JP5307351B2 - Weakly acidic chlorine water production equipment - Google Patents

Description

  The present invention relates to a weakly acidic chlorinated water production apparatus for producing weakly acidic chlorinated water used for sterilization of foods, for example.

  For example, a hypochlorite aqueous solution such as a sodium hypochlorite aqueous solution 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 chlorate ions increases (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 this pH is too low. (For example, when the pH is 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. In order to adjust pH by mixing aqueous hydrochloric acid solution with hypochlorite aqueous solution, a method of mixing hypochlorite aqueous solution and aqueous hydrochloric acid solution in a supply path for supplying dilution water, and mixing and diluting with a static mixer. It is common. By doing in this way, the weak acidic chlorine water with the high bactericidal effect adjusted to predetermined | prescribed pH is produced | generated.

  However, when hypochlorite aqueous solution and hydrochloric acid aqueous solution are injected into the dilution water supply path and mixed and diluted, the locally concentrated hypochlorite aqueous solution and the concentrated hydrochloric acid aqueous solution come into contact with each other. As a result, toxic chlorine gas may be generated.

  The present invention has been made in view of the above circumstances, and is capable of producing weakly acidic chlorine water that suppresses generation of chlorine gas by diluting a hypochlorite aqueous solution and a hydrochloric acid aqueous solution stepwise. It is an object to provide a chlorine water production apparatus.

  The present invention has been made to solve the above-described problems, and includes a first supply path for supplying dilution water for diluting a hydrochloric acid aqueous solution, a supply device for supplying a hydrochloric acid aqueous solution to the first supply path, and hypochlorous acid. A second supply path for supplying dilution water for diluting the salt aqueous solution, a supply device for supplying a hypochlorite aqueous solution to the second supply path, a first supply path and a second supply path, Third supply for supplying weakly acidic chlorine water having a predetermined hydrogen ion index by mixing and diluting a hydrochloric acid aqueous solution diluted in one supply route and a hypochlorite aqueous solution diluted in a second supply route A weakly acidic chlorinated water production apparatus comprising: a first inlet for injecting a hydrochloric acid aqueous solution supplied from a hydrochloric acid aqueous solution supply device to the first supply path; and a downstream side of the first inlet. And the flow resistance is generated A first mixing / dilution unit for mixing and diluting the hydrochloric acid aqueous solution injected from the inlet with dilution water is provided, and a hypochlorous acid aqueous solution supplied from a hypochlorite aqueous solution supply device is provided in the second supply path. A second inlet for injecting a chlorate aqueous solution, and a hypochlorite aqueous solution injected from the second inlet with a flow resistance, located downstream of the second inlet and mixed with dilution water And a second mixed dilution section for dilution. The flow rate resistance is generated in the third supply path to dilute the hydrochloric acid aqueous solution diluted in the first mixed dilution section and the second mixed dilution section. In addition, a third mixed dilution section is provided that mixes the hypochlorite aqueous solution with the aqueous solution to generate weakly acidic chlorinated water having a predetermined hydrogen ion index.

  According to such a configuration, the aqueous hydrochloric acid solution can be uniformly diluted to a predetermined concentration by generating a flow resistance at the first mixing / dilution section of the first supply path and mixing the aqueous hydrochloric acid solution and the dilution water. In addition, the hypochlorite aqueous solution can be uniformly diluted to a predetermined concentration by generating a flow resistance in the second mixing and dilution part of the second supply path and mixing the hypochlorite aqueous solution and the dilution water. . Then, the hydrochloric acid aqueous solution and the hypochlorite aqueous solution thus uniformly diluted are mixed with each other by generating flow resistance at the third mixing dilution section of the third supply path, so that the hydrochloric acid aqueous solution and the hypochlorous acid are mixed. The aqueous salt solution is further mixed and diluted uniformly, whereby weakly acidic chlorinated water having a predetermined pH is generated. In this way, the hydrochloric acid aqueous solution and the hypochlorite aqueous solution are diluted in the first mixed dilution section and the second mixed dilution section, and the diluted hydrochloric acid aqueous solution and hypochlorite aqueous solution are further mixed in the third mixed dilution. By mixing and diluting in stages, the highly concentrated hypochlorite aqueous solution and the highly concentrated hydrochloric acid aqueous solution do not come into contact with each other. Weakly acidic chlorinated water suppresses the generation of chlorine gas. It will be possible.

