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Sequential electrochemical treatment of dairy wastewater using aluminum and DSA-type anodes

  • Electrochemical advanced oxidation processes for removal of toxic/persistent organic pollutants from water
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Abstract

Dairy wastewater is characterized by a high content of hardly biodegradable dissolved, colloidal, and suspended organic matter. This work firstly investigates the performance of two individual electrochemical treatments, namely electrocoagulation (EC) and electro-oxidation (EO), in order to finally assess the mineralization ability of a sequential EC/EO process. EC with an Al anode was employed as a primary pretreatment for the conditioning of 800 mL of wastewater. A complete reduction of turbidity, as well as 90 and 81 % of chemical oxygen demand (COD) and total organic carbon (TOC) removal, respectively, were achieved after 120 min of EC at 9.09 mA cm−2. For EO, two kinds of dimensionally stable anodes (DSA) electrodes (Ti/IrO2-Ta2O5 and Ti/IrO2-SnO2–Sb2O5) were prepared by the Pechini method, obtaining homogeneous coatings with uniform composition and high roughness. The ·OH formed at the DSA surface from H2O oxidation were not detected by electron spin resonance. However, their indirect determination by means of H2O2 measurements revealed that Ti/IrO2-SnO2–Sb2O5 is able to produce partially physisorbed radicals. Since the characterization of the wastewater revealed the presence of indole derivatives, preliminary bulk electrolyses were done in ultrapure water containing 1 mM indole in sulfate and/or chloride media. The performance of EO with the Ti/IrO2-Ta2O5 anode was evaluated from the TOC removal and the UV/Vis absorbance decay. The mineralization was very poor in 0.05 M Na2SO4, whereas it increased considerably at a greater Cl− content, meaning that the oxidation mediated by electrogenerated species such as Cl2, HClO, and/or ClO− competes and even predominates over the ·OH-mediated oxidation. The EO treatment of EC-pretreated dairy wastewater allowed obtaining a global 98 % TOC removal, decreasing from 1,062 to <30 mg L−1.

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Acknowledgments

Support from CONACYT (Mexico) under program “Becas Mixtas 2012–2013 Movilidad en el extranjero”, as well as from MICINN (Spain) under project CTQ2010-16164/BQU, co-financed with FEDER funds, is acknowledged. The authors also thank the Centro de Graduados e Investigación en Química del Instituto Tecnológico de Tijuana.

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Authors and Affiliations

  1. Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Unidad Tijuana, Carretera Tijuana-Tecate km 26.6, Consorcio Tecnológico de Baja California, 22444, Tijuana, B.C., Mexico

    Brenda Borbón & Mercedes Teresita Oropeza-Guzman

  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

    Enric Brillas & Ignasi Sirés

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  1. Brenda Borbón
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  2. Mercedes Teresita Oropeza-Guzman
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  3. Enric Brillas
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  4. Ignasi Sirés
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Correspondence to Ignasi Sirés.

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Borbón, B., Oropeza-Guzman, M.T., Brillas, E. et al. Sequential electrochemical treatment of dairy wastewater using aluminum and DSA-type anodes. Environ Sci Pollut Res 21, 8573–8584 (2014). https://doi.org/10.1007/s11356-014-2787-x

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  • DOI: https://doi.org/10.1007/s11356-014-2787-x

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