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Issue 6, 2020
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Investigation of titanium mesh as a cathode for the electro-Fenton process: consideration of its practical application in wastewater treatment

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Abstract

This study investigated the performance of organic pollutant degradation using the electro-Fenton process and low-cost titanium (Ti) electrodes as cathodes. Three Ti electrodes with different morphologies, i.e., a plate and two meshes with large (MS-L) and small (MS-S) opening sizes, were evaluated using electrochemical characterization, as well as kinetic and energy studies based on the COD removal performance of the electro-Fenton process. The preliminary results indicated that the MS-S electrode, which has the largest electrochemically active surface area and lowest resistance amongst the three electrodes, could reduce Fe3+ to Fe2+ most effectively in the synthetic solution. However, when treating real wastewater, MS-L rather than MS-S exhibited 13.8% higher COD removal efficiency with a 1.5-fold higher rate constant (i.e., 0.0362 min−1) during the initial 30 min of the electro-Fenton process. This unexpected anomaly was due to excessive clogging by suspended solids (SS) present in the real wastewater that were easily captured by the narrow openings of MS-S. Consequently, a pilot-scale electro-Fenton system was operated using MS-L. The pilot experiment demonstrated stable degradation of organic pollutants for five consecutive months with an average COD removal efficiency of 86%, showing its feasibility in treating real wastewater. With its competitive regeneration of Fe2+, low manufacturing cost and energy consumption, the electro-Fenton process using Ti mesh with large opening sizes appears to be a viable and practical technology for wastewater treatment.

Graphical abstract: Investigation of titanium mesh as a cathode for the electro-Fenton process: consideration of its practical application in wastewater treatment

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Supplementary files

Article information


Submitted
31 Dec 2019
Accepted
01 Apr 2020
First published
17 Apr 2020

Environ. Sci.: Water Res. Technol., 2020,6, 1627-1637
Article type
Paper

Investigation of titanium mesh as a cathode for the electro-Fenton process: consideration of its practical application in wastewater treatment

J. Lee, A. Son, Y. Ko, M. Shin, W. S. Kim, J. W. Choi, J. Lee and S. W. Hong, Environ. Sci.: Water Res. Technol., 2020, 6, 1627
DOI: 10.1039/C9EW01144G

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