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Erika Bustos - One of the best experts on this subject based on the ideXlab platform.

  • Influence of EDTA on the Electrochemical Removal of Mercury (II) in Soil from San Joaquín, Querétaro, México
    Journal of the Mexican Chemical Society, 2017
    Co-Authors: Irma Robles, G. Hernández, S. Solís, T. Serrano, J. J. Pérez, R. García, Erika Bustos
    Abstract:

    The removal of mercury from soil and Ca-bentonite was performed using electrochemical Treatment adding ethylendiamine- tetra acetic acid (EDTA) as a complexing agent to improve the elec- trochemical removal of Hg (II) in soil from San Joaquin, Queretaro, Mexico. During the Electrokinetic Treatment in the presence of 0.1 M EDTA, most of Hg (II) migrates toward the anode obtaining the high- est removal efficiencies close to 70 % in bentonite after 9 h. Using 0.1M HCl only 65 % efficiency was attained after 13 h in the cathodic side. EDTA formed a negatively charged stable complex that migrates to the cathode by the application of the Electrokinetic Treatment across Hg - EDTA synthesized complex.

  • assessment of iro2 ta2o5 ti electrodes for the Electrokinetic Treatment of hydrocarbon contaminated soil using different electrode arrays
    Electrochimica Acta, 2016
    Co-Authors: M G Olvera, O. Cuevas, Rosa Alhelí Herrada, J. L. Corona, Ignasi Sirés, S Sepulvedaguzman, Erika Bustos
    Abstract:

    Abstract In recent years, physicochemical processes such as Electrokinetic Treatment (EKT) have gained acceptance as suitable alternatives to restore hydrocarbon (HC)-contaminated sites. EKT entails relatively short times and high removal efficiencies, usually being applied in heterogeneous soils with low permeability. In this work, 1D (one-dimensional) and 2D (two-dimensional) configurations have been tested employing Ti cathodes and anodes, as well as purpose-made IrO2-Ta2O5|Ti as dimensionally-stable anodes (DSA®). After EKT and from GC-MS analysis of fat and oil content, it has been found that the radial 2D array with one central Ti cathode and six IrO2-Ta2O5|Ti anodes performed the best removal efficiency of hydrocarbons. The removal efficiencies of using modified electrodes with a configuration of circular 2D electrodes had double the removal efficiency (58%) over the use of a configuration of face-to- face 1D array (21%) with the IrO2-Ta2O5|Ti anode and Ti cathode. Finally, the superficial morphology of IrO2-Ta2O5|Ti anode and Ti cathode were not affected by EKT, which was demonstrated with the same appearance before and after EKT in the micrographs obtained by SEM.

  • Assessment of IrO2-Ta2O5|Ti electrodes for the Electrokinetic Treatment of hydrocarbon-contaminated soil using different electrode arrays
    Electrochimica Acta, 2016
    Co-Authors: O. Cuevas, M G Olvera, Rosa Alhelí Herrada, J. L. Corona, Selene Sepúlveda-guzmán, Ignasi Sirés, Erika Bustos
    Abstract:

    Abstract In recent years, physicochemical processes such as Electrokinetic Treatment (EKT) have gained acceptance as suitable alternatives to restore hydrocarbon (HC)-contaminated sites. EKT entails relatively short times and high removal efficiencies, usually being applied in heterogeneous soils with low permeability. In this work, 1D (one-dimensional) and 2D (two-dimensional) configurations have been tested employing Ti cathodes and anodes, as well as purpose-made IrO2-Ta2O5|Ti as dimensionally-stable anodes (DSA®). After EKT and from GC-MS analysis of fat and oil content, it has been found that the radial 2D array with one central Ti cathode and six IrO2-Ta2O5|Ti anodes performed the best removal efficiency of hydrocarbons. The removal efficiencies of using modified electrodes with a configuration of circular 2D electrodes had double the removal efficiency (58%) over the use of a configuration of face-to- face 1D array (21%) with the IrO2-Ta2O5|Ti anode and Ti cathode. Finally, the superficial morphology of IrO2-Ta2O5|Ti anode and Ti cathode were not affected by EKT, which was demonstrated with the same appearance before and after EKT in the micrographs obtained by SEM.

