Practical Removal of Radioactivity from Soil in Fukushima Using Immobilized Photosynthetic Bacteria Combined with Anaerobic Digestion and Lactic Acid Fermentation as Pre-Treatment

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  • SASAKI Ken
    Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University
  • MORIKAWA Hiroyo
    Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University
  • KISHIBE Takashi
    Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University
  • TAKENO Kenji
    Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University
  • MIKAMI Ayaka
    Ohta Koukan Co., Ltd. Ohta Koukan Co., Ltd.
  • HARADA Toshihiko
    RCO Co., Ltd. RCO Co., Ltd.
  • OHTA Masahiro
    Ohta Koukan Co., Ltd. Ohta Koukan Co., Ltd.

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  • Practical removal of radioactivity from soil in Fukushima using immobilized photosynthetic bacteria combine with anaerobic digestion and lactic acid fermentation as pre-treatment
  • Practical removal of radioactivity from soil in Fukusima using immobilized photosynthetic bacteria combined with anaerobic digestion and lactic acid fermentation as pre-treatment

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Practical removal of radioactivity from polluted soil in Fukushima, Japan was done using a photosynthetic bacterium, Rhodobacter sphaeroides SSI, immobilized in alginate beads. The beads were put in a mesh bag and soaked in which soil was suspended (5 kg of soil/10 L of tap water). The radioactivity of the broth decreased by 31% after 15 d of aerobic treatment. When lactic acid bacterial culture broth was added to the suspend broth, about 50% of the radioactivity was transferred to a suspend broth fraction consisting of small particles from the soil after 3 d of fermentation and 20 s of sedimentation. The results suggest that organic matter in the soil was decomposed by anaerobic digestion and lactic acid fermentation simultaneously, and was then transferred into the liquid as small particles. With combined treatment by anaerobic digestion and lactic acid fermentation for 5 d and immobilized bead aerobic treatment for an additional 19 d, the radioactivity of suspend broth decreased by 66%. The radioactivity of the original soil (10.56 µSv/h) ultimately decreased by 67% (3.52 µSv/h) after the combined treatment.

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