Consider a suspension of sand (s = 1.01) in water at 10C with a uniform particle size (d = 0.10 mm). Flow is 0.5 Mgal/day. (1). Calculate the grit chamber surface (horizontal cross section) for obtaining removal of 70% of the particles. (2). Suppose that instead of a uniform particle diameter, there is a distribution of diameters. Assume the same specific gravity and temperature (s = 1.01, and t = 10 C). Calculate the percent removal for each size and the overall removal efficiency. Assume that for each 100 lb of grit the following distribution of particle sizes applies:

Example 3.1. Consider a suspension of sand (s=2.65) in water at 20C with a uniform narriala firn is