反冲水和气的流量 TABLE 8.10 Typical Water and Air-Scour Flow Rates for Backwash Systems Employing Air Scour Backwash Air rate Water rate Filter Medium Sequence scfmsf(m/h) gpmsf(m/h) Fine sand 0.5mm Es Air first 2-3(37-55) 'ater second 15(37) Fine dual and triple wAw ir first 3-4(55-73) media 1.0 mm ES ater second 15-20(37-49) anthracite Coarse dual media Air first 4-5(73-91) 1.5 mm es Air water on rising level 4-5(73-91) 10 (24) anthracite Water third 25(61) Coarse sand Air water 1st 3-4(55-73)6-7(15-17) 1.0 mm ES simultaneously Water second Same or double rate parse sand Air+ water lst 68(110-14610-12(2429) 2 mm es simultaneousl Water second Same or double rate Coarse anthracite Air+ water lst 3-5(55-91)8-10(2024) . mm es simultaneously Water second Same or double rate Water rates for dual and triple media vary with water temperature and should fluidize the bed to achieve restratification of the media. See Eg (8.7).反冲水和气的流量