  • Electrokinetic Treatment of polluted soil at pilot level coupled to an advanced oxidation process of its wastewater
    Physics and Chemistry of the Earth Parts A B C, 2016
    Co-Authors: B. Ochoa, L. Ramos, A. Garibay, M. Pérez-corona, M.c. Cuevas, Jesús Cárdenas, M. Teutli, Erika Bustos
    Abstract:

    Abstract Soil contaminated with hydrocarbons is a current problem of great importance. These contaminants may be toxic, can retain water and block gas exchange with the atmosphere, which produces a poor-quality soil unsuitable for ecological health. Electroremediation is among the Treatments for the removal of such contaminants. In this research, a pilot-level electroremediation test was applied using a circular arrangement of electrodes with a Ti cathode at the middle of the cell surrounded by six IrO 2 –Ta 2 O 5 | Ti anodes. The presence of an NaOH electrolyte helps to develop the electromigration and electro-osmosis of gasoline molecules (at 1126 mg kg −1 ) surrounded by Na + ions. The hydrocarbons are directed towards the cathode and subsequently removed in an aqueous Na + – hydrocarbon solution, and the –OH migrates to the anode. During Electrokinetic Treatment, the physicochemical characteristics of the soil close to either the cathode or anode and at the half-cell were evaluated during the three weeks of Treatment. During that time, more than 80% of hydrocarbons were removed. Hydrocarbons removed by the Electrokinetic Treatment of gasoline-polluted soil were collected in a central wastewater compartment and subsequently treated with a Fenton-type advanced oxidation process. This achieved more than 70% mineralization of the hydrocarbons to CO 2 and H 2 O within 1.5 h; its low toxicity status was verified using the Deltatox ® kit test. With this approach, the residual water complied with the permissible limits of COD, pH, and electrical conductivity for being discharged into water bodies, according to Mexican norm NOM-001-SEMARNAT-1996.

  • Electrokinetic Treatment of mercury polluted soil facilitated by ethylenediaminetetraacetic acid coupled with a reactor with a permeable reactive barrier of iron to recover mercury ii from water
    Electrochimica Acta, 2015
    Co-Authors: Irma Robles, M J Lozano, M G Olvera, G. Hernández, S. Solís, Erika Bustos
    Abstract:

    Abstract A soil sample polluted with mercury was treated with Electrokinetic Treatment (EKT). Seventy-two h was necessary to remove most of the mercury present in soil from the cathode to the anode with a removal percentage of 76.30%. During this period, we measured the interfacial potential and current. We analyzed the physicochemical properties before and after EKT where physical properties such as color, soil particle, real density, porosity and fraction of organic matter did not change; chemical properties such as pH and electric conductivity changed due to the electric field applied to the soil and the addition of ethylenediaminetetraacetic acid as a facilitating agent. Finally, the remaining solution obtained from the EKT was treated in a reactor with a permeable reactive barrier of Fe°, where 84.47% of the Hg 2+ was recovered from water.

O. Cuevas - One of the best experts on this subject based on the ideXlab platform.

  • assessment of iro2 ta2o5 ti electrodes for the Electrokinetic Treatment of hydrocarbon contaminated soil using different electrode arrays
    Electrochimica Acta, 2016
    Co-Authors: M G Olvera, O. Cuevas, Rosa Alhelí Herrada, J. L. Corona, Ignasi Sirés, S Sepulvedaguzman, Erika Bustos
    Abstract:

    Abstract In recent years, physicochemical processes such as Electrokinetic Treatment (EKT) have gained acceptance as suitable alternatives to restore hydrocarbon (HC)-contaminated sites. EKT entails relatively short times and high removal efficiencies, usually being applied in heterogeneous soils with low permeability. In this work, 1D (one-dimensional) and 2D (two-dimensional) configurations have been tested employing Ti cathodes and anodes, as well as purpose-made IrO2-Ta2O5|Ti as dimensionally-stable anodes (DSA®). After EKT and from GC-MS analysis of fat and oil content, it has been found that the radial 2D array with one central Ti cathode and six IrO2-Ta2O5|Ti anodes performed the best removal efficiency of hydrocarbons. The removal efficiencies of using modified electrodes with a configuration of circular 2D electrodes had double the removal efficiency (58%) over the use of a configuration of face-to- face 1D array (21%) with the IrO2-Ta2O5|Ti anode and Ti cathode. Finally, the superficial morphology of IrO2-Ta2O5|Ti anode and Ti cathode were not affected by EKT, which was demonstrated with the same appearance before and after EKT in the micrographs obtained by SEM.

