Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 58, Issue 3
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_2019_3
Displaying 1-13 of 13 articles from this issue
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PROPOSAL FOR SAFETY
REVIEW
TECHNICAL NOTE
  • Leaching of Radiocesium from MSW incineration ash and Countermeasure
    Naoharu Murasawa, Hikaru Sawai, Ismail Md. Mofizur Rahman, Tamao Hatta
    2019 Volume 58 Issue 3 Pages 179-188
    Published: June 15, 2019
    Released on J-STAGE: June 15, 2019
    DOIhttps://doi.org/10.18943/safety.58.3_179
    JOURNAL FREE ACCESS
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    As a result of the accident at the Fukushima Daiichi Nuclear Power Plant, radiocesium （r-Cs） has been detected in Municipal Solid Waste （MSW） incineration ash discharged from some MSW incineration plants in Fukushima Prefecture. It has been suggested that r-Cs in MSW incineration fly ash, in particular, is easily leached if it comes in contact with water. Therefore, the leaching of r-Cs from MSW incineration ash during temporary storage or after its disposal in a landfill at a final disposal site which may result in contamination is viewed as a problem. In Fukushima Prefecture, determining the leaching characteristics of r-Cs from MSW incineration ash and establishing a method to prevent its leaching from the ash are important problems. In this study, samples were collected in summer and winter from incineration plants that discharge MSW incineration ash containing r-Cs. Subsequently, experiments were done to determine their basic properties and the leaching characteristics of r-Cs. Moreover, an additional study was also performed to ascertain the possibility of using clay minerals to prevent the leaching of r-Cs from MSW incineration ash. The results showed that MSW incineration fly ash contains a high content of chlorides, which might influence the leaching of r-Cs. Moreover, mixing clay minerals in proportions from 5％ to 20％ of the amount of the sample will effectively prevent the leaching of r-Cs from MSW incineration ash.

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TECHNICAL REPORT
SAFETY MANAGEMENT AND PROVISIONS IN THE CORPORATION
SALOON
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