Sequentially Enhanced Electrokinetic Remediation of Heavy Metals in Low Buffering Clayey Soils

Reddy, Krishna R.; Chinthamreddy, Supraja

doi:10.1061/(asce)1090-0241(2003)129:3(263)

Cited by 136 publications

(58 citation statements)

References 23 publications

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“…During the EKR, the applied current causes oxidation and reduction at the anode and cathode, respectively and then leads to a series of coupled transport phenomena such as ionic migration, electroosmosis, and electrophoresis. Consequently, the pollutants are enriched near the electrodes and removed from the soil [8]. Ionic migration is the transport of charged complexes under an electric field.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic Remediation of Zinc and Copper Contaminated Soil: A Simulation-based Study

Rezaee¹,

Ghomesheh²,

Hosseini

2017

cej

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Electrokinetic is an effective and innovative method to remediate different kinds of soils, especially low permeable finedgrain soils such as silty and clayey soils. In this method, by applying a direct-current electric field into a contaminated soil resulted in different transport phenomena, the soil is remediated. This paper's objective is to propose a numerical model for Electrokinetic remediation of zinc and copper contaminated soils. Different transport phenomena including ion migration, electroosmosis flow, and diffusion were taken into account in the model. Chemical reactions such as precipitation/dissolution, adsorption onto the soil surface, and water chemical equilibrium were considered as well. Furthermore, instead of simplified boundary conditions (Neumann or Dirichlet) that cannot properly reflect the reality of the Electrokinetic remediation process, the realistic boundary conditions were used with consideration of flux and electrolysis reaction at the electrodes. The simulation results compared with the available experimental data in the literature. The coefficient of determination and the index of agreement indicated that the present model is consistent with the tests' results. Thus, the assumptions considered in the present study are acceptable.

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Section: Introductionmentioning

confidence: 99%

Electrokinetic Remediation of Zinc and Copper Contaminated Soil: A Simulation-based Study

Rezaee¹,

Ghomesheh²,

Hosseini

2017

cej

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“…However, the stability constants of Cd and Zn with them are lower than that with EDTA, indicating less heavy metals on the soil particle surface can be desorbed through formation complexes. The stability constants of Cd with tartaric acid is: 2.8 (CdH-tartaric [20][21][22]. After the EK remediation enhanced by tartaric acid and citric acid, Cd and Zn were also accumulated in the middle section soils, which was closely related to the pH variation of the middle section soils.…”

Section: +mentioning

confidence: 96%

“…Furthermore, the accumulation of Cd and Zn in the middle section soils was also observed. Although the complexes, such as Cd-Ac + , Cd-Ac 2 , Zn-Ac + , were also formed during the EK remediation, the stability constants of Cd-Ac + , Cd-Ac 2 , Zn-Ac + were very low with the values of 1.9, 3.2 and 1.5, respectively [20][21][22]. In view of the lower soil pH than other tests during EK remediation, reducing the soil pH may be the most important effect of acetate acid on enhancing heavy metal removal.…”

Section: +mentioning

confidence: 99%

Medium-scale ex suit electrokinetic remediation of Cd and Zn polluted soil enhanced by EDTA, tartaric acid, citric acid and acetic acid

Liu¹,

Li²,

Wang³

et al. 2017

Proceedings of the 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017)

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Abstract:The effect of enhancement agents on the efficiency of electrokinetic (EK) remediation of contaminated soils has been extensively studied in the past few years. However, the larger scale ex suit EK remediation with enhancement agents has been rarely reported. In this study, medium-scale EK remediation tests (20 kg dry soil at a single test) enhanced by EDTA, tartaric acid, citric acid and acetic acid were carried out to remove Cd and Zn from the contaminated soil. The removal efficiencies of Cd and Zn were enhanced by EDTA, tartaric acid and citric acid, and the enhanced effect of acetic acid on removal efficiencies of Cd and Zn was less. The highest removal efficiencies of Cd and Zn were 22.2% (citric acid) and 23.3% (tartaric acid), respectively. Low removal efficiencies were ascribed to the accumulations of Cd and Zn in F1 (exchangeable) and F2 (carbonate-associated) fractions in the middle section soils after EK remediation for all tests. After EK remediation, the F3 (reducible) concentrations of Cd and Zn, lower than initial concentrations, increased with the distance from the anode for all tests. The results suggested that F3 fraction can be transformed into F1 and F2 fractions, and F1, F2 and F3 fractions were removable during the EK remediation. Comparing with the control test (CT), more variations of total concentration and speciation of Cd and Zn were found, indicating apparent effects of enhancement agents on heavy metal removal during EK remediation. The results are significant for the enlargement of ex suit EK remediation.

