JPH11290856A - Apparatus for producing sterilized washing water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the production efficiency of hypohalognous acids and to use stably over a long period by a method in which water containing halogen ions is electrolyzed, and in an apparatus for producing sterilized washing water containing hypohalogenous acids, a ferrite electrode is used as an anode plate. SOLUTION: City water containing halogen ions, after being stored primarily, is supplied to an electrolysis apparatus 1 by a pump to be electrolyzed, and refluxed treated water is stored primarily in a storage tank 2. In the apparatus 1, an electrolytic passage is formed between an anode plate and a cathode plate, the anode plate is made of ferrite, and a titanium plate is used as the cathode plate. A control part 4 set up the amperage stored in a control program in advance in a constant current power source 3, which changes voltage and supplies power to the apparatus 1 while controlling the amperage to flow between the electrode plates, the water is electrolyzed, and hypochlorous acid is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing sterilizing cleaning water capable of generating sterilizing cleaning water containing hypohalous acid having sterilizing ability by electrolyzing water containing halogen ions. About.

[0002]

2. Description of the Related Art Conventionally, electrolysis is performed by passing fresh water containing halide ions or service water added with a halide through an electrolytic passage in which an anode plate and a cathode plate are arranged at a predetermined interval.
Japanese Patent Application Laid-Open No. Hei 6-1994 discloses a disinfecting cleaning water generating apparatus that generates hypohalous acid having disinfecting ability and turns it into disinfecting washing water.
As shown in Japanese Patent No. 292892 and Japanese Patent Publication No. 4-28438, a titanium electrode coated with platinum or a white metal element oxide is used as an anode, and this anode and a cathode plate made of iron, stainless steel, titanium or platinum-coated titanium are used. Are arranged at predetermined intervals, and water is circulated during the separation to perform electrolysis.

[0003]

However, when a titanium electrode coated with these platinum or white metal element oxides is used, an expensive platinum or white metal element oxide is used, so that the anode plate is extremely remarkable. In addition to the high efficiency, the hypohalous acid generation efficiency in the electrolysis is low, and a large amount of current must be supplied between the electrode plates. In the case of widening or directly electrolyzing fresh water such as tap water having low electric conductivity, the voltage applied between the electrode plates becomes large. There was a problem that the coating of the material was peeled off, the titanium electrode was exposed, the predetermined electrolysis could not be performed, and the production efficiency was significantly reduced.

Accordingly, the present invention has been made in view of the above problems, and has a high hypohalous acid generation efficiency.
It is an object of the present invention to provide an inexpensive apparatus for producing sterilized cleaning water that can be used stably for a long period of time and that is inexpensive.

[0005]

In order to solve the above-mentioned problems, an apparatus for producing sterilizing washing water according to the present invention is characterized in that water containing at least halogen ions is supplied at a predetermined interval between an anode plate and a cathode plate. A generator for generating sterilizing washing water containing hypohalous acid by passing water through the electrolysis passage, wherein at least the anode plate is a ferrite electrode. According to this feature, when the anode plate is made of ferrite, a high generation efficiency of hypohalous acid is obtained, and when electrolysis is performed by passing water between the anode plate and the cathode plate,
Due to the short time that the water stays between the anode plate and the cathode plate, a large current is required to generate the desired concentration of hypohalous acid,
A voltage is required, and the ferrite does not deteriorate even at these large currents and voltages, and not only can the production efficiency be maintained stably for a long period of time, but also because the production efficiency of hypohalous acid is high, the electrolytic passage In this case, the flow rate of the service water can be increased to increase the throughput, and the price can be reduced.

[0006] In the apparatus for producing sterilized washing water according to the present invention, the service water is fresh water such as tap water having a salt concentration of at least 5 ppm, and an interval between the anode plate and the cathode plate is 2 to 6;
mm. If you do this,
Since the ferrite electrode, which is the anode plate, has sufficient durability even when a high voltage of 10 volts or more is applied, fresh water such as tap water containing a small amount of salt is directly electrolyzed without adding an electrolyte. It is possible to produce sterilizing washing water at a low cost and to set the distance between the electrode plates to 2 to 6 m.
By increasing the width to m, not only high processing capacity can be obtained, but also calcium and magnesium contained in fresh water such as tap water can be precipitated and adhered as hydroxide on the cathode and short-circuited between the electrode plates. As long as it can be prevented.

