Research on Ozone-Enhanced Oxidation of Industrial Zinc Sulfite from Flue Gas Desulfurization

ABSTRACT

This study investigates the air oxidation and ozone-enhanced oxidation of zinc sulfite. Zinc sulfite was prepared by reacting pure or industrial zinc oxide with SO₂ in water. The oxidation experiments were conducted under constant temperature conditions, with slurry, oxygen, and ozone concentrations in the ranges of 0.5–4%, 10–60%, and 1100–1920 ppm, respectively. The experiments involved determining the zinc ion concentration, sulfite concentration, dissolved oxygen, ozone concentration in the exhaust gas, and total organic carbon value for analysis of the oxidation process. The findings revealed that the mass transfer rate of O₂ and/or O₃ determined the reaction rate in the main stage of the oxidation process, while ozone affected the non-mass transfer control stage, resulting in an average enhancement of 15% in the oxidation rate. Furthermore, ozone causes organic matter attached to industrial zinc sulfite particles to fall off into the solution, significantly improving the oxidation ratio of industrial zinc sulfite.

KEYWORDS:

• Controlling step analysis
• oxidation rate
• ozone
• TOC
• zinc sulfite

Acknowledgments

Thanks to the support of Beijing University of Chemical Technology, and Mr. Tong Hua’s guidance.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The authors confirm that the data supporting the findings of this study are available within the article [and/or] its supplementary materials.

Author contributions

The experimental operation and data processing of this study were done by Chen Xiaoyu, and the experimental conceptualization, discussion and analysis as well as line revision were done by Chen Xiaoyu and Tong Hua.

Additional information

Funding

This study was supported by Fundamental Research Funds for the Central Universities of Beijing University of Chemical Technology.