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Hybrid Process Combining Electrocoagulation and Electro-Oxidation Processes for the Treatment of Restaurant Wastewaters.

Daghrir, Rimeh; Drogui, Patrick; Blais, Jean-François; Mercier, Guy (2012). Hybrid Process Combining Electrocoagulation and Electro-Oxidation Processes for the Treatment of Restaurant Wastewaters. Journal of Environmental Engineering , vol. 138 , nº 11. p. 1146-1156. DOI: 10.1061/(ASCE)EE.1943-7870.0000579.

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Résumé

The present study investigates the electrocoagulation-electro-oxidation (EC-EO) process for the treatment of restaurant wastewater (RWW) loaded with organic and inorganic matter, oil, grease, and suspensions solids. The EC-EO process was evaluated in terms of its capability to simultaneously produce an oxidant and coagulant agents by using either iron or aluminum electrodes arranged in a bipolar configuration or graphite electrodes arranged in a monopolar configuration in the same electrolytic cell. Relatively high concentrations of active chlorine (9.6  mg/min) and aluminum (20–40  mg Al/L) or iron (40–60  mg Fe/L) were produced in situ. The best performance for RWW treatment was obtained by using aluminum and graphite plates alternated in the electrode pack and operated at current of 0.4 A during 90 min of treatment with pH adjusted to approximately 7.0. Under these conditions, more than 98% of oil and greases (O&G) were removed, whereas chemical oxygen demand (COD) and biological oxygen demand (BOD) removal reached 90% and 86%, respectively. Likewise, more than 88% of soluble phosphate was removed, and the process was effective in removing turbidity (98%) and suspended solids (98%). The EC-EO process operated under the best conditions involved a total cost of US$1.56±0.01/m3 of treated restaurant effluent. This cost includes energy and electrode consumption, chemicals, and sludge disposal.

Type de document: Article
Mots-clés libres: electro-oxidation; electrocoagulation; restaurant wastewater; graphite electrode; aluminum electrode
Centre: Centre Eau Terre Environnement
Date de dépôt: 19 nov. 2020 21:02
Dernière modification: 19 nov. 2020 21:02
URI: http://espace.inrs.ca/id/eprint/10560

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