Method of purifying water and apparatus therefor
First Claim
1. A method of purifying water comprising:
- applying a DC voltage across first electrodes and second electrodes opposing the first electrodes by a DC source having a positive pole and a negative pole, while flowing water to be treated therebetween to flow electric current between the first electrodes and the second electrodes to precipitate cations in the water to be treated on surfaces of the first electrodes or the second electrodes connected to the negative pole of the DC source to purify the water to be treated, wherein the first electrodes and the second electrodes comprise titanium and have an oxide film preformed by heating and having a thickness of 5 nm to 130 nm on the surfaces of the first electrodes and the second electrodes; and
applying the DC voltage sufficiently so that the electric current is flown between the first electrodes and the second electrodes to dielectrically break down the oxide film on the surfaces of the first electrodes and the second electrodes on the positive pole of the DC source.
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Accused Products
Abstract
A method of purifying cooling water which requires the lowest maintenance and management cost without the need for a cumbersome cleaning operation for removing scale in an electrolytic purifying vessel by taking out the electrodes from the electrolytic purifying vessel, and an apparatus therefor are provided. In the method of purifying circulating cooling water by applying a DC voltage across opposing electrodes while flowing water to be treated therebetween, so that ions in the water are electrolytically precipitated on the surfaces of electrodes on the negative pole side, thereby purifying the water to be treated, the electrodes comprise titanium and have an oxide film preformed by heating having a thickness of 5 nm to 130 nm thereon, and electric current is flown between the electrodes in an amount large enough to apply a voltage capable of dielectrically breaking down the oxide film on the surfaces of electrodes on the positive pole side.
15 Citations
15 Claims
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1. A method of purifying water comprising:
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applying a DC voltage across first electrodes and second electrodes opposing the first electrodes by a DC source having a positive pole and a negative pole, while flowing water to be treated therebetween to flow electric current between the first electrodes and the second electrodes to precipitate cations in the water to be treated on surfaces of the first electrodes or the second electrodes connected to the negative pole of the DC source to purify the water to be treated, wherein the first electrodes and the second electrodes comprise titanium and have an oxide film preformed by heating and having a thickness of 5 nm to 130 nm on the surfaces of the first electrodes and the second electrodes; and applying the DC voltage sufficiently so that the electric current is flown between the first electrodes and the second electrodes to dielectrically break down the oxide film on the surfaces of the first electrodes and the second electrodes on the positive pole of the DC source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for purifying circulating water comprising:
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a purifying vessel for receiving and draining water to be purified, one or more first electrodes disposed in the purifying vessel, one or more second electrodes disposed in the purifying vessel maintaining a predetermined gap from the first electrodes, and a DC source having a positive pole and a negative pole for applying a DC voltage across the first electrodes and the second electrodes, wherein the first electrodes and the second electrodes both comprise titanium and an oxide film having a thickness of 5 nm to 130 nm is preformed by heating on at least the first electrodes or the second electrodes connected to the positive pole of the DC source, wherein the DC source is a regulated DC power supply configured to supply a voltage sufficient for peeling and removing, by dielectric breakdown, the oxide film formed on the surfaces of the first electrodes or the second electrodes that are connected to the positive pole of the DC source. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification