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Electrochemical process for the treatment of landfill leachate

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Abstract

In this paper, the anodic oxidation of a real leachate from an old municipal solid waste landfill has been studied using an electrolytic flow cell equipped with a lead dioxide (PbO2) anode and stainless steel as the cathode. The influence of several operation parameters such as (i) the applied current (from 0.5 to 3 A), (ii) liquid flow rate (from 50 to 420 L h−1), (iii) temperature (from 25 to 50 °C), and (iv) pH (from 3.5 to 8.2) on the COD removal rate, current efficiency, and energy consumption has been evaluated. The galvanostatic electrolyses always yielded COD values below the discharge limit (COD <160 mg L−1); the COD removal rate increased with rising applied current, solution pH, and temperature, whereas it remained almost unaffected by the recirculation flow rate. These results indicate that the organic compounds were mainly removed by their indirect oxidation by the active chlorine generated from chlorides oxidation. The specific energy consumption necessary to reduce the organic load to below the disposal limit was 90 kWh m−3.

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Acknowledgments

I.S. acknowledges the support from the members of the Laboratorio di Elettrochimica, Corrosione e Protezione dei Materiali Metallici of the Università degli Studi di Genova to draw up this paper.

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Authors and Affiliations

  1. Department of Chemical and Process Engineering, P.le J.F. Kennedy 1, 16129, Genoa, Italy

    Marco Panizza & Marina Delucchi

  2. Laboratori d’Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain

    Ignasi Sirés

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  1. Marco Panizza
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  2. Marina Delucchi
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  3. Ignasi Sirés
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Correspondence to Marco Panizza.

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Panizza, M., Delucchi, M. & Sirés, I. Electrochemical process for the treatment of landfill leachate. J Appl Electrochem 40, 1721–1727 (2010). https://doi.org/10.1007/s10800-010-0109-7

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  • DOI: https://doi.org/10.1007/s10800-010-0109-7

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