高藻进水条件下常见滤池过滤性能研究

Study on the performance of different typical filters under the influent of high algae-laden water

高藻进水条件下常见滤池过滤性能的研究可为滤池构建参数优化提供一定理论依据,为新建和改造地表水厂滤池工程提供技术支持。文章针对地表水源水厂滤池表层滤料堵塞、水头损失急剧增加和过滤周期急剧缩短问题,通过不同类型常见滤池滤柱模拟试验,研究了不同类型滤池对高藻水的抗负荷冲击能力,对比分析了其出水浊度、颗粒数分布、藻类数量、过滤周期、水头损失等变化情况。结果表明:原水预氧化、增加絮凝剂投加量方式不能使藻类在絮凝沉淀过程中得到有效去除;煤砂滤池对高藻水有较强抗负荷冲击能力,过滤周期最长,可达20 h左右;过滤初期水质较差,随时间增加出水水质提高;藻细胞主要被表层滤料黏附械留,且表层滤料对藻细胞的去除率高达97%。

The study on the performance of different typical filters under the influent of high algae- laden water may provide many basic theories and technical supports for the drinking water treatment plants＇ operation and design under the influent of high algae-laden water. In surfaced water treatment plant, a large number of algal cells flow into the filter, which can easily block the surface filtration media, cause dramatically increase water head loss and shorten the period of filter. Through simulation experiment of the different typical filter columns, the resistance load capacities of high algae water between the different typical filters were researched. This study comparatively analyzed the change in effluent water, such as the turbidity, distribution of particle number, the amount of algae, the time of filtration cycle, head loss and so on. The results indicate that coal-sand filter has strong ability to resist impact load for high algae water, and that filtering cycle hour is much longer which can amount to about 20 h ; GAC filter, gradating material filter and homogeneous sand filter have weak ability to resist impact load for high algae water with filter cycle shortened half. The initial filter water quality is poorer, but improving over time; Algal ceils are mainly adhered and intercepted by the surface filter material which removed 97% algal cells.