Colloid transport and remobilization in porous media during infiltration and drainage

Zhuang, Jie; Tyner, John S.; Perfect, Edmund

doi:10.1016/j.jhydrol.2009.08.011

Cited by 46 publications

(38 citation statements)

References 51 publications

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“…The saturated hydraulic conductivity, measured prior to exsolution, was 28.3 ± 4.2, 73.8 ± 4.6, and 20.0 ± 1.8 cm/min for the 20/30, 12/20, and mixed sands, respectively, showing reasonable repeatability between packings of the same sand (Table 2). These values are higher than those reported elsewhere (Schroth et al, 1996; Zhuang et al, 2009), also due to the looser packing. The saturated hydraulic conductivity of the mixed sand was lower than that of the 20/30 and 12/20 sands, which was expected given its poorly sorted nature.…”

Section: Resultscontrasting

confidence: 80%

“…The porosity of each sand pack was calculated based on a measured bulk density. The average porosity of each of the 20/30 and 12/20 sands was 0.38 (Table 1), which is at the upper end of other reported values (Hegele and Mumford, 2014;Niemet and Selker, 2001;Schroth et al, 1996;Smits et al, 2010;Zhuang et al, 2009), and the average porosity of the mixed sand was 0.36. Residual water saturations were measured in a separate set of nine experiments conducted in the same flow cell (three per sand type) following the procedure described below but starting with a watersaturated sand pack rather than a sand pack after exsolution and dissolution.…”

Section: Sand Pack Characterizationmentioning

confidence: 57%

See 1 more Smart Citation

Relative Permeability Measurements during the Exsolution and Dissolution of Hydrogen Gas Produced by the Hydrolysis of Sodium Borohydride

Mohammed¹,

Mumford²,

Sleep³

2019

Vadose Zone Journal

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Aqueous relative permeability experiments followed gas exsolution and trapping. Hydrogen gas was produced by the reaction of sodium borohydride and water. Internal drainage, external drainage and imbibition, and dissolution were compared. Trapped gas saturations were higher following internal drainage. Aqueous relative permeability was similar for internal and external displacement. The presence of trapped gas in otherwise water‐saturated porous media has a substantial effect on water flow, which is important to a wide variety of subsurface applications including groundwater remediation, CO2 sequestration, and the release of greenhouse gases associated with oil and gas development. Trapped gases can be created by external drainage and imbibition, where fluids invade from system boundaries, or by internal drainage (exsolution), where gas is produced at nucleation sites within a porous medium. A series of laboratory experiments were conducted in thin flow cells, in which H2 gas was produced by the reaction of sodium borohydride and water to produce a range of trapped gas saturations. Aqueous relative permeability was measured following H2 exsolution and during dissolution and compared with measurements in the presence of air trapped by external drainage and imbibition. The results showed that gas saturations higher than those produced by external displacement remained trapped (immobile) when produced by exsolution but that aqueous relative permeability was similar at the same gas saturations. The results of this study suggest that traditional aqueous relative permeability relationships based on external drainage may be suitable to describe the effects of internal drainage in uniform, loosely packed sands. However, additional investigation across a wider range of porous media and at higher gas saturations is required.

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Section: Resultscontrasting

confidence: 80%

Section: Sand Pack Characterizationmentioning

confidence: 57%

Relative Permeability Measurements during the Exsolution and Dissolution of Hydrogen Gas Produced by the Hydrolysis of Sodium Borohydride

Mohammed¹,

Mumford²,

Sleep³

2019

Vadose Zone Journal

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“…Several drainage and imbibition column experiments have been performed to study the remobilization of colloids and viruses as a result of transient, unsaturated flow. Results showed that the concentration of viruses at the outlet increased when a wetting front arrived (Ryan et al, 1998; Powelson and Mills, 2001; Saiers and Lenhart, 2003; Torkzaban et al, 2006a, 2006b; Shang et al, 2008; Zhuang et al, 2009; Cheng and Saiers, 2009). These studies suggest that temporal changes in saturation, whether drainage or imbibition, promote the remobilization of attached viruses and colloids.…”

mentioning

confidence: 99%

Modeling Virus Transport and Remobilization during Transient Partially Saturated Flow

Zhang

Hassanizadeh

Raoof

et al. 2012

Vadose Zone Journal

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Virus transport in porous media is affected by the water flow regime. During transient, variably saturated flow, fluctuating flow regimes can enhance virus detachment from both solid–water interfaces (SWIs) and air–water interfaces (AWIs). The objective of this study was to simulate the influence of drainage and imbibition events on the remobilization of attached viruses. Three different modeling approaches were examined. In the first approach, all attachment and detachment coefficients were assumed to be constant, but the values of the detachment coefficients were increased drastically for the duration of transient, unsaturated flow. The second and third modeling approaches involved extensions of the model of Cheng and Saiers, who assumed enhanced detachment of viruses to be proportional to the time rate of change in the water content. Their model was extended to include separate terms for virus attachment–detachment on SWIs and AWIs. In our second approach, we assumed kinetic sorption onto the AWI, with the desorption rate being described as a function of temporal changes in the air content. This approach did not explicitly account for the specific air–water interfacial area. Thus, in our third approach we explicitly included the presence and variation of air–water interfaces and assumed AWI attachment–detachment to be an equilibrium sorption process. The available air–water interfacial area was assumed to be a function of fluid saturation. The models were used to simulate a series of saturated–unsaturated virus transport experiments reported in the literature for conditions of both drainage and imbibition. The most promising results were obtained with the third approach, which explicitly accounts for adsorption to air–water interfaces and assumes equilibrium sorption on the available air–water interfacial area.

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“…5a) were contrary to the expectation that greater mobilization would occur at greater FR due to greater hydraulic stress on the particles (Du et al 2013;Sasidharan et al 2014;Yu et al 2013;Zhuang et al 2009). In our experiments, FR increase slightly restrained mobilization and transport of the tailing particles.…”

Section: Effect Of Flow Rate Perturbations On Tailing Particle Releasementioning

confidence: 73%

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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Colloid transport and remobilization in porous media during infiltration and drainage

Cited by 46 publications

References 51 publications

Relative Permeability Measurements during the Exsolution and Dissolution of Hydrogen Gas Produced by the Hydrolysis of Sodium Borohydride

Relative Permeability Measurements during the Exsolution and Dissolution of Hydrogen Gas Produced by the Hydrolysis of Sodium Borohydride

Modeling Virus Transport and Remobilization during Transient Partially Saturated Flow

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

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