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Electrochemical oxidation of 2,4-Dichlorophenoxyacetic acid: Analysis of by-products and improvement of the biodegradability

Abstract : The relevance of an electrochemical pre-treatment of 2,4-D prior to a biological process with the aim of increasing the biodegradability of a 2,4-D effluent was examined. A homemade flow-cell was used and electrolysis were performed at 1.6 V/SCE on a bare graphite felt. After a single pass through the cell, 96% elimination yield was obtained. After electrolysis, 34% of the initial dissolved organic carbon was mineralized, and COD decreased by 41%. The results were promising as the biodegradability of the effluent, evaluated through the BOD5/COD ratio, was improved from 0.04 to 0.25. In a second part, main degradation by-products were identified and quantified. Results showed that Chlorohydroquinone and 4-Chlorocatechol represented 35% and 10% of the fate of the initial 2,4-D, respectively. Other by-products such as 2,4-Dichlorophenol and glycolic acid were also detected. Finally, a mechanism scheme was proposed for the two main by-products.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-00843822
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Submitted on : Friday, July 12, 2013 - 11:18:02 AM
Last modification on : Thursday, March 5, 2020 - 2:07:15 PM

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Jean-Marie Fontmorin, Samuel Huguet, Florence Fourcade, Florence Geneste, Didier Floner, et al.. Electrochemical oxidation of 2,4-Dichlorophenoxyacetic acid: Analysis of by-products and improvement of the biodegradability. Chemical Engineering Journal, Elsevier, 2012, 195-196, pp.208-217. ⟨10.1016/j.cej.2012.04.058⟩. ⟨hal-00843822⟩

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