Recovery of 137Cs by a bioaccumulation system using Rhodococcus erythropolis CS98
1998
Tomioka, N. (National Inst. for Environmental Studies, Tsukuba, Ibaraki (Japan)) | Tanaka, K. | Uchiyama, H. | Yagi, O. | Kokufuta, E.
With a bioaccumulation system using Rhodococcus erythropolis CS98 for recovery of cesium-137, we found that 137Cs accumulated when a carbon source was added for energy supply. With the addition of ammonium acetate as the carbon source, almost all the 137CS from deionized water was recovered using a cell suspension of 1g/l with incubation for 24 h. Cell damage by radioactivity was not detected during the 24 h period. 137Cs 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, 137Cs recovery decreased to 35% of that without potassium addition, suggesting that the potassium concentration is a critical factor for 1237Cs 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
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