Polluted Soil : Alleviating Biotechnological Radioactivity Removal Difficulties Using Photosynthetic Bacteria
73 , 2015-12 , 広島国際学院大学
In the Fukushima Agriculture Technology Centre, an initial difficulty to remove radioactivity from polluted soil through a chemical （HNO3） treatment was remedied through one using immobilized photosynthetic bacterium beads, Rhodobactor sphaeroides SSI. Combined with lactic acid fermentation and anaerobic digestion, the removal rate（about 30%） was improved upon, but this range, by comparison, was found to be considerably lower than that for soils in the Namie and Minamisouma regions of Fukushima（59.5－73.0%）; these soils containing relatively high amount of muck or organic matter. In the case of the soil which chemical treatment is difficult, radioactive cesium already seems to have been strongly combined to the crystal moiety of the soil components, and the release of cesium is not considered effective through a biotechnological process. It was suggested that photosynthetic bacteria treatment technology for radioactivity removal is rather preferred for soils relatively rich in organic matter.