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In situ reactive oxygen species production for tertiary wastewater treatment.

Guitaya, Mandé Léa Rosine; Drogui, Patrick; Blais, Jean-François (2015). In situ reactive oxygen species production for tertiary wastewater treatment. Environmental Science and Pollution Research , vol. 22 , nº 9. p. 7025-7036. DOI: 10.1007/s11356-014-3907-3.

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Résumé

The goal of this research was to develop a new approach for tertiary water treatment, particularly disinfection and removal of refractory organic compounds, without adding any chemical. Hydrogen peroxide can indeed be produced from dissolved oxygen owing to electrochemical processes. Using various current intensities (1.0 to 4.0 A), it was possible to in situ produce relatively high concentration of H₂O₂ with a specific production rate of 0.05 × 10⁻⁵ M/min/A. Likewise, by using ultraviolet-visible absorption spectroscopy method, it was shown that other reactive oxygen species (ROS) including HO* radical and O₃ could be simultaneously formed during electrolysis. The ROS concentration passed from 0.45 × 10⁻⁵ M after 20 min of electrolysis to a concentration of 2.87 × 10⁻⁵ M after 100 min of electrolysis. The disinfection and the organic matter removal were relatively high during the tertiary treatment of municipal and domestic wastewaters. More than 90 % of organic compounds (chemical oxygen demand) can be removed, whereas 99 % of faecal coliform abatement can be reached. Likewise, the process was also effective in removing turbidity (more than 90 % of turbidity was removed) so that the effluent became more and more transparent.

Type de document: Article
Mots-clés libres: carbon felt; clean technology; electrooxidation; reactive oxygen species; tertiary treatment; wastewater
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 avr. 2018 18:33
Dernière modification: 18 avr. 2018 18:33
URI: http://espace.inrs.ca/id/eprint/3594

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