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
; 199: 486-494, 2018 May.
Article
em En
| MEDLINE
| ID: mdl-29454171
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 0.07â¯mAâ¯cm-2, 0.1â¯mM of ferrous ions and pHâ¯=â¯3, the efficiency of 100â¯mgâ¯L-1 MTZ degradation and mineralization were 100% within 20â¯min and 40% within 135â¯min of electrolysis, respectively. The highest hydrogen peroxide and hydroxyl radical concentrations, 1.4â¯mM and 2.28â¯mM respectively, were obtained at 60â¯min electrolysis at 0.07â¯mAâ¯cm-2. Improvement of the biodegradability was reached from 60â¯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.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oxigênio
/
Eletrólise
/
Peróxido de Hidrogênio
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Ferro
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Metronidazol
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2018
Tipo de documento:
Article