JP4740892B2 - Weakly acidic chlorine water circulation device - Google Patents

Description

  The present invention relates to a weakly acidic chlorinated water circulation device used for sterilization of foods, for example.

  For example, a hypochlorite aqueous solution such as sodium hypochlorite is generally used as a disinfectant for sterilizing an object to be sterilized such as food. This aqueous hypochlorite aqueous solution has a relatively high hydrogen ion index (hereinafter referred to as “pH”) (for example, pH 8 or more) and is often used in this state. The abundance of acid ions is increased (see FIG. 9), and the bactericidal power in this case is relatively weak.

  Therefore, in order to exert a stronger sterilizing power in the hypochlorite aqueous solution, it is desirable to lower the pH and increase the abundance of hypochlorous acid (see FIG. 9), but if this pH is too low (For example, pH 4 or less), a large amount of toxic chlorine gas is generated, which is not preferable.

  Therefore, it is desirable to adjust the pH of the hypochlorite aqueous solution to be in a slightly acidic state of about 6 in order to exert high sterilizing power while suppressing generation of chlorine gas. For example, a hydrochloric acid aqueous solution is used for adjusting the pH of the hypochlorite aqueous solution. By mixing a hypochlorite aqueous solution with a hydrochloric acid aqueous solution and diluting with diluted water, weakly acidic chlorinated water having a high bactericidal effect is produced.

  In order to sterilize an object to be sterilized such as food using the weakly acidic chlorinated water generated in this way, a predetermined weakly acidic chlorinated water is stored in a sterilization tank, and the sterilized object is put into the sterilized tank. It is common to sterilize.

  When sterilizing an object to be sterilized as described above, it is considered that the pH and concentration of the weakly acidic chlorinated water in the sterilization tank is changed and the sterilization power is reduced by putting the sterilization object into the sterilization tank. It is done. In order to prevent this, the weakly acidic chlorine water in the sterilization tank is discharged, and a hypochlorite aqueous solution and hydrochloric acid aqueous solution are further mixed with this weakly acidic chlorine water to regenerate it as weakly acidic chlorine water having a desired pH. However, it is desirable to put this in the sterilization tank again and circulate it.

  However, if the aqueous hydrochloric acid solution and the hypochlorite aqueous solution are mixed at once with the weakly acidic chlorinated water discharged from the sterilization tank, the hypochlorite aqueous solution and the aqueous hydrochloric acid solution are not uniformly mixed, and locally. A high concentration hypochlorite aqueous solution and a high concentration hydrochloric acid aqueous solution come into contact with each other, which may generate a large amount of toxic chlorine gas.

  The present invention has been made in view of the above circumstances, and produced weakly acidic chlorinated water in which hypochlorite aqueous solution and hydrochloric acid aqueous solution are diluted stepwise to suppress generation of chlorine gas. It is an object of the present invention to provide a weakly acidic chlorinated water circulation device that supplies chlorinated water to a sterilization tank so that an object to be sterilized can always be sterilized.

  The present invention is for solving the above-mentioned problems, and a weakly acidic chlorine water production apparatus for producing weakly acidic chlorine water having a predetermined hydrogen ion index, and a weakly acidic chlorine water produced by this weakly acidic chlorine water production apparatus. A sterilization tank for storing water and sterilizing a predetermined object to be sterilized, a first supply line for supplying weak acid chlorine water produced by a weak acid chlorine water production apparatus to the sterilization tank, and discharged from the sterilization tank A circulation line that circulates the weakly acidic chlorinated water is constituted by the second supply line that supplies the weakly acidic chlorinated water to the weakly acidic chlorinated water production apparatus, and a circulation pump that circulates the weakly acidic chlorinated water is provided in this circulation line. A weakly acidic chlorinated water circulation device, wherein the weakly acidic chlorinated water discharged from the sterilization tank is supplied to the weakly acidic chlorinated water production device and used in the weakly acidic chlorinated water production device. The weakly acidic chlorinated water production apparatus can be used as a diluting water for diluting an aqueous solution and a hypochlorite aqueous solution. A supply device for supplying an aqueous hydrochloric acid solution, a second supply path for supplying dilution water for diluting the hypochlorite aqueous solution, a supply apparatus for supplying a hypochlorite aqueous solution to the second supply path, The first supply path and the second supply path are merged, and the hydrochloric acid aqueous solution diluted in the first supply path and the hypochlorite aqueous solution diluted in the second supply path are mixed and diluted to obtain a predetermined amount. A third supply path for supplying weakly acidic chlorine water having a hydrogen ion index, and a first inlet for injecting a hydrochloric acid aqueous solution supplied from a hydrochloric acid aqueous solution supply device; When located downstream of the inlet And a first mixing / dilution unit for diluting the aqueous hydrochloric acid solution injected from the first injection port with the dilution water by causing flow resistance, and hypochlorous acid is provided in the second supply path. A second inlet for injecting a hypochlorite aqueous solution supplied from the salt water supply device and a downstream side of the second inlet and injecting from the second inlet with a flow resistance. A second mixed dilution section for mixing and diluting the hypochlorite aqueous solution with dilution water is provided, and the third supply path is diluted with the first mixed dilution section by generating a flow resistance. A third mixed dilution unit is provided that generates weakly acidic chlorine water having a predetermined hydrogen ion index by mixing and diluting the aqueous hydrochloric acid solution and the hypochlorite aqueous solution diluted in the second mixed dilution unit. It is characterized by being.

  When an object to be sterilized such as food is put into the sterilization tank and sterilized, the weakly acidic chlorinated water in the sterilization tank has a high pH and a low concentration due to the influence of moisture etc. from the object to be sterilized. The weakly acidic chlorinated water thus supplied is supplied to the weakly acidic chlorinated water production device and used as dilution water for diluting the hydrochloric acid aqueous solution and hypochlorite aqueous solution used in this weakly acidic chlorinated water producing device. Is done.

  The weakly acidic chlorinated water circulation device generates weak flow rate resistance in the first mixing and dilution part of the first supply path of the weakly acidic chlorinated water production device, so that weakly acidic chlorinated water (diluted water supplied from the second supply line ( Hereinafter, it is simply referred to as “diluted water”) and an aqueous hydrochloric acid solution injected from the first supply device can be mixed and diluted uniformly. In addition, the flow rate resistance is generated in the second mixing and dilution part of the second supply path, so that the dilution water supplied from the second supply line and the hypochlorite aqueous solution can be mixed and diluted uniformly. it can.

  Then, a flow resistance is generated in the third mixing and dilution part of the third supply path, and the hydrochloric acid aqueous solution diluted in the first supply path and the hypochlorite aqueous solution diluted in the second supply path are mixed. By diluting evenly, it is possible to generate (regenerate) weakly acidic chlorine water having a predetermined pH that can suppress generation of chlorine gas. By injecting the weakly acidic chlorine water generated in this way into the sterilization tank through the first supply line, the weakly acidic chlorine water circulation device can always sterilize the sterilization target with high sterilization power.

