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waste site


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waste site

waste sites

waste site

Siting Nuclear Waste Repositories

Federal Ruling Requires Million-Year Guarantee of Safety at Yucca Mountain Nuclear Waste Site

DRINK: a biogeochemical source term model for low level radioactive waste disposal sites

Leachates from municipal solid waste disposal sites harbor similar, novel nitrogen-cycling bacterial communities

Radiation protection, radioactive waste management and site monitoring at the nuclear scientific experimental and educational centre IRT-Sofia at INRNE-BAS

Three oligotrophic bacterial strains were cultured from the ground water of the deep-well monitoring site S15 of the Siberian radioactive waste depository Tomsk-7, Russia. They were affiliated with Actinobacteria from the genus Microbacterium. The almost fully sequenced 16S rRNA genes of two of the isolates, S15-M2 and S15-M5, were identical to those of cultured representatives of the species Microbacterium oxydans. The third isolate, S15-M4, shared 99.8% of 16S rRNA gene identity with them. The latter isolate possessed a distinct cell morphology as well as carbon source utilization pattern from the M. oxydans strains S15-M2 and S15-M5. The three isolates tolerated equal amounts of uranium, lead, copper, silver and chromium but they differed in their tolerance of cadmium and nickel. The cells of all three strains accumulated high amounts of uranium, i.e. up to 240 mg U (g dry biomass)−1 in the case of M. oxydans S15-M2. X-ray absorption spectroscopy (XAS) analysis showed that this strain precipitated U(VI) at pH 4.5 as a meta-autunite-like phase. At pH 2, the uranium formed complexes with organically bound phosphate groups on the cell surface. The results of the XAS studies were consistent with those obtained by transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX)

 

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Large quantities of waste are dumped in waste sites, which fall into several categories, including garbage dumps, landfill, toxic waste sites, radioactive waste sites, etc. Most troublesome are toxic waste sites containing poisonous chemicals and radioactive waste. These are ultimately the most costly and dangerous because of the extremely long half-life of some radioactive waste. There are an estimated 100,000 toxic waste sites in the United States. Many are poorly documented, unsupervised, and unregulated.

Subjects: Public Health and Epidemiology.


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