JPH10118654A - Production of weak acidic sterilizing water and weak alkaline water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce weak acidic sterilizing water and weak alkaline water by using a diaphragm free electrolytic cell and a diaphragm electrolytic cell. SOLUTION: An aq. soln. of chloride such as salt or potassium chloride is electrolyzed in a diaphragm free electrolytic cell 23 to form weak alkaline electrolytic water with an effective chlorine concn. of 30ppm or more and this electrolytic water is guided not only to the anode chamber R21 of a diaphragm electrolytic cell 24 but also to a cathode chamber R22 not only to form weak acidic sterilizing water with an effective chlorine concn. of 30ppm or more in the anode chamber R21 but also to form weak alkaline water in the cathode chamber R22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electrolysis in an electrolytic cell, which is performed by weakly alkaline water and weakly acidic and available chlorine (hypochlorous acid or hypochlorite (sodium or calcium)).
And a slightly acidic sterilized water having a concentration equal to or higher than a predetermined value.

[0002]

2. Description of the Related Art A method for producing a weakly acidic sterilizing water (treatment liquid for sterilization) by electrolyzing a saline solution in an electrolytic cell is disclosed in Japanese Patent Laid-Open No. 8-52.
475. One of the methods for producing weakly acidic sterilized water disclosed in the publication is to first electrolyze a saline solution in a diaphragm electrolyzer, and then to acidify the acid water generated in the anode chamber of the diaphragm electrolyzer. A method of producing weakly acidic sterilized water by electrolysis in a diaphragm-free electrolytic cell, and another method is to first electrolyze water in a diaphragm electrolytic cell, and then to the anode chamber of the diaphragm electrolytic cell. In this method, salt or a saline solution is added to the acidic water generated as above, and then the acidic water containing the salt is electrolyzed in a non-diaphragm electrolytic cell to produce a weakly acidic sterilized water.

[0003]

In the former manufacturing method, an unelectrolyzed saline solution is supplied to both the anode chamber and the cathode chamber of the diaphragm electrolyzer to be electrolyzed, and the water in the saline solution is electrolyzed. oxide ion (OH ^-) and chloride ions (C
l ^- the difference in reaction potential of), for preferentially hydroxide ions reacts, for effective chlorine amount of sterilization effect can be sufficiently obtained (effective chlorine concentration to generate more than a predetermined value), In the diaphragm electrolysis, strongly acidic water having a pH of about 3 is generated in the anode chamber, and strong alkaline water having a pH of about 11 is generated in the cathode chamber.

By the way, the strongly alkaline water obtained by the electrolysis of the saline solution has no general use and is usually discarded without being used, and is wasted. Therefore, a proper disposal device (neutralization device) is required.
In addition, in the case of strong alkaline water, precipitation of a calcium compound or the like is likely to increase, and there is a possibility that clogging of pipes may occur. Also, the p generated in the anode chamber of the diaphragm electrolyzer is
When electrolyzing strongly acidic water of about H3 in a non-diaphragm electrolytic cell to produce weakly acidic sterilized water, strongly acidic water is alkalized by electrolysis in a non-diaphragm electrolytic cell, but the degree is weak. Therefore, it is necessary to perform electrolysis with a large current, which requires a large-sized electrolysis power source and consumes a large amount of power.

On the other hand, in the latter manufacturing method, unelectrolyzed water (which contains almost no electrolyte) is supplied to both the anode chamber and the cathode chamber of the diaphragm electrolyzer to be electrolyzed. In order to generate the desired acidic water in the anode chamber of the diaphragm electrolyzer, it is necessary to flow a large current through the diaphragm electrolyzer. May be damaged, and there is a problem in durability. Also in this case, the alkaline water generated in the cathode chamber of the diaphragm electrolyzer is usually a strong alkali, and thus is wasted.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to address the above-mentioned problems, and comprises the steps of: electrolyzing an aqueous solution of a chloride salt such as salt or calcium chloride in a non-diaphragm electrolytic cell; To generate electrolyzed water having an effective chlorine concentration equal to or higher than a predetermined value, guide the electrolyzed water to the anode chamber of the electrolytic cell having a diaphragm, and guide water to the cathode chamber for electrolysis. A method for producing weakly acidic sterilized water and weakly alkaline water, wherein the weakly acidic sterilized water having a concentration equal to or higher than a predetermined value is generated and the weakly alkaline water is generated in the cathode chamber. In this case, the effective chlorine concentration of the weakly acidic sterilizing water needs to be equal to or higher than a predetermined value at which a sufficient sterilizing effect can be expected, and is desirably, for example, 30 ppm or higher.

In practicing the present invention, the water guided to the cathode chamber is tap water to which an electrolyte mineral such as calcium lactate is added, or the water guided to the cathode chamber is supplied to the electrolysis chamber of a diaphragm-free electrolytic cell. It is desirable to be an aqueous solution of supplied salt or chloride such as calcium chloride.

