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Electrooxidation–Ultrasonication Hybrid Process for Antibiotic Chlortetracycline Treatment.

Tran, Nam; Drogui, Patrick; Nguyen, Laurent; Brar, Satinder Kaur (2016). Electrooxidation–Ultrasonication Hybrid Process for Antibiotic Chlortetracycline Treatment. Journal of Environmental Engineering , vol. 142 , nº 5. 04016011. DOI: 10.1061/(ASCE)EE.1943-7870.0001088.

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Résumé

This study investigated the electrochemical oxidation of chlortetracycline in aqueous solution using a Ti/PbO2 anode under ultrasound irradiations. The influence of various parameters such as electric current applied, power of ultrasound, and treatment time were evaluated and optimization process was investigated by using factorial design and central composite design methodology. The results indicated that the chlortetracycline degradation rate was greatly influenced by the current and the treatment time. A current intensity of 3.92 A under ultrasound irradiation of 20 W (at 500 kHz) for a period of treatment of 95 min were found to be the best conditions for chlortetracycline oxidation in term of cost-effectiveness. The initial concentration (10  mg/L) could be optimally diminished up to 73.3% while using a Ti/PbO2 anode. Under these conditions, a relatively high mineralization of chlortetracycline (61.4% of total organic carbon removal) was recorded. Then, the optimal conditions were applied on a municipal wastewater effluent (sampled after secondary treatment) and artificially contaminated with 10  μg/L, 100  μg/L, and 10  mg/L, respectively. The treatment was more effective with the municipal effluent (chlortetracycline could be oxidized up to 98%) because of the presence of chloride ions that could easily be transformed into active chlorine. Chlortetracycline could be oxidized by both direct anodic electrochemical oxidation (by means of hydroxyl radicals) and indirect electrochemical oxidation via mediators, such as hypochlorous acid generated by chloride oxidation.

Type de document:
Mots-clés libres: chlortetracycline; sonoelectrochemical; ultrasonication; electrooxidation
Centre: Centre Eau Terre Environnement
Date de dépôt: 20 déc. 2016 16:23
Dernière modification: 20 déc. 2016 16:23
URI: http://espace.inrs.ca/id/eprint/4015

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