2014 Fiscal Year Final Research Report
Immobilization and decontamination of radioactive substances in soil using nano-sized smart material
| Project/Area Number |
24310059
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental technology/Environmental materials
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| Research Institution | Prefectural University of Hiroshima |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KAWAJI Takatoshi 和歌山工業高等専門学校, 物質工学科, 准教授 (30290779)
OKUDA Tetsuji 広島大学, 環境安全センター, 助教 (60343290)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | セシウム / 除染 / ナノカルシウム / 不溶化 / 放射性物質 |
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| Outline of Final Research Achievements |
In Japan, the major concern on radioactive cesium deposition and soil contamination due to the emission from the Fukushima Dai-ichi nuclear power plant showed up after a massive quake on March 11, 2011. Soil contamination with radioactive cesium has a long-term radiological impact due to its long physical half-life (30 years for 137Cs) and its high biological availability. Therefore, much attention has been paid to decontaminate Cs-polluted soil with washing and/or extraction by adopting solvents. However, such wet methods have some disadvantages, i.e. forming of secondary effluents and additional cost for their treatment. We have recently shown that the nano-size metallic calcium/calcium oxide/iron dispersing (Fe-nCa) mixture is most effective for heavy metals immobilization and volume reduction method under dry condition. Simple stirring of the contaminated soil with Fe-nCa achieved about above 90% of radioactive Cs recovery and the volume reduction level also reached around 50-60%.
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| Free Research Field |
環境化学
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