Calculate the waste sludge produced in the excess lime treatment described in Problem 7-69 in units of pounds of dry solids per million gallons of water processed and gallons per million gallons assuming a settled solids concentration of 10 percent. (Answers . 5900 lb/mil gal, 70 gal/mil gal)
Problem 7-69:
A groundwater supply has the following analysis:
Calculate the quantities of lime and soda as for excess lime softening and the carbon dioxide reacted for neutralization by two-stage recarbonation. Assume the practical limits of hardness removal for calcium to be 30 mg/l and magnesium to be 10 mg/l, and three quarters of the final alkalinity is converted to bicarbonate. Sketch the bar graphs for the raw and finished waters.
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