期刊
WATER RESEARCH
卷 68, 期 -, 页码 394-403出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.09.040
关键词
Iodinated trihalomethanes (I-THMs); Chlorine; Chlorine dioxide; Potassium permanganate; Disinfection by-product; Water treatment
资金
- Natural Science Foundation of China in China [51278352, 41301536]
- Fundamental Research Funds for the Central Universities
- National Major Science and Technology Project of China [2012ZX07404004, 2012ZX07408001]
- National Science Council of Taiwan [NSC-102-2221-E-327-021]
This study compared the formation of iodinated trihalomethanes (I-THMs) from iodide-containing raw waters oxidized by chlorine, chlorine dioxide (ClO2) and potassium permanganate (KMnO4) at different oxidant concentrations, reaction times, pHs, initial iodide concentrations and bromide to iodide mass ratios. Among the six investigated I-THMs, iodoform was the major species formed during the oxidation using chlorine, ClO2 and KMnO4. When oxidant concentration increased from 0.1 to 3.0 mg/L, the formation of I-THMs increased and then decreased for chlorine and ClO2, but kept increasing for KMnO4. As the reaction time went by, I-THM concentration increased to a plateau within 10 h (ClO2 within only 1 h, especially) for all the three oxidants. I-THM formation gradually increased from pH 3.0 to 9.0 and remained stable at pH values higher than 7.5 for chlorine; however, for ClO2 and KMnO4 the highest I-THM formation showed at pH 7.0 and 7.5, respectively. As initial iodide concentration increased from 20 to 800 mu g/L, the total amount and species of I-THMs increased for the three oxidants. Iodide contributed to I-THM formation much more significantly than bromide. (C) 2014 Elsevier Ltd. All rights reserved.
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