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Olena Stabnikova - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous removal of organic contaminants and heavy metals from kaolin using an upward electrokinetic soil remediation process
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Olena Stabnikova
    Abstract:

    Abstract Kaolins contaminated with heavy metals, Cu and Pb, and organic compounds, p-xylene and phenanthrene, were treated with an upward electrokinetic soil remediation (UESR) process. The effects of current density, Cathode Chamber flushing fluid, treatment duration, reactor size, and the type of contaminants under the vertical non-uniform electric field of UESR on the simultaneous removal of the heavy metals and organic contaminants were studied. The removal efficiencies of p-xylene and phenanthrene were higher in the experiments with cells of smaller diameter or larger height, and with distilled water flow in the Cathode Chamber. The removal efficiency of Cu and Pb were higher in the experiments with smaller diameter or shorter height cells and 0.01 M HNO3 solution as Cathode Chamber flow. In spite of different conditions for removal of heavy metals and organics, it is possible to use the upward electrokinetic soil remediation process for their simultaneous removal. Thus, in the experiments with duration of 6 days removal efficiencies of phenanthrene, p-xylene, Cu and Pb were 67%, 93%, 62% and 35%, respectively. The experiment demonstrated the feasibility of simultaneous removal of organic contaminants and heavy metals from kaolin using the upward electrokinetic soil remediation process.

  • Removal of heavy metals from kaolin using an upward electrokinetic soil remedial (UESR) technology.
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Olena Stabnikova
    Abstract:

    Abstract An upward electrokinetic soil remedial (UESR) technology was proposed to remove heavy metals from contaminated kaolin. Unlike conventional electrokinetic treatment that uses boreholes or trenches for horizontal migration of heavy metals, the UESR technology, applying vertical non-uniform electric fields, caused upward transportation of heavy metals to the top surface of the treated soil. The effects of current density, treatment duration, cell diameter, and different Cathode Chamber influent (distilled water or 0.01 M nitric acid) were studied. The removal efficiencies of heavy metals positively correlated to current density and treatment duration. Higher heavy metals removal efficiency was observed for the reactor cell with smaller diameter. A substantial amount of heavy metals was accumulated in the nearest to Cathode 2 cm layer of kaolin when distilled water was continuously supplied to the Cathode Chamber. Heavy metals accumulated in this layer of kaolin can be easily excavated and disposed off. The main part of the removed heavy metals was dissolved in Cathode Chamber influent and moved away with Cathode Chamber effluent when 0.01 M nitric acid was used, instead of distilled water. Energy saving treatment by UESR technology with highest metal removal efficiencies was provided by two regimes: (1) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 mm, duration of 18 days, and constant voltage of 3.5 V (19.7 kWh/m3 of kaolin) and (2) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 cm, duration of 6 days, and constant current density of 0.191 mA/cm2 (19.1 kWh/m3 of kaolin).

  • Removal of heavy metals from kaolin using an upward electrokinetic soil remedial (UESR) technology
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Jimmy C M Kao, Olena Stabnikova
    Abstract:

    An upward electrokinetic soil remedial (UESR) technology was proposed to remove heavy metals from contaminated kaolin. Unlike conventional electrokinetic treatment that uses boreholes or trenches for horizontal migration of heavy metals, the UESR technology, applying vertical non-uniform electric fields, caused upward transportation of heavy metals to the top surface of the treated soil. The effects of current density, treatment duration, cell diameter, and different Cathode Chamber influent (distilled water or 0.01 M nitric acid) were studied. The removal efficiencies of heavy metals positively correlated to current density and treatment duration. Higher heavy metals removal efficiency was observed for the reactor cell with smaller diameter. A substantial amount of heavy metals was accumulated in the nearest to Cathode 2 cm layer of kaolin when distilled water was continuously supplied to the Cathode Chamber. Heavy metals accumulated in this layer of kaolin can be easily excavated and disposed off. The main part of the removed heavy metals was dissolved in Cathode Chamber influent and moved away with Cathode Chamber effluent when 0.01 M nitric acid was used, instead of distilled water. Energy saving treatment by UESR technology with highest metal removal efficiencies was provided by two regimes: (1) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 mm, duration of 18 days, and constant voltage of 3.5 V (19.7 kWh/m3of kaolin) and (2) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 cm, duration of 6 days, and constant current density of 0.191 mA/cm2(19.1 kWh/m3of kaolin). © 2006 Elsevier B.V. All rights reserved.

