JPH02149395A - Apparatus and method of preparing aqueous disinfectant - Google Patents

Abstract

PURPOSE:To continuously prepare a disinfecting solution adjusted to a predetermined range of the concentration and pH of residual chlorine by electrolyzing an aqueous NaCl solution in a diaphragm cell and producing on an anode side the water high in the concentration of the residual chlorine, which is mixed with a dilution water for dilution. CONSTITUTION:An electrolyzer 2 is provided consisting of a DC electric source device 17 for electrolysis, an anode 13, a cathode 14 and a diaphragm 16 between these two electrodes for dividing the electrolyzer into anode and cathode chambers. The solution to be electrolyzed produced by mixing the water supplied from a water introducing pipe 3 and an aqueous NaCl solution supplied from an aqueous NaCl solution adding means 11 is supplied from an introducing pipe 5 to the anode and cathode chambers and the resulting solution is drawn out from the anode and cathode chambers through discharging pipes 18 and 19, respectively. At a diluting part 26, moreover, the aforesaid solution drawn out from the anode chamber and the water supplied from a dilution water conduit pipe 24 braching off from the water introducing pipe 3 are mixed for dilution. As a result, a continuous preparation can be made of an aqueous disinfectant of predetermined concentration and pH of residual chlorine.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an apparatus and method for producing sterilized water for use in cooking environment hygiene, hand washing, food materials, wet towels, etc. , an apparatus that can produce safe sterilized water at low cost by further mixing and diluting water with a high residual chlorine concentration generated on the anode side with raw water for dilution and/or water generated on the cathode side by diaphragm electrolysis of an aqueous sodium chloride solution, and The present invention relates to a method for producing the sterilized water.

(Prior Art) Conventionally, various devices are known as bacteria sterilization devices. For example, devices that use heat treatment, alcohol treatment, ultraviolet irradiation, oxidation with ozone, etc., and devices that use diluted aqueous solutions of hypochlorous acid or sodium hypochlorite to sterilize tableware, food, and tap water are widely used. It is used.

By the way, it is industrially possible to produce sodium hypochlorite by non-diaphragm electrolysis of seawater and a highly concentrated sodium chloride aqueous solution, or to produce chlorine gas on the anode side and caustic soda on the cathode side in diaphragm electrolysis. This has been traditionally done. In addition, "Generation of hypochlorite by non-diaphragm direct electrolysis of a low-concentration saline solution close to fresh water" is covered in Electrochemistry and Industrial Physical Chemistry 56. N05 (198
8). Furthermore, JP-A-61-28339
No. 1 describes a method for sterilizing drinking water by converting small amounts of chlorine ions contained in tap water into chlorine.

In this way, in the case of so-called chlorine sterilization, which involves injecting chlorine gas into water or using a dilute aqueous solution of sodium hypochlorite, the abundance ratio of residual chlorine changes depending on the pH of the aqueous solution (see Figure 1O). Accordingly, the sterilizing effect varies even with the same residual chlorine concentration. P with a high abundance of hypochlorous acid (HCI20), which is said to have the greatest bactericidal effect.
H range, that is, pH 3 to 7, preferably pH 4 to 6, a large sterilizing effect can be exhibited even at a low residual chlorine concentration.

(Problem to be Solved by the Invention) However, the pH of commonly used tap water (hereinafter referred to as "raw water") is generally within the range of 5.8 to 8.6.
Most are around H7. Therefore, it is not possible to control the pH within the above range simply by injecting chlorine gas into water or adding an aqueous solution of hypochlorous acid or sodium hypochlorite. Therefore, for example, in order to sterilize spore-forming bacteria that have strong sterilization resistance, it is necessary to increase the residual chlorine concentration or to control pT by adding an appropriate amount of an acid such as hydrochloric acid.

In addition, generally, an aqueous solution of sodium hypochlorite is manufactured in a place other than where it is used and is supplied in a container, so tap water and an aqueous sodium hypochlorite solution are placed in separate containers. In many cases, sterilized water is mixed and diluted to a predetermined concentration and then used as a toilet, which is a so-called reservoir type, and sterilized water cannot be used continuously.

For this reason, tableware and cooking utensils 1 are used in restaurant kitchens, food factories, etc.
When used for sterilizing food items 1 such as hand washing and wet towels, there were problems in terms of operability, safety, sterilizing effect, etc.

On the other hand, in a device that produces sodium hypochlorite from an aqueous sodium chloride solution by non-diaphragm electrolysis, due to its structure, the products on the anode and cathode sides immediately undergo a neutralization reaction, so the pH is set to be more acidic than the raw water. It is impossible to do so.

In addition, in the method of converting a small amount of chlorine ions contained in tap water into chlorine, disclosed in JP-A No. 61-283391,
Because the electrical conductivity is low, only a small current can flow, and it takes a long time to increase the residual chlorine concentration.
I can't control H.

The present invention solves the above-mentioned problems and provides tableware and cooking utensils.
An object of the present invention is to provide a sterilizing water producing device and a sterilizing water producing method capable of continuously producing sterilizing water having a residual chlorine concentration and pH suitable for sterilizing food items 1, hand washing, wet towels, etc.

(Means for Solving the Problems) As a result of extensive research to achieve the above object, the present inventors electrolyzed a sodium chloride aqueous solution with the right corner membrane to produce water with a high concentration of residual chlorine on the anode side. It has been discovered that sterilizing water having a residual chlorine concentration and pH suitable for sterilization can be produced by mixing and diluting with raw water for dilution and/or alkaline water generated on the cathode side, and in completing the present invention. It's arrived.

That is, the sterilized water production device of the present invention has a DC power supply for electrolysis, a near node and a cathode, and a diaphragm between both electrodes, and an electrolytic cell separated into an anode chamber and a cathode chamber; supplied from a raw water introduction pipe. An introduction pipe that supplies electrolyzed water, which is a mixture of raw water and a sodium chloride aqueous solution supplied from a sodium chloride aqueous solution adding means, to the anode chamber and the cathode chamber; an extraction pipe; a means for mixing and diluting the produced water taken out from the anode chamber with raw water supplied from a dilution raw water conduit branched from the raw water introduction pipe and/or produced water taken out from the cathode chamber; The method for producing sterilized water of the present invention is characterized in that the water to be electrolyzed, which is a mixture of an aqueous sodium chloride solution and raw water supplied from a raw water introduction pipe, is subjected to an electrolysis process having an anode chamber and a cathode chamber. Raw water supplied to the tank for electrolysis, and then taken out from the anode chamber, is supplied from a dilution raw water conduit branched in the middle of the raw water introduction pipe, and/or generated water taken out from the cathode chamber. It is characterized by mixing and diluting with.

By providing a means for diluting with raw water, it is possible to dilute the water with a high residual chlorine concentration generated on the anode side to a predetermined concentration, control the pH, and further increase the amount of sterilizing water to several times the amount of water generated on the anode side. It becomes possible to do so.

On the other hand, providing a means for diluting with water produced on the cathode side is
This is mainly for controlling pH. However, since the cathode-side generated water increases the pH even when added in a small amount, the amount of sterilizing water cannot be increased much.

Furthermore, by providing means for adding both raw water and cathode-side produced water, the pH can be controlled and the amount of sterilized water can be adjusted in various ways, making it more advantageous as a sterilized water production device.

Note that these operations may be performed manually or may be automatically controlled by providing a device that continuously measures the residual chlorine concentration and pH in the sterilized water so that each value is maintained within a set range. If automatic control is used, sterilized water with stable properties can be easily supplied without the need for manpower, regardless of changes in the supply pressure, pH, electrical conductivity, etc. of raw water.

Next, a detailed explanation will be given based on the drawings.

1 to 3 show an example of the sterilized water production apparatus of the present invention which is manually operated.