  In the weakly acidic chlorinated water production apparatus according to the present invention, the first supply path and the second supply path are branched from the main supply path for supplying dilution water, and are more than the first inlet in the first supply path. A differential pressure gauge is provided between the upstream position and a position upstream of the second inlet in the second supply path, and the flow rate of dilution water in the first supply path is adjusted in the first supply path. A first flow rate adjusting valve is provided, and a configuration in which a second flow rate adjusting valve for adjusting the flow rate of the dilution water in the second supply route is provided in the second supply route can be adopted.

  According to this configuration, when there is a difference in the flow rate of the dilution water flowing through the first supply path and the second supply path branched from the main supply path, the pressure difference between the first supply path and the second supply path is determined by the differential pressure gauge. By operating the first flow rate adjustment valve and the second flow rate adjustment valve accordingly, for example, the flow rate of the dilution water flowing through the first supply path and the second supply device can be made equal. become.

  In the weakly acidic chlorinated water production apparatus according to the present invention, the first mixing and dilution unit includes a plate member in which a plurality of through-holes are formed, and causes flow resistance on the upstream side of the plate member to generate hydrochloric acid. The aqueous solution and the dilution water are mixed, and the hydrochloric acid aqueous solution is passed through the through-hole of the plate member together with the dilution water so that the hydrochloric acid aqueous solution can be diluted to a predetermined concentration. A configuration in which a first flow rate adjusting valve is provided on the downstream side of the mixing dilution section 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 chlorine water production apparatus according to the present invention, the second mixed dilution section includes a plate member in which a plurality of through holes are formed, and generates a flow resistance on the upstream side of the plate member. It is configured so that the hypochlorite aqueous solution can be diluted to a predetermined concentration by mixing the aqueous chlorite solution and the dilution water, and passing the hypochlorite aqueous solution together with the dilution water through the through hole of the plate member. Therefore, the second supply path may be provided with a second flow rate adjustment valve on the downstream side of the second mixing / dilution unit.

  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, in the weakly acidic chlorine water production apparatus according to the present invention, the third mixed dilution section is provided with a plate member having a plurality of through holes, and the third mixed dilution section has a flow resistance on the upstream side of the plate member. The aqueous hydrochloric acid solution and the hypochlorite aqueous solution are mixed, and the hypochlorite aqueous solution is passed through the through-holes of the plate member together with the aqueous hydrochloric acid solution. The third supply path may be provided with a third flow rate adjustment valve on the downstream side of the third mixing / dilution unit.

  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 are diffused through the through-holes of the plate member, whereby uniformly mixed weakly acidic chloric water without unevenness can be generated.

  Further, the weakly acidic chlorinated water production apparatus according to the present invention is such that the hypochlorite aqueous solution supply device supplies a hypochlorite aqueous solution in an amount corresponding to the flow rate of the dilution water to the first supply path. And the supply device for the aqueous hydrochloric acid solution is controlled so as to supply the aqueous hydrochloric acid solution in an amount corresponding to the amount of the hypochlorite aqueous solution supplied from the supply device for the hypochlorite aqueous solution to the second supply path. Can be adopted.

  According to this configuration, the hypochlorite aqueous solution in an amount corresponding to the flow rate of the dilution water is injected into the first supply path, and the hydrochloric acid aqueous solution in an amount corresponding to the amount of the hypochlorite aqueous solution is injected into the second supply path. By injecting into the aqueous solution, weakly acidic chlorinated water having a desired pH can be generated.

  According to the present invention, the weakly acidic chlorinated water in which generation of chlorine gas is suppressed by diluting the hypochlorite aqueous solution and the hydrochloric acid aqueous solution in stages in the first supply path, the second supply path, and the third supply path. Can be manufactured.

  Hereinafter, an embodiment of a weakly acidic chlorinated water production apparatus according to the present invention will be described with reference to the drawings.

  The weakly acidic chlorinated water production apparatus 1 shown in FIGS. 1 and 2 dilutes a hypochlorite aqueous solution and a hydrochloric acid aqueous solution with a dilution water, and mixes and dilutes the diluted hypochlorite aqueous solution and the hydrochloric acid aqueous solution. A weakly acidic chlorinated water having a predetermined pH is produced. In this embodiment, a sodium hypochlorite aqueous solution having a predetermined concentration is used as 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” refers to a range of pH 5 to 7 (pH 7 is strictly speaking neutral, but here treated as “weakly acidic”).

  The weakly acidic chlorinated water production apparatus 1 includes a main supply path 2 for supplying dilution water, a first supply path 3 for supplying dilution water for diluting hydrochloric acid aqueous solution, and a supply for supplying hydrochloric acid aqueous solution to the first supply path 3 A device (hereinafter referred to as “first supply device”) 4, a second supply path 5 for supplying dilution water for diluting the hypochlorite aqueous solution, and supplying a hypochlorite aqueous solution to the second supply path 5 A supply device (hereinafter referred to as a “second supply device”) 6, a first supply path 3 and a second supply path 5, and a hydrochloric acid solution diluted in the first supply path 3 and the second supply path 5. A third supply path 7, a first supply device 4, and a second supply device 6 that generate weakly acidic chlorinated water having a predetermined hydrogen ion index by mixing and diluting the diluted hypochlorite aqueous solution. A control device 8 or the like is provided.

  The main supply path 2 is provided with a water supply pump 21, a flow rate adjusting valve (for example, a needle valve) 22, a flow meter 23, and a pressure gauge 24, and dilution water is supplied downstream of the main supply path 2 by the water supply pump 21. The flow rate and pressure of the dilution water can be measured with a flow meter 23 and a pressure meter 24. A first supply path 3 and a second supply path 5 are branched from the main supply path 2.

  In the first supply path 3, a first inlet 31 for injecting a hydrochloric acid aqueous solution supplied from the first supply device 4 and a hydrochloric acid aqueous solution supplied from the first supply device 4 are mixed with dilution water for dilution. And a first flow rate adjustment valve (for example, a needle valve) 33 that adjusts the flow rate of the aqueous hydrochloric acid solution (including dilution water) flowing through the first supply path 3.

  The first mixing dilution section 32 has an inner diameter larger than the inner diameter of the first supply path 3, 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, and the aqueous hydrochloric acid solution and the diluting water are generated. A region 35 (hereinafter referred to as “first reaction region”) is formed.

  The first mixing / dilution unit 32 further uniformly dilutes the hydrochloric acid aqueous solution and the diluting water diffused through the through hole 34a of the plate member 34 in a portion downstream of the plate member 34 (hereinafter referred to as “first”). 36) is formed. The dilution water and the hydrochloric acid aqueous solution supplied to the first supply path 3 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.

  In the second supply path 5, a second inlet 41 for injecting a hypochlorite aqueous solution supplied from the second supply device 6, and a hypochlorite aqueous solution and dilution supplied from the second supply device 6 A second flow dilution valve (reaction tank) 42 for mixing and diluting water, and a second flow rate adjusting valve (for adjusting the flow rate of the hypochlorite aqueous solution (including diluted water) flowing through the second supply device 6) For example, a needle valve) 43 is provided.

  Similarly 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 5, and a plate member having a plurality of through-holes 44 a in the middle thereof (disturbance) 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.

  The second mixing / dilution section 42 is a region where the aqueous hydrochloric acid solution and the diluting water diffused through the through hole 44a of the plate member 44 are mixed more uniformly in the downstream portion of the plate member 44 (hereinafter referred to as “second”). 46) (referred to as “stable region”). The diluting water and hydrochloric acid aqueous solution supplied to the second supply path 5 are mixed in the second reaction region 45 for a predetermined time 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 that has been uniformly diluted to a predetermined concentration is obtained.

  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 differential pressure gauge 51 is provided between the first supply path 3 and the second supply path 5. The differential pressure gauge 51 is provided between a position upstream of the first inlet 31 of the first supply path 3 and a position upstream of the second inlet 41 of the second supply path 5. The pressure difference of the dilution water flowing through this position is measured.

  The first supply device 4 includes a first storage tank 55 that stores a hydrochloric acid aqueous solution, and a first injection pump 56 that sends the hydrochloric acid aqueous solution stored in the first storage tank 55 to the first supply path 3. The second supply device 6 also includes a second storage tank 58 that stores the hypochlorite aqueous solution, and a second storage tank 58 that sends the hypochlorite aqueous solution stored in the second storage tank 58 to the second supply path 5. Two infusion pumps 59 are provided.

  In the third supply path 7, flow resistance is generated, and the hydrochloric acid aqueous solution diluted in the first mixing / dilution unit 32 and the hypochlorite aqueous solution diluted in the second mixing / dilution unit 42 are mixed and diluted. 3rd dilution part 61 which generates weak acidic chlorine water of predetermined pH, and the 3rd flow control valve (for example, needle) which adjusts the flow volume of weak acidic chlorine water generated by the 3rd mixed dilution part 61 Valve) 62 is provided.

  The inner diameter of the third mixing / dilution unit 61 is larger than the inner diameter of the third supply path 7, 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 7 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 8 includes a controller (hereinafter referred to as “first controller”) 71 that controls the first infusion pump 56 of the first supply device 4 and a controller (hereinafter referred to as “the first controller” hereinafter) that controls the second infusion pump 59 of the second supply device 6. 72, a flow indicator 73 that takes in data of the flow meter 23 of the main supply path 2 and transmits the value to the second controller 72, and weakly acidic chlorine supplied from the third supply path 7 A temperature indicator 74 that displays the temperature of water, a pH indicator controller 75 that displays the pH of weakly acidic chlorine water, a chlorine concentration indicator 76 that displays the chlorine concentration of weakly acidic chlorine water, a recorder 77, and the like are provided. .

  The control device 8 controls the first supply device 4 and the second supply device 6 to produce weakly acidic chlorinated water having a predetermined pH set in advance. That is, the control device 8 determines the amount of the aqueous hydrochloric acid solution to be supplied to the first supply path 3 and the amount of the hypochlorite aqueous solution to be supplied to the second supply path 5 by flow rate proportional control. Specifically, the control device 8 reads the flow rate data of the dilution water measured by the flow meter 23 with the flow rate indicator 73, and the second controller 72 is based on the flow rate data sent from the flow rate indicator 73. The amount of hypochlorite aqueous solution to be supplied to the first supply path 3 in proportion to the flow rate data is determined. Then, the second controller 72 operates the second injection pump 59 of the second supply device 6 to send the determined amount of hypochlorite aqueous solution to the second supply path 5.

  Then, the first controller 71 determines the amount of the hydrochloric acid aqueous solution to be supplied to the first supply path 3 according to the amount of the hypochlorite aqueous solution determined by the second controller 72. The amount of the hydrochloric acid aqueous solution is proportional to the amount of the hypochlorite aqueous solution. Furthermore, the first controller 71 operates the first injection pump 56 of the first supply device 4 to send the determined amount of aqueous hydrochloric acid solution to the second supply path 5. As described above, the second supply device 6 is controlled to supply a hypochlorite aqueous solution in an amount corresponding to the flow rate of the dilution water measured by the flow meter 23, and the first supply device 4 Control is performed to supply an aqueous hydrochloric acid solution in an amount corresponding to the amount of the hypochlorite aqueous solution supplied from the device 6.

  A temperature sensor 80, a pH sensor 81, and a chlorine concentration sensor 82 are provided on the downstream side of the third mixing and dilution unit 61 in the third supply path 7, and the temperature indicator 74 of the control device 8 is controlled by the temperature sensor 80. The measured temperature data is indicated, the pH indicating controller 75 indicates the pH value of the weakly acidic chlorinated water measured by the pH sensor 81, and the chlorine concentration indicator 76 is the weakly measured by the chlorine concentration sensor 82. The chlorine concentration of acidic chlorine water is indicated. The recorder 77 records values indicated by the temperature indicator 74, the pH indicator controller 75, and the chlorine concentration indicator 76.

  Hereinafter, a method for producing weakly acidic chlorine water using the weakly acidic chlorine water production apparatus 1 will be described.

  The weakly acidic chlorinated water manufacturing apparatus 1 supplies dilution water from the main supply path 2 to the first supply path 3 and the second supply path 5 by operating the water supply pump 21. The dilution water flowing through the main supply path 2 is branched (branched) into the first supply path 3 and the second supply path 5 and flows through the respective supply paths.