  • Evaluation of electrokinetic removal of heavy metals from sewage sludge.
    Journal of hazardous materials, 2005
    Co-Authors: Jing-yuan Wang, Di-song Zhang, Olena Stabnikova
    Abstract:

    The presence of heavy metals is one of the main obstacles for agricultural use of million tonnes of dewatered sewage sludge produced in wastewater treatment plants. Electrokinetic (EK) treatment can be applied to remove heavy metals from sludge. The aim of this study was to increase the efficiency of electrokinetic removal of heavy metals from dewatered sewage sludge. EK experiments were carried out with and without pH adjustment in Cathode Chamber of acidified sewage sludge. The selective sequential extraction (SSE) was used to determine the fractionation of heavy metals in sewage sludge. The mobility of heavy metals in sludge significantly increased after its acidification at pH 2.7 and followed the order: Ni, Zn, Cu, As, Cr, Pb. Removal efficiencies of heavy metals in the experiment with acidified sewage sludge and pH adjustment at Cathode Chamber at 2.0 were: 95% for Zn, 96% for Cu, 90% for Ni, 68% for Cr, 31% for As and 19% for Pb. The concentrations of Zn, Cu, Ni, Cr and Pb after EK treatment were below the United States Environmental Protection Agency limits for biosolids applied to agricultural land, forest, public contact sites or reclamation sites.

Jing-yuan Wang - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous removal of organic contaminants and heavy metals from kaolin using an upward electrokinetic soil remediation process
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Olena Stabnikova
    Abstract:

    Abstract Kaolins contaminated with heavy metals, Cu and Pb, and organic compounds, p-xylene and phenanthrene, were treated with an upward electrokinetic soil remediation (UESR) process. The effects of current density, Cathode Chamber flushing fluid, treatment duration, reactor size, and the type of contaminants under the vertical non-uniform electric field of UESR on the simultaneous removal of the heavy metals and organic contaminants were studied. The removal efficiencies of p-xylene and phenanthrene were higher in the experiments with cells of smaller diameter or larger height, and with distilled water flow in the Cathode Chamber. The removal efficiency of Cu and Pb were higher in the experiments with smaller diameter or shorter height cells and 0.01 M HNO3 solution as Cathode Chamber flow. In spite of different conditions for removal of heavy metals and organics, it is possible to use the upward electrokinetic soil remediation process for their simultaneous removal. Thus, in the experiments with duration of 6 days removal efficiencies of phenanthrene, p-xylene, Cu and Pb were 67%, 93%, 62% and 35%, respectively. The experiment demonstrated the feasibility of simultaneous removal of organic contaminants and heavy metals from kaolin using the upward electrokinetic soil remediation process.

  • Removal of heavy metals from kaolin using an upward electrokinetic soil remedial (UESR) technology.
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Olena Stabnikova
    Abstract:

    Abstract An upward electrokinetic soil remedial (UESR) technology was proposed to remove heavy metals from contaminated kaolin. Unlike conventional electrokinetic treatment that uses boreholes or trenches for horizontal migration of heavy metals, the UESR technology, applying vertical non-uniform electric fields, caused upward transportation of heavy metals to the top surface of the treated soil. The effects of current density, treatment duration, cell diameter, and different Cathode Chamber influent (distilled water or 0.01 M nitric acid) were studied. The removal efficiencies of heavy metals positively correlated to current density and treatment duration. Higher heavy metals removal efficiency was observed for the reactor cell with smaller diameter. A substantial amount of heavy metals was accumulated in the nearest to Cathode 2 cm layer of kaolin when distilled water was continuously supplied to the Cathode Chamber. Heavy metals accumulated in this layer of kaolin can be easily excavated and disposed off. The main part of the removed heavy metals was dissolved in Cathode Chamber influent and moved away with Cathode Chamber effluent when 0.01 M nitric acid was used, instead of distilled water. Energy saving treatment by UESR technology with highest metal removal efficiencies was provided by two regimes: (1) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 mm, duration of 18 days, and constant voltage of 3.5 V (19.7 kWh/m3 of kaolin) and (2) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 cm, duration of 6 days, and constant current density of 0.191 mA/cm2 (19.1 kWh/m3 of kaolin).

