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Treatment of Industrial Cork Processing Water by Ozonation and Ozone Based Advanced Oxidation Processes (O3/UV and O3/H2O2) in a Bubble Column Reactor

Abstract The treatment of industrial cork-processing water at natural pH (6.45) by ozonation alone and ozone based advanced oxidation processes (O3/H2O2 and O3/UVC) in a bubble column reactor was investigated with the view of establishing optimal operating process conditions. The reaction of ozone with the organic matter in the wastewater was found to begin in the mass transfer controlled kinetic regime (fast kinetic regime), shifting to the moderate and slow kinetic regime (reaction in the bulk liquid) at later stages of the ozonation reaction. The elimination of colour from the wastewater was found to correlate with a decrease in the total amount of phenolic species. The reaction temperature was found to have little influence on the observed rates of Total Organic Carbon (TOC) removal. In the treatment of the wastewater by peroxone or by the UVC-ozone process the TOC removal rates were enhanced by the production of highly reactive hydroxyl radicals. The analysis of the observed kinetics calls for an industrial treatment process involving the peroxone process in the early stages of the oxidation reaction up to complete colour removal, followed by the O3/UVC process.