Abstract
The aim of this work was to evaluate the pollutant load from tannery effluents treated by chemical coagulation (CC) followed by electro-oxidation (EO), performed in two different experimental batch-recirculated setups, one with a BDD anode and the other with Ti/Pt/PbO2 and Ti/Pt/SnO2-Sb2O4 anodes (PS). Results were compared with those obtained from EO of the raw sample. CC was performed with a Fe3+ concentration of 0.25 g L−1, and the applied current densities for EO in each setup were 60 mA cm−2 for BDD and, in the PS setup, 20 and 40 mA cm−2 for Ti/Pt/SnO2-Sb2O4 and Ti/Pt/PbO2, respectively. During CC, removals of 27% in chemical oxygen demand (COD), 14% in total nitrogen, 100% in sulfide, and 73% in Cr(VI) were observed. COD removal in the EO of the raw sample was higher than that obtained for the combined CC + EO, for both setups, showing that the organic compounds removed by CC are mainly those that would be more easily removed by EO. For most of the other parameters related with carbon and nitrogen, the removals for CC + EO were higher than for EO alone. During EO, sulfide is converted to sulfate, especially with BDD. Concerning Cr(VI) concentration, it increases during EO, in particular for PS setup. Combined treatment, with both setups, proved to be an effective choice to treat tannery effluents.
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Relevant data generated or analyzed during this study are included in this published article. Additional datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was funded by Fundação para a Ciência e a Tecnologia, FCT, through the funding of the UID Fiber Materials and Environmental Technologies (FibEnTech-UBI), projects PEst-OE/CTM/UI0195/2013 and UIDB/00195/2020. This work was also supported by Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior, CAPES, for the financing of the Ph.D. Grant (Bolsista da CAPES – Proc. n° BEX 0714/13-5).
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PCC: investigation, writing—original draft, visualization, project administration. MJP: methodology, validation, investigation, writing—review and editing. LC: resources, writing—review and editing, Visualization. AL: conceptualization, writing—review and editing, supervision.
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Caliari, P.C., Pacheco, M.J., Ciríaco, L. et al. Treatment of tannery effluent by chemical coagulation combined with batch-recirculated electro-oxidation at different anode materials. Environ Sci Pollut Res 28, 24138–24149 (2021). https://doi.org/10.1007/s11356-021-12436-5
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DOI: https://doi.org/10.1007/s11356-021-12436-5