2013 Fiscal Year Final Research Report
Investigation to prevent the spread of radioactive material from landfill sites disposed of sewage sludge incineration ash containing radioactive material.
| Project/Area Number |
24760426
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Iwate University |
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Principal Investigator |
ISHIKAWA Nao 岩手大学, 工学部, 助教 (10574121)
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| Research Collaborator |
UMITA Teruyuki 岩手大学, 工学部, 教授 (30117072)
ITO Ayumi 岩手大学, 大学院・工学研究科, 准教授 (90312511)
SATTA Naoya 岩手大学, 農学部, 教授 (20196207)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | セシウム / ストロンチウム / 下水汚泥焼却灰 / 埋立処分 / 収着 / 鉱物 |
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| Research Abstract |
Radionuclide contamination from the nuclear accident at Fukushima has been found in sewage sludge ash produced in eastern Japan. Such waste containing a level of radiocesium is being disposed in controlled landfill sites. Therefore, it is needed to know the leaching behavior of the radionuclides from the sewage sludge ash, factors influencing the leaching behavior, as well as to find effective sorbent for Cs and Sr to retain them in the landfill site.
In this study, leaching experiments using stable Cs and Sr were conducted for sewage sludge ash under several conditions to investigate effects of chemical composition of leachate, pH, and solid/liquid ratio on Cs and Sr leaching behavior. Then, Cs or Sr sorption test were conducted for feldspar, yellow illite, white illite, and zeolite. Finally, an extraction test using actual landfill leachate was also carried out to assess Cs and Sr retention capacity of the clay minerals in the landfill site.
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