FIG. 1 is a schematic system diagram when the anode side generated water is mixed and diluted with only the dilution raw water, and FIG. 2 is a schematic system diagram when the anode side generated water is mixed and diluted with both the dilution raw water and the cathode side generated water.
FIG. 3 is a schematic system diagram in the case of dilution with only the water produced on the cathode side.

First, the electrolytic cell will be explained. The electrolytic cell is casing 1
2a, 12b, anode 13, spacer 15a, 15
b, a diaphragm 16 and a cathode 14.

Although the figure shows a single-vessel flat plate type, a multi-vessel flat plate type or cylindrical type in which the number of these types is increased may also be used. From the viewpoint of manufacturing and processing, a flat plate type is preferable.

The spacer 15 plays the role of setting the distance between the electrodes and ensuring a flow path for the water to be electrolyzed. If the spacer is made thinner and the distance between the electrodes is reduced, electrolysis can be performed at a lower voltage, but the flow rate of the water to be electrolyzed will increase and the pressure loss will increase, so both conditions should be considered when selecting the thickness. In the example shown in the figure, the thickness of the spacer was 3 mm and the distance between the electrodes was set.

The diaphragm 16 uses a neutral membrane that allows both cations and anions to pass through, and its material is preferably a fluorine-based material that is not affected by chlorine gas generated on the anode side. Hydrocarbon-based diaphragms are susceptible to chlorine gas and are not practical. Moreover, a material with high water permeability reduces the effect of the diaphragm, so a material with a small water permeability is preferable.

The material of the anode 13 has a large effect on the electrolysis efficiency, so it is preferable that the material has a small chlorine overvoltage and a large oxygen overvoltage. In the example shown in the figure, a titanium plate with a strong catalytic effect coated with platinum and iridium is used to facilitate the oxidation reaction of chlorine ions and efficiently generate free chlorine, which is effective for sterilization. I decided to do so.

Although titanium is used for the cathode 14 in consideration of corrosion resistance, stainless steel may also be used.

Each element constituting the manufacturing apparatus of the present invention is connected as follows.

First, the anode 13, cathode 14 and DC power supply 1
7 is electrically connected.

The anode chamber and cathode chamber of the electrolytic cell and the raw water introduction pipe 3 are connected via an anode-side electrolyzed water introduction pipe 8 , a cathode-side electrolyzed water introduction pipe 9 , and an electrolyzed water introduction pipe 5 .

A sodium chloride aqueous solution storage tank 10 is connected to the flow path of the electrolyzed water introduction pipe 5 via a sodium chloride aqueous solution addition pump 11 in order to supply the sodium chloride aqueous solution. An anode side generated water outlet pipe 18 and a cathode side generated water outlet pipe 19 are connected to the anode chamber and the cathode chamber, respectively. Furthermore, the anode-side produced water outlet pipe 18 , the dilution raw water conduit 24 , and/or the cathode-side produced water mixing pipe 23 are connected to the mixing/dilution section 26 . Dilution water conduit 2
4 is connected to the raw water branch 4.

In addition, the dilution raw water conduit 24. Cathode side generated water mixing pipe 2
3. Each flow path of the cathode-side generated water drain pipe 22 is provided with a flow rate control valve 25°21.20 at an appropriate position.

FIGS. 4 to 6 show an apparatus in which the apparatus shown in FIGS. 1 to 3 is provided with an automatic control circuit for the residual chlorine concentration and pH of the sterilizing water.

That is, the sterile water discharge pipe 2 connected to the mixing dilution section 26
A residual chlorine concentration measuring device 30 and a pH measuring device 33 are disposed in the flow path No. 7.

When diluting with only raw water for dilution, as shown in FIG. 4, the residual chlorine concentration measuring device 30° controller 31. Between the controller 32 and the DC power supply device 17 and the pH measuring device 33. The controller 34, the controller 35, and the dilution raw water flow rate control valve 25 are electrically connected to each other.

