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, so that cations in the water to be treated are electrolytically precipitated on the negative electrodes to thereby purify the water to be treated, wherein titanium is used as the positive electrodes, aluminum or an aluminum alloy is used as the negative electrodes, and electric current is flown between the electrodes in an amount large enough for applying a voltage that is capable of dielectrically breaking down an anodically oxidized film formed on the surfaces of the positive electrodes.
1 Assignment
0 Petitions
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 cooling water by applying a DC voltage across opposing electrodes while flowing water to be treated therebetween, so that ions in the water are electrically precipitated on the surfaces of the negative electrodes, thereby purifying the water to be treated, titanium is used as the positive electrodes, aluminum or an aluminum alloy is used as the negative electrodes, electric current is flown between the electrodes in an amount large enough to apply a voltage capable of dielectrically breaking down an anodically oxidized film formed on the surfaces of the positive electrodes, and the scale generated and adhered on the negative electrodes is automatically peeled off and removed by electrolytic corrosion of the negative electrodes.
-
Citations
15 Claims
- 1. A method of purifying water by applying a DC voltage across opposing electrodes while flowing water to be treated therebetween, so that cations in the water to be treated are electrolytically precipitated on the negative electrodes to thereby purify the water to be treated, wherein titanium is used as the positive electrodes, aluminum or an aluminum alloy is used as the negative electrodes, and electric current is flown between the electrodes in an amount large enough for applying a voltage that is capable of dielectrically breaking down an anodically oxidized film formed on the surfaces of the positive electrodes.
- 7. An apparatus for purifying water comprising an electrolytic vessel for receiving and draining water to be purified, one or more first electrodes disposed in the electrolytic vessel, one or more second electrodes disposed in the electrolytic 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 comprise titanium, the second electrodes comprise aluminum or an aluminum alloy, the first electrodes are connected to the positive output terminal of the DC source, the second electrodes are connected to the negative output terminal of the DC source, and electric current is flown large enough to apply a voltage for peeling and removing an anodically oxidized film formed on the surfaces of the first electrodes by dielectric breakdown.
Specification