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The Interaction of Bituminized Ion-Exchange Resins With Different Leachants

Published online by Cambridge University Press:  26 February 2011

M. Valkiainen ,
Ulla Vuorinen  and
Paula Uotila
M. Valkiainen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, Otakaari 3 A, SF-02150 Espoo, Finland
Ulla Vuorinen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, Otakaari 3 A, SF-02150 Espoo, Finland
Paula Uotila
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory, Otakaari 3 A, SF-02150 Espoo, Finland
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Abstract

Leaching tests on bituminized ion-exchange resins from Olkiluoto power plant were made according to ISO/DIS 6961 in deionized water and groundwater. Simulated waste products including Cs and Sr were leached in cement water. A clear difference is seen between the water types. With cobalt in granular resins the leach rate in groundwater is three orders of magnitude higher than in deionized water, the latter being in the order of 10–15 m/s.

The bituminized cation exchanger is still operating and changing ions with the surrounding water. Bitumen provides a hindering diffusion barrier.

Bituminized resin absorbs water from the surroundings and the weight (and volume) of the product increases 10–80 % in 898 days compared to the original value. The weight increase is slower with bituminized powdered resins than with granular resins.

Due to differencies in densities between bitumen and both anion and cation ion-exchangers, a distinct sedimentation effect of granular mixed bed exchangers is observed. The cation exchanger is separated on the bottom of the 200 1 drum while the anion exchanger is separated in the upper part of the drum.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 44: Symposium N – Scientific Basis for Nuclear Waste Management VIII , 1984 , 977
Copyright
Copyright © Materials Research Society 1985

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References

1. Heinonen, O.J. et al, Waste Management '83, 2, 177 (1983).Google Scholar
2. Long-term leach testing of radioactive waste solidification products. Draft International Standard ISO/DIS 6961 (1971).Google Scholar
3. Brodersen, K., Proposed procedure for leaching of bituminized ionexchange resin in cement conditioned water. Nordic Liaison Committee for Atomic Energy, AVF(82)212, (1982).Google Scholar