[0008]

According to the present invention, an electrolyzed aqueous solution of chloride salt such as salt or calcium chloride is electrolyzed in a non-diaphragm electrolytic cell to produce electrolyzed water having a weak alkalinity and an effective chlorine concentration not less than a predetermined value. Therefore, compared to the case where the effective chlorine concentration is obtained by electrolyzing the electrolyzed water having a predetermined value or more in the electrolytic cell of the diaphragm, the electrolyzed water having the effective chlorine concentration of the predetermined value or more is obtained by low-voltage electrolysis. Therefore, it is possible to reduce the size of the electrolytic power supply and to save power.

[0009] In the present invention, the electrolysis in the diaphragm electrolyzer produces weakly acidic sterile water having an effective chlorine concentration of a predetermined value or more in the anode chamber of the diaphragm electrolyzer. Since weakly alkaline water is generated in the cathode compartment of the electrolytic cell, weakly acidic sterilized water can be used as a sterilized water for food such as fresh seafood and fresh vegetables without any change in color, and the weakly alkaline water can be used as it is for drinking. Or, it can be used for cooking, and all the power consumption by electrolysis can be effectively used, and all the electrolyzed water generated by electrolysis can be effectively used without wasteful disposal. In addition, pH adjustment by electrolysis in a diaphragm electrolyzer (pH adjustment from weakly alkaline to weakly acidic) is performed at a lower voltage and lower current compared to pH adjustment by electrolysis in a conventional diaphragm-free electrolyzer. Since adjustment is possible, power can also be saved.

Further, in the present invention, electrolyzed water having a weak alkalinity and an effective chlorine concentration not less than a predetermined value is guided to an anode chamber of an electrolytic cell having a diaphragm, and water is guided to a cathode chamber for electrolysis. In addition to generating weakly acidic sterilized water that is acidic and has an effective chlorine concentration equal to or higher than a predetermined value, it also generates weakly alkaline water in the cathode chamber, and a large current is not required for electrolysis in this diaphragm electrolyzer. In addition, the load on the diaphragm is small, the durability is good, and it can be continuously produced for a long period of time, and can be produced efficiently.

In the practice of the present invention, if the water introduced into the cathode chamber is tap water to which an electrolyte mineral such as calcium lactate has been added, the weak alkaline water generated in the cathode chamber of the diaphragm electrolytic cell may be used. Can be high mineral water and can be optimal for drinking or cooking. When the water guided to the cathode chamber is an aqueous solution of a salt such as salt or calcium chloride supplied to the electrolysis chamber of the diaphragm-free electrolytic cell, the aqueous solution of chloride supplied to the electrolysis chamber of the diaphragm-free electrolytic cell is used. Can be shared, and the apparatus for carrying out the method according to the present invention has a simple configuration and can be implemented at low cost.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a production apparatus for carrying out a method for producing weakly acidic sterilized water and weakly alkaline water according to the present invention.
1. supply pump 12, non-diaphragm electrolytic cell 13, diaphragm electrolyzer 14, water supply valve 15, water purifier 16, mineral supply device 17
And a flow control valve 18.

The storage tank 11 stores an aqueous solution of a salt such as salt or calcium chloride, for example, 0.10% by weight of dilute salt water, and 0.10% by weight of dilute salt water is sequentially replenished therein. It is configured as follows. The supply pump 12
The dilute salt water in the storage tank 11 is supplied at a flow rate of 2.0 liter / min to the inlet 13c of the non-diaphragm electrolytic cell 13. The non-diaphragm electrolytic cell 13 has a positive electrode 13a and a negative electrode 13b, but does not have a diaphragm, and dilutes salt water at a flow rate of 2.0 liter / min from the inlet 13c to the outlet 13d at a voltage of 5 V and a current of 15 A. Electrolysis water is electrolyzed, and the electrolysis water having an effective chlorine concentration of 30 ppm or more, which is weakly alkaline,
In 9.2, electrolyzed water having an effective chlorine concentration of 50 ppm is generated.

The diaphragm electrolyzer 14 has a positive electrode 14a and a negative electrode 14b, a diaphragm 14c, and an anode chamber R having a positive electrode 14a therein.
11 and a cathode chamber R12 provided with a negative electrode 14b
The electrolytic water generated in the non-diaphragm electrolytic cell 13 is supplied to the anode chamber R11 at a flow rate of 2.0 liter / mi.
n and a water supply valve 1 is provided in the cathode chamber R12.
5. Tap water is guided at a flow rate of 2.0 liter / min through the water purifier 16 and the flow control valve 18, and a predetermined amount of electrolyte mineral such as calcium lactate is added to the tap water by the mineral supply device 17. It has become so. The electrolyte mineral has a function of increasing the electrical conductivity of tap water supplied to the cathode chamber R12 to reduce the electrolytic current value to save power, and a function of reducing the alkaline water generated by the cathode chamber R12 by high mineral water. Function.