  The first supply path is provided at a position upstream of the first inlet, and adjusts the flow rate of dilution water flowing through the first supply path, and a first pressure gauge that measures the pressure in the first supply path. A second pressure gauge provided at a position upstream of the second inlet and measuring the pressure in the second supply path; and a first supply path. The structure provided with the 2nd flow volume adjustment valve which adjusts the flow volume of the dilution water which flows through can be employ | adopted.

  According to this configuration, the first pressure gauge is provided in the first supply path, and the second pressure gauge is provided in the second supply path, thereby reading the pressure difference of the dilution water flowing through the first supply path and the second supply path. Will be able to. When there is a pressure difference between the first supply path and the second supply path, the difference is eliminated by operating the first flow rate adjustment valve and the second flow rate adjustment valve, for example, the first supply path and the second supply path. The amount of dilution water flowing through the path can be made equal.

  Further, in the weakly acidic chlorinated water circulation device according to the present invention, the first mixing and diluting unit includes a plate member in which a plurality of through holes are formed inside, and generates a flow resistance on the upstream side of the plate member to generate a hydrochloric acid aqueous solution. And the diluting water are mixed, and the hydrochloric acid aqueous solution is passed through the through-hole of the plate member together with the diluting water, so that the hydrochloric acid aqueous solution can be diluted to a predetermined concentration. A configuration in which the first flow rate adjustment valve is provided on the downstream side of the dilution unit can be employed.

  According to this configuration, by providing the plate member in the first mixing / dilution unit, flow resistance is generated in the upstream portion of the plate member of the first mixing / dilution unit, and the hydrochloric acid aqueous solution and the dilution water are mixed in this portion. Then, the aqueous hydrochloric acid solution and the diluted water diffuse through the through holes of the plate member, so that the aqueous hydrochloric acid solution can be diluted uniformly. Furthermore, by providing the first flow rate adjusting valve on the downstream side of the first mixing and diluting section, the flow resistance of the plate member can be adjusted, thereby changing the flow rate of the dilution water and the amount of the injected hydrochloric acid aqueous solution. Accordingly, the aqueous hydrochloric acid solution can be diluted to a desired concentration.

  Further, in the weakly acidic chlorinated water circulation device according to the present invention, the second mixing and diluting unit includes a plate member in which a plurality of through holes are formed inside, and generates a flow resistance on the upstream side of the plate member, thereby reducing the hypothesis. The chlorite aqueous solution and the dilution water are mixed, and the hypochlorite aqueous solution is passed through the through hole of the plate member together with the dilution water, so that the hypochlorite aqueous solution can be diluted to a predetermined concentration. And the 2nd supply path can employ | adopt the structure provided with the 2nd flow volume adjustment valve in the downstream of the 2nd mixing dilution part.

  According to such a configuration, by providing the plate member in the second mixed dilution section, flow resistance is generated in the upstream portion of the plate member of the second mixed dilution section, and in this portion, the hypochlorite aqueous solution and the dilution water are generated. And the hypochlorite aqueous solution and the dilution water diffuse through the through-holes of the plate member, whereby the hypochlorite aqueous solution can be diluted uniformly. Further, by providing a second flow rate adjusting valve downstream of the second mixing and diluting section, the flow resistance of the plate member can be adjusted, whereby the flow rate of diluted water and the injected hypochlorite aqueous solution can be adjusted. The hypochlorite aqueous solution can be diluted to a desired concentration according to the change in the amount of.

Further, the weakly acidic chlorinated water circulation device according to the present invention is provided with a plate member in which a plurality of through holes are formed in the third mixed dilution section, and the third mixed dilution section is diluted with the first mixed dilution section. solution and with mixing caused the flow resistance and a hypochlorite solution diluted in the second mixing dilution unit upstream of the plate member, mixed and hypochlorite solution and hydrochloric acid solution By passing through the through-hole of the plate member, it is configured to generate weakly acidic chlorinated water having a predetermined hydrogen ion index, and the third supply path is arranged on the downstream side of the third mixing and diluting unit to adjust the third flow rate. A configuration including a valve can be employed.

  According to such a configuration, by providing a plate member in the third mixed dilution section, flow resistance is generated in the upstream portion of the plate member of the third mixed dilution section, and the diluted hypochlorite aqueous solution and hydrochloric acid aqueous solution are diluted. Are mixed in this portion, and the hypochlorite aqueous solution and the hydrochloric acid aqueous solution diffuse through the through-holes of the plate member, so that uniformly diluted weakly acidic chlorinated water can be generated. And by operating the 3rd flow regulating valve provided in the lower stream side of the 3rd mixing dilution part, while being able to adjust the flow volume of the weak acidic chlorine water produced | generated in the 3rd mixing dilution part, 3rd It becomes possible to adjust the pressure in the mixed dilution part, and thereby, the inside of the third mixed dilution part can be set to a desired pressure environment.

  Further, the weakly acidic chlorinated water circulation device according to the present invention is a hypochlorite aqueous solution supplying device in which hypochlorite aqueous solution is supplied in an amount corresponding to the chlorine concentration of weakly acidic chlorinated water that is dilution water supplied from the second supply line. The chlorate aqueous solution is controlled to be supplied to the second supply path, and the hydrochloric acid aqueous solution supply device has an amount corresponding to the amount of the hypochlorite aqueous solution supplied from the hypochlorite aqueous solution supply device. A configuration in which the hydrochloric acid aqueous solution is controlled to be supplied to the first supply path can be employed.

  According to this configuration, a predetermined amount of hypochlorite aqueous solution is supplied to the second supply path according to the chlorine concentration in the weakly acidic chlorinated water as dilution water supplied from the second supply line by so-called concentration proportional control. Then, by supplying an aqueous hydrochloric acid solution in an amount corresponding to the amount of the hypochlorite aqueous solution to the first supply path, weakly acidic chlorinated water having a desired pH can be generated.

  According to the present invention, a weakly acidic chlorine water that suppresses generation of chlorine gas by diluting a hypochlorite aqueous solution and a hydrochloric acid aqueous solution in stages is produced, and this weakly acidic chlorine water is supplied to a sterilization tank, The object to be sterilized can be sterilized with high sterilization power at all times.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the weakly acidic chlorinated water circulation device 1 includes a weakly acidic chlorinated water production device 2 that produces weakly acidic chlorinated water having a predetermined hydrogen ion index, and a weak acid chlorinated water produced by the weakly acidic chlorinated water producing device 2. A sterilization tank 3 for storing acidic chlorinated water and sterilizing a predetermined sterilization target, a first supply line 4 for supplying weakly acidic chlorinated water produced by a weakly acidic chlorinated water production apparatus to the sterilizing tank 3, and sterilization A weak acid chlorine water discharged from the tank 3 is provided with a second acid supply line 5 for supplying the weak acid chlorine water to the weak acid chlorine water production apparatus 2. A circulation pump 7 for circulating the weakly acidic chlorinated water is provided.

