Sulfaquinoxaline Oxidation and Toxicity Reduction by Photo-Fenton Process

Vanessa Ribeiro Urbano, Milena Guedes Maniero, José Roberto Guimarães, Luis J. del Valle and Montserrat Pérez-Moya
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Vanessa Ribeiro Urbano: Chemical Engineering Department, Universitat Politècnica de Catalunya, Escola d’Enginyeria de Barcelona Est (EEBE), Av. Eduard Maristany, 16, 08019 Barcelona, Spain
Milena Guedes Maniero: School of Civil Engineering, Architecture and Urban Design, FEC, University of Campinas, Unicamp, P.O. Box 6143, Campinas 13083-889, Brazil
José Roberto Guimarães: School of Civil Engineering, Architecture and Urban Design, FEC, University of Campinas, Unicamp, P.O. Box 6143, Campinas 13083-889, Brazil
Luis J. del Valle: Chemical Engineering Department, Universitat Politècnica de Catalunya, Escola d’Enginyeria de Barcelona Est (EEBE), Av. Eduard Maristany, 16, 08019 Barcelona, Spain
Montserrat Pérez-Moya: Chemical Engineering Department, Universitat Politècnica de Catalunya, Escola d’Enginyeria de Barcelona Est (EEBE), Av. Eduard Maristany, 16, 08019 Barcelona, Spain

IJERPH, 2021, vol. 18, issue 3, 1-17

Abstract: Sulfaquinoxaline (SQX) has been detected in environmental water samples, where its side effects are still unknown. To the best of our knowledge, its oxidation by Fenton and photo-Fenton processes has not been previously reported. In this study, SQX oxidation, mineralization, and toxicity ( Escherichia coli and Staphylococcus aureus bacteria) were evaluated at two different setups: laboratory bench (2 L) and pilot plant (15 L). The experimental design was used to assess the influence of the presence or absence of radiation source, as well as different H 2 O 2 concentrations (94.1 to 261.9 mg L −1 ). The experimental conditions of both setups were: SQX = 25 mg L −1 , Fe(II) = 10 mg L −1 , pH 2.8 ± 0.1. Fenton and photo-Fenton were suitable for SQX oxidation and experiments resulted in higher SQX mineralization than reported in the literature. For both setups, the best process was the photo-Fenton (178.0 mg L −1 H 2 O 2 ), for which over 90% of SQX was removed, over 50% mineralization, and bacterial growth inhibition less than 13%. In both set-ups, the presence or absence of radiation was equally important for sulfaquinoxaline oxidation; however, the degradation rates at the pilot plant were between two to four times higher than the obtained at the laboratory bench.

Keywords: advanced oxidation process; photo-Fenton; emerging contaminants; sulfaquinoxaline; experimental design; oxidations; mineralization; toxicity (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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