Patent ID: 8226813
Filing Date: 2012-07-24
Classification: C02F,F28B,F28F

Abstract:
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.