  When a predetermined amount of weakly acidic chlorinated water is stored in the sterilization tank 3, the weakly acidic chlorinated water circulation device 1 performs sterilization by putting an object to be sterilized into the sterilization tank 3, and the sterilization tank 3 whose pH is increased by sterilization. The weakly acidic chlorine water is regenerated by the weakly acidic chlorine water production apparatus 2 in the circulation line 6 and supplied to the sterilization tank 3 through the first supply line 4.

  When an object to be sterilized such as various foods (vegetables, etc.) is put into the sterilization tank 3, the chlorine concentration of the weakly acidic chlorinated water in the sterilization tank 3 decreases due to organic substances and other components emitted from the object to be sterilized. However, the sterilizing power gradually decreases as the pH value changes. The weakly acidic chlorinated water having reduced sterilizing power is discharged from the sterilizing tank 3 and sent to the weakly acidic chlorinated water production apparatus 2 through the second supply line 5, and an aqueous hydrochloric acid solution and an aqueous hypochlorite solution are injected. At this time, it is used as dilution water for diluting the aqueous hydrochloric acid solution and the aqueous hypochlorite solution. Hereinafter, the weakly acidic chlorine water discharged from the sterilization tank 3 may be simply referred to as “dilution water”.

  As shown in FIG. 1, the first supply line 4 of the weakly acidic chlorinated water circulation device 1 has one end connected to the downstream side of the third supply path 15 and the other end connected to the upper side of the sterilization tank 3. Then, the weakly acidic chlorine water generated in the third supply path 15 can be injected into the sterilization tank 3. The second supply line 5 is connected to the lower side of the sterilization tank 3, and the circulation pump 7 is provided in the middle of the second supply line 5. On the downstream side of the second supply line 5, a weakly acidic chlorine water production apparatus 2 is provided.

  As shown in FIGS. 1 and 2, this weakly acidic chlorinated water production apparatus 2 dilutes a hypochlorite aqueous solution and a hydrochloric acid aqueous solution with a dilution water, and mixes the diluted hypochlorite aqueous solution and the hydrochloric acid aqueous solution. And further diluted to produce weakly acidic chlorinated water having a predetermined pH. In this embodiment, a sodium hypochlorite aqueous solution having a predetermined concentration is used as an example of the hypochlorite aqueous solution. As a stock solution of a hydrochloric acid aqueous solution used as a pH adjuster for a hypochlorite aqueous solution, a solution having a predetermined weight percent concentration is used. This aqueous hydrochloric acid solution is particularly useful in that it is not affected by organic substances. In the present embodiment, “weakly acidic” means a range of pH 5 to 7 (pH 7 is strictly speaking neutral, but is treated as “weakly acidic” here).

  The weakly acidic chlorinated water production apparatus 2 is connected to the second supply line 5 and supplies a main supply path 10 for supplying dilution water, a first supply path 11 for supplying dilution water for diluting an aqueous hydrochloric acid solution, A supply device (hereinafter referred to as “first supply device”) 12 for supplying a hydrochloric acid aqueous solution to the supply path 11 and a dilution water for diluting the hypochlorite aqueous solution for supplying the hydrochloric acid aqueous solution to the first supply path 11 are supplied. The second supply path 13, the supply apparatus (hereinafter referred to as “second supply apparatus”) 14 for supplying a hypochlorite aqueous solution to the second supply path 13, the first supply path 11 and the second supply path 13 are merged. In addition, the aqueous hydrochloric acid diluted in the first supply path 11 and the hypochlorite aqueous solution diluted in the second supply path 13 are mixed and diluted, so that weakly acidic chlorine water having a predetermined hydrogen ion index is obtained. The third supply path 15 for generating , A supply device (hereinafter referred to as “third supply device”) 16 for supplying a pH adjusting agent for adjusting the pH of the dilution water supplied from the second supply line 5 to the first supply path 11, and the first supply device 12. , A second supply device 14, a control device 18 for controlling the third supply device 16, and the like.

  The main supply path 10 is provided with a flow rate adjusting valve (for example, a needle valve) 22, a flow meter 23, and a pressure gauge 24 so that the flow rate and pressure of the dilution water can be measured with the flow meter 23 and the pressure gauge 24. It has become. A first supply path 11 and a second supply path 13 are branched from the main supply path 10.

  In the first supply path 11, the first inlet 31 for injecting the hydrochloric acid aqueous solution supplied from the first supply device 12, the hydrochloric acid aqueous solution supplied from the first supply device 12 and the dilution water are mixed. A first mixing dilution section (reaction tank) 32 for dilution and a first flow rate adjustment valve (for example, a needle valve) 33 for adjusting the pressure of an aqueous hydrochloric acid solution (including dilution water) flowing through the first supply path 11 are provided. .

  The first mixed dilution section 32 has an inner diameter larger than the inner diameter of the first supply path 11, and a plate member (baffle plate) 34 having a plurality of through holes 34 a is provided in the middle. As a result, a flow resistance against the aqueous hydrochloric acid solution and the diluting water that has flowed into the first mixed diluting unit 32 is generated at a portion upstream of the plate member 34 of the first mixed diluting unit 32, so A region 35 (hereinafter referred to as “first reaction region”) is formed.

  Further, in the first mixing dilution section 32, a region (hereinafter referred to as “first”) for further uniformly diluting the hydrochloric acid aqueous solution and the diluted water diffused through the through hole 34 a of the plate member 34 in a portion downstream of the plate member 34. 36 ”is formed. The dilution water and the hydrochloric acid aqueous solution supplied to the first supply path 11 are mixed for a predetermined time in the first reaction region 35 by the flow resistance of the plate member 34, and pass through the through hole 34 a of the plate member 34. By diffusing into the region 36 and passing through the first stable region 36, the solution is uniformly diluted to form a hydrochloric acid aqueous solution diluted to a predetermined concentration.

  The first flow rate adjustment valve 33 is provided on the downstream side of the first mixing / dilution unit 32. By operating the first flow rate adjustment valve 33, the pressure in the first mixing / dilution unit 32 is adjusted, The flow rate of the aqueous hydrochloric acid diluted by the first mixing / dilution unit 32 or the dilution water before flowing into the first mixing / dilution unit 32 can be adjusted.

  A second inlet 41 for injecting a hypochlorite aqueous solution supplied from the second supply device 14 into the second supply path 13, and a hypochlorite aqueous solution and dilution supplied from the second supply device 14 A second flow dilution valve (reaction tank) 42 that mixes and dilutes water, and a second flow rate adjustment valve that adjusts the flow rate of a hypochlorite aqueous solution (including diluted water) flowing through the second supply path 13 ( For example, a needle valve) 43 is provided.

