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

Tan, Bo; Dai, Chaomeng; Zhou, Hui; Hui, Zhenquan; Zhong, Guangfa; Zhang, Hong

doi:10.1002/hyp.11309

Cited by 8 publications

(3 citation statements)

References 64 publications

(82 reference statements)

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“…(1) Particle size difference: the movement of particles in porous media is affected by the particle size itself and the pore size of the media. When encountering pores with diameters smaller than the particles, exclusion effects may occur, causing the particles to be mechanically retarded outside the small pores [ 43 , 44 ]. Therefore, NBC is more prone to migration, due to its smaller particle size, while micrometer-sized bulk BC is more susceptible to exclusion effects, leading to retention in the media.…”

Section: Discussionmentioning

confidence: 99%

Migration Rules and Mechanisms of Nano-Biochar in Soil Columns under Various Transport Conditions

Li,

Yan,

et al. 2024

Nanomaterials

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Compared to traditional biochar (BC), nano-biochar (NBC) boasts superior physicochemical properties, promising extensive applications in agriculture, ecological environments, and beyond. Due to its strong adsorption and migration properties, NBC may carry nutrients or pollutants to deeper soil layers or even groundwater, causing serious environmental risks. Nevertheless, the migration rules and mechanisms of NBC in soil are still unclear. Therefore, this study employed soil column migration experiments to systematically explore the migration rules and mechanisms of NBC under various flow rates, initial soil water contents, soil depths, and soil textures. The results showed that regulated by smaller particle size differences and greater surface charges, NBC exhibited a stronger migration ability compared with traditional BC. As the soil texture transitioned from fine to coarse, the migration capability of NBC significantly improved, driven by both pore structure and interaction forces as described by the DLVO theory. The migration ability of NBC was also greatly boosted as the soil transitioned from saturated to unsaturated conditions, primarily because of preferential flow. When the flow rate increased from 70% KS to 100% KS and 130% KS, the migration ability of NBC also increased accordingly, as changes in injection flow rates altered the velocity distribution of pore water. NBC in 25 cm soil columns was more prone to shallow retention compared with 10 cm soil columns, resulting in weaker overall migration ability. In addition, through fitting of the two-site kinetic model and related parameters, the penetration curves of NBC under various variable conditions were effectively characterized. These findings could offer valuable insights for NBC’s future efficient, rational, and sustainable utilization, facilitating the evaluation and mitigation of its potential environmental risks.

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Section: Discussionmentioning

confidence: 99%

Migration Rules and Mechanisms of Nano-Biochar in Soil Columns under Various Transport Conditions

Li,

Yan,

et al. 2024

Nanomaterials

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“…115 Heterogeneous colloids are composed of various inorganic minerals and organic materials, and the combined effect of IS and grain size affects the stability and related transport behavior of colloids. 116 The transient flow with perturbations in chemistry (e.g., reduction in IS and increases in pH) of porewater results in the rapid release of colloids in the vadose zone. 22,117 It was notable that saline−freshwater interaction and rainfall infiltration in aquifers lead to a decrease in the salinity of porewater, eventually releasing colloids from the solid matrix.…”

Section: Formation and Retention Of Colloidsmentioning

confidence: 99%

“…From acid mine drainage, the Fe(II) contaminant was oxidized to form Fe(III)-containing colloids under GTF . Heterogeneous colloids are composed of various inorganic minerals and organic materials, and the combined effect of IS and grain size affects the stability and related transport behavior of colloids …”

Section: Colloid Formation and Transport In The Gtf Zonementioning

confidence: 99%

A Critical Review of Groundwater Table Fluctuation: Formation, Effects on Multifields, and Contaminant Behaviors in a Soil and Aquifer System

Wei,

Chen,

Cao

et al. 2024

Environ. Sci. Technol.

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The groundwater table fluctuation (GTF) zone is an important medium for the hydrologic cycle between unsaturated soil and saturated aquifers, which accelerates the migration, transformation, and redistribution of contaminants and further poses a potential environmental risk to humans. In this review, we clarify the key processes in the generation of the GTF zone and examine its links with the variation of the hydrodynamic and hydrochemistry field, colloid mobilization, and contaminant migration and transformation. Driven by groundwater recharge and discharge, GTF regulates water flow and the movement of the capillary fringe, which further control the advection and dispersion of contaminants in soil and groundwater. In addition, the formation and variation of the reactive oxygen species (ROS) waterfall are impacted by GTF. The changing ROS components partially determine the characteristic transformation of solutes and the dynamic redistribution of the microbial population. GTF facilitates the migration and transformation of contaminants (such as nitrogen, heavy metals, non-aqueous phase liquids, and volatile organic compounds) through colloid mobilization, the co-migration effect, and variation of the hydrodynamic and hydrochemistry fields. In conclusion, this review illustrates the limitations of the current literature on GTF, and the significance of GTF zones in the underground environment is underscored by expounding on the future directions and prospects.

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Silica colloids as non-carriers facilitate Pb2+ transport in saturated porous media under a weak adsorption condition: effects of Pb2+ concentrations

Dai

Zhou

You

et al. 2020

Environ Sci Pollut Res

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

Cited by 8 publications

References 64 publications

Migration Rules and Mechanisms of Nano-Biochar in Soil Columns under Various Transport Conditions

Migration Rules and Mechanisms of Nano-Biochar in Soil Columns under Various Transport Conditions

A Critical Review of Groundwater Table Fluctuation: Formation, Effects on Multifields, and Contaminant Behaviors in a Soil and Aquifer System

Silica colloids as non-carriers facilitate Pb2+ transport in saturated porous media under a weak adsorption condition: effects of Pb2+ concentrations

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