Study on Electroosmotic Consolidation of Sludge Using EKG

Fang, Xiao; Kang-shi, Zhuang Yan-feng Guo; Zhuang, Yan-Feng

doi:10.1007/s40891-021-00273-y

Cited by 12 publications

(7 citation statements)

References 9 publications

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“…The electrode used in this study is a plate-type electrokinetic geosynthetic electrode (EKG), which is now widely applied in practical engineering due to its excellent corrosion resistance [17]. The potential probe is made of copper, due to its chemical stability and resistance to corrosion.…”

Section: Test Equipmentmentioning

confidence: 99%

Experimental Study on improved method of electroosmosis combined with magnetic field

Xu,

Zhou,

Jiang

et al. 2024

Preprint

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Optimizing electroosmotic efficiency through enhanced electrochemical reactions has garnered significant attention in recent research. This study pioneers the integration of magnetic field technology within electroosmosis framework to reduce interface resistance and improve efficiency, deriving its theoretical basis from comprehensive magnetoelectrochemical studies. Experiments confirm a substantial effect of magnetic fields, pinpointing the anode as the optimal location for application. Specifically, the magnetic field drastically lowers interface resistance and sustains a high current, facilitating increased electrochemical reaction rates. This improvement is theoretically linked to the Lorentz force generated by the perpendicular intersection of magnetic and electric fields, enhancing ion convection and mass transfer across the soil-electrode interface, a process often hindered by low-permeability soils. Further analysis on the drainage enhancement demonstrates the ability of the anode-arranged magnetic field to significantly increase the drainage capacity and reduce treatment time. Electrochemical parameter analysis corroborates this ability to accelerate the drainage rate by its impact on the electrochemical reactions. In terms of energy consumption, analysis was conducted from multiple perspectives such as interface energy consumption, total energy consumption, and energy utilization rate, proving that strategic placement of a magnetic field at the anode significantly optimizes energy dynamics within the electroosmosis process. Additionally, the deployment of reusable permanent magnets promotes sustainability and cost-effectiveness. These advancements collectively contribute to the potential of magnetic field-assisted electroosmosis in engineering applications. While these developments represent substantial progress, there remains room for deeper exploration. Future research is projected to delve into the intricacies of magnetic field mechanisms and the refinement of design parameters to fortify their application in engineering practices.

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Section: Test Equipmentmentioning

confidence: 99%

Experimental Study on improved method of electroosmosis combined with magnetic field

Xu,

Zhou,

Jiang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The vertical electrodes are widely used due to the relatively easy of construction and installation. However, the soil near the vertical anodes tends to crack, leading to the problem of increased electrical resistance, reduced electro‐osmotic efficiency, and non‐uniform soil reinforcement in the horizontal plane 17–19 . Recently, the horizontal electrode has attracted attention in ground improvement engineering due to its ability to minimize the soil cracks near the anode, enable the treated soil to be uniform in horizontal direction, and facilitate simultaneous dredging and consolidation 20,21 .…”

Section: Introductionmentioning

confidence: 99%

“…However, the soil near the vertical anodes tends to crack, leading to the problem of increased electrical resistance, reduced electro-osmotic efficiency, and non-uniform soil reinforcement in the horizontal plane. [17][18][19] Recently, the horizontal electrode has attracted attention in ground improvement engineering due to its ability to minimize the soil cracks near the anode, enable the treated soil to be uniform in horizontal direction, and facilitate simultaneous dredging and consolidation. 20,21 As is well known, the pore water can usually flow through the horizontal electrodes, which may result in the backfilled sand layer above the cathode and the unelectroosmotic layer under the anode affecting the drainage process of the electroosmotic layer.…”

mentioning

confidence: 99%

Analytical models for electroosmotic consolidation of layered soil systems considering the boundary effects of horizontal electrodes

Li,

Chen,

Zhuang

et al. 2024

Num Anal Meth Geomechanics

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The pore water can usually flow through the horizontal electrodes, resulting in the top sand layer and the bottom unelectroosmotic layer inevitably affecting the consolidation process of the electroosmotic layer. However, the traditional assumption of the fully drained or undrained electrode boundaries is unable to reflect these boundary effects. In this study, one‐dimensional analytical models for electroosmotic consolidation of the layered soil systems considering the boundary effects of horizontal electrodes are proposed. The solutions for the models are derived using the separate variable method and Laplace transform method. The rationality of the one‐dimensional model is also illustrated by comparing it with the results produced by the two‐dimensional model and the accuracies of the solutions are verified through a series of analytical and numerical validation examples. Parametric studies are conducted to investigate the effects of the sand layer and the unelectroosmotic layer on the consolidation process. Results show that both the sand layer and the unelectroosmotic layer may significantly delay the consolidation progress. The time factor corresponding to 90% average degree of consolidation (Tv_90%U*) can increase by over 1.5 times in comparison with the model without a sand layer when the permeability coefficient ratio of the subsoil to the upper layer reaches 10. The delayed effect is particularly pronounced when the thickness of the unelectroosmotic layer with higher compressibility is relatively larger, potentially resulting in a tenfold or even greater increase in Tv_90%U*.

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“…The study found that this method improved shear strength and bearing capacity of treated soil while reducing the consolidation period. Xiao et al (2021) conducted lab tests using aluminum, copper, iron, and EKG electrodes. Results indicated that under a voltage gradient of 150 V/m, EKG electrodes led to higher efficiency in electroosmosis compared to aluminum, copper, and iron electrodes.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrode materials and potential gradient on electro-osmotic consolidation for marine clayey soils

Jin,

Zhang,

Wang

et al. 2024

Front. Earth Sci.

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This study conducted experimental investigations into the effects of electrode material and potential gradient on the effectiveness of electro-osmotic consolidation (EO) in strengthening soft soils. Seven laboratory tests were conducted on high-water-content marine clayey soils through EO. In these experimental tests, four different types of electrodes made of steel, copper, aluminum, and composite carbon fiber (CCF) were employed in four tests each to evaluate the consolidation effectiveness. Additionally, four tests, one was the comparitive study for different eletrode materials, were carried out to determine the optimal gradient for the EO using CCF electrode. Several critical properties of the tested soils were examined and evaluated in this study, including the effective voltage utilization, potential distribution, water discharge, discharge rate, energy consumption, and soil bearing capacity. The test results indicated that the CCF electrode had superior performance in water discharge, discharge rate, and average soil water content compared to metal electrodes. Furthermore, CCF led to uniform enhancement of soil strength, with treated soil bearing capacities 6.3 to 12 times higher than initial values, and 1.9 to 2.5 times higher than those attained with metal electrodes. Additionally, an effective potential gradient of 1 V/cm was identified for the EO with the CCF electrode, providing a higher discharge rate and a larger soil strength in a uniform distribution. Moreover, the use of CCF electrode significantly reduced corrosion compared to metal electrodes during the consolidation process, further contributing to improved consolidation efficiency. This study offers valuable insights and recommendations for the utilization of CCF in marine clayey soils, effectively addressing the challenges posed by electrode corrosion and high energy consumption in EO applications.

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Study on Electroosmotic Consolidation of Sludge Using EKG

Cited by 12 publications

References 9 publications

Experimental Study on improved method of electroosmosis combined with magnetic field

Experimental Study on improved method of electroosmosis combined with magnetic field

Analytical models for electroosmotic consolidation of layered soil systems considering the boundary effects of horizontal electrodes

Effects of electrode materials and potential gradient on electro-osmotic consolidation for marine clayey soils

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