  Similar to the first mixing / dilution unit 32, the second mixing / dilution unit 42 has an inner diameter larger than the inner diameter of the second supply path 13, and has a plate member (baffle) having a plurality of through holes 44 a in the middle thereof. Plate) 44 is provided. As a result, a flow resistance against the hypochlorite aqueous solution and dilution water that has flowed into the second mixed dilution section 42 is generated in a portion upstream of the plate member 44 of the second mixed dilution section 42, and hydrochloric acid is generated. A region (hereinafter referred to as “second reaction region”) 45 in which the aqueous solution and the dilution water are mixed is formed.

  In addition, the second mixing and dilution unit 42 is a region in which the aqueous hydrochloric acid solution and the diluted water diffused through the through hole 44a of the plate member 44 are further uniformly diluted in the downstream portion of the plate member 44 (hereinafter referred to as “second”). 46) (referred to as “stable region”). The diluting water and the hydrochloric acid aqueous solution supplied to the second supply path 13 are mixed for a predetermined time in the second reaction region 45 by the flow resistance of the plate member 44, and pass through the through hole 44a of the plate member 44. By diffusing into the region 46 and passing through the second stable region 46, a hypochlorite aqueous solution having a predetermined concentration is diluted uniformly.

  The second flow rate adjustment valve 43 is provided on the downstream side of the second mixing dilution unit 42, and by operating the second flow rate adjustment valve 43, the internal pressure of the second mixing dilution unit 42 is adjusted, The flow rate of the hypochlorite aqueous solution diluted by the second mixing / dilution unit 42 or the flow rate of the diluted water before flowing into the second mixing / dilution unit 42 can be adjusted.

  A pressure gauge (hereinafter referred to as “first pressure gauge”) 51 is provided at a position upstream of the first inlet 31 of the first supply path 11, and more than the second inlet 41 of the second supply path 13. A pressure gauge (hereinafter referred to as “second pressure gauge”) 52 is provided at the upstream position. The weakly acidic chlorine water production apparatus 2 measures the pressure in the first supply path 11 with the first pressure gauge 51 and measures the pressure in the second supply path 13 with the second pressure gauge 52, thereby providing the first supply. The pressure difference between the path 11 and the second supply path 13 can be seen.

  The first supply device 12 includes a first storage tank 53 that stores an aqueous hydrochloric acid solution, and a first injection pump 54 that sends the aqueous hydrochloric acid solution stored in the first storage tank 53 to the first supply path 11. The second supply device 14 also sends a second storage tank 55 for storing a hypochlorite aqueous solution and a hypochlorite aqueous solution stored in the second storage tank 55 to the second supply path 13. Two infusion pumps 56 are provided. The third supply device 16 includes a third storage tank 57 that stores the pH adjusting agent, and a third injection pump 58 that sends the pH adjusting agent stored in the third storage tank 57 to the first supply path 11. . As the pH adjusting agent stored in the third storage tank 57, various types such as a hydrochloric acid aqueous solution and caustic soda are used. In this embodiment, an example in which a hydrochloric acid aqueous solution is used as the pH adjusting agent will be described.

  In the third supply path 15, a flow resistance is generated, and the hydrochloric acid aqueous solution diluted by the first mixing / dilution unit 32 and the hypochlorite aqueous solution diluted by the second mixing / dilution unit 42 are further mixed. A third mixed dilution unit 61 that generates weakly acidic chlorinated water having a predetermined pH by dilution, and a third flow rate adjustment valve that adjusts the flow rate of weakly acidic chlorinated water generated by the third mixed diluted unit 61 (for example, Needle valve) 62 is provided.

  The third mixing dilution section 61 has an inner diameter larger than the inner diameter of the third supply path 15, and a plate member 63 having a plurality of through holes 63 a formed in the middle thereof. As a result, a flow resistance against the hypochlorite aqueous solution and the diluted water that has flowed into the third mixed dilution section 61 is generated in a portion upstream of the plate member 63 of the third mixed dilution section 61, and hydrochloric acid is generated. A region (hereinafter referred to as “third reaction region”) 64 in which the aqueous solution and the dilution water are mixed is formed.

  The third mixing / dilution unit 61 further uniformly dilutes the aqueous hydrochloric acid solution and the diluting water diffused through the through hole 63a of the plate member 63 in the downstream portion of the plate member 63 (hereinafter referred to as “third”). 65) (referred to as “stable region”). The hydrochloric acid aqueous solution and the hypochlorite aqueous solution diluted to a predetermined concentration and supplied to the third supply path 15 are mixed in the third reaction region 64 for a predetermined time by the flow resistance of the plate member 63, and the through holes of the plate member 63 are mixed. By passing through 63a, it diffuses into the third stable region 65, and by passing through the third stable region 65, it becomes weakly acidic chlorinated water that is uniformly diluted and adjusted to a predetermined pH.

  The third flow rate adjustment valve 62 is provided on the downstream side of the third mixing / dilution unit 61. By operating the third flow rate adjustment valve 62, the pressure of the third mixing / dilution unit 61 is adjusted, It is possible to adjust the flow rate of the weakly acidic chlorinated water generated by the three-mixing / dilution unit 61.

  The internal pressures of the first mixing dilution unit 32, the second mixing dilution unit 42, and the third mixing dilution unit 61 are the first flow rate adjustment valve (pressure adjustment valve) 33 and the second flow rate adjustment valve (pressure adjustment valve) 43. By operating the third flow rate regulating valve (pressure regulating valve) 62, both are maintained at 0.2 Mpa or more.

  The control device 18 includes a controller (hereinafter referred to as “first controller”) 71 for controlling the first infusion pump 54 of the first supply device 12 and a controller (hereinafter referred to as “first” for controlling the second infusion pump 56 of the second supply device 14. 72), a controller (hereinafter referred to as “third controller”) 73 for controlling the third infusion pump 58 of the first supply device 12, and weakly acidic chlorine supplied from the second supply line 5 to the main supply path 10. A chlorine concentration indicator 74 that indicates the chlorine concentration of water, a pH indicator 75 that indicates the pH of weakly acidic chlorine water supplied from the second supply line 5 to the main supply path 10, and a main supply path from the second supply line 5 10 is provided with a temperature indicator 76 for indicating the temperature of the weakly acidic chlorinated water supplied to 10, a recorder 77, and the like.

  Further, a chlorine concentration sensor 80, a chlorine concentration meter, a pH sensor 81, a pH indicating controller, a temperature sensor 82, and the like are provided in a piping route branched from the main supply route 10, and the control device 18 uses these sensors. In addition, the chlorine concentration, pH, and temperature of weakly acidic chlorinated water supplied from the second supply line 5 to the main supply path 10 can be measured by a chlorine concentration meter and a pH indicating controller.

