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For a dual-media filter with 0.5 m of anthracite coal and 0.3 of sand. Other data...

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Civil Engineering

For a dual-media filter with 0.5 m of anthracite coal and 0.3 ofsand. Other data for anthracite: specific gravity is 1.67, porosityis 0.5, d90 grain size is 1.5 mm. Other data for sand:specific gravity is 2.65, porosity is 0.4, d90 grainsize is 0.9 mm. The water temperature is 20C, so the mass densityof water (ρ) is 998.2 kg/m3 , density of sand is 1650kg/m3 , density of anthracite coal is 1506kg/m3, the absolute viscosity is 1.002 x 10-3kg/m-s. Assuming a 30% margin of safety for backwash, calculate thefollowing:

a) the recommended backwash rate for the filter (gpm/sf)

b) the pressure drop through the filter during fluidization(psi)

Note: multiply (L/m2-s) by 1.473 to get gpm/sf.Multiply (N/m2) by 0.000145 to get psi.

Answer & Explanation Solved by verified expert
3.7 Ratings (607 Votes)
Ans a We knowVb 113569 00408Gn050 d90 337 d90where viscosity density ofwater Gn Galileo number d90    See Answer
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