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Statistical optimization of electrochemical oxidation of ethylene glycol using response surface methodology.

Jardak, Karama; Dirany, Ahmad; Drogui, Patrick; El Khakani, My Ali (2017). Statistical optimization of electrochemical oxidation of ethylene glycol using response surface methodology. Process Safety and Environmental Protection , vol. 105 . p. 12-20. DOI: 10.1016/j.psep.2016.08.021.

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Résumé

Large amounts of ethylene glycol (EG) based antifreeze liquids are daily discharge into the receiving waters. The chemical oxygen demand (COD) detected in most of the lakes and rivers close to the discharge points exceeded 100,000 mg O₂/L. With such an amount, biological and chemical processes are inefficient to completely remove EG. In order to efficiently remove EG, electrochemical oxidation (ECO) of EG was carried out. Niobium Boron Doped Diamond (Nb/BDD) was used as anode whereas carbon felt was used as cathode. Different operating parameters including current intensity, treatment time, electrolyte concentration and pollutant concentration were tested. The application of 0.077 A/cm² of current density during 120 min in the presence of 7.0 g/L of Na₂SO₄allowed 89.6 ± 0.2% of COD removal with 490 mg O₂/L of residual COD. This result was far below the legislation standard set by the province of Quebec that allows the discharge of 800 mg O₂/L of COD. The efficiency of ECO process was attributed to both direct and indirect oxidation that generate strong oxidizing species (OH°, S₂O₈²⁻, H₂O₂, etc.) capable of oxidizing organic matters on the surface of the anode and in the bulk of the solution.

Type de document:
Mots-clés libres: ethylene glycol; electrochemical oxidation; factorial; central composite design
Centre: Centre Eau Terre Environnement
Date de dépôt: 16 juin 2017 17:47
Dernière modification: 16 juin 2017 17:47
URI: http://espace.inrs.ca/id/eprint/5157

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