Evaluation of Particle Release from Montmorillonite Gel by Flowing Groundwater Based on the DLVO Theory

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  • KUROSAWA Susumu
    Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • NAGASAKI Shinya
    Nuclear Professional School, Graduate School of Engineering, The University of Tokyo
  • TANAKA Satoru
    Department of Quantum Engineering and Systems Sciences, Graduate School of Engineering, The University of Tokyo

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  • DLVO 理論に基づく地下水中でのモンモリロナイトゲルからの粒子の分散に関する評価
  • DLVO リロン ニ モトズク チカスイチュウ デノ モンモリロナイト ゲル カラノ リュウシ ノ ブンサン ニ カンスル ヒョウカ

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Abstract

  Theoretical study has been performed to clarify the ability of colloid release form the montmorillonite gel by the flowing groundwater. Evaluation of montmorillonite colloidal particles release from the bentonite buffer material is important for the performance assessment of radioactive waste disposal because the colloids may influence the radionuclide transport. In this study, the minimum groundwater flow rate required to tear off montmorillonite particles from surface of bentonite buffer was estimated from the shear stress on the gel front, which was calculated by the DLVO theory. The estimated shear force was converted to corresponding groundwater velocity by using Stoke's equation. The results indicated that groundwater velocity in a range of about 10−5 to 10−4 m/s would be necessary to release montmorillonite particles. This range is higher than the groundwater flow velocity found generally in deep geological media in Japan. This study suggests that the effect of montmorillonite particles release from the bentonite buffer on radionuclide transport is likely to be negligible in the performance assessment of high-level radioactive waste geological disposal.<br>

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