Practical Removal of Radioactivity from Soil in Fukushima Using Immobilized Photosynthetic Bacteria Combined with Anaerobic Digestion and Lactic Acid Fermentation as Pre-Treatment
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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DOI：
10.1271/bbb.120440
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
K. Sasaki;H. Morikawa;Takashi Kishibe;K. Takeno;Ayaka Mikami;Toshihiko Harada;M. Ohta
中科院分区：
文献类型：
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作者：
K. Sasaki;H. Morikawa;Takashi Kishibe;K. Takeno;Ayaka Mikami;Toshihiko Harada;M. Ohta
日本福岛污染土壤中放射性的实际去除是使用固定在海藻酸盐珠中的光合细菌球形红杆菌SSI完成的。将珠子放入网袋中浸泡，悬浮土壤(5公斤土壤/10 L自来水)。有氧处理15d后，发酵液放射性下降了31%。在悬浮液中加入乳酸菌发酵液，发酵3d，沉淀20 S，约有50%的放射性转移到由土壤中的小颗粒组成的悬浮液中。结果表明，土壤中的有机质同时被厌氧消化和乳酸发酵分解，并以小颗粒形式转移到液体中。厌氧消化-乳酸发酵组合处理5d，固定化微珠好氧处理19d，悬浮液放射性降低66%。经过复合处理后，原土壤的放射性(10.56µSv/h)最终降低了67%(3.52µSv/h)。
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.