1. 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.
- Author
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Aboudalle A, Fourcade F, Assadi AA, Domergue L, Djelal H, Lendormi T, Taha S, and Amrane A
- Subjects
- Biodegradation, Environmental, Biological Oxygen Demand Analysis, Hydroxyl Radical, Metronidazole metabolism, Oxidation-Reduction, Water Pollutants, Chemical chemistry, Water Pollutants, Chemical metabolism, Electrolysis, Hydrogen Peroxide chemistry, Iron analysis, Metronidazole chemistry, Oxygen analysis
- 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., (Copyright © 2018 Elsevier Ltd. All rights reserved.)- Published
- 2018
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