When diluting with both raw water for dilution and water produced on the cathode side, as shown in FIG. 5, a residual chlorine concentration measuring device 30.
Controller 31. Between the controller 32 and the DC power supply 17, the pH measuring device 33. Controller 34. Controller 35
and the dilution raw water flow rate control valve 25, and the pH measuring device 33. Between the controller 34, the controller 35 and the cathode-side generated water flow rate control valve 21, and the pH measuring device 33. controller 3
4. Controller 35 and cathode side generated water drainage flow rate control valve 20
The two are electrically connected to each other.

In addition, when diluting with only the cathode-side generated water, as shown in FIG. 6, a residual chlorine concentration measuring device 30, a controller 31. Between the controller 32 and the DC power supply 17, the pH measuring device 33. Controller 34. The controller 35 and the cathode side generated water flow rate control valve 21 are electrically connected to each other, the pH measuring device 33° controller 34, and the controller 35 and the cathode side generated water drainage flow rate control valve 20 are electrically connected to each other.

That is, the signals from the residual chlorine concentration measuring device 30 and the pH measuring device 33 are compared with preset values, and the electrolytic current, the dilution raw water flow rate, the cathode side produced water mixing flow rate, and the drainage flow rate are determined. The configuration is such that the residual chlorine concentration and pH of the sterilized water are always maintained within a set range.

In this way, by measuring and feeding back the residual chlorine concentration and pH of sterilizing water and automatically controlling it, the properties of sterilizing water can be kept stable even when changes in raw water supply pressure, pH, electrical conductivity, etc. can.

7 to 9 show block diagrams of automatic control. 7th
The figures correspond to the apparatus shown in FIG. 4, FIG. 8 to FIG. 5, and FIG. 9 to FIG. 6, respectively. The method of controlling the residual chlorine concentration of sterilizing water shown here is a method of controlling the electrolytic current, and is a method that is highly accurate and easy to systemize. Although not shown, in addition to this, the concentration of sodium chloride aqueous solution,
There is a method of controlling electrolysis conditions such as the amount of water to be electrolyzed and the flow rate of raw water for dilution. However, those methods are more complex than the illustrated method. Note that here, the concentration of the sodium chloride aqueous solution and the amount of water to be electrolyzed are constant.

The electric circuit that automatically controls the residual chlorine concentration of sterilizing water is the residual chlorine concentration measuring device 30. Controller 31 that converts electrical signals. It is composed of a controller 32 and a DC power supply device 17. On the other hand, the electric circuit that automatically controls the pH of sterilized water is
pH measuring device 33. Controller 34 for converting electrical signals. It is composed of a controller 35, a dilution water amount control valve 25, a cathode side generated water flow rate control valve 21, and a cathode side generated water drainage flow rate control valve 20.

Further, if the residual chlorine concentration or pH of the sterilizing water significantly deviates from the set range due to equipment failure or the like, an alarm may be issued, for example.

Fluctuations in the electrolyzed current due to temporal fluctuations in the supply pressure of raw water,
Alternatively, if there are many disturbances such as seasonal fluctuations in the pH and electrical conductivity of raw water, it is preferable to use a device equipped with an automatic control circuit.

The residual chlorine concentration in the sterilized water is measured using the residual chlorine concentration measuring device 30.
Continuously measured by The concentration signal is fed back to the controller 32 via the controller 31. The controller 32 compares the reference residual chlorine concentration set value with the feedback signal, and adjusts the DC power supply 17 according to the deviation.
to control the electrolytic current. The relationship between the residual chlorine concentration and the OXX current used in this calculation can be obtained from FIGS. 11 and 13.

The pH in the sterilized water is continuously measured by the pH measuring device 33. The pH signal is fed back to the controller 35 via the controller 34. The controller 35 compares the reference pH setting value with the feedback signal converted by the controller 34, and depending on the deviation, controls the dilution raw water flow rate control valve 25 and/or the cathode side generated water flow rate control valve 2.
1 and the cathode side produced water drainage flow rate control valve 20 to control the amount of mixing and dilution water. The relationship between pH and Ox specific electric current used in this calculation can be obtained from FIGS. 12 and 14.

