| PATENT ASSIGNEE'S COUNTRY | Canada. Japan |
| UPDATE | 08.99 |
| PATENT ASSIGNEE |
Asahi Glass Co Ltd Glegg Water Conditioning Inc |
| PATENT CLAIMS |
Production method by self-regenerating type electrodialysis - Using a deionized water-producing apparatus contg an electrodialyzer comprising cation exchange membranes & anion exchange membranes alternately arranged between an anode compartment provided with an anode & a catho de compartment provided with a cathode, demineralizing compartments compartmentalized with anion exchange membranes on the anode side & with cation exchange membranes on the cathode side, & concentrating compart ments compartmentalized with cation exchange membrane on cathode side & cation exchange membranes on catho de side, the electrodialyzer having ion exchangers accomo dated in the demineralizing compartments - Applying a voltage while supplying water to be treated to the demineralizing compartments to remove impurity ions in the water to be treated, wherein at least a part of the un treated water or already treated water is withdrawn to be added to a concentrating water for recycle, a flow amount of untreated water to be introduced into the demineralizing compartments being 2-5.5 to a flow amount of a concentra ting water to be introduced into the concentrating compart ments, a linear velocity of untreated water in the deminera lizing compartments being 0.5-7.0 cm/sec & linear velocity of concentrating water in the concentrating compartments being 1.2-20 times to the linear velocity in the demineralizing compartments |
| PATENT PHOTOCOPY | Available on request |
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