JP6896259B1 - Sterilization wash water production equipment and sterilization wash water production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a sterilizing washing water manufacturing apparatus and a sterilizing washing water manufacturing method which can obtain a high concentration sterilizing washing water regardless of the water quality of raw water without adding a chloride ion source. SOLUTION: An ion exchange unit 3 having a chlorine-type anion exchange resin and configured so that the water and the chlorine-type anion exchange resin come into contact with each other when water is circulated, and an ion exchange unit 3. It is provided with an electrolysis unit 5 capable of electrolyzing the circulated water. [Selection diagram] Fig. 1

Description

The present invention relates to a sterilizing washing water manufacturing apparatus and a sterilizing washing water manufacturing method.

Since sterilizing and washing water with a residual chlorine concentration of ₂ mgCl 2 / L or more has a high sterilizing effect, sterilizing and cleaning of piping inside equipment such as drinking water supply equipment, hand washing equipment, and hot bath equipment as a preventive cleaning liquid for biofilms. Widely used in. As the sterilizing and cleaning water for this purpose, a sterilizing and cleaning solution in which the pH of the diluted solution of the sodium hypochlorite aqueous solution is usually adjusted has been used, but it is troublesome to prepare the diluted solution of the sodium hypochlorite aqueous solution each time the sterilizing and cleaning is performed. Was required. As one of the devices that eliminates this trouble, an electrolysis device that electrolyzes water containing chloride ions to obtain sterilizing washing water containing hypochlorous acid is known.

The chemical reaction according to the method for obtaining sterilizing washing water containing hypochlorous acid by electrolysis is as follows. First, when water containing chloride ions is electrolyzed, chlorine (Cl ₂ ^{) is generated from chloride ions (Cl −} ) in the water at the anode (Equation (1)). Chlorine generated by the reaction of formula (1) immediately reacts with water to produce hydrogen chloride and hypochlorous acid (formula (2)).
2Cl ⁻ → Cl ₂ + 2e ⁻ (1)
Cl ₂ + H ₂ O → HCl + HClO (2)

As described above, the reaction for obtaining sterilizing washing water containing hypochlorous acid by electrolysis uses chloride ions in water as a starting material. As the raw water containing such chloride ions, tap water used in the apparatus of JP-A-2018-47059 (Patent Document 1) and the apparatus of JP-A-2018-103167 (Patent Document 2) are used. Examples thereof include hydrochloric acid, an aqueous solution of potassium chloride, and an aqueous solution of sodium chloride.

JP-A-2018-47059 JP-A-2018-103167

When tap water is used directly, it may be difficult to obtain sterilizing wash water with a high concentration of _{residual chlorine exceeding 2 mgCl 2 / L from public tap water.} For example, in Japan, the Waterworks Law and the Enforcement Regulations of the Waterworks Law _{stipulate that chlorine disinfection should be performed so that the free residual chlorine concentration remains 0.1 mgCl 2} / L or more, but on the other hand, the Ministry of Health, Labor and Welfare As a water quality management target setting item in the tap water quality standard set by the above, the target value of the residual chlorine concentration is 1.0 mgCl ₂ / L or less.

Further, when trying to increase the residual chlorine concentration by electrolysis using tap water as in Patent Document 1, there is a problem that the chloride ion concentration in tap water differs depending on the conditions such as the region. For example, in Japan, the chloride ion concentration in tap water ranges from several mg / L to 100 mg / L, but according to the 2013 water supply statistics data, 27% is 5 mg / L or less, and 34 is 5 to 10 mg / L. %, That is, the chloride ion concentration is 10 mg / L or less in about 60% of tap water in Japan. Even if tap water having such a chloride ion concentration is subjected to electrolysis, only the residual chlorine concentration (0.1 mgCl ₂ / L or more and 1.0 mgCl ₂ / L or less) equivalent to that of the above-mentioned general tap water can be obtained. However, although it could be sterilized water for preventing bacterial contamination as tap water, it could not be used as sterilized washing water.

On the other hand, in the method using a chloride ion source such as hydrochloric acid as in the apparatus of Patent Document 2, it is necessary to add a substance serving as a chloride ion source to the raw water each time the sterilizing washing water is produced. Therefore, the work for producing the sterilizing washing water is complicated.

Therefore, it is required to realize a sterilizing washing water production device and a sterilizing washing water manufacturing method that do not require the addition of a chloride ion source such as hydrochloric acid and can obtain a high concentration of sterilizing washing water regardless of the quality of the raw water. Was there.

The sterilizing and washing water production apparatus according to the present invention has a chlorine-type anion exchange resin, and is an ion exchange unit configured so that the water and the chlorine-type anion exchange resin come into contact with each other when water is circulated. It is characterized by including an electrolyzer that can electrolyze the water that has passed through the ion exchange unit.

