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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.

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First Claim