JP4204955B2 - Electrolyzed water generation method and apparatus - Google Patents

Description

  The present invention relates to a method and an apparatus for producing electrolyzed water containing hypochlorous acid as a main sterilizing component.

In recent years, many electrolyzed water generating apparatuses that electrolyze salt water in an electrolytic cell equipped with a diaphragm to produce strongly acidic water or strong alkaline water are on the market. However, these devices require management such as the addition of salt and the replacement of the diaphragm.
On the other hand, there is known a method of generating electrolyzed water having sterilizing power by electrolytic treatment of saline by increasing the chlorine component by a non-diaphragm system without using a diaphragm.

The sterilizing component in the electrolyzed water produced by the method of the non-diaphragm type is composed of hypochlorite ion (ClO ⁻ ) that is durable but relatively weak in sterilizing power, and hypochlorous acid (HClO) that has a strong sterilizing power. And can be broadly divided. The ratio of the two is determined by the pH of the electrolyzed water. The higher the pH (the stronger the alkalinity), the less hypochlorous acid (HClO) and the more hypochlorite ions (ClO ⁻ ). It is generally known.
Therefore, by reducing the pH of the electrolyzed water (shifting to the acidic side), the ratio of hypochlorous acid (HClO) having a strong sterilizing power can be increased to obtain electrolyzed water having a strong sterilizing power. The following documents are known as an example of such a method.
Japanese Patent Laid-Open No. 10-24294 (Summary, FIG. 1)

In the method of Patent Document 1, by lowering the pH of the electrolytic water by the introduction of bubbling and dry ice carbon dioxide entering the cylinder, hypochlorite ions ^- presence ratio of hypochlorous acid on (HClO) (ClO) The sterilizing power of electrolyzed water is strengthened by increasing.

  However, in this method, the carbon dioxide gas that is not dissolved in the electrolyzed water due to the large bubbles of the supplied carbon dioxide gas is released into the atmosphere and is not only inefficient, but also dissolved in the electrolyzed water by bubbling the carbon dioxide gas. Hypochlorous acid (HClO) may fly into the atmosphere and the sterilizing power may be reduced. In addition, there is a problem that the raw material of carbon dioxide gas is expensive and takes time and effort for management.

  Therefore, the object of the present invention is to obtain electrolyzed water having a strong sterilizing power by simply electrolyzing tap water using residual chlorine contained in tap water without requiring any additional additives, and for a long time. It is to provide a method and an apparatus for producing electrolyzed water that can realize maintenance-free.

To achieve the above object, the present onset Ming, the interior of the electrolytic cell without a diaphragm partitioning into an anode chamber and a cathode chamber, generating electrolytic water having a sterilizing effect by electrolyzing water containing chlorine components An electrolyzed water generating device of a diaphragm type comprising: an electrolytic cell having a pair of insoluble electrodes and an electrode having at least an anode as a carbon electrode; and a DC power source for applying a DC voltage to the insoluble electrode and the carbon electrode. comprising, in the electrolytic cell, the DC electrolysis of water by the insoluble electrode, HClO and ClO contained in electrolytic water ^- an increase step of increasing the concentration of, in the electrolytic cell, the DC electrolysis of water by the carbon electrode This is used in a method including a pH adjustment step of adjusting the pH of electrolyzed water by generating carbon dioxide gas and dissolving the carbon dioxide gas in electrolyzed water .

According to the method of the present invention, the concentration of hypochlorous acid (HClO) and hypochlorite ion (ClO ⁻ ) is increased by electrolysis using an insoluble electrode, and the pH of electrolyzed water is electrolyzed using a carbon electrode. Adjust to increase the ratio of hypochlorous acid (HClO). Therefore, electrolyzed water having a strong sterilizing power can be obtained by only electrolyzing water without adding sodium chloride or carbon dioxide separately. In addition, troublesome operations such as replacement of bulky carbon dioxide cylinders, refilling with dry ice, and introduction of acidic substances that require attention such as hydrochloric acid are not required, and costs related to raw materials and management can be kept low.

  In addition, carbon dioxide gas generated by electrolysis dissolves in water before bubbles are formed, so carbon dioxide gas is not wasted into the atmosphere, so it is efficient and hypochlorous acid dissolved in water. Since acid (HClO) is also difficult to fly into the atmosphere, it is possible to prevent a decrease in sterilizing power.

In one aspect of the present invention, the pH adjustment step is performed after the increase step.
According to this aspect, since the pH of the electrolyzed water is adjusted in the pH adjusting step after the pH of the electrolyzed water is changed by electrolysis in the increasing step or replenishment of new water, the pH can be easily adjusted and stable sterilizing power can be obtained. The electrolyzed water having can be obtained.

In another aspect of the present invention, the increasing step and the pH adjusting step are performed simultaneously.
In this way, after performing the increasing step, pH adjustment becomes easy as in the case of performing the pH adjusting step, and electrolysis in the increasing step and electrolysis in the pH adjusting step proceed simultaneously. Time can be shortened.

In the present invention, tap water is used as raw water. Tap water contains a chlorine component (residual chlorine) based on the water quality standards stipulated by the Water Supply Law. Using this chlorine component, hypochlorous acid (HClO) can be added without adding chlorine compounds such as salt. ) And hypochlorite ion (ClO ⁻ ) concentration can be increased.
Therefore, the “water containing a chlorine component” in the present invention is not an aqueous solution in which a chlorine compound such as sodium chloride is separately added for electrolysis, but means tap water containing a chlorine component by chlorine disinfection. In addition to drinking water, water containing chlorinated water from rainwater and groundwater is also included.

Since the pH of tap water varies depending on the region, season, and the amount of organic residue, the pH of the electrolyzed water is always set to a predetermined level simply by performing the electrolysis in the pH adjustment step on a constant basis (electrolysis current, time). It is difficult to maintain a value. Therefore, in the present invention, a pH measurement unit that measures the pH of the electrolyzed water generated in the pH adjustment step, and a determination unit that determines whether or not the measured value of the pH measurement unit is within a predetermined pH value range. It is preferable to change the amount of supplied power that contributes to electrolysis in the carbon electrode from the second DC power supply according to the determination result of the determination means.
In this way, the pH adjustment amount can be controlled by changing the electrolysis current (applied voltage) to the carbon electrode according to changes in the pH of the raw water, so the pH of the electrolyzed water is always maintained at an optimal value. It becomes possible to do. Therefore, electrolyzed water having stable sterilizing power can be obtained.

In the electrolyzed water generating apparatus using the method of the present invention, the carbon electrode in the pH adjustment step is detachably inserted between a pair of fixed electrodes connected to the second DC power source and connected to the power source. It is composed of one or more carbon electrodes that are not formed .
With such a configuration, it is not necessary to attach a lead wire (power line) to the carbon electrode that is consumed by electrolysis, and replacement of the carbon electrode is facilitated, so that maintainability is improved.

Moreover, the carbon electrode inserted / removed between fixed electrodes is comprised with many granular charcoal with which the bag was filled .
By doing so, it is not necessary to form the carbon electrode into a specific shape (for example, a plate shape or a rod shape), so that it does not take time and effort. Moreover, as the granular charcoal, various carbides such as activated carbon and charcoal scraps can be used. For example, waste materials generated when demolishing a house can be recycled, so the cost is reduced and the environment is considered. It can be a device.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A schematically shows an electrolyzed water generating apparatus according to the first embodiment.
The apparatus includes a water storage tank T, a first electrolytic cell DS1, a second electrolytic cell DS2, a pH sensor (pH measuring means) 41, and a controller (discriminating means). The tank T and the electrolyzers DS1 and DS2 are connected to each other via first and second circulation conduits 14 and 24, respectively.

  A water pipe S and an outflow pipe 34 are connected to the tank T. The water pipe S is connected to a tank T through a valve V and supplies tap water into the tank T. The outflow pipe 34 is for flowing out water (electrolyzed water) in the tank T to the outside. Pumps P1, P2, and P3 are provided in the first circulation line 14, the second circulation line 24, and the outflow pipe 34, respectively. Each pump P1, P2, P3 sends out water in the tank T via strainers S1, S2, S3 provided in the tank T.