  The second supply device 6 is controlled by the control device 8 to supply a necessary hypochlorite aqueous solution to the second supply path 5 via the second inlet 41. The first supply device 4 is controlled by the control device 8 to supply a first aqueous solution of hydrochloric acid corresponding to the amount of hypochlorite aqueous solution supplied from the second supply device 6 through the first inlet 31. Supply to path 3.

  The aqueous hydrochloric acid solution supplied to the first supply path 3 flows into the first mixing / dilution unit 32 together with 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 5 flows into the second mixing dilution section 42 together with 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 3 and the hypochlorite aqueous solution diluted in the second supply path 5 merge in the third supply path 7 and flow into the third mixing and dilution unit 61. The hypochlorite aqueous solution and the hydrochloric acid aqueous solution are uniformly mixed and diluted by the third mixing and dilution unit 61 to become weakly acidic chlorinated water having a predetermined pH. The weakly acidic chlorinated water is supplied from the third supply path 7 to a supply target such as a washing tank for food, for example.

  According to the weakly acidic chlorinated water production apparatus 1 having the above configuration, the hydrochloric acid aqueous solution and the dilution water are mixed and uniformly diluted by the first mixing and dilution unit 32 of the first supply path 3, and the second supply path 5 The hypochlorite aqueous solution and the diluting water are mixed and uniformly diluted by the mixing and diluting unit 42, and the diluted hydrochloric acid aqueous solution and the hypochlorite aqueous solution are mixed by the third mixing and diluting unit 61 of the third supply path 7. By mixing and diluting, the hydrochloric acid aqueous solution and the hypochlorite aqueous solution are diluted stepwise, and are produced as weakly acidic chloric water that is uniform and free from unevenness. As a result, the weakly acidic chlorinated water does not contact the locally concentrated hypochlorite aqueous solution and the highly concentrated hydrochloric acid aqueous solution, and therefore can suppress generation of chlorine gas.

  Further, by providing a differential pressure gauge 51 between the first supply path 3 and the second supply path 5 upstream of the first inlet 31 and the second inlet 41, the first supply path 3 and the second supply path. When the pressure difference of 5 occurs, the first flow rate adjustment valve 33 of the first supply path 3 or the second flow rate adjustment valve 43 of the second supply path 5 is operated to eliminate the pressure difference, thereby The flow rate of the dilution water flowing through the supply path 3 and the second supply path 5 can be made equal.

  Further, 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. By mixing the aqueous hydrochloric acid solution and the diluting water that have flowed into the reaction region 35 for a certain period of time, and passing these through the through holes 34a of the plate member 34 and diffusing into the first stable region 36, the aqueous hydrochloric acid solution is evenly distributed. It will be diluted uniformly.

  Similarly, by providing a plate member (baffle plate) 44 in the middle of the second mixing / 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. 2 The hypochlorite aqueous solution and the dilution water that have flowed into the reaction region 45 are mixed for a certain period of time, and further, these are passed through the through-hole 44a of the plate member 44 and diffused into the second stable region 46, so that The aqueous chlorite solution is diluted uniformly without unevenness.

  Similarly, by providing a plate member (baffle plate) 63 in the middle of the third mixing / 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 64. The aqueous hydrochloric acid solution and the hypochlorite aqueous solution that flowed into the plate member are mixed for a certain period of time, and further, these are passed through the through holes 63a of the plate member 63 and diffused into the third stable region 65, whereby the aqueous hydrochloric acid solution and the hypochlorous acid solution are mixed. The aqueous chlorate solution is evenly mixed and diluted evenly, producing weakly acidic chlorinated water that hardly generates chlorine gas.

  Further, a flow meter 23 is provided in the main supply path 2, and the controller 8 supplies a hypochlorite aqueous solution in an amount (proportional) corresponding to the amount of dilution water measured by the flow meter 23. 2 controls the supply device 6 and controls the first supply device 4 so as to supply an aqueous hydrochloric acid solution in an amount proportional to the amount of the hypochlorite aqueous solution supplied from the second supply device 6. Thus, weakly acidic chlorine water having a predetermined concentration and a predetermined pH can be reliably generated.

