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Report No.

Iodate respiration by $$Azoarcus$$ sp. DN11 and its potential use for removal of radioiodine from contaminated aquifers

Sasamura, Seiya*; Onuki, Toshihiko*; Kozai, Naofumi   ; Amachi, Seigo*

$$Azoarcus$$ sp. DN11 previously isolated from gasoline-contaminated groundwater contained a gene cluster involved in bacterial iodate (IO$$_{3}$$$$^{-}$$) respiration. This study determined if strain DN11 performed iodate respiration and assessed its potential use to remove and sequester radioactive iodine ($$^{129}$$I) from subsurface contaminated aquifers. Strain DN11 grew anaerobically with iodate as the sole electron acceptor. After the growth of strain DN11 on iodate, silver-impregnated zeolite was added to the spent medium to remove iodide from the aqueous phase. In the presence of 200 $$mu$$M iodate as the electron acceptor, more than 98% of iodine was successfully removed from the aqueous phase. These results suggest that strain DN11 is potentially helpful for bioaugmentation of $$^{129}$$I-contaminated subsurface aquifers.



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