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- W4304687946 abstract "• The ZVI/PMS process accelerated the degradation of IPM. • The ZVI/PMS process significantly decreased the I-THMs formation potential. • Fe 3+ further enhance the removal of IPM by the ZVI/PMS process. • Fe 3+ further reduced the formation of I-DBPs from disinfection of IPM via ZVI/PMS. The traditional coagulation process in drinking water treatment cannot effectively remove the organic precursors of highly toxic iodinated disinfection by-products (I-DBPs). This study proposes a combination of zero-valent iron (ZVI) and peroxymonosulfate (PMS) to remove the organic precursor of I-DBPs during the coagulation stage. This study investigated the degradation of iopamidol (IPM), a typical organic precursor of I-DBPs, by the combination of ZVI/peroxymonosulfate (PMS) and the influence on the generation of I-DBPs during disinfection. IPM was effectively decomposed by ZVI/PMS, because of the formation of hydroxyl (HO • ) and sulfate (SO 4 •− ) radicals. SO 4 •− was a major contributor (>64.7%) to the degradation. The anions (Cl − and SO 4 2− ) in the conventional coagulants have a weak effect on the removal of IPM by the ZVI/PMS process, while the common cations (Fe 3+ ) further enhance the removal of IPM by the ZVI/PMS process. The formation of I-THMs was obviously decreased during the chlorination of IPM in the presence of the ZVI/PMS process (14.4 μg L −1 ) compared to that in the presence of the ZVI process (258.1 μg L −1 ) and the chlorination alone process (29.7 μg L −1 ). The formation of I-THMs was increased by more than 1.7-fold in the presence of natural organic matter (NOM). The presence of Fe 3+ further reduced the formation of I-DBPs to below the limit of quantitation (LOQ). Therefore, it is feasible to use the ZVI/PMS process to degrade IPM in the coagulation stage of drinking water treatment, and it can also reduce the I-DBPs formed by subsequent disinfection." @default.
- W4304687946 created "2022-10-12" @default.
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- W4304687946 date "2023-02-01" @default.
- W4304687946 modified "2023-10-10" @default.
- W4304687946 title "Fe3+-enhanced zero valent iron/peroxymonosulfate (ZVI/PMS) process for the transformation of iopamidol during coagulation and reduction of iodinated disinfection by-products" @default.
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- W4304687946 doi "https://doi.org/10.1016/j.cej.2022.139723" @default.
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