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A Mechanistic Modeling Approach for Elucidating the Roles of Water Quality Parameters in the Formation of Bromate in Natural Waters 阐明水质参数在天然水中溴酸盐形成中作用的机械建模方法
发布日期: 2002-11-01
由于环境污染,臭氧正在成为饮用水消毒的一种有吸引力的替代化学品 微小隐孢子虫卵囊等水媒病原体对病毒灭活的抵抗力 较弱的氧化剂,如游离氯和结合氯。然而,相对较高的臭氧剂量 失活所需的时间可能会导致形成相对较高水平的溴酸盐,一种 在含有溴离子的水中,公共卫生问题。因此,有必要提供 充分灭活病原体,同时最大限度地减少饮水过程中形成的溴酸盐 治疗本文讨论了一种通过表征溴酸盐动力学来实现这种优化的方法 通过进行有限数量的实验室规模实验,并开发 基于此动力学信息的数学工具,用于预测溴酸盐的形成。 本研究特别关注的是pH值在溴酸盐形成中的作用。实验已经完成 使用渥太华河水(ORW)(pH=6.1,TIC=2.9 mg/l,TOC=2.2x10-4 mg/l,[Br-]=20 ug/l)在不同pH水平(pH=6)下进行。 5、7.5和8.4)增加 将溴离子浓度降至600 ug/L,以测定臭氧分解和随后的溴酸盐 这种天然水的地层剖面。这些实验结果正被用来校准仪器 目前正在开发的机械模型。 包括57个参考文献、表格、图表。
Ozone is becoming an attractive alternative chemical for drinking water disinfection due to the resistance of waterborne pathogens such as Cryptosporidium parvum oocysts to inactivation by weaker oxidants such as free and combined chlorine. However, the relatively high ozone doses required for inactivation can lead to the formation of relatively high levels of bromate, a compound of public health concern, in waters containing bromide ion. It has therefore become necessary to provide adequate pathogen inactivation while minimizing the amount of bromate formed during water treatment. This paper discusses an approach to achieve such optimization by characterizing the kinetics of bromate formation by performing a limited number of laboratory-scale experiments, and developing a mathematical tool based on this kinetic information for predicting bromate formation. Of particular interest in this study is the role of pH in bromate formation. Experiments have been performed with Ottawa River Water (ORW) (pH=6.1, TIC=2.9 mg/l, TOC=2.2x10-4 mg/l, [Br-]=20 ug/l) at different pH levels (pH 6.5, 7.5 and 8.4) after increasing the concentration of bromide ion to 600 ug/L in order to determine ozone decomposition and subsequent bromate formation profiles for this natural water. These experimental results are being used to calibrate the mechanistic model currently under development. Includes 57 references, table, figures.
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发布单位或类别: 美国-美国给水工程协会
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