It is known that uranium industry in the former Soviet Union was a centralized state management. Information flows related to the issues of uranium mining was strictly controlled and is in a vertical subordination of the structures of the Ministry of Medium Machine Building of the USSR. After the USSR collapse, the information about uranium mining and processing were not available in Kyrgyzstan...

the removal of uranium and any other heavy metals from wastewater might be achieved via several chemical or physical treatment techniques. biosorption process has been considered as a potential alternative way to remove contaminants from industrial effluents. moreover the surface of biosorbent was characterized by sem. the biosorption characteristics of uranium (vi) on pretreated a. niger were ...

Uranium foils were attached to the cathode of a glow discharge apparatus. A plasma of either hydrogen or deuterium ions was used to bombard the uranium. The rates of alpha, beta, and gamma radiation emissions were significantly greater for the bombarded uranium than for the original material.

During 2009 nuclear power plants, with a capacity of 370 GWe, will produce roughly 14% of the worldwide electric energy. About 65000 tons of natural uranium equivalent are required to operate these reactors. For 15 years on average only 2/3 of this fuel is provided by the uranium mines and 1/3 comes from secondary resources. According to the International Atomic Energy Administration (IAEA) and...

Historic data from many countries demonstrate that on average no more than 50-70% of the uranium in a deposit could be mined. An analysis of more recent data from Canada and Australia leads to a mining model with an average deposit extraction lifetime of 10±2 years. This simple model provides an accurate description of the extractable amount of uranium for the recent mining operations. Using th...

In the present study, uranium absorption capacity of Bacillus pantothenticus and Bacillus megaterium, previously isolated from the environmental air surrounding the 60Co gamma source, is reported. Pseudomonas putida and Pseudomonas chlororaphis were used as reference species. Concerning uranium uptake, the local species were more efficient than the reference ones. The maximum uptake of uranium ...

This study investigated the influence of uranium on the indigenous bacterial community structure in natural soils with high uranium content. Radioactive soil samples exhibiting 0.26% - 25.5% U in mass were analyzed and compared with nearby control soils containing trace uranium. EXAFS and XRD analyses of soils revealed the presence of U(VI) and uranium-phosphate mineral phases, identified as sa...

The in situ stimulation of Fe(III) oxide reduction by Geobacter bacteria leads to the concomitant precipitation of hexavalent uranium [U(VI)] from groundwater. Despite its promise for the bioremediation of uranium contaminants, the biological mechanism behind this reaction remains elusive. Because Fe(III) oxide reduction requires the expression of Geobacter's conductive pili, we evaluated their...

The ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6], N-ethylpyridiniumtrifluoroacetate [EtPy][CF3COO] and N-ethylpyridiniumtetrafluoroborate [EtPy][BF4], affected the reduction and precipitation of uranium by Clostridium sp. to a varying degree. Characterization of uranium association with the ionic liquids showed that uranium formed a monodentate complex with the ani...

Controlled hydrolysis of certified uranium hexafluoride, carried out in a specifically constructed aerosol chamber, leads to the production of uranyl fluoride particulates which – deposited on a graphite planchet support may be used as a quality control reference material. The particle size and surface distribution depends on several parameters, such as the relative humidity inside the aerosol ...