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Modelling Biochemical Processes in Rocks: Analysis and exploratory simulations of competition of different processes important for ferrous mineral oxidation and oxygen depletion

Published online by Cambridge University Press:  01 February 2011

Magnus Sidborn  and
Ivars Neretnieks
Magnus Sidborn
Affiliation:
Department of Chemical Engineering and Technology, Royal Institute of Technology, S-10044 Stockholm, Sweden
Ivars Neretnieks
Affiliation:
Department of Chemical Engineering and Technology, Royal Institute of Technology, S-10044 Stockholm, Sweden
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Abstract

There are several oxygen consuming processes occurring in deep subsurface fractured rocks. The importance of each process depends on the prevailing conditions and what function it has in the overall oxygen scavenging process. In the present work, some of these processes are studied. The aim is to build a frame of maximum rates for each parallel process. Therefore, several rate-limiting factors are not included. Rate expressions were obtained from the literature and compared for different cases to address under which conditions each process is important. Some of the processes may be considered parallel and independent while others occur in series. The main reactions accounted for are abiotic and biotic pyrite and ferrous iron oxidation and the non-oxidative dissolution of matrix ferrous minerals. In addition, transport processes of oxygen and other substrates within the rock matrix are considered. The main conclusions are that initially, when the diffusion resistance in the matrix is nonexistent or small, reaction kinetics are important. However, in a longer time perspective, diffusion processes limit the oxygen scavenging process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 829
Copyright
Copyright © Materials Research Society 2004

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References

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