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Article Dans Une Revue Separation and Purification Technology Année : 2011

Feasibility of an electrochemical pre-treatment prior to a biological treatment for tetracycline removal

Résumé

The purpose of this work was to examine biodegradability improvement of tetracycline-containing solutions after an electrochemical pre-treatment, since about 70% of the applied drugs are not metabolized and hence can be found in wastewaters. Cyclic voltammetry with a vitreous carbon electrode revealed a significant electrochemical activity of tetracycline. Electrochemical treatment was therefore performed in a home-made flow cell. The effect of some operating conditions, tetracycline concentration, flow rate and the applied potential was investigated. Optimal conditions led to more than 99% conversion yield of tetracycline in oxidation and reduction, using a neutral salt as supporting electrolyte. TOC analyses of the electrolyzed solution revealed that the level of mineralization remained low, underlying the interest of a combined electrochemical and biological treatment. The biodegradability, based on the BOD5 on COD ratio, increased with the oxidation potential from 0.13 to 0.39, namely a biodegradable solution, for 1.0 and 1.6 V/SCE, respectively. None of the electrolyzed solutions in reduction was biodegradable even if it was not toxic for the activated sludge. If the reduction is combined with a subsequent oxidation, BOD5/COD ratio reached a value of 0.39 when the oxidation at 1.0 V/SCE was preceded by a reduction at −1.3 V/SCE.

Domaines

Matériaux

Dates et versions

hal-00842677 , version 1 (09-07-2013)

Identifiants

Citer

Daouia Belkheiri, Florence Fourcade, Florence Geneste, Didier Floner, Hamar Aït-Amar, et al.. Feasibility of an electrochemical pre-treatment prior to a biological treatment for tetracycline removal. Separation and Purification Technology, 2011, 83, pp.151-156. ⟨10.1016/j.seppur.2011.09.029⟩. ⟨hal-00842677⟩
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