Recovery of ^<137>Cs by a Bioaccumulation System Using Rhodococcus erythropolis CS98

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With a bioaccumulation system using Rhodococcus erythropolis CS98 for recovery of cesium-137, we found that ^<137>Cs accumulated when a carbon source was added for energy supply. With the addition of ammonium acetate as the carbon source, almost all the ^<137>Cs from deionized water was recovered using a cell suspension of 1 g/l with incubation for 24h. Cell damage by radioactivity was not detected during the 24h period. ^<137>Cs recovery from river water samples was lower than that from deionized water, especially from river water with a very high potassium concentration(the lower reaches of the Sakura River : potassium concentration=4.3 mg/l). When 3.9 mg/l of potassium was added to a deionized water sample, ^<137>/Cs recovery decreased to 35% of that without potassium addition, suggesting that the potassium concentration is a critical factor for ^<137>Cs recovery. We conclude that a bioaccumulation system with a semipermeable membrane tube, such as is described in this paper, is feasible for the recovery of radioactive cesium from fresh waters.
社団法人日本生物工学会の論文
1998-06-25