Full Description

Advanced Oxidation Processes (AOPs) are now recognized to be apotentially inexpensive and relatively easy means to achieve degradation of importantcontaminants in water. The effects of AOPs on emerging contaminants such as those on theCandidate Contaminant List (CCL) need to be assessed systematically in a variety of waterquality matrices. The objectives of the research are to evaluate the degradation kinetics andbyproducts of select CCL contaminants using a combination of AOP processes including ozone,ozone/peroxide, ozone/UV, and UV/peroxide. In addition, the relative OH radical productionefficiency of each of these AOPs will be assessed under select challenging water qualitymatrices. It is hypothesized that AOPs will be an effective means to degrade many CCLcontaminants and that with proper system design, water quality challenges found in typicaltreatment scenarios will not compromise effective AOP treatment.The research approach integrates the expertise and experience of the co-investigatorsin environmental chemistry and advanced oxidation process design to address these importantquestions and others. In Phase I, specific groups of contaminants on the US Environmental Protection Agency CCL will beevaluated for AOP treatment response using numerous AOP processes. Initially, these CCLcontaminants will be evaluated in groups, based on chemical structure and commonality inanalytical methods to determine the least reactive chemicals in each group. Based on theseresults, select contaminants will be used in Phase II to evaluate the impacts and interactions ofAOP operational parameters and water quality (e.g. total organic carbon, alkalinity, pH) oncontaminant degradation and product distribution. A statistical experimental design will beutilized in Phase II. Finally, to provide fundamental information on the AOP processesimportant to successful implementation and engineering, Phase III will investigate the OHradical production efficiency of each AOP tested under select water quality scenarios identifiedin Phase II. Competition for hydroxyl radicals between contaminants and natural waterconstituents, such as total organic carbon and alkalinity will be investigated, and the resultsshould aid AOP design by indicating how best to incorporate upstream treatment systems. Includes tables, figures.

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Edition: Vol. - No. Published: 11/02/2003 Number of Pages: 24File Size: 1 file , 600 KB