Environmental Engineering
2. 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?
