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Application of Bottom Ash as Filter Media for Construction Site Runoff Control
Water ( IF 3.0 ) Pub Date : 2020-04-01 , DOI: 10.3390/w12040990
Ki Woong Bang , Jin Chul Joo , Jin Ho Kim , Eunbi Kang , Jongsoo Choi , Jung Min Lee , Yonghyok Kim

The potential application of bottom ash (BA) for construction site runoff control as an alternative filter media with high removal efficiency of total suspended solids (TSS) and longer operation period were evaluated. Both lab-scale single-layer and pilot-scale multi-layer filtration experiments were performed using BA filter media with different particle sizes and various volumetric flow rates. Due to the mesoporous, irregular, and spherical shape of gravel-size BA filter media used in this study, relatively low surface area, negligible pore volume, and greater pore size were observed. Both TSS removal efficiencies and clogging of BA filter media were a complex function of particle size of BA filter media and loading rate of TSS. Incoming TSS particles did not significantly penetrate beyond 46-cm BA filter media depth, accumulating on the upper layers and gradually forming a clogging layer to critical thickness, and finally the clogging filtration mechanism dominated the overall removal efficiency of TSS. Accumulation of TSS on BA filter media can be explained by the lumped sigmoidal empirical model, and an exponential decline in accumulation of TSS with depth results in minimal accumulation beneath the clogging layer. As practical implications, BA filter media depth of less than 46 cm is recommended with dual- or multi-media filters using mixtures of gravel-size BA and silt-size fine media, and a combination of detention basins can reduce frequent periodic de-clogging operation and management.

中文翻译:

底灰作为过滤介质在工地径流控制中的应用

评估了底灰 (BA) 在建筑工地径流控制中作为替代过滤介质的潜在应用,该过滤介质具有高总悬浮固体 (TSS) 去除效率和更长的运行周期。实验室规模的单层和中试规模的多层过滤实验均使用具有不同粒径和各种体积流速的 BA 过滤介质进行。由于本研究中使用的砾石大小的 BA 过滤介质具有介孔、不规则和球形形状,因此观察到相对较低的表面积、可忽略的孔体积和较大的孔径。TSS 去除效率和 BA 过滤介质的堵塞都是 BA 过滤介质的粒径和 TSS 负载率的复杂函数。进入的 TSS 颗粒没有显着渗透超过 46 厘米 BA 过滤介质深度,堆积在上层并逐渐形成堵塞层至临界厚度,最终堵塞过滤机制主导了 TSS 的整体去除效率。TSS 在 BA 过滤介质上的积累可以通过集总 sigmoidal 经验模型来解释,并且 TSS 的积累随深度呈指数下降,导致堵塞层下方的积累最小。作为实际意义,对于使用砾石大小的 BA 和淤泥大小的细介质混合物的双介质或多介质过滤器,建议使用小于 46 厘米的 BA 过滤介质深度,并且结合滞留池可以减少频繁的定期去堵塞运营和管理。TSS 在 BA 过滤介质上的积累可以通过集总 sigmoidal 经验模型来解释,并且 TSS 的积累随深度呈指数下降,导致堵塞层下方的积累最小。作为实际意义,对于使用砾石大小的 BA 和淤泥大小的细介质混合物的双介质或多介质过滤器,建议使用小于 46 厘米的 BA 过滤介质深度,并且结合滞留池可以减少频繁的定期去堵塞运营和管理。TSS 在 BA 过滤介质上的积累可以通过集总 sigmoidal 经验模型来解释,并且 TSS 的积累随深度呈指数下降,导致堵塞层下方的积累最小。作为实际意义,对于使用砾石大小的 BA 和淤泥大小的细介质混合物的双介质或多介质过滤器,建议使用小于 46 厘米的 BA 过滤介质深度,并且结合滞留池可以减少频繁的定期去堵塞运营和管理。
更新日期:2020-04-01
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