  • Removal of heavy metals from kaolin using an upward electrokinetic soil remedial (UESR) technology
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Jimmy C M Kao, Olena Stabnikova
    Abstract:

    An upward electrokinetic soil remedial (UESR) technology was proposed to remove heavy metals from contaminated kaolin. Unlike conventional electrokinetic treatment that uses boreholes or trenches for horizontal migration of heavy metals, the UESR technology, applying vertical non-uniform electric fields, caused upward transportation of heavy metals to the top surface of the treated soil. The effects of current density, treatment duration, cell diameter, and different Cathode Chamber influent (distilled water or 0.01 M nitric acid) were studied. The removal efficiencies of heavy metals positively correlated to current density and treatment duration. Higher heavy metals removal efficiency was observed for the reactor cell with smaller diameter. A substantial amount of heavy metals was accumulated in the nearest to Cathode 2 cm layer of kaolin when distilled water was continuously supplied to the Cathode Chamber. Heavy metals accumulated in this layer of kaolin can be easily excavated and disposed off. The main part of the removed heavy metals was dissolved in Cathode Chamber influent and moved away with Cathode Chamber effluent when 0.01 M nitric acid was used, instead of distilled water. Energy saving treatment by UESR technology with highest metal removal efficiencies was provided by two regimes: (1) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 mm, duration of 18 days, and constant voltage of 3.5 V (19.7 kWh/m3of kaolin) and (2) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 cm, duration of 6 days, and constant current density of 0.191 mA/cm2(19.1 kWh/m3of kaolin). © 2006 Elsevier B.V. All rights reserved.

  • Evaluation of electrokinetic removal of heavy metals from sewage sludge.
    Journal of hazardous materials, 2005
    Co-Authors: Jing-yuan Wang, Di-song Zhang, Olena Stabnikova
    Abstract:

    The presence of heavy metals is one of the main obstacles for agricultural use of million tonnes of dewatered sewage sludge produced in wastewater treatment plants. Electrokinetic (EK) treatment can be applied to remove heavy metals from sludge. The aim of this study was to increase the efficiency of electrokinetic removal of heavy metals from dewatered sewage sludge. EK experiments were carried out with and without pH adjustment in Cathode Chamber of acidified sewage sludge. The selective sequential extraction (SSE) was used to determine the fractionation of heavy metals in sewage sludge. The mobility of heavy metals in sludge significantly increased after its acidification at pH 2.7 and followed the order: Ni, Zn, Cu, As, Cr, Pb. Removal efficiencies of heavy metals in the experiment with acidified sewage sludge and pH adjustment at Cathode Chamber at 2.0 were: 95% for Zn, 96% for Cu, 90% for Ni, 68% for Cr, 31% for As and 19% for Pb. The concentrations of Zn, Cu, Ni, Cr and Pb after EK treatment were below the United States Environmental Protection Agency limits for biosolids applied to agricultural land, forest, public contact sites or reclamation sites.

Xiang Jun Huang - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous removal of organic contaminants and heavy metals from kaolin using an upward electrokinetic soil remediation process
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Olena Stabnikova
    Abstract:

    Abstract Kaolins contaminated with heavy metals, Cu and Pb, and organic compounds, p-xylene and phenanthrene, were treated with an upward electrokinetic soil remediation (UESR) process. The effects of current density, Cathode Chamber flushing fluid, treatment duration, reactor size, and the type of contaminants under the vertical non-uniform electric field of UESR on the simultaneous removal of the heavy metals and organic contaminants were studied. The removal efficiencies of p-xylene and phenanthrene were higher in the experiments with cells of smaller diameter or larger height, and with distilled water flow in the Cathode Chamber. The removal efficiency of Cu and Pb were higher in the experiments with smaller diameter or shorter height cells and 0.01 M HNO3 solution as Cathode Chamber flow. In spite of different conditions for removal of heavy metals and organics, it is possible to use the upward electrokinetic soil remediation process for their simultaneous removal. Thus, in the experiments with duration of 6 days removal efficiencies of phenanthrene, p-xylene, Cu and Pb were 67%, 93%, 62% and 35%, respectively. The experiment demonstrated the feasibility of simultaneous removal of organic contaminants and heavy metals from kaolin using the upward electrokinetic soil remediation process.

