WATER TREATMENT PROCESS AND WATER TREATMENT SYSTEM
First Claim
1. A water treatment process comprising:
- a scale inhibitor supplying step of supplying a calcium scale inhibitor which is a scale inhibitor for inhibiting the deposition of a scale containing calcium to water to be treated containing Ca ions, SO4 ions, carbonate ions and silica;
a pH adjusting step of adjusting the water to be treated to a pH at which the silica is soluble in the water to be treated;
a demineralizing step of separating the water to be treated into concentrated water in which the Ca ions, the SO4 ions, the carbonate ions and the silica are concentrated and treated water after the scale inhibitor supplying step and the pH adjusting step; and
a crystallizing step of supplying seed crystals of gypsum to the concentrated water so that gypsum is crystallized from the concentrated water.
2 Assignments
0 Petitions
Accused Products
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).
3 Citations
20 Claims
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1. A water treatment process comprising:
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a scale inhibitor supplying step of supplying a calcium scale inhibitor which is a scale inhibitor for inhibiting the deposition of a scale containing calcium to water to be treated containing Ca ions, SO4 ions, carbonate ions and silica; a pH adjusting step of adjusting the water to be treated to a pH at which the silica is soluble in the water to be treated; a demineralizing step of separating the water to be treated into concentrated water in which the Ca ions, the SO4 ions, the carbonate ions and the silica are concentrated and treated water after the scale inhibitor supplying step and the pH adjusting step; and a crystallizing step of supplying seed crystals of gypsum to the concentrated water so that gypsum is crystallized from the concentrated water. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A water treatment system comprising:
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a scale inhibitor supplying section that supplies a calcium scale inhibitor which is a scale inhibitor for inhibiting the deposition of a scale containing calcium to water to be treated containing Ca ions, SO4 ions, carbonate ions and silica; a pH adjusting section that supplies a pH adjuster to the water to be treated to adjust the pH of the water to be treated to such a value that the silica is soluble in the water to be treated; a demineralizing section that is positioned on a downstream side of the scale inhibitor supplying section and the pH adjusting section and separates the water to be treated into concentrated water in which the Ca ions, the SO4 ions, the carbonate ions and the silica are concentrated and treated water; and a crystallizing section including a crystallizing tank that is positioned on a downstream side of the demineralizing section and crystallizes gypsum from the concentrated water and a seed crystal supplying section that supplies seed crystals of gypsum to the crystallizing tank. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification