Development of an Enhanced Ozone-hydrogen Peroxide Advanced Oxidation Process

Abstract

Advanced chemical oxidation processes (AOP’s), particularly processes using.ozone, involve a rapidly growing area of environmental research and applications. A need exists, however, for improvements to AOP’s to make them less costly and more effective. This paper evaluated the addition of a fixed bed of sand to the conventional H2O2-O3 process as a function of reactor configuration, pH, and sand type. The West Liberty sand consisting of the greatest concentrations of iron and manganese yielded the best results, showing 15% more phenol removal than Muscatine sand and 28% more removal than no sand (i.e. H2O2-O3). Phenol degradation product formation and disappearance rates in comparison to the direct ozonation and O3-H2O2 processes indicate metal-oxide sand surface-catalyzed H2O2 decomposition improves the conventional O3-H2O2 advanced oxidation process at pH 7. Analysis of results suggests the enhancement is a result of increased formation of essential oxygen radical intermediates (i.e. hydroxyl radical). Direct ozonation, however, was equally effective at phenol removal at pH 8.9 because the conjugate base of phenol (i.e. phenate ion) has a direct ozonation reaction rate constant six orders of magnitude greater than phenol.KeywordsPhenol DegradationAdvance Oxidation ProcessSand ColumnPhenol RemovalReactor ConfigurationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.