Although filtration devices are already widely used for stormwater runoff treatment, there are much to be improved to ensure the required performance. Additionally, the performance of a device should be verified before on-site installation. In this context, an upflow filtration system using novel high porosity floating fibrous media formed into spherical shape was proposed and evaluated for solid capture and backwashing. At filtration velocities of 20-40 m/h, the maximum head loss was about 2 cm even under a solid load of 30 kg/m2, and suspended solid (SS) removal efficiency was >96% throughout 300 minutes. A considerable amount of SS was removed in the pretreatment chamber, so the load on the media was reduced. Several models were tried to describe the solid capture in the media. The coefficients of solid attachment/detachment showed good correlations with filtration velocity. Other parameters indicated a variation of solid capture and permeability, which is unique to the media in this study. The backwashing with air and water for 1-2 minutes each showed good head loss recovery under the SS load up to 550-600 kg/m2, and the SS discharge was more efficient when the stagnant water was drained before water backwashing. The results in this study suggest the high potential of the combination of fibrous media and upflow filtration system for the efficient control of the nonpoint source pollutants in stormwater runoff.

中文翻译：

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使用新型漂浮纤维介质的上流式雨水过滤系统的固体去除评估和反冲洗优化

虽然过滤设备已经广泛用于雨水径流处理，但仍有许多需要改进以确保所需的性能。此外，应在现场安装之前验证设备的性能。在这种情况下，提出了一种使用新型高孔隙率浮动纤维介质形成球形的上流式过滤系统，并评估了固体捕获和反冲洗。在 20-40 m/h 的过滤速度下，即使在 30 kg/m2 的固体负载下，最大水头损失约为 2 cm，并且在 300 分钟内悬浮固体 (SS) 去除效率 >96%。在预处理室中去除了大量的 SS，因此减少了介质上的负载。尝试了几种模型来描述媒体中的固体捕获。固体附着/脱离系数与过滤速度显示出良好的相关性。其他参数表明固体捕获和渗透率的变化，这是本研究中的介质所独有的。空气和水各1-2分钟的反洗在SS负荷高达550-600 kg/m2下显示出良好的水头损失恢复，并且在水反洗之前排干积水时SS排放更有效。本研究的结果表明，纤维介质和上流式过滤系统的组合在有效控制雨水径流中的非点源污染物方面具有很高的潜力。空气和水各1-2分钟的反洗在SS负荷高达550-600 kg/m2下显示出良好的水头损失恢复，并且在水反洗之前排干积水时SS排放更有效。本研究的结果表明，纤维介质和上流式过滤系统的组合在有效控制雨水径流中的非点源污染物方面具有很高的潜力。空气和水各1-2分钟的反洗在SS负荷高达550-600 kg/m2下显示出良好的水头损失恢复，并且在水反洗之前排干积水时SS排放更有效。本研究的结果表明，纤维介质和上流式过滤系统的组合在有效控制雨水径流中的非点源污染物方面具有很高的潜力。