JPH0871561A - Method for producing electrolytically generated water - Google Patents

Abstract

PURPOSE: To maintain the characteristics of electrolytically generated water within a specified range by a simple means. CONSTITUTION: In a method for producing electrolytically generated water in which an electrolytic bath 10a equipped with an anode cell and a cathode cell which are separated by a diaphragm having ionic pemeability is used, and the water is produced in both cells in which supplied salt water is electrolyzed, the concentration of the salt water supplied to both cells or power supplied to both cells is increased every specified accumulated time of operation in the electrolytic bath 10a, maintaining the characteristics of the electrolytically generated water within a given range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing electrolyzed water used for sterilizing and washing fresh foods, thawing frozen foods, sterilizing and cleaning cloths such as cloths and hands.

[0002]

2. Description of the Related Art As an example of a method for producing electrolyzed water used for such treatment, as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-42077, an anode chamber partitioned by a diaphragm having ion permeability. There is also a manufacturing method in which an electrolytic cell provided with a cathode chamber is used, and a saline solution is supplied to both chambers for electrolysis to produce electrolyzed water in these chambers. In the manufacturing method, acidic water having bactericidal power (produced water on the anode chamber side) is produced in the anode chamber, and alkaline water having low redox potential (produced water on the cathode chamber side) is obtained in the cathode chamber. These acidic water and alkaline water are appropriately used for various purposes.

[0003]

By the way, in such a method for producing electrolytically produced water, when the electrolytic cell is operated for a long time, the available chlorine amount of the produced water on the anode chamber side, pH, and the oxidation of the produced water on the cathode chamber side are oxidized. The characteristics of the electrolytically generated water, such as the reduction potential, gradually decrease. One of the causes of the deterioration of the characteristics of the electrolytically generated water is the consumption and deterioration of the noble metal coating on the surface of the electrodes arranged in each chamber of the electrolytic cell. This deterioration phenomenon is caused by platinum containing iridium. -It is particularly remarkable in an electrode having an iridium-based fired coating. The electrode has an advantage that it is extremely advantageous for producing available chlorine, but is consumed and deteriorated by switching positive and negative applied voltages to both electrodes for removing scale adhering to the electrode during electrolysis. By switching the polarity of the printing voltage of the electrodes, a reaction occurs in which iridium oxide is ionized through iridium, and this reaction consumes the coating of each electrode,
It will deteriorate. Therefore, the consumption and deterioration of the electrode coating are related to the number of times the polarity of the applied voltage is switched, and when the polarity is switched regularly, it is related to the operating time of the electrolytic cell.

As a means for controlling the characteristics of the electrolyzed water so as to always maintain the characteristics within a certain range, as shown in the above-mentioned publication, the residual chlorine concentration and pH of the electrolyzed water are
The residual chlorine concentration value and the pH value are preset and compared, and the residual chlorine concentration is controlled by controlling the DC power supply to adjust the applied voltage, and the pH is adjusted by adjusting the flow rate of the raw water for dilution. A means for controlling the valve to adjust the flow rate of the raw water for dilution is adopted. However, in order to adopt such a control means, a large number of control devices are required, a large space is required for the installation of the devices, the cost is increased, and moreover, there is a problem that a certain amount of electrolyzed water cannot always be obtained. is there. Therefore, an object of the present invention is to solve these problems by adopting a simple means in order to maintain the characteristics of electrolyzed water in a certain range.

[0005]

SUMMARY OF THE INVENTION The present invention uses an electrolytic cell having an anode chamber and a cathode chamber which are partitioned by a diaphragm having ion permeable capacity, and supplies saline to both chambers for electrolysis. Is a method for producing electrolyzed water in both of these chambers, in which the concentration of the saline solution supplied to the both chambers is increased at fixed intervals of operation in the electrolyzer to keep the characteristics of electrolyzed water constant. It is characterized in that it is maintained within the range of.

Further, the present invention uses an electrolytic cell provided with an anode chamber and a cathode chamber which are partitioned by a diaphragm having ion permeability, and supplies saline to these chambers to electrolyze both chambers. In the manufacturing method for producing electrolyzed water, the electric power supplied to the both chambers is increased at every constant operation integrated time in the electrolyzer to maintain the characteristics of the electrolyzed water within a certain range. It is characterized by.

[0007]

[Advantageous effects of the invention] In adopting the present invention,
Preliminary understanding of changes over time in the characteristics of electrolyzed water, as well as the relationships between the characteristics of electrolyzed water, the concentration of saline solution, and the power supplied to the electrodes. Thus, in the present invention, the concentration of the saline solution supplied to the electrolytic cell is increased and / or the electric power supplied to both electrodes is increased each time the integrated time of the operating time of the electrolytic cell reaches a certain time. By increasing (changing the current value and the voltage value), the electrolysis efficiency in the electrolytic cell can be maintained within a certain range, and the characteristics of the electrolyzed water can be maintained within a certain range. In this case, it suffices if there is a control device that integrates the operating time and increases the electric power and / or the concentration of the saline solution to be supplied at a constant integration time, which reduces the control device and the installation space of the device. Also, the cost can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a manufacturing apparatus suitable for carrying out the manufacturing method of the present invention. The manufacturing apparatus is configured to include an electrolytic bath 10a, a first storage tank 10b of dilute saline solution, a saline solution concentration varying means 10c, and an electric power varying means 10d.

In the electrolytic cell 10a, a diaphragm 12 is arranged in a cell body 11, and two cell chambers 11a, 11 are provided in the cell body 11.
The anode 13a is provided in one of the compartments 11a of each compartment to form an anode chamber, and the cathode 13b is provided in the other compartment 11b of the compartments as a cathode chamber. Has been done. A positive / negative voltage is applied to each of the electrodes 13a and 13b by switching between the electrodes at a predetermined time for a short time.
The polarities of 3a and 13b are switched. The first storage tank 10b stores dilute saline solution having a predetermined concentration to be supplied to the compartments 11a and 11b of the electrolytic cell 10a.
A and 11b are connected via a supply pipe 14a.
Outflow pipes 14b and 14c for flowing out electrolytically generated water are connected to the compartments 11a and 11b, respectively. Acidic water, which is produced water on the anode chamber side, flows out from the first outflow pipe 14b, and alkaline water, which is produced water on the cathode chamber side, flows out from the second outflow pipe 14c.

The concentration varying means 10c comprises a second storage tank 15a for storing saturated saline solution, a concentration control device 15b, a concentration sensor 15c, and control valves 15d, 15e. Saturated saline is stored in the second storage tank 15a, and the stored saturated saline is stirred by the stirring pump 15f.
Is stirred by. The concentration sensor 15c is arranged in the first storage tank 10b, and the control valve 15d is provided in the middle of a connecting pipe connecting the second storage tank 15a and the first storage tank 10b, and the control valve 15e is provided in the middle of the water supply pipe. Concentration control device 15b
Is the concentration sensor 1 arranged in the first storage tank 10b.
5c and the control valves 15d and 15e, the first sensor based on the concentration detection signal from the concentration sensor 15c.
The concentration of the saline solution in the storage tank 10b is controlled to the value of the input set concentration, the detected concentration and the set concentration are compared, and the control valves 15d and 15e are controlled so that these concentrations become the same value. Control the opening. Concentration control device 15b
The value of the set concentration to be input to the
When the operating time of 0a reaches a predetermined constant integration time, the concentration of the dilute saline solution in the first storage tank 10b is set to be gradually increased by a predetermined constant concentration at each constant integration time. ing.

The power varying means 10d is a variable voltage power source 16a.
And a voltage control device 16b for controlling the DC power supplied to each electrode 13a, 13b to the set value input to the voltage control device 16b.
a, 13b. The set voltage input to the power control device 16b can be changed, and when the operating time of the electrolytic cell 10a reaches a predetermined constant integration time, the power supplied to both electrodes 13a, 13b at each constant integration time. The value is set to gradually increase by a predetermined fixed amount.