The first electrolytic cell DS1 is a non-diaphragm electrolytic cell provided with a pair of insoluble electrodes DP1. A first DC power source 11 is connected to each electrode DP1, and one electrode is an anode and the other electrode is a cathode. The insoluble electrode DP1 is made of, for example, a titanium (Ti) substrate coated with platinum (Pt) and iridium (Ir) by plating or baking.
The insoluble electrode DP1 is made of a stainless steel material, a platinum material such as platinum or ruthenium (Ru), or a single noble metal element without using a coating material. An electrode can be employed.

  The second electrolytic cell DS2 is a non-diaphragm electrolytic cell provided with a pair of carbon electrodes DP2. A second DC power source 21 is connected to each electrode DP2, and one electrode is an anode and the other electrode is a cathode. The carbon electrode DP2 is made of, for example, graphite hardened with a resin, but any carbon-containing material that generates carbon dioxide by electrolysis can be used. As a material constituting the carbon electrode DP2, various carbon products such as Bincho charcoal, charcoal, and activated carbon can be employed in addition to graphite.

The pH sensor 41 measures the pH of the electrolyzed water generated in the pH adjustment step described later. In the present embodiment, since the electrolyzed water is circulated through the tank T, the pH sensor 41 is installed so as to measure the pH of the water (electrolyzed water) in the tank T. The pH value measured by the pH sensor 41 is output to the controller 42.
The controller 42 is electrically connected to the second DC power source 21 and controls the amount of supplied power supplied from the second DC power source 21 to the carbon electrode DP2 according to the measured value of the pH sensor 41. To do. The controller 42 includes storage means (not shown), and stores a predetermined pH value range TP, which is a predetermined pH target value, in the storage means. When the measured value is sent from the pH sensor 41, the controller 42 determines whether or not the measured value is in the pH value range TP, and the power supply of the second DC power source 21 is determined according to the determination result. Control the amount.

Next, a method for generating electrolyzed water using this apparatus will be described in detail.
First, when the apparatus is used for the first time, the valve V is opened to supply tap water (raw water) into the tank T. When a predetermined amount of tap water is stored in the tank T, the valve V is closed and the supply of tap water is stopped. When the pumps P1 and P2 are driven in this state, the water in the tank T is sent to the electrolytic cells DS1 and DS2 through the first and second circulation pipes 14 and 24, and the tank T and the respective electrolyzers. It is circulated between tanks DS1 and DS2.

In the first and second electrolytic cells DS1 and DS2, an increasing step and a pH adjusting step described below are performed, respectively.
Increasing step When the voltage is applied from the first DC power source 11 to the insoluble electrode DP1 in a state where water is supplied from the tank T to the first electrolytic cell DS1 by the pump P1, the water is electrolyzed. Chlorine gas is generated. The chlorine gas reacts with hydroxide ions and water, HClO and ClO ^- are produced. Thus, the electrolyzed water generated in the first electrolyzer DS1 flows out to the tank T through the first circulation conduit 14. Thereafter, by continuing the electrolysis with the insoluble electrode DP1 while circulating water between the tank T and the first electrolytic cell DS1 for a predetermined time, for example, 15 minutes, the concentrations of HClO and ClO ⁻ in the electrolytic water increase.

pH adjustment step When a voltage is applied from the second DC power source 21 to the carbon electrode DP2 in a state where water is supplied from the tank T to the second electrolytic cell DS2 by the pump P2, the electrode (anode) Carbon dioxide is combined with oxygen atoms in water molecules to generate carbon dioxide. When this carbon dioxide gas is dissolved in water, acidic carbonic acid is generated, and the pH of the electrolyzed water is lowered. Thus, the electrolyzed water whose pH is adjusted in the second electrolyzer DS2 flows out to the tank T through the second circulation pipe 24. Thereafter, the electrolysis with the carbon electrode DP2 is continued while circulating the water between the tank T and the second electrolytic cell DS2 for a predetermined time, for example, 15 minutes, thereby further lowering the pH of the electrolyzed water.

In general, it is known that the abundance ratio of HClO exceeds 90% when the pH value of electrolyzed water is 6.5 or less, and is present most frequently in the vicinity of a pH value of around 5. Therefore, in the pH adjustment step, it is preferable to set the target value of the pH of the electrolyzed water to be generated to a value between about 5 and 6.5.
However, the pH value of tap water, which is the electrolyzed water, is not constant and varies depending on the region, season, etc. In order to set the pH of the electrolyzed water to a desired value within a predetermined electrolysis time, the carbon electrode It is necessary to change the electrolytic current of DP2.

Such control is performed by the pH sensor 41 and the controller 42 according to the flowchart of FIG.
The electrolyzed water electrolyzed in the second electrolytic cell DS2 is circulated to the tank T and mixed with the water in the tank T. The pH sensor 41 measures the pH value of the water in the tank T and outputs the measured value to the controller 42. As shown in FIG. 1B, the controller 42 determines whether or not the measured value from the pH sensor 41 is in the predetermined pH value range TP (whether or not the measured value is larger than the pH value range TP). Determine. When the controller 42 determines that the measured value is larger than the pH value range TP, as shown in FIG. 1 (b), the controller 42 is smaller than a preset value E so that the amount of electrolysis is reduced to some extent. Control is performed to increase the amount of power supplied to the second DC power supply 21 (applied voltage). Thereby, since the electric power (electrolysis current) contributing to the electrolysis at the carbon electrode DP2 increases, the pH change (decrease in pH) of the electrolyzed water increases.

On the other hand, when it is determined that the measured value is less than or equal to the pH value range TP, the controller 42 determines that the supply power (applied voltage) of the second DC power supply 21 is as shown in FIG. Control is made to be smaller than the set value E. Thereby, since electric power (electrolysis current) contributing to electrolysis at the carbon electrode DP2 is reduced, pH change (reduction in pH) of the electrolyzed water is reduced. In this control, the power supply amount of the second DC power supply 21 may be maintained at a small value equal to or less than the set value E, or the power supply from the second DC power supply 21 may be completely stopped. Good.
Thus, by monitoring the pH in the tank T and adjusting the electrolysis current to the carbon electrode DP2, electrolyzed water having stable sterilizing power can be obtained without waste.

  FIGS. 2A to 2C show a procedure in which the present inventor generates electrolyzed water using the electrolyzed water generator of FIG. 1A. In each procedure, 10 L of tap water was used, the amount of electrolyzed water produced was 10 L, and the electrolysis time in the increasing step and the pH adjusting step was set to 15 minutes each.

In the procedure of FIG. 2 (a), both the pumps P1 and P2 (FIG. 1 (a)) were driven, and the increase step and the pH adjustment step were performed simultaneously. At this time, since the increasing step and the pH adjusting step proceed simultaneously, the total electrolysis time required to generate 10 L of electrolyzed water is 15 minutes.
In the procedure of FIG. 2B, first, the pH adjustment step is performed by driving only the pump P2 without driving the pump P1, and then the increase step is performed by stopping the pump P2 and driving only the pump P1. It was. At this time, since the electrolysis time required for each step is 15 minutes, the total electrolysis time required to produce 10 L of electrolyzed water is 30 minutes.
In the procedure of FIG. 2 (c), first, the pump P2 is driven without driving the pump P2, and the increase process is performed. Then, the pump P1 is stopped and only the pump P2 is driven to perform the pH adjustment process. It was. At this time, since the electrolysis time required for each step is 15 minutes, the total electrolysis time required to produce 10 L of electrolyzed water is 30 minutes.

