Oxalic acid mineralization by electrochemical oxidation processes
Yao-Hui Huang1, Yu-Jen Shih, Cheng-Hong Liu
1Department of Chemical Engineering, National Chen-Kung University, Tainan 701, Taiwan. yhhuang@mail.ncku.edu.tw
Journal of Hazardous Materials
|February 16, 2011
Summary
Electrochemical oxidation effectively mineralizes oxalic acid. Chloride electrolysis in acidic conditions achieved 99% TOC removal, outperforming the Fered-Fenton process.
Area of Science:
- Environmental Chemistry
- Electrochemistry
- Water Treatment
Background:
- Oxalic acid is a key intermediate in aromatic compound oxidation.
- Effective methods for oxalic acid mineralization are crucial for environmental remediation.
Purpose of the Study:
- To compare two electrochemical oxidation processes for oxalic acid mineralization.
- To investigate the role of additives (H2O2, Fe2+, Cl-) and pH on mineralization efficiency.
Main Methods:
- Electrochemical oxidation using Ti-DSA anode and S.S. cathode.
- Fered-Fenton process with H2O2 and Fe2+.
- Electrolysis with Cl- as an additive reagent.
Main Results:
- Fered-Fenton process achieved 85% TOC removal.
- Chloride electrolysis without H2O2/Fe2+ showed higher efficiency due to hypochlorite formation.
- Electrolytic hypochlorite generation surpassed commercial hypochlorite dosage.
- Acidic conditions and Cl- electrolysis yielded 99% TOC removal.
Conclusions:
- Electrochemical oxidation, particularly with Cl- in acidic media, is highly effective for oxalic acid mineralization.
- pH is a critical factor influencing chlorine chemistry and mineralization efficiency.
- This method offers a superior alternative to traditional Fered-Fenton processes for treating aromatic oxidation byproducts.
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