(Function) According to the apparatus of the present invention, sterilized water can be produced by electrolyzing a sodium chloride aqueous solution with the right corner membrane.
The reaction in the electrolytic cell is as follows.

The water to be electrolyzed is electrolyzed by direct current. On the anode side, chlorine ions become hypochlorous acid through the following reaction, and on the cathode side, sodium ions and water react to produce caustic soda and hydrogen gas. Also, in this reaction, the anode side becomes acidic and the cathode side becomes alkaline.

Anode side: 2 CI2- = CI2 g + 2 eCβ, +H
iO-IH"+Cβ-+HCl20 cathode side: 2 Na" + 2 Ht O+ 26-2NaO
H+H*T Note that the abundance ratio of hypochlorous acid (HCJ20) changes depending on the pH as described above.

In addition, the residual chlorine concentration and pH of the water produced on the anode side change depending on the amount of water to be electrolyzed and the electrolytic current (hereinafter referred to as "OXX current"), and as the Ox specific current increases, the residual chlorine concentration increases, and the PL (pl) decreases. By decreasing the Ox specific electric current, the residual chlorine concentration will decrease, and the pH will approach neutrality (
(See Figures 11 and 12). Here, ox specific electric current is calculated by the following formula.

OXX electric current coulomb/I2) Anode side electrolyzed water amount (I2/mlnl) However, if the Ox specific electric current amount is excessive, the water temperature will rise due to Joule heat, which is dangerous.

The water with a high residual chlorine concentration generated on the anode side is combined with the raw water for dilution branched off at the raw water branch and/or the water generated on the cathode side, where it is mixed and diluted, and the residual chlorine concentration and pH are controlled within the set range. It is discharged from the device as sterile water. When the cathode-side generated water is not mixed or when the mixed amount is small and there is a surplus, the cathode-side generated water is discharged to the outside of the apparatus via the cathode-side generated wastewater flow rate control valve.

Hereinafter, the operation of the present invention will be explained in more detail based on FIGS. 1 to 3.

First, the sodium chloride aqueous solution has a concentration of, for example, 5 to 10%, and is added from the storage tank 10 to the water to be electrolyzed inlet pipe 5 by the addition pump 11 so as to have a predetermined concentration.

The water to be electrolyzed is supplied to the electrolytic cell 2 via an anode-side electrolyzed water introduction pipe 8 and a cathode-side electrolyzed water introduction pipe 9, and is electrolyzed by a DC power supply 17. Then, they become acidic water and alkaline water, respectively, and the generated water outlet pipe 1 on the anode side
8. The generated water is discharged from the cathode side discharge pipe 19. The amount of water to be electrolyzed is adjusted by a control valve 6.7, and the electrolysis current is adjusted by a DC power supply 17. This DC power supply device 1
No. 7 has a constant current control device so as to be able to respond to changes in the electrical conductivity of raw water, etc., and can maintain the electrolytic current at a set value.

The raw water for dilution separated in the raw water branching section 4 is passed through the raw water conduit 24 for dilution without adding an aqueous sodium chloride solution and without passing through the electrolytic cell 2, and the residual chlorine generated on the anode side is removed in the mixing dilution section 26. Mix and dilute with highly concentrated water.

The flow rate of the raw water for dilution is adjusted by the flow control valve 25 so that the sterilized water has a predetermined residual chlorine concentration and pH range. In addition, as shown in FIGS. 2 and 3, when mixing with cathode-side generated water, adjust the cathode-side generated water flow rate control valve 21 and the cathode-side generated water drainage flow rate control valve 20 and use the mixing dilution section 26. By merging them together, the pH can be adjusted.

As a result, sterilized water whose residual chlorine concentration and pH are adjusted within a predetermined range is produced and discharged from the sterilized water discharge pipe 27.

(Example) Hereinafter, an example of sterilized water produced by the production apparatus of the present invention having specifications shown in Table 1 will be described.

First surface: Charcoal-charcoal conductivity: 138 uS/cm, pH: 7.6, residual chlorine concentration: 0. A 5% concentration sodium chloride aqueous solution was added to lppm raw water at a rate of 2β/min, anode side electrolyzed water amount 12/min, cathode side electrolyzed water amount IJ2/min, at 50 c.
c/min to bring the sodium chloride concentration to 1250 p.
It was set as pm. As a result, the electrical conductivity of the water to be electrolyzed is approximately 22
It rose to 00 μS/cm.

When this electrolyzed water is electrolyzed with a voltage of 7V and an electrolytic current of 6A,
The water produced on the anode side has a pH of 2.7 and a residual chlorine concentration of 70pp.
m, the cathode side generated water has a pH of 11.4 and a residual chlorine concentration of 0.
．． It was 3 ppm.

Add raw water to this anode side generated water II2 as dilution water.
When f2 was mixed, the pH was 6.1 and the residual chlorine concentration was 15p.
5 pm of sterile water was obtained.

Contrary 1 When the anode-side produced water 1β obtained in Example 1 was mixed with 42% of raw water and 0.312% of the cathode-side produced water as dilution water, 5.3β of sterilized water with a pH of 7.0 and a residual chlorine concentration of 15 ppm was obtained. Obtained.

! Group 1 When 0.6 degrees of the cathode side generated water was mixed as dilution water to 1°C of the anode side generated water obtained in Example 1, the pH
6,9, 1.62 sterilized water with a residual chlorine concentration of 50 ppm was obtained.

Kyotane Mawari A Electrical conductivity 139 μS/cm, pH 7.4, residual chlorine concentration 0. A 5% concentration sodium chloride aqueous solution was added to lppm raw water at a rate of 2°C/min, the amount of electrolyzed water on the anode side II2/min and the amount of electrolyzed water on the cathode side II2/min at 50°C.
cc/min, and the sodium chloride concentration was 125
It was set to 0 ppm. As a result, the electrical conductivity of the water to be electrolyzed increased to about 2200 μS/cm.

When this water to be electrolyzed is electrolyzed with a voltage of 12V and an electrolytic current of 11A, the water produced on the anode side has a pH of 2.8 and a residual chlorine concentration of 16.
The pH of the water produced on the cathode side was 11.5°, and the residual chlorine concentration was 0.3 ppm.

Add raw water as dilution water to this anode-side generated water 1β at 3°C.
When mixed, p) I! 5.8. Residual chlorine concentration 40p
pm sterilized water 4I2 was obtained.

K Jyojo 1 To the anode side generated water II2 obtained in Example 4, 312% of raw water and 0.312% of cathode side generated water were added as dilution water.
When mixed, the pH was 6.6 and the residual chlorine concentration was 40 pp.
m of sterilized water at 4.3°C was obtained.

When the anode side generated water II2 obtained in Example 4 was mixed with the cathode side generated water at 0.6°C as dilution water, p
H6.8, sterilized water with residual chlorine concentration 100 ppm 1.6
12 were obtained.

Note that Tables 2 and 3 show the results of sterilization tests using these sterilized waters.

(Effects of the Invention) According to the apparatus of the present invention, a sodium chloride aqueous solution is subjected to finite membrane electrolysis to generate water with a high residual chlorine concentration on the anode side, which is mixed and diluted with raw water for dilution and/or water produced on the cathode side. By doing so, sterilized water with residual chlorine concentration and pH controlled within a predetermined range can be continuously produced.

pH 4 to 6 with a high abundance of hypochlorous acid, which has a large bactericidal effect
Because it can be used with aqueous diluted hypochlorous acid solution, it can exhibit the same sterilizing effect as conventional methods even with a lower residual chlorine concentration than diluted hypochlorous acid aqueous solution.

