Consider a typical settling tank of 10 m diameter and 10 mheight. Inlet pipe is approximately 2 m deep from the top of thetank. Perform following preliminary calculations. a. For awater-sand flowrate of 1500 m 3 /hr with 1000 ppm of sand,calculate sand particle size than can be settled in the tank.(Water: density = 1000 kg/m3 , viscosity = 1 cP; Sand: density =2500 kg/m3 ) (6-marks) b. Consider settling of different sizes (50,100, 200, 300 µm), calculate required tank size for settling ofeach particle size at a constant inlet flow rate of 1500 m3 /hr.(4-marks) c. Now consider settling of 50 µm size particles in thetank with diameter of 10 m and height of 10 m, calculate inlet flowrate required, (2-marks) d. For fine particles ( 50 µm), if tanksize required to operate at 1500 m3 /hr is very large, suggestdesign modification to settle the fine particles. (4-marks)
