Awastewater contains sand particles of three major sizes: 0.002 mm, 0.6 mm and 6 mm. a settling basin is designed to achieve 1005 removal of 0.6 mm diameter particles. assume water temperature is 20 °c. how much removal can be achieved for the other particle size. the specific gravity can be assumed as the same as in problem 1. chme441: basic design of physical unit processes v 1. calculate the terminal velocity of a spherical sand particle settling through water at 20 °c. the diameter of the particles is 0.6mm and specific gravity is 2.65. the density and viscosity of water are 997 kg/m' and 0.89 x 10°n. s/m. 2. a wastewater contains sand particles of three major sizes: 0.002 mm, 0.6 mm and 6 mm. a settling basin is designed to achieve 1005 removal of 0.6 mm diameter particles. assume water temperature is 20 °c. how much removal can be achieved for the other particle size. the specific gravity can be assumed as the same as in problem 1.