Removal of reactive textile dye from aqueous solutions by electrocoagulation in a continuous cell

Abstract : In electrocoagulation (EC), coagulants are deliveredin situusing the corrosion of sacrificialanodes when a DC voltage is applied. Simultaneously, electrolytic gases (H2) are generated at the cathode. Aluminum and iron materials are usually used as anodes, the dissolution of which produces hydroxides and polymeric hydroxides. These coagulants are able to destabilize colloidal suspensions and emulsions, to adsorb, neutralize, or precipitate dissolved polluting species, and finally to form flocs that can be removed either by settling or flotation. The purpose of this study was to investigate the effects of the operating parameters, such as initial pH, initial concentration (C0), residence time (τ), current density (j), and inlet flow rate (Q), on the removal of a red nylosan dye by EC process using aluminum electrodein a continuous electrochemical reactor. FTIR analysis was conducted to interpret the functional groups involved during the EC process. It was found that the increase in the current density up to 100 A m−2 had increased the dye removal efficiency and the optimum inlet flow rate for EC process was the minimum at 15 L h−1 and it has increased the electrical energy consumption. A rate of abatement of about 90% for turbidity and 97% for color was observed, when the initial concentration of the dye C0 was lower than 300 mg L−1, current density j= 300 A m−2, conductivity κ= 2.54 mS cm−1, inlet flow rate Q=15Lh−1, residence Time τ= 35 min, and initial pH ranged from 2.3 to 8.8. The specific electrical energy consumption was 19.5 kW h per kilogramme of removed dye
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https://hal.univ-lorraine.fr/hal-01924795
Contributor : Francois Lapicque <>
Submitted on : Friday, November 16, 2018 - 11:53:31 AM
Last modification on : Tuesday, March 19, 2019 - 12:18:23 PM

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Abdallah Amour, Belkacem Merzouk, Jean-Pierre Leclerc, François Lapicque. Removal of reactive textile dye from aqueous solutions by electrocoagulation in a continuous cell. Desalination and Water Treatment, FHF, 2016, 57 (48-49), pp.22764 - 22773. ⟨10.1080/19443994.2015.1106094⟩. ⟨hal-01924795⟩

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