A setlling chamber is used to remove sand and grit from the influent water to a wastewater treatment plant. Conditions are: Chamber Height = 3m Chamber Width = 2m Chamber Length = 7m Water Flow Rate = 0.5m3/min Particle Density = 2.65g/cm3 a) What is the minimum settling velocity required for a particle to be required for a particle to be removed by this setlling chamber? Express your answer in units of cm s-1. b) Assume that this or another setlling chamber removes all particles having settling velocities greater or equal to 0.04 cm s-1. What is the minimum particle diameter that would b e entirely removed by such a setlling chamber? Express your answer in units of micrometers. (For part (b), assume the particle being removed is approximately spherical, and the water is at 22°C (density = 997.7 kg/m3, dynamic viscosity = 0.957x10-3 kgm-1s-1). If you use Stoke’s law as part of your solution, be sure to use the Reynolds number to confirm you are in the laminar flow range.)
A setlling chamber is used to remove sand and grit from the influent water to a wastewater treatment plant. Conditions are:
Chamber Height = 3m
Chamber Width = 2m
Chamber Length = 7m
Water Flow Rate = 0.5m3/min
Particle Density = 2.65g/cm3
a) What is the minimum settling velocity required for a particle to be required for a particle to be removed by this setlling chamber? Express your answer in units of cm s-1.
b) Assume that this or another setlling chamber removes all particles having settling velocities greater or equal to 0.04 cm s-1. What is the minimum particle diameter that would b e entirely removed by such a setlling chamber? Express your answer in units of micrometers.
(For part (b), assume the particle being removed is approximately spherical, and the water is at 22°C (density = 997.7 kg/m3, dynamic viscosity = 0.957x10-3 kgm-1s-1). If you use Stoke’s law as part of your solution, be sure to use the Reynolds number to confirm you are in the laminar flow range.)
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