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首页> 外文期刊>Water >A Laboratory Study on the Filtration and Clogging of the Sand-Bottom Ash Mixture for Stormwater Infiltration Filter Media
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A Laboratory Study on the Filtration and Clogging of the Sand-Bottom Ash Mixture for Stormwater Infiltration Filter Media

机译：雨水入渗滤料中砂灰混合料的过滤与堵塞实验研究

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摘要

The performance of stormwater infiltration systems depends significantly on the infiltration/filtration characteristics of filter media. Sand media have been frequently used due to their abundance and acceptable pollutant removal efficiency. Bottom ash media, which was known to have a high sorption capacity, are being considered as alternative and/or complement filter media to enhance the overall treatment efficiency. To verify the applicability of bottom ash as filter media, a series of 1-D column infiltration tests were conducted in this study. The filtration and clogging characteristics of the sand-bottom ash mixtures at different mixing ratios were investigated with limitedly focusing on the Total Suspended Solids (TSS) present in stormwater runoff. As a result, the presence of bottom ash was identified to improve the TSS removal efficiency in spite of having a significant increase in clogging potential. All media configurations were observed to experience the premature clogging and the clogging state for varying and constant head flow conditions, respectively. The noticeable amount of crushed bottom ash particles brought by seepage force could be accountable for the rapid occurrence of clogging phenomena. Overall, a homogeneous sand filter is preferred as long as the lifespan of filter system is the primary concern.
机译：雨水渗透系统的性能在很大程度上取决于过滤介质的渗透/过滤特性。由于沙质介质的含量丰富且污染物去除效率可以接受，因此经常被使用。被认为具有高吸附能力的底灰介质被认为是替代和/或补充过滤介质，以提高整体处理效率。为了验证底灰作为过滤介质的适用性，本研究进行了一系列的一维柱渗透测试。研究了不同混合比下的砂-底灰混合物的过滤和堵塞特性，并仅着眼于雨水径流中存在的总悬浮固体（TSS）。结果，尽管存在堵塞可能性的显着增加，但仍确认存在底灰可改善TSS去除效率。观察到所有介质配置在变化的和恒定的扬程条件下分别经历过早的堵塞和堵塞状态。渗透力带来的大量碎渣灰可能是造成堵塞现象迅速发生的原因。总体而言，均质砂滤池是首选，只要滤池系统的使用寿命是首要考虑因素。

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