the high sulfur coal with a newly isolated native bacterium, Aspergillus sp. DP06

Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO2‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks

Contact Info

Product

Resources

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Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO₂‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks