AWWA WQTC65849

Several approaches for modeling UV/H₂O₂ 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/H₂O₂ 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_OH,UV concept, defined as the experimentally determined OH radical exposure perUV Fluence for a given water matrix and [H₂O₂]i, can characterize the effectiveness ofUV/H₂O₂ AOP within a specific water matrix. The probe compound utilized toinvestigate the R_OH,UV 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_OH,UV is developedsimilar to the R_Ct 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_OH,UV 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