Further, the method for producing sterilizing and washing water according to the present invention includes an ion exchange step of bringing water into contact with a chlorine-type anion exchange resin and an electrolysis step of electrolyzing the water that has undergone the ion exchange step. It is a feature.

According to these configurations, a high-concentration sterilizing washing water can be obtained without adding a chloride ion source such as hydrochloric acid prior to electrolysis and regardless of the water quality of the raw water.

Hereinafter, preferred embodiments of the present invention will be described. However, the scope of the present invention is not limited by the preferred embodiments described below.

As one aspect, the sterilizing and washing water production apparatus according to the present invention is supplied from a water supply source, a bypass portion which is a flow path from the water supply source to the electrolysis portion without passing through the ion exchange portion, and the supply source. It is preferable to further include a distribution unit capable of distributing water to the ion exchange unit and the bypass unit.

According to this configuration, the amount of water circulated to the ion exchange unit can be changed. As a result, for example, when the chloride ion concentration of the raw water is high, the amount of water circulated to the ion exchange unit can be reduced, so that excessive use of the chlorine-type anion exchange resin can be prevented.

As one aspect of the sterilizing washing water production apparatus according to the present invention, it is preferable that the ion exchange unit has an orifice in a portion upstream of the chlorine type anion exchange resin.

According to this configuration, since the flow rate of water in the ion exchange section does not become excessive, a sufficient contact time between water and the chlorine-type anion exchange resin can be secured. As a result, sufficient ion exchange is likely to occur.

As one aspect of the sterilization washing water production apparatus according to the present invention, the ion exchange unit is provided in an upward flow system in which water flows from the lower side to the upper side in the vertical direction at least in a portion having the chlorine type anion exchange resin. It is preferable that it is.

According to this configuration, even if the flow velocity of water is slow, water can float and move uniformly in the portion of the ion exchange section having the chlorine-type anion exchange resin, so that the water and the chlorine-type anion exchange resin can be used together. It is possible to secure a sufficient contact time. As a result, sufficient ion exchange is likely to occur.

As one aspect of the sterilization washing water production apparatus according to the present invention, it is preferable that the electrolysis unit has an electrolysis apparatus capable of producing hypochlorite water.

According to this configuration, electrolysis can be performed using an electrolyzer appropriately designed to produce hypochlorous acid, so that the electrochemical reaction for producing hypochlorous acid can easily proceed.

As one aspect of the sterilization washing water production apparatus according to the present invention, it is preferable that the electrolysis apparatus is an electrolysis apparatus having a positive electrode and a negative electrode in one water tank.

According to this configuration, it is easy to continuously obtain a constant concentration of sterilizing washing water.

As one aspect of the sterilization washing water production apparatus according to the present invention, in the electrolysis apparatus, a positive electrode water tank provided with a positive electrode, a negative electrode water tank provided with a negative electrode, and a space between the positive electrode water tank and the negative electrode water tank are provided. It is preferable that the electrolyzer has an ion exchange membrane for partitioning.

According to this configuration, a known electrolyzer for producing acidic electrolyzed water can be applied.

Further features and advantages of the present invention will be further clarified by the following illustration of exemplary and non-limiting embodiments described with reference to the drawings.

Configuration diagram of hydrogen water server according to the embodiment of the present invention Schematic diagram of the ion exchange section according to the embodiment of the present invention in a state of being filled with a chlorine-type anion exchange resin. A block diagram showing a modified example of the hydrogen water server according to the embodiment of the present invention.

An embodiment of the sterilizing washing water manufacturing apparatus and the sterilizing washing water manufacturing method according to the present invention will be described with reference to the drawings. Hereinafter, an example in which the sterilizing washing water producing apparatus according to the present invention is applied to the sterilizing cleaning water producing apparatus 1 provided in the raw water supply unit Sa of the hydrogen water server S will be described.

[Hydrogen water server configuration]
When hydrogen water is taken in, the hydrogen water server S receives tap water decompressed by the pressure reducing valve R from the water supply (example of a water supply source), and supplies the raw water filtered by the activated charcoal filter F to the downstream process. A raw water supply unit Sa and a hydrogen water production unit Sb for producing hydrogen water by dissolving hydrogen in raw water supplied from the raw water supply unit Sa are provided (FIG. 1). The activated carbon filter F removes oxidizing substances such as residual chlorine contained in tap water. As a result, water from which residual chlorine such as hypochlorous acid, which is a bactericidal component, has been removed flows in the region downstream of the activated carbon filter F, so that an environment in which germs and the like are relatively easy to propagate is formed in the region. To. Therefore, a sterilizing washing water production apparatus 1 is provided in order to periodically sterilize and wash the region in the system downstream of the activated carbon filter F.

In the hydrogen water server S, a sterilization operation for distributing the sterilization wash water produced by the sterilization wash water production apparatus 1 to a region downstream of the activated carbon filter F is periodically performed (for example, once a day, once a week, etc.). ) To sterilize and clean the area. Such a sterilization operation is carried out at a timing when hydrogen water is not produced and supplied. For example, a control unit (not shown) controls the sterilization operation to be automatically performed at a time such as midnight.

In order to enable such control, automatic on-off valves CV1 and CV2 for controlling the flow of tap water decompressed by the pressure reducing valve R are provided. When the automatic on-off valve CV1 is opened, tap water is supplied to the activated carbon filter F. The automatic on-off valve CV2 is provided at the inlet portion of the sterilization washing water production device 1, and when this is opened, tap water is supplied into the sterilization washing water production device 1. The control unit opens the automatic on-off valve CV1 to close the automatic on-off valve CV2 when producing and supplying hydrogen water, and opens the automatic on-off valve CV2 to close the automatic on-off valve CV1 when performing the sterilization operation. Control as follows.

[Structure of sterilization washing water production equipment]
The sterilization washing water production apparatus 1 includes a distribution unit 2, an ion exchange unit 3, a bypass unit 4, and an electrolysis unit 5. Hereinafter, the configuration of each part will be described in order.

An automatic on-off valve CV2 for controlling the flow of tap water decompressed by the pressure reducing valve R is provided at the inlet of the sterilization washing water production apparatus 1, and the tap water is decompressed by opening the automatic on-off valve CV2. Is supplied into the sterilizing washing water production apparatus 1. A distribution unit 2 is provided after the automatic on-off valve CV2. The distribution section 2 is provided with a regulating valve 21 and a regulating valve 22, and tap water is distributed toward the ion exchange section 3 and the bypass section 4 according to the opening degree of the regulating valve 21 and the regulating valve 22. More specifically, the amount of water flowing into the ion exchange unit 3 can be defined by adjusting the opening degree of the adjusting valve 21. Similarly, by adjusting the opening degree of the adjusting valve 22, the amount of water flowing into the bypass portion 4 can be specified.

The ion exchange unit 3 is configured as a tubular member filled with a bead-shaped chlorine-type anion exchange resin 31 (FIG. 2). The ion exchange unit 3 is provided so that the longitudinal direction of the tubular structure faces the vertical direction. The water supplied from the water supply and flowing into the ion exchange section 3 through the distribution section 2 (regulatory valve 21) flows into the ion exchange section 3 from the inlet 32 provided below the ion exchange section 3 through the strainer 34. To do. The water that has flowed into the ion exchange unit 3 comes into contact with the chlorine-type anion exchange resin 31, passes through the strainer 35, and flows out from the outlet 33 provided above the ion exchange unit 3. That is, the ion exchange unit 3 is configured in an upward flow system in which water flows from the lower side in the vertical direction to the upper side with the chlorine type anion exchange resin 31 sandwiched between the upper and lower strainers 34 and 35. The strainers 34 and 35 are provided to prevent the outflow of the chlorine-type anion exchange resin 31.

The chlorine-type anion exchange resin 31 is composed of a polymer having a cationic functional group side chain such as a trimethylammonium group and a dimethylethanolammonium group, and the counterion of the cationic functional group side chain is a chloride ion. .. Commercially available products can be used as the chlorine-type anion exchange resin 31, for example, Minipearl SA series (manufactured by Tozai Kagaku Sangyo Co., Ltd.), Diaion (registered trademark) SA series and PA series (Mitsubishi Chemical Co., Ltd.). , Amberlite (registered trademark) IRA series (manufactured by Organo Co., Ltd.), Dowex (registered trademark) series (manufactured by Dow Chemical Co., Ltd.), Lewattit (registered trademark) series (manufactured by Lanxess), and Purple (registered) (Trademark) series (manufactured by Purplete) and the like are exemplified, but the present invention is not limited thereto.

Further, in the present embodiment, an orifice (not shown) is provided at the lowermost part of the tubular structure of the ion exchange unit 3, that is, between the inlet 32 and the regulating valve 21 to prevent excessive flow of water. With this configuration, it is possible to secure a sufficient time for the water flowing into the ion exchange unit 3 to come into contact with the chlorine-type anion exchange resin 31, so that sufficient ion exchange can be performed. In the present embodiment, the cylindrical structure of the ion exchange unit 3 has an inner diameter of 42 mm and is provided with an orifice having an opening hole with a diameter of 1.0 mm. As a result, the passing flow rate is specified to be 800 mL / min or less under 0.2 MPa water pressure.

