Why to add excess lime and ...

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Why to add excess lime and looking a process to recover back? Just add a little lime to raise the pH above neutral. There is no lower limit for Ca in the drinking water and hence excess addition is not at all required.

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First we acidify the Distillate with CO2 injection and then add Lime water for calcium hardness addition and we have a regulation to have a minimum of 50ppm calcium hardness.The lime saturators produce the Lime water from the Lime milk which is the solution of water and  Hydrated Lime by continuous recirculation and also constant feeding of Lime milk and bleeding of Lime sludge.So there is no excess addition as the target is to meet 50ppm calcium hardness 

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