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A comparison between flow-through cathode and mixed tank cells for the electro-Fenton process with conductive diamond
I Moraleda1, N Oturan2, C Saez1
1University of Castilla-La Mancha, Chemical Engineering Department, Edificio Enrique Costa Novella. Campus Universitario s/n, 13005, Ciudad Real, Spain.
Chemosphere
|September 25, 2019
Summary
The electro-Fenton process effectively removes bromacil from wastewater. A mixed tank cell (MTC) with a specific cathode area achieved better bromacil mineralization than a flow-through cell (FTC), despite lower hydrogen peroxide production.
Area of Science:
- Environmental Chemistry
- Electrochemistry
- Water Treatment
Background:
- The electro-Fenton process is a promising advanced oxidation technique for degrading persistent organic pollutants in wastewater.
- Efficient production of hydrogen peroxide (H2O2) is crucial for the electro-Fenton process's effectiveness.
- Optimizing electrochemical cell design is key to maximizing H2O2 generation and pollutant removal.
Purpose of the Study:
- To compare the performance of a mixed tank cell (MTC) and a flow-through cell (FTC) in hydrogen peroxide production and bromacil removal using the electro-Fenton process.
- To investigate the influence of cathode-to-anode surface area ratio (Acathode/Aanode) in the MTC on H2O2 generation and bromacil degradation.
- To determine the optimal cell configuration for efficient bromacil mineralization.
Main Methods:
- Utilized two electrochemical cells: MTC and FTC, both equipped with boron-doped diamond (BDD) anodes and carbon felt cathodes.
- Varied the cathode-to-anode surface area ratio in the MTC.
- Monitored hydrogen peroxide production over time and with varying current densities.
- Assessed bromacil removal efficiency and mineralization using chromatographic techniques.
Main Results:
- Both MTC and FTC demonstrated H2O2 production that stabilized over time.
- FTC generally produced higher H2O2 concentrations, especially at higher current densities.
- MTC showed maximum H2O2 production at very low current densities, with higher cathode area leading to more H2O2 and lower cell voltage.
- Bromacil was rapidly depleted in all tested configurations.
- The MTC with the lowest cathode area achieved superior bromacil mineralization compared to the FTC.
Conclusions:
- While FTC produced more H2O2, the MTC with a specific cathode configuration was more effective for bromacil mineralization.
- Optimal H2O2 concentration for efficient bromacil mineralization might be lower than that achieved by FTC.
- Electrochemical cell design significantly impacts both H2O2 production and the overall efficiency of the electro-Fenton process for pollutant degradation.
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