[0007] The apparatus for generating sterilized washing water of the present invention detects a constant current power supply having a predetermined current value between the anode plate and the cathode plate and a voltage between the anode plate and the cathode plate. Voltage detecting means, based on the voltage detected by the voltage detecting means, to detect the electric conductivity of the supplied water, and when the supplied water has a low electric conductivity, the electric current value is calculated. It is preferable to provide a control means for controlling the pressure to be raised. In this case, when the supplied water, particularly the used water is fresh water such as tap water, the electric conductivity is not constant, and the electric conductivity changes in a season, time, and the like. When the electric conductivity decreases, a predetermined hypohalous acid concentration having a sufficient sterilizing ability may not be obtained even when a predetermined current is applied, so that the electric conductivity of the supplied fresh water is low. By increasing the predetermined current value to be energized, it is possible to stably obtain germicidal washing water having a desired hypohalous acid concentration.

[0008] The apparatus for producing sterilized washing water of the present invention is provided with a residual halogen concentration detecting means for detecting a residual halogen concentration downstream of the electrolysis passage, and the residual halogen concentration detected by the residual halogen concentration detecting means. When is less than or equal to a predetermined value, it is preferable that control means is provided for increasing the amount of current flowing between the anode plate and the cathode plate and / or decreasing the flow rate of the electrolytic passage. In this way, in the case of supplied water, particularly fresh water such as tap water, since the service water contains an electrolyte other than salt, a desired hypohalous acid can be obtained even when a predetermined current is applied. Therefore, the concentration of hypohalous acid generated by the electrolysis is detected by the residual halogen concentration detecting means, and when the detected concentration of hypohalous acid is lower than a predetermined value, the electric current is not supplied. By increasing the flow rate or decreasing the flow rate in the electrolytic passage, it is possible to stably obtain sterilizing washing water having a desired hypohalous acid concentration.

[0009] The apparatus for producing sterilized washing water of the present invention comprises: a storage tank for temporarily storing service water supplied to the electrolytic passage;
Circulating means for returning the water electrolyzed in the electrolysis passage to the storage tank again, and residual halogen concentration detecting means for detecting hypohalous acid concentration at a predetermined position in the water flow path, When the hypohalous acid concentration detected by the means reaches a predetermined concentration, it is preferable that the sterilizing washing water be supplied to the outside or stored in a supply tank. In this manner, the sterilizing water supplied to the outside or stored in the supply tank always has a predetermined hypohalous acid concentration, thereby preventing the sterilizing water from having an insufficient sterilizing ability. can do.

[0010] In the apparatus for producing sterilizing washing water of the present invention, it is preferable that the storage tank and / or the supply tank are light-shielded so that light does not enter. This can prevent the hypohalous acid contained in the service water stored in each tank from being decomposed by light.

In the apparatus for producing sterilized washing water according to the present invention, a method for joining an electrode terminal and a ferrite electrode derived from the ferrite electrode is such that a hole is provided at a predetermined position of the ferrite electrode and inserted into the hole. It is preferable that the gap with the electrode terminal tip is filled with a conductive metal coupling member that is deformed by insertion of the electrode terminal, and is joined and integrated. By doing so, the ferrite electrode, which is poor in workability and difficult to perform screw processing, etc., and the electrode terminal are connected and integrated with low resistance, and water can enter the joint. Therefore, a high voltage can be stably applied over a long period of time.

[0012] It is preferable that the apparatus for producing sterilizing washing water of the present invention is provided with a plurality of electrode terminals led out from the ferrite electrode. In this way, by connecting the ferrite electrodes with a plurality of electrode terminals, the load on the electrode terminals and the connection between the electrode terminals and the ferrite electrode can be reduced, and a high voltage can be stably applied for a long period of time. can do.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system flow diagram showing a device for producing sterilized cleaning water of the present embodiment, and FIG. 2 shows a structure of an electrolytic reaction device used for the device for generating sterilized cleaning water of the present embodiment. It is a partially broken exploded perspective view, and FIG. 3 (a) and (b)
FIG. 4 is a side sectional view showing a connection portion between a ferrite electrode and an electrode terminal used in the electrolytic reaction device of the present embodiment and a connection method thereof, and FIG. FIG. 5 is a side sectional view showing the residual halogen concentration detection device, and FIG. 5 is a graph showing the relationship between the voltage and the concentrations of hypochlorous acid and hypobromite in the residual halogen concentration detection device.

In FIG. 1, LS is a level sensor for measuring a water level, FM is a flow meter, P is a pump, and V is an electromagnetic valve.

