Problem

For the water analysis given in Problem, calculate the additions of CaO, Na2CO3, and CO2 n...

For the water analysis given in Problem, calculate the additions of CaO, Na2CO3, and CO2 needed for excess-lime softening. Sketch a bar graph for the finished water after two- stage precipitation softening by excess-lime treatment with intermediate and final recarbonation (Figure 11.13). Assume that three-quarters of the alkalinity in the finished water is in the bicarbonate form.

Problem:

Draw a milliequivalents-per-liter bar graph for the following water analysis:

calcium hardness = 185 mg/l

 alkalinity = 200 mg/l

magnesium hardness = 50 mg/l

sulfate ion = 58 mg/l

sodium ion = 23 mg/l

chloride ion = 36 mg/l

potassium ion = 20 mg/l

pH = 7.7

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