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- W2806458794 abstract "Ultraviolet/hydrogen peroxide (UV/H2O2) pre-oxidation has the potential to induce reactions with dissolved organic matter (DOM) and alter the generation of disinfection byproducts (DBPs). This study evaluated the influence of UV/H2O2 pretreatment on the formation of iodo-trihalomethanes (I-THMs) during disinfection with chlorine or chloramine. The changes of precursors, I- and Br-, after UV/H2O2 pretreatment were investigated, and then, the formation and speciation of I-THMs during chlorination or chloramination after pre-oxidation were explored. Additionally, the effects of UV doses and H2O2 concentrations on the formation and speciation of I-THMs were studied. It was found that UV/H2O2 pretreatment could change larger molecular weight (MW) DOM to smaller MW species, which had less aromatic organic compounds and fluorescence substances. Additionally, insignificant transformations of I- and Br- were observed after UV/H2O2 treatment. Compared to direct disinfection, UV/H2O2 pretreatment resulted in 23.0 ± 3.5% reduction in I-THMs formation during post-chlorination while an enhancement was observed during post-chloramination at a UV dose of 460 mJ/cm2 and 20 mg/L H2O2. Moreover, total I-THM concentration increased from 43.7 ± 2.4 to 97.6 ± 14.9 nM with the increase of UV doses from 0 to 1400 mJ/cm2 during the post-chlorination process, while reduced when the UV fluence was >460 mJ/cm2 during the post-chloramination. Additionally, the generation of I-THMs during both post-chlorination and post-chloramination was positively related to the H2O2 levels from 0 to 20 mg/L in the UV/H2O2 pretreatment." @default.
- W2806458794 created "2018-06-13" @default.
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- W2806458794 date "2018-11-01" @default.
- W2806458794 modified "2023-10-05" @default.
- W2806458794 title "Formation of iodo-trihalomethanes (I-THMs) during disinfection with chlorine or chloramine: Impact of UV/H2O2 pre-oxidation" @default.
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- W2806458794 doi "https://doi.org/10.1016/j.scitotenv.2018.05.306" @default.
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