Settled water after excess-lime treatment, before recarbonation and filtration, contains 35 mg/l of CaO excess lime in the form of hydroxylion, 30 mg/l ft CaCO3 as carbonate ion, and 10 mg/l as CaCO3 of Mg(OH)2 in the form of hydroxyl ion. First-stage recarbonation (Eq. 7-24) precipitates the excess lime as CaCO3 for removal by sedimentation, and second- stage recarbonation (Eq. 7-25) converts a portion of the remaining alkalinity to bicarbonate ion. Calculate the carbon dioxide needed to neutralize the excess lime and convert 60 percent of the alkalinity in the finished water to the bicarbonate form. Assume an excess of 20 percent of the calculated CO2 is required to account for unabsorbed gas escaping from the recarbonation chamber.
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