Calculate the quantities of waste sludges produced in softening the water described in Pro...

Calculate the quantities of waste sludges produced in softening the water described in Problem. Assume that the solids concentration of the gravity-thickened sludge from the excess lime and split-treatment processes is 8 percent and the solids concentration from selective calcium carbonate removal is 12 percent.

Problem:

Calculate for the following water analysis the lime dosage needed for softening by selective calcium removal. What is the finished water hardness?