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filtration Assignment 1

filtration Assignment 1 - Given ρ = 998.7 kg/m 3 μ=1.139...

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Due Date: 25/10/07 CIVL242: Water and Wastewater Engineering Filtration Assignment 12 A rapid sand filter with a bed depth of 60cm contains only sand that has a sieve analysis given in the accompanying table. The filter is to be operated at a loading rate of 120 m 3 /m 2 /d and temperature of 15 o C. The porosity for the filter is 0.39 and the sphericity of the particles is 0.92. Sieve no. Percentage(by weight) of sand retained mean size, mm 16-18 1.6 1.09 18-20 5.3 0.92 20-25 12.5 0.77 25-30 25.1 0.65 30-35 23.4 0.54 35-40 15.1 0.46 40-45 13.8 0.38 45-50 2.2 0.32 50-100 0.8 0.27 a) What are the effective size and uniformity coefficient for the medium? (U=d 60 /d 10 ) b) Determine the initial head loss through the medium.
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Unformatted text preview: Given: ρ = 998.7 kg/m 3 , μ=1.139 x 10-3 N·s/m 2 13 A dual-media rapid filter contains anthracite with an effective size of 0.9mm, sphericity of 0.75, porosity of 0.48, and depth of 0.40m and sand with an effective size of 0.48mm, sphericity of 0.90, porosity of 0.40m. The uniformity coefficients are 1.5 for each of the media. Perform all calculations for a temperature of 10 o C. Divide each medium into three layers on a weight basis. (a) Calculate the mintial headloss through the bed if the loading rate is 200m 3 /m 2 / d. Given: ρ = 999.7 kg/m 3 , μ=1.307 x 10-3 N·s/m 2...
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