Oxidative Efficiency of Ozonation Coupled with Electrolysis for Treatment of Acid Wastewater

Authors

Ze-You Hu, 1. College of Chemical Engineering, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;
Feng-Yun Xiang, 2. Hangzhou Chengjie Environmental Protection Limited Corporation, Hangzhou 311228, Zhejiang, China;
Ji-Qiang Mao, 2. Hangzhou Chengjie Environmental Protection Limited Corporation, Hangzhou 311228, Zhejiang, China;
Ya-Lei Ding, 1. College of Chemical Engineering, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;
Shao-Ping Tong, 1. College of Chemical Engineering, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;Follow

Corresponding Author

Shao-Ping Tong(sptong@zjut.edu.cn)

Abstract

Establishment of an ozone-based advanced oxidation process (AOPs-O₃) for effective treatment of acid wastewater is an important and difficult task. The process of ozonation coupled with electrolysis (electrolysis-ozonation, E-O₃) has been reported to effectively degrade pollutants in neutral solution. We studied the efficiency of E-O₃ for degradation of acetic acid (HAc, an ozone inert chemical) in acid solution and found that E-O₃ had high oxidative efficiency at pH less than 3. For example, 52.2% of 100 mg·L^-1 HAc could be removed by E-O₃ in 120 min at pH 1.0, but only 2.2% and 3.5% by electrolysis and ozonation, respectively. Although the efficiency of E-O₃ decreased with the increase of acidity of solution, it still remained relatively high even at pH 0. An aromatic compound of acetophenone could also be effectively degraded by E-O₃ at pH 1.0. The results indicate that electrons can transfer from cathode to dissolved ozone or oxygen in acidic solution, thus resulting in generation of reactive species, e.g. hydroxyl radicals. A real acidic wastewater was also effectively pretreated by E-O₃. This study provides a promising AOPs-O₃ for treatment of acid wastewaters.

Graphical Abstract

Keywords

electrolysis, ozone, acetic acid, efficiency, acid wastewater

DOI Link

https://doi.org/10.13208/j.electrochem.210419

Publication Date

2022-01-28

Online Available Date

2021-08-13

Revised Date

2021-05-25

Received Date

2021-04-19

Recommended Citation

Ze-You Hu, Feng-Yun Xiang, Ji-Qiang Mao, Ya-Lei Ding, Shao-Ping Tong. Oxidative Efficiency of Ozonation Coupled with Electrolysis for Treatment of Acid Wastewater[J]. Journal of Electrochemistry, 2022 , 28(1): 2104191.
DOI: 10.13208/j.electrochem.210419
Available at: https://jelectrochem.xmu.edu.cn/journal/vol28/iss1/5