|Alternative Title||Kinetic and mechanistic aspects of Se(IV) and I¯ oxidation: Relevance to drinking water treatment and distribution|
|Place of Conferral||北京|
|Keyword||亚硒酸根 Selenite Iodide Oxidation/disinfection Disinfection By-products Drinking Water Distribution Pipes 碘离子 氧化/消毒 消毒副产物 饮用水 输配管网|
水源地的原水常含有微量的亚硒酸盐[SeO32−，Se(IV)]和碘离子（I¯）等无机阴离子，在氧化/消毒过程中易与天然有机物（Natural organic matter，NOM）反应产生相应的消毒副产物（Disinfection by-products，DBPs），如硒酸盐[SeO42−，Se(VI)]和碘代DBPs（Iodinated disinfection by-products，I-DBPs）。近来，DBPs的生成问题已成为饮用水处理领域的研究热点之一，因此，探索这些无机阴离子在饮用水处理及输配过程中的转化动力学与机制，可为全过程评估DBPs 的生成及健康风险提供理论依据和技术支持。
Trace inorganic aions, such as selenite [SeO32, Se(IV)] and iodide (I¯) ions, are naturally present in drinking water sources, which can react with natural organic matte to generate disinfection by-products (DBPs) such as selenate [SeO4 2, Se(VI)] and iodinated DBPs (I-DBPs) during water disinfection/oxidation processes. Recently, the formation of DBPs has become one of the research hotspots in the field of drinking water treatment. Consequently, exploring the transformation kinetics and mechanisms of trace inorganic aions during water treatment and distribution will provide theoretical basis and technical support for evaluating the formation of DBPs and their health risks.
In natural waters, dissolved inorganic selenium (Se) occurs primarily as a combination of Se(IV) and Se(VI). Se(IV) has a higher bioavailability and is approximately 5–10 times more toxic than Se(VI). We investigated the reaction kinetics and mechanisms of Se(IV) with typical water oxidants/disinfectants [i.e.,hypochlorous acid (HOCl), hypobromous acid (HOBr), monochloramine (NH2Cl), ozone (O3), potassium permanganate (KMnO4), and hydrogen peroxide (H2O2)], and developed the relevant kinetic models as well. Results indicate that all the reactions followed the pseudo-first-order kinetics with excessive oxidant at pH 7.0, and the
Because water distribution pipes usually have lead-containing corrosion products (main component PbO2), we investigated the effects of pH, I¯ and PbO2 concentrations on the oxidation kinetics of I¯ by PbO2 and the I-DBPs formation. Results indicated that the oxidation of I¯ by PbO2 was a multi-order reaction, whose rate could be expressed by the following equation: R = 6.92 × 109 × [Surface area of PbO2]0.67 × [I¯]2.19 × [H+]0.59. The reaction rate decreased with increaseing pH. I2 was
|刘绍刚. 饮用水处理及输配过程中亚硒酸根和碘离子的氧化动力学与机制研究[D]. 北京. 中国科学院生态环境研究中心,2018.|
|Files in This Item:|
|刘绍刚-饮用水氧化与输配过程中亚硒酸根和（1521KB）||学位论文||开放获取||CC BY-NC-SA||Application Full Text|
|Recommend this item|
|Export to Endnote|
|Similar articles in Google Scholar|
|Similar articles in Baidu academic|
|Similar articles in Bing Scholar|
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.