Analysis of latex, gold and smectite colloid transport and retention in artificial fractures in crystalline rock

Albarran, Nairoby; Missana, Tiziana; Alonso, Úrsula; Garcı́a-Gutiérrez, Miguel; López, Trinidad

doi:10.1016/j.colsurfa.2013.02.002

Cited by 20 publications

(22 citation statements)

References 49 publications

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“…115, 283, 285, 297-300]. Second, at pore scale size exclusion has been attributed to migration of particles on flow paths which are close to the center of the pore channels where the velocity is theoretically 1.5 times larger than the mean pore water velocity-similar to the phenomena in solute transport context called "charge" or "anion exclusion", but with different underlying forces [58,116,139,151,153,283].…”

Section: Mechanismmentioning

confidence: 99%

“…Mechanistic models focus on the individual particles by considering the forces, torques, and energy of particle and interacting media [30,36,[47][48][49][50][51][52][53][54]. These models become more difficult to apply when several phenomena occur simultaneously during transport of NP in porous media [21,31,33,48,[55][56][57][58][59][60][61][62][63][64]. Moreover, the intrinsic complexities and heterogeneities prevalent in real environmental conditions, such as surface roughness [65][66][67][68], natural organic matter (NOM) [32,47,69], iron oxyhydroxide coating [70][71][72], silylation [73], extracellular polymeric substance, and biofilm [74][75][76] make it unfeasible to use models such as classical colloid filtration theory (CFT) [65][66][67][68], Derjaguin-Landau-Verwey-Overbeek (DLVO) theory [47,77], and Maxwell model…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

Babakhani¹,

Bridge

Doong³

et al. 2017

Advances in Colloid and Interface Science

128

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Environmental applications of nanoparticles (NP) increasingly result in widespread NP distribution within porous media where they are subject to various concurrent transport mechanisms including irreversible deposition, attachment/detachment (equilibrium or kinetic), agglomeration, physical straining, site-blocking, ripening, and size exclusion. Fundamental research in NP transport is typically conducted at small scale, and theoretical mechanistic modeling of particle transport in porous media faces challenges when considering the simultaneous effects of transport mechanisms. Continuum modeling approaches, in contrast, are scalable across various scales ranging from column experiments to aquifer. They have also been able to successfully describe the simultaneous occurrence of various transport mechanisms of NP in porous media such as blocking/straining or agglomeration/deposition/detachment. However, the diversity of model equations developed by different authors and the lack of effective approaches for their validation present obstacles to the successful robust application of these models for describing or predicting NP transport phenomena. This review aims to describe consistently all the important NP transport mechanisms along with their representative mathematical continuum models as found in the current scientific literature. Detailed characterizations of each transport phenomenon in regards to their manifestation in the column experiment outcomes, i.e., breakthrough curve (BTC) and residual concentration profile (RCP), are presented to facilitate future interpretations of BTCs and RCPs. The review highlights two NP transport mechanisms, agglomeration and size exclusion, which are potentially of great importance in controlling the fate and transport of NP in the subsurface media yet have been widely neglected in many existing modeling studies. A critical limitation of the continuum modeling approach is the number of parameters used upon application to larger scales and when a series of transport mechanisms are involved. We investigate the use of simplifying assumptions, such as the equilibrium assumption, in modeling the attachment/detachment mechanisms within a continuum modelling framework. While acknowledging criticisms about the use of this assumption for NP deposition on a mechanistic (process) basis, we found that its use as a description of dynamic deposition behavior in a continuum model yields broadly similar results to those arising from a kinetic model. Furthermore, we show that in two dimensional (2-D) continuum models the modeling efficiency based on the Akaike information criterion (AIC) is enhanced for equilibrium vs kinetic with no significant reduction in model performance. This is because fewer parameters are needed for the equilibrium model compared to the kinetic model. Two major transport regimes are identified in the transport of NP within porous media. The first regime is characterized by higher particle-surface attachment affinity than particle-particle attachment affinity, and operat...

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Section: Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

Babakhani¹,

Bridge

Doong³

et al. 2017

Advances in Colloid and Interface Science

128

View full text Add to dashboard Cite

show abstract

“…The impact of matrix diffusion on solute transport through fractures has been noted by several studies [115]- [119]. The effect of matrix diffusion is also evident in the delayed breakthrough of conservative tracers compared to colloids in transport tests [31], [33], [120], [121].…”

Section: Solute Transport Through Fractured Rockmentioning

confidence: 78%

Favorable and unfavorable attachment of colloids in a discrete sandstone fracture

Spanik

Rrokaj

Mondal

et al. 2021

Journal of Contaminant Hydrology

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“…Previous dynamic colloid-transport studies showed that the relevance of particle diameter (Baik et al, 2007;Vilks & Miller, 2009;Albarran et al, 2013;Huber et al, 2014), therefore, and the potential risk of bentonite colloids, disaggregated upon quick dilution, being contributors to radionuclide migration within repository host rock, would be limited if particles were large or unstable. Disaggregation of bentonite colloids is promoted effectively by decreasing ionic strength, but the process is not fully reversible and initial stable hydrodynamic diameters are not recovered, even at lower ionic strengths and in the absence of divalent cations.…”

Section: S U M M a Rymentioning

confidence: 99%

“…Colloidal particles are of concern because they have been identified as responsible for the migration of radionuclides over long distances (∼3 km) in some sites (Penrose et al, 1990;Kersting et al, 1999;Novikov et al, 2006). In addition, colloid size and stability affect contaminant transport (Baik et al, 2007;Vilks & Miller, 2009;Albarran et al, 2013;Huber et al, 2014) and retention (Alonso et al, 2007).…”

mentioning

confidence: 99%

Size distribution of FEBEX bentonite colloids upon fast disaggregation in low-ionic strength water

et al. 2016

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Bentonite colloids generated from the backfill barrier in nuclear waste repositories may act as radionuclide carriers, if they are stable and mobile. Repository scenarios with highly saline groundwater inhibit colloid stability as particles tend to aggregate but, in the time frame of repositories, groundwater conditions may evolve, promoting particle disaggregation and stabilization. The disaggregation of FEBEX bentonite colloids by fast dilution to lower ionic strength was analysed in this study. Time-resolved dynamic light-scattering experiments were carried out to evaluate the kinetics of bentonite colloid aggregation and disaggregation processes in Na+ and Na+-Ca2+ mixed electrolytes of low ionic strength. Attachment and detachment efficiencies were determined.Aggregation is promoted by increasing ionic strength, being more efficient in the presence of divalent cations. Once bentonite colloids are aggregated, a decrease in ionic strength facilitates disaggregation, but the process is not fully reversible as the initial size of the stable bentonite colloids at low ionic strength is not fully recovered. Particle-size distribution and concentration in suspension were analysed on disaggregated samples by single particle-counting measurements. Small colloids were measured in the disaggregated samples but their population was smaller than in the initial stable sample, especially in the presence of Ca2+.

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Analysis of latex, gold and smectite colloid transport and retention in artificial fractures in crystalline rock

Cited by 20 publications

References 49 publications

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

Favorable and unfavorable attachment of colloids in a discrete sandstone fracture

Size distribution of FEBEX bentonite colloids upon fast disaggregation in low-ionic strength water

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