JP2626778B2 - Electrolytically generated sterilizing water - Google Patents

Description

The present invention relates to an electrolyzed water for sterilization having a specific pH value and a specific electric conductivity value, and in particular, to a method for producing this electrolyzed water for sterilization in a large amount and It concerns the device.

(Prior art)

With respect to disinfection and sterilization performed in the field of hygiene management of foods and environmental health in medical care, etc., conventionally, alcohol, disinfection and sterilization using sodium hypochlorite solution, etc., and also use electrolytic acid water As this type of disinfecting sterilizing water, the applicant has already prepared sterilized or bacteriostatic electrolyzed water having a specific pH value containing silver ions, as disclosed in Japanese Patent Application No.
No. 61-137786.

[Problems in the prior art]

However, in using the electrolyzed water already known as the water for disinfection and sterilization as in the above-mentioned invention, it is difficult to produce a large amount of water having a low pH value for disinfection and sterilization. Japanese Patent Application No. 61 proposed by people
The use of electrolyzed water containing metal ions or the like as disinfecting and disinfecting water, such as that according to No. In this case, silver ions) are contained in a large amount, that is, because the metal ions are intended to maintain the bactericidal and bacteriostatic effects, there is concern about the accumulation of metals in the human body in food hygiene management. The appearance of sterilized water (bacteriostatic water) not containing metal ions is desired.

[Means to solve the problem]

Therefore, the inventors of the present invention have proposed that, even in electrolytic acidic water having a pH of 1.5 or more and 3.1 or less, a difference in electric conductivity from raw water (EC difference) is 200 to 10,930 μS / cm. It has been found that it has extremely good bactericidal properties, and it is possible to obtain electrolytic acid water having a pH of 1.5 or more and 3.1 or less by adding an ionizing inorganic substance containing a halogen substance or a chlorine substance to raw water in the pretreatment of electrolysis. Even when the difference in electric conductivity (EC difference) from the adjusted raw water is 200 to 14,120 μS / cm, it is found that it has extremely excellent bactericidal properties and can produce a large amount of this. . Therefore, as will be described later, an experiment was conducted on the behavior of the pH value change of the electrolytic acidic water and the sterilizing effect, and based on the results, the electrolytic acidic water obtained by a predetermined method was used as sterilizing water. It is a thing.

That is, the invention according to claim 1 of the present application is an acidic water obtained by adding a water-soluble ionizable inorganic substance to raw water and electrolyzing the water, and having a pH value of 1.5 or more and 3.1 or less, and The difference between the electric conductivity of the acidic water after electrolysis and the electric conductivity of the water before electrolysis obtained by adding a water-soluble ionizable inorganic substance to the raw water is 200 to 14,120 μS / cm. To produce electrolytically produced sterilizing water.

The invention according to claim 2 of the present application is the invention according to claim 1, wherein the ionizable inorganic substance is sodium chloride (NaC).
l), hydrochloric acid (HCl) or sulfuric acid (H ₂ SO ₄ );

[Action]

The germicidal water according to the present invention does not clarify the knowledge on what principle the bactericidal bacteria are killed on the basis of the germicidal water.
It is speculated that as soon as it comes into contact with spores, it acts on the polar region of the bacteria and destroys the bacterial membrane of the bacteria in an instant, resulting in the effect of the bacteria. In view of the fact that acidic water having a pH value of 1.5 to 3.1 and a difference in electric conductivity from raw water (EC difference) of 200 to 14,120 μS / cm has an extremely high bacterial effect, such acidic water Is to be used as disinfecting or sterilizing water. Further, such sterilizing water is produced in large quantities and at low cost by electrolysis. For this reason, water with a low pH value is mixed into the acidic water side of the electrolytic tube or the acidic water obtained from the acidic water outlet side is fed back, while raw water to be supplied to the electrolytic tube in advance is used as a pretreatment during electrolysis. Increase the electric conductivity (EC) to the above pH value of 1.5 to
3.1 and the difference in electric conductivity value with the adjusted raw water (EC
The objective is to produce acidic water with a difference of 150 to 14,400 μS / cm more efficiently and in large quantities at high efficiency and at low cost.

(Example of the invention)

First, the present inventors conducted an experiment on the behavior of the pH value change of the electrolytic acidic water and the bactericidal effect. In other words, the relationship between the behavior of the pH value fluctuation and the bactericidal effect of the electrolyzed acidic water, according to the conventional theory, as the pH value decreases, especially against Bacillus subtilis and spores, the bactericidal effect increases. At pH 1.00 or lower, general bacteria (Bacillus subtilis and spore bacterium) die, but there is a sterilizing effect at around pH 3.00-5.00.

However, the pH was adjusted with H ₂ SO ₄ , and the sterilized water was homogenized `` cucumber '', the ratio of sterilized water to bacterial water was 9: 1 cc, and the contact time between sterilized water and bacterial water was further reduced. As a result of the experiment for 10 minutes, the following cell count behavior value with respect to the pH value fluctuation shown in Table 1 was obtained.

In Table 1, the control of the number of Escherichia coli was 10 ⁷ or more (> 10 ⁷ ).

According to the experimental results on the pH value and the sterilization behavior shown in Table 1, when the pH is simply adjusted from H ₂ SO ₄ , there is no sterilizing effect on Escherichia coli unless the pH is 1.50 or less. It can be understood. That is, according to the conventional theory, even when the pH is between about 3.00 and 1.50, the number of bacteria must continue to decrease as the pH value decreases. Is valid, but beyond that the opinion of the doctrine is not valid and the pH value
Above 1.50, no remarkable bactericidal effect is observed against pH value fluctuations.

The present invention aims to provide sterilizing water having a sterilizing effect even at a pH of 1.50 or more based on such experimental results.

In other words, if an attempt is made to use acidic water for disinfection and disinfection based on the results of this experiment, it must rely on acidic water having a pH of 1.50 or less, which is the same as tap water used in daily life. Raw water with a pH value of about 7.00, such as groundwater, by electrolysis,
This means that the pH value must be 1.50 or less. This is the pH
If an attempt is made to obtain acidic water having a value of 1.50 by electrolysis, enormous energy is required by itself, so that it is impossible to use it for disinfection and sterilization in food hygiene management or the like in terms of cost.

From such a viewpoint, the inventors of the present invention have found that even if the pH value of the electrolyzed water is water of 1.50 or more, the bactericidal effect on Escherichia coli as well as general bacteria (Bacillus subtilis and spores). As a result of various experiments to obtain acidic water by electrolysis with excellent electrolysis, it was found that even water having a pH value of 1.50 or more had an electric conductivity value μS / cm within a certain range. Have been found to have a short sterilizing effect.

Table 2 shows the experimental results showing the relationship between the specific pH value and the specific EC value of the electrolyzed acidic water and the bactericidal effect on general bacteria (Bacillus subtilis and spores).

The experimental conditions for performing this experiment are as follows.

First, the sterilizing effect of (a) raw water simply electrolyzed was verified. Next, (b) a water-soluble ionizable inorganic substance is added to the raw water to adjust to a predetermined electric conductivity (EC) value, and thereafter, this is electrolyzed and sterilized with the obtained acidic water. The effect of was verified.

The procedure of this experiment was as follows. First, the cucumber slices are crushed, stirred, and mixed with water. The cucumber slices are placed in a flanking machine (homogenized cucumber), and the bacteria are propagated while confirming the number of bacteria by a bacterial test (1 ml).
The medium was propagated to 10 ⁸ ) and this was used as a bacterial solution. Next, the raw water is electrolyzed to make the acidic water having a predetermined pH value and electric conductivity value sterilized water (sterilized water 1), and a water-soluble ionizable inorganic substance is added to the raw water to obtain a predetermined electric conduction value. Acid water obtained by electrolyzing the prepared product was prepared as sterilized water (sterilized water 2).

