Compute the quantities of chemicals for split treatment of the water described in Problem 7-67 based on a magnesium hardness m the finished water of 40 mg/l and maximum total hardness of 100 mg/l. [Answers excess lime softening of two-thirds of the raw flow; 160 mg/l finished hardness = 40 (Mg) + 60 (Ca) = 100 mg/l]
Problem 7-67:
Analyze split-treatment softening for the following water analysis. Provide excess lime treatment for two-thirds of the raw water flow and by-pass one-third of the flow. Draw a bar graph of the raw water and finished water after sedimentation and filtration.
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