Settled water after excess-lime treatment, before recarbonation and filtration, contains 35 mg/1 of CaO excess lime in the form of hydroxyl ion, 30 mg/1 of CaC03 as carbonate ion, and 10 mg/l as CaC03 of Mg(OH)2 in the form of hydroxyl ion. First-stage recarbonation precipitates the excess lime as CaC03 for removal by sedimentation, and second-stage recarbonation converts a portion of the remaining alkalinity to bicarbonate ion. Calculate the carbon dioxide needed to neutralize the excess lime and convert half of the alkalinity in the finished water to the bicarbonate form. Assume an excess of 20% of the calculated C02 is required to account for unabsorbed gas escaping from the recarbonation chamber.
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