The effects of selected preoxidation strategies on I-THM formation and speciation |
| |
| Authors: | Darryl B Jones Hocheol Song Tanju Karanfil |
| |
| Affiliation: | a Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, USA
b Department of Environment and Energy, Sejong University, 98 Gunja-dong, Gwnagjin-gu, Seoul 143-747, South Korea |
| |
| Abstract: | In this study, the impacts of three preoxidation strategies i.e., using potassium permanganate (KMnO4), chlorine dioxide (ClO2), or hydrogen peroxide (H2O2)] before preformed monochloramine (NH2Cl) addition on the formation and speciation of iodinated trihalomethanes (I-THMs) were evaluated at the Br−/I− mass ratio of 10 in two natural waters. The effects of preoxidant dose, Br−/DOC, and I−/DOC ratio were investigated. Preoxidation with KMnO4 increased I-THM formation due to an increase in iodoform (CHI3) and brominated I-THM (CHBrClI, CHBrI2, CHBr2I) formation. In contrast, preoxidation with ClO2 sometimes reduced I-THM formation, primarily due to a reduction in CHI3 formation. Preoxidation with H2O2 had no effect on I-THM formation or speciation. I-THM formation from each preoxidant alone was considerably less than the formation from NH2Cl. Overall, preoxidant type, preoxidant/DOC, preoxidant/I−, and I−/DOC ratios are the important factors that water utilities should evaluate when assessing the impact of preoxidation for controlling I-THM formation. |
| |
| Keywords: | I-THM THM Bromide Iodide NOM Preoxidation Potassium permanganate Chlorine dioxide Hydrogen peroxide Monochloramine |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ |
|
