JP2008055400A - Water generation method for sterilization by double electrolysis - Google Patents

Abstract

Disclosed is a method for producing water for sterilization in which hydrochloric acid is electrolyzed in a non-diaphragm electrolyzer and the electrolyte is diluted with water to produce water for sterilization. It is to be.
In order to solve this problem, two electrolytic cells on the upstream side and the downstream side are connected in series through a liquid passage, and hydrochloric acid is first electrolyzed in the upstream electrolytic cell, followed by downstream electrolysis. In the tank, the voltage between the opposing electrodes is made higher than the voltage between the opposing electrodes in the upstream electrolytic tank, and then electrolyzed, and then the discharged electrolyte is diluted with dilution water to generate sterilizing water. .
[Selection] Figure 7

Description

The present invention relates to a technique for electrolyzing hydrochloric acid in a non-diaphragm electrolytic cell and diluting an electrolytic solution with water to generate sterilizing water. More specifically, the present invention relates to a method of continuously performing electrolysis of hydrochloric acid in two electrolytic cells joined in series with a flow path, and diluting the electrolyte with water to generate sterilizing water.

A technique for electrolyzing hydrochloric acid and diluting an electrolytic solution with water to produce water for sterilization is conventionally known. For example, Patent Document 1 discloses a technique for electrolyzing dilute hydrochloric acid in a non-diaphragm electrolyzer to generate slightly acidic electrolyzed water that is a dilute solution of hypochlorous acid. According to Patent Document 1, chlorine produced by electrolysis of chlorine ions contained in dilute hydrochloric acid reacts with water to produce hypochlorous acid.

There is also a technique that has already been disclosed for a technique that uses two electrolytic cells. In Patent Document 2, acidic water generated in the anode chamber of the first diaphragm-type electrolytic cell is stored in a storage tank, and the characteristic value of acidic water deviates from a predetermined value due to deterioration during storage. Electrolysis is performed in a second diaphragm type electrolytic cell, and acidic water having a predetermined characteristic value is taken out from the anode side. In other words, the purpose of installing the second electrolytic cell is to re-electrolyze the acidic water again to convert it into acidic water having a predetermined effect when the effect of the acidic water being stored in the storage tank and being used becomes low. It is said to use without waste. Therefore, when acid water is generated, the electrolysis is not continuously performed in the second electrolytic cell, but the acidic water generation itself is completed in the first electrolytic cell, but it is stored after the generation. This is considered to be the purpose of avoiding the waste of electrolyzing again and discarding all of the deteriorated acidic water when the thing deteriorates. For that purpose, it is possible to use only one electrolytic cell, but the reason for having two electrolytic cells is that when electrolyzing degraded acid water, it is impossible to perform new electrolysis in one electrolytic cell. Presumed to avoid.

On the other hand, Patent Document 3 discloses a technique relating to the generation of electrolyzed water having at least a diaphragm type electrolytic cell 2. The purpose of this technique is to produce electrolyzed water according to the purpose of use by electrolyzing again the anode water, the cathode water or a mixture thereof electrolyzed in the primary electrolyzer in the secondary or later electrolyzer. Also, in electrolysis using a conventional diaphragm type electrolytic cell, electrolyzed water having different properties can be obtained on the cathode side and the anode side, but the other electrolyzed water of the target electrolyzed water was discarded as being almost useless. However, the purpose is to make it possible to use the useless electrolyzed water.
Japanese Patent Application No.8-309920 Japanese Patent Application No. 7-204191 Japanese Patent Application No. 8-14534

It is known that the sterilizing component of sterilizing water produced by electrolyzing hydrochloric acid and diluting the electrolytic solution with water is molecular hypochlorous acid. The form of molecular hypochlorous acid changes depending on the liquidity of the solution. When pH is high, it changes into hypochlorite ion and loses the bactericidal effect. On the other hand, if it is too low, it becomes chlorine gas and becomes unstable, and the storage stability is lost. The appropriate pH is 4 to 6.5. In the method of producing water for sterilization by electrolyzing hydrochloric acid, the operation of lowering the pH is easy, but it is not easy to raise it. It is the electrolytic rate of hydrochloric acid and the hardness of the diluted water that affect the pH. When soft water is used as dilution water, the pH is lowered, and in order to avoid this, it is essential to increase the electrolytic rate of hydrochloric acid.

