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Evaluation of Colloid Transport Experiments in a Quarried Block
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Vattenvårdsteknik.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Vattenvårdsteknik.
2009 (engelsk)Inngår i: SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXXII / [ed] Hyatt NC; Pickett DA; Rebak RB, 2009, Vol. 1124, s. 519-524Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Colloid tracer experiments were performed in a single, heterogeneous fracture contained in a quarried block (QB) under the configuration of dipole tracer tests. The experiments were first performed using bentonite and 100 nm latex colloids, as well as conservative tracer iodide and bromide, under conditions of different flow rates in order to identify the flow rates that favour colloid transport. The tracer experiments were later expanded to include experiments with different colloid sizes and longer transport distances. The aims of the present study are to identify the processes that affect colloid transport in the QB fracture and to estimate the retention parameters for the different sized colloids. We model the measured breakthrough curves (BTCs) using an advection-retention approach. The key feature of the advection-retention model is that advective transport and retention processes are related in a dynamic manner through the flow equation. Two Lagrangian random variables, tau and beta, that depend solely on flow conditions, control the retention processes. Here tau is the nonreactive travel time and beta is related to tau but also depends on the local aperture value. We assume the water residence time distribution g(tau) to be inverse-gaussian. The first two moments of g(tau) were obtained by calibrating the measured BTCs of conservative tracers. We then model the colloid BTCs using g(tau) and take into account the retention processes. The modelling results indicate that dominating retention processes include first-order linear kinetic attachment/detachment on the fracture surface, and mass loss (removal) by filtration/sedimentation. Diffusion into the rock matrix is of a much lesser importance.

sted, utgiver, år, opplag, sider
2009. Vol. 1124, s. 519-524
Serie
Materials Research Society Symposium Proceedings, ISSN 0272-9172 ; 1124
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-30414DOI: 10.1557/PROC-1124-Q11-03ISI: 000270898900068Scopus ID: 2-s2.0-70449337499ISBN: 978-1-60511-096-7 (tryckt)OAI: oai:DiVA.org:kth-30414DiVA, id: diva2:400879
Konferanse
32nd Symposium on Scientific Basis for Nuclear Waste Management held at the 2008 MRS Fall Meeting, Boston, MA, DEC 01-05, 2008
Merknad
QC 20110228Tilgjengelig fra: 2011-02-28 Laget: 2011-02-24 Sist oppdatert: 2011-02-28bibliografisk kontrollert

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