Ozonation kinetics of phenolic compounds present in table olive wastewaters: p-hydroxybenzoic acid, tyrosol and p-coumaric acid

A kinetic study of the degradation by ozone of three phenolic compounds pre sent in table olive wastewaters and other agroindustrial wastewaters has be en performed by using a competition kinetic method. The selected phenolic c ompounds were: p-hydroxybenzoic acid, p-coumaric acid and tyrosol. The infl uence of the operating variables (temperature and pH) is established and th e stoichiometric ratios for the individual direct reactions between ozone a nd each compound are determined. Once the reaction rate constants were eval uated, they have been correlated as a function of temperature and pH into k inetic expressions which are provided for every phenolic compound. The glob al process occurs in the fast and pseudo first order kinetic regime of abso rption, a condition required by the competition model to be used.