By the way, since the method disclosed in Patent Document 1 uses only hydrochloric acid as a raw material, the pH is lowered if the diluted water has a small amount of neutralizing components such as soft water. On the other hand, in order to increase the electrolysis rate, it is necessary to electrolyze a liquid having a reduced hydrochloric acid concentration. Therefore, it is necessary to perform electrolysis at a voltage higher than the initial voltage. In order to perform such an operation in one electrolytic cell as shown in Patent Document 1, it is necessary to make the liquid in the electrolytic cell stay and perform electrolysis twice or more at different voltages. Efficiency is significantly reduced. Further, Patent Document 1 has no description about voltage fluctuation operation, and there is a description about generation of a flow-down method. Therefore, it is difficult to adjust pH, and pH reduction when soft water is used as dilution water is inevitable.

Although the method of patent document 2 uses the electrolytic cell of 2, the adjustment of the pH of electrolyzed water is not the objective. There is no mention of the electrolysis voltage of each electrolytic cell, nor is it intended to increase the electrolysis rate by changing the voltage. The purpose is re-electrolysis to avoid the disposal of degraded electrolyzed water, but because the diaphragm-type electrolyzer is also used for the second electrolyzer, about half of the water is thrown away even by re-electrolysis. The goal is achieved only half. Furthermore, if it is assumed that re-electrolysis is performed, it is necessary not to electrolyze almost all raw materials in the first electrolysis, but to leave a part unelectrolyzed.

The method of Patent Document 3 still uses a plurality of electrolytic cells, but all use diaphragm type electrolytic cells, and the purpose is not to adjust the pH, but to generate the desired electrolytic water. This is to reduce the waste of electrolyzed water generated at the opposite electrode, and to obtain electrolyzed water having the desired properties by performing electrolysis twice or more. However, since both electrolytic cells are diaphragm type electrolytic cells, two types of electrolyzed water are finally generated, and it is estimated that the inventor's purpose cannot be sufficiently achieved. Although there is no mention of electrolysis conditions, the role of the entire series of electrolyzers is simply one electrolyzer, and the residence time can be increased by increasing the electrode and capacity of the electrolyzer or reducing the amount of stock solution supplied to the electrolyzer. This is the same effect as increasing the electrolysis rate of the raw material, and in particular, the special effect due to the provision of a plurality of electrolytic cells cannot be expected. Further, as in Patent Document 2, it is assumed that re-electrolysis is performed, and it is necessary not to electrolyze almost all raw materials in the first electrolysis but to leave a part unelectrolyzed. It is not preferable in nature.

The problem to be solved by the present invention is that in a method of electrolyzing hydrochloric acid in a non-diaphragm electrolytic cell and diluting the electrolyte with water to produce sterilizing water, the pH does not become unnecessarily low even if the diluted water is soft water. It is to provide a method for producing water for sterilization.

The invention of claim 1 for solving this problem is the method of electrolyzing hydrochloric acid in a non-diaphragm electrolyzer and diluting the electrolyte with diluting water to make sterilizing water. First, the hydrochloric acid is first electrolyzed in the upstream electrolytic cell, and the electrolyte discharged from the upstream electrolytic cell is led to the downstream electrolytic cell through the liquid flowing channel. A method of generating sterilization water by diluting the discharged electrolyte solution with dilution water after electrolysis by making the voltage between the opposing electrodes higher in the electrolytic cell than the voltage between the opposing electrodes of the upstream electrolytic cell; It is a thing. By this method, even with an electrolytic solution that has been electrolyzed in the upstream electrolytic cell and the raw material hydrochloric acid has been reduced to increase the electrical resistance, electrolysis can be carried out at a higher voltage. As a result, the remaining hydrochloric acid is electrolyzed, and the sterilized water produced by dilution does not have an unnecessarily low pH even if the diluted water is soft water.