  The control device 18 indicates the chlorine concentration data measured by the chlorine concentration sensor 80 and transmitted by the chlorine concentration meter with the chlorine concentration indicator 74, measured by the pH sensor 81, and transmitted by the pH indicating controller. The pH data of the acidic chlorine water is indicated by the pH indicator 75, the temperature data measured by the temperature sensor 82 is indicated by the temperature indicator 76, and each data is recorded in the recorder 77. It has become.

  The control device 18 configured as described above produces weakly acidic chlorine water so that the weakly acidic chlorine water discharged from the sterilization tank 3 and supplied from the second supply line 5 is regenerated into weakly acidic chlorine water having a predetermined pH. The apparatus 2 is controlled. That is, the control device 18 measures the chlorine concentration in the weakly acidic chlorine water supplied from the second supply line 5 with the chlorine concentration sensor 80 and the chlorine concentration meter, and an amount of hypochlorous acid according to the concentration (proportional). In order to supply the aqueous acid salt solution to the second supply path 13, the second supply device 14 is controlled (concentration proportional control).

  Then, the control device 18 supplies the first supply device 11 with a hydrochloric acid solution in an amount (proportional) corresponding to the amount of the hypochlorite solution supplied from the second supply device 12. 12 is controlled. Furthermore, the control device 18 measures the pH of the weakly acidic chlorinated water discharged from the sterilization tank 3 with the pH sensor 81 and adjusts the weakly acidic chlorinated water to a predetermined pH when the pH has changed. Therefore, the third supply device 16 is controlled.

  More specifically, the control device 18 receives chlorine concentration data in weakly acidic chlorine water measured by a chlorine concentration sensor 80 provided on the main supply path 10 side with a concentration indicator, and based on this concentration data. Thus, the second controller 72 determines the amount of hypochlorite aqueous solution to be supplied to the second supply path 13. Further, the second controller 72 drives the second infusion pump 56 of the second supply device 14 to supply the determined predetermined amount of the hypochlorite aqueous solution to the second supply path 13.

  On the other hand, the first controller 71 receives data on the determined amount of the hypochlorite aqueous solution from the second controller 72, and based on this data, the amount of the aqueous hydrochloric acid solution to be supplied to the first supply path 11 To decide. The first controller 71 drives the first injection pump 54 of the first supply device 12 to supply the determined predetermined amount of aqueous hydrochloric acid solution to the first supply path 11.

  The third controller 73 of the control device 18 reads the pH value of the weakly acidic chlorinated water measured by the pH sensor with the third controller 73 via the pH indicator 75. For example, when the pH value is high. Determines the amount of pH adjuster required to adjust the weakly acidic chlorinated water to a predetermined pH. The third controller 73 drives the third infusion pump 58 of the third supply device 16 and supplies the determined predetermined amount of the pH adjusting agent to the first supply path 11. The aqueous hydrochloric acid solution sent by the third pump 58 is supplied to the first supply path 11 through the first inlet 31.

  As described above, the second supply device 12 supplies the second hypochlorite aqueous solution in an amount corresponding to the concentration of the hypochlorite aqueous solution in the weakly acidic chlorine water that is the dilution water supplied from the second supply line 5. The first supply device 12 is controlled to supply to the supply path 13, and supplies the hydrochloric acid aqueous solution in an amount corresponding to the amount of the hypochlorite aqueous solution supplied from the second supply device 14 to the first supply path 11. To be controlled.

  Hereinafter, a method for sterilizing an object to be sterilized using the weakly acidic chlorinated water circulation device 1 will be described.

  First, weakly acidic chlorinated water having a predetermined pH is stored in the sterilization tank 3 of the weakly acidic chlorinated water circulation device 1 and sterilized objects (for example, foods such as vegetables) are sequentially immersed in the weakly acidic chlorinated water. And sterilize. When the object to be sterilized is sequentially immersed in the weakly acidic chlorine water, the chlorine concentration of the weakly acidic chlorine water in the sterilization tank 3 decreases due to the organic matter and other components emitted from the object to be sterilized, and the pH value changes. Thus, the sterilizing power gradually decreases.

  At this time, the circulation pump 7 is operated to discharge weakly acidic chlorine water from the sterilization tank 3, and this weakly acidic chlorine water is supplied to the weakly acidic chlorine water production apparatus 2 through the second supply line 5. The weakly acidic chlorinated water supplied to the weakly acidic chlorinated water production apparatus 2 flows separately into the first supply path 11 and the second supply path 13 as diluted water of a hydrochloric acid aqueous solution and a hypochlorite aqueous solution.

  The control device 18 measures the chlorine concentration (the concentration of the hypochlorite aqueous solution) and the pH value of the weakly acidic chlorinated water through the chlorine concentration sensor 80 and the pH sensor 81 supplied to the weakly acidic chlorinated water production device 2. Then, a predetermined amount of hypochlorite aqueous solution is supplied from the second supply device 14 to the second supply path 13 by concentration proportional control. Then, the control device 18 supplies a hydrochloric acid aqueous solution corresponding to the amount of the hypochlorite aqueous solution from the first supply device 12 to the first supply path 11. Furthermore, the control device 18 adds an appropriate amount of pH adjuster (hydrochloric acid aqueous solution) based on the measured pH value so that the weakly acidic chlorine water produced by the weakly acidic chlorine water production device 2 has a predetermined pH. The third supply device 16 is supplied to the first supply path 11.

  The aqueous hydrochloric acid solution supplied to the first supply path 11 flows into the first mixing / dilution unit 32 together with the weakly acidic chlorine water that is the dilution water. Then, the hydrochloric acid aqueous solution and the dilution water are mixed in the first mixing / dilution unit 32 to generate a hydrochloric acid aqueous solution having a predetermined concentration that is uniformly diluted.

  The hypochlorite aqueous solution supplied to the second supply path 13 flows into the second mixed dilution section 42 together with the weakly acidic chlorine water that is the dilution water. Then, the hypochlorite aqueous solution and the diluting water are mixed in the second mixing / dilution unit 42 to produce a hypochlorite aqueous solution having a predetermined concentration that is uniformly diluted.

  The aqueous hydrochloric acid solution diluted in the first supply path 11 and the hypochlorite aqueous solution diluted in the second supply path 13 merge in the third supply path 15 and flow into the third mixing and dilution unit 61. The hypochlorite aqueous solution and the hydrochloric acid aqueous solution are mixed and uniformly diluted by the third mixing / dilution unit 61 to become weakly acidic chlorine water having a predetermined pH. This weakly acidic chlorinated water is supplied from the third supply path 15 to the sterilization tank 3 of the weakly acidic chlorinated water circulation device 1 through the first supply line 4.

