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Reactive oxygen and iron species monitoring to investigate the electro-Fenton performances. Impact of the electrochemical process on the biodegradability of metronidazole and its by-products

Abstract : In this study, the monitoring of reactive oxygen species and the regeneration of the ferrous ions catalyst were performed during electro-Fenton (EF) process to highlight the influence of operating parameters. The removal of metronidazole (MTZ) was implemented in an electrochemical mono-compartment batch reactor under various ranges of current densities, initial MTZ and ferrous ions concentrations, and pH values. It was found that under 0.07 mA cm−2, 0.1 mM of ferrous ions and pH = 3, the efficiency of 100 mg L−1 MTZ degradation and mineralization were 100% within 20 min and 40% within 135 min of electrolysis, respectively. The highest hydrogen peroxide and hydroxyl radical concentrations, 1.4 mM and 2.28 mM respectively, were obtained at 60 min electrolysis at 0.07 mA cm−2. Improvement of the biodegradability was reached from 60 min of electrolysis with a BOD5/COD ratio above 0.4, which was reinforced by a respirometric study, that supports the feasibility of coupling electro-Fenton and biological treatment for the metronidazole removal.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01740153
Contributor : Laurent Jonchère <>
Submitted on : Friday, May 4, 2018 - 10:40:25 AM
Last modification on : Thursday, March 5, 2020 - 2:06:58 PM
Long-term archiving on: : Tuesday, September 25, 2018 - 5:51:50 PM

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A. Aboudalle, F. Fourcade, A.A. Assadi, L. Domergue, H. Djelal, et al.. Reactive oxygen and iron species monitoring to investigate the electro-Fenton performances. Impact of the electrochemical process on the biodegradability of metronidazole and its by-products. Chemosphere, Elsevier, 2018, 199, pp.486-494. ⟨10.1016/j.chemosphere.2018.02.075⟩. ⟨hal-01740153⟩

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