  • Removal of heavy metals from kaolin using an upward electrokinetic soil remedial (UESR) technology.
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Olena Stabnikova
    Abstract:

    Abstract An upward electrokinetic soil remedial (UESR) technology was proposed to remove heavy metals from contaminated kaolin. Unlike conventional electrokinetic treatment that uses boreholes or trenches for horizontal migration of heavy metals, the UESR technology, applying vertical non-uniform electric fields, caused upward transportation of heavy metals to the top surface of the treated soil. The effects of current density, treatment duration, cell diameter, and different Cathode Chamber influent (distilled water or 0.01 M nitric acid) were studied. The removal efficiencies of heavy metals positively correlated to current density and treatment duration. Higher heavy metals removal efficiency was observed for the reactor cell with smaller diameter. A substantial amount of heavy metals was accumulated in the nearest to Cathode 2 cm layer of kaolin when distilled water was continuously supplied to the Cathode Chamber. Heavy metals accumulated in this layer of kaolin can be easily excavated and disposed off. The main part of the removed heavy metals was dissolved in Cathode Chamber influent and moved away with Cathode Chamber effluent when 0.01 M nitric acid was used, instead of distilled water. Energy saving treatment by UESR technology with highest metal removal efficiencies was provided by two regimes: (1) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 mm, duration of 18 days, and constant voltage of 3.5 V (19.7 kWh/m3 of kaolin) and (2) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 cm, duration of 6 days, and constant current density of 0.191 mA/cm2 (19.1 kWh/m3 of kaolin).

  • Removal of heavy metals from kaolin using an upward electrokinetic soil remedial (UESR) technology
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Jimmy C M Kao, Olena Stabnikova
    Abstract:

    An upward electrokinetic soil remedial (UESR) technology was proposed to remove heavy metals from contaminated kaolin. Unlike conventional electrokinetic treatment that uses boreholes or trenches for horizontal migration of heavy metals, the UESR technology, applying vertical non-uniform electric fields, caused upward transportation of heavy metals to the top surface of the treated soil. The effects of current density, treatment duration, cell diameter, and different Cathode Chamber influent (distilled water or 0.01 M nitric acid) were studied. The removal efficiencies of heavy metals positively correlated to current density and treatment duration. Higher heavy metals removal efficiency was observed for the reactor cell with smaller diameter. A substantial amount of heavy metals was accumulated in the nearest to Cathode 2 cm layer of kaolin when distilled water was continuously supplied to the Cathode Chamber. Heavy metals accumulated in this layer of kaolin can be easily excavated and disposed off. The main part of the removed heavy metals was dissolved in Cathode Chamber influent and moved away with Cathode Chamber effluent when 0.01 M nitric acid was used, instead of distilled water. Energy saving treatment by UESR technology with highest metal removal efficiencies was provided by two regimes: (1) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 mm, duration of 18 days, and constant voltage of 3.5 V (19.7 kWh/m3of kaolin) and (2) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 cm, duration of 6 days, and constant current density of 0.191 mA/cm2(19.1 kWh/m3of kaolin). © 2006 Elsevier B.V. All rights reserved.

Jimmy C M Kao - One of the best experts on this subject based on the ideXlab platform.

