Microbially Mediated Removal of Np (V) by Desulfovibrio desulfuricans

Nagaoka Toru

doi:10.14494/jnrs2000.6.85

Microbially Mediated Removal of Np (V) by Desulfovibrio desulfuricans

DOI 参考文献16件オープンアクセス

Nagaoka Toru

Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI)

書誌事項

タイトル別名

Implication of Microbial Immobilization at the Radioactive Waste Repository

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CiNii Books

説明

We investigated the capacity of the sulfate-reducing bacterium Desulfovibrio desulfuricans to facilitate the removal of Np (V) from aqueous solution. For comparison, we also examined the removal of Np (V) by bentonite under aerobic and anaerobic conditions with sodium sulfide. Np (V) removal (probably afteer reduction to Np (IV) ) was most rapid in the presence of cells, whereas there was little or no removal by bentonite under aerobic conditions. In the presence of cells, Np in suspension declined by 95% or more within 10h, suggesting that D. desulfuricans enzymatically reduces mobile Np (V) to immobile Np (IV) and eventually to stable Np, though chemical reduction by cell metabolite H₂S may contribute. This finding highlights the importance of understanding microbial effects when considering the migration of radioactive elements from waste repositories.