  • Assessment of IrO2-Ta2O5|Ti electrodes for the Electrokinetic Treatment of hydrocarbon-contaminated soil using different electrode arrays
    Electrochimica Acta, 2016
    Co-Authors: O. Cuevas, M G Olvera, Rosa Alhelí Herrada, J. L. Corona, Selene Sepúlveda-guzmán, Ignasi Sirés, Erika Bustos
    Abstract:

    Abstract In recent years, physicochemical processes such as Electrokinetic Treatment (EKT) have gained acceptance as suitable alternatives to restore hydrocarbon (HC)-contaminated sites. EKT entails relatively short times and high removal efficiencies, usually being applied in heterogeneous soils with low permeability. In this work, 1D (one-dimensional) and 2D (two-dimensional) configurations have been tested employing Ti cathodes and anodes, as well as purpose-made IrO2-Ta2O5|Ti as dimensionally-stable anodes (DSA®). After EKT and from GC-MS analysis of fat and oil content, it has been found that the radial 2D array with one central Ti cathode and six IrO2-Ta2O5|Ti anodes performed the best removal efficiency of hydrocarbons. The removal efficiencies of using modified electrodes with a configuration of circular 2D electrodes had double the removal efficiency (58%) over the use of a configuration of face-to- face 1D array (21%) with the IrO2-Ta2O5|Ti anode and Ti cathode. Finally, the superficial morphology of IrO2-Ta2O5|Ti anode and Ti cathode were not affected by EKT, which was demonstrated with the same appearance before and after EKT in the micrographs obtained by SEM.

M G Olvera - One of the best experts on this subject based on the ideXlab platform.

  • assessment of iro2 ta2o5 ti electrodes for the Electrokinetic Treatment of hydrocarbon contaminated soil using different electrode arrays
    Electrochimica Acta, 2016
    Co-Authors: M G Olvera, O. Cuevas, Rosa Alhelí Herrada, J. L. Corona, Ignasi Sirés, S Sepulvedaguzman, Erika Bustos
    Abstract:

    Abstract In recent years, physicochemical processes such as Electrokinetic Treatment (EKT) have gained acceptance as suitable alternatives to restore hydrocarbon (HC)-contaminated sites. EKT entails relatively short times and high removal efficiencies, usually being applied in heterogeneous soils with low permeability. In this work, 1D (one-dimensional) and 2D (two-dimensional) configurations have been tested employing Ti cathodes and anodes, as well as purpose-made IrO2-Ta2O5|Ti as dimensionally-stable anodes (DSA®). After EKT and from GC-MS analysis of fat and oil content, it has been found that the radial 2D array with one central Ti cathode and six IrO2-Ta2O5|Ti anodes performed the best removal efficiency of hydrocarbons. The removal efficiencies of using modified electrodes with a configuration of circular 2D electrodes had double the removal efficiency (58%) over the use of a configuration of face-to- face 1D array (21%) with the IrO2-Ta2O5|Ti anode and Ti cathode. Finally, the superficial morphology of IrO2-Ta2O5|Ti anode and Ti cathode were not affected by EKT, which was demonstrated with the same appearance before and after EKT in the micrographs obtained by SEM.

  • Assessment of IrO2-Ta2O5|Ti electrodes for the Electrokinetic Treatment of hydrocarbon-contaminated soil using different electrode arrays
    Electrochimica Acta, 2016
    Co-Authors: O. Cuevas, M G Olvera, Rosa Alhelí Herrada, J. L. Corona, Selene Sepúlveda-guzmán, Ignasi Sirés, Erika Bustos
    Abstract:

    Abstract In recent years, physicochemical processes such as Electrokinetic Treatment (EKT) have gained acceptance as suitable alternatives to restore hydrocarbon (HC)-contaminated sites. EKT entails relatively short times and high removal efficiencies, usually being applied in heterogeneous soils with low permeability. In this work, 1D (one-dimensional) and 2D (two-dimensional) configurations have been tested employing Ti cathodes and anodes, as well as purpose-made IrO2-Ta2O5|Ti as dimensionally-stable anodes (DSA®). After EKT and from GC-MS analysis of fat and oil content, it has been found that the radial 2D array with one central Ti cathode and six IrO2-Ta2O5|Ti anodes performed the best removal efficiency of hydrocarbons. The removal efficiencies of using modified electrodes with a configuration of circular 2D electrodes had double the removal efficiency (58%) over the use of a configuration of face-to- face 1D array (21%) with the IrO2-Ta2O5|Ti anode and Ti cathode. Finally, the superficial morphology of IrO2-Ta2O5|Ti anode and Ti cathode were not affected by EKT, which was demonstrated with the same appearance before and after EKT in the micrographs obtained by SEM.

