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Experimental and Numerical Studies on Colloid-Enhanced Radionuclide Transport - The Effect of Kinetic Radionuclide Sorption onto Colloidal Particles -

Published online by Cambridge University Press:  17 March 2011

Susumu Kurosawa ,
Motomu Ibaraki ,
Mikazu Yui ,
Shinzo Ueta  and
Hideki Yoshikawa
Susumu Kurosawa
Affiliation:
Tokai Works, Japan Nuclear Cycle Development Institute, Tokai-mura, Ibaraki 319-1194, Japan
Motomu Ibaraki
Affiliation:
Department of Geological Sciences, Ohio State University, Columbus, OH 43210-1308, U.S.A.
Mikazu Yui
Affiliation:
Tokai Works, Japan Nuclear Cycle Development Institute, Tokai-mura, Ibaraki 319-1194, Japan
Shinzo Ueta
Affiliation:
Energy Project and Technology Center, Mitsubishi Materials Corporation, Bunkyo-ku, Tokyo 112-0002, Japan
Hideki Yoshikawa
Affiliation:
Tokai Works, Japan Nuclear Cycle Development Institute, Tokai-mura, Ibaraki 319-1194, Japan
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Abstract

Numerous studies have shown that colloidal particles in groundwater can facilitate radionuclide transport in subsurface environments. A series of laboratory experiments was conducted to investigate the effects of radionuclide sorption onto colloids and the surfaces of rock fractures. This research especially focused on the kinetic behavior of the sorption process. A mixed solution of Cs and clay colloids was injected into a single artificial fracture in a granite column. Simulations were also performed to analyze the experimental results using a numerical code, COLFRAC, which describes colloid-facilitated solute transport in discretely-fractured media. The code allows for either equilibrium or kinetic sorption onto the colloidal particles. The experimental and analytical results indicate that transport of Cs is facilitated by the colloidal particles, which can sorb Cs and transport through the fracture. The analyses also illustrate the importance of evaluating parameters that describe kinetic sorption onto colloids. Furthermore, radionuclide transport is likely to be retarded as colloidal particles that sorb radionuclides are filtered on the fracture surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 824: Symposium CC – Scientific Basis for Nuclear Waste Management XXVIII , 2004 , CC8.40
Copyright
Copyright © Materials Research Society 2004

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