Influence of mineral colloids and humic substances on uranium(VI) transport in water-saturated geologic porous media

Wang, Qing; Cheng, Tao; Wu, Yang

doi:10.1016/j.jconhyd.2014.10.007

Cited by 57 publications

(19 citation statements)

References 80 publications

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“…2a). The height of those plateaus was independent of soil colloid concentrations, which was different from other observations, showing the increase in plateau height of facilitated hydroxyatrazine transport with increasing concentration of clay colloid (Wang et al, 2014). However, the As(V) breakthrough time decreased with the increase in concentrations of soil colloids.…”

contrasting

confidence: 93%

“…Unfortunately, little attention has been paid to this issue. Since most of studies used colloids with a high adsorption capacity for pollutants during experiments (Grolimund and Borkovec, 2005;Grolimund et al, 1996;Saiers, 2002;Wang et al, 2011aWang et al, , 2014, colloids mainly acted as carriers to facilitate the pollutant transport. Among them, ferruginous colloids (e.g., ferrihydrite colloids, Fe(III)-hydroxysulfates colloids, and Fe-NOM colloids) with a high adsorption capacity have been utilized to investigate facilitated As transport (Fritzsche et al, 2011;Guo et al, 2011;Neubauer et al, 2013;Slowey et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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confidence: 93%

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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“…Furthermore, mobile colloids act as a third phase, apart from the immobile solid constituents and the mobile aqueous phase, largely controlling the transport of pollutants in many environmental compartments (McCarthy and Zachara 1989;de Jonge et al 2004;Baumann et al 2006;Lead and Wilkinson 2006). Specifically, the mobility of colloidal U is favored by Fe, Al, minerals (e.g., clay), carbonbased particles (organic and inorganic) and macromolecules, pH-dependent sorption/desorption interactions, and the formation of alkali-and alkaline-earth uranates (Claveranne-Lamolère et al 2009;Claveranne-Lamolère et al 2011;Dreissig et al 2011;Bots et al 2014;Wang et al 2014;Chen et al 2018;Ge et al 2018;Harguindeguy et al 2018;Maria et al 2020). For example, Yang et al (2013) observed that the desorption of U from colloidal suspensions is influenced by interactions between metal/silicon oxides and humic acids, depending on their composition.…”

Section: +mentioning

confidence: 99%

Distribution, behavior, and erosion of uranium in vineyard soils

Campos

Blanché

Jungkunst

et al. 2021

Environ Sci Pollut Res

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Phosphate fertilization contributes to an input of uranium (U) in agricultural soils. Although its accumulation and fate in agricultural soils have been previously studied, its colloidal transport and accumulation along slopes through erosion have been studied to a lesser extent in viticulture soils. To bridge this gap, the contents and potential mobility of U were investigated in vineyard model soils in the Rhineland-Palatinate region, Germany. In addition to elevated U contents, U was expected to associate with colloids and subject to erosion, thus accumulating on slope foots and in soils with fine structure, and reflecting a greater variability. Moreover, another expectation was the favorable erosion/mobility of U in areas with greater carbonate content. This was tested in three regional locations, at different slope positions and through soil horizon depths, with a total of 57 soil samples. The results show that U concentrations (0.48–1.26 ppm) were slightly higher than proximal non-agricultural soils (0.50 ppm), quite homogenous along slope positions, and slightly higher in topsoils. Assuming a homogeneous fertilization, the vertical translocation of U in soil was most probably higher than along the slope by erosion. In addition, carbonate content and soil texture correlated with U concentrations, whereas other parameters such as organic carbon and iron contents did not. The central role of carbonate and soil texture for the prediction of U content was confirmed using decision trees and elastic net, although their limited prediction power suggests that a larger sample size with a larger range of U content is required to improve the accuracy. Overall, we did not observe neither U nor colloids accumulating on slope foots, thus suggesting that soils are aggregate-stable. Lastly, we suggested considering further soil parameters (e.g., Ca2+, phosphorus, alkali metals) in future works to improve our modelling approach. Overall, our results suggest U is fortunately immobile in the studied locations.

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“…With advanced mining equipment and technologies, longwall mining of coal seams [1][2][3][4] and in situ leaching of uranium [5][6][7] have been widely accepted. However, as a stack resource, the efficiency and safety of coal and uranium mining are important for energy demand, economic development, and ecological balance.…”

Section: Introductionmentioning

confidence: 99%

Coupled Multifield Response to Coordinate Mining of Coal and Uranium: A Case Study

Zhang

Yuan

Wei

et al. 2020

Water

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The coordinate mining of stack resources in the Ordos Basin, which involves the coupling effects of stress fracture, seepage, and reactive solute transport, plays an important role in resource exploration and environment protection. A coupled multiphysical–chemical model, involving a modified non-Darcy flow model, a leaching solution reaction, and a reactive solute transport model, was developed in this study. The Fast Lagrangian Analysis of Continua -Computational Fluid Dynamics (FLAC3D-CFD) simulator coupled with the developed models was used to investigate the evolution and morphology of mining-induced multifield coupling for the scenarios of concurrent mining and asynchronous mining of coal and uranium. As mining advanced to 160 m, the maximum principle stress characterized by a stress shell was observed. As mining progressed to 280 m, a rupture occurred, and a new stress shell was generated as a rear skewback was formed by the concentrated stress of the stope. An “arch-shaped” fracture field combined with a “saddle-shaped” seepage field was identified in the destressed zone of the stress shell. In the coordinated mining of uranium prior to coal, “funnel-shaped” and “asymmetric saddle-shaped” morphologies of the leaching solution were found during coal mining for ventilation in the stope and mining face. By contrast, “saddle-shaped”, “inclined funnel-shaped”, and “horizontal” morphologies of the leaching solution were observed for a short period for ventilation of the stope and mining face for coal mining prior to uranium mining, uranium mining prior to coal mining, and synchronized coal and uranium mining. A dynamic stress response was obtained in the coal seam, followed by the conglomerate aquifer and the uranium deposits. The diffusion depth of the solution was negatively correlated with the injection velocity and the pumping ratio and positively correlated with the diffusion coefficient. A dynamic increase in diffusion depth was observed as the diffusion coefficient increased to 1 × 10−4 m2/s.

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Influence of mineral colloids and humic substances on uranium(VI) transport in water-saturated geologic porous media

Cited by 57 publications

References 80 publications

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

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

Distribution, behavior, and erosion of uranium in vineyard soils

Coupled Multifield Response to Coordinate Mining of Coal and Uranium: A Case Study

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