title: Degradation of model olive mill contaminants of OMW catalysed by zero-valent iron enhanced with a chelant.
abstract: The aim of this study was to investigate the effect of a chelated zero valent iron as catalyst on the oxidation of six organic acids that are generally found in olive mill wastewater. The reaction was carried out in a stirred tank reactor under extremely mild conditions, a temperature of 30°C and atmospheric pressure. Solutions of 350 mg/L of the six organic compounds were treated individually using zero valent iron particles (15 g), nitrilotriacetic acid disodium salt (NTA, 100mg/L) and air. The efficiency of the process was evaluated to determine the organic compound conversion, the chemical oxygen demand (COD) reduction and the total organic carbon (TOC) reduction. The caffeic, 4-hydroxyphenylacetic and vanillic acids showed a total conversion after 180, 240 and 300 min of reaction, respectively. In turn, coumaric acid, tyrosol and cinnamic acid only reached conversions of 90, 87 and 68%, respectively, after 360 min of reaction. Four mixtures of the six acids with an initial total concentration of 1000 mg/L were also tested and gave an overall conversion of the organic compounds of 92-99% after 360 min of reaction. The COD conversions of the mixtures were always above 84%, but the TOC conversions values were lower, indicating a poorer mineralization.
authors: Departament d'Enginyeria Química, Escola Tècnica Superior d'Enginyeria Química, Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Catalonia, Spain.
authors: Irama
authors: I
authors: Sanchez
authors: Frank
authors: F
authors: Stüber
authors: Azael
authors: A
authors: Fabregat
authors: Josep
authors: J
authors: Font
authors: Agustí
authors: A
authors: Fortuny
authors: Christophe
authors: C
authors: Bengoa
mesh_terms: D002384:Catalysis; D002614:Chelating Agents / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D008962:Models, Theoretical; D031658:Olea; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D007501:Iron