Electrochemical remediation of phenanthrene from contaminated kaolinite |
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Authors: | T Alcántara M Pazos C Cameselle M A Sanromán |
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Institution: | (1) Department of Chemical Engineering, University of Vigo, 36310 Vigo, Spain |
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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 Na2SO4 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 Na2SO4 as electrolyte. |
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Keywords: | Electrochemical oxidation Electrokinetic PAHs Phenanthrene Soil remediation |
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