Removal and Recovery of Uranium using Microorganisms Isolated from Japanese Uranium Deposits

概要

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Attempts were made to remove and to recover uranium present in nuclear fuel effluents and mine tailings using microorganisms isolated from a Japanese uranium mine. Hundreds strains of microorganisms were screened to establish which microorganisms removed the most uranium. Of the tested microorganism strains, an extremely high uranium removing ability was found in some bacteria, including Lactobacillus sp., which can remove about 2,200 μmol uranium per gram dry wt. of microbial cells within one hour. These microbial cells can remove uranium from the uranium refining wastewater with a high efficiency. Lactobacillus cells can remove more uranium from seawater than the other microorganisms which have superior uranium removing capacities from non-saline uranium solutions. The Lactobacillus cells immobilized with a polyacrylamide gel have excellent handling characteristics and can be repeatedly used in the adsorption-desorption cycles. The Lactobacillus cells can be used as an adsorbing agent for the removal and recovery of uranium present in nuclear fuel effluents, mine tailings, seawater, and other waste sources.
一般社団法人日本原子力学会の論文
2006-08-25