FIG. 1 is a schematic diagram showing an apparatus for generating sterilized cleaning water according to the present embodiment.
The primary storage of tap water as tap water and supply of tap water to the electrolysis apparatus 1 by a pump, and treatment of the electrolyzed and refluxed treated water by the electrolysis apparatus 1 into the primary water A storage tank 2 for storing, a circulating pump P disposed in a water flow path from the storage tank 2 to the electrolysis device 1 and capable of changing a flow rate according to an instruction from the control unit 4; a flow meter FM; Residual halogen that is disposed in a form branched from a water flow path connected to the device 1 and a downstream portion of the electrolytic device 1, and detects residual halogen concentration of the water supplied to the electrolytic device 1 and the water electrolyzed by the electrolytic device 1. Concentration detectors 5 and 5 'and the circulation pump P
Electrolysis apparatus 1 that electrolyzes service water or circulating water supplied from storage tank 2 to produce hypohalous acid such as hypochlorous acid or hypobromite, and electrolysis apparatus 1
Constant current power supply 3 for supplying a current set to a predetermined value to
A control unit 4 which is connected to the circulating pump P, the flow meter FM, the residual halogen concentration detecting device 5, the constant current power supply 3 and the like, and which controls the respective units, and the like; and a predetermined hypohalous acid And a supply tank 6 for temporarily storing the concentrated water, and a downstream part of the electrolysis apparatus 1 includes a reflux path leading to the storage tank 2 and a supply path leading to the supply tank 6. Branches are provided, and electromagnetic valves V2 and V3 are arranged in individual flow paths, and the control unit 4 opens and closes these valves to circulate water or transfer the water to a supply tank. .

The electrolysis apparatus 1 of this embodiment has a structure as shown in FIG. 2, and an electrolysis passage 13 for performing electrolysis is formed between an anode plate 11 and a cathode plate 14. It has become.

The anode plate 11 of this embodiment is made of ferrite, and a titanium plate is used for the cathode plate 14. Each of these electrode plates has a predetermined gap, which is about 5 mm in this embodiment. It is fitted and arranged in a case 15 made of vinyl chloride.

As described above, it is preferable that the distance between the anode plate 11 and the cathode plate 14 is large from the viewpoint of processing capacity. However, when the distance is large, the electric conductivity of fresh water such as tap water to be electrolytically treated becomes large. Since the voltage is low, the voltage applied between the electrode plates becomes extremely high, and a constant current power supply capable of applying these high voltages becomes expensive.
If the particle size is small, the processing capacity of the electrolytic device is reduced, and a problem caused by salts deposited and adhered to the cathode is apt to occur.

The ferrite electrode used as the anode in the present embodiment is excellent in specific resistance, corrosion resistance, impact strength and the like, and thus, a divalent metal compound such as nickel oxide and ferric oxide is used in a predetermined manner. It is preferable to obtain a nickel unitary ferrite obtained by calcining the mixture in the appropriate ratio under a suitable atmosphere condition. In this embodiment, the nickel unitary ferrite (manufactured by TDK) is used. Two electrode terminals 19 made of titanium are formed at predetermined positions on the upper surface of the anode plate 11 made of unitary ferrite.

As described above, forming a plurality of electrode terminals 19 reduces the load on the electrode terminals 19 and their joints because a high voltage is applied to each electrode plate as in this embodiment. Therefore, the number may be further increased.

The opening at the end of the housing 15 is
6 is closed by fixing a cover member 17 made of vinyl chloride with a countersunk screw 18, and the anode plate 11 and the cathode plate 14 pass through the cover member 17 to the outside of the housing 15. An exposed electrode terminal 19 (only one of the cathode plates 14 is shown, the other electrode is not shown) is provided. The electrode terminal 19 is provided on the lid 17 by an O-ring 20, a round washer 21, and a stainless steel nut 22. The electrode terminal 19 is provided with a titanium nut 10 that covers a connection portion with each of the electrodes. A DC current having a predetermined current value is supplied from the constant current power supply 3 to the electrode terminal 19. At both ends, an inlet joint 12 and an outlet joint 23 to the electrolysis passage 13 are provided, so that water can be supplied from below the electrolysis apparatus 1.

Since the ferrite electrode 11 of this embodiment is a fired product obtained by firing as described above, it has hard brittleness and is liable to chip or break during processing. In this embodiment, the electrode terminal 19 is formed on the ferrite electrode 11 by a method as shown in FIG.