Next, 9 ml each of the sterilized water 1 and the sterilized water 2 was taken, and 1 ml of the sterilized solution was added thereto to make a total of 10 ml. , Neutralized with sodium thiosulfate, etc., and then diluted 100-fold, 1000-fold, 10,000-fold, and 100,000-fold with physiological saline, respectively, and 1 ml each was added to a previously prepared plate agar medium. After culturing at 37 ° C. for 24 to 48 hours, the number of bacteria after the culturing was measured.

For the experiment of (a), the pH value and the EC value of the sterilized water were determined using acidic water obtained by electrolysis, and the minimum EC value was determined as follows:
Acid water obtained by electrolyzing raw water (EC = 70).

In the experiment of (b), NaCl (salt) was used as the water-soluble ionizable inorganic substance. NaCl in raw water (EC = 70)
(Salt) was added, and the EC value of acidic water obtained by electrolyzing water adjusted to EC = 280 μS / cm was defined as the highest EC value.

As described above, the sterilized water (as the germ water) is a homogenized version of “cucumber” as described above. Cucumber homogenized was used.), And the mixing ratio of sterile water and sterile water was 9: sterile water 9: germ water 1. As described above, the contact time between the sterilized water and the germ water is
10 minutes.

Under these conditions, Table 2 shows the bactericidal efficiencies correlating to specific pH and EC values.

According to the experimental results shown in this table, the bactericidal effect is pH
It can be understood that it depends on the value and the EC value. That is, according to the results shown in Table 2, even if the pH value is 1.5 or more, if the pH value is 3.1 or less, the electric conductivity value (EC value) of the water obtained by electrolysis is different from the raw water. , 200μS / c
It can be found that an extremely high bactericidal effect is obtained by appropriately increasing the m to 14,120 μS / cm.

In addition, the inventors of the present application have found that, when calcium lactate is dissolved and added as an additive and electrolyzed, the difference in electric conductivity between raw water and electrolytically generated acidic water having a low pH value is obtained. Was not lower than a predetermined value, and thus such electrolytically produced acidic water did not exhibit a bactericidal effect. Therefore, this comparative example was verified.

For example, electrolysis of water whose electric conductivity is adjusted to (EC = 700μS / cm) by dissolving 1.5g / of calcium lactate used for the purpose of generating calcium ion water,
2.75, acidic water showing an EC value of 600 μS / cm is obtained. Similarly, sodium chloride (NaCl) is added to purified water to adjust the electric conductivity (EC = 700) μS / cm, and the same electrolysis is performed to obtain a pH value of 2.70 and an EC value of 1,380 μS / cm. Electrolytically generated acidic water can be obtained. However, in both cases, the adjusted EC values before electrolysis were the same, and were almost the same after electrolysis.
Although the pH value is shown, the EC value, particularly the EC difference from the adjusted raw water, is 680 μS / cm when salt is added,
Minus 100 μS / cm when calcium lactate is added
Conversely, the EC value has decreased.

Then, in order to verify the bactericidal effect of both of them, an experiment was conducted on the bactericidal efficacy using Salmonella, and it was found that there was a great difference between the effects. That is, as described above, using Salmonella, a bacterial solution is produced, and 9 ml each of the electrolytically produced acidic water with the addition of salt and the electrolytically produced acidic water with the addition of calcium lactate is added thereto, and 1 ml of the bacterial solution in which the Salmonella is suspended is added thereto. After the contact action for a certain period of time, dilution culture was performed using a standard plate agar medium, and the number of remaining bacteria was counted. The results shown in Table 8 were obtained.

As is clear from this table, the electrolytically produced acidic water obtained in the case of adding salt has an excellent bactericidal effect, but in the case of calcium lactate addition, residual bacteria remain when contacted for 300 seconds. Although there is a slight downward trend in numbers,
It can be seen that this is not a problem as compared with the case where salt is added. Therefore, by adding an ionizable inorganic substance such as salt to raw water, it is possible to find an electrolytically produced acidic water having an excellent bactericidal effect that can be clearly distinguished from the case where other substances are added. .

