Description
Several approaches for modeling UV/H<sub>2</sub>O<sub>2</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/H<sub>2</sub>O<sub>2</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 R<sub>OH,UV</sub> concept, defined as the experimentally determined OH radical exposure perUV Fluence for a given water matrix and [H<sub>2</sub>O<sub>2</sub>]i, can characterize the effectiveness ofUV/H<sub>2</sub>O<sub>2</sub> AOP within a specific water matrix. The probe compound utilized toinvestigate the R<sub>OH,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). R<sub>OH,UV</sub> is developedsimilar to the R<sub>Ct</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 R<sub>OH,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.
Product Details
- Edition:
- Vol. – No.
- Published:
- 11/01/2007
- Number of Pages:
- 9
- File Size:
- 1 file , 180 KB
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
