Cesium sorption/desorption characteristics of sodium bentonite affected by major cations in leachate from MSW incinerator ash

• Inui Toru

  Graduate School of Global Environmental Studies, Kyoto University

• Katsumi Takeshi

  Graduate School of Global Environmental Studies, Kyoto University

• Takai Atsushi

  Graduate School of Global Environmental Studies, Kyoto University

抄録

The 2011 accident of Fukushima-Daiichi nuclear power plant caused radioactive contamination of surface soil and waste by fall-out of radioactive chemicals such as ¹³⁴Cs and ¹³⁷Cs. In disposal of soils and solid wastes containing low-levels of radioactive chemicals at existing MSW (municipal solid waste) landfills, installation of soil layers, such as excavated soils or bentonite amended soils, which act as sorption layers against radioactive cesium, has been planned. This manuscript addresses the results on a series of batch sorption/desorption tests to assess the effects of major cations in the leachate from MSW incinerator fly ash (MSWIFA) on the cesium sorption/desorption characteristics of sodium bentonite. The testing results indicated that major cations existing in the MSWIFA leachate such as sodium, potassium and calcium ions significantly reduced the cesium sorption capacity, and the higher concentrations led to the lower K_d values, which were two orders lower than that for the distilled water when these cation concentration was higher than 10 meq/L. Particularly, calcium ion was most likely to inhibit the fixation of cesium rather than potassium and sodium ions, and the calcium ion concentration of the leachate was a good index to explain the adverse effect on the cesium sorption. Similarly, calcium and potassium ions most significantly promoted the desorption of cesium once fixed to the bentonite, more than 30% of which was desorbed when the leachate contained 10 meq/L of calcium or potassium ions.

収録刊行物

• Japanese Geotechnical Society Special Publication

  Japanese Geotechnical Society Special Publication 2 (53), 1841-1844, 2016

  公益社団法人 地盤工学会

キーワード

• sodium bentonite
• cesium
• sorption
• desorption
• MSW incinerator fly ash

詳細情報

• CRID: 1390001205763671936
• NII論文ID: 130005124169
• DOI: 10.3208/jgssp.jpn-071
• ISSN: 21888027
• Web Site: https://www.jstage.jst.go.jp/article/jgssp/2/53/2_JPN-071/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可