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Treatment of cheese whey wastewater by combined electrochemical processes

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Abstract

This study shows the good performance of a sequential electrochemical methodology, consisting in electrocoagulation (EC) followed by an electrochemical advanced oxidation process (EAOP), to treat raw cheese whey wastewater at laboratory and pre-pilot scales. In EC, different electrode materials like Fe, Al and stainless steel (AISI 304 and ASI 316L) were tested. Among EAOPs, photoelectro-Fenton (PEF) and electrochemical oxidation (EO) with active anodes like Pt or DSA® and non-active ones like boron-doped diamond (BDD) were studied. At both scales, the optimum anode/cathode combination in EC was Fe/AISI 304, which yielded the highest total organic carbon (TOC) removal of 22.0–27.0%. This is due to various effects on organic compounds: (i) coagulation promoted by Fe(OH)3 flocs, (ii) cathodic reduction, and (iii) oxidation with generated active chlorine. At small scale, the resulting wastewater was further treated by PEF at pH 3.0. The highest TOC removal was achieved using the BDD, owing to the great oxidation power of hydroxyl radicals. In contrast, total nitrogen was abated much more rapidly with active anodes because of the attack of active chlorine on N-compounds. At pre-pilot scale, the post-treatment of conditioned wastewater made by EO with a BDD/Pt flow cell combined with UVA irradiation yielded the highest TOC removal, i.e., 49.1%. The high energy consumed by the UVA lamp would be a drawback at industrial scale, which could be overcome by using sunlight.

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Acknowledgements

The authors acknowledge financial support from project CTQ2016-78616-R (AEI/FEDER, EU). Dr. Ömür Gökkuş would like to thank for the support to the Scientific and Technological Research Council of Turkey (TUBITAK) 2219 - International Post-Doctoral Research Fellowship Programme (Grant Number 1059B191601343).

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Correspondence to Ignasi Sirés.

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Tirado, L., Gökkuş, Ö., Brillas, E. et al. Treatment of cheese whey wastewater by combined electrochemical processes. J Appl Electrochem 48, 1307–1319 (2018). https://doi.org/10.1007/s10800-018-1218-y

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  • DOI: https://doi.org/10.1007/s10800-018-1218-y

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