A rectangular clarification basin is to be designed for a rapid sand filtration plant. The flow is 10 MGD, the critical settling velocity is 3 ft/hr, and the detention time is 6 hours. Determine the dimensions of the basin if the length is twice the width. A) What particle size would this critical settling velocity correspond to for a particle with a specific gravity = 2.56 settling in water at 25C? B) What particle size would this critical settling velocity correspond to if the particle had a specific gravity = 1.02 settling in water at 25C?