In addition, it is superior in terms of safety and operability because it can produce sterilized water with simple operations, and it is also extremely superior in that it can continuously supply the required amount of sterilized water at the place of use. There is. Therefore, we can provide low-cost sterilized water that can be used in a wide range of fields, including sterilized water for cooking environment hygiene, 1 for hand washing, 3 for food ingredients, and for wet towels, as well as food processing and distribution fields, drinking water, pool water, and medical fields. Available in

Furthermore, if a circuit is installed to automatically control the residual chlorine concentration and pH of sterilized water, the supply pressure of raw water can be reduced.

Stable sterilizing water can be supplied regardless of changes in pH, electrical conductivity, etc., and the sterilizing effect can be further enhanced. Further, adjustment and monitoring work such as flow rate adjustment and current adjustment is not required, resulting in labor savings.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic system diagrams of the sterilized water production apparatus of the present invention, and Figures 4 to 9 are schematic system diagrams and electric circuit block diagrams of the sterilized water production apparatus equipped with an automatic control circuit. can be,
Figure 10 is a diagram showing the relationship between free chlorine concentration abundance ratio and pH, Figure 11 is a diagram showing an example of the relationship between Ox specific electric current and residual chlorine concentration, and Figure 12 is a diagram showing an example of the relationship between Ox specific electric current and residual chlorine concentration.
FIG. 13 is a diagram showing an example of the relationship between dilution ratio and residual chlorine concentration, and FIG. 14 is a diagram showing an example of the relationship between dilution ratio and pH. l: Sterilized water production device, 2: Electrolytic cell, 3: Raw water introduction pipe, 4
: Raw water branch, 5: Electrolyzed water introduction pipe, 6: Anode side electrolyzed water flow control valve, 7: Cathode side electrolyzed water flow control valve, 8 Near node side electrolyzed water introduction pipe, 9: Cathode side electrolyzed water introduction Tube, lO: Sodium chloride aqueous solution storage tank, l:
Sodium chloride aqueous solution addition pump, 12a, 12b: Electrolytic cell casing, 13 near node, 14: cathode, 1
5a, 15b spacer - 116: diaphragm, 17: DC electrolyzer, 18 near node side generated water outlet pipe, 19: cathode side generated water outlet pipe, 20: cathode side generated water drainage flow rate control valve, 21: cathode side generated water flow rate Control valve, 22: Cathode side generated water drain pipe, 23: Cathode side generated water mixing pipe,
24: Raw water conduit for dilution, 25: Raw water flow rate control valve for dilution,
26: Mixing dilution section, 27: Sterilizing water discharge pipe, 30: Residual chlorine concentration measuring device, 31: Controller, 32: Controller, 33: pH measuring device, 34: Controller, 35:
controller

Claims (9)