  • Electrokinetic Treatment of mercury polluted soil facilitated by ethylenediaminetetraacetic acid coupled with a reactor with a permeable reactive barrier of iron to recover mercury ii from water
    Electrochimica Acta, 2015
    Co-Authors: Irma Robles, M J Lozano, M G Olvera, G. Hernández, S. Solís, Erika Bustos
    Abstract:

    Abstract A soil sample polluted with mercury was treated with Electrokinetic Treatment (EKT). Seventy-two h was necessary to remove most of the mercury present in soil from the cathode to the anode with a removal percentage of 76.30%. During this period, we measured the interfacial potential and current. We analyzed the physicochemical properties before and after EKT where physical properties such as color, soil particle, real density, porosity and fraction of organic matter did not change; chemical properties such as pH and electric conductivity changed due to the electric field applied to the soil and the addition of ethylenediaminetetraacetic acid as a facilitating agent. Finally, the remaining solution obtained from the EKT was treated in a reactor with a permeable reactive barrier of Fe°, where 84.47% of the Hg 2+ was recovered from water.

Claudio Cameselle - One of the best experts on this subject based on the ideXlab platform.

  • Analysis and Optimization of Mn Removal from Contaminated Solid Matrixes by Electrokinetic Remediation.
    International journal of environmental research and public health, 2020
    Co-Authors: Claudio Cameselle, Susana Gouveia, Adrian Cabo
    Abstract:

    Electrokinetic remediation is a useful technique for the removal of ionic contaminants in soils, sediments, sludges, and other solid porous matrixes. The efficiency of metal removal and the electricity consumption in the Electrokinetic Treatment of soils largely depend on electric and physicochemical conditions. This study analyzes the Electrokinetic Treatment of Mn contaminated kaolinite clay specimen and the influence of voltage, current intensity, moisture content, pH, and facilitating agents on metal removal and energy consumption. The objective of this study is to identify the influence of the typical variables used in Electrokinetic remediation. The results showed that the operation at constant voltage or constant current intensity were equivalent in terms of metal removal and energy consumption, as long as the electric field intensity was kept low to minimize the consumption in parallel electrochemical reactions, especially the electrolysis of water. The moisture content had a significant influence on the Mn removal. Moisture content higher that 50 percent resulted in very effective Mn removal as compared with kaolinite specimens with lower moisture. The control of pH in the electrolyte solutions and the addition of facilitating agents (organic acids) enhanced the removal of Mn but increased the electric energy cost. Overall, the best conditions for Mn removal involved low to moderate electric potential difference (10 to 30 V), the use of citric acid as the facilitating agent, and the pH control in the cathode at a slightly acid pH. The Electrokinetic Treatment of a sludge from a water Treatment plant contaminated with Mn was effective when pH control on the cathode was used. Mn and various metals (66% of Mn, 30% of Cu, 56% of Zn, 21% Sr, and 21% of Fe) were removed with moderate electricity and acid consumption.

  • Opportunities of Electrokinetics for the remediation of mining sites in Biga peninsula, Turkey.
    Chemosphere, 2019
    Co-Authors: Oznur Karaca, Claudio Cameselle, Mustafa Bozcu
    Abstract:

    This study investigated the geological conditions of Biga Peninsula. There are metamorphic rocks, ophiolitic melange, plutonic rocks, subvolcanics, volcanic rocks and volcanoclastics along with marine and terrestrial sediments in the region. This variety of rocks and the associated minerals resulted in many interesting metallic ores and coal for commercial exploitation. The mining exploitations in Biga Peninsula (Turkey) pose an environmental risk due to the release of contaminants, metals and arsenic, to the soil and waterbodies. This study analyzed the potential release of As and metals (Al, Fe, Mn) from a sediment sampled in a mine pond. The extraction column tests proved that those contaminants can be dissolved from the sediment using deionized water as eluent. The Electrokinetic Treatment of the sediment was able to remove Al and Mn, but the removal of Fe and As was negligible. The fractionation of As and metals in the sediment confirmed that the Electrokinetic Treatment was able to mobilize the contaminants. Based on the results of this study, it has been hypothesized that the toxic elements could be removed by Electrokinetics using facilitating agents, neutralizing the alkaline environment of the cathode and increasing the Treatment time.

  • Electrokinetic Treatment of an agricultural soil contaminated with heavy metals.
    Journal of environmental science and health. Part A Toxic hazardous substances & environmental engineering, 2016
    Co-Authors: Arylein Figueroa, Claudio Cameselle, Susana Gouveia, Henrik K. Hansen
    Abstract:

    The high organic matter content in agricultural soils tends to complex and retain contaminants such as heavy metals. Electrokinetic remediation was tested in an agricultural soil contaminated with Co(+2), Zn(+2), Cd(+2), Cu(+2), Cr(VI), Pb(+2) and Hg(+2). The unenhanced Electrokinetic Treatment was not able to remove heavy metals from the soil due to the formation of precipitates in the alkaline environment in the soil section close to the cathode. Moreover, the interaction between metals and organic matter probably limited metal transportation under the effect of the electric field. Citric acid and ethylenediaminetetraacetic acid (EDTA) were used in the catholyte as complexing agents in order to enhance the extractability and removal of heavy metals from soil. These complexing agents formed negatively charged complexes that migrated towards the anode. The acid front electrogenerated at the anode favored the dissolution of heavy metals that were transported towards the cathode. The combined effect of the soil pH and the complexing agents resulted in the accumulation of heavy metals in the center of the soil specimen.