FIG. 2 (d) shows the concentration of HClO in the electrolyzed water actually produced by each of the procedures in FIGS. 2 (a) to 2 (c). In FIG. 2 (d), as a comparative example, the concentration of HClO in electrolyzed water generated only by electrolysis using a conventional insoluble electrode is also shown.
The electrolyzed water produced by the method of the present invention from FIG. 2 (d) is remarkably compared with the electrolyzed water of the comparative example, regardless of the one produced by any of the procedures of FIGS. 2 (a) to (c). It can be seen that the concentration of HClO is high. Moreover, since the concentration of HClO when the pH adjustment process is performed after the increase process is the highest value, the electrolyzed water having the strongest bactericidal effect can be obtained by adopting the procedure of FIG. It can be seen that can be generated. However, the electrolyzed water produced by the procedure of FIG. 2 (a) also has a sufficient HClO concentration, and the total electrolysis time is half (15 minutes) of the procedure of FIGS. 2 (a) and (b). Therefore, the merit of adopting the procedure of FIG.

The electrolyzed water generated as described above is finally discharged by the pump P3 through the outflow pipe 34 and used as electrolyzed water for sterilization. When electrolyzed water with a constant sterilization quality is required, a second storage tank is provided downstream of the outflow pipe 34, and the generated electrolyzed water is batch-supplemented from the tank T to the second storage tank. You may do it.
Further, the increase step and the pH adjustment step are stopped after the completion of the predetermined electrolysis, but the electrolysis is performed again according to the decrease of the electrolyzed water in the tank T. At this time, it is necessary to replenish the tap water from the water pipe S. This water replenishment is performed by detecting the water level in the tank T by a liquid level sensor (not shown) provided in the tank T, and using this detection result. In response to this, it is preferable that the tap water is replenished by automatically opening and closing the valve V. The valve V may be mechanically opened and closed using a ball tap (ball plug).

FIG. 3 shows a second embodiment. As shown in this figure, the first electrolytic cell DS1 and the second electrolytic cell DS2 are connected in series by a water conduit 30, and the tap water supplied from the water pipe S is each electrolytic cell DS1 by the pressure of the tap water. , DS2 is passed only once. The flowing water is electrolyzed while passing through each electrolytic cell DS1, DS2, and flows out through the outflow pipe 34. Other configurations are the same as those described with reference to FIG. 1A, and thus the same reference numerals are given to the same portions or corresponding portions, and detailed descriptions thereof are omitted.
According to this embodiment, electrolyzed water having sufficient sterilizing power can be obtained by slowing down the flow rate of the water passing through the electrolyzers DS1 and DS2.

  By the way, in the pH adjusting step, carbon in the carbon electrode DP2 is combined with oxygen atoms in water molecules to generate carbon dioxide gas, so that the carbon electrode DP2 is consumed as electrolysis continues. Therefore, it is necessary to periodically replace the carbon electrode DP2, but at this time, since the power line from the power source has to be rewired to the new carbon electrode DP2, it takes time to perform the replacement work.

  Therefore, in order to facilitate replacement of the carbon electrode DP2, the carbon electrode DP2 may be configured as shown in FIG. That is, a pair of fixed electrodes DP3 are arranged apart from each other, and a plurality of carbon electrodes DP2 are arranged between the fixed electrodes DP3. The fixed electrode DP3 is formed of an insoluble material, and the second DC power source 21 is connected to both the fixed electrodes DP3. On the other hand, the plurality of carbon electrodes DP2 are not connected to a power source, but are detachably inserted between the fixed electrodes DP3.

When a DC voltage is applied from the second DC power source 21 to the fixed electrode DP3, each carbon electrode DP2 is polarized by electrostatic induction action, and an anode and a cathode are formed at one end and the other end of each carbon electrode DP2, respectively. As a result, a current flows between the fixed electrodes DP3, and electrolysis becomes possible. According to this embodiment, since the power line is not attached to the carbon electrode DP2 that is consumed by electrolysis, the carbon electrode DP2 can be easily replaced. Further, since the fixed electrode DP3 is slightly consumed by electrolysis, it is not necessary to replace it for a long time. Therefore, maintainability is improved by adopting such a configuration.
In order to efficiently polarize the carbon electrode DP2, the carbon electrode DP2 and the fixed electrode DP3 are each formed in a flat plate shape and arranged so that the surfaces of the electrodes DP2 and DP3 face each other in a parallel state. In addition, it is preferable to make the gap between the electrodes DP2 and DP3 as small as possible.