The bypass section 4 is a flow path from the water supply to the electrolysis section 5 without passing through the ion exchange section 3. The water that has flowed into the bypass unit 4 via the distribution unit 2 (regulatory valve 22) merges with the water that has flowed out from the ion exchange unit 3 downstream of the outlet 33 of the ion exchange unit 3 and reaches the electrolysis unit 5.

The electrolysis unit 5 is configured to be able to electrolyze the water that has flowed into the electrolysis unit 5 via the ion exchange unit 3 or the bypass unit 4. The electrolysis unit 5 shown in FIG. 1 is an electrolysis device 5a in which a positive electrode 51 and a negative electrode 52 are inserted in one electrolytic cell.

The water flowing out from the electrolysis unit 5 is sterilizing and washing water containing hypochlorous acid generated by electrolysis.

[Manufacturing method of sterilizing washing water]
Next, a method for producing sterilizing washing water using the sterilizing washing water manufacturing apparatus 1 will be described based on the functions of the functional units described above.

The sterilizing washing water produced by the sterilizing washing water manufacturing apparatus 1 contains hypochlorous acid (HClO) as an active ingredient. As shown in the above formulas (1) and (2), the reaction for generating hypochlorous acid in the electrolysis unit 5 uses chloride ions in water as a starting material. Therefore, in order to obtain sterilizing and washing water having a hypochlorous acid concentration sufficient to have a sufficient sterilizing effect, the amount of water supplied to the electrolysis unit 5 (hereinafter referred to as "electrolyzed raw water") is equal to or more than a predetermined amount (hereinafter referred to as "electrolyzed raw water"). For example, it is required to have a chloride ion (10 mg / L or more). However, the chloride ion concentration of tap water received from the water supply varies depending on the region and the like, and may be less than the above-mentioned predetermined amount.

なお、式中のＲは、塩素型陰イオン交換樹脂３１の高分子主鎖を表す。 Therefore, the sterilizing cleaning water production apparatus 1, the water anion in the ion exchange unit 3 (e.g. Sulfate ion (SO 4 ^_2-), etc.), to replace the chloride ions by chlorine-type anion-exchange resin 31. Taking the case where the cationic functional group side chain of the chlorine-type anion exchange resin 31 is a trimethylammonium group as an example, such an anion exchange reaction is represented by the following formula (3). Due to this ion exchange reaction, when water passes through the ion exchange unit 3, the chloride ion concentration increases.

In addition, R in the formula represents a polymer main chain of a chlorine type anion exchange resin 31.

However, as described above, since the chloride ion concentration of tap water differs depending on the region and the like, the difference between the chloride ion concentration of tap water and the chloride ion concentration preferable for electrolysis differs each time. Therefore, the sterilizing and washing water production apparatus 1 is configured so that the amount (ratio) of water to be subjected to the ion exchange reaction can be changed according to the chloride ion concentration of tap water. Specifically, by distributing the water supplied from the water supply to the ion exchange unit 3 and the bypass unit 4, only a part of the water finally supplied to the electrolysis unit 5 is ion-exchanged. It can be used for the reaction. That is, the chloride ion concentration of the water distributed to the ion exchange unit 3 increases due to the ion exchange reaction, but the chloride ion concentration of the water distributed to the bypass unit 4 does not increase, so the distribution ratio should be adjusted. The chloride ion concentration of the water (electrolyzed raw water) after merging can be arbitrarily adjusted.

More specifically, when the chloride ion concentration of the electrolyzed raw water is 10 mg / L or more, an effective amount of hypochlorous acid can be obtained by electrolysis. Therefore, the flow rate of the water distributed to the ion exchange section 3 and the bypass section 4 is adjusted so that the chloride ion concentration of the electrolyzed raw water is about 10 mg / L. The higher the chloride ion concentration of the electrolyzed raw water, the higher the bactericidal effect of the obtained sterilizing wash water, but on the other hand, if the amount of water distributed to the ion exchange unit 3 is large, the chlorine-type anion exchange resin 31 tends to deteriorate, and it becomes necessary to regenerate the chlorine-type anion exchange resin 31 more frequently. In view of this situation, as long as the chloride ion concentration (about 10 mg / L) of the electrolyzed raw water that can obtain the necessary and sufficient bactericidal effect is realized, as little tap water as possible is distributed to the ion exchange unit 3. It is better to do so.

When the chloride ion concentration of tap water is much lower than 10 mg / L (for example, 5 mg / L), the entire amount of water supplied from the water supply is distributed to the ion exchange unit 3 (close the regulating valve 22). Only the regulating valve 21 is opened).

