Modelling biochemical processes in rocks: Analysis and exploratory simulations of competition of different processes important for ferrous mineral oxidation and oxygen depletion
2004 (English)In: SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVII / [ed] Oversby, VM; Werme, LO, 2004, Vol. 807, 829-834 p.Conference paper (Refereed)
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 nonoxidative 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.
Place, publisher, year, edition, pages
2004. Vol. 807, 829-834 p.
, MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS, ISSN 0272-9172 ; 807
IdentifiersURN: urn:nbn:se:kth:diva-43832ISI: 000225038400134ScopusID: 2-s2.0-12844278030ISBN: 1-55899-752-0OAI: oai:DiVA.org:kth-43832DiVA: diva2:448795
27th Symposium on Scientific Basis for Nuclear Waste Management Location: Kalmar, SWEDEN Date: JUN 15-19, 2003
QC 201110182011-10-182011-10-182011-10-31Bibliographically approved