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Title: Analytic studies of colloid transport in fractured porous media

Abstract

We analyze the interactive migration of radioactive colloids and solute in fractured rock. Two possible interactions between radionuclides as colloids and as solute are considered: solute sorption on nonradioactive colloids to form pseudocolloids, and dissolution of radioactive colloids. Previous studies have discussed the formation and transport of colloids in porous media, including removal of colloids by filtration and sedimentation. Colloids can migrate faster than solute because of weaker sorption on stationary solids and because of hydrochromatography of colloid particles in flow channels. However, the migration of colloids and pseudocolloids can be retarded by the interaction of colloids with solute, and the migration of solute in local equilibrium with colloids can be more rapid than if colloids were not present. Here we present a new quantative analysis to predict the interactive migration of colloids and solute in porous and fractured media. 4 figs.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (USA)
OSTI Identifier:
5715074
Report Number(s):
LBL-27200; CONF-901105-118
ON: DE91011891
DOE Contract Number:
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: Fall meeting of the Materials Research Society (MRS), Boston, MA (USA), 24 Nov - 1 Dec 1990
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; POROUS MATERIALS; RADIONUCLIDE MIGRATION; COLLOIDS; FRACTURED RESERVOIRS; RADIOACTIVE WASTE DISPOSAL; TRANSPORT THEORY; DISPERSIONS; ENVIRONMENTAL TRANSPORT; MANAGEMENT; MASS TRANSFER; MATERIALS; WASTE DISPOSAL; WASTE MANAGEMENT; 540230* - Environment, Terrestrial- Radioactive Materials Monitoring & Transport- (1990-)

Citation Formats

Hwang, Y., Chambre, P.L., Lee, W.W.L., and Pigford, T.H. Analytic studies of colloid transport in fractured porous media. United States: N. p., 1989. Web.
Hwang, Y., Chambre, P.L., Lee, W.W.L., & Pigford, T.H. Analytic studies of colloid transport in fractured porous media. United States.
Hwang, Y., Chambre, P.L., Lee, W.W.L., and Pigford, T.H. 1989. "Analytic studies of colloid transport in fractured porous media". United States. doi:. https://www.osti.gov/servlets/purl/5715074.
@article{osti_5715074,
title = {Analytic studies of colloid transport in fractured porous media},
author = {Hwang, Y. and Chambre, P.L. and Lee, W.W.L. and Pigford, T.H.},
abstractNote = {We analyze the interactive migration of radioactive colloids and solute in fractured rock. Two possible interactions between radionuclides as colloids and as solute are considered: solute sorption on nonradioactive colloids to form pseudocolloids, and dissolution of radioactive colloids. Previous studies have discussed the formation and transport of colloids in porous media, including removal of colloids by filtration and sedimentation. Colloids can migrate faster than solute because of weaker sorption on stationary solids and because of hydrochromatography of colloid particles in flow channels. However, the migration of colloids and pseudocolloids can be retarded by the interaction of colloids with solute, and the migration of solute in local equilibrium with colloids can be more rapid than if colloids were not present. Here we present a new quantative analysis to predict the interactive migration of colloids and solute in porous and fractured media. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1989,
month =
}

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  • Recent interests in the transport of toxic chemicals or radionuclides in subsurface formation raise the question of the role of processes involving the interplay of fluid flow, chemical interaction and thermal effects. The present paper reviews three examples of recent studies at Lawrence Berkeley Laboratory in this area, based on numerical modeling with a code called CPT. It is a three-dimensional chemical parcel model with a fully coupled heat and mass transport formulation for porous-fractured media with complex geometries. The three examples are: (1) injection and production of a denser cold fluid into a geothermal reservoir; (2) solute transport inmore » a two-layered aquifer; and (3) solute transport in an aquifer with a horizontal fractured zone. The studies show a number of interesting features which may be of interest to the interpretation of field data. 4 refs., 5 figs., 3 tabs.« less
  • No abstract prepared.
  • In the safety assessment of nuclear waste repositories, sorption of radionuclides on the surfaces of colloids may significantly modify transport behavior where colloid concentration is sufficiently high. In the case of fractured geological media, colloids may be excluded from matrix pores, in which case radionuclides bound to them are not subject to the retarding effects of matrix diffusion and sorption onto matrix pore surfaces. A model is presented describing colloid facilitated transport through fractured media with non-linear sorption. A simple criterion is developed to predict when the presence of colloids will have a significant influence on transport and effects resultingmore » from non-linearity of sorption are described. However, lack of comprehensive sorption data, as well as computational efficiency, mean that the use of a simplified transport model, with linear sorption both on pore surfaces and colloids, is desirable if it can be demonstrated to be conservative. A further criterion is developed to predict where such a model, with linear sorption calculated for the highest concentration encountered along the flow path, would be expected to yield conservative results.« less
  • Colloidal particles present in porous media may be released and transported over significant distances when contacted with water at low ionic strength. An understanding of this process is of environmental interest because suspended colloidal particles in groundwater may enhance the subsurface transport of contaminants that are sorbed on their surfaces. This research focused on the processes of colloid release and transport in natural porous media of interest in contaminant transport, i.e., high permeability materials with low fines contents. Our objective in this study was to examine the mechanisms of colloid release and transport in a natural sand, and two modelmore » systems: latex particles attached on glass beads, and kaolinite particles attached on glass beads. For the appropriate electrolyte conditions, the release of attached colloids from all three porous media was found to be substantial. The total amount of colloids released depended upon the electrolyte composition and concentration. Column effluent data could be described with an advective-dispersive transport equation for colloidal particles with first-order terms for colloid release and deposition rates, by changing the mass of colloids available for release at each electrolyte concentrations.« less