JPH0751672A - Method for electrolytically treating water - Google Patents

Abstract

PURPOSE:To efficiently generate good-quality alkaline ionized water or acidic water by adjusting a current to be impressed on electrodes in connection with the inversion of the polarity of electrode to promote uniformity in the pH of desired electrolyzed water. CONSTITUTION:When the polarities of electrodes 2 and 3 are inverted to change the cathode chamber for generating alkaline water from an outer electrode chamber 6 to an inner electrode chamber 5 in an electrolytic cell 1 to produce alkaline water, since the electrolytic efficiency of alkaline water is decreased and its pH lowered by decrease of electrolytic area of the cathode its voltage is increased to apply more current. Consequently, the pH of alkaline water is not lowered, and the pH is uniformly maintained. Besides, when the polarities are again inverted in the cell 1 to change the cathode chamber from the inner electrode chamber 5 to the outer electrode chamber 6, and the applied voltage is returned to its original value. As the voltage is adjusted in connection with the inversion of polarity, the desired electrolytic water uniform in pH is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic water conditioning method for electrolyzing water in a diaphragm electrolyzer to produce alkaline ionized water for drinking or acidic electrolytic sterilized water according to the purpose of use.

[0002]

2. Description of the Related Art An electrolytic voltage is applied to water in a pair of positive and negative electrode chambers partitioned by electrolytic diaphragms to obtain alkaline ionized water from the cathode chamber or sterilized water from the anode chamber according to the purpose. Water methods are known. In this case, if electrolysis is performed with the same polarity for a long time, a protrusion such as calcium adheres to an alkaline water channel such as a cathode, which lowers the electrolysis efficiency. Therefore, a method is adopted in which the polarity of the voltage applied to both electrodes is switched every predetermined time to carry out electrolytic water conditioning to dissolve the precipitated calcium in water while generating the target electrolyzed water.

[0003]

By the way, in the diaphragm membrane electrolytic cell, when the target electrolyzed water is produced, the flow rate ratio between the cathode chamber and the anode chamber is different. For example, the flow rate ratio for the purpose of alkaline water is to the alkaline water side (cathode chamber) 2 to the acidic water side (anode chamber) 1, and for the purpose of producing sterile water on the acidic water side. The flow rate ratio is, for example, 1 for alkaline water side,
Acidic water side 2. Further, the continuous water flow type electrolytic water conditioner in which the cylindrical electrolytic cell is partitioned into a pair of concentric electrode chambers by a diaphragm has different electrode surface areas of the inner electrode and the outer electrode, and further, the inner electrode chamber and the outer electrode chamber. The cross-sectional area of the water passage and the flow velocity are different.

As described above, an electrode tank is used in which the electrolysis efficiency of the pair of electrode chambers differs depending on the difference in the electrode surface, the cross-sectional area of the electrode chambers, or the flow velocity, and the polarity of the electrodes is switched at predetermined intervals to continuously perform electrolytic preparation. When trying to water, switch the polarity,
That is, the pH of the electrolyzed water to be used inevitably changes due to the mutual exchange of the electrode chambers, which causes a problem that electrolyzed water having a uniform pH cannot be obtained.

An object of the present invention is to reduce the pH change of water for use due to polarity change in the electrolyzed water treatment of a diaphragm in which the polarity of electrodes is reversed every predetermined time to perform electrolytic water conditioning. To maintain or promote uniformity.

[0008]

EXAMPLE FIG. 1 shows an example of an electrolytic water conditioning apparatus. An electrolytic cell 1 of this apparatus has an inner electrode 2 and an outer electrode 3 arranged concentrically, and an electrolytic diaphragm between both electrodes 2 and 3. 4 is divided into an inner electrode chamber 5 and an outer electrode chamber 6, and while introducing raw water from the water supply section 7, water is electrolyzed by applying a direct current electrolysis voltage to both electrodes 2 and 3 to form a cathode chamber. The generated alkaline water and the acidic water generated in the anode chamber are discharged from the separate electrolyzed water drain pipes 8 and 9.

An electric control unit 11 is provided in the electric circuit 10 for applying an electrolytic voltage to both electrodes 2 and 3, and the control unit 11 reverses the polarities of the inner electrode 2 and the outer electrode 3 at predetermined time intervals. Then, calcium or the like protruding to the cathode chamber side is dissolved in the acidic water after the polarity conversion.

By the way, in this type of electrolytic cell 1, the inner electrodes 2 and 3 have different electrolysis surface areas, and the cathode chamber and the anode chamber can be used for both alkaline water and acidic water. Flow rate or flow velocity is different. Therefore, if the polarities of the electrodes are changed while supplying the current of the same voltage, the pH of the target electrolyzed water will change between the outer electrode chamber 6 and the inner electrode chamber 5. For example, when alkaline water is intended, in an electrolytic cell in which a reference electrolysis voltage is set so that the outer electrode 3 serves as a cathode and alkaline water having a predetermined pH is obtained, the inner electrode 2 having a small electrolysis area due to the polarity change of the electrode. When is converted to a cathode, the electrolysis efficiency of alkaline water generation decreases, and
No alkaline water can be obtained. In the opposite case, that is, when the reference electrolysis voltage is set so that the inner electrode 2 is used as a cathode and alkaline water of a predetermined pH is obtained, the opposite phenomenon occurs, and in any case, the current supply amount remains the same. When the polarities of the electrode chambers having different electrolysis efficiencies are changed, the fluctuation of pH cannot be avoided.

In view of this, the present invention adjusts the applied electrolysis voltage to the side where the uniformity of the pH of the target electrolyzed water is promoted in conjunction with the polarity change of the electrode. That is, in the above-mentioned embodiment for alkaline water, when the cathode chamber for generating alkaline water by switching the polarities of the electrodes is switched from the outer electrode chamber 6 to the inner electrode chamber 5, the electrolytic area of the cathode is reduced, Since the electrolysis efficiency of alkaline water is lowered and the pH value is lowered, the voltage is raised so that a large amount of electrolysis current flows. By doing so, the decrease in the pH value of the alkaline water is corrected, and the homogeneity of the pH is obtained. On the other hand, the cathode chamber is changed from the inner electrode chamber 5 to the outer electrode chamber 6 by re-polarization.
When is switched to, the applied voltage is returned to the original in conjunction with this.

Thus, by adjusting the electrolysis voltage according to the polarity change of the electrolytic cell, even if the polarity is changed, the pH is changed.
The desired electrolyzed water having a uniform value can be obtained.

The adjustment of the electrolysis voltage due to the polarity change can be easily carried out by incorporating a necessary circuit in the electric control section 11 of the electric circuit 10.

Although the above description has been made mainly for the case of producing alkaline ionized water, the same applies to the case of producing acidic electrolytic sterilized water from the anode chamber side.

Further, although the above description has described the case where the electrolysis efficiency of the electrode chamber changes depending on the difference in the electrolysis surface area of the electrode, the same applies to the case where the electrolysis efficiency varies depending on the cross-sectional area and flow velocity of the electrode chamber. . .

Further, in the above description, the case of using the cylindrical continuous type electrolytic cell is exemplified, but other electrolytic cells,
The same applies to the case of using a batch type electrolytic cell, for example.

[0017]

[Effects] With the above-described structure, the polarity change of the electrode eliminates the adverse effect of calcium protrusion, and the pH change is corrected by the polarity change. Therefore, high-quality alkaline ionized water or acidic water (sterilized water) is used. Can be efficiently generated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of an electrolytic water conditioning apparatus used in an electrolytic treatment method of the present invention.

[Explanation of symbols]

1 ... Electrolyte tank, 2, 3 ... Electrode, 4 ... Electrolytic diaphragm, 5,
6 ... Electrode chamber, 8, 9 ... Electrolyzed water discharge pipe, 10 ... Electric circuit, 11 ... Electric control part.

Claims (1)

[Claims] 1. An electrolytic voltage applied to both electrodes using a diaphragm electrolyzer in which the electrolysis efficiency of a pair of electrode chambers differs depending on the surface area of the opposing electrodes or the cross-sectional area or flow velocity of the opposing electrode chambers. In the electrolyzed water treatment method in which the polarity is reversed every predetermined time to perform electrolytic water conditioning, when the polarity of the electrode is switched, the polarity of the electrode is switched so as to promote the uniformity of the pH of the target electrolyzed water. Method of electrolytic treatment of water characterized by adjusting current applied to