Kinetics of Hypohalous Acid Intermediates Governing Disinfection Byproduct Formation in Peracetic Acid-Treated Halide-Containing Waters.

ABSTRACT: Peracetic acid (PAA) has emerged as an alternative disinfectant because of its lower reactivity with natural organic matter (NOM) and minimal halogenation. However, PAA may react with halides (Br^-, I^-) in water to form hypohalous acids, which can contribute to halogenated disinfection byproduct (DBP) formation. Meanwhile, coexisting hydrogen peroxide (H₂O₂) can reduce HOBr/HOI back to halides. To assess and mitigate the DBP risks of PAA in halide-containing waters, this study investigated the oxidant change and DBP formation in PAA/halide/NOM systems. A refined kinetic model accurately simulates PAA/Br^- and PAA/Br^-/NOM reactions, revealing that a small fraction of NOM is highly reactive with HOBr and drives brominated DBP fo

SUBMITTER: Li J 

PROVIDER: S-EPMC12825158 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature