Abstract
The indigo blue dye is widely used in the textile industry, specifically in jeans dyeing, the effluents of which, rich in organic pollutants with recalcitrant characteristics, end up causing several environmental impacts, requiring efficient treatments. Several pieces of research have been conducted in search of effective treatment methods, among which is electrocoagulation. This treatment consists of an electrochemical process that generates its own coagulant by applying an electric current on metallic electrodes, bypassing the use of other chemical products. The purpose of this study was to evaluate the potential use of iron slag in the electrocoagulation of a synthetic effluent containing commercial indigo blue dye and the effluent from a textile factory. The quantified parameters were color, turbidity, pH, electrical conductivity, sludge generation, phenol removal, chemical oxygen demand (COD), and total organic carbon (TOC). The electrocoagulation treatment presented a good efficiency in removing the analyzed parameters, obtaining average removal in the synthetic effluent of 85% of color and 100% of phenol after 25 min of electrolysis. For the effluent from the textile factory, average reductions of 80% of color reaching 177.54 mg Pt CoL−1, 91% of turbidity reaching 93.83 NTU (nephelometric turbidity unit), 100% of phenol, 55% of COD with a final concentration of 298.8 mg O2 L−1, and 73% of TOC with a final concentration of 56.21 mg L−1, in 60 min of electrolysis. The reduced time for removal of color and phenolic compounds in synthetic effluent demonstrates the complexity of treating the real effluent since to obtain removals of the same order a 60-min period of electrolysis was necessary. The results obtained demonstrate the potential of using iron slag as an electrode in the electrocoagulation process in order to reuse industrial waste and reduce costs in the treatment and disposal of solid waste. Thus, the slag can be seen as an alternative material to be used in electrocoagulation processes for the treatment of effluents from the textile industry under the experimental conditions presented, its only limitation being the fact that it is a waste and therefore does not have a standardization in the amounts of iron present in the alternative electrodes.
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Federal University of Fronteira Sul (UFFS) was responsible for the laboratory area and the acquisition of reagents and equipment; Rio Grande do Sul State Research Support Foundation (FAPERGS) for the financial support (scientific initiation scholarship n ° 194/UFFS/2019).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Rafaela De Maman, Gean Delise Leal Pasquali, Vilson Conrado da Luz, Laura Behling, Clarissa Dalla Rosa, and Adriana Dervanoski. The first draft of the manuscript was written by Rafaela De Maman, Laura Behling, Vilson Conrado da Luz, and Gean Delise Leal Pasquali and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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De Maman, R., da Luz, V.C., Behling, L. et al. Electrocoagulation applied for textile wastewater oxidation using iron slag as electrodes. Environ Sci Pollut Res 29, 31713–31722 (2022). https://doi.org/10.1007/s11356-021-18456-5
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DOI: https://doi.org/10.1007/s11356-021-18456-5