Method of removing calcium from water containing calcium hydrogen carbonate in high concentration
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United States of America Patent
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Jun 14, 2005
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N/A
app pub date -
Jan 28, 2000
filing date -
Feb 1, 1999
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Abstract
A method for removing calcium from water containing a high concentration of calcium bicarbonate, permitting a reduction of the calcium bicarbonate equivalent to 200-500 ppm calcium to the level in accordance with the water quality standards for industrial use, not by a method using a large amount of heat and power as heating and deairing, but by a simple chemical treatment. Calcium hydroxide is added to waste water containing a high concentration of calcium in a form of calcium bicarbonate for making them react with each other, and removing calcium by fixing it to calcium bicarbonate.
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