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An Aqueous Phase Catalytic Ozonation Process for Removal of Micropollutants and Ozone ByproductsEPA Grant Number: U914801
Title: An Aqueous Phase Catalytic Ozonation Process for Removal of Micropollutants and Ozone Byproducts
Investigators: Pines, David S.
Institution: University of Massachusetts - Amherst
EPA Project Officer: Broadway, Virginia
Project Period: January 1, 1995 through June 14, 2002
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1995) Recipients Lists
Research Category: Academic Fellowships , Engineering and Environmental Chemistry , Fellowship - Engineering
The objective of this research project is to develop an aqueous phase transition metal catalyst that will enhance the ozonation process by accelerating the destruction of micropollutants and ozonation byproducts such as biodegradable organic carbon and bromate.
The evaluation of a catalytic ozonation process for drinking water treatment is being performed in three phases. Phase 1 will evaluate a homogeneous catalyst for the oxidation of a model compound, a hydrophilic acid fraction from a filter effluent, and the waste filter effluent itself. A hydroxyl radical probe compound is included in the matrix to determine if the catalytic mechanism includes the generation of hydroxyl radicals. The primary emphasis of this phase is to better understand the catalytic reaction pathway. Phase 2 will emphasize the development of a catalyst for use in drinking water treatment. Various heterogeneous catalysts will be evaluated. If the reaction mechanism also includes the generation of hydroxyl radicals, the water will be spiked with toxic contaminants that are resistant to direct oxidation by ozone. Tests also will be performed to determine if the catalytic process can reduce bromate, because the formation of bromate is a major deterrent in using ozone for bromide-containing waters. Phase 3 will study the surface adsorption characteristics of a heterogeneous catalyst at the molecular level using an in situ attenuated total reflectance infrared absorption method. A structural understanding of the surface complexes will provide information about the reaction pathway and will enhance the development of an effective catalyst.