Fate and transformation of iodine species during Mn(VII)/sulfite treatment in iodide-containing water
© 2022 Water Environment Federation.
| Veröffentlicht in: | Water environment research : a research publication of the Water Environment Federation. - 1998. - 94(2022), 9 vom: 06., Seite e10788 |
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| Weitere Verfasser: | , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2022
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| Zugriff auf das übergeordnete Werk: | Water environment research : a research publication of the Water Environment Federation |
| Schlagworte: | Journal Article disinfection by-products hypoiodous acid iodide pre-oxidation sulfite Iodates Iodides Iodine Compounds Oxidants mehr... |
| Zusammenfassung: | © 2022 Water Environment Federation. During oxidative treatment of iodide (I- )-containing waters, I- is easy to be oxidized into hypoiodous acid (HOI) by various oxidants and the further reaction of HOI with organic compounds can lead to the formation of iodinated disinfection by-products (I-DBPs). Oxidation of HOI to iodate (IO3 - ) or reduction of HOI to I- has been proposed to reduce the formation of I-DBPs. Because the reaction of HOI with sulfite proceeds rapidly, this study examined the fate of iodine and the formation of I-DBPs in Mn(VII)/sulfite process. Results showed that I- was oxidized to HOI but the further formation of IO3 - was suppressed due to the fast reduction of HOI to I- by sulfite. The reactions of HOI with SO3 2- and IO- with SO3 2- are the major pathways with species-specific second-order rate constants determined to be 1.12 × 105 M-1 s-1 and 9.43 × 107 M-1 s-1 , respectively. The rapid reaction of HOI with sulfite plays an essential role in minimizing the formation of iodinated products in HOI- and phenol-containing solutions. The toxic risk analysis showed that the toxicity of the generated DBPs from Mn(VII)/sulfite pre-oxidation followed by chlorination only changed slightly. PRACTITIONER POINTS: The decay of I- was negligible in Mn(VII)/sulfite process. The rapid reaction of HOI with SO3 2- resulted in the negligible generation of IO3 - . Mn(VII)/sulfite process exerted slight influence on the formation of I-DBPs. Mn(VII)/sulfite process is promising for the pretreatment of I- -containing water |
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| Beschreibung: | Date Completed 28.09.2022 Date Revised 28.09.2022 published: Print Citation Status MEDLINE |
| ISSN: | 1554-7531 |
| DOI: | 10.1002/wer.10788 |