The electrode terminals 19 are connected to the ferrite electrode 11
Is formed at a predetermined position on the ferrite electrode 11,
A hole 25 is provided, and a lead connection plug 26 made of lead as a metal connection member is arranged inside the hole 25 as shown in FIG. 3A. The diameter of the space inside the connection plug 16 is The upper end opening is slightly larger than the outer shape of the electrode terminal 9 to be inserted.
The upper end is tapered toward the upper opening so as to be slightly smaller than the outer shape of the cylinder, and has a cylindrical shape with three opening grooves 26 on the side of the cylinder. It is provided at intervals.

The electrode terminal 19 has the hole 2
After the titanium nut 10 for covering the opening of the hole 5 is disposed, the electrode terminal 19 is inserted into the hole 25, and after the integration, the periphery of the opening of the hole 25 is It is made to cover.

FIG. 3 (a)
As shown in FIG. 2, the hole 2 in which the coupling plug 26 is disposed
5, the coupling plug 16 is made of lead, has a Mohs hardness of 1.5, and is lower than the Mohs hardness of 4 or more of the anode plate 11 made of ferrite and the electrode terminal 19 made of titanium. Therefore, the coupling plug 26 is deformed and penetrates into the screw groove of the electrode terminal 19,
Filling the gap between the electrode terminal 19 and the hole 25, the electrode terminal 1
9 and ferrite anode plate 11 conduct with low resistance,
It is integrated.

The material of these coupling plugs 26 is not limited to the above-mentioned lead, but is a metal having high electric conductivity, being softer than ferrite, titanium, etc., and more extensible. Any material may be used as long as it is not easily corroded by hypohalous acid generated in the above. Examples of these materials include tin, copper, zinc, bismuth,
Cadmium, gallium, indium, silver, palladium, platinum, gold and the like are exemplified.

By joining the electrode terminals 19 in this way, the anode plate 11 made of ferrite, which is poor in workability, can be connected to the electrode terminals 19 with a low resistance, and even if a high voltage is applied, it deteriorates due to heat generation and the like. Further, by covering the opening of the hole 25 with the titanium nut 10 as described above, it is possible to prevent electrolytic water or the like from entering the joint to cause corrosion. This is preferred.

In this embodiment, these electrode terminals 19 are used.
The constant current power supply 3 is connected to the power supply 3. The constant current power supply 3 appropriately changes the voltage so that a predetermined current flows between the electrode plates. As shown in FIG. 1, a voltmeter and an ammeter are disposed between the control unit 4 and the control unit 4. The control unit 4 detects a voltage and a current applied to the electrolysis apparatus 1 as needed. I can do it.

In this embodiment, as described above, two residual halogen concentration detectors 5 and 5 'are provided in the water flow path leading to the electrolytic device 1 and the downstream portion of the electrolytic device 1. The residual halogen concentration detectors 5 and 5 'of the embodiment
A cylindrical case 28 mainly having a metal catalyst 35 therein for decomposing hypohalous acid therein and a cross port 29 provided so as to be exposed in the water to be measured are provided as shown in FIG. Measuring electrode 31 and the cylindrical case 28
The measurement electrode 31 and the reference electrode 33 are connected to a voltmeter 35 via cables 32 and 34, and are connected to a voltmeter 35 in FIG.
0 is an air release valve.

The principle of detecting the residual halogen concentration by the residual halogen concentration detecting devices 5 and 5 'will be briefly described.
First, the space inside the cylindrical case 28 is filled with water containing hypohalous acid such as hypochlorous acid.

The hypohalous acid in these service waters is almost completely decomposed by the metal catalyst 35 and the cylindrical case 28
The inside is filled with water containing almost no hypohalous acid.

Here, the water containing hypohalous acid flows through the cross hole 29 as shown by the solid arrow, and the measuring electrode 31 exposed in the flow path and the water exposed to the water free of hypohalous acid. A small voltage is generated between the reference electrode and the reference voltage, and the voltage and the concentration of hypohalous acid have a relationship as shown in FIG. The voltage data measured by the minute voltmeter 36 is output to the control unit 4, and the control unit 4 measures the residual water concentration. The halogen concentration can be detected at any time.

Further, as shown in FIG. 1, the storage tank 2 and the supply tank 6 of the present embodiment are shielded from light by external housings 8 and 9 which shield the outside.
Reference numeral 7 in the figure denotes vents for introducing and discharging air into the inside of the tank. Light is prevented from entering the inside of the tank also from the vents 7.