  However, the carbon electrode DP2 to be inserted does not necessarily have to be formed in a specific shape such as a plate shape or a rod shape, and may be constituted by a large number of granular charcoal, for example, as shown in FIG. The granular charcoal is filled in a mesh bag 50, and the mesh bag 50 is accommodated in a mesh bag 52 fixed between fixed electrodes DP3. In this state, when a voltage is applied to the fixed electrode DP3, each granular charcoal is polarized and acts as the carbon electrode DP2. As described above, since the granular charcoal is made into the carbon electrode DP2 by utilizing the electrostatic induction action, the particle size and shape of the granular charcoal are not limited, and various carbides such as activated carbon and charcoal can be used as the granular charcoal. it can.

  The mesh bag 50 and the mesh bag 52 are formed of a non-conductive material, and the mesh bag 50 is particularly preferably formed of a resinous flexible net. Moreover, the granular charcoal in the net bag 50 may be closely packed, or may be loosely packed. However, since a large amount of granular coal is filled in the mesh bag 50, it becomes difficult for raw water to flow into the gaps between the granular coals. Therefore, in order to make it easier for water to flow into the gaps between the granular coals, It is preferable to provide it close to the mesh bag 50.

Incidentally, water is also electrolyzed by the fixed electrode DP3 in Example 3 of FIG. 4 to generate HClO and ClO ^−, but the electrolytic current value of the fixed electrode DP3 is too large to prevent the carbon electrode DP2 from collapsing. Can not. For this reason, HClO and ClO ⁻ cannot be generated sufficiently, and thus an insoluble electrode DP1 (FIG. 1 (a)) that performs a separate increasing step is required. However, when the granular coal filled in the bag 50 is used as the carbon electrode DP2 as shown in FIG. 5, the granular coal may collapse, so the electrolytic current value of the fixed electrode DP3 is increased and the fixed coal DP3 is fixed. The step of increasing HClO and ClO ⁻ can be performed by electrolysis with the electrode DP3. That is, the fixed electrode DP3 can be used in place of the insoluble electrode DP1, and the insoluble electrode DP1 in FIG. 1A can be dispensed with. However, in this case, it is preferable to form the bag 50 with a nonwoven fabric or the like so that the powder of charcoal is not dispersed in the electrolyzed water due to the collapse of the granular charcoal.

In the method of the present invention, in addition to the procedures shown in FIGS. 2A to 2C, for example, an increase step may be performed after the pH adjustment step. If the final pH data of the electrolyzed water generated by such a procedure is collected in advance, it is necessary to control the electrolysis in the pH adjustment process based on this data, even if the pH adjustment is performed before the increase process. Electrolyzed water having the sterilizing power can be obtained.
In addition, after performing either one of the increasing process and the pH adjusting process, before performing the other process, after replenishing and mixing fresh raw water, the final process is performed by performing the other process. Producing the electrolyzed water and supplying the raw water to each of the first and second electrolyzers DS1 and DS2, and performing the increasing process and the pH adjusting process separately to produce the electrolyzed water in each electrolyzer DS1 and DS2. A procedure of generating final electrolyzed water by finally mixing the electrolyzed water may be adopted.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, two electrolytic cells are not necessarily provided, and both an insoluble electrode and a carbon electrode may be provided in one electrolytic cell. Further, both the insoluble electrode and the carbon electrode may be provided in the tank T, and the tank T itself may be an electrolytic cell. However, by providing two electrolytic cells as in the above-described embodiments, there are advantages that the maintainability is improved and the flow of water to each electrode is easily controlled.
Moreover, the electrode in the pH adjustment step does not need to be a carbon electrode at both electrodes as in the above embodiment, and at least the anode may be a carbon electrode. The cathode can be used regardless of metal or non-metal as long as it is an electrode formed of a conductive material.
Moreover, in order to remove the scale adhering to the cathode side of an electrode by electrolysis, you may make it switch periodically the polarity in each electrode of an insoluble electrode and a carbon electrode.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.