In the invention of claim 2 for solving this problem, the voltage between the opposing electrodes of the downstream electrolytic cell is 1.1 times or more the voltage between the opposing electrodes of the upstream electrolytic cell, 3.0 It is determined that it is not more than twice, more desirably not less than 1.5 times and not more than 2.5 times. Since the electrolytic solution flowing into the downstream electrolytic cell is already electrolyzed in the upstream electrolytic cell, the hydrochloric acid concentration is lowered and the electrical resistance is higher than that of the stock solution flowing into the upstream side. Therefore, in order to further proceed the electrolysis, it is necessary to apply a higher voltage than the upstream side, but if it is too high, chloric acids as by-products are generated, which is not preferable as sterilizing water used for sterilizing foods and the like. Electrolytic efficiency is high, and no by-product is generated. The range of the voltage between the electrodes facing the downstream electrolytic cell is 1.1 to 3.0 times the voltage between the electrodes facing the upstream electrolytic cell. Desirably, it is 1.5 times or more and 2.5 times or less.

The invention of claim 3 for solving this problem is that the power supply for supplying the electrolysis current to the upstream electrolyzer and the downstream electrolyzer is independent of each other, and the supply voltage and current can be set. is there. As described above, the upstream and downstream electrolytic cells are electrolyzed at different voltages, and thus independent power sources are used. Thereby, it is possible to set a voltage and an electric current value individually, and it is possible to set the most efficient electrolysis conditions.

On the other hand, the invention of claim 4 for solving this problem has a common power source for supplying an electrolysis current to the upstream electrolyzer and the downstream electrolyzer, and devised a circuit for supplying electricity to each electrolyzer. Thus, the voltage between the electrodes facing each other in the upstream electrolytic cell and the downstream electrolytic cell is changed. In this method, electricity is supplied from one power source to the upstream and downstream electrolytic cells, and a circuit for adjusting voltage or current or both is arranged between each electrolytic cell and the power source, and each electrolytic cell is provided. The desirable electrolysis conditions can be set. Since this method requires only one power source, there is an advantage that it is inexpensive and the apparatus can be downsized.

According to the invention of claim 5 for solving the problem, the control of the electrolysis state is performed such that the current value supplied to the upstream electrolyzer, the current value supplied to the downstream electrolyzer, or the upstream electrolysis is controlled. The determination is performed based on the total value of the current value supplied to the tank and the current value supplied to the downstream electrolytic tank. The amount of product of the electrolytic reaction is proportional to the amount of electricity obtained by integrating the current value with time. Therefore, in order to control the electrolysis state to be constant, the method of monitoring the current value and controlling it to be constant is optimal. In actual control, the supply amount of hydrochloric acid is adjusted so as to maintain a constant current value. In the method of monitoring the current value of the upstream electrolytic cell, the amount of product can be kept constant by making the supply amount of the raw hydrochloric acid constant with respect to the current. In the method of monitoring the current value of the downstream electrolytic cell, it is possible to keep the amount of product constant by monitoring the final electrolyte concentration. Moreover, the method of monitoring the total value of the current values supplied to both electrolytic cells can keep the amount of product constant by acting so that the electrolytic amount of one electrolytic cell supplements the other electrolytic cell. It is possible.

Invention of Claim 6 for solving this subject arrange | positions an ejector in the flow path of the water for dilution, and the electrolyte solution discharge port of the downstream electrolytic vessel and the suction port of the ejector are connected by the pipe line, The diluting water flow was used as a driving force to suck and dilute the electrolyte from the downstream electrolytic cell into the diluting water flow. By adopting such a structure, it is possible to avoid an excessive increase in the internal pressure of the electrolytic cell due to a pressure loss when the liquid flows through the two electrolytic cells. Furthermore, since it is not necessary to use a pump for supplying hydrochloric acid to the upstream electrolytic cell, the apparatus can be miniaturized.

The method for producing water for sterilization according to the present invention is a method in which hydrochloric acid is electrolyzed in a non-diaphragm electrolyzer, and the electrolyte is diluted with water for dilution to produce water for sterilization. Are joined in series, and hydrochloric acid is electrolyzed in the upstream electrolytic cell, and the discharged electrolytic solution is led to the downstream electrolytic cell through the flow path, and the voltage between the opposing electrodes is reduced in the downstream electrolytic cell. After the electrolysis with the voltage between the electrodes facing the upstream electrolyzer facing higher, the discharged electrolyte is diluted with diluting water to produce sterilizing water. This makes it possible to produce sterilizing water having an appropriate pH even if the hardness of the dilution water is low.

FIG. 1 is an example of a method for producing an electrolytic solution according to the present invention, and shows an example in which an electrolytic power source is provided for each electrolytic cell as a conceptual diagram. The raw material hydrochloric acid flows from the hydrochloric acid supply line 7 into the upstream electrolytic cell 1-1, is electrolyzed, flows through the liquid flow path 8, flows into the downstream electrolytic cell 1-2, is electrolyzed, and is discharged from the drainage line 9. Electrolysis electricity is supplied to the upstream electrolytic cell from the power source 2-1 by the power supply circuit 4-1. An ammeter 3-1 is disposed on the power supply circuit, monitors the electrolysis current, and sends a signal to the control device 6. Similarly, a power source and an ammeter are arranged in the downstream electrolytic cell 1-2.

FIG. 2 is an example of a method for producing an electrolytic solution according to the present invention, and shows an example in which power is transmitted from one electrolytic power source to each electrolytic cell via a voltage regulator. Electricity of different voltages is supplied from one power source to the upstream electrolytic cell and the downstream electrolytic cell via the voltage regulators 10-1 and 10-2, respectively. In this example, the current monitor 3 is disposed only in the upstream circuit, and the electrolysis is controlled only by the electrolytic current in the upstream electrolytic cell. The flow of hydrochloric acid and the arrangement of the electrolytic cell are the same as in FIG.

FIG. 3 shows an example of the method for producing the electrolytic solution of the present invention. In this example, one electrolytic power source is used, and the voltage setting between the electrodes (11) is performed by changing the number of electrodes of the bipolar electrolytic cell. A conceptual diagram is shown. In this example, the upstream electrolytic cell is a bipolar electrolytic cell configured with four electrodes, and the downstream electrolytic cell is configured with two electrodes. When a voltage is applied as it is to the electrolytic cell having such a configuration with the same power supply, the voltage between the electrodes facing the downstream electrolytic cell is three times the voltage between the electrodes facing the upstream electrolytic cell. Since the liquid in the downstream electrolytic cell has been electrolyzed in the upstream electrolytic cell, the electrical resistance is higher than that on the upstream side. Further, a voltage regulator is arranged on the power supply circuit to the downstream electrolytic cell, and the distribution of current to both electrolytic cells is adjusted by them.

FIG. 4 shows an example of a method for producing an electrolytic solution according to the present invention, which is an example in which an upstream electrolytic cell and a downstream electrolytic cell are arranged in a horizontal position in the same housing. Both electrolytic cells are of a bipolar type, and are composed of four electrodes on the upstream side and three electrodes on the downstream side. When electricity is supplied to the electrolytic cell configured as described above with one power source, the voltage between the electrodes facing the downstream electrolytic cell is 1.5 times the voltage between the electrodes facing the upstream electrolytic cell. Similar to the example of FIG. 3, a voltage regulator is disposed on the power supply circuit to the downstream electrolytic cell.

FIG. 5 shows an example of a method for producing an electrolytic solution of the present invention, which is an example in which an upstream electrolytic cell and a downstream electrolytic cell are arranged in a vertical position in the same housing. The function is the same as in the example of FIG. 4, and in this example, the voltage between the electrodes facing the downstream electrolytic cell is twice the voltage between the electrodes facing the upstream electrolytic cell.

FIG. 6 shows an example of a method for producing an electrolytic solution according to the present invention, in which pipe electrodes are arranged concentrically, an upstream electrolytic cell is constituted by a triple pipe, and a downstream electrolytic cell is constituted by a double pipe. This is a configured example. The dilution water flows into the innermost electrode from the dilution water inlet 19 and is discharged from the sterilizing water outlet 20. Hydrochloric acid is supplied from the hydrochloric acid supply line 7 to the upstream electrolytic cell and electrolyzed, and then flows into the downstream electrolytic cell through the liquid passage 8 and is electrolyzed. The electrolytic solution is discharged from the drainage passage 9 and mixed and diluted in the flow of dilution water. In this configuration, the voltage between the electrodes facing the downstream electrolytic cell is twice the voltage between the electrodes facing the upstream electrolytic cell.

FIG. 7 is a flowchart of the embodiment of the present invention. The upstream electrolytic cell and the downstream electrolytic cell have the same configuration. The electrode is a titanium plate having a thickness of 20 mm × 100 mm and a thickness of 1 mm, and only the anode is baked and coated with iridium oxide. is there. The drainage path of the downstream electrolytic cell is joined to the suction part of the ejector 25 (made by Hokuetsu Co., Ltd.), and the electrolyte is sucked and mixed into the flow of dilution water using the flow of dilution water as a driving force. Has been. Hydrochloric acid is diluted to a concentration of 6% by weight and is stored in a 2 L hydrochloric acid tank 21, and is supplied to the upstream electrolytic cell via the hydrochloric acid supply line 7 by the suction action of the ejector and the action of the tube pump 22 (made by Hokuetsu). Supplied. The tube pump also functions as a shut-off valve that prevents excessive suction of hydrochloric acid. MS-9-2 (Densei Lambda) was used as a power source for supplying electricity to the upstream electrolytic cell, and ZWS-30 (Densei Lambda) was used as the power source for the downstream electrolytic cell. An ammeter was installed in the power supply circuit to the downstream electrolytic cell, and the supply amount of hydrochloric acid was controlled so as to keep the electrolytic current in the downstream electrolytic cell constant. The diluted water passes through the electromagnetic valve 23, is adjusted to a constant flow rate by the flow rate adjusting valve 24, is sent to the ejector, and is discharged by diluting and diluting the electrolyte solution. When this apparatus was operated with dilution water having a total hardness of 20 ppm at a flow rate of 100 L / h, an upstream electrolytic cell of 2 V, and a downstream electrolytic cell of 3 V and 4 A, the sterilizing water having an effective chlorine concentration of 25 ppm and pH 5.8 was obtained. It was produced at 100 L / h.

FIG. 8 shows a flowchart of another embodiment of the present invention. An electrolytic cell (manufactured by Hokuetsu Co., Ltd.) is a lateral position in the same cylindrical housing and houses an upstream electrolytic cell and a downstream electrolytic cell. All the electrodes were 100 mm × 100 mm square titanium plates, and only the anode side was fired and coated with iridium oxide. The upstream electrolytic cell is a bipolar type constituted by four electrodes, and the downstream electrolytic cell is a bipolar type constituted by three electrodes. A hole formed in the upstream and downstream partition plates 16 was used as the liquid passage 8. One MS-11-6 (Densei Lambda) was used as the power source, and electricity was supplied to both electrolytic cells. A voltage regulator was installed on the feeder circuit of the downstream electrolytic cell, and the electrolytic voltage of the downstream electrolytic cell was set. In addition, an ammeter was provided on the feeding circuit of the downstream electrolytic cell, and the supply amount of hydrochloric acid was controlled so as to keep the electrolytic current in the downstream electrolytic cell constant. A hydrochloric acid electromagnetic valve 26 is disposed on the hydrochloric acid supply pipe, and the supply amount of hydrochloric acid is controlled by opening and closing the electromagnetic valve. The flow-down method of the dilution water is the same as that in the first embodiment. 6 wt% hydrochloric acid was stored in a 2 L hydrochloric acid tank and supplied to the upstream electrolytic cell. Using this device, tap water with a total hardness of 15 ppm is supplied as dilution water at 300 L / h, the calculated inter-electrode voltage of the upstream electrolytic cell is set to 2.2 V, and the calculated inter-electrode voltage of the downstream electrolytic cell is set to When the battery was operated at 3.0 V and the tank current controlled at 7 A, sterilizing water having a pH of 5.5 and an effective chlorine concentration of 20 ppm was obtained at 300 L / h.

