Parameter and model sensitivities for colloid-facilitated radionuclide transport on the field scale

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Cvetkovic, VladimirKTH,Mark- och vattenteknik (author)

Parameter and model sensitivities for colloid-facilitated radionuclide transport on the field scale

Article/chapterEnglish2004

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2004-06-18
American Geophysical Union (AGU),2004
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LIBRIS-ID:oai:DiVA.org:kth-23727
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-23727URI
https://doi.org/10.1029/2004wr003048DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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QC 20100525
We investigate the potential effects of inorganic colloids on radionuclide transport in groundwater using generic sensitivity studies and an example based on the alluvial aquifer near Yucca Mountain, Nevada. Our emphasis is on kinetically controlled sorption of radionuclides on mobile and immobile colloids. Three kinetic sorption models are considered for the sensitivity analysis: bilinear, Langmuir, and linear. Plutonium is assumed to be injected into the Yucca Mountain alluvial aquifer at a constant rate and follows a random stream tube to a monitoring boundary. The linear sorption model provides a reasonable upper bound on colloid-facilitated plutonium transport for the site-specific conditions. In the absence of colloid filtration and retardation, colloids enhance the plutonium discharge by a large factor over the situation without colloids. Exchange of plutonium between solution and reversibly attached colloids makes colloid retardation relatively ineffective at reducing colloid-facilitated transport except when the retardation factor is large. Irreversible removal of colloids (filtration) is more effective than retardation at reducing colloid-facilitated transport. For fixed filtration rate the degree of attenuation depends sensitively and nonmonotonically on the rate of plutonium desorption from colloids. These results emphasize the need for accurate measurements of rates of desorption from colloids as well as in situ studies of filtration of naturally occurring colloids.

Subject headings and genre

colloids
radionuclides
subsurface transport
contaminant transport
porous-media
filtration
plutonium
migration
sorption
kinetics
aquifer
columns
cesium

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Painter, S. (author)
Turner, D. (author)
Pickett, D. (author)
Bertetti, P. (author)
KTHMark- och vattenteknik (creator_code:org_t)

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In:Water resources research: American Geophysical Union (AGU)40:60043-13971944-7973

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