Modeling Colloid‐Facilitated Contaminant Transport in the Vadose Zone

Flury, Markus; Qiu, Hanxue

doi:10.2136/vzj2007.0066

Cited by 85 publications

(60 citation statements)

References 146 publications

(222 reference statements)

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“…Under certain conditions, colloids could act as carriers to move the adsorbed pollutants to farther locations (Fig. 2) (Š imůnek et al 2006;Flury and Qiu 2008).…”

Section: Facilitated Transport Of Pcsmentioning

confidence: 99%

“…2) (Flury and Qiu 2008). Besides, colloid-facilitated transport has been widely studied for many pollutants, such as heavy metals (Mills et al 1991;Grolimund and Borkovec 2005) and pesticides (Sojitra et al 1995;Sprague et al 2000;Irace-Guigand and Aaron 2003).…”

Section: Facilitated Transport Of Pcsmentioning

confidence: 99%

“…In addition to the natural clays, modified clays were used to enhance adsorption efficiency (Danis et al 1998;Zadaka et al 2007;Polubesova et al 2010;Gil et al 2011). A number of experimental and mathematical models have been developed to describe colloid-facilitated remediation and assess the environmental risks of these pollutants (Flury and Qiu 2008).…”

Section: Introductionmentioning

confidence: 99%

“…After adsorption, some PCs have high affinities with soil matrix which are thought to be immovable may move together with the colloids they bind (Fig. 2) (Š imůnek et al 2006;Flury and Qiu 2008). On the contrary, PCs which have high mobility in water may be retarded under some conditions ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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What happens when pharmaceuticals meet colloids

et al. 2015

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Pharmaceuticals (PCs) have been widely detected in natural environment due to agricultural application of reclaimed water, sludge and animal wastes. Their potential risks to various ecosystems and even to human health have caused great concern; however, little was known about their environmental behaviors. Colloids (such as clays, metal oxides, and particulate organics) are kind of substances that are active and widespread in the environment. When PCs meet colloids, their interaction may influence the fate, transport, and toxicity of PCs. This review summarizes the progress of studies on the role of colloids in mediating the environmental behaviors of PCs. Synthesized results showed that colloids can adsorb PCs mainly through ion exchange, complexation and non-electrostatic interactions. During this process the structure of colloids and the stability of PCs may be changed. The adsorbed PCs may have higher risks to induce antibiotic resistance; besides, their transport may also be altered considering they have great chance to move with colloids. Solution conditions (such as pH, ionic strength, and cations) could influence these interactions between PCs and colloids, as they can change the forms of PCs and alter the primary forces between PCs and colloids in the solution. It could be concluded that PCs in natural soils could bind with colloids and then co-transport during the processes of irrigation, leaching, and erosion. Therefore, colloid-PC interactions need to be understood for risk assessment of PCs and the best management practices of various ecosystems (such as agricultural and wetland systems).

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“…Under certain conditions, colloids could act as carriers to move the adsorbed pollutants to farther locations (Fig. 2) (Š imůnek et al 2006;Flury and Qiu 2008).…”

Section: Facilitated Transport Of Pcsmentioning

confidence: 99%

Section: Facilitated Transport Of Pcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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What happens when pharmaceuticals meet colloids

et al. 2015

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“…Whereas the presence of gaseous phase in the unsaturated subsurface system introduces an additional mechanism for colloid retention. Although several steps has been taken to enhance the understanding of mechanisms responsible for colloid transport and retention through unsaturated porous media, there is a need to put extra effort in this area for better understanding [4,24,42,47,55]. In the unsaturated porous media, the additional mechanisms (compared to saturated system) for colloid transport were reported as: colloid captured at the liquid-gas interface [1, 12, 43, 44, 54, 66-68, 70, 72, 80, 83], colloid captured due to straining [4,7,74,78], the colloid captured at solid-liquid-gas interface [10,17,18,27,51,87,88], and colloid storage in immobile zone [15,25,26,61].…”

Section: Mechanism Of Colloid Attachmentmentioning

confidence: 99%

Geological Disposal of Nuclear Waste: Fate and Transport of Radioactive Materials

Sharma¹

2012

Nuclear Power- Practical Aspects

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Predicting colloid transport through saturated porous media: A critical review

et al. 2015

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Understanding and predicting colloid transport and retention in water‐saturated porous media is important for the protection of human and ecological health. Early applications of colloid transport research before the 1990s included the removal of pathogens in granular drinking water filters. Since then, interest has expanded significantly to include such areas as source zone protection of drinking water systems and injection of nanometals for contaminated site remediation. This review summarizes predictive tools for colloid transport from the pore to field scales. First, we review experimental breakthrough and retention of colloids under favorable and unfavorable colloid/collector interactions (i.e., no significant and significant colloid‐surface repulsion, respectively). Second, we review the continuum‐scale modeling strategies used to describe observed transport behavior. Third, we review the following two components of colloid filtration theory: (i) mechanistic force/torque balance models of pore‐scale colloid trajectories and (ii) approximating correlation equations used to predict colloid retention. The successes and limitations of these approaches for favorable conditions are summarized, as are recent developments to predict colloid retention under the unfavorable conditions particularly relevant to environmental applications. Fourth, we summarize the influences of physical and chemical heterogeneities on colloid transport and avenues for their prediction. Fifth, we review the upscaling of mechanistic model results to rate constants for use in continuum models of colloid behavior at the column and field scales. Overall, this paper clarifies the foundation for existing knowledge of colloid transport and retention, features recent advances in the field, critically assesses where existing approaches are successful and the limits of their application, and highlights outstanding challenges and future research opportunities. These challenges and opportunities include improving mechanistic descriptions, and subsequent correlation equations, for nanoparticle (i.e., Brownian particle) transport through soil, developing mechanistic descriptions of colloid retention in so‐called “unfavorable” conditions via methods such as the “discrete heterogeneity” approach, and employing imaging techniques such as X‐ray tomography to develop realistic expressions for grain topology and mineral distribution that can aid the development of these mechanistic approaches.

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Modeling Colloid‐Facilitated Contaminant Transport in the Vadose Zone

Cited by 85 publications

References 146 publications

What happens when pharmaceuticals meet colloids

What happens when pharmaceuticals meet colloids

Geological Disposal of Nuclear Waste: Fate and Transport of Radioactive Materials

Predicting colloid transport through saturated porous media: A critical review

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