ABSTRACT The current study presents the treatment of water contaminated with the dye Direct Red 28 in the presence of Na2SO4 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.

中文翻译：

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硫酸钠对废水回收过程中臭氧直接降解红 28 的影响：化学计量和新图像分析

摘要 当前的研究介绍了在三种不同浓度（10、40 和 80 g/L）的 Na2SO4 存在下，通过简单的臭氧化处理被染料 Direct Red 28 污染的水。在废水回收过程中考虑了这种废水处理。在每个臭氧化循环结束时，对臭氧化动力学、臭氧消耗、pH、电导率和 UV/Vis 光谱变化进行分析，并将其与化学计量分析平衡相关联。通过一种新的图像处理方法评估了每个再利用循环中废水处理的效率。图像结果表明，硫酸盐的存在使棉样品上的染料固色率提高了 45% 以上。然而，在高添加剂浓度下，与低添加剂浓度系统相比，颜色质量下降 25%，