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The objective of the project was to provide the necessary scientific basis required for trustworthy predictive modelling of the humic colloid mediated actinide and technetium transport in natural aquifer systems. Different systems giving complementary information have been studied. These systems range from purified substances and controlled conditions via natural groundwater/sediments handled in the laboratory to analysis of data from natural aquifer systems, including natural chemical analogue studies. As far as possible, data generated rest on intercomparison between different groups and experimental methods. Models are established rationalising the developed process understanding. Models are kept as simple as possible and black-box fitting without process understanding is avoided. Humic colloids in natural aquifer systems are shown not to sorb or decompose but to be stable and mobile over time-frames relevant for radioactive waste disposal. By introduction of a kinetic concept, for the first time results from batch and column experiments can be consistently described and upscaling of column experiments is successful. Humic colloid mediated actinide transport is shown to be highly elevated compared to previous estima1es based on equilibrium concepts.

Additional information

Authors: BUCKAU G, FZK/NE, Karlsruhe (DE)
Bibliographic Reference: EUR 19610 EN (2000), 70pp, Euro: 11.50
Availability: Available from the European Commission, DG XII Communication Unit, rue de la Loi/Wetstraat 200, B-1049 Bruxelles (BE) Tel: +32-2-2950001 Fax:+32-2-2958220
ISBN: ISBN 92-828-6719-6
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