Effect of UV/Chlorine Oxidation on Disinfection Byproduct Formation from Diverse Model Compounds

• DOI: 10.1021/acsestwater.1c00418
• Publication Date: 2022-03-17T20:21:02Z
• Authors: Yanping Zhu; Chengjin Wang; Susan Andrews; Ron Hofmann
• Keywords: Haloacetic acids; Trihalomethane; Advanced oxidation process; Natural Organic Matter; Portable water purification

Disinfection byproduct (DBP) formation is a potential concern for the UV/chlorine advanced oxidation process (AOP) in water treatment. In this study, 11 model compounds were selected as natural organic matter (NOM) surrogates, including seven active DBP precursors and four poor precursors. The effect of on their UV reactor during 24 h postchlorination was investigated comparison to dark chlorination. DBPs evaluated included adsorbable halides (AOX), trihalomethanes, haloacetic acids (HAAs), haloacetaldehydes (HALs), trichloronitromethane (TCNM), dichloroacetonitrile (DCAN). AOP conducted at typical dose adopted drinking treatment both pH 6.0 7.8 with kept 7.8. For most precursors, either decreased AOX (FP) DBPFP by <25% or showed an insignificant impact. Three activated oxidation, especially 6.0, significant increase AOXFP percentage-wise, but absolute low (less than 186 μg-Cl/mg-C 50 μg DBP/mg-C). converted some chloroform HAA HAL precusors. N-containing increased TCNM DCAN formation, 6.