  As described above, the weakly acidic chlorinated water circulating apparatus 1 can supply the weakly sterilized chlorine water having a high sterilizing power that is always adjusted to a predetermined pH to the sterilizing tank 3 by circulating the weakly acidic chlorinated water through the circulation line 6. Thus, the object to be sterilized can be sterilized reliably and quickly.

  According to the weakly acidic chlorinated water circulation device 1 having the above configuration, when weakly acidic chlorinated water having reduced sterilizing power is supplied from the sterilizing tank 3 to the weakly acidic chlorinated water production device 2 through the second supply line 5, The manufacturing apparatus 2 mixes the aqueous hydrochloric acid solution (weakly acidic chlorinated water) with the first mixing / dilution unit 32 of the first supply path 11 to uniformly dilute it, and the second mixing / dilution unit 42 of the second supply path 13 The hypochlorite aqueous solution and the weakly acidic chlorinated water (diluted water) are mixed and diluted uniformly, and the diluted hydrochloric acid aqueous solution and the hypochlorite aqueous solution are mixed into the third mixing / dilution unit 61 of the third supply path 15. The aqueous hydrochloric acid solution and the hypochlorite aqueous solution are diluted stepwise to become weakly acidic chlorinated water without unevenness.

  Therefore, the weakly acidic chlorinated water injected into the sterilization tank 3 is capable of suppressing generation of chlorine gas without causing the locally concentrated hypochlorite aqueous solution and the concentrated hydrochloric acid aqueous solution to contact each other. It has become. Thereby, the weakly acidic chlorinated water circulation apparatus 1 can always sterilize the sterilization target with the weakly acidic chlorinated water having a high sterilizing power.

  Further, in the weakly acidic chlorinated water production apparatus 2, a first pressure gauge 51 is provided in the first supply path 11 on the upstream side of the first inlet 31, and the first pressure gauge 51 is provided on the downstream side of the first mixing and dilution unit 32. 1, a second flow rate adjustment valve 33 is provided, a second pressure gauge 52 is provided upstream of the second inlet 41 of the second supply path 13, and a second flow rate is provided downstream of the second mixing and dilution unit 42. Since the adjustment valve 43 is provided, the pressure in the first supply path 11 and the second supply path 13 is adjusted by operating the first flow rate adjustment valve 33 and the second flow rate adjustment valve 43. It becomes possible to set a desired pressure environment. In particular, when the pressures of the first supply path 11 and the second supply path 13 are equalized and dilution water is evenly supplied to the first supply path 11 and the second supply path 13. Useful for.

  In addition, by providing a plate member (baffle plate) 34 in the middle of the first mixing / dilution unit 32, a flow resistance (pressure resistance) is generated in the first reaction region 35 on the upstream side of the plate member 34. The aqueous hydrochloric acid solution and the diluting water that have flowed into the reaction region 35 are mixed for a certain period of time, and further, these are passed through the through-holes 34a of the plate member 34 and diffused into the first stable region 36. Will be diluted evenly.

  Similarly, by providing a plate member (baffle plate) 44 in the middle of the second mixing and dilution unit 42, a flow resistance (pressure resistance) is generated in the second reaction region 45 on the upstream side of the plate member 44, By mixing the hypochlorite aqueous solution and dilution water that have flowed into the second reaction region 45 for a certain period of time, and further passing these through the through holes 44a of the plate member 44 and diffusing them into the second stable region 46, The hypochlorite aqueous solution is diluted uniformly without unevenness.

  Similarly, by providing a plate member (baffle plate) 63 in the middle of the third mixing and dilution unit 61, a flow resistance is generated in the third reaction region 64 on the upstream side of the plate member 63, and the third reaction region The aqueous hydrochloric acid solution and the hypochlorite aqueous solution flowing into 64 are mixed for a certain period of time, and further, these are passed through the through-hole 63a of the plate member 63 and diffused into the third stable region 65, so The aqueous chlorite solution is evenly diluted without unevenness, and weakly acidic chlorinated water that hardly generates chlorine gas is generated.

  Further, the weakly acidic chlorinated water circulation device 1 is configured such that the second supply device 14 of the weakly acidic chlorinated water production device 2 is a solution of hypochlorite aqueous solution in weakly acidic chlorinated water that is dilution water supplied from the second supply line 5. The amount of the hypochlorite aqueous solution that is controlled so as to supply the hypochlorite aqueous solution in an amount corresponding to the concentration to the second supply path 13 and the first supply device 12 is supplied from the second supply device 14. Therefore, the weakly acidic chlorinated water produced thereby can be maintained at a desired concentration and always at a desired pH value. become.

  Moreover, while measuring the pH of the weak acidic chlorine water discharged | emitted from the sterilization tank 3 and supplied to the weak acidic chlorine water manufacturing apparatus 2 from the 2nd supply line 5, according to this pH value, the 3rd supply apparatus 16 By supplying the pH adjuster, the weak acid chlorine water produced by the weak acid chlorine water production apparatus 2 has a desired concentration and a desired pH.

  A weakly acidic chlorinated water of pH 6 and 7 (hereinafter referred to as “Example”) produced using the weakly acidic chlorinated water production apparatus 2 and an aqueous hydrochloric acid solution and hypochlorite without using the weakly acidic chlorinated water producing apparatus 2 A comparative test of the generated chlorine concentration of weakly acidic chlorinated water (hereinafter referred to as “Comparative Example”) generated by mixing an aqueous solution with diluted water was conducted. In this test, 100 cc of weakly acidic chlorinated water was placed in a beaker and sealed in an airtight sealed container (bag), and the chlorine gas concentration in the sealed container was measured after standing for 1 minute. Measured with a chlorine detector tube. For the production of weakly acidic chlorinated water, tap water having a chlorine concentration of 150 ppm was used as dilution water.

  The test results are shown in FIG. As shown in FIG. 3, in the case of pH 6 and 7, the concentration of the chlorine gas generated in the example is lower than that in the comparative example. Therefore, the weak acid chlorine water produced by the weak acid chlorine water production apparatus 2 is It can be seen that the generation of chlorine gas can be suppressed. In FIG. 3, pH 9 chlorine water produced without using a hydrochloric acid aqueous solution is also shown as a reference example.

  Weakly acidic chlorinated water was produced by changing the internal pressure of the third mixing and dilution unit 61 of the weakly acidic chlorinated water production apparatus 2, and the generated chlorine concentration of the weakly acidic chlorinated water at each pressure was measured. The measurement results are shown in FIG. FIG. 4 shows the relationship between the internal pressure of the third mixed dilution section 61 and the concentration of the generated chlorine gas when weakly acidic chlorine water having pH 6 and 7 is produced. In addition, 150 ppm tap water was used as dilution water for weak acidic chlorine water manufacture. As shown in FIG. 4, it can be seen that, in both cases of pH 6 and 7, when the internal pressure of the third mixing dilution section 61 is 0.2 MPa or more, the concentration of generated chlorine gas can be suppressed low.

