Exploring the potential of Gloeomargarita lithophora for radionuclides bioremediation. Exploration du potentiel de Gloeomargarita lithophora pour la bioremédiation des radionucléides

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Pamart, Edern | Benzerara, Karim | Fois, Giovanna, Rosa | Viola, Stefania | Chauvat, Franck | Cassier-Chauvat, Corinne | Chapon, Virginie

Edité par CCSD ; Elsevier -

International audience. Current physico-chemical techniques for remediating 90Sr traces from effluents are costly and can exhibit a low selectivity for Sr over Ca. Therefore, there is an incentive to develop an alternative method. In this study, we demonstrate that the cyanobacterium Gloeomargarita lithophora can rapidly remove more than 90 % of the 90Sr activity from a nuclear plant effluent within 24 h. This process occurs through two steps: a first rapid and passive phase of 90Sr sorbtion to the cell surface, followed by an active phase of 90Sr accumulation within the cells, partially driven by photosynthesis. We show that 90Sr sequestration within G. lithophora cells is stable with no release of 90Sr into the surrounding medium. Furthermore, we evidence that incorporation of 2.05×107 Bq g− 1DCW of 90Sr and exposure to an estimated dose rate of 1.7 mGy h− 1 for 5 days did not result in cell death. To go further in the development of a bioremediation method, we established the capacity to sequester 90Sr in a synthetic medium mimicking the radioactivity and mineral composition of a real industrial nuclear effluent.

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