(a) Determine the maximum displacement velocity, without the fear of…

Question

(a) Determine the maximum displacement velocity, without the fear of settled particles to be lifted up and the ratio of length to depth of the settling unit for the following particles :

(i) alum floc having $S_s = 1.1$ and diameter = $0.1$ cm, and

(ii) anthracite coal dust having $S_s = 1.5$ and diameter = $0.01$ cm. Assume a Weisbach-Darcy friction factor $f = 0.025$ and temperature of $20^{\circ}\text{C}$.

(b) Describe, with the help of neat sketch, a slow sand filter. Explain its working.