I-THM Formation and Speciation: Preformed Monochloramine versus Prechlorination Followed by Ammonia Addition

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• 作者：Darryl B. Jones ; Aysenur Saglam ; Aurelien Triger ; Hocheol Song ; Tanju Karanfil
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：December 15, 2011
• 年：2011
• 卷：45
• 期：24
• 页码：10429-10437
• 全文大小：932K
• 年卷期：v.45,no.24(December 15, 2011)
• ISSN：1520-5851

文摘

An increasing number of utilities in the United States have been switching from chlorination to chloramination practices to comply with the more stringent trihalomethane (THM) and haloacetic acid (HAA) regulations. This has important implications for disinfection byproduct (DBP) formation because the reactions of chlorine and monochloramine (NH₂Cl) with natural organic matter (NOM) are not the same. In this study, iodinated trihalomethane (I-THM) formation from preformed NH₂Cl and prechlorination (at two chlorine doses and contact times) followed by ammonia addition was compared. A representative bromide/iodide ratio of 10:1 was selected and four bromide/iodide levels (ambient, 50/5 or 100/10, 200/20, and 800/80 [渭g/L/渭g/L]) were evaluated. The results showed that I-THM formation was generally lower for prechlorination as compared to preformed NH₂Cl due to the oxidation of iodide to iodate by chlorine. However, while prechlorination minimized iodoform (CHI₃) formation, prechlorination sometimes formed more I-THMs as compared to preformed NH₂Cl due to a large increase in the formation of brominated I-THM species, which were formed at much smaller amounts from preformed NH₂Cl. I-THM concentrations and speciation for the two chloramination scenarios (i.e., preformed NH₂Cl vs prechlorination followed by ammonia) depended on chlorine dose, contact time, bromide/iodide concentration, and NOM characteristics of the source water (SUVA₂₅₄).