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O2 Consumption in a Granitic Environment

Published online by Cambridge University Press:  10 February 2011

I. Puigdomenech ,
L. Trotignon ,
S. Kotelnikova ,
K. Pedersen ,
L. Griffault ,
V. Michaud ,
J.-E. Lartigue ,
K. Hama ,
H. Yoshida  and
J. M. West
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I. Puigdomenech
Affiliation:
Royal Institute of Technology (KTH), Inorg. Chem., Stockholm, Sweden, ignasi@inorg.kth.se
L. Trotignon
Affiliation:
CEA, Cadarache, France
S. Kotelnikova
Affiliation:
Univ. of Göteborg, Dept. of Cell and Molecular Biology, Göteborg, Sweden
K. Pedersen
Affiliation:
Univ. of Göteborg, Dept. of Cell and Molecular Biology, Göteborg, Sweden
L. Griffault
Affiliation:
ANDRA, Chatenay-Malabry, France
V. Michaud
Affiliation:
CEA, Cadarache, France
J.-E. Lartigue
Affiliation:
CNRS, Aix-en-Provence, France
K. Hama
Affiliation:
JNC, Tono Geoscience Center, Gifu, Japan
H. Yoshida
Affiliation:
JNC, Tono Geoscience Center, Gifu, Japan
J. M. West
Affiliation:
BGS, Fluid Processes Group, Keyworth, UK
K. Bateman
Affiliation:
BGS, Fluid Processes Group, Keyworth, UK
A. E. Milodowski
Affiliation:
BGS, Fluid Processes Group, Keyworth, UK
S. A. Banwart
Affiliation:
University of Sheffield, Dept. of Civil & Structural Engineering, Sheffield, UK
J. Rivas Perez
Affiliation:
University of Bradford, Dept. of Civil & Environmental Engineering, Bradford, UK
E.-L. Tullborg
Affiliation:
Terralogica AB, Gråbo, Sweden
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Abstract

The fate of O2 in a granitic repository has been addressed by an international project: The redox experiment in detailed scale (REX). The emphasis of the project was on a field experiment involving groundwater in contact with a fracture surface. To this aim a borehole, ≍20 cm in diameter, was drilled at 380 m depth in the tunnel of the Äspö Hard Rock Laboratory, Sweden. Injection pulses of molecular oxygen were performed at in situ temperature and pressure. Several microbial and chemical parameters were studied as a function of time: microbial counts, pH, O2-concentration, Eh (redox potential), etc.

The field study has been supported by laboratory experiments to determine O2 reaction rates and mechanisms. These laboratory studies have been performed with Äspö samples (both for inorganic and microbially mediated processes). A replica experiment has also been completed at CEA, France, with the other half of the fracture surface obtained in the drilling procedure of the field experiment. The aim of the replica experiment has been to duplicate as far as possible the conditions of the REX in situ experiment, for example by using groundwater sampled at the REX site in Sweden, shipped in special containers to France.

The data that has been collected from the O2 injection pulses in the REX field and replica experiments have been compared with the rates of O2 uptake determined in the laboratory experiments. These data allow an estimate of the life-times for oxygen uptake in fractures in granitoids, which is of consequence for performance assessment calculations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 179
Copyright
Copyright © Materials Research Society 2000

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References

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