Next, by adding a water-soluble ionizable inorganic substance, even in the case of electrolytically generated acidic water obtained by electrolyzing this, if the difference in electrical conductivity from raw water is not less than a predetermined range, No matter how low the pH value is, such an electrolytically produced acidic water does not have a bactericidal effect, so this comparative example was verified.

In examining this comparative example, first,
Tap water (collected at Miura Electronics Co., Ltd., 184 Kamifoxmori, Kisakata-cho, Yuuri-gun, Akita Prefecture: EC = 70μS / cm, pH = 6.5-6.
7) Hydrochloric acid was added to prepare a regulated raw water having several characteristics as shown in the left column of Table 9 below, and this was electrolyzed under the same conditions as above (DC voltage 60 V, energized for 5 to 8 minutes). Then, electrolytically produced acidic water having the pH value and EC value shown in the middle column of Table 9 was obtained.

In order to verify the bactericidal effect of the electrolyzed acidic water thus obtained, a bacterial solution mixed with E. coli (mixed with bouillon)
In the same manner as described above, 9 ml of each of these generated electrolytically generated acidic waters is taken, and 1 ml of the bacterial solution is added thereto, and after a contact action for 60 seconds, using a standard agar medium,
After dilution culture, the number of remaining bacteria was counted. The results are shown in the right column of Table 9.

As shown by the residual cell count in the right column of Table 9, despite the fact that the contaminated E. coli control was 2.5 × 10 ⁶ , it was exposed to these electrolytically produced acidic waters for a predetermined time and cultured. It can be seen that there is a remarkable difference in the bactericidal effect with an EC difference of 200 μS / cm from the adjusted raw water.

That is, after the E. coli control 2.5 × 10 ⁶ was initially brought into contact with the electrolytically generated acidic water (No 1 to No 6) for a predetermined time (60 seconds). When this was cultured, the pH value was 2.
Within the range of strong acidity of about 90 to 2.92, the difference in electric conductivity (EC difference) from the adjusted raw water exceeds 200 μS / cm, and the electric conductivity value (actually, EC as the difference)
Value), the number of remaining E. coli is reduced so that it cannot be confirmed, and shows an extremely excellent bactericidal effect, whereas the difference in electric conductivity from the raw water is 200μS / cm or less. In the case of electrolytically produced acidic water having electric conductivity, only a slight decrease in the number of remaining E. coli is observed.

More specifically, in the case of the electrolytically generated acidic water of Sample No. 1, No. 2, and No. 3, the EC difference from the adjusted raw water was 297.8 μS
/ cm, 254.3 μS / cm, and 204.0 μS / cm, and no remaining Escherichia coli could be confirmed in the electrolytic acidic water having these EC differences.

However, in the electrolytically generated acidic water of No. 6, the EC difference from the adjusted raw water is 164.8 μS / cm, and for this,
A residual E. coli count of 2.1 × 10 ⁵ was observed.

In the case of No. 4 and No. 5 electrolytically generated acidic water, the EC difference from the adjusted raw water was 202.4 μS / cm and 191.5 μS / cm, respectively.
cm, and for these, 6.0 × 10 ¹ , 1.2 × 10 ²
, A slight residual bacterial count was confirmed. However, they clearly show a tendency to decrease the number of remaining bacteria even when compared to the initial control E. coli.

From the above, in these electrolytically produced acidic waters, a remarkable bactericidal effect can be found when the EC difference from the control raw water is about 200 μS / cm.

The sterilizing effect of the electrolytically generated acidic water having such characteristics is a sterilizing effect under a bad environment mixed with bouillon, which is an organic substance. It functions satisfactorily as sterilizing and disinfecting water. Actually, even if these electrolytically produced acidic waters are used as sterilizing water and disinfecting water, there may be no inconvenience.