  A weakly acidic chlorinated water (Example) manufactured using the weakly acidic chlorinated water manufacturing apparatus 2 and a hydrochloric acid aqueous solution and a hypochlorite aqueous solution diluted with dilution water without using the weakly acidic chlorinated water manufacturing apparatus 2 The generated weakly acidic chlorinated water (comparative example) was compared by performing a bubbling test. In this test, tap water having a chlorine concentration of 150 ppm was used as dilution water. In the bubbling test, the concentration of chlorine gas generated from the example and the comparative example was measured when the comparative example was placed in a separate container and air was injected into the container for a certain period of time. The test results are shown in FIG. FIG. 5 compares the concentration (ppm) of chlorine gas generated from the examples and comparative examples when the pH of the weakly acidic chlorinated water is 6.0, 6.5, and 7.0. In FIG. 5, pH 9 chlorine water produced without using a hydrochloric acid aqueous solution is also shown as a reference example.

  As shown in FIG. 5, in the range of pH 6 to 7, the example has a lower chlorine gas concentration than the comparative example, and thus the weak acid chlorine water produced by the weak acid chlorine water production apparatus 2 is It can be seen that generation of chlorine gas can be suppressed.

A weak acidic chlorinated water having a different pH was produced using the weak acidic chlorinated water production apparatus 2, and a test was conducted to confirm the bactericidal effect on the weakly acidic chlorinated water of each pH against Escherichia coli (JM109). The test results are shown in FIG. FIG. 6 shows the production of weakly acidic chlorine water having a pH value of 6, 6.5, 7, and 9 by the weakly acidic chlorine water production apparatus 2 and injecting it into a culture solution of about 1 × 10 ⁷ cfu / ml of E. coli. The number of bacteria is shown. In FIG. 6, pH 9 chlorine water produced without using a hydrochloric acid aqueous solution is also shown as a reference example. In FIG. 6, it means that the germicidal effect of weakly acidic chlorinated water is higher as the number of E. coli bacteria decreases.

  As shown in FIG. 6, it can be seen that weakly acidic chlorinated water can reduce the number of Escherichia coli by its bactericidal action in the range of pH 6-7. It can be seen that the weakly acidic chlorinated water in the range of pH 6 to 6.5 has a higher sterilizing effect, and the weakly acidic chlorinated water of pH 6 has the highest sterilizing effect.

The weak acidic chlorinated water production apparatus 2 was used to produce weak acidic chlorinated water having different pHs, and a test was conducted to confirm the bactericidal effect against Staphylococcus epidermidis at each pH. The test results are shown in FIG. FIG. 7 shows the number of cells when weakly acidic chlorinated water having pH values of 6, 6.5, and 7 is produced and injected into a culture solution of Staphylococcus epidermidis at about 1 × 10 ⁶ cfu / ml. is there. In FIG. 7, chlorine water produced without using a hydrochloric acid aqueous solution is also shown as a reference example. In FIG. 7, the smaller the number of Staphylococcus epidermidis, the higher the bactericidal effect of weakly acidic chlorinated water. As shown in FIG. 7, it can be seen that weakly acidic chlorinated water having a pH value in the range of 6 to 7 has a high bactericidal effect against Staphylococcus epidermidis.

A weak acidic chlorinated water having different pHs was produced using the weak acidic chlorinated water production apparatus 2, and a test was conducted to confirm the bactericidal effect on the Bacillus cereus (spore fungus) at each pH. The test results are shown in FIG. FIG. 8 shows the production of weakly acidic chlorinated water having pH values of 6.0, 6.5, and 7.0 by the weakly acidic chlorinated water production apparatus 2, and the resulting culture solution of Bacillus cereus is about 1 × 10 ^6.1 cfu / ml. The number of bacteria is shown when 1 minute has passed (1 minute treatment), 3 minutes have passed (3 minutes treatment), and 5 minutes have passed (5 minutes treatment). In FIG. 8, pH 8.1 and 9.0 chlorine water produced without using an aqueous hydrochloric acid solution is also shown as a reference example. In FIG. 8, the smaller the number of Bacillus cereus bacteria, the higher the bactericidal effect of weakly acidic chlorinated water.

  As shown in FIG. 8, it can be seen that weakly acidic chlorinated water can sterilize Bacillus cereus when a treatment time of 1 minute or longer is applied in the range of pH 6.0 to 7.0. Further, the weakly acidic chlorinated water has a higher bactericidal effect in the range of pH 6.0 to 6.5, and further has a higher bactericidal effect in the range of pH 6.0 to 6.5. Is high.

  In addition, this invention is not restricted to said embodiment, A various change and deformation | transformation are possible.

  For example, in the weakly acidic chlorinated water production apparatus 2 illustrated in the above embodiment, the first pressure gauge 51 is provided in the first supply path 11 and the second pressure gauge 52 is provided in the second supply path 13. However, not limited to this, a differential pressure gauge is provided between a position upstream of the first inlet 31 of the first supply path 11 and a position upstream of the second inlet 41 of the second supply path 13, You may make it operate the 1st flow regulating valve 33 and the 2nd flow regulating valve 43 based on the pressure difference measured with this differential pressure gauge.

  In the above embodiment, an example in which the weakly acidic chlorinated water produced by the weakly acidic chlorinated water production apparatus 2 is supplied to the sterilization tank 3 has been described. Water (for example, tap water) may be injected, and this diluted water may be sent to the weakly acidic chlorinated water production apparatus 2 to produce weakly acidic chlorinated water having a predetermined pH, and the circulation line 6 may be circulated.

  In the above embodiment, the weakly acidic chlorine water in which the first flow rate adjustment valve 33 is provided on the downstream side of the first mixing dilution unit 32 and the second flow rate adjustment valve 43 is provided on the downstream side of the second mixing dilution unit 42. Although the manufacturing apparatus 2 has been illustrated, the present invention is not limited thereto, and the first flow rate adjustment valve 33 is provided on the upstream side of the first mixing / dilution unit 32, and the second flow rate adjustment valve 43 is provided on the upstream side of the second mixing / dilution unit 42. Then, the flow rate of the dilution water may be adjusted.

