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首页> 外文会议>2011 water quality technology conference amp; exposition: An Oasis of Ideas for a Changing Environment. >Predicting Arsenic Intrusion in a Drinking Water Distribution System: Implications for Decontamination Strategies
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Predicting Arsenic Intrusion in a Drinking Water Distribution System: Implications for Decontamination Strategies

机译：预测饮用水分配系统中的砷入侵：对去污策略的影响

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Although arsenic contamination is generally considered to be an unintended consequence ofrngroundwater disturbance, intentional or accidental introduction into drinking water is a publicrnhealth concern. The toxicity of arsenic is directly related to its oxidation state; therefore, bothrnarsenate (As(V)) and arsenite (As(III)) need to be tracked within a water distribution system inrnorder to predict public health impacts. This paper expands upon earlier work of co-authors inrnwhich a mathematical model for the adsorption of arsenic to pipe walls in water distributionrnsystems was developed. The arsenic model predicts arsenate, arsenite, and free chlorinernconcentrations in the bulk water, and adsorbed arsenic concentrations on the pipe walls. Modelrnparameters are based on bench scale data obtained from experiments performed at EPA’s Testrnand Evaluation Facility. The bench scale experimental results along with pilot scalernexperimental data from a Distribution System Simulator (DSS) pipe loop are presented.rnThe arsenic model developed from the experimental study can be used to predict the fate andrntransport of contaminants within real-world water distribution systems. In addition, the arsenicrnmodel can be used to evaluate decontamination strategies (e.g., flushing and pH-modification)rnintended to remove arsenic from the walls of pipes or other distribution system infrastructure.rnSimulation studies on real-world networks are performed to compare flushing times, andrnlocations and to investigate the benefits of different decontamination strategies in terms of thernreduction of public health impacts. The EPANET-MSX software is used for the simulation study.rnThe value of using this modeling approach in order to plan water utility decontaminationrnactivities for a wider variety of contaminants in different water distribution networks isrndiscussed.
机译：尽管通常认为砷污染是地下水扰乱的意外结果，但有意或无意将其引入饮用水仍是公共健康问题。砷的毒性直接与其氧化态有关。因此，需要在配水系统中对砷酸砷（As（V））和亚砷酸盐（As（III））进行追踪，以预测对公共健康的影响。本文在共同作者的早期工作的基础上进行了扩展，在该工作的基础上，开发了一种在水分配系统中砷吸附到管壁上的数学模型。砷模型预测了散装水中的砷，砷和游离氯浓度，以及在管壁上吸附的砷浓度。模型参数是根据从EPA的“测试与评估”设施进行的实验获得的基准规模数据得出的。给出了台式规模的实验结果以及配水系统模拟器（DSS）管道回路的中试规模实验数据。实验研究中开发的砷模型可用于预测实际配水系统中污染物的命运和迁移。此外，砷模型可用于评估旨在从管道或其他分配系统基础设施的壁上去除砷的去污策略（例如冲洗和pH值修改）。对现实网络进行模拟研究以比较冲洗时间，并研究不同去污策略在减少公共卫生影响方面的益处。 EPANET-MSX软件用于模拟研究。讨论了使用这种建模方法来计划水分配去污活性以应对不同供水网络中各种污染物的价值。

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