Influence of Sodium Sulfate on the Direct Red 28 Degradation by Ozone in a Wastewater Recycling Process: A Stoichiometric and Novel Image Analysis. (2nd September 2020)

• Record Type: Journal Article
• Authors: Pérez, Arizbeth; Poznyak, Tatyana; Chairez, Isaac; Guzmán-Zavaleta, Z. Jezabel; Alfaro-Ponce, Mariel
• Is Part Of: Ozone: science and engineering. Volume 42:Number 5(2020)
• Page Start: 428
• Page End: 438
• Publication Date: 2020-09-02
• Subjects: Ozonation -- azo dye -- additives -- recycling -- image processing -- dye fixation quality -- sodium sulfate; Ozone -- Periodicals; 665.89
• DOI: 10.1080/01919512.2019.1688134
• Languages: English
• ISSNs: 0191-9512

Abstract

ABSTRACT: The current study presents the treatment of water contaminated with the dye Direct Red 28 in the presence of Na2 SO4 at three different concentrations (10, 40 and 80 g/L) by simple ozonation. This wastewater treatment was considered in a wastewater recycling process. At the end of each ozonation cycle, ozonation dynamics, ozone consumption, pH, electrical conductivity and UV/Vis spectra variation were analyzed and correlated with the stoichiometric analysis balance. The efficiency of the wastewater treatment in each reuse cycle was evaluated by a novel image processing method. The image results show that the presence of sulfate improves more than 45% the dye fixation on a cotton sample. However, at high additive concentrations, the color quality decreases 25%, compared with the system with low additive concentration, due to the presence of peroxysulfate ions and the compounds accumulated through the ozonation process.