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Coupled electrocoagulation-electro-Fenton for efficient domestic wastewater treatment.

Daghrir, Rimeh; Drogui, Patrick (2013). Coupled electrocoagulation-electro-Fenton for efficient domestic wastewater treatment. Environmental Chemistry Letters , vol. 11 , nº 2. p. 151-156. DOI: 10.1007/s10311-012-0390-2.

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Résumé

This article reports the first use of coupled electrocoagulation and electro-Fenton (EF-EC) to clean domestic wastewater. Domestic wastewater contains high amounts of organic, inorganic and microbial pollutants that cannot be usually treated in a single step. Here, to produce an effluent suitable for discharge in a single process step, a hybrid process combining electrocoagulation and electro-Fenton was simultaneously used to decrease chemical oxygen demand (COD), turbidity and total suspended solids (TSS) from domestic wastewater. The electrocoagulation-electro-Fenton process was firstly tested for the production of H2O2 using Ti-IrO2 and vitreous carbon- or graphite electrodes arranged at the anode and the cathode, respectively. The concentration of H2O2 recorded at 1.5 A of current intensity during 60 min of electrolysis using vitreous carbon- and graphite electrodes at the cathode was 4.18 and 1.62 mg L-1, respectively. By comparison, when the iron electrode was used at the anode, 2.05 and 1.06 mg L-1 of H2O2 were recorded using vitreous carbon and graphite, respectively. The H2O2 concentration decrease was attributed to hydroxyl radical formation generated by the Fenton reaction. Electro-Fenton using iron electrode at the anode and vitreous carbon at the cathode with a current density imposed of 0.34 A dm-2 ensures the removal efficiency of 50.1 % CODT, 70.8 % TSS and 90.4 % turbidity. The electrocoagulation-electro-Fenton technique is therefore a promising secondary treatment to simultaneously remove organic, inorganic and microbial pollutants from domestic, municipal and industrial wastewaters.

Type de document:
Mots-clés libres: domestic wastewater; electro-Fenton; electrocoagulation; graphite electrode; iron electrode; vitreous carbon electrode
Centre: Centre Eau Terre Environnement
Date de dépôt: 05 déc. 2016 20:38
Dernière modification: 05 déc. 2016 20:38
URI: http://espace.inrs.ca/id/eprint/3409

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