Variations in the mineral structures dominating solute mobilization during clay compaction

Qiu, Wenkai; Ma, Teng; Liu, Rui; Du, Yao

doi:10.1016/j.jhydrol.2022.127843

Cited by 11 publications

(2 citation statements)

References 154 publications

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“…The muddy sand (−9.7-−6.0 m) and sandy clay (depth −14.9-−9.7 m) layers exposed by borehole C3 had a high sand content, strong permeability, and insufficient water-rock interactions. The main component of sandy minerals was SiO 2 , which did not absorb Fe ions and DOM-like negatively charged clay minerals [4], so the overall Fe and Fe 2+ concentrations of this layer were low (Figure 4).…”

Section: Vertical Distribution and Environmental Factors Influencing ...mentioning

confidence: 99%

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Spatial Distribution and Factors Influencing the Various Forms of Iron in Alluvial–Lacustrine Clayey Aquitard

Chen,

Liu,

Jian

et al. 2023

Water

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The compression release of pore water in clayey aquitards has a significant impact on groundwater quality. Iron is an active variable element that mediates biochemical reactions in groundwater systems, but its transformation mechanisms in clayey aquitards remain unclear. The sediment and pore water samples from the shallow clayey aquitard (thickness = ~20 m) in the Chen Lake area of China were collected in three boreholes. The spatial distribution and influencing factors of Fe occurrence in the aquitard were revealed using hierarchical extraction, statistical analysis, and simulation calculations. The results indicate that the background value of alluvial–lacustrine sediments primarily affects the Fe concentration of clayey sediments. The dissimilatory reduction in free Fe oxide was the main source of Fe ions in pore water, resulting in a major percentage of Fe2+ in the total Fe concentration (0.07−5.91 mg/L). The abundant organic matter in organic-rich clay promoted a dissimilatory reduction in Fe (III) oxides, while the Fe concentrations of sediment and pore water were lower in the sand-rich stratum because of its weak adsorption capacity. The impact of human reclamation activities on the aquitard was mainly concentrated in the shallow layer (>−3 m), resulting in water drainage and O2 and CO2 input, which induced the crystallization of poorly crystalline Fe oxides. The input of reactive organic matter from reclaimed crops promoted the dissimilatory reduction in Fe oxides and the enrichment of Fe in deep pore water. The copious Fe2+ in deep stratum pore water tended to interact with CO32− and S2− to form coprecipitation with Fe (II). The concentrations of As, Cr, Sr, Zn, and Mn in pore water followed a similar variation trend to the Fe ion concentration, and their release could be attributed to the reduction dissolution of sediment Fe (III) oxides.

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Section: Vertical Distribution and Environmental Factors Influencing ...mentioning

confidence: 99%

“…The effect of aquitard on groundwater safety has raised widespread concern around the world [1][2][3][4]. The clayey sediment is a common aquitard in plains, formed by the evolution of loose surface sediments with a high moisture content [5].…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution and Factors Influencing the Various Forms of Iron in Alluvial–Lacustrine Clayey Aquitard

Chen,

Liu,

Jian

et al. 2023

Water

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Contaminant Migration in Construction and Demolition Waste Roadbeds Under Rainfall

Kan,

Zhou,

Yin

et al. 2024

Lecture Notes in Civil Engineering

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Hydroxylamine facilitated catalytic degradation of methylene blue in a Fenton-like system for heat-treatment modified drinking water treatment residues

Zhong

Wan

Lian

et al. 2023

Environ Sci Pollut Res

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Rational treatment of drinking water treatment residues (WTR) has become an environmental and social issue due to the risk of secondary contamination. WTR was commonly used to prepare adsorbents due to its clay-like pore structure, but further treatment is subsequently required. In this study, a Fenton-like system of H-WTR/HA/H 2 O 2 was constructed for degrading organic pollutants in water. Speci cally, in this study, WTR was modi ed by heat treatment to increase its adsorption active site, and accelerated Fe(III)/Fe(II) cycling on the catalyst surface by the addition of hydroxylamine (HA). Moreover, the effects of pH, HA and H 2 O 2 dosage on the degradation were discussed using methylene blue (MB) as the target pollutant. The mechanism of the action of HA was analyzed and the reactive oxygen species in the reaction system was determined. Combined with the reusability and stability experiments, the removal e ciency of MB remained 65.36% after 5 cycles, and this study may provide new insights into the resource utilization of WTR.Highlights WTR was employed as potential iron source and catalyst for Fenton-like system.Hydroxylamine promoted Fe (III)/Fe(II) cycling on the H-WTR surface •OH was the main reactive oxygen species in the H-WTR/HA/H 2 O 2 system

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Variations in the mineral structures dominating solute mobilization during clay compaction

Cited by 11 publications

References 154 publications

Spatial Distribution and Factors Influencing the Various Forms of Iron in Alluvial–Lacustrine Clayey Aquitard

Spatial Distribution and Factors Influencing the Various Forms of Iron in Alluvial–Lacustrine Clayey Aquitard

Contaminant Migration in Construction and Demolition Waste Roadbeds Under Rainfall

Hydroxylamine facilitated catalytic degradation of methylene blue in a Fenton-like system for heat-treatment modified drinking water treatment residues

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