Further, when the chloride ion concentration of tap water is slightly less than 10 mg / L (for example, 8 mg / L), if the entire amount of water supplied from the water supply is distributed to the ion exchange unit 3, the electrolyzed raw water is prepared. Chloride ion concentration may exceed 10 mg / L. However, as described above, if the distribution ratio is set so as to increase the chloride ion concentration by more than 10 mg / L, the chlorine-type anion exchange resin 31 deteriorates faster. From the above, it is preferable to distribute the minimum amount of water to the ion exchange unit 3 as long as the chloride ion concentration of the electrolyzed raw water is 10 mg / L or more. Specifically, the opening degree of the adjusting valves 21 and 22 is adjusted to adjust the amount of water distributed to the ion exchange unit 3 and the bypass unit 4, so that the chloride ion concentration of the electrolyzed raw water is about 10 mg / L. To be.

When the chloride ion concentration of tap water is 10 mg / L or more, it is not necessary to increase the chloride ion concentration by ion exchange, so that the entire amount of water supplied from the water supply is distributed to the bypass section 4. (The adjusting valve 21 is closed and only the adjusting valve 22 is opened). In this case as well, deterioration of the chlorine-type anion exchange resin 31 can be prevented.

More specifically, when the hydrogen water server S is installed, or at any time after the installation, the chloride ion concentration of tap water supplied to the hydrogen water server S is measured, and the measured chloride ion concentration is measured. Based on the above, the flow rate of water distributed to the ion exchange unit 3 and the bypass unit 4 (opening of the adjusting valves 21 and 22) is determined. Here, the chloride ion concentration of tap water may be measured using a commercially available chloride ion meter, or may be calculated based on the electrical conductivity measured using a commercially available conductivity meter.

According to the method for producing sterilizing washing water described above, sterilizing washing water having a residual chlorine concentration of ₂ mgCl 2 / L or more can be obtained without adding a chloride ion source. Can be implemented as a target. This makes it possible to realize an automatic and regular sterilization and cleaning operation of the hydrogen water server S. Further, since high-concentration sterilizing and washing water can be obtained regardless of the quality of the raw water, automatic and regular sterilizing and washing operation can be realized regardless of the installation location of the hydrogen water server S.

[Modification example]
Hereinafter, a modified example of the sterilizing washing water production apparatus 1 will be described. In the sterilization washing water production apparatus 1 shown in FIG. 3, the electrolysis unit 5 includes a positive electrode tank 54 in which the positive electrode 51 contacts the inflowing water, a negative electrode tank 55 in contact with the negative electrode 52, and a positive electrode tank 54 and a negative electrode tank 55. It is configured as a known electrolyzer 5b for producing acidic electrolyzed water, which has an ion exchange membrane 53 that separates the electrodes. Here, examples of the ion exchange membrane 53 include, but are not limited to, the Neocepta (registered trademark) series (manufactured by Astom Co., Ltd.) and the Nafion (registered trademark) series (manufactured by Sigma-Aldrich).

As described above, as the electrolysis unit 5, a device having a structure having a positive electrode 51 and a negative electrode 52 in one water tank such as the electrolysis device 5a may be used, or a positive electrode tank 54 like the electrolysis device 5b may be used. An apparatus having a structure in which the negative electrode tank 55 and the negative electrode tank 55 are separated by an ion exchange film 53 may be used, and any electrolysis apparatus that produces hypochlorous acid from the positive electrode 51 can be used. However, a device having a positive electrode 51 and a negative electrode 52 in one water tank, such as the electrolyzer 5a, is simpler and more convenient.

[Other Embodiments]
Finally, other embodiments of the sterilizing washing water manufacturing apparatus and the sterilizing washing water manufacturing method according to the present invention will be described. The configurations disclosed in each of the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction.

In the above embodiment, the sterilizing washing water production apparatus 1 provided for sterilizing the hydrogen water server S has been described as an example. However, without being limited to such a configuration, the sterilizing and washing water production device according to the present invention can also be used for a disaster water purification device, a water server, a hand washing device, a humidifier, and the like.

In the above embodiment, a configuration in which the bypass unit 4 is provided and the distribution unit 2 for distributing tap water to the ion exchange unit 3 and the bypass unit 4 is provided will be described as an example. However, the sterilizing washing water production apparatus according to the present invention does not necessarily have to include a bypass unit and a distribution unit. However, when the bypass part and the distribution part are provided as in the above embodiment, the amount of water flowing through the ion exchange part can be reduced when the chloride ion concentration of tap water is relatively high, so that the chlorine type Deterioration of the anion exchange resin can be suppressed.

