Advances and challenges of electrokinetic dewatering of clays and soils

Dizon, Arthur; Orazem, Mark E.

doi:10.1016/j.coelec.2020.03.002

Cited by 14 publications

(4 citation statements)

References 44 publications

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“…Also, owing to the alternate change of moisture in the soil, alternate swelling and shrinkage take place, which causes the development of cracks and heaves in the soil, resulting in the ultimate failure of the structure followed by economic loss. Several methodologies have been developed for the dewatering of clay through geosynthetic [4], preloading [5], electrokinetic [6], and chemical additives [7]. However, dewatering clay soil is always difficult due to its low permeability.…”

Section: Introductionmentioning

confidence: 99%

Geotechnical Properties of Fly Ash Blended Expansive Soil: A Review

Alam,

Alselami

2024

Civ Eng J

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Fly ash, an industrial byproduct, is used as both a building material and a soil stabilizer due to its pozzolanic properties. Moreover, it is challenging to extrapolate the results based on an inadequate amount of laboratory data because of the non-homogeneous character of the soil and the diversity in the chemical properties of fly ash. This review article fills in the gaps by providing an overview of the existing data related to the geotechnical characteristics of expansive soil stabilized with fly ash. The chemical composition of fly ash is provided in terms of oxides of various elements to help identify the kinds produced in different nations. Additionally, information about the physical and geotechnical characteristics of fly ash blended expansive soil is provided in order to comprehend the influence of the fly ash's chemical composition and the expansive soil's fines percentage. While the geotechnical property comprises Atterberg's limit, compaction, UCS, shear strength, free swelling index, CBR, and consolidation, the physical property includes specific gravity and durability. Shear modulus, damping ratio, and Poisson's ratio are used to describe the dynamic properties of the modified expansive soil. The published data in this field and the research gap will be identified by the researchers with the aid of this article. Doi: 10.28991/CEJ-SP2024-010-06 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Geotechnical Properties of Fly Ash Blended Expansive Soil: A Review

Alam,

Alselami

2024

Civ Eng J

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“…EK remediation, recognized for its efficacy in fine-grained soils, emerges as a viable alternative, overcoming the limitations of other techniques [24][25][26][27][28][29][30]. This method has been applied to soils contaminated with a spectrum of pollutants, including inorganic, organic, radioactive, and anionic contaminants [31][32][33][34][35][36]. Nonetheless, challenges such as hydroxide precipitation and reduced mobility, as well as precipitation of heavy metals at the cathode, have been observed [37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Permeable Reactive Barrier Remediation Technique Using Carbonized Food Waste in Ground Contaminated with Combined Cu and Pb

Kim,

Lee

et al. 2024

Sustainability

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In recent years, with the escalation of food waste generation, stringent legal constraints on landfill usage and incineration have necessitated the exploration of alternative disposal methods, augmenting interest in diverse recycling strategies. Notably, carbonized food waste (CFW), a byproduct of food waste carbonization, has emerged as an efficacious adsorbent for pollutant removal. This study focuses on the application of in situ remediation techniques, specifically electrokinetic (EK) remediation combined with enhancers, to decontaminate soil afflicted with single or multiple heavy metals. The utilization of a permeable reactive barrier (PRB) infused with CFW aims to mitigate secondary environmental repercussions, including the propagation of contaminants in soil and groundwater. Experiments were conducted on clay samples contaminated with copper, lead, or a combination thereof. Observations revealed that the current density peaked during the initial 1–2 days of the experiment, experienced a resurgence post-electrode exchange, and subsequently diminished. The efficacy of metal removal was predominantly pronounced for copper, with remediation rates ranging from 85% to 92% in singly contaminated samples and 75% to 89% in dually contaminated samples after a 10-day treatment period, incorporating an electrode exchange on the eighth day. Conversely, the efficacy of lead removal was markedly lower, with rates of 0.6% to 33% in singly contaminated samples and 14% to 25% in combined contamination scenarios, suggesting the necessity for extended treatment durations. The post-experimental moisture content indicated successful enhancer injection. Additionally, pH measurements affirmed that heavy metals migrated effectively within the sample matrix, facilitated by the EK phenomenon after the electrode exchange. This study highlights the potential of CFW within PRBs for the remediation of heavy metal-contaminated soils, although the removal efficiencies between different metals is variable, emphasizing the need for tailored approaches in the treatment of lead-contaminated environments.

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“…28,29 When dealing with small permeability substances, such as fine soils, sediments and sludge, electroosmotic dewatering is preferred over standard dewatering procedures. 30 The initiating work developed by Casagrande 31 has been successfully applied to industrial applications as diverse as soil consolidation, 32,33 sludge dewatering, 34 soil remediation, 35,36 food engineering, 37 metallurgical residues [38][39][40][41] and nuclear applications. 42 For charge distributions, Chang and Wang 43 used the DH approximation for steady-state rotating EOF.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and hydromagnetic electroosmotic Von Kármán swirling flow from a rotating porous disc to a permeable medium with viscous heating and Joule dissipation

Balaji¹,

Prakash²,

Tripathi

et al. 2023

Heat Trans

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Magnetohydrodynamic flow and heat transfer in an ionic viscous fluid in a porous medium induced by a stretching spinning disc and modulated by electroosmosis under an axial magnetic field and radial electrical field is presented in this study. The effects of convective wall boundary conditions, Joule heating and viscous dissipation are incorporated. The governing partial differential conservation equations are transformed into a system of self‐similar coupled, nonlinear ordinary differential equations with associated boundary conditions. The Matlab bvp4c solver featuring a shooting technique and the fourth‐order Runge–Kutta–Fehlberg method are used to numerically solve the governing dimensionless boundary value problem. Multivariate analysis is also performed to examine the thermal characteristics. An increase in rotation parameter induces a reduction in the radial velocity, whereas it elevates the tangential velocity. Greater electrical field parameter strongly damps the radial velocity whereas it slightly decreases the tangential velocity. Increasing magnetic parameter also damps both the radial and tangential velocities. An increment in electroosmotic parameter substantially decelerates the radial flow but has a weak effect on the tangential velocity field. Increasing permeability parameter (inversely proportional to permeability) markedly damps both radial and tangential velocities. The pressure gradient is initially enhanced near the disk surface but reduced further from the disk surface with increasing magnetic parameter and electrical field parameter, whereas the opposite effect is produced with increasing Joule dissipation. Increasing magnetic and rotational parameters generate a strong heating effect and boost temperature and thermal boundary layer thickness. Nusselt number is boosted with increasing Brinkman number (viscous heating effect) and Reynolds number. The simulations are relevant to electromagnetic coating flows, bioreactors and electrochemical sensing technologies in medicine.

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Advances and challenges of electrokinetic dewatering of clays and soils

Cited by 14 publications

References 44 publications

Geotechnical Properties of Fly Ash Blended Expansive Soil: A Review

Geotechnical Properties of Fly Ash Blended Expansive Soil: A Review

Permeable Reactive Barrier Remediation Technique Using Carbonized Food Waste in Ground Contaminated with Combined Cu and Pb

Heat transfer and hydromagnetic electroosmotic Von Kármán swirling flow from a rotating porous disc to a permeable medium with viscous heating and Joule dissipation

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