Water treatment process and water treatment system
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United States of America Patent
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Apr 24, 2018
Issued Date -
N/A
app pub date -
Mar 30, 2015
filing date -
Jul 5, 2013
priority date (Note) -
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Abstract
In a water treatment system (1) and a water treatment process, a scale inhibitor is supplied to water to be treated containing Ca ions, SO4 ions, carbonate ions, and silica, and the water to be treated is adjusted to a pH at which silica is soluble. The pH-adjusted water to be treated containing the calcium scale inhibitor is separated in a demineralizing section (10) into concentrated water and treated water. In a crystallizing section (20), seed crystals of gypsum are supplied to the concentrated water, whereby gypsum is crystallized and removed. Silica in the water to be treated is removed from the concentrated water on the downstream side of the crystallizing section (20). Calcium carbonate in the water to be treated is removed from the concentrated water on the upstream side of the demineralizing section (10) or the downstream side of the crystallizing section (20).
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