  • Removal of heavy metals from kaolin using an upward electrokinetic soil remedial (UESR) technology
    Journal of Hazardous Materials, 2006
    Co-Authors: Jing-yuan Wang, Xiang Jun Huang, Jimmy C M Kao, Olena Stabnikova
    Abstract:

    An upward electrokinetic soil remedial (UESR) technology was proposed to remove heavy metals from contaminated kaolin. Unlike conventional electrokinetic treatment that uses boreholes or trenches for horizontal migration of heavy metals, the UESR technology, applying vertical non-uniform electric fields, caused upward transportation of heavy metals to the top surface of the treated soil. The effects of current density, treatment duration, cell diameter, and different Cathode Chamber influent (distilled water or 0.01 M nitric acid) were studied. The removal efficiencies of heavy metals positively correlated to current density and treatment duration. Higher heavy metals removal efficiency was observed for the reactor cell with smaller diameter. A substantial amount of heavy metals was accumulated in the nearest to Cathode 2 cm layer of kaolin when distilled water was continuously supplied to the Cathode Chamber. Heavy metals accumulated in this layer of kaolin can be easily excavated and disposed off. The main part of the removed heavy metals was dissolved in Cathode Chamber influent and moved away with Cathode Chamber effluent when 0.01 M nitric acid was used, instead of distilled water. Energy saving treatment by UESR technology with highest metal removal efficiencies was provided by two regimes: (1) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 mm, duration of 18 days, and constant voltage of 3.5 V (19.7 kWh/m3of kaolin) and (2) by application of 0.01 M nitric acid as Cathode Chamber influent, cell diameter of 100 cm, duration of 6 days, and constant current density of 0.191 mA/cm2(19.1 kWh/m3of kaolin). © 2006 Elsevier B.V. All rights reserved.

M. Ángeles Sanromán - One of the best experts on this subject based on the ideXlab platform.

  • Removal of PAHs and pesticides from polluted soils by enhanced electrokinetic-Fenton treatment
    Chemosphere, 2015
    Co-Authors: Elvira Bocos, Manuel Pazos, Carmen Fernández-costas, M. Ángeles Sanromán
    Abstract:

    Abstract In this study, electrokinetic-Fenton treatment was used to remediate a soil polluted with PAHs and the pesticide pyrimethanil. Recently, this treatment has emerged as an interesting alternative to conventional soil treatments due to its peculiar advantages, namely the capability of treating fine and low-permeability materials, as well as that of achieving a high yield in the removals of salt content and inorganic and organic pollutants. In a standard electrokinetic-Fenton treatment, the maximum degradation of the pollutant load achieved was 67%, due to the precipitation of the metals near the Cathode Chamber that reduces the electro-osmotic flow of the system and thus the efficiency of the treatment. To overcome this problem, different complexing agents and pH control in the Cathode Chamber were evaluated to increase the electro-osmotic flux as well as to render easier the solubilization of the metal species present in the soil. Four complexing agents (ascorbic acid, citric acid, oxalic acid and ethylenediaminetetraacetic acid) in the Fenton-like treatment were evaluated. Results revealed the citric acid as the most suitable complexing agent. Thereby its efficiency was tested as pH controller by flushing it in the Cathode Chamber (pH 2 and 5). For the latter treatments, near total degradation was achieved after 27 d. Finally, phytotoxicity tests for polluted and treated samples were carried out. The high germination levels of the soil treated under enhanced conditions concluded that nearly complete restoration was achieved.

  • Electrochemical remediation of phenanthrene from contaminated kaolinite
    Environmental Geochemistry and Health, 2008
    Co-Authors: T. Alcántara, Claudio Cameselle, Manuel Pazos, M. Ángeles Sanromán
    Abstract:

    In this work a two-stage process combining soil electrokinetic remediation and liquid electrochemical oxidation for the remediation of polluted soil with organic compounds has been developed and evaluated using phenanthrene-spiked kaolinite. Application of an unenhanced electrokinetic process resulted in negligible removal of phenanthrene from the kaolinite sample. Addition of co-solvents and electrolyte to the processing fluid used in the electrode Chambers enhanced phenanthrene desorption from the kaolinite matrix and favoured electro-osmotic flow. Near-complete removal of phenanthrene was achieved using Na_2SO_4 and ethanol in the processing fluid. Phenanthrene was transported towards the Cathode Chamber where it was collected. The cathodic solution containing the pollutant was treated by electrochemical oxidation; complete degradation of phenanthrene occurred after 9 h using Na_2SO_4 as electrolyte.