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The aim of this study is to determine the intervention capacity of microorganisms in dissolving processes and in radioelement migration on radioactive waste storage sites. The cellulolytic fungus Trichoderma viride chosen as model microorganisms for microbial alteration studies of storage materials (cement and clay) and for radioelement mobilization process studies is characterized by high growth rates and acidifying activity in various medium conditions. Experiments studying absorption capacities of caesium and uranium by Trichoderma viride show that radioelement fixation is directly linked to the ratio between biomass and radioelement initial concentrations. For operational conditions considered, the maximum absorption capacities of caesium and uranium are respectively 4.37% and 2.55% of the fungus's dry biomass. In certain growing conditions, the fungus's development is accompanied by the production of polysaccharides which are also characterized by high caesium and uranium fixation capacities. Overall results obtained allow the establishment of interaction models between Trichoderma viride and caesium or uranium solutions, assessment of radioelement dissolution and mobilization factors, and development of devices necessary for the study of microorganism intervention mechanisms on radioelement mobility.

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Authors: LESSART P, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);LIBERT M F, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);SPOR H, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);BESNAINOU, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: EUR 17110 EN (1997) 117pp., FS, ECU 21.50
Availability: Available from the (2)
ISBN: ISBN 92-827-9454-7
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