Experimental study of the effect of material and arrangement of electrodes and voltage on the electro-remediation of saturated clays containing chloride and sulfate ions

Fahadani, Alireza Ebrahimi; Oulapour, Masoud; Jaafarzadeh, Nematollah

doi:10.1007/s12517-018-4013-5

Cited by 4 publications

(4 citation statements)

References 38 publications

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“…In this process, charged ions in the soil media move toward the electrode with an opposite charge through electromigration while pore water moves toward the cathode through electro‐osmosis (Bahemmat et al, 2015; Li et al, 2014). Fahadani et al (2018) noticed that electromigration was the dominant mechanism at polluted sites with a lower concentration of charged ions (concentration of Cl − is about 350 mg L −1 ) and electroosmosis was the dominant mechanism at polluted sites with higher concentration of charged ions (concentration of Cl − is about 1150 mg L −1 ). Thus, the vertical “electric sieve” can prevent the upward movement of Na + and Cl − with the rising artificial saline groundwater and significantly block electroosmosis as well as the migration and distribution of other cations (K + , Ca 2+ , and Mg 2 ) and anions (NO 3 − and SO 4 2− ) as a result of electromigration.…”

Section: Discussionmentioning

confidence: 99%

“…Soil moisture levels are lost due to the electrolytic nature of water in the EK system and its subsequent high consumption of water. Moreover, the heating effect between the anode and cathode at higher resistances can lead to a decrease in soil moisture (Fahadani et al, 2018). This decline in soil moisture, in conjunction with the movement of charged ions toward the electrode with an opposite charge, results in increased soil resistance as well as decreased soil conductivity and current (Bahemmat et al, 2015; Klouche et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Application of a vertical ‘electric sieve’ to mitigate and prevent salinization in coastal soil

Zhao

Huang

et al. 2022

Land Degrad Dev

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This study explored the applications of a vertical electrokinetic system (V-EK), which consists of multilayer electrodes positioned in shallow soil to form an 'electric sieve' to mitigate and prevent soil salinization caused by salts rising from saline groundwater in coastal areas. The experiments were conducted in column reactors in the laboratory. Compared to the control column, the level of ions in the surface soil was significantly reduced after the V-EK treatment, particularly for the column with voltages at 10 V and 20 V. At a voltage of 20 V, Na + was detected at a range of 0.06-0.08 mg g À1 in the surface soil; this is a >99% reduction compared to the controls. Similar efficacy was observed for Cl À in the V-EK column. The concentrations of Cl À were detected with a range of 0.01-0.02 mg g À1 and 0.02-0.06 mg g À1 at the surface soil with a voltage of 20 V and 10 V, respectively, compared to the Cl À concentrations at 0.84-2.70 mg g À1 in the control. After the application of the vertical 'electric sieve', the total salt content of surface soil could be controlled at a low value (<0.25‰) at voltages of 10 V and 20 V, compared to that in the control column (4.86‰). Finally, rising of salts from the artificial saline groundwater was effectively mitigated under voltages of 10 V and 20 V. Results from this work have demonstrated that the 'electric sieve' can effectively mitigate and prevent salts from rising in shallow groundwater to surface soil and reduce soil salinity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Application of a vertical ‘electric sieve’ to mitigate and prevent salinization in coastal soil

Zhao

Huang

et al. 2022

Land Degrad Dev

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“…e theoretical explanation of electrokinetic and electroosmosis phenomena has been explained in detail in the literature [15,[30][31][32][33]. Researchers have shown that many factors such as soil content, pH and zeta potential, electrode type, applied electric field, and conductivity of the medium affect electrokinetic processes [34][35][36][37][38]. Shang [39] states that electroosmotic permeability depends on a number of factors including tailing mineralogy, void ratio, zeta potential, applied voltage, and current.…”

Section: Introductionmentioning

confidence: 99%

Electroosmotic Dewatering of Iron Ore Tailings: A Laboratory Study to Improve Geotechnical Properties

Yüksek

2022

Advances in Civil Engineering

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Minerals are subjected to ore processing to turn them into usable and saleable raw materials. First of all, the ore is reduced to the smallest size with the crushing-grinding process, and after using water and chemical additives, according to the characteristics of the ore, useful minerals are taken, and unwanted minerals are stored in the tailings pools. Approximately, 26 million tons of mineral wastes were generated annually from ore processing facilities in Turkey. The construction of tailings pools, the stability of the tailing sludge, and the safety of dams are a burdensome issue faced by miners. In the ore plants, an average of 3 tons of water is used to enrich 1 ton of ore, and most of the wastewater cannot be removed by traditional methods, causing various economic, environmental, and stability problems. In this study, the dewatering of an iron ore tailing by applying different voltages by the electroosmosis method was investigated in the laboratory environment. By discharging the water of the iron ore tailings by the electroosmosis method, the solid content was increased from 43.01% to 87.63%. Thus, it has been observed that there will be a significant improvement in the geotechnical properties of the tailings’ material. It has been estimated that electroosmotic dewatering rises with increasing the voltage gradient and the energy consumption varies in the range of 0.588–30.645 kWh/dry ton. The void ratio decreased from 5.58% to 0.23%. In the dewatering experiments, different parameters such as the amount of water discharged, density, void ratio, water content, and power consumed were measured or calculated and the relationships between them were discussed with graphics. In electroosmosis experiments, it has been observed that besides the voltage applied in the discharge of water, the mineralogy of the tailings has a significant effect. Since there are serious abrasions on the electrodes used in the experiments, alternative electrodes should be tried.

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Experimental analysis of the effect of mineral composition and water content of clay soil on electroosmotic efficiency

Zhou

Fang²,

Chen

et al. 2020

Bull Eng Geol Environ

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Experimental study of the effect of material and arrangement of electrodes and voltage on the electro-remediation of saturated clays containing chloride and sulfate ions

Cited by 4 publications

References 38 publications

Application of a vertical ‘electric sieve’ to mitigate and prevent salinization in coastal soil

Application of a vertical ‘electric sieve’ to mitigate and prevent salinization in coastal soil

Electroosmotic Dewatering of Iron Ore Tailings: A Laboratory Study to Improve Geotechnical Properties

Experimental analysis of the effect of mineral composition and water content of clay soil on electroosmotic efficiency

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