Full Description

Several approaches for modeling UV/Hsub2/subOsub2/sub Advanced Oxidation Processes (AOPs) exist,including the steady state hydroxyl radical (OH) radical method (Glaze et al, 1995) as well as thecommercially available AdOx method (Crittenden et al, 1999). While these approachesperform decently in approximating chemical destruction for the UV/Hsub2/subOsub2/sub AOPs, theyrely on theoretical assumptions for rate constants to determine the amount of OH radicalmediated oxidation. Problems arise because simplifications, such as using a universalrate constant for dissolved organic carbon as a surrogate for natural organic matter (NOM), are utilized in thesemodels.The RsubOH,UV/sub concept, defined as the experimentally determined OH radical exposure perUV Fluence for a given water matrix and [Hsub2/subOsub2/sub]i, can characterize the effectiveness ofUV/Hsub2/subOsub2/sub AOP within a specific water matrix. The probe compound utilized toinvestigate the RsubOH,UV/sub concept is para-Chlorobenzoic Acid (pCBA), and was chosen dueto the widespread use of this compound to characterize other AOPs (Elovitz and vonGunten 1999, Pines and Reckhow 2003, and Han et al, 2002). RsubOH,UV/sub is developedsimilar to the RsubCt/sub concept (Elovitz and von Gunten, 1999) used in ozone studies, and afull derivation of the concept can be found in Rosenfeldt and Linden, 2007). The RsubOH,UV/sub provides insight about the effectiveness of advanced oxidation in a watermatrix, and can be utilized to model the destruction of micropollutants of concern in thewater. Includes 9 references, table, figure.

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Edition: Vol. - No. Published: 11/01/2007 Number of Pages: 9File Size: 1 file , 180 KB