In the above embodiment, the distribution unit 2 is mounted as the adjustment valve 21 and the adjustment valve 22, and the amount of water flowing into each of the ion exchange unit 3 and the bypass unit 4 by adjusting the opening degree of the adjustment valves 21 and 22. The configuration that defines is described as an example. Further, in this configuration, it has been described that the chloride ion concentration of tap water taken in at the installation location of the hydrogen water server S is measured in advance, and the opening degrees of the adjusting valves 21 and 22 are determined based on the concentration. However, the distribution unit in the present invention is not limited to such a configuration, and can be implemented by any device capable of controlling the amount of water flowing into a plurality of flow paths. For example, a measuring device capable of measuring the chloride ion concentration of water flowing into the electrolysis section is provided, and the amount of water flowing into each of the ion exchange section and the bypass section is dynamically controlled based on the measured value of the measuring device. The system may be provided as a distribution unit. Such a system controls, for example, a measuring instrument capable of measuring the chloride ion concentration, a control valve capable of electronically controlling the opening degree thereof, and a control valve opening degree based on the measured value of the chloride ion concentration. Will include control devices, such as computers.

In the above embodiment, a configuration in which an orifice is provided in the ion exchange unit 3 and the flow rate thereof is defined will be described as an example. However, the present invention is not limited to such a configuration, and the ion exchange unit according to the present invention does not have to have an orifice. In addition, instead of the orifice, a known flow rate control means such as a regulating valve may be provided, or such a flow rate control means may not be provided.

In the above embodiment, the ion exchange unit 3 is provided so that the longitudinal direction of the tubular structure faces the vertical direction, and is configured in an upward flow system so that water flows from the lower side to the upper side in the vertical direction. An example has been described. However, the ion exchange unit 3 does not necessarily have to be installed along the vertical direction without being limited to such a configuration. Further, even when the ion exchange unit 3 is installed along the vertical direction, it may be configured in a downward flow system in which water flows from the upper side to the lower side in the vertical direction. However, as in the above embodiment, if at least the portion of the ion exchange section having the chlorine-type anion exchange resin is configured in the upward flow method, the ion exchange section may have a gentle flow velocity. Since water can float and move uniformly in the portion having the chlorine-type anion exchange resin, it is easy to secure the contact time between the water and the chlorine-type anion exchange resin, and sufficient ion exchange is easily performed.

As described above, as the electrolysis cell of the electrolysis unit 5 according to the present invention, either a hydrostatic electrolysis cell or a running water electrolysis cell can be used. However, it is preferable to use a running water type electrolytic cell because it is easy to continuously obtain a constant concentration of sterilizing washing water.

In the above embodiment, the configuration in which the pressure reducing valve R is connected to the water supply and enters the distribution unit 2 has been described as an example. However, the water supply source in the present invention is not limited to such a configuration, and the configuration is not particularly limited as long as water can be supplied to the ion exchange unit. The sterilizing and washing water production apparatus according to the present invention may be configured to receive water from a water source such as a tank. In addition, ancillary components such as a pressure reducing valve and a strainer may be appropriately provided according to the needs in the overall configuration of the sterilizing washing water production apparatus and the equipment and apparatus on which the sterilizing washing water production apparatus is mounted.

It should be understood that with respect to other configurations, the embodiments disclosed herein are exemplary in all respects and the scope of the invention is not limited thereto. Those skilled in the art will be able to easily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Therefore, another embodiment modified without departing from the spirit of the present invention is naturally included in the scope of the present invention.

Hereinafter, the present invention will be further described with reference to examples. The following examples do not limit the present invention.

[First test]
In the first test, the residual chlorine concentration when water was electrolyzed under various conditions was examined.

"Test method"
Test water is circulated through the electrolysis cell of the electrolytic chlorine generator "CG unit" used in "Riostar TYPE201" manufactured by Tozai Kagaku Sangyo Co., Ltd. at a flow rate of 800 mL / min, and electricity is applied under the conditions shown in Table 1. It was disassembled. The free residual chlorine concentration and total residual chlorine concentration of water after electrolysis were measured using a portable digital water quality meter "Onsite Lab CL101" manufactured by Tozai Kagaku Sangyo Co., Ltd., and hypochlorous acid generated by electrolysis was measured. The concentration was identified.

<< Examples 1 to 4 >>
Test water containing a chloride ion concentration of 15 mg / L and an electrical conductivity of 13.5 mS / m and containing no residual chlorine was electrolyzed under the conditions shown in Table 1. As shown in Examples 1 to 4, when the voltage value applied during electrolysis increased, the flowing current value increased. In addition, the free residual chlorine concentration and the total residual chlorine concentration increased as the current value increased.

<< Comparative Examples 1 and 2 >>
Test water containing a chloride ion concentration of 2.5 mg / L and an electrical conductivity of 6.5 mS / m and containing no residual chlorine was electrolyzed under the conditions shown in Table 1. In Comparative Examples 1 and 2, the same current as in Examples 2 and 3 was allowed to flow, respectively, but the applied voltage required at that time was larger than that in Examples 2 and 3. Moreover, even if the voltage value and the current value increased, the free residual chlorine concentration and the total residual chlorine concentration hardly increased.

