Assignment 4

Assignment 4 - have specific gravity of 2.65 and a shape...

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Due Date: 13/10/05 CIVL242: Water and Wastewater Engineering Assignment 4 1. Determine the clear-water headloss in a filter bed composed of 12 in of uniform anthracite with an average size of 1.6 mm and 12 in of uniform sand with an average size of 0.5 mm for a filtration rate of 160 L/m 2 ·min. Assume that the operation temperature is 20 o C. Use the Carmen-Kozeny for computing the headloss. Use shape factor are 0.73 and 0.82 for the anthracite and sand, respectively. The porosity of both layers is 0.4. Given: ρ=998.2 kg/m 3 , μ=1.002 x 10 -3 N·s/m 2 2. A rapid sand filter has a bed depth of 0.7 m. It is composed of sand grains that
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Unformatted text preview: have specific gravity of 2.65 and a shape factor of 0.82. The porosity of the bed is 0.45 throughout. The sieve analysis of the sand is shown below. Sieve no. Mass retained, % Average particle size, mm 14-20 0.87 1.0 20-28 8.63 0.71 28-32 21.30 0.54 32-35 28.10 0.46 35-42 23.64 0.38 42-48 7.09 0.32 48-60 3.19 0.27 60-65 2.16 0.23 65-100 1.02 0.18 Determine the head loss through the bed if the flow rate is 5.0 m/hr and the water temperature is 17 o C. Given: =998.7 kg/m 3 , =1.084 x 10-3 Ns/m 2...
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