Assume Stoke’s Law applies. For particles with a diameter of 0.02 mm and density of 1200 kg— what percentage of these particles will settle in the clarifier. Is your use of Stoke’s Law valid?

Environmental Engineering

Your WWTP uses a rectangular primary clarifier that is 12m wide, 24 m long, and has a water rti3 depth of 3 m. The wastewater flowrate is 5000 —da. The wastewater temperature is 20 C (so the y water viscosity is 0.001 , and the density is 998 ) m •s ni3

• a) (15) Assume Stoke’s Law applies. For particles with a diameter of 0.02 mm and density of 1200 kg— what percentage of these particles will settle in the clarifier.
• b) (10) Is your use of Stoke’s Law valid?