OZONATION KINETICS OF PHENOLIC COMPOUNDS PRESENT IN TABLE OLIVE WASTEWATERS: p-HYDROXYBENZOIC ACID, TYROSOL AND p-COUMARIC ACID

Abstract

A kinetic study of the degradation by ozone of three phenolic compounds present in table olive wastewaters and other agroindustrial wastewaters has been performed by using a competition kinetic method. The selected phenolic compounds were: p-hydroxybenzoic acid, p-coumaric acid and tyrosol. The influence of the operating variables (temperature and pH) is established and the stoichiometric ratios for the individual direct reactions between ozone and each compound are determined. Once the reaction rate constants were evaluated, they have been correlated as a function of temperature and pH into kinetic expressions which are provided for every phenolic compound. The global process occurs in the fast and pseudo first order kinetic regime of absorption, a condition required by the competition model to be used.