Further, FIG. 9 shows a flow chart of still another embodiment of the present invention. An electrolytic cell (manufactured by Hokuetsu Co., Ltd.) is one in which an upstream electrolytic cell and a downstream electrolytic cell are accommodated in a vertical position in the same cylindrical housing. The electrode is a titanium plate having a size of 20 mm × 100 mm and a thickness of 1 mm, and the anode and the anode side are coated with iridium oxide on the surface only. The upstream electrolytic cell is a bipolar type composed of three electrodes, and the downstream electrolytic cell is composed of two electrodes. This is a mechanism that feeds power to both electrolytic cells from one power source VS75B (manufactured by Densei Lambda Co., Ltd.) and controls the supply amount of hydrochloric acid so that the total current value is kept constant. With this apparatus, diluted water with a total hardness of 20 ppm was set at a flow rate of 100 L / h, the upstream electrolytic cell was set at a calculated interelectrode voltage of 2.2 V, and the downstream electrolytic cell was controlled and operated at an interelectrode voltage of 4.5 V and 5 A. However, sterilizing water having an effective chlorine concentration of 25 ppm and a pH of 5.8 was produced at 100 L / h.

Further, FIG. 10 shows a flow chart of still another embodiment of the present invention. The electrolytic cell (made by Hokuetsu Co., Ltd.) is composed of cylindrical electrodes arranged concentrically. The upstream electrolytic cell is composed of a triple tube and the downstream side is composed of a double tube. Each electrode is a titanium pipe having a thickness of 1.5 mm, and the outer diameter and effective length are respectively the innermost electrode 12 of φ34.0 mm and 400 mm, the intermediate electrode 13 of φ48.6 mm and 180 mm, and the outermost electrode 14 of φ60. 0.5 mm and 400 mm, and the anode and the anode surface are baked with iridium oxide. Dilution water flows down inside the innermost electrode, and the electrolytic solution is arranged to be sucked, mixed and diluted from the drainage path 9 into the dilution water by the action of the ejector 25 disposed at the end of the innermost electrode. . The supply structure of hydrochloric acid is the same as in Examples 2 and 3. This apparatus controls the supply amount of hydrochloric acid so as to keep the total current value constant. The power source is configured to drive both electrolytic cells with one HWS150 (Densei Lambda). With this device, tap water with a total hardness of 15 ppm is supplied at 600 L / h, the calculated inter-electrode voltage of the upstream electrolytic cell is 2.2 V, the inter-electrode voltage of the downstream electrolytic cell is 4.5 V, and the total current is 20 A. Upon operation, sterilizing water having a pH of 5.8 and an effective chlorine concentration of 20 ppm was obtained at 600 L / h.

Since the method according to the present invention can be easily implemented and mass-produced, the industrial applicability is high.

It is a conceptual diagram of an electrolytic solution generation method in which an electrolytic power source is provided for each electrolytic cell. It is a conceptual diagram of the electrolytic solution production | generation method of the system transmitted to each electrolytic vessel through a voltage regulator from one electrolytic power supply. It is a conceptual diagram of the electrolytic solution production | generation method of the system which uses one electrolytic power supply and adjusts the voltage between electrodes by changing the number of electrodes of a bipolar electrolytic cell. It is a conceptual diagram of the electrolytic solution production | generation method which has arrange | positioned the upstream electrolytic cell and the downstream electrolytic cell in the horizontal position in the same housing | casing. It is a conceptual diagram of the electrolytic solution production | generation method which has arrange | positioned the upstream electrolytic cell and the downstream electrolytic cell in the vertical position in the same housing | casing. It is a conceptual diagram of the electrolytic solution production | generation method which arrange | positioned a pipe-shaped electrode concentrically, comprised the upstream electrolyzer with the triple pipe, and comprised the downstream electrolyzer with the double pipe. It is a flowchart of the water production apparatus for sterilization which provided the independent power supply in the upstream electrolyzer and the downstream electrolyzer. It is a flowchart of the water production | generation apparatus for sterilization provided with the electrolytic cell which has arrange | positioned the upstream electrolytic cell and the downstream electrolytic cell in the horizontal position in the same housing | casing. It is a flowchart of the water production | generation apparatus for sterilization provided with the electrolytic cell which has arrange | positioned the upstream electrolytic cell and the downstream electrolytic cell in the vertical position in the same housing | casing. It is a flowchart of the water generation apparatus for sterilization provided with the electrolytic cell comprised by the cylindrical electrode arrange | positioned concentrically.

