Humic acid transport in saturated porous media: Influence of flow velocity and influent concentration

Wei, Xiaorong; Shao, Mingan; Du, Lina; Horton, Robert

doi:10.1016/j.jes.2014.06.034

Cited by 22 publications

(14 citation statements)

References 44 publications

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“…Deposition of colloidal SS is influenced by a very complex physicochemical interaction (Alem, Ahfir, Elkawafi, & Wang, ; Torkzaban et al, ; Wei, Shao, Du, & Horton, ). The colloid clogging process is very sensitive to the size of sand grains comprising the infiltration medium (d g ) and SS in the infiltration liquid (d p ; Rowe, Armstrong, & Cullimore, ; Shen & Ni, ).…”

Section: Introductionmentioning

confidence: 99%

Clogging of saturated porous media by silt‐sized suspended solids under varying physical conditions during managed aquifer recharge

Zhang

2018

Hydrological Processes

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Managed aquifer recharge is an effective method for utilizing excess flood flows, but clogging of porous media is a limiting factor in the implementation of this water storage technique. In recent years, much research on the physical clogging of porous media during artificial recharge has been conducted. However, the understanding of clogging due to silt-sized suspended solids (SS) is still inadequate, especially under varying physical conditions. Here, we subjected sand columns to controlled rates of flow and SS suspensions to investigate the influence of media size, SS size, SS concentration, and flow velocity on the clogging of porous media by silt-sized SS. The resultsshow that the diameter ratio of SS particles to sand grains is the dominant factor influencing the position of physical clogging. As pore velocity increased, the mobility of silt-sized SS was enhanced and retention in the porous media decreased noticeably.The spatial retention profiles in the porous media were found to vary greatly at different flow velocities. The SS concentration of the infiltrating suspension also dramatically influenced the mobility and deposition of silt-sized SS particles, such that high concentrations accelerated the clogging process. As the different physical factors changed, the breakthrough curves and retention profiles of silt-sized SS particles changed obviously and the mechanisms of retention differed. On the whole, clogging position is mainly determined by particle size ratio, but clogging rate is dominated by a variety of factors including particle size ratio, SS concentration, and flow velocity.

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Section: Introductionmentioning

confidence: 99%

Clogging of saturated porous media by silt‐sized suspended solids under varying physical conditions during managed aquifer recharge

Zhang

2018

Hydrological Processes

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“…The large value of β indicates the large diameter of pore channels in the whole fractal pore network. Obviously, the large pore diameter is sure to eliminate the ion friction and the electrical resistance of pore channels, [30][31][32] which is verified by the changes of values of l 0 and d 0 in Fig. 3.…”

Section: Influence Of Structural Parameters Of Fractal Network On Elementioning

confidence: 70%

“…Large value of γ basically means long pore channel of fractal network, which will cause the large ion friction in the pore channel and large impedance modulus. [30][31][32] Besides, when d 0 and l 0 are equal or more than 50 µm, the change of modulus of impedance is not evident with γ in Fig. 4.…”

Section: Influence Of Structural Parameters Of Fractal Network On Elementioning

confidence: 91%

“…It is demonstrated again that the comparably large size of mother pore channel has minor effect on the ion relaxation. [30][31][32] Figure 4 shows the modulus and phase development of impedance with γ when both d 0 and l 0 are equal to 10, 50, 100, 500 and 1000 µm. In Fig.…”

Section: Influence Of Structural Parameters Of Fractal Network On Elementioning

confidence: 99%

“…The mechanism behind is associated with the ion friction in pore channels. [30][31][32] It is expected that large tortuosity of conductive path considerably makes for the large ion friction.…”

Section: Influence Of Pore Tortuosity On Electrical Impedancementioning

confidence: 99%

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The Evaluation of Electrical Impedance of Three-Dimensional Fractal Networks Embedded in a Cube

et al. 2017

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This paper presents a preliminary work to evaluate the electrical impedance of threedimensional pore fractal networks embedded in a cube. The construction and structural parameters of pore and electrical networks are illustrated in detailed. The total impedance response (modulus and phase) of networks is primarily associated with structural parameter of network, pore structure parameter of cube, conductivity of pore and solid phases. The impedance response of cube with the evolution of fractal network is analyzed comprehensively in this work. Besides, the influence of conductivity of pore phase caused by different types of electrolytes, electrical frequencies and conductivity of solid phase on the total impedance response is systematically studied.

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Fractionation and transport of compost‐derived dissolved organic matter fractions in saturated red soil and black soil columns

Miao

Zhou

Rong

et al. 2023

Soil Science Soc of Amer J

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The fractionation and transport of compost‐derived dissolved organic matter (DOMC) could affect the transport and fate of nutrients and DOM‐associated pollutants in soil environment. In this study, the humic acid fraction (HAC) and fulvic acid fraction (FAC) of DOMC were selected to investigate the fractionation and transport of DOMC in repacked soil columns of a red soil and a black soil under different KCl concentrations. The effluent DOMC fractions were monitored by UV‐Visible light and fluorescence spectroscopy. The results showed that the molecular weight (MW) of the effluent DOM approached that of the influent DOMC fractions with the injection of DOMC fractions. Three‐dimensional fluorescence excitation emission matrices (3D‐EEMs) coupled with parallel factor analysis resolved three fluorescent components, i.e., low MW UV humic‐like substances (C1), high MW UV humic‐like substances (C2), and protein‐like substances (C3). The mobility of HAC and FAC decreased with increasing KCl concentrations (1 mM‐50 mM), implying that electrostatic interaction was an important mechanism for the retention of DOMC in soil columns. The fact that the mobility of DOMC fractions in the black soil was greater than that in the red soil could be attributed to the high free Fe oxide content in the red soil. The retained DOMC fractions did not entirely desorb by the background electrolyte solution, suggesting that a part of the DOMC fractions retained in soil columns was strongly bound. These results are helpful in understanding the fractionation and transport of DOMC in soil environments.This article is protected by copyright. All rights reserved

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Humic acid transport in saturated porous media: Influence of flow velocity and influent concentration

Cited by 22 publications

References 44 publications

Clogging of saturated porous media by silt‐sized suspended solids under varying physical conditions during managed aquifer recharge

Clogging of saturated porous media by silt‐sized suspended solids under varying physical conditions during managed aquifer recharge

The Evaluation of Electrical Impedance of Three-Dimensional Fractal Networks Embedded in a Cube

Fractionation and transport of compost‐derived dissolved organic matter fractions in saturated red soil and black soil columns

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