"result"
In Examples 1 to 4 using test water having a chloride ion concentration of 15 mg / L, an increase in the residual chlorine concentration was observed due to electrolysis. That is, it is considered that hypochlorous acid was generated by electrolysis. On the other hand, in Comparative Examples 1 and 2 using the test water having a chloride ion concentration of 2.5 mg / L, it is considered that the residual chlorine concentration hardly increased due to electrolysis, and hypochlorous acid was hardly generated. ..

[Second test]
In the second test, the increase in chloride ions in the ion exchange unit 3 was examined for the sterilizing washing water production apparatus 1 having the configuration shown in FIG.

"Test method"
As the test device, the sterilizing washing water production device 1 having the configuration shown in FIG. 1 was used. As the ion exchange unit 3, an ion exchange tower is used in which a cylindrical body having an inner diameter of 42 mm, a height of 245 mm, and an internal volume of 340 mL is filled with 340 mL of chlorine-type anion exchange resin Minipearl SA-10P (manufactured by Tozai Kagaku Sangyo Co., Ltd.). There was.

As the test water, tap water having a chloride ion concentration of 7.8 mg / L and having residual chlorine removed was used. The test water was passed through upward currents having different flow velocities, and the chloride ion concentration before and after the ion exchange unit 3 was measured. As shown in Table 2 below, seven levels of tests were conducted in the range of a flow velocity of 200 to 1,100 mL / min, and used as Examples 5 to 10 and Comparative Example 3, respectively. Table 2 also shows the values obtained by converting the flow velocities of each embodiment into linear velocities (LV).

The chloride ion concentration was measured using a portable chloride measuring instrument HI96753 (manufactured by Hannah Instruments).

"result"
In Examples 5 to 10 using the test water having a chloride ion concentration of 7.8 mg / L, an increase of approximately 10 mg / L in chloride ions could be observed in any range. That is, it can be said that almost all of the anionic substances such as sulfate ions contained in the test water were exchanged for chloride ions.

That is, it was found that an increase in chloride ion concentration of 10 mg / L can be expected in the range where the linear velocity of water in the ion exchange unit 3 is 10 to 40 m / hr. By utilizing this finding, it is possible to obtain electrolyzed raw water having a desired chloride ion concentration based on the difference between the chloride ion concentration of the supplied water and the desired chloride ion concentration (10 mg / L). The distribution of water (the flow rate of water distributed to the ion exchange unit 3 and the bypass unit 4) can be calculated.

[Third test]
In the third test, with respect to the sterilizing washing water producing apparatus 1 having the configuration shown in FIG. 1, the flow rate of water distributed to each of the ion exchange section 3 and the bypass section 4 and the chloride ion concentration of the obtained sterilizing washing water. I examined the relationship with.

"Test method"
As the test device, the sterilizing washing water production device 1 having the configuration shown in FIG. 1 was used. As the ion exchange unit 3, an ion exchange tower is used in which a cylindrical body having an inner diameter of 42 mm, a height of 245 mm, and an internal volume of 340 mL is filled with 340 mL of chlorine-type anion exchange resin Minipearl SA-10P (manufactured by Tozai Kagaku Sangyo Co., Ltd.). There was. As the electrolyzer, the electrolysis cell of the electrolytic chlorine generator "CG unit" used in "Riostar TYPE201" manufactured by Tozai Kagaku Sangyo Co., Ltd. was used.

In the above test apparatus, test water having a chloride ion concentration of 8.6 mg / L and an electrical conductivity of 13.31 mS / m and containing no residual chlorine was supplied to the distribution unit 2 and sterilized by flowing out from the electrolysis unit 5. Washing water was collected and the chloride ion concentration, electrical conductivity and residual chlorine concentration were measured. The conditions for electrolysis in the electrolysis unit 5 were a fixed current of 1.8 A and a maximum voltage of up to 18 V.

"Measuring method"
The chloride ion concentration of the test water and the collected sterilized washing water was measured using a portable chloride measuring device HI96753 (manufactured by Hannah Instruments). The electrical conductivity was measured using a "CD-4301" digital conductivity meter manufactured by LUTRON. Then, the free residual chlorine concentration and the total residual chlorine concentration of the water after electrolysis were measured using a portable digital water quality meter "Onsite Lab CL101" manufactured by Tozai Kagaku Sangyo Co., Ltd., and hypochlorous acid generated by electrolysis was measured. The concentration of acid was identified.