As described above, by shielding the tank from light,
It is possible to prevent the hypohalous acid contained in the service water and the sterilizing washing water stored in each tank from being decomposed by light, and when using fresh water as in the present invention, the amount of hypohalous acid generated Is less than the method of electrolysis by adding an electrolyte or the like to the water, and its production efficiency is low. Therefore, preventing hypohalous acid generated once from being decomposed is an aspect of the efficiency of the device itself. Is also important.

A control program for controlling the operation of each unit is stored in the control unit 4 in advance. Based on this control program, the value of the current supplied between the electrode plates, The flow rate by the pump P, the transfer to the supply tank 6, and the like are determined.

The operation of the apparatus for producing sterilized washing water according to the present embodiment will be described below. First, the electromagnetic valve 4 is opened by the control unit 4, and tap water as tap water is injected into the storage tank 2, and a predetermined amount of water is supplied. Is detected by the level sensor LS, the electromagnetic valve 4 is closed, and a certain amount of clean water is stored in the storage tank 2.
Is stored.

Next, the electromagnetic valve 1 is opened, and the water in the storage tank 2 is supplied to the electrolysis device 1 by the pump P.

The control section 4 sets a predetermined current value described in a control program in advance in the constant current power supply 3, and the constant current power supply 3 varies the voltage so that the current value is set between the electrode plates. Electric power is supplied to the electrolysis apparatus 1 while controlling it to flow, and the water is electrolyzed to generate hypochlorous acid or, if a trace amount of bromine is contained in the tap water, hypobromous acid.

The water in which the hypohalous acid such as hypochlorous acid or hypobromite is generated is discharged from the electrolysis apparatus 1 and supplied to the supply tank 6 or the sterilized cleaning water generated. When it is desired to increase the concentration of hypohalous acid, the service water discharged from the electrolysis device 1 is circulated by opening the electromagnetic valve V3 and returning to the storage tank 2 via the return path. .

In the electrolysis of the electrolysis apparatus 1, the electric conductivity of the water supplied to the electrolysis apparatus 1 is such that when the electric conductivity of the water decreases or increases, the voltage generated between the electrode plates increases or decreases. Therefore, it can be detected at any time by detecting the voltage generated between the electrode plates by the voltmeter V, and the electric conductivity of the water greatly decreases and the voltage of the voltmeter V becomes a predetermined voltage. When the voltage rises above the voltage, the control unit 4 changes the predetermined current value set in the constant current power supply 3 to a larger current value.

When the electric conductivity of these waters is significantly reduced, the desired hypohalous acid concentration may not be obtained even if a predetermined current is applied. By controlling with a larger current value, a decrease in the concentration of hypohalous acid is suppressed as much as possible,
This is preferable because stable generation of hypohalous acid can be performed.

In this embodiment, as described above, the control unit 4 is connected to the residual halogen concentration detecting device 5 'so that the control unit 4 can detect the residual halogen concentration in the water generated in the electrolytic device 1 as needed. When the residual halogen concentration of the service water detected at any time is lower than a predetermined concentration, the control unit 4 includes an electrolyte other than the salt in the tap water supplied from the storage tank. It is determined that halogenous acid is not produced. In this case, the set current value of the constant current power supply 3 is increased. Control is performed such that the rotation of P is reduced to reduce the circulation amount of the water to generate a predetermined amount of hypohalous acid.

In this manner, when the tap water supplied to the electrolysis apparatus 1 contains an electrolyte other than salt, a predetermined hypohalous acid is not generated, and the predetermined hypohalous acid concentration is reduced. This is preferable because it is possible to prevent the supply of sterilized cleaning water having a low concentration.

When it is desired to obtain sterilizing washing water having a high hypochlorous acid concentration and a high sterilizing power, these waters are circulated through a reflux path and passed through the electrolyzer 1 a plurality of times. It can be obtained by performing an electrolytic treatment.

The water circulated in this manner is assumed to have a successively higher hypohalous acid concentration, and the hypohalous acid concentration detected by the residual halogen concentration detector 5 is set in advance. When a predetermined supply concentration is reached, the control unit 4 opens the electromagnetic valve V2, closes the electromagnetic valve V3 to stop the reflux, transfers the service water to the supply tank 6 as sterilizing washing water, and stores it.

