Departmental Bulletin Paper 除染が容易でない放射能汚染土壌の光合成細菌を用いたバイオ除染
Polluted Soil : Alleviating Biotechnological Radioactivity Removal Difficulties Using Photosynthetic Bacteria

佐々木,慧  ,  竹野,健次  ,  新川,英典  ,  佐々木,健

48pp.67 - 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.
化学処理(硝酸処理)で除染が容易でない土壌の除染を,ビーズ状に固定化した光合成細菌,Rhodobacter sphaeroides SSI株を用いて,福島県農業総合センターにおいて実施した。これらセンターでの放射能汚染土壌の除染率は,光合成細菌と乳酸発酵,及び嫌気消化を組み合わせても,30.1-52.9%であり,福島,浪江や南相馬の腐葉土や有機質を多く含む土壌の除染(59.5-73.0%)と比較して低かった。酸処理で除染困難な土壌では,放射性セシウムは既に土壌の結晶部分に強く結びついており,ひきはがしは生物化学的処理では容易でないことが示唆された。光合成細菌での放射能除染は,腐葉土や有機質を多く含む土壌に適していると推定された。

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