Modeling the release and spreading of permanganate from aerated slow-release oxidants in a laboratory flow tank.
Modeling the release and spreading of permanganate from aerated slow-release oxidants in a laboratory flow tank.
复制标题
模拟实验室流动罐中曝气缓释氧化剂中高锰酸盐的释放和扩散。
DOI：
10.1016/j.jhazmat.2020.123719
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发表时间：
2021
影响因子：
13.6
通讯作者：
Comfort,Steve
中科院分区：
文献类型：
--
作者：
Kambhu,Ann;Li,Yusong;Gilmore,Troy;Comfort,Steve
充气缓释氧化剂是处理受污染含水层的一种相对较新的技术。推进这项技术的一个关键需求是开发一种可靠的方法来预测每个驱动点周围的影响半径（ROI）。在这项工作中，我们报告了一系列的实验室流动罐实验和数值模拟的努力，旨在预测高锰酸盐的释放和扩散充气氧化剂蜡烛（氧化剂蜡复合材料）。为了模拟现场使用的氧化剂输送系统的设计，在一系列流动罐实验中使用双筛网，其中氧化剂被放置在内筛网内，并且空气在筛网之间的差距中向上鼓泡。这种气流模式产生了一个气升泵，使水和氧化剂从外部滤网的顶部分散，并在底部吸入。使用这种设计，我们观察到，高锰酸盐扩散和投资回报率增加曝气和平流下降。一个耦合的气泡流和运输模型是能够成功地再现观察到的结果，通过模仿向上的形状和传播的高锰酸盐在各种曝气和平流速率。
Aerated, slow-release oxidants are a relatively new technology for treating contaminated aquifers. A critical need for advancing this technology is developing a reliable method for predicting the radius of influence (ROI) around each drive point. In this work, we report a series of laboratory flow tank experiments and numerical modeling efforts designed to predict the release and spreading of permanganate from aerated oxidant candles (oxidant-wax composites). To mimic the design of the oxidant delivery system used in the field, a double screen was used in a series of flow tank experiments where the oxidant was placed inside the inner screen and air was bubbled upward in the gap between the screens. This airflow pattern creates an airlift pump that causes water and oxidant to be dispersed from the top of the outer screen and drawn in at the bottom. Using this design, we observed that permanganate spreading and ROI increased with aeration and decreased with advection. A coupled bubble flow and transport model was able to successfully reproduce observed results by mimicking the upward shape and spreading of permanganate under various aeration and advection rates.