<< Example 11 >>
The regulating valve 22 was closed and the regulating valve 21 was opened, and the entire amount of the test water was circulated to the ion exchange unit 3. The flow rate was 1,100 mL / min. The chloride ion concentration, electrical conductivity, and residual chlorine concentration of the obtained sterilized washing water were as follows.
Chloride ion concentration 12.3 mg / L
Electrical conductivity 13.9mS / m
Free Residual Chlorine 4.2mgCl ₂ / L
Total Residual Chlorine 4.2mgCl ₂ / L

<< Example 12 >>
The opening degrees of the adjusting valves 21 and 22 were adjusted so that the test water was distributed 1: 1 to the ion exchange section 3 and the bypass section 4. The total flow rate was 1,100 mL / min. The chloride ion concentration, electrical conductivity and residual chlorine concentration of the obtained sterilized washing water were as follows.
Chloride ion concentration 10.6 mg / L
Electrical conductivity 13.5mS / m
Free Residual Chlorine 2.4mgCl ₂ / L
Total Residual Chlorine 2.4mgCl ₂ / L

<< Comparative Example 4 >>
The regulating valve 21 was closed and the regulating valve 22 was opened, and the entire amount of the test water was circulated to the bypass section 4. The flow velocity was 1,100 mL / min. The chloride ion concentration, electrical conductivity and residual chlorine concentration of the obtained sterilized washing water were as follows.
Chloride ion concentration 8.6 mg / L
Electrical conductivity 13.3 mS / m
Free Residual Chlorine 1.7 mg Cl ₂ / L
Total Residual Chlorine 1.7mgCl ₂ / L

"result"
As described above, in Examples 11 and 12 in which all or part of the test water was distributed to the ion exchange unit 3, the chloride ion concentration after electrolysis was 10 mg / L or more. Therefore, it can be said that the residual chloric acid concentration of the sterilizing washing water obtained in Examples 11 and 12 is ₂ mgCl 2 / L or more, which is a level sufficient to have a sufficient sterilizing washing effect. On the other hand, in Comparative Example 4 in which the total amount of the test water did not flow through the ion exchange unit 3, the chloride ion concentration after electrolysis was 8.6 mg / L, and the residual chloric acid concentration of the obtained sterilization washing water was _{It was 2} mgCl 2 / L or less. The sterilizing and washing water obtained in Comparative Example 4 cannot be said to exhibit a sufficient sterilizing and washing effect, and is not suitable for use in a system in which a biofilm is violently formed, for example.

The present invention can be used, for example, in a sterilizing washing water production apparatus and a sterilizing washing water manufacturing method for sterilizing and cleaning the inside of a hydrogen water server system on a regular basis.

1: Sterilizing and washing water production equipment 2: Distributing parts 21, 22: Adjusting valve 3: Ion exchange part 31: Chlorine type anion exchange resin 32: Inlet 33: Outlet 34, 35: Strainer 4: Bypass part 5: Electrolysis part 5a, 5b: Electrolyzer 51: Positive electrode 52: Negative electrode 53: Ion exchange membrane 54: Positive electrode tank 55: Negative electrode tank S: Hydrogen water server R: Pressure reducing valve Sa: Raw water supply section Sb: Hydrogen water production section CV1, CV2: Automatic on-off valve F: Activated carbon filter

Claims (8)

An ion exchange unit having a chlorine-type anion exchange resin and configured so that the water and the chlorine-type anion exchange resin come into contact with each other when water is circulated.
A sterilizing and washing water production apparatus including an electrolyzing unit capable of electrolyzing the water circulated through the ion exchange unit. A bypass section that is a flow path from the water supply source to the electrolysis section without passing through the ion exchange section.
The sterilizing and washing water production apparatus according to claim 1, further comprising a distribution unit capable of distributing water supplied from the supply source to the ion exchange unit and the bypass unit. The sterilizing washing water production apparatus according to claim 1 or 2, wherein the ion exchange unit has an orifice in a portion upstream of the chlorine-type anion exchange resin. The item according to any one of claims 1 to 3, wherein the ion exchange unit is provided in an upward flow system in which water flows from the lower side to the upper side in the vertical direction at least in a portion having the chlorine type anion exchange resin. Sterilized washing water production equipment. The sterilizing and washing water production apparatus according to any one of claims 1 to 4, wherein the electrolysis unit has an electrolysis apparatus capable of producing hypochlorous acid water. The sterilization washing water production device according to claim 5, wherein the electrolysis device is an electrolysis device having a positive electrode and a negative electrode in one water tank. The electrolyzer is an electrolyzer having a positive electrode water tank provided with a positive electrode, a negative electrode water tank provided with a negative electrode, and an ion exchange membrane partitioning between the positive electrode water tank and the negative electrode water tank. 5. The sterilizing and washing water production apparatus according to 5. An ion exchange process that brings water into contact with a chlorine-type anion exchange resin,
A method for producing sterilizing and washing water, comprising an electrolysis step of electrolyzing water that has undergone the ion exchange step.

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