Optimization of Advanced Oxidation Processes (AOP) for Water Reuse
Fernando L. Rosario-Ortiz, University of Colorado at Boulder (formerly of the Southern Nevada Water Authority)
Eric C. Wert, Southern Nevada Water Authority
Shane A. Snyder, University of Arizona (formerly of the Southern Nevada Water Authority)
Stephen P. Mezyk, California State University at Long Beach
The use of indirect potable reuse (IPR) to augment and sustain water supplies is being actively evaluated to confront availability problems. However, one of the main issues associated with IPR is the presence of micropollutants that are of potential health and ecological concern. The application of advanced oxidation processes (AOPs), including ozone, ozone with hydrogen peroxide (H2O2), and UV light with H2O2, has been shown to be effective for the removal of micropollutants. The increased effectiveness of AOPs for contaminant removal is due to the formation of hydroxyl radicals, which non-selectively react with a wide range of micropollutants. However, the hydroxyl radical also reacts with water quality components (e.g., alkalinity, total organic carbon [TOC]), limiting AOP effectiveness, a problem commonly referred to as scavenging.
The main goal of this study was to evaluate AOP performance from the perspective of the reactivity of hydroxyl radicals toward effluent organic matter (EfOM) and the effects on the efficiency of AOPs for micropollutant oxidation. The results from this study indicate that, depending on the specific properties of the EfOM (including molecular mass and polarity), AOP treatment could be optimized by varying conditions that are targeted for a specific water quality. The observed variability in EfOM reactivity also suggests that in some cases the efficacy of an AOP for micropollutant removal may be dependent on the changes to the EfOM.
(2011, 102 pages, 06-012-1)
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