Review on subsurface colloids and colloid-associated contaminant transport in saturated porous media

Sen, Tushar Kanti; Khilar, Kartic C.

doi:10.1016/j.cis.2005.09.001

Cited by 379 publications

(82 citation statements)

References 188 publications

(247 reference statements)

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“…Owing to the tracer test series number carried out in this study, the material mass introduced within the column was measured in order to ensure the reproducibility of the experiments. During the tracer experiments, the column was installed in horizontal position in order to simulate an aquifer where the particle transport is mainly horizontal (Kanti and Khilar 2006) and to avoid an unequal packing down along the column, which make the porous medium heterogeneous. This phenomenon does not affect the columns of small dimensions, but can occur in our case because of the high flow rates tested and the important material mass packed within the column.…”

Section: Methodsmentioning

confidence: 99%

“…Particle-facilitated contaminants transport (Grolimund et al 1996;Kanti and Khilar 2006), accidents due to internal erosion in the hydraulic structures (Bonelli et al 2006) and permeability decreases (clogging due to particle deposition) of the oil wells (Moghadasi et al 2004a,b), drinking water supply (Detay 1993) or artificial recharge of the aquifers (Bouwer 2002;Vigneswaran and Suazo Ronillo 1987;Vigneswaran et al 1985) aroused a growing interest. Emerging pollution problems and water quality deterioration require an optimization of physical knowledge and a modelling of the phenomena of retention and transport of the pollutants in soil.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Internal Structure and Medium Length on Transport and Deposition of Suspended Particles: A Laboratory Study

et al. 2008

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A laboratory study was undertaken on the transport and the deposition of suspended particles (silt of modal diametre 6 µm) in three columns of different length, filled with glass beads or gravel. Tracer tests were carried out at various flow velocities by short pulses of a mixture of suspended particles/dissolved tracer. The breakthrough curves were competently described with the analytical solution of a convection dispersion equation with a first-order deposition rate and the hydro-dispersive parameters were deduced. For the same experimental conditions, the results showed a difference in the behaviour of the suspended particles transport and deposition rates within the two porous media tested. The internal structure of both media governs the particle-grain collision frequency as well as the particles trapping. The scale effect was highlighted and affects the dispersivity, the size exclusion effect, the recovery rates and the deposition rates. Longitudinal dispersion increases with mean pore velocity and is described with a nonlinear relationship. The dispersivity increases with the column length. The size exclusion effect is more important in the short column. The recovery rate increases with flow velocity and decreases while increasing column length. The deposition rates increases until a critical flow velocity then decreases. This critical velocity is also sensitive to the scale effect, and increases with the column length.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Internal Structure and Medium Length on Transport and Deposition of Suspended Particles: A Laboratory Study

et al. 2008

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“…Previous studies have indicated that the transport of pollutants (e.g., heavy metals, radioactive pollutants, and organic matter) through subsurface environments is facilitated by colloids (Denaix et al, 2001;Hammes et al, 2013;Honeyman, 1999;Kersting et al, 1999;Pedrot et al, 2008;Roy and Dzombak, 1997;Wang et al, 2011a;Yin et al, 2010;Zhang et al, 2005). The generally accepted mechanism of colloid-facilitated pollutant transport was that the colloid acts as a carrier to adsorb the pollutant and thus promote pollutant transport (Kanti Sen and Khilar, 2006).…”

Section: Introductionmentioning

confidence: 99%

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Guo

Lei

et al. 2016

Environmental Pollution

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a b s t r a c tTransport of environmental pollutants through porous media is influenced by colloids. Co-transport of As(V) and soil colloids at different pH were systematically investigated by monitoring breakthrough curves (BTCs) in saturated sand columns. A solute transport model was applied to characterize transport and retention sites of As(V) in saturated sand in the presence of soil colloids. A colloid transport model and the DLVO theory were used to reveal the mechanism and hypothesis of soil colloid-promoted As(V) transport in the columns. Results showed that rapid transport of soil colloids, regulated by pH and ionic strength, promoted As(V) transport by blocking As(V) adsorption onto sand, although soil colloids had low adsorption for As(V). The promoted transport was more significant at higher concentrations of soil colloids (between 25 mg L À1 and 150 mg L À1) due to greater blocking effect on As(V) adsorption onto the sand surfaces. The blocking effect of colloids was explained by the decreases in both instantaneous (equilibrium) As adsorption and first-order kinetic As adsorption on the sand surface sites. The discovery of this blocking effect improves our understanding of colloid-promoted As transport in saturated porous media, which provides new insights into role of colloids, especially colloids with low As adsorption capacity, in As transport and mobilization in soil-groundwater systems.

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“…Colloidal particle mobilization and transport in natural porous media often occur as a result of water physicochemical perturbations (Zhu et al 2014;Zhuang et al 2007), therein, changes in water ionic strength (IS) and flow rate (FR) are the major factors inducing particle mobilization and transport (Kanti Sen and Khilar 2006;Knappenberger et al 2014;Pham et al 2014;Slowey et al 2005). For mine tailings the investigation on colloidal particle mobilization and transport under transient IS and FR is particularly relevant, because the changes in pore-water IS and FR can be frequently triggered by rainfall or snowmelt water that move through the tailing piles, and then lead to tailing particle release (Lower et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Mobilization and transport of metal-rich colloidal particles from mine tailings into soil under transient chemical and physical conditions

et al. 2016

Environ Sci Pollut Res

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Exposed mine tailing wastes with considerable heavy metals can release hazardous colloidal particles into soil under transient chemical and physical conditions. Two-layered packed columns with tailings above and soils below were established to investigate mobilization and transport of colloidal particles from metal-rich mine tailings into soil under transient infiltration ionic strength (IS: 100, 20, 2 mM) and flow rate (FR: 20.7, 41, and 62.3 mm h(-1)), with Cu and Pb as representatives of the heavy metals. Results show that the tailing particles within the colloidal size (below 2 μm) were released from the columns. A step-decrease in infiltration IS and FR enhanced, whereas a step-increase in the IS and FR restrained the release of tailing particles from the column. The effects of step-changing FR were unexpected due to the small size of the released tailing particles (220-342 nm, being not sensitive to hydrodynamic shear force), the diffusion-controlled particle release process and the relatively compact pore structure. The tailing particles present in the solution with tested IS were found negatively charged and more stable than soil particles, which provides favorable conditions for tailing particles to be transported over a long distance in the soil. The mobilization and transport of Cu and Pb from the tailings into soil were mediated by the tailing particles. Therefore, the inherent toxic tailing particles could be considerably introduced into soil under certain conditions (IS reduction or FR decrease), which may result in serious environmental pollution.

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Review on subsurface colloids and colloid-associated contaminant transport in saturated porous media

Cited by 379 publications

References 188 publications

Influence of Internal Structure and Medium Length on Transport and Deposition of Suspended Particles: A Laboratory Study

Influence of Internal Structure and Medium Length on Transport and Deposition of Suspended Particles: A Laboratory Study

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Mobilization and transport of metal-rich colloidal particles from mine tailings into soil under transient chemical and physical conditions

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