Next, an embodiment of an apparatus for producing the sterilizing water 1 and the sterilizing water 2 using electrolytically generated acidic water will be described.

1 (A) and 1 (B) are schematic views of an apparatus according to the present invention for producing the sterilized water 1 and the sterilized water 2 according to the present invention. In FIG. 1, reference numeral 1 denotes an electrolysis chamber, which includes a bottom plate 2 made of a non-conductive material, a cathode plate 3 made of stainless steel or the like surrounding the outer periphery, and a lid plate 4 made of a non-conductive material. An anode plate 5 is attached to the cover plate 4 so as to extend inside. The cover plate 4 is provided with an anode terminal 6. The cathode plate 3 has a cathode terminal 7.
Is provided. A cylindrical diaphragm 8 is disposed inside the electrolytic chamber 1 so as to surround the anode plate 5, and is divided into an anode chamber 9 and a cathode chamber 10 by the diaphragm 8.

The anode 8 supplies Ca ⁺⁺ , Mg ⁺ , Na ⁺ , K ^+, etc. from the anode chamber to the cathode chamber 10.
And pass Cl ⁻ , SO ₄ ⁻ , HCO ₃ ^{− and the} like from the cathode chamber 10 to the anode chamber 9 and do not return them. Therefore, the anode terminal 6 and the cathode terminal 7 have predetermined properties. By applying a voltage, the anode chamber 9
In the meantime, acidic water is separated from the alkaline water in the cathode chamber 10 by electrolysis.

The bottom plate 2 is connected to an anode-side raw water introduction pipe 11 and a cathode-side raw water introduction pipe 12 composed of a pipe having a smaller diameter than the anode-side raw water introduction pipe 11. The raw water introduction pipe 11 and the raw water introduction pipe 12 are connected to a raw water introduction pipe 13, that is, the raw water supplied from the raw water introduction pipe 13 is branched to the anode side and the cathode side, respectively, to form the anode chamber 9 and the cathode chamber, respectively. It is configured to supply raw water to 10.

The cover plate 4 is provided with a cathode chamber side outlet pipe 14 for extracting alkaline water by electrolysis from the cathode chamber 10.
Along with the valve 15, an anode chamber side outlet pipe 16 for extracting acid water generated as a result of electrolysis from the anode chamber 9 is provided together with a valve 17.

FIG. 2A and FIG.
The treatment shown in (B) was performed to obtain electrolytic acidic water. FIG.
(A) and (B) show the respective pH values with respect to the applied voltage and current and the amount of obtained acidic water and alkaline water when electrolysis is performed without adding additives to raw water (EC value = 70). FIG. 3 shows additives (water-soluble ionizable inorganic substances)
This is an outline of the case where the electrolysis is performed after adjusting the pH value after adding (salt addition).

The bactericidal effect of such electrolytic acid water was verified in Table 2 described above.

Furthermore, in order to be able to use electrolyzed water having such a tremendous bactericidal effect for disinfection and sterilization, on food hygiene management, how large and cheap it can be provided is realistic. Is a problem, such a pH value of 1.5 to 3.1
And the difference between the electric conductivity value and raw water (EC difference) is 200 ~ 14,
Since it is difficult to obtain a large amount of 120 μS / cm of electrolyzed water in an ordinary state, electrolyzed acidic water was produced according to FIG. 2B. The apparatus of this embodiment has such a pH value of 1.5.
~ 3.1 and the difference in electric conductivity value with the adjusted raw water (E
In view of the fact that electrolyzed water having a C difference of 200 to 14,120 μS / cm has a tremendous effect on the sterilization effect, this is for obtaining a large amount of such acidic water by electrolysis at low cost. In this connection, the inventors of the present invention conducted an experiment for increasing the electric conductivity value of the electrolyzed water based on Table 2 above, and as a result, added some additives to the raw water. In addition, in the electrolysis process of raw water, the pH value is 1.5 to 3.1 by adding an additive to the supply on the acidic side with respect to the supply on the acidic side, and the adjusted electric conductivity value with the raw water. And a large amount of electrolyzed water having a difference (EC difference) of 200 to 14,120 μS / cm can be obtained with high efficiency.