  Weakly acidic chlorinated water of pH 6 and 7 (hereinafter referred to as “Example”) produced using the weakly acidic chlorinated water production apparatus 1 and chlorinated water of pH 6 and 7 (hereinafter referred to as “Example”) produced by the method described in the background section above A comparative test of the generated chlorine gas concentration of “Comparative Example” was conducted. In this test, for each of the Examples and Comparative Examples, 100 cc of weakly acidic chlorinated water was placed in a beaker and sealed in an airtight sealed container (bag). After standing for 1 minute, the chlorine concentration in the sealed container was determined as chlorine. Measured with a detector tube.

  The test results are shown in FIG. FIG. 3 compares the chlorine gas generation concentrations of the example and the comparative example. For the production of weakly acidic chlorinated water, tap water having a chlorine concentration of 150 ppm was used as dilution water. As shown in FIG. 3, in the case of pH 6 and 7, the concentration of chlorine 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 1 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 1, and the chlorine generation 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 generated chlorine gas concentration can be suppressed low.

  Comparison of weakly acidic chlorinated water produced by using the weakly acidic chlorinated water production apparatus 1 (Example) and weakly acidic chlorinated water (comparative example) produced by the method described in the background section above by performing a bubbling test did. In this test, tap water having a chlorine concentration of 150 ppm was used as dilution water. In the bubbling test, the comparative example was placed in a separate beaker and sealed in a sealed container, and when air was injected into the weakly acidic chlorine water of the beaker for a certain period of time, the chlorine generated from the examples and comparative examples was measured. Concentration was measured. 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 weakly acidic chlorinated water produced by the weakly acidic chlorinated water production apparatus 1 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 1, 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 a case where weakly acidic chlorine water production apparatus 1 produces weakly acidic chlorine water having a pH value of 6, 6.5, ⁷ and injects it into a culture solution of E. coli at about 1 × 10 ⁷ cfu / ml. This shows the number of bacteria. 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. Furthermore, it can be seen that weakly acidic chlorinated water having a pH in the range of 6 to 7 has a higher sterilizing effect, and weakly acidic chlorinated water having a pH of 6 has the highest sterilizing effect.

The weak acidic chlorinated water production apparatus 1 was used to produce weak acidic chlorinated water having different pHs, and a test was conducted to confirm the bactericidal effect against Staphylococcus epidermidis of each of the weakly acidic chlorinated waters 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, pH 9 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 1, and a test was conducted to confirm the bactericidal effect on the Bacillus cereus (spore fungus) of the weakly acidic chlorinated water of each pH. The test results are shown in FIG. FIG. 8 shows that weakly acidic chlorinated water having pH values of 6.0, 6.5, and 7.0 is manufactured by the weakly acidic chlorinated water manufacturing apparatus 1 and used as a culture solution of Bacillus cereus at 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 chlorine water produced without using a hydrochloric acid aqueous 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 more is applied in the range of pH 6.0 to 7.0. Moreover, it turns out that a bactericidal effect is higher in the range of pH 6.0-6.5, and the case of pH 6.0 has the highest bactericidal effect.

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

  For example, in the above embodiment, the weak acidic chlorine water production apparatus 1 in which the first supply path 3 and the second supply path 5 are branched from the main supply path 2 is illustrated, but the first supply path 3 and the second supply are illustrated. The path 5 may be configured independently. In this case, a water supply pump 21 and a flow meter 23 are provided in each of the first supply path 3 and the second supply path 5, and the first supply apparatus 4 and the second supply apparatus 6 are separately controlled by the control device 8. (The flow rate proportional control) or the second supply device is controlled so as to supply the flow rate of the hypochlorite aqueous solution according to the flow rate of the dilution water in the second supply path 5, and supplied from the second supply device The first supply device may be controlled so as to supply an aqueous hydrochloric acid solution in an amount corresponding to the amount of the hypochlorite aqueous solution.

  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 1 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.