In this manner, the supply tank 6 always stores and supplies the sterilizing washing water having a sufficient concentration of hypohalous acid and having a sufficient sterilizing ability and having a predetermined concentration of hypohalous acid. Sterilization cleaning can be performed.

Hereinafter, a specific operation example using the apparatus for producing sterilized cleaning water of the present embodiment will be described.

(Operation Example 1) Electric conductivity 193 as tap water
μs / cm, pH 7.2, tap water having a salt concentration of 43 ppm and a hypohalous acid concentration of 0.2 ppm, and an electrolytic device 1 having an electrode having an electrode area of 2 deci square meters And the set flow rate of the water used was 100 ml / min, and the capacity was 300 W as the constant current power supply 3.
Is supplied to the supply tank 6 from the solenoid valve V2 without circulating the water,
The results of measuring the voltage at each set current value of A and the concentration of hypochlorous acid obtained in the sterilized cleaning water obtained are shown below.

[Table 1]

From the sterilized washing water thus obtained,
Hypochlorous acid concentration obtained at a set current of 1 A 4.8 ppm
Germicidal washing water, and each germicidal washing water having a hypochlorous acid concentration of about 0.5 ppm and about 1 ppm generated under other conditions,
The results of conducting a bactericidal test when the bacteria were brought into contact with various bacteria for a predetermined time are shown below.

[Table 2]

From these results, it was found that the sterilizing ability at a contact time of 1 minute shows good sterilizing ability against various bacteria when the hypochlorous acid concentration is about 1 ppm.
The germicidal washing water having a hypochlorous acid concentration of 4.8 ppm obtained in A is found to have a very high germicidal ability, and the germicidal washing water having such a high germicidal ability is used by the production apparatus of the present invention. Thus, it can be seen that it can be produced from tap water having a salt concentration of 43 ppm.

(Operation Example 2) In Operation Example 1, when the electromagnetic valve V2 is closed and the electromagnetic valve V3 is opened to circulate the water, the circulation time at each set voltage and the concentration of hypochlorous acid in the water are determined. The measurement results are shown below.

[Table 3]

From this result, by circulating, a germicidal washing water having a high hypochlorous acid concentration can be obtained. It can be seen that sterilized cleaning water having a concentration can be generated.

(Operation Example 3) In the electrolysis apparatus 1 of the above embodiment, the anode plate 11 was a conventional platinum-coated titanium electrode, and the electrolysis apparatus 1 using ferrite of the above embodiment was used.
A comparison of hypochlorous acid production and durability was performed.

The operating conditions were the same as those in the operation example 1 except that the production of hypochlorous acid was compared with that of the operation example 1.
As a result of using tap water having a hypohalous acid concentration of 0.2 ppm, when the ferrite electrode of the above example was used, the voltage between the electrode plates was about 34 V, and the generated hypochlorous acid was used. Concentration was about 27 ppm and good production was achieved, whereas the one using a conventional platinum-coated electrode
Even if the set current value is 3 A, the voltage between the electrode plates is about 50
V or more, a predetermined current could not be passed, and the concentration of the generated hypochlorous acid was about 5 ppm, and no good generation was performed.

Further, as described in the operation example 2 above, the tap water is used, the set current value is set to 3 A, and the service water is circulated. The results of observing the condition of the electrode plate at that time by performing the long-term operation by changing the water at any time are shown below.

[Table 4]

From this result, in the conventional platinum-coated titanium electrode, the voltage applied between the electrode plates gradually increased,
In about 100 cycles, the specified current cannot be supplied,
The generated hypochlorous acid can hardly be obtained,
At this stage, the platinum coating was peeled off and titanium was exposed, whereas the anode plate using the ferrite electrode of the present invention did not show any abnormality even after 500 cycles, 27,5p even at 500 cycles
pm and good hypochlorous acid were produced.

Comparative Example In the operation example 1, salt was added to tap water used for electrolysis, the electric conductivity was adjusted to 500 μs / cm, the pH was adjusted to 7, and the flow rate was adjusted to 10
A conventional platinum-plated titanium electrode plate, a graphite electrode plate, and a titanium plate were used as the anode plate instead of the ferrite of the above-described embodiment, with 0 milliliter / minute and the distance between the electrode plates being a maximum of 6 mm. FIG. 6 shows the results of comparing the production of hypochlorous acid at each set current value with the area of Torr.

