IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 94 NOM and Aquatic Systems Thursday, 27 August 2026 / Hall C SL43 From NOM to High Molecular Weight Aromatic DBPs and then to Aliphatic DBPs during Chlorine Disinfection Xiangru Zhang Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, China Chlorine disinfection is one of the ten greatest public health achievements of the past century, yet chlorine reacts with natural organic matter (NOM) in source water to produce innumerable halogenated disinfection by-products (DBPs) in drinking water treatment. In this presentation, I will first introduce a study that incorporated radioactive 36Cl into Suwannee River fulvic acid to label and characterize high-molecularweight chlorine-containing DBPs. I will then introduce a novel precursor ion scan method that led to the discovery of aromatic DBPs. Finally, I will present how NOM is converted to non-halogenated aromatic DBPs, then to halogenated aromatic DBPs and ultimately to halogenated aliphatic DBPs during chlorine disinfection.
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