Abatement of the major contaminants present in olive oil industry wastewaters by different oxidation methods: ozone and/or UV radiation versus solar light.
Four different cinnamic acids (caffeic acid, ferulic acid, p-coumaric acid and cinnamic acid) present in olive oil wastewaters, were treated with advanced oxidation methods: ozone and/or UV radiation. Basic and acid media were tested. Differences between all four acids were found, both in the reaction times and the intermediates formed. Based on a careful study of these intermediates and the variation of their concentrations all along the reaction time, a general mechanism for the degradative oxidation of cinnamic acids is proposed. These results are compared with those obtained with solar light, using a pyrylium salt as a catalyst.
Miranda
Dipartimento de Quimica e Instituto de Tecnología Química UPV-CSIC, Universidad Politécnica de 22012, Valencia, Spain. mmiranda@qim.upv.es
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D002934:Cinnamates / Q000737:chemistry; D007220:Industrial Waste; D007700:Kinetics; D000069463:Olive Oil; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D010777:Photochemistry; D010938:Plant Oils; D013472:Sunlight; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D002934:Cinnamates; D007220:Industrial Waste; D000069463:Olive Oil; D010083:Oxidants, Photochemical; D010938:Plant Oils; C029010:cinnamic acid; D010126:Ozone