A second embodiment of a mechanical device for obtaining a large amount of electrolyzed water having a pH value of 1.5 to 3.1 and an electric conduction value difference (EC difference) from raw water of 200 to 14,120 μS / cm or more according to the present invention. The device will be described with reference to the drawings. FIG. 1B is a schematic view of an apparatus according to an embodiment of the present invention.

The device according to FIG. 1 (B) is basically the same as the device of FIG. 1 (A), except that the anode chamber side lead-out pipe 16 is provided with a valve 18 immediately before the valve 17, Connected by the anode side raw water introduction pipe 11 and the feedback pipe 19, a part of the acidic water generated by the electrolysis, through the feedback pipe 19,
The raw water supplied to the anode-side raw water introduction pipe 11 is supplied to the anode chamber 9.
The difference is that the internal pH is lowered.

The feed bag pipe 19 is connected immediately after the venturi section 20 provided in the anode-side raw water introduction pipe 11. The venturi section 20, when the raw water introduction pipe 13 and the cathode-side raw water introduction pipe 12 are located on the anode chamber 9 side from the branch point, narrowing the water passage of the anode-side raw water introduction pipe 11, and when water pressure is applied In the venturi section 20, a negative pressure is generated on the side of the feedback pipe 19. That is, the raw water introduction pipe 13
When water pressure is applied to the anode chamber 9, a negative pressure is generated in the anode chamber 9 side of the venturi section 20, and this negative pressure causes a part of the acidic water generated as a result of electrolysis from the feed bag pipe 19 to the anode chamber side outlet pipe 16. Is to be sucked from.

As a result, the electrolyzed acidic water is partially fed back, so that more acidic water having a low pH value can be supplied.

However, the flow rate ratio between the acidic water and the alkaline water obtained from the anode chamber side outlet pipe 16 is adjusted by adjusting the pH value of the feedback in the pretreatment step, or by adding an additive to the feedback water. By changing the EC value of water, the flow rate ratio changes,
It is possible to produce a high ratio of acidic water having a low pH value.

Then, the inventor of the present application repeated the experiment on the additive to be added to the raw water, that is, the ratio of the feedback.

In this experiment, a cylindrical electrolytic tube was used, and a Pt ^- Ir electrode (Pt 70%, Ir 30% weight ratio) was used as an anode electrode and Sus304 was used as a cathode electrode.

In the case where no additive is added to raw water as shown in FIGS. 2A and 2B using such an electrolytic tube, the pH condition of raw water is 6.65, and the electric conductivity (EC) is 70 μS /
Experiments on the supply amount of acidic water were carried out for two cases, that is, the case of cm and the condition of raw water pH condition 6.5 and the electric conductivity of 220 μS / cm.

The supply currents in these cases are 2
The current values were A, 5A, and 10A.

From the experimental results, it was found that the higher the electric conductivity value of the raw water was set, the higher the pH value of the obtained acidic water was. Therefore, in the block diagram as shown in the modified diagram as shown in FIG. 3, the condition of the electric conductivity value of the raw water is changed by adding salt, and a part of the obtained acidic water is fed back to be changed. 3
From the table, the results shown in Table 7 were obtained.

In this experiment, Table 3 shows the case where the pH value of the raw water was set at 6.65 and the electric conduction value (EC) was adjusted to 205 μS / cm by adding salt to the solution.
Table 4 shows the results obtained at 95 μS / cm, Table 5 shows the results obtained at EC420 μS / cm, Table 6 shows the results obtained at EC540 μS / cm, and Table 7 shows the results obtained at EC980 μS / cm. This is shown in FIG.

