The removal of particulate matter (PM) by filter media during filtration process can mitigate the pavement runoff pollution effectively. However, this process also makes the filter media prone to clogging. To better understand the size ranges of PM captured by filter media and the subsequent impact on the clogging process, filtration test and clogging test were conducted on five types of filter media. The effect of layer thickness and grain size of different filter media on particle removal efficiency was evaluated, based on the results of PM removal rate and the particle size distribution. The subsequent long-term clogging characteristics of different filter media were also investigated. The results showed that filter media presented different capabilities to capture PM, which could be enhanced by less layer thickness or finer grain size. Normally, PM with the size range of over 49 μm could be captured effectively if proper layer thickness and grain size of filter media were selected. Besides, PM removal rate was not related to the clogging resistance of filter media. Though it can capture a larger amount of PM, Vesuvianite still maintained remarkable clogging resistance. The results will be beneficial to filter media selection and system design optimization for pavement runoff treatment.

中文翻译：

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路面径流处理不同滤料的颗粒物捕集及长期阻塞特性评价

在过滤过程中通过过滤介质去除颗粒物（PM）可以有效减轻路面径流污染。但是，此过程也使过滤介质易于堵塞。为了更好地了解过滤介质捕获的PM的尺寸范围及其对堵塞过程的影响，对五种类型的过滤介质进行了过滤测试和堵塞测试。根据PM去除率和粒度分布的结果，评估了不同过滤介质的层厚和粒度对颗粒去除效率的影响。随后还研究了不同过滤介质的长期堵塞特性。结果表明，过滤介质呈现出不同的捕集PM的能力，这可以通过减少层厚度或改善晶粒尺寸来增强。 μ如果选择过滤介质的适当的层的厚度和晶粒尺寸米能有效地捕获。此外，PM去除率与过滤介质的抗堵塞性无关。尽管维苏威石可以捕获大量的PM，但仍保持了出色的抗堵塞性。该结果将有利于路面径流处理的过滤介质选择和系统设计优化。