Electrochemical method is a promising technology for biorefractory organic wastewater treatment. In this study, commercial available electrode materials, Ti=IrO2 and Cu/Zn, were used as anode and cathode, respectively, to treat CHCl3-contaminated water. The performance was investigated through cyclic voltammetry and paired electrolysis in an undivided cell. The voltammetric data revealed that the Cu/Zn cathode exhibited good electrocatalytic activity toward CHCl3 reduction. By contrast, no direct oxidation of CHCl3 was observed at the Ti=IrO2 anode. The reduction of CHCl3 at the Cu/Zn cathode took place through a three-step consecutive hydrodechlorination mechanism. During the paired electrolysis with current density of 15 mA=cm2, the chemical oxygen demand (COD) of CHCl3 solution was decreased from 194 to 74 mg=L within 300 min with an energy consumption of 28.6 kWh · L−1. A mild acidic environment (pH 4.6) was shown to be more favorable to CHCl3 abatement. Decreasing the anode/cathode surface area ratio also had significant impact on CHCl3 reduction, and the optimal ratio was 2.0. The results demonstrated that Cu/Zn cathode is a potential candidate for chlorinated organic compound removal.
|Number of pages||8|
|Journal||Journal of Environmental Engineering, ASCE|
|Publication status||Published - 2016|
- Anodic oxidation
- Catyhodic reduction