Results 221 to 230 of about 2,788,214 (253)

Numerical simulation of colloid-facilitated impurity transport in porous media

The European Physical Journal B, 2020
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Kondratenko, Peter S., Matveev, Leonid V., Vasiliev, Alexander D.   +2 more
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Dimensional Analysis of Colloid-Facilitated Ground-Water Contaminant Transport

Journal of Hydrologic Engineering, 1996
Mobile subsurface colloids can carry ground-water contaminants sorbed onto their surfaces to far greater distances than predicted using a conventional advective/dispersive transport equation with normal retardation values. In this study, we present a dimensional analysis of colloid-facilitated ground-water contaminant transport. The significance of the
M. Yavuz Corapcioglu, Shiyan Jiang
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Colloid Facilitated Transport in Natural Porous Media: Fundamental Phenomena and Modelling

2007
Reactive transport phenomena, in particular, the transport of contaminants, are of fundamental interest in environmental sciences. The presence of hazardous chemicals in the subsurface environment has become an important driving force to develop reactive transport models capable to predict their fate (Dagan 1989; Jury and Roth 1990; Sardin et al. 1991;
Grolimund, Daniel, Barmettler, Kurt, Borkovec, Michal   +2 more
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Atrazine Adsorption and Colloid‐Facilitated Transport through the Unsaturated Zone

Journal of Environmental Quality, 2000
AbstractOne explanation for unexpectedly widespread ground water contamination from atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐s‐triazine) may be the occurrence of colloid‐facilitated transport, whereby the dissolved herbicide becomes adsorbed to mobile colloids that migrate through preferential flow‐paths in the soil zone and into the ground ...
Lori A. Sprague, Janet S. Herman, George M. Hornberger, Aaron L. Mills   +3 more
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Models of Sorption Type for Colloid-Facilitated Transport in Aquifers

2011
This chapter considers sorption-based numerical models simulating 1D migration of chemical species in the presence of mobile reactive colloids. One of the model extensions includes a module for simulating the migration of a colloid mixture characterized by heterogeneous distributions of particle size and sorption properties.
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Estuarine Colloids: Sorption Capacity, Colloid Facilitated Transport and Bioavailibility

1994
Abstract : LONG-TERM GOALS. To gain a better understanding of the role of colloidal organic macromolecules and inorganic colloidal microparticles in the cycling, speciation and bioavailability of trace elements in coastal waters. SCIENTIFIC OBJECTIVES. 1. Critically evaluate ultra-filtration methodology for the collection of colloidal matter from fresh,
Gary A. Gill, Peter Santschi
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Colloid-Facilitated Transport of Cesium in Vadose-Zone Sediments: The Importance of Flow Transients

Environmental Science & Technology, 2010
Colloid-sized particles are commonly detected in vadose-zone pore waters and are capable of binding chemicals with sorptive affinities for geologic materials. Published research demonstrates that colloids are capable of facilitating the transport of sorptive contaminants under conditions of steady pore water flow, when volumetric moisture content and ...
Tao, Cheng, James E, Saiers
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Implications of Cation Exchange on Clay Release and Colloid‐Facilitated Transport in Porous Media

Journal of Environmental Quality, 2010
Column experiments were conducted to study chemical factors that influence the release of clay (kaolinite and quartz minerals) from saturated Ottawa sand of different sizes (710, 360, and 240 μm). A relatively minor enhancement of clay release occurred when the pH was increased (5.8 to 10) or the ionic strength (IS) was decreased to deionized (DI ...
Scott A, Bradford, Hyunjung, Kim
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Theoretical Analysis of Colloid-facilitated Transport of Radionuclides by Groundwater

2011
Mechanisms of colloid-facilitated transport of radionuclides by groundwater are considered for three types of radioactive colloids: intrinsic colloids, primary colloids and pseudocolloids. Effect of elevated velocity of colloid facilitated migration is analyzed.
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A Thermodynamics-Based Conceptual Model for Colloid-Facilitated Solute Transport

2011
As mentioned above (Sect. 19.1.2), changes in the physicochemical conditions in the system over space and time, which take place in unsteady-state migration flows, reduce the potential of the above-considered sorption isotherm-based models with time-invariant coefficients, in particular, models describing colloid-facilitated transport.
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