Surface chemistry investigation of colloid transport in packed beds. Final report, August 1, 1989--July 31, 1996 Page: 1 of 10
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Project Title: Surface Chemistry Investigation of Colloid Transport in Packed
Principal Investigator: Terese M. Olson, Associate Professor
Period: August 1, 1989 - July 31, 1996
Address/Institution: Department of Civil & Environmental Engineering, University
of California, Irvine, California 92697-2175
DOE Grant No.: DE-FG03-89ER60849
Project Scope and Objectives
The importance of colloids as co-transport agents for pollutants in subsurface systems
hinges on the extent to which electrostatic or other sources of repulsive colloid-collector
interactions inhibit their filtration. When electrostatic interactions are favorable, for
example when the colloid and groundwater media have opposite charge, colloids may be
expected to travel only a few centimeters in saturated porous media. Repulsive
electrostatic interactions between colloids and aquifer media with the same charge sign
are postulated to significantly mobilize particles [1,2]. As it happens, however, theories
describing particle filtration from first principles, i.e., DLVO (Derjagin and Landau,
Verwey and Overbeek) theory, dramatically underestimate filtration rates when colloid-
collector interactions are electrostatically repulsive [3,4].
One of the primary objectives of the project was to experimentally investigate
potential reasons for the historical lack of agreement between particle filtration models
based on DLVO theory and observed particle deposition rates. An important hypothesis
of the study was to test the validity of the assumption of surface homogeneity, as required
by these models. The approach was to focus on collector surfaces that were commonly
used as model systems, e.g., glass beads and quartz sand. Laboratory-scale column
filtration experiments were conducted with colloidal polystyrene latex spheres. Collector
surface preparation and cleaning approaches were examined, as well as the effects of
solution chemistry. The results of these investigations are described under "Task 1"
Non-electrostatic repulsive forces are well known to stabilize particle suspensions in
many industrial and commercial applications, particularly those that arise from polymer
coatings . The role of natural polymers in stabilizing colloids with respect to filtration
in groundwater systems, however, is not well understood.
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Olson, T.M. Surface chemistry investigation of colloid transport in packed beds. Final report, August 1, 1989--July 31, 1996, report, December 31, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc710782/m1/1/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.