Testing of a near-field biogeochemical model against data from a large-scale gas generation experiment

J. S. Small, M. Nykyri, N. Paaso, U. Hovi, Merja Itävaara, Tuija Sarlin

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

A biogeochemical model that represents processes of metal corrosion, microbial degradation of cellulosic waste and mass transfer within a heterogeneous system has been used to represent processes of gas generation in a large-scale (20m3) experiment that has studied degradation of typical nuclear reactor operating waste. The experiment has been in operation for a period of about eight years and has established a pattern of methanogenic gas generation. A "blind testing" approach has been used to develop the model of the experiment using independently derived kinetic data for corrosion and microbial processes. The model correctly represents the anaerobic conditions leading to methane generation during the course of the experiment. The overall rate of gas generation of the experiment is well represented, as is the composition of evolved gases and geochemistry of sampled liquids. The experiment and the model together build confidence in the ability to simulate processes of gas generation and variation in chemical conditions in heterogeneous repository environments.
Original languageEnglish
Title of host publicationScientific Basis for Nuclear Waste Management XXIX
EditorsPierre van Iseghem
PublisherMaterials Research Society
Pages111-118
DOIs
Publication statusPublished - 2006
MoE publication typeA4 Article in a conference publication
Event29th MRS Symposium on the Scientific Basis for Nuclear Waste Management - Ghent, Belgium
Duration: 12 Sep 200516 Sep 2005
Conference number: 29

Publication series

SeriesMaterials Research Society Symposia Proceedings
Volume932
ISSN0272-9172

Conference

Conference29th MRS Symposium on the Scientific Basis for Nuclear Waste Management
CountryBelgium
CityGhent
Period12/09/0516/09/05

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    Small, J. S., Nykyri, M., Paaso, N., Hovi, U., Itävaara, M., & Sarlin, T. (2006). Testing of a near-field biogeochemical model against data from a large-scale gas generation experiment. In P. van Iseghem (Ed.), Scientific Basis for Nuclear Waste Management XXIX (pp. 111-118). Materials Research Society. Materials Research Society Symposia Proceedings, Vol.. 932 https://doi.org/10.1557/PROC-932-116.1