[Claims] (1) DC power supply device for electrolysis; An electrolytic cell that has a diaphragm between the anode and cathode and both electrodes and is separated into an anode chamber and a cathode chamber; Raw water supplied from the raw water introduction pipe and addition of an aqueous sodium chloride solution An inlet pipe for supplying electrolyzed water mixed with an aqueous sodium chloride solution supplied from the means to the anode chamber and the cathode chamber; an outlet pipe for taking out produced water from each of the anode chamber and the cathode chamber; the anode chamber A device for producing sterilized water, comprising: means for mixing and diluting produced water taken out from the source and raw water supplied from a dilution raw water conduit branched midway through the raw water introduction pipe. (2) In the sterilized water production apparatus according to claim 1, means for mixing and diluting the produced water taken out from the anode chamber and the raw water supplied from the dilution raw water conduit branched midway through the raw water introduction pipe. Instead, a means for mixing and diluting the produced water taken out from the anode chamber with the raw water supplied from the dilution raw water conduit branched in the middle of the raw water introduction pipe and the produced water taken out from the cathode chamber is provided. Sterilized water production equipment. (3) In the sterilized water production apparatus according to claim 1, means for mixing and diluting the produced water taken out from the anode chamber and the raw water supplied from the dilution raw water conduit branched midway through the raw water introduction pipe. Instead, a sterilized water production device has means for mixing and diluting the produced water taken out from the anode chamber and the produced water taken out from the cathode chamber. (4) In the sterilized water production device according to claim 1, a flow rate control valve is provided in the flow path of the raw water conduit for dilution, and sterilized water remains in the flow path of the sterilized water discharge pipe connected after the mixing and dilution section. A device to measure chlorine concentration and a device to measure pH are installed.
Electrically connect the residual chlorine concentration measuring device and the DC power supply device and the pH measuring device and the dilution raw water flow rate control valve, respectively, and set the signals from the residual chlorine concentration measuring device and the pH measuring device in advance. Sterilizing water production characterized by being equipped with an automatic control circuit that controls the electrolytic current and the flow rate of raw water for dilution and always maintains the residual chlorine concentration and pH of the sterilizing water within a set range by comparing them with the set values. Device. (5) In the sterilized water production device according to claim 2, there is a dilution raw water flow rate control valve in the flow path of the dilution raw water conduit and a flow path of the cathode side generated water outlet pipe, and a cathode side generated water flow rate control valve and the cathode side generated water flow rate control valve. A generated water drainage flow rate control valve is installed, and
A device for measuring the residual chlorine concentration of the sterilizing water and a device for measuring the pH are installed in the flow path of the sterilizing water discharge pipe connected after the mixing dilution section, and between the residual chlorine concentration measuring device and the DC power supply device,
Electrically connect the pH measurement device and the dilution raw water flow rate control valve, the pH measurement device and the cathode side generated water flow rate control valve, and the pH measurement device and the cathode side generated water drainage flow rate control valve, respectively. The signals from the residual chlorine concentration measuring device and the pH measuring device are compared with preset values to control the electrolytic current, the flow rate of raw water for dilution, the mixing flow rate of produced water on the cathode side, and the flow rate of waste water produced on the cathode side. A sterilized water production device characterized by being provided with an automatic control circuit that always maintains the residual chlorine concentration and pH of the sterilized water within a set range. (6) In the sterilized water production device according to claim 3, a cathode-side produced water flow rate control valve and a cathode-side produced water drainage flow rate control valve are provided in the flow path of the cathode-side produced water outlet pipe, and after the mixing and dilution section. A device for measuring the residual chlorine concentration of the sterilizing water and a device for measuring the pH are installed in the flow path of the sterilizing water discharge pipe to be connected, and between the residual chlorine concentration measuring device and the DC power supply device,
The H measuring device and the cathode side generated water flow rate control valve are electrically connected, and the pH measuring device and the cathode side generated water drainage flow rate control valve are electrically connected, respectively, and the signals from the residual chlorine concentration measuring device and the pH measuring device are connected in advance. An automatic control circuit that compares the electrolytic current, cathode side generated water mixing flow rate, and cathode side generated water drainage flow rate with the set values, and always maintains the residual chlorine concentration and pH of the sterilizing water within the set range. A sterilized water production device characterized by being provided with. (7) Water to be electrolyzed, which is a mixture of an aqueous sodium chloride solution and raw water supplied from the raw water introduction pipe, is supplied to an electrolytic cell having an anode chamber and a cathode chamber for electrolysis, and then taken out from the anode chamber. A method for producing sterilized water, characterized in that the produced water is mixed and diluted with raw water supplied from a dilution raw water conduit branched midway through the raw water introduction pipe. (8) In the method for producing sterilized water according to claim 7, instead of mixing and diluting with the raw water supplied from the dilution raw water conduit, raw water supplied from the dilution raw water conduit and generated water taken out from the cathode chamber A method for producing sterilizing water having a configuration of mixing and diluting with water. (9) In the method for producing sterilized water according to claim 7, the sterilized water has a configuration in which the sterilized water is mixed and diluted with produced water taken out from the cathode chamber, instead of being mixed and diluted with raw water supplied from the dilution raw water conduit. manufacturing method.