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Article

Anodic Oxidation of Industrial Winery Wastewater Using Different Anodes

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Laboratorio de Biotecnología Ambiental, Facultad de Ingeniería, Universidad de Santiago de Chile, Ave. Libertador Bernardo O’Higgins 3363, Santiago de Chile 9160000, Chile
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Laboratorio de Electroquímica del Medio Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago de Chile 9160000, Chile
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Centro de Investigación de Procesos Redox (CIPREx), Laboratorio Biosensores, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago de Chile 9160000, Chile
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Laboratorio de Microbiología, Facultad Tecnológica, Universidad de Santiago de Chile, Santiago de Chile 9160000, Chile
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Author to whom correspondence should be addressed.
Academic Editor: Chengyun Zhou
Water 2022, 14(1), 95; https://doi.org/10.3390/w14010095
Received: 21 October 2021 / Revised: 14 December 2021 / Accepted: 29 December 2021 / Published: 4 January 2022
(This article belongs to the Special Issue Advanced Electrochemical Technologies for Water Treatment)
Winery wastewater represents the largest waste stream in the wine industry. This deals with the mineralization of the organic matter present in winery wastewater using anodic oxidation and two types of anodes—namely, a boron-doped diamond electrode (BDD) and two mixed metal oxides (MMO), one with the nominal composition Ti/Ru0.3Ti0.7O2 and the other with Ti/Ir0.45Ta0.55O2. To conduct the study, the variability of different quality parameters for winery wastewater from the Chilean industry was measured during eight months. A composite sample was treated using anodic oxidation without the addition of supporting electrolyte, and the experiments were conducted at the natural pH of the industrial wastewater. The results show that this effluent has a high content of organic matter (up to 3025 ± 19 mg/L of total organic carbon (TOC)), which depends on the time of the year and the level of wine production. With MMO electrodes, TOC decreased by 2.52% on average after 540 min, which may be attributed to the presence of intermediate species that could not be mineralized. However, when using a BDD electrode, 85% mineralization was achieved due to the higher generation of hydroxyl radicals. The electrolyzed sample contained oxamic, acetic, and propionic acid as well as different ions such as sulfate, chloride, nitrate, and phosphate. These ions can contribute to the formation of different species such as active species of chlorine, persulfate, and perphosphate, which can improve the oxidative power of the system. View Full-Text
Keywords: winery wastewater; anodic oxidation; BDD and MMO electrodes; hydroxyl radicals; ions winery wastewater; anodic oxidation; BDD and MMO electrodes; hydroxyl radicals; ions
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MDPI and ACS Style

Lauzurique, Y.; Espinoza, L.C.; Huiliñir, C.; García, V.; Salazar, R. Anodic Oxidation of Industrial Winery Wastewater Using Different Anodes. Water 2022, 14, 95. https://doi.org/10.3390/w14010095

AMA Style

Lauzurique Y, Espinoza LC, Huiliñir C, García V, Salazar R. Anodic Oxidation of Industrial Winery Wastewater Using Different Anodes. Water. 2022; 14(1):95. https://doi.org/10.3390/w14010095

Chicago/Turabian Style

Lauzurique, Yeney, Lidia C. Espinoza, César Huiliñir, Verónica García, and Ricardo Salazar. 2022. "Anodic Oxidation of Industrial Winery Wastewater Using Different Anodes" Water 14, no. 1: 95. https://doi.org/10.3390/w14010095

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