Particle transport within water-saturated porous media: Effect of pore size on retention kinetics and size selection

Ikni, Tahar; Benamar, Ahmed; Kadri, M.; Ahfir, Nasre-Dine; Wang, Huaqing

doi:10.1016/j.crte.2013.09.001

Cited by 24 publications

(8 citation statements)

References 33 publications

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“…Herzig, Leclerc, and Goff () proposed the first macroscopic model to describe the temporal evolution of the concentration of retained particles in the pore water by defining a single attachment term. More refined analytical models were subsequently proposed to improve the description of the mass transfer rate between the mobile and retained particles (Gitis, Rubinstein, Livshits, & Ziskind, ; Ikni, Benamar, Kadri, Ahfir, & Wang , ; Moghadasi et al, ), which increased the model sophistication for revealing the clogging process. Because the parameters in the above models are difficult to obtain, more effort should be taken to link the laboratory and field studies of GAR.…”

Section: Introductionmentioning

confidence: 99%

Clogging process by suspended solids during groundwater artificial recharge: Evidence from lab simulations and numerical modelling

Chu

Yang

Lü

et al. 2019

Hydrological Processes

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Permeability reduction of infiltration media due to suspended solid (SS) clogging is the bane of groundwater artificial recharge. To overcome the clogging problem and advance the understanding of the process-based spatial-temporal evolution of SS clogging, a 1D laboratory column simulation was carried out, followed by numerical modelling of the experimental data in this study. It was found that clogging caused a reduction in the hydraulic conductivity (K) in the upper layer at the beginning and extended deeper to approximately 50 cm, and no reduction in K was detected below 52 cm throughout the experimental period of 129 hr. The most clogged layer spanned from the surface to a depth of 11 cm, and the middle 11-52 cm was characterized by a slight decrease in K. The clogging rates of the different layers decreased with the depth, which was based on data analysis, with the largest value of 0.038 hr −1 in the upper 1 cm. The overall K began to decrease from the surface layer and was increasingly affected by clogging with time. A mathematical model was established to simulate the SS clogging process evolution based on considerations of the attachments and detachments of particles. Then the model was applied to perform several scenario analyses after calibration and validation using the data obtained in the experiment. The simulation results indicated that the SS concentration was much more sensitive than the groundwater depth below the land surface, and 10 days of constant recharge is recommended as the disposal cycle of the clogged layer under the given conditions. K E Y W O R D S groundwater artificial recharge, hydraulic conductivity, laboratory experiments, numerical modelling, permeability reduction, saturated porous media, suspended solid clogging, vertical seepage

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Section: Introductionmentioning

confidence: 99%

Clogging process by suspended solids during groundwater artificial recharge: Evidence from lab simulations and numerical modelling

Chu

Yang

Lü

et al. 2019

Hydrological Processes

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“…Colloidal tracer longitudinal dispersivity is higher than observed for uranine, and increases even more for particles with a diameter of 848 nm. Although it has been reported also previously that dispersivity increases with increasing particle size, it may also be a result of the particle size distribution, and further research is needed …”

Section: Resultsmentioning

confidence: 83%

Silica-Encapsulated DNA-Based Tracers for Aquifer Characterization

Mikutis

Deuber

Schmid

et al. 2018

Environ. Sci. Technol.

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Environmental tracing is a direct way to characterize aquifers, evaluate the solute transfer parameter in underground reservoirs, and track contamination. By performing multitracer tests, and translating the tracer breakthrough times into tomographic maps, key parameters such as a reservoir's effective porosity and permeability field may be obtained. DNA, with its modular design, allows the generation of a virtually unlimited number of distinguishable tracers. To overcome the insufficient DNA stability due to microbial activity, heat, and chemical stress, we present a method to encapsulated DNA into silica with control over the particle size. The reliability of DNA quantification is improved by the sample preservation with NaN 3 and particle redispersion strategies. In both sand column and unconsolidated aquifer experiments, DNA-based particle tracers exhibited slightly earlier and sharper breakthrough than the traditional solute tracer uranine. The reason behind this observation is the size exclusion effect, whereby larger tracer particles are excluded from small pores, and are therefore transported with higher average velocity, which is pore size-dependent. Identical surface properties, and thus flow behavior, makes the new material an attractive tracer to characterize sandy groundwater reservoirs or to track multiple sources of contaminants with high spatial resolution.

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“…The rate of fluid injection was set to 2.676 g/min, and the Darcy velocity was 8.18 cm/hr to mimic the rate of coastal groundwater interaction (Boluda‐Botella et al, ). The colloid‐scale (10 nm to 10 μm) kinetics in this study were dominated by the interaction energy and gravity (Ikni et al, ; Sen & Khilar, ). To avoid colloid precipitation and maximize the collection of colloid fractions that were released from the secondary energy minimum, the flow direction was designed from top to bottom, and the column was turned upside down between each shift in the injection stage.…”

Section: Experimental Methodsmentioning

confidence: 72%

“…Bennacer, Ahfir, Bouanani, Alem, and Wang () found that the grain size of migrational particles increases in transient flow, whereas in steady flow, the migration ability of a dissolved tracer is always stronger than that of the suspended particles is. The dispersion of suspended particles can also be higher than that of a dissolved tracer can under the influences of inertia and gravity for colloidal particles (Ikni, Benamar, Kadri, Ahfir, & Wang, ). The combined effects of ionic strength, grain size, and colloid particle size affect colloid stability and the associated transport behaviour.…”

Section: Introductionmentioning

confidence: 99%

Modelling of colloidal particle and heavy metal transfer behaviours during seawater intrusion and refreshing processes

Tan

Dai

Zhou

et al. 2017

Hydrological Processes

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The proper management of coastal aquifers commonly requires an understanding of regional mass flow and complete seawater-freshwater circulation. In this study, time series observations of seawater intrusion and refreshing were conducted using a column experiment based on natural flow conditions in coastal groundwater and a sampled medium from a coastal sandy aquifer without chemical treatment. Ranges of hydrodynamic and hydrochemical variables were tested and

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Particle transport within water-saturated porous media: Effect of pore size on retention kinetics and size selection

Cited by 24 publications

References 33 publications

Clogging process by suspended solids during groundwater artificial recharge: Evidence from lab simulations and numerical modelling

Clogging process by suspended solids during groundwater artificial recharge: Evidence from lab simulations and numerical modelling

Silica-Encapsulated DNA-Based Tracers for Aquifer Characterization

Modelling of colloidal particle and heavy metal transfer behaviours during seawater intrusion and refreshing processes

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