  • Electrokinetic Treatment of an agricultural soil contaminated with heavy metals Part A Toxic/hazardous substances & environmental engineering
    2016
    Co-Authors: Arylein Figueroa, Claudio Cameselle, Susana Gouveia, Henrik K. Hansen
    Abstract:

    The high organic matter content in agricultural soils tends to complex and retain contaminants such as heavy metals. Electrokinetic remediation was tested in an agricultural soil contaminated with Co ⁺², Zn ⁺², Cd ⁺², Cu ⁺², Cr(VI), Pb ⁺² and Hg ⁺². The unenhanced Electrokinetic Treatment was not able to remove heavy metals from the soil due to the formation of precipitates in the alkaline environment in the soil section close to the cathode. Moreover, the interaction between metals and organic matter probably limited metal transportation under the effect of the electric field. Citric acid and ethylenediaminetetraacetic acid (EDTA) were used in the catholyte as complexing agents in order to enhance the extractability and removal of heavy metals from soil. These complexing agents formed negatively charged complexes that migrated towards the anode. The acid front electrogenerated at the anode favored the dissolution of heavy metals that were transported towards the cathode. The combined effect of the soil pH and the complexing agents resulted in the accumulation of heavy metals in the center of the soil specimen.

  • Enhancement of Electro-Osmotic Flow during the Electrokinetic Treatment of A Contaminated Soil
    Electrochimica Acta, 2015
    Co-Authors: Claudio Cameselle
    Abstract:

    The Electrokinetic remediation of contaminated soils relies in two main transport mechanisms: electromigration and electro-osmosis. The electro-osmotic flow depends on fluid characteristics (dielectric constant and viscosity) and soil surface characteristics represented by Z-potential, as well as voltage gradient. In this work, the influence of voltage gradient in the development and maintenance of electro-osmotic flow is studied. The voltage gradient directly affected the electro-osmotic flow but it also affected the geochemistry of soil that had a critical effect on electro-osmosis. It was demonstrated that 1 V/cm resulted in the development and maintenance of a large electro-osmotic flow. The use of organic acids, such as citric acid, induced large electro-osmotic flow due to the interaction of the organic acids with the soil particles. The use of citric acid was considered to be very promising for large-scale operation.

Khairul Anuar Kassim - One of the best experts on this subject based on the ideXlab platform.

  • Electrokinetic Treatment on a tropical residual soil
    Proceedings of the Institution of Civil Engineers - Forensic Engineering, 2011
    Co-Authors: Kamarudin Ahmad, Mohd Raihan Taha, Khairul Anuar Kassim
    Abstract:

    Established in 1985, the technical council on forensic engineering of the American Society of Civil Engineers (ASCE) conducts an extensive number of projects aimed at disseminating lessons learned from civil engineering failures. The goal is to reduce the frequency and severity of performance deficiencies by influencing improvements in design and construction practices. The activities and projects of the technical council have contributed to a better understanding of the role of forensic engineering in the USA, enhancing both the image and the influence of forensic engineering practice. This brief article summarises the work of the technical council and extends a warm welcome to Forensic Engineering.

  • Electrokinetic Treatment on a tropical residual soil
    Proceedings of the Institution of Civil Engineers - Ground Improvement, 2011
    Co-Authors: Kamarudin Ahmad, Mohd Raihan Taha, Khairul Anuar Kassim
    Abstract:

    The results of shear box and consolidation tests on Electrokinetically-treated tropical residual soil are presented. Injections of selected chemicals (calcium chloride, aluminium chloride and phosphoric acid) into the soil samples at the anodes or cathodes were carried out in cylindrical Electrokinetic cells via applications of 30 V DC electrical potential for 168 h. Four different open-anode and open-cathode Electrokinetic systems utilising different anolytes and catholytes were employed to treat the soil samples. The shear resistances of the treated soil utilising distilled water as the anolyte and 1·0 mol/l phosphoric acid as the catholyte was enhanced, whereas the treated soil near the cathode showed significant reduction in compressibility. Soil treated utilising the other chemicals showed no significant changes.