What effect does removing the 100–140 sieve fraction have on the depth of the expanded b...

What effect does removing the 100–140 sieve fraction have on the depth of the expanded bed in Example 8-3 ?

Example 8-3

Determine the depth of the expanded sand filter bed being designed for Ottawa

Island ( Example 8-2 ).

Example 8-2

Estimate the clean filter headloss in Ottawa Island’s proposed new sand filter using the sand described in Example 8-1, and determine if it is reasonable. Use the following assumptions: loading rate is 216 m³/d · m² , specific gravity of sand is 2.65, the shape factor is 0.82, the bed porosity is 0.45, the water temperature is 10^oC, and the depth of sand is 0.5 m.

Example 8-1

A sand filter is to be designed for the Ottawa Island’s new water treatment plant. A sieve analysis of the local island sand is given below. Using the sand analysis, find the effective size, E, and uniformity coefficient, U.