We developed a novel fiber filtration system, which allows the filter bed packing density to be adjusted, to treat raw water of differing turbidities without coagulants. A bench-scale fiber filter is used to remove 5–20 μm poly(methyl methacrylate) particles with high efficiency, without the use of coagulants. The obtained data are analyzed using Yao’s model and regression models. The first filtration cycle achieved a benchmark removal efficiency of 90 % of 5 μm particles for 71 min with a Darcy velocity of 38.2 m/h. Each cycle included a backwash process, but the filtration time gradually decreased to about 46 min by the 5th cycle. However, pressure loss did not increase significantly during the filtration cycles. The shortening duration of filtration over operating successive cycles was postulated as residual particles remaining in the bed after backwash and rinsing. We measured pressure loss at various Darcy velocities for fiber filters with different packing densities and found that the square term of Darcy velocity in Ergun’s model was significant by the regression analysis. Based on the experimental results of the novel fiber filtration system, we compare the performance and running cost of a conventional fiber filtration system and a rapid sand filtration system. The novel fiber filtration system comprising 940 mm fiber filter elements at a packing density of 110 g/L removed 96 % of 5 μm particles at a Darcy velocity about four times greater than that of the rapid sand filter. The running cost of the novel fiber filter was estimated to be approximately one-sixth that of the conventional fiber filter using poly aluminum chloride and less than approximately 30 % of the sand filter.

我们开发了一种新型纤维过滤系统，可以调节滤床填充密度，在不使用混凝剂的情况下处理不同浊度的原水。实验室规模的纤维过滤器用于高效去除 5-20 μm 聚（甲基丙烯酸甲酯）颗粒，而无需使用凝结剂。使用姚氏模型和回归模型分析获得的数据。第一个过滤循环以 38.2 m/h 的达西速度在 71 分钟内实现了 90% 的 5 μm 颗粒的基准去除效率。每个循环包括一个反冲洗过程，但过滤时间逐渐减少到第 5 个循环的 46 分钟。然而，在过滤循环期间压力损失没有显着增加。操作连续循环中过滤持续时间的缩短被假定为在反洗和漂洗后残留在床中的残留颗粒。我们测量了不同填充密度的纤维过滤器在不同达西速度下的压力损失，发现 Ergun 模型中达西速度的平方项通过回归分析是显着的。基于新型纤维过滤系统的实验结果，我们比较了传统纤维过滤系统和快速砂滤系统的性能和运行成本。新型纤维过滤系统包括 940 毫米纤维过滤元件，填充密度为 110 克/升，以比快速砂滤器大四倍的达西速度去除 96% 的 5 微米颗粒。