Method of purifying water and apparatus therefor
First Claim
1. A method of purifying water by applying a DC voltage across opposing electrodes while flowing water to be treated therebetween to thereby flow electric current between the electrodes, so that cations in the water to be treated are precipitated on the surfaces of electrodes on the negative pole side to thereby purify the water to be treated, wherein the opposing electrodes comprise titanium and the electrodes have an oxide film preformed by heating having a thickness of 5 nm to 130 nm on the surfaces thereof, 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.
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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.
12 Citations
15 Claims
- 1. A method of purifying water by applying a DC voltage across opposing electrodes while flowing water to be treated therebetween to thereby flow electric current between the electrodes, so that cations in the water to be treated are precipitated on the surfaces of electrodes on the negative pole side to thereby purify the water to be treated, wherein the opposing electrodes comprise titanium and the electrodes have an oxide film preformed by heating having a thickness of 5 nm to 130 nm on the surfaces thereof, 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.
- 9. An apparatus for purifying circulating water comprising 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 to the first electrodes, and a DC source for applying a DC voltage across the first electrodes and the second electrodes, wherein the first electrodes and the second electrodes both comprise titanium, an oxide film is preformed by heating having a thickness of 5 nm to 130 nm on at least either the first electrodes or the second electrodes connected to the positive pole side, and the DC source is a regulated DC power supply which supplies a voltage of peeling and removing, by dielectric breakdown, the oxide film formed on the surfaces of electrodes which are the first electrodes or the second electrodes that are connected to the positive pole side.
Specification
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- Resources
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Current AssigneeKoganei Corporation
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Original AssigneeKoganei Corporation
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InventorsNakano, Takayuki
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current204/550
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CPC Class CodesC02F 1/4602 for prevention or eliminati...C02F 2001/46138 Electrodes comprising a sub...C02F 2001/46152 characterised by the shape ...C02F 2103/023 Water in cooling circuitsC02F 2201/46125 Electrical variablesC02F 2201/4617 DC onlyC02F 2209/05 Conductivity or salinityC02F 2303/14 Maintenance of water treatm...F28B 9/06 with provision for re-cooli...F28F 25/00 Component parts of trickle ...
