不同的净水工艺中常用的快滤池滤料糍径见表8.3。 TABLE 8.3 Typical Grain Sizes for Different Applications Effective sIZC, mm depth,m A. Common U.S. Practice After Coagulation and settling 1. Sand alone 0.45-055 060.7 2. Dual media 091.1 060.9 Add anthracite(. 1 to 0. 7 of bed) 3. Triple media 0.20.3 0.7-1.0 Add gamet(. 1 m) B. U.S Practice for Direct Filtration Practice not well established with seasonal diatom blooms. use coarser top size. Dual-media or deep mono-medium, 1.5-mm ES C. U.S. Practice for Fe and mn filtration 1. Dual media similar to A-2 above 2. Single me dium <8 060.9 D. Coarse Single-Mediwwn Filters Washed with Air and Water Simultaneously 1. For coagulated and settled water 0.910 091.2 2. For direct filtration 1416 3. For Fe and Mn removal 1-2 153不同的净水工艺中常用的快滤池滤料粒径见表8.3