细砂滤料的过滤性能及运行效果

基于提升滤后水水质对石英砂粒径的选用问题,通过中试研究了两种不同粒径分布的石英砂过滤性能,探讨细砂滤料使用的可行性。研究结果表明,细砂的滤后水浊度更低,能解决高浊度的突发性水质问题;细砂对无脊椎动物的截留效果显著,并能有效应对轮虫等小尺寸生物风险;细砂滤料保持并提升了滤池对有机物和氨氮的去除能力;细砂的水头损失增长更快,降低进水浊度能有效延长其运行时间;对比于其他深度处理工艺,细砂滤料拥有部分膜处理功能,无需增加净水厂用地。

Filtration Performance and Operation Effect of Fine Sand Filter

In view of selection of quartz sand particle size for improving the quality of filtered water,the filtration performance of two kinds of quartz sand with different particle size distribution was studied by pilot test,and the feasibility of using fine sand was discussed. Turbidity in water filtered by fine sand was lower,and the sudden water quality problem with high turbidity could be solved. Fine sand had a significant retention effect on invertebrate zooplankton,and could effectively deal with biological risk of small size organisms such as rotifers. The fine sand could also maintain and improve the removal capacity of organic matters and ammonia nitrogen. The head loss of fine sand increased faster,and the operation time could be effectively prolonged by reducing turbidity in influent. Compared with other advanced treatment processes,the fine sand filter had part of membrane treatment function,and did not need to increase the footprint area of a water treatment plant.