A Comparative Study in Pretreatments of Acid Chemical Wastewater by Electrochemical Oxidation and Ozonation

Authors

Han-shui LIU, College of Chemical Engineering and Materials Science, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032,China;
su YU, College of Chemical Engineering and Materials Science, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032,China;
Shao-ping TONG, College of Chemical Engineering and Materials Science, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032,China;Follow
Chun-an MA, College of Chemical Engineering and Materials Science, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032,China;

Corresponding Author

Shao-ping TONG(sptong@zjut.edu.cn)

Abstract

Under the condition of keeping certain acidity, the pretreatment efficiency of an acid chemical wastewater (pH 0.85) by electrochemical oxidation was compared with that by ozonation. The results showed that the electrochemical oxidation pretreatment could obtain a better result than the ozonation at pH 0.85. After the addition of 2 g·L^-1 NaCl and with the electrochemical oxidation pretreatment at 30 mA·cm^-2, the removal rate of chemical oxygen demand (CODCr) reached 43.4%, and the value of biochemical oxygen demand/chemical oxygen demand (BOD₅/COD_Cr) also increased from 0.034 to 0.14 in 20 minutes, indicating significantly improvement in the biodegradability of the wastewater. However, the ozonation alone had a low pretreatment efficiency at pH 0.85, and could only become as effective as those done by the electrochemical oxidation pretreatment at pH 7.0. A ozone-based advanced oxidation technology, Ti(Ⅳ)/O₃/H₂O₂, was also relatively effective at pH 2.85. The value of 22.9% for the removal rate of CODCr could be obtained and the value of BOD₅/COD_Cr went up from 0.034 to 0.072 in 16 min.

Graphical Abstract

Keywords

electrochemical oxidation, ozonation, advanced oxidation technology, titanium ion, acid chemical wastewater

DOI Link

https://doi.org/10.61558/2993-074X.2138

Publication Date

2013-10-28

Online Available Date

2013-03-18

Revised Date

2013-03-18

Received Date

2012-12-25

Recommended Citation

Han-shui LIU, su YU, Shao-ping TONG, Chun-an MA. A Comparative Study in Pretreatments of Acid Chemical Wastewater by Electrochemical Oxidation and Ozonation[J]. Journal of Electrochemistry, 2013 , 19(5): 472-476.
DOI: 10.61558/2993-074X.2138
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss5/11