| Project/Area Number |
25550058
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental engineering and reduction of environmental burden
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| Research Institution | Prefectural University of Hiroshima |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 環境材料 / 廃棄物処理 / 焼却灰 / セシウム / ナノカルシウム / 放射性物質 |
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| Outline of Final Research Achievements |
In this work, the capability of nanometallic Ca/CaO methanol suspension in removing and /or immobilizing stable cesium (133Cs) and radioactive cesium species (134Cs and 137Cs) in contaminated fly ash was investigated. After a first methanol and second water washing yielded only 45% of 133Cs removal. While, after a first methanol washing, second solvent with nanometallic calcium Ca/CaO methanol suspension yielded simultaneous enhanced removal and immobilization about 99% of 133Cs. SEM-EDS analysis revealed that the mass percent of detectable 133Cs on the fly ash surface recorded a 100% decrease. When real radioactive Cs contaminated fly ash (containing the initial 14,040 Bq/kg 134Cs and 137Cs cumulated concentration) obtained from burning waste from Fukushima were reduced to 3,583 Bq/kg after the treatment with nanometallic Ca/CaO methanol suspension. Elution test conducted on the treated fly ash gave 100 Bq/L total 134Cs and 137Csconcentration in eluted solution.
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