Explanation of symbols

1-1 Upstream Electrolytic Cell 1-2 Downstream Electrolytic Cell 2 Electrolytic Power Source 2-1 Upstream Electrolytic Cell Electrolytic Power Source 2-2 Downstream Electrolytic Cell Electrolytic Power Source 3 Ammeter 3-1 Upstream Electrolytic Cell Ammeter 3-2 Ammeter for downstream electrolytic cell 4 Feeding circuit 4-1 Feeding circuit for upstream electrolytic cell 4-2 Feeding circuit for downstream electrolytic cell 5 Control signal circuit 6 Control device 7 Hydrochloric acid supply line 8 Liquid passage 9 Drainage path 10 Voltage regulator 10-1 Voltage regulator for upstream electrolytic equipment 10-2 Voltage regulator for downstream electrolytic equipment 11 Electrode 12 Inner electrode 13 Intermediate electrode 14 Outer electrode 15 Cylindrical electrolytic cell lower fixing plate 16 Electrolysis Tank partition plate 17 Cylindrical electrolytic cell upper fixing plate 18 Hydrochloric acid supply groove 19 Dilution water inlet 20 Disinfection water discharge port 21 Hydrochloric acid tank 22 Tube pump 23 Dilution water solenoid valve 24 Flow control valve 25 Ejector 26 Hydrochloric acid solenoid valve

Claims (6)

  In the method of electrolyzing hydrochloric acid in a non-diaphragm electrolytic cell and diluting the electrolytic solution with diluting water to make sterilizing water, two electrolytic cells on the upstream side and downstream side are joined in series through a liquid path, and hydrochloric acid is added to the upstream side. The electrolytic solution electrolyzed in the electrolytic cell on the side and discharged from the upstream electrolytic cell is guided to the downstream electrolytic cell through the liquid passage, and the voltage between the opposing electrodes in the downstream electrolytic cell. The electrolytic solution is made higher than the voltage between the opposing electrodes of the upstream electrolytic cell, the electrolytic solution is discharged, and the discharged electrolytic solution is diluted with diluting water to produce sterilizing water. Water generation method for sterilization The voltage between the opposing electrodes of the downstream electrolytic cell is 1.1 times or more and 3.0 times or less, more preferably 1.5 times the voltage between the opposing electrodes of the upstream electrolytic cell. The method for producing water for sterilization according to claim 1, wherein the sterilization water is 2.5 times or more and 2.5 times or less. 3. A power supply for supplying an electrolysis current to the upstream electrolyzer and the downstream electrolyzer is independent of each other, and the supply voltage and current can be set. Water generation method for sterilization The power supply for supplying an electrolytic current to the upstream electrolytic cell and the downstream electrolytic cell is common, and the upstream electrolytic cell and the downstream side are devised by devising an electric supply circuit to each electrolytic cell. The method for producing water for sterilization according to claim 1 or 2, wherein the voltage between the electrodes facing each other is changed. The control of the electrolysis state is performed by controlling the current value supplied to the upstream electrolytic cell, the current value supplied to the downstream electrolytic cell, or the current value supplied to the upstream electrolytic cell and the downstream side. The method for producing water for sterilization according to any one of claims 1 to 4, wherein the method is performed based on a total value of current values supplied to the electrolytic cell. An ejector is disposed in the flow path of the dilution water, the electrolyte outlet of the downstream electrolytic cell and the suction port of the ejector are connected by a pipe line, and the flow of the dilution water is used as a driving force, The method for producing sterilizing water according to any one of claims 1 to 5, characterized in that the electrolytic solution is sucked into a flow of dilution water from a downstream electrolytic cell and diluted.

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