  In the above embodiment, the weakly acidic chlorine water production apparatus 1 in which the differential pressure gauge 51 is provided between the first supply path 3 and the second supply path 5 is illustrated. However, instead of the differential pressure gauge 51, the first supply is provided. The flow meter 23 is provided on the upstream side of the first inlet 31 of the path 3 and the flow meter 23 is provided on the upstream side of the second inlet 41 of the second supply path 5. You may make it adjust the flow volume of the dilution water of the 1st supply path 3 and the 2nd supply path 5 based on the measured flow value.

It is a flowchart of the weak acidic chlorine water manufacturing apparatus which concerns on one Embodiment of this invention. It is an enlarged view of the principal part of a weak acidic chlorine water manufacturing apparatus. It is a graph which shows the density | concentration of the chlorine gas generate | occur | produced from the weak acidic chlorine water manufactured with the 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 test 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 manufacturing apparatus, 2 ... Main supply path, 3 ... 1st supply path, 4 ... 1st supply apparatus, 5 ... 2nd supply path, 6 ... 2nd supply apparatus, 7 ... 3rd supply path, DESCRIPTION OF SYMBOLS 8 ... Control apparatus, 31 ... 1st inlet, 32 ... 1st mixing dilution part, 33 ... 1st flow control valve, 34 ... Plate member, 34a ... Through-hole, 41 ... 2nd inlet, 42 ... 2nd mixing Dilution part 43 ... 2nd flow regulating valve 44 ... Plate member 51 ... Differential pressure gauge 61 ... Third mixed dilution part 63 ... Plate member

Claims (5)

A first supply path for supplying dilution water for diluting hydrochloric acid aqueous solution, a supply device for supplying hydrochloric acid aqueous solution to the first supply path, and a second supply path for supplying dilution water for diluting hypochlorite aqueous solution And a supply device for supplying a hypochlorite aqueous solution to the second supply path, a first supply path and a second supply path are joined together, and the hydrochloric acid aqueous solution diluted in the first supply path and the second supply path A weakly acidic chlorinated water production apparatus comprising a third supply path for supplying weakly acidic chlorinated water having a predetermined hydrogen ion index by mixing and diluting a diluted hypochlorite aqueous solution,
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 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,
In the third supply path, a flow resistance is generated, and a hydrochloric acid aqueous solution diluted in the first mixing dilution unit and a hypochlorite aqueous solution diluted in the second mixing dilution unit are mixed to obtain predetermined hydrogen ions. A third mixed dilution section for generating an index of weakly acidic chlorinated water is provided ,
The first supply path and the second supply path are branched from the main supply path for supplying dilution water, and are located upstream of the first inlet in the first supply path and the second inlet in the second supply path. A differential pressure gauge is provided between the first supply path and a first flow rate adjusting valve for adjusting the flow rate of the dilution water in the first supply path, and the second supply path is provided in the first supply path. Is provided with a second flow rate adjustment valve for adjusting the flow rate of the dilution water in the second supply path . 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 weak acid chlorine water manufacturing apparatus according to claim 1 , wherein the first supply path includes a first flow rate adjustment valve on the downstream side of the first mixing dilution section. 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,
The weak acid chlorine water manufacturing apparatus according to claim 1 or 2 , wherein the second supply path includes a second flow rate adjustment valve on the downstream side of the second mixing and dilution unit. A plate member having a plurality of through-holes is provided in the third mixing / dilution unit, and the third mixing / dilution unit generates a flow resistance on the upstream side of the plate member to generate a hydrochloric acid aqueous solution and a hypochlorite aqueous solution. And by passing the hypochlorite aqueous solution together with the hydrochloric acid aqueous solution through the through hole of the plate member, it is configured to generate weakly acidic chlorine water having a predetermined hydrogen ion index,
The weak acid chlorine water manufacturing apparatus according to any one of claims 1 to 3 , wherein the third supply path includes a third flow rate adjustment valve on the downstream side of the third mixing and dilution unit. The hypochlorite aqueous solution supply device is controlled so as to supply a hypochlorite aqueous solution in an amount corresponding to the flow rate of the dilution water to the first supply path, and the hydrochloric acid aqueous solution supply device is hypochlorous acid. from claim 1 is controlled to supply the amount of aqueous hydrochloric acid corresponding to the amount of hypochlorite solution supplied from the supply device of a salt solution to the second supply path according to any one of the 4 Weakly acidic chlorine water production equipment.

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