In addition, in FIG. 3, P2 is a pump which feeds back the acidic water by electrolysis to raw water, and A is a meter which shows the amount which added the acidic water by electrolysis to raw water. Further, the feedback amount was constant at 24 cc.

As a result, feedback conditions are as follows: by adding a water-soluble ionizable inorganic substance to raw water before electrolysis and increasing the electrical conductivity of the raw water, acidic water with a low pH value is efficiently produced. be able to.

In order to set the electric conductivity (EC) of the raw water high in the pretreatment stage of the electrolysis, in this experiment,
The electric conductivity was increased by adding NaCl (salt). This is because the pre-treatment of raw water is possible even when dissolving water-soluble strongly ionizable substances with high ionization such as H ₂ SO ₄ and HCl (hydrochloric acid). The electric conductivity can be set high and can be adjusted to a predetermined electric conductivity value.

〔The invention's effect〕

According to the present invention, simply obtained by electrolyzing water
pH value is 1.5 or more and 3.1 or less, and the difference in electric conductivity (EC difference) from raw water is 200 to 10,930 or 200 to 14,120μ
Since acidic water of S / cm is used as sterilizing water, after sterilization, if the acidity is neutralized by washing with the alkaline water similarly obtained by electrolysis, it is reduced to water before electrolysis. Therefore, sterile water that is completely harmless can be obtained.

Also, after sterilization as described above, by washing with alkaline water obtained by electrolysis, the acidic water is allowed to stand for a certain period of time without going through a process of neutralizing the acidity. Only by obtaining energy from the outside, it is electrically reduced by discharge and becomes harmless water. Therefore, even if such acidic water, which is very effective for sterilization, is left inadvertently, it becomes harmless as time passes, so that extremely safe sterilized water can be obtained.

Furthermore, such an acidic water is in a normal state, in a large amount, and it is difficult to produce inexpensively. However, according to the method and the apparatus for producing the acidic water based on the present invention, it is extremely easy and Inexpensive, and can be manufactured in large quantities, even in the field of food manufacturing and processing or in the field of food distribution that requires long-term storage of food, can be easily and harmlessly sterilized, There is an extremely excellent effect that a great effect can be exhibited.

[Brief description of the drawings]

FIGS. 1 (A) and 1 (B) are schematic diagrams of an embodiment of a sterilizing water producing apparatus having a predetermined pH value and a predetermined electric conduction value according to the present invention, and FIGS. 2 (A) and 2 (B) show different electric conductions. As for the degree, the experiment of the obtained acidic water supply amount was modified and shown, and the tables attached to (A) and (B) show the results. FIG. 3 is a modify block diagram in the case where the condition of the electric conductivity value of raw water is changed by adding salt, and a part of the obtained acidic water is fed back. In the figure, 1; electrolytic chamber, 2; bottom plate, 3; cathode plate, 4; lid plate, 5; anode plate, 6; anode terminal, 7; cathode terminal, 8; diaphragm, 9; anode chamber, 10; cathode. Room, 11; anode side raw water introduction pipe,
12; Cathode side raw water introduction pipe, 13; Raw water introduction pipe, 14; Cathode room side outgoing pipe, 15, 17, 18; Valve, 16; Anode room side outgoing pipe 16, 19; Feedback pipe, 20; Venturi section, P2 ;pump.

Claims (2)

(57) [Claims] An acidic water obtained by adding a water-soluble ionizable inorganic substance to raw water and electrolyzing the same, wherein the pH value of the acidic water is 1.5 or more and 3.1 or less, and the acidic water after electrolysis is obtained. The difference between the electric conductivity of the raw water and the electric conductivity of water before electrolysis obtained by adding a water-soluble ionizable inorganic substance to the raw water is 200 to 14,
Electrolytically produced sterilizing water having a flow rate of 120 μS / cm. 2. The electrolytic method according to claim 1, wherein the ionizable inorganic substance is made of any one of sodium chloride (NaCl), hydrochloric acid (HCl), and sulfuric acid (H ₂ SO ₄ ). Produce sterile water.