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Microbial Diversity in Uranium Mining-Impacted Soils 101 Actinobacteria (five clones), and Proteobacteria (33 clones; library, PhyloChip data found that Proteobacteria was far Fig. 3a, b). A total of ∼23% clones in these phyla were most more abundant than other phyla, accounting for almost 46% closely related to uncultured bacteria from a variety of of the total OTUs detected.
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(1995), dedicated researcher in uranium s microbial leaching in Spain, has presented his research s results in many published papers in Elsevier. Bioleaching process, mineralogy of uranium ore, bearing rock type, level of toxic material, and leaching variables are among the factors which have been probed by him. He has worked on pitchblende ore with 0.097 %
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Microbial diversity was characterized in mining-impacted soils collected from two abandoned uranium mine sites, the Edgemont and the North Cave Hills, South Dakota, using a high-density 16S microarray (PhyloChip) and clone libraries.
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Uranium-contaminated sediment and water collected from an inactive uranium mine were incubated anaer-obically with organic substrates. Stimulated microbial populations removed U almost entirely from solution within 1 month. X-ray absorption near-edge structure analysis showed that U(VI) was reduced to U(IV) during the incubation. Observations by transmission
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Microbial Leaching of Uranium Ore Hadi Hamidian Islamic Azad University, Qaemshahr Branch Iran 1. Introduction This chapter is a review of the microbiological leaching of uranium ores. Microbiological leaching has been use as an alternative approach to conventional hydrometallurgical methods of uranium's extraction. In the microbiological leaching process, iron-oxidizing bacteria oxidize
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Uranium mining is the process of extraction of uranium ore from the ground. The worldwide production of uranium in 2019 amounted to 53,656 tonnes. Kazakhstan, Canada, and Australia were the top three producers and together account for 68% of world uranium production. Other important uranium producing countries in excess of 1,000 tonnes per year were Namibia, Niger, Russia, Uzbekistan and China. Uranium from mining is used almost entirely as fuel for nuclear power plants. Uranium is mined
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uranium mill tailings and mining piles, is of serious environmental concern. About 231000 tons of uranium were produced in Eastern Germany from 1946 to 1990 (Meinrath ., et al 2003). More than 5 x 108 tons of radioactive wastes, a total of 3000 piles and about 20 tailings had to be remediated or decontaminated (Beleites, 1992). The fate and the
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Microbial Leaching of Uranium Ore H. HAMIDIAN*, B. REZAI†, S.A. M ILANI‡, F. V AHABZADE§ and S.Z. SHAFAIE¶ Mining Engineering Department, Researches and Sciences Campus, Azad University, Tehran, Iran E-mail: [email protected]; [email protected] The rapid growth demand for power follows that nuclear power industry has led to progressive exhaustion of high grade reserves of uranium
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URANIUM MINING METHODS. Based on the current understanding of uranium deposits in the Commonwealth of Virginia, extraction of uranium ore would use open-pit mining, or underground mining, or a combination of both ().These general terms incorporate a large variety of design possibilities—there are as many methods of mining uranium as there are orebody sizes, shapes,
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REDUCTION of the soluble, oxidized form of uranium, U(VI), to insoluble U(IV) is an important mechanism for the immobilization of uranium in aquatic sediments and for the formation of some uranium ores 1-10 . U(VI) reduction has generally been regarded as an abiological reaction in which sulphide, molecular hydrogen or organic compounds function as the
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Microbial transformations of uranium in wastes and implication on its mobility Arokiasamy J. Francis Presented at the International Conference on Uranium Mining and Hydrogeology UMH V TU Bergakademie, Freiberg, Germany September 14-18, 2008 Environmental Sciences Department Environmental Research & Technology Division Brookhaven National Laboratory
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Microbes interact with uranium in multiple ways, which can be advantageous in uranium bioremediation applications. One is biosorption in which metal cations are adsorbed on the negatively charged surface of microbial cells. Also characterized by presence of metal binding ligands. Arthrobacter sp. and Bacillus sp. contain high Uranium sorption abilities as shown by
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Microbial transformations of uranium in wastes and implication on its mobility Arokiasamy J. Francis Presented at the International Conference on Uranium Mining and Hydrogeology UMH V TU Bergakademie, Freiberg, Germany September 14-18, 2008 Environmental Sciences Department Environmental Research & Technology Division Brookhaven National Laboratory P.O. Box 5000
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01.01.2005· The three steps are: (i) association of the U with organic particles (plants/algae/microbes) in the water column; (ii) provision of conditions whereby organic particles sink onto and into organic sediments; and (iii) provision of low E H (anaerobic) conditions in the sediments with metal-reducing microbial populations.
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Microbial Diversity in Uranium Mining-Impacted Soils 97 Efforts to amplify additional bacterial PCR products from Table 1 X-ray fluorescence spectroscopic analysis of major and trace elements of soil samples collected from the Edgemont and North Cave Edgemont soil were unsuccessful despite variation of Hills mine sites several parameters (e.g., annealing
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01.01.2005· Uranium mill tailings (UMT) are the crushed ore residues from the extraction of uranium (U) from ores. Among the radioactive wastes associated with the nuclear fuel cycle, UMT are unique in terms of their volume and their limited isolation from the surficial environment.
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Microbial Diversity in Uranium Mining-Impacted Soils 97 Efforts to amplify additional bacterial PCR products from Table 1 X-ray fluorescence spectroscopic analysis of major and trace elements of soil samples collected from the Edgemont and North Cave Edgemont soil were unsuccessful despite variation of Hills mine sites several parameters (e.g., annealing temperature, alternative primer sets
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12.11.2020· In uranium bioremediation, the response of different biological groups towards uranium are critical. Understanding the metal–microbe interactions would provide adequate knowledge to develop the remediation technique. Owing to this application, many studies have been reported on various strategies using different microbial agents. These microorganisms
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Microbial diversity was characterized in mining-impacted soils collected from two abandoned uranium mine sites, the Edgemont and the North Cave Hills, South Dakota, using a high-density 16S microarray (PhyloChip) and clone libraries. Characterization of the elemental compositions of soils by X-ray fluorescence spectroscopy revealed higher metal contamination including uranium at the Edgemont than at the North Cave Hills mine
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01.01.2005· The three steps are: (i) association of the U with organic particles (plants/algae/microbes) in the water column; (ii) provision of conditions whereby organic particles sink onto and into organic sediments; and (iii) provision of low E H (anaerobic) conditions in the sediments with metal-reducing microbial populations.
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