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“…Entre estas magnitudes, la corriente de electrólisis, cuando se trabaja a potencial aplicado constante, es una de las reportadas habitualmente en la literatura científica [1][2][3][4][5][6][7][8][9][10][11][12]. Entre otros, podemos destacar estudios encaminados a la eliminación de metales pesados tales como Pb, Cd, Cr, Ni, Cu y Zn [1,5,7,[8][9][10][11][12], en los que la corriente † Dedicado a la Dra. …”

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“…Por otra parte, estudios sobre la disminución de la salinidad de suelos o la utilización de agentes complejantes como EDTA [2][3] para favorecer la eliminación de metales, han recurrido al análisis de la corriente de electrólisis con respecto al tiempo, para discutir sus resultados. También se ha utilizado dicho análisis en experimentos de electrorremediación que utilizan membranas selectivas a cationes en el proceso de eliminación de contaminantes [4], en estudios de la influencia de la capacidad buffer del suelo sobre el rendimiento de la eliminación [10] o en el estudio de procesos de eliminación múltiple simultánea [7]. Por último, cabe decir que en los últimos años, nuestro grupo de investigación ha llevado a cabo una serie de experiencias de "electro-caracterización" de suelos [13][14][15][16][17][18], en los cuales también se hace uso de la medida de la corriente de electrólisis.…”

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Correlation of the Physicochemical Properties in Soils from Tenerife Island, Measuring the Electric Current in an Electrokinetic Experiment

Vázquez

Arbelo

Hernández-Luis

et al. 2009

Port. Electrochim. Acta

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In this work the physical-chemical properties of six different soils original from Tenerife Island, Spain, are related with the measured electrical current in an electrokinetic experiment. Results show that total electrical charge has relation with properties such as: total metal content, pH, carbon organic content, and cationic exchange capacity. Since all these properties are between those which allow to evaluate the fertility of a soil, an electrokinetic experiment with samples of this soil is proposed like diagnosis tool.Keywords: electrokinetics, soil, electrolysis current, cationic exchange capacity. IntroducciónEs bien sabido que al aplicar técnicas electrocinéticas para la eliminación de contaminantes presentes en un suelo, proceso conocido como electrorremediación, resulta necesario analizar la evolución con el tiempo de algunas magnitudes fisicoquímicas y eléctricas relacionadas con el proceso, con el fin de mejorar su rendimiento. Entre estas magnitudes, la corriente de electrólisis, cuando se trabaja a potencial aplicado constante, es una de las reportadas habitualmente en la literatura científica [1][2][3][4][5][6][7][8][9][10][11][12]. Entre otros, podemos destacar estudios encaminados a la eliminación de metales pesados tales como Pb, Cd, Cr, Ni, Cu y Zn [1,5,7,[8][9][10][11][12], en los que la corriente † Dedicado a la Dra.

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Sequentially Enhanced Electrokinetic Remediation of Heavy Metals in Low Buffering Clayey Soils

Cited by 136 publications

References 23 publications

Electrokinetic Remediation of Zinc and Copper Contaminated Soil: A Simulation-based Study

Electrokinetic Remediation of Zinc and Copper Contaminated Soil: A Simulation-based Study

Medium-scale ex suit electrokinetic remediation of Cd and Zn polluted soil enhanced by EDTA, tartaric acid, citric acid and acetic acid

Correlation of the Physicochemical Properties in Soils from Tenerife Island, Measuring the Electric Current in an Electrokinetic Experiment

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