1.Use Stoke’s Law to calculate the settling velocity (m/s) of a spherical particle with a diameter of 1.0 mm and a density of 3 g/mL in water at a temperature of 30?C. The dynamic viscosity of water at 30?C is 0.798 x 10-3 N s/m2. The density of water is 995.7 kg/m3.
2.A new water treatment plant is to be constructed for treating 30 MGD. Estimate the number of filters required and calculate the area of each filter (ft2), assuming that a length-to-width ratio (L:W) of 4:1 is employed in constructing the rapid sand filters and suing a filtration rate of 6 gpm/ft2.