In this comparative example, since the electric conductivity of the water used for the electrolysis is constant, almost the same voltage is generated when the same current is applied between the electrode plates, Since the applied power increases in proportion to the current, in FIG. 6, it can be determined that the electrode capable of obtaining a high hypochlorous acid concentration with a small current value has a high hypochlorous acid generation efficiency. Efficiency is highest for the ferrite of the present invention, followed by graphite, platinum-plated titanium electrode, and titanium in this order.Compared to the conventional platinum-plated titanium electrode, the generation efficiency of the ferrite electrode of the present invention is significantly higher. From this, it can be seen that hypochlorous acid can be produced even using fresh water having a low chloride ion concentration.

Although the present invention has been described with reference to the drawings, the present invention is not limited to the above embodiment.
It goes without saying that changes and additions without departing from the gist of the present invention are included in the present invention.

In the above embodiment, tap water is used. However, the present invention is not limited to this, and even if it is well water or purified effluent from a water purification plant, predetermined salt water is used. Any freshwater having a concentration may be used.

Further, in the above embodiment, the water used for the electrolysis is fresh water. However, the present invention is not limited to this, and as in the comparative example, the water used is salt or sodium bromide. And the like, may be added as appropriate to increase the electric conductivity to carry out the electrolysis.

In this embodiment, the two residual halogen concentration detectors 5 and 5 'are provided upstream and downstream of the electrolyzer. However, the present invention is not limited to this. These residual halogen concentration detection devices may be provided in an appropriate number at appropriate positions in the flow path.

[0064]

The present invention has the following effects.

(A) According to the first aspect of the present invention, since the anode plate is made of ferrite, a high hypohalous acid generation efficiency is obtained, and water is passed between the anode plate and the cathode plate. When the electrolysis is carried out, since the water stays between the anode plate and the cathode plate for a short time, a large current and a large voltage are required to generate the desired concentration of hypohalous acid. The ferrite is not deteriorated even at the voltage, and the production efficiency can be maintained stably for a long period of time, and since the production efficiency of hypohalous acid is high, the flow rate of the water in the electrolytic passage is increased to treat The amount can be increased and the price is lower.

(B) According to the second aspect of the present invention, since the ferrite electrode as the anode plate has sufficient durability even when a high voltage of 10 V or more is applied, it contains a small amount of salt. Fresh water such as tap water can be directly electrolyzed without adding an electrolyte, and sterile cleaning water can be produced at low cost. By increasing the distance between the electrode plates to 2 to 6 mm, high processing capacity can be obtained. In addition to being obtained, calcium and magnesium contained in fresh water such as tap water can be prevented as much as possible from being precipitated and adhered as hydroxide on the cathode and short-circuiting between the electrode plates.

(C) According to the third aspect of the present invention, when the supplied water, especially the supplied water is fresh water such as tap water,
Since the electric conductivity is not constant and changes in the season and time, etc., when the electric conductivity decreases, a predetermined sub-substance having a sufficient sterilizing ability even when a predetermined current is applied. Since the halogen acid concentration may not be obtained, when the electric conductivity of the supplied fresh water is low, by increasing the predetermined current value to be energized, the sterilizing washing water having the desired hypohalous acid concentration can be obtained. It can be obtained stably.

(D) According to the invention of claim 4, in the case of supplied water, especially in the case of fresh water such as tap water, an electrolyte other than salt is contained in the supplied water. Even if the desired hypohalous acid may not be obtained, the concentration of hypohalous acid generated by electrolysis is detected by the residual halogen concentration detecting means, and the detected hypohalous acid concentration is reduced. When the value is lower than the predetermined value, a sterilizing cleaning water having a desired hypohalous acid concentration can be stably obtained by increasing the amount of the supplied current or decreasing the flow rate of the electrolytic passage.

(E) According to the fifth aspect of the present invention, the sterilizing cleaning water supplied to the outside or stored in the supply tank always has a predetermined hypohalous acid concentration. Insufficient sterilization ability can be prevented.

(F) According to the invention of claim 6, it is possible to prevent the hypohalous acid in the water stored in each tank from being decomposed by light.

(G) According to the seventh aspect of the present invention, the ferrite electrode, which has poor workability and is difficult to perform screw processing, etc., and the electrode terminal are connected and integrated with low resistance. In addition, high water can be stably applied for a long period of time without water entering the joint.

(H) According to the invention of claim 8, by connecting the ferrite electrode with the plurality of electrode terminals, the load on the electrode terminal and the connection between the electrode terminal and the ferrite electrode can be reduced, and Voltage can be stably applied over a long period of time.