It is a flow figure showing one embodiment of the weak acid chlorine water circulation device concerning the present invention. It is a principal part enlarged view of the weak acidic chlorine water manufacturing apparatus. It is a graph which shows the density | concentration of the chlorine gas which generate | occur | produced from the weak acidic chlorine water manufactured with the weak acidic chlorine water manufacturing apparatus, and the weak acidic chlorine water produced | generated without using a weak acidic chlorine water manufacturing apparatus. It is a graph which shows the density | concentration of the chlorine gas generate | occur | produced from each weakly acidic chlorine water when changing the internal pressure of the 3rd mixing dilution part of a weakly acidic chlorine water manufacturing apparatus and manufacturing weakly acidic chlorine water. It is a graph which shows the result of a bubbling test. It is a graph which shows the bactericidal action with respect to colon_bacillus | E._coli of the weak acid chlorine water manufactured with the weak acid chlorine water manufacturing apparatus. It is a graph which shows the bactericidal action with respect to Staphylococcus epidermidis produced with the weak acid chlorine water manufacturing apparatus. It is a graph which shows the bactericidal action with respect to the spore bacteria of the weak acid chlorine water manufactured with the weak acid chlorine water manufacturing apparatus. It is a graph which shows the abundance ratio (abundance ratio) of weakly acidic chlorine water free chlorine with respect to the hydrogen ion index.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Weakly acidic chlorine water circulation apparatus, 2 ... Weakly acidic chlorine water manufacturing apparatus, 3 ... Sterilization tank, 4 ... 1st supply line, 5 ... 2nd supply line, 6 ... Circulation line, 7 ... Circulation pump, 10 ... Main supply Path, 11 ... first supply path, 12 ... first supply apparatus, 13 ... second supply path, 14 ... second supply apparatus, 15 ... third supply path, 16 ... third supply apparatus, 31 ... first inlet 32 ... 1st mixing dilution part, 33 ... 1st flow adjustment valve, 34 ... Plate member, 41 ... 2nd inlet, 42 ... 2nd mixing dilution part, 43 ... 2nd flow adjustment valve, 44 ... Plate member, DESCRIPTION OF SYMBOLS 51 ... 1st pressure gauge, 52 ... 2nd pressure gauge, 61 ... 3rd mixing dilution part, 62 ... 3rd flow regulating valve, 63 ... Plate member

Claims (5)

A weakly acidic chlorinated water production device that produces weakly acidic chlorinated water having a predetermined hydrogen ion index, and a sterilizer that stores weakly acidic chlorinated water produced by this weakly acidic chlorinated water producing device and sterilizes a predetermined sterilization target A tank, a first supply line that supplies weakly acidic chlorine water produced by the weakly acidic chlorine water production apparatus to the sterilization tank, and a first supply line that supplies weakly acidic chlorine water discharged from the sterilization tank to the weakly acidic chlorine water production apparatus. A circulation line for circulating weakly acidic chlorinated water by two supply lines, and a weakly acidic chlorinated water circulation device provided with a circulation pump for circulating the weakly acidic chlorinated water in the circulating line,
The weakly acidic chlorinated water discharged from the sterilization tank is supplied to the weakly acidic chlorinated water production device and used as dilution water to dilute the hydrochloric acid aqueous solution and hypochlorite aqueous solution used in this weakly acidic chlorinated water production device. Is possible,
The weakly acidic chlorinated water production apparatus includes a first supply path for supplying a dilution water for diluting a hydrochloric acid aqueous solution, a supply apparatus for supplying the hydrochloric acid aqueous solution to the first supply path, and a dilution water for diluting the hypochlorite aqueous solution. The first supply path is diluted with the second supply path, the supply device supplying the hypochlorite aqueous solution to the second supply path, and the first supply path and the second supply path are merged. A third supply path for supplying weakly acidic chlorine water having a predetermined hydrogen ion index by mixing and diluting the aqueous hydrochloric acid solution and the hypochlorite aqueous solution diluted in the second supply path,
The first supply path has a first inlet for injecting a hydrochloric acid aqueous solution supplied from a hydrochloric acid aqueous solution supply device and a downstream side of the first inlet, and generates a flow resistance from the first inlet. A first mixed dilution section for mixing and diluting the injected hydrochloric acid aqueous solution with dilution water,
The first mixing / dilution unit includes a plate member having a plurality of through holes formed therein, and creates a flow resistance on the upstream side of the plate member to mix the hydrochloric acid aqueous solution and the dilution water, and the hydrochloric acid aqueous solution together with the dilution water. By passing through the through hole of the plate member, this aqueous hydrochloric acid solution is configured to be diluted to a predetermined concentration,
The second supply path has a second inlet for injecting a hypochlorite aqueous solution supplied from a hypochlorite aqueous solution supply device, a downstream side of the second inlet, and a flow resistance. A second mixed dilution section for mixing and diluting the hypochlorite aqueous solution generated and injected from the second inlet with dilution water is provided,
The second mixing / dilution unit includes a plate member having a plurality of through holes formed therein, and generates a flow resistance on the upstream side of the plate member to mix the hypochlorite aqueous solution and the dilution water. By passing the chlorate aqueous solution together with the dilution water through the through hole of the plate member, the hypochlorite aqueous solution can be diluted to a predetermined concentration,
In the third supply path, a flow resistance is generated, and the aqueous hydrochloric acid solution diluted in the first mixed dilution unit and the hypochlorite aqueous solution diluted in the second mixed dilution unit are mixed and diluted. , A third mixed dilution unit for generating weakly acidic chlorinated water having a predetermined hydrogen ion index is provided ,
The third mixing dilution section includes a plate member having a plurality of through holes formed therein, and a hydrochloric acid aqueous solution diluted in the first mixing dilution section and a hypochlorite aqueous solution diluted in the second mixing dilution section. And a mixture of hypochlorite aqueous solution and hydrochloric acid aqueous solution passing through the through-hole of the plate member, thereby generating a flow resistance at the upstream side of the plate member. It is configured to produce weakly acidic chlorinated water,
Further, the first supply path is provided at a position upstream of the first inlet, and adjusts the flow rate of the dilution water flowing through the first supply path, and a first pressure gauge that measures the pressure in the first supply path. A second pressure gauge provided at a position upstream of the second inlet and measuring the pressure in the second supply path; and a first supply path. weakly acidic chlorine water circulation apparatus according to claim Rukoto and a second flow regulating valve for regulating the flow rate of the dilution water flowing. First supply path, weakly acidic chlorine water circulation apparatus according to claim 1, downstream of the first mixing dilution portion and a first flow rate regulation valve. The weakly acidic chlorinated water circulation device according to claim 1 or 2 , wherein the second supply path includes a second flow rate adjusting valve on the downstream side of the second mixing and dilution unit. The weakly acidic chlorinated water circulation device according to any one of claims 1 to 3 , wherein the third supply path includes a third flow rate adjusting valve on the downstream side of the third mixing and dilution unit. The apparatus for supplying a hypochlorite aqueous solution is configured to supply a hypochlorite aqueous solution in an amount corresponding to the chlorine concentration in the weakly acidic chlorinated water that is dilution water supplied from the second supply line to the second supply path. The aqueous hydrochloric acid solution supply device is controlled to supply an aqueous hydrochloric acid solution in an amount corresponding to the amount of the hypochlorite aqueous solution supplied from the hypochlorite aqueous solution supply device to the first supply path. The weakly acidic chlorinated water circulation device according to any one of claims 1 to 4 .

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