(A) is a schematic block diagram which shows the electrolyzed water generating apparatus concerning Example 1 of this invention, (b) is a flowchart which shows an example of control of the electric power feeding amount in a pH adjustment process. (A)-(c) is a block diagram which shows an example of a process procedure, (d) is a graph which shows the HClO density | concentration in the electrolyzed water produced | generated by the procedure of FIG. 2 (a)-(c), and the HClO density | concentration of a comparative example. is there. It is a schematic block diagram which shows the electrolyzed water generating apparatus concerning Example 2 of this invention. It is a schematic block diagram which shows the principal part of the electrolyzed water generating apparatus concerning Example 3 of this invention. It is a schematic block diagram which shows the modification of a carbon electrode.

Explanation of symbols

11, 21: DC power supply 41: pH measuring means 42: Controller (discriminating means)
DS1, DS2: electrolytic cell DP1: insoluble electrode DP2: carbon electrode E: set value TP: pH value range

Claims (5)

An electrolyzed water generating device of a non-membrane type that generates electrolyzed water having sterilizing power by electrolyzing water containing a chlorine component without using a diaphragm that divides the inside of the electrolytic cell into an anode chamber and a cathode chamber,
A first electrolytic cell having a pair of insoluble electrodes;
A first DC power source for applying a DC voltage to the insoluble electrode;
A second electrolytic cell having one or more carbon electrodes;
A second DC power source for applying a DC voltage to the carbon electrode,
In the first electrolytic cell, after performing an increasing step of increasing the concentration of HClO and ClO ⁻ contained in the electrolyzed water by direct current electrolysis of water using the insoluble electrode,
In the second electrolytic cell, electrolytic water for performing a pH adjustment step of adjusting pH of electrolytic water by generating carbon dioxide by direct current electrolysis of water using the carbon electrode and dissolving the carbon dioxide gas in the electrolytic water. An electrolyzed water generating apparatus that can be used in a generating method,
The carbon electrode in the pH adjustment step is constituted by one or more carbon electrodes that are detachably inserted between a pair of fixed electrodes connected to the second DC power source and are not connected to the power source. An electrolyzed water generator characterized by the above . An electrolyzed water generating device of a non-membrane type that generates electrolyzed water having sterilizing power by electrolyzing water containing a chlorine component without using a diaphragm that divides the inside of the electrolytic cell into an anode chamber and a cathode chamber,
A first electrolytic cell having a pair of insoluble electrodes;
A first DC power source for applying a DC voltage to the insoluble electrode;
A second electrolytic cell having one or more carbon electrodes;
A second DC power source for applying a DC voltage to the carbon electrode,
An increasing step of increasing the concentration of HClO and ClO ⁻ contained in the electrolyzed water by DC electrolysis of water by the insoluble electrode in the first electrolytic cell;
In the second electrolytic bath, generates carbon dioxide gas by direct current electrolysis of water by the carbon electrode, to dissolve the carbon dioxide gas in the electrolytic water, electrolytic performing the pH adjustment step of adjusting pH of the electrolyzed water at the same time An electrolyzed water generating apparatus that can be used in a method for generating water,
The carbon electrode in the pH adjustment step is constituted by one or more carbon electrodes that are detachably inserted between a pair of fixed electrodes connected to the second DC power source and are not connected to the power source. An electrolyzed water generator characterized by the above . In the electrolyzed water generating apparatus according to claim 1 or 2 ,
The carbon electrode in the pH adjusting step is constituted by a large number of granular charcoal filled in a bag . A method using the electrolyzed water generating device according to claim 1, 2 or 3 ,
PH measuring means for measuring the pH of the electrolyzed water generated in the pH adjusting step;
determining means for determining whether the measured value of the pH measuring means is within a predetermined pH value range;
A method for generating electrolyzed water that changes a power supply amount of supply power that contributes to electrolysis at the carbon electrode from the second DC power source according to a determination result of the determination unit. In claim 4,
When the measured value is larger than a predetermined pH value range, the power supply amount of the second DC power supply is made larger than a preset value,
When the measured value is less than or equal to a predetermined pH value range, a method of generating electrolyzed water in which the power supply amount of the second DC power supply is set to the set value or less or power supply is stopped.

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