[0073]

[Brief description of the drawings]

FIG. 1 is a system flow diagram showing an apparatus for generating sterilized cleaning water according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a part of the structure of an electrolytic reaction apparatus used in the apparatus for generating sterilized cleaning water according to the embodiment of the present invention.

FIGS. 3 (a) and 3 (b) are side sectional views showing a connection portion between a ferrite electrode and an electrode terminal used in the electrolytic reaction device according to the embodiment of the present invention, and a connection method thereof.

FIG. 4 is a side sectional view showing a residual halogen concentration detection device used in the device for generating sterilized cleaning water according to the embodiment of the present invention.

FIG. 5 is a graph showing the relationship between the voltage and the concentrations of hypochlorous acid and hypobromite in the residual halogen concentration detection device used in the example of the present invention.

FIG. 6 is a graph showing a relationship between each current value of each anode plate and generated hypochlorous acid in a comparative example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electrolysis apparatus 2 Storage tank 3 Constant current power supply 4 Control part 5 Residual halogen concentration detection apparatus (residual halogen concentration detection means) 6 Supply tank 7 Vent 8 External housing 9 External housing 10 Titanium nut 11 Anode plate 12 Water supply part 13 Electrolysis Passage 14 Cathode plate 15 Housing 16 Packing 17 Lid 18 Countersunk screw 19 Electrode terminal 20 O-ring 21 Round washer 22 Titanium nut 23 Joint 25 Hole 26 Coupling plug 27 Split groove 28 Cylindrical case 29 Cross vent 30 Air vent valve 31 measuring electrode 32 cable 33 reference electrode 34 cable 35 metal catalyst 36 micro voltmeter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 1/50 560 C02F 1/50 560F

Claims (8)

[Claims] 1. An electrolysis system in which water containing at least halogen ions is passed at a predetermined speed through an electrolytic passage in which an anode plate and a cathode plate are arranged at a predetermined interval to contain hypohalous acid. A generator for generating sterilizing cleaning water, wherein at least the anode plate is a ferrite electrode. 2. The germicidal washing according to claim 1, wherein the service water is fresh water such as tap water having a salt concentration of at least 5 ppm, and a distance between the anode plate and the cathode plate is 2 to 6 mm. Water generator. 3. A power supply comprising: a constant current power supply having a predetermined current value for a current flowing between the anode plate and the cathode plate; and voltage detection means for detecting a voltage between the anode plate and the cathode plate. Based on the voltage detected by the voltage detecting means, the control means for detecting the electrical transmission of the supplied water, and controlling to increase the current value when the electrical transmission of the supplied water is low. 3. The apparatus for producing sterilized washing water according to claim 1 or 2, wherein the apparatus is used. 4. A residual halogen concentration detecting means for detecting a residual halogen concentration in a downstream portion of the electrolytic passage, wherein the residual halogen concentration detected by the residual halogen concentration detecting means is not more than a predetermined value. 4. The apparatus for producing sterilized cleaning water according to claim 1, further comprising control means for increasing an amount of current flowing between the anode plate and the cathode plate and / or decreasing a flow rate of the electrolytic passage. 5. A storage tank for temporarily storing the water supplied to the electrolysis passage, a circulating means for returning the water electrolyzed in the electrolysis passage to the storage tank again, and a predetermined position in the water flow passage. And a residual halogen concentration detecting means for detecting the concentration of hypohalous acid, and when the concentration of hypohalous acid detected by the detecting means reaches a predetermined concentration, sterilizing washing water is supplied to the outside. The apparatus for producing sterilized cleaning water according to any one of claims 1 to 4, wherein the apparatus is stored in a supply tank. 6. The storage tank and / or the supply tank are light-shielded so that light does not enter the storage tank and / or the supply tank.
An apparatus for producing sterilizing washing water according to item 1. 7. A method of joining an electrode terminal and a ferrite electrode derived from the ferrite electrode, wherein a hole is provided at a predetermined position of the ferrite electrode, and a gap between the electrode terminal tip inserted into the hole is provided. The apparatus for producing sterilized cleaning water according to any one of claims 1 to 6, wherein the apparatus is filled with a conductive metal bonding member that is deformed by insertion of the electrode terminal, joined, and integrated. 8. The apparatus for producing sterilizing wash water according to claim 1, wherein a plurality of electrode terminals led out from said ferrite electrode are provided.