In order to produce electrolyzed water using the production apparatus having such a construction, the dilute saline solution in the first storage tank 10b, which is kept at a constant concentration, is driven in the circulation pump 14d to drive the electrolyzer 10a. Supply to each compartment 11a, 11b,
In this state, a predetermined amount of electric power is supplied to each of the electrodes 13a and 13b. As a result, the dilute saline solution is electrolyzed in each of the chambers 11a and 11b, acidic water is generated in one compartment 11a and flows out as produced water on the anode chamber side, and the other compartment 11b is generated.
Then, alkaline water is generated and flows out as generated water on the cathode chamber side. In this electrolysis state, the concentration of dilute saline solution is maintained at a constant concentration for a predetermined time, and both electrodes 1
The applied voltage to 3a and 13b is maintained constant.

By the way, in the manufacturing apparatus, the concentration control device 15b constituting the concentration varying means 10c and the voltage control device 16b constituting the power varying means 10d are provided with a timer for integrating the operating time of the electrolytic cell 10a. When the cumulative time of the operating time reaches a predetermined time, the concentration varying means 10c causes the concentration of the dilute saline solution stored in the first storage tank 14b to be a preset concentration for each predetermined cumulative time. In addition, in the power varying means 10d, the applied voltage to both electrodes 13a and 13b is increased to increase the supplied power to a preset power amount.

Therefore, according to the manufacturing method, the concentration and / or the amount of electric power of the dilute saline solution to be supplied are set to the electrolytic cell 10.
It is possible to correct the characteristics of the electrolyzed water by increasing the operating time of a at each predetermined integration time each time,
The characteristics of the electrolyzed water can always be maintained within a certain range. FIG. 2 shows an example in which the most important amount of available chlorine among the characteristics of electrolyzed water is corrected. In this example, the increase timing of the concentration and / or the amount of electric power of the dilute salt solution is set such that the cumulative operation time is lengthened and the cumulative time is gradually shortened in the initial operation of the electrolytic cell 10a. In this state, the amount of change in the available chlorine amount also gradually decreases.

In the production method of the present invention, either the concentration of dilute saline solution of electrolytically produced water or the amount of electric power may be increased, or both may be increased simultaneously. When increasing the amount of power, the voltage may be kept constant and the current may be increased.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a manufacturing apparatus suitable for implementing a manufacturing method of the present invention.

FIG. 2 is a graph corresponding to an operating time showing a control state of an effective chlorine concentration in electrolyzed water.

[Explanation of symbols]

10a ... Electrolysis tank, 10b ... First storage tank, 10c ... Concentration changing means, 10d ... Electric power changing means, 11 ... Tank body, 1
2 ... diaphragm, 13a, 13b ... electrode, 15a ... second storage tank, 15b ... concentration control device, 15c ... concentration sensor, 1
5d, 15e ... Control valve, 16a ... Variable voltage device, 1
6b ... Voltage control device.

Claims (2)

[Claims] 1. An electrolytic cell comprising an anode chamber and a cathode chamber which are partitioned by a diaphragm having ion permeability is used.
It is a manufacturing method in which saline is supplied to both of these chambers to electrolyze to produce electrolyzed water in these chambers, and the concentration of the saline to be supplied to both chambers at each predetermined cumulative operation time in the electrolytic cell. To maintain the characteristics of the electrolyzed water within a certain range. 2. An electrolytic cell comprising an anode chamber and a cathode chamber, which are partitioned by a diaphragm having ion permeability, is used.
It is a manufacturing method in which saline is supplied to both of these chambers to electrolyze to produce electrolyzed water in these chambers, and electric power to be supplied to both chambers is increased at each predetermined accumulated operation time in the electrolytic cell. And maintaining the characteristics of the electrolyzed water within a certain range.