title: Electrochemical treatment of olive mill wastewater: treatment extent and effluent phenolic compounds monitoring using some uncommon analytical tools.
abstract: Problems related with industrials effluents can be divided in two parts: (1) their toxicity associated to their chemical content which should be removed before discharging the wastewater into the receptor media; (2) and the second part is linked to the difficulties of pollution characterisation and monitoring caused by the complexity of these matrixes. This investigation deals with these two aspects, an electrochemical treatment method of an olive mill wastewater (OMW) under platinized expanded titanium electrodes using a modified Grignard reactor for toxicity removal as well as the exploration of the use of some specific analytical tools to monitor effluent phenolic compounds elimination. The results showed that electrochemical oxidation is able to remove/mitigate the OMW pollution. Indeed, 87% of OMW color was removed and all aromatic compounds were disappeared from the solution by anodic oxidation. Moreover, 55% of the chemical oxygen demand (COD) and the total organic carbon (TOC) were reduced. On the other hand, UV-Visible spectrophotometry, Gaz chromatography/mass spectrometry, cyclic voltammetry and 13C Nuclear Magnetic Resonance (NMR) showed that the used treatment seems efficaciously to eliminate phenolic compounds from OMW. It was concluded that electrochemical oxidation in a modified Grignard reactor is a promising process for the destruction of all phenolic compounds present in OMW. Among the monitoring analytical tools applied, cyclic voltammetry and 13C NMR a re among th e techniques that are introduced for thefirst time to control the advancement of the OMW treatment and gave a close insight on polyphenols disappearance.
authors.affiliation: Laboratory of Water, Energy and Environment, Sfax University, ENIS, BP "1173" 3038, Sfax, Tunisia. chokribel@yahoo.fr
authors.forename: Chokri
authors.initials: C
authors.lastname: Belaid
authors.forename: Moncef
authors.initials: M
authors.lastname: Khadraoui
authors.forename: Salma
authors.initials: S
authors.lastname: Mseddii
authors.forename: Monem
authors.initials: M
authors.lastname: Kallel
authors.forename: Boubaker
authors.initials: B
authors.lastname: Elleuch
authors.forename: Jean Frangois
authors.initials: JF
authors.lastname: Fauvarque
mesh_terms: D057919:Biological Oxygen Demand Analysis; D004563:Electrochemistry / Q000379:methods*; D007220:Industrial Waste; D031658:Olea; D010636:Phenols / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D007220:Industrial Waste; D010636:Phenols