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Title: Assessment of IrO2-Ta2O5|Ti electrodes for the electrokinetic treatment of hydrocarbon-contaminated soil using different electrode arrays
Author: Cuevas, Oswaldo
Herrada García, Rosa Alhelí
Corona, Jorge L.
Olvera, María G.
Sepúlveda-Guzmán, Selene
Sirés Sadornil, Ignacio
Bustos, Enric
Keywords: Elèctrodes
Descontaminació dels sòls
Soil remediation
Issue Date: 1-Aug-2016
Publisher: Elsevier Ltd
Abstract: In recent years, physicochemical processes such as the electrokinetic treatment (EKT) have gained acceptance as suitable alternatives to restore hydrocarbon (HC)-contaminated sites. EKT entails relatively short times, moderate operation costs and high removal efficiencies, being usually applied in heterogeneous soils with low permeability. In this work, 1D and 2D configurations, which require one sole pair of electrodes (facing each other) or six anodes around a central cathode (radial array), respectively, have been tested by employing Ti cathodes and anodes, as well as purpose-made IrO2-Ta2O5|Ti as dimensionally-stable anodes (DSA). The electrodes were partially introduced into a real Vertisol soil contaminated with heavy and intermediate fractions of HC. The distance between the cathode and each anode was of 6 cm at laboratory scale employing a 276 cm3 container with 2.2 kg of polluted soil and a 115 cm3 container with 87.8 g of polluted soil for the 2D and 1D arrays, respectively. 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 better, reaching 58% HC removal near the anode applying 30 V and an electric field of 2.4 A cm-1. The effect of the treatment on the morphology of the anodes has been analyzed by SEM-EDX.
Note: Versió postprint del document publicat a:
It is part of: Electrochimica Acta, 2016, vol. 208, p. 282-287
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ISSN: 0013-4686
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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