Meanwhile, in the diaphragm electrolyzer 14, an effective chlorine concentration of 5 and a pH of 9.2 supplied to the anode chamber R11 are supplied.
Tap water to which 0 ppm of electrolyzed water and a predetermined amount of electrolyte mineral supplied to the cathode chamber R12 are added is electrolyzed at a voltage of 4.5 V and a current of 3 A, and this electrolysis weakly acidifies the anode chamber R11. And effective chlorine concentration is 3
A weakly acidic germicidal water of 0 ppm or more, that is, a weakly acidic germicidal water with an effective chlorine concentration of 50 ppm at pH 4.2 is generated, and an effective chlorine concentration of 1 ppm in the cathode chamber R12.
Before and after weak alkaline water, that is, weak alkaline water having an effective chlorine concentration of 1 ppm at pH 10 is generated. Note that the reason why the effective chlorine concentration of the weak alkaline water is low is that chlorine in tap water supplied to the cathode chamber R12 moves to the anode chamber R11 by electrolysis.

In the manufacturing apparatus 10 shown in FIG.
Diluted salt water is electrolyzed in the non-diaphragm electrolytic cell 13 to produce electrolyzed water having a weak alkalinity and an effective chlorine concentration of 30 ppm or more. Electrolyzed water having an effective chlorine concentration of 30 ppm or more can be obtained by low-voltage electrolysis as compared with a case where electrolysis is obtained by electrolysis, so that the size of the electrolytic power supply can be reduced and power consumption can be reduced.

In the production apparatus 10 shown in FIG. 1, the electrolysis in the diaphragm electrolyzer 14 produces weakly acidic sterilized water having an effective chlorine concentration of 30 ppm or more in the anode chamber R11 of the diaphragm electrolyzer 14. At the same time, in the cathode chamber R12 of the diaphragm electrolytic cell 14, the effective chlorine concentration is about 1 ppm, and weak alkaline water of 2 ppm or less is generated.
Weakly acidic sterilized water can be used as sterilizing water for foods such as fresh seafood and fresh vegetables without any change in color, and weakly alkaline water can be used as it is for drinking or cooking, and all power consumption by electrolysis is reduced. It can be effectively used, and all the electrolyzed water generated by the electrolysis can be effectively used without wasting. Moreover, the weak alkaline water described above is
Since it is high mineral water containing an electrolyte mineral such as calcium lactate, it is most suitable for drinking or cooking. Further, pH adjustment by electrolysis in the diaphragm electrolyzer 14 (p from weak alkali to weak acid in the anode chamber R11).
H adjustment) is based on p by electrolysis in a conventional diaphragmless electrolytic cell.
Since the adjustment can be performed at a lower voltage and a lower current than in the H adjustment, power can be saved.

FIG. 2 shows a second embodiment of a production apparatus for carrying out the method for producing weakly acidic sterilized water and weakly alkaline water according to the present invention. The production apparatus 20 of this embodiment comprises a storage tank 21 and a supply pump 22. , A non-diaphragm electrolyzer 23, a diaphragm electrolyzer 24, and a supply pump 25.

The storage tank 21 stores an aqueous solution of a salt such as salt or calcium chloride, for example, 0.10% by weight of dilute salt water, and 0.10% by weight of dilute salt water is sequentially replenished therein. It is configured as follows. The supply pump 22
The dilute salt water in the storage tank 21 is supplied at a flow rate of 2.0 liter / min to the inlet 23c of the diaphragm-free electrolytic cell 23. The non-diaphragm electrolytic cell 23 has a positive electrode 23a and a negative electrode 23b, but does not have a diaphragm, and dilutes salt water at a flow rate of 2.0 liter / min from the inlet 23c to the outlet 23d at a voltage of 5 V and a current of 15 A. Electrolysis water is electrolyzed, and the electrolysis water having an effective chlorine concentration of 30 ppm or more, which is weakly alkaline,
In 9.2, electrolyzed water having an effective chlorine concentration of 50 ppm is generated.

The diaphragm electrolyzer 24 has a positive electrode 24a and a negative electrode 24b, a diaphragm 24c, and an anode chamber R having a positive electrode 24a therein.
21 and a cathode chamber R22 having a negative electrode 24b
The electrolytic water generated in the non-diaphragm electrolytic cell 23 is supplied to the anode chamber R21 at a flow rate of 2.0 liter / mi.
n, and the diluted salt water in the storage tank 21 is guided to the cathode chamber R22 through the supply pump 25 at a flow rate of 2.0 liter / min.

In the diaphragm electrolyzer 24, the effective chlorine concentration at pH 9.2 supplied to the anode chamber R21 is 5
0 ppm of electrolyzed water and 0.1 ppm supplied to the cathode chamber R22.
10% by weight of dilute salt water is electrolyzed at a voltage of 4.5 V and a current of 3 A. By this electrolysis, weakly acidic sterile water having an effective chlorine concentration of 30 ppm or more in the anode chamber R21, that is, pH 5.0. 0 means 51 available chlorine
In addition to the generation of weakly acidic sterilized water of ppm, weakly alkaline water having an effective chlorine concentration of about 1 ppm in the cathode chamber R22, that is, weakly alkaline water having an effective chlorine concentration of 1 ppm at pH 10 is generated. The reason why the effective chlorine concentration of the weak alkaline water is low is that chlorine in the dilute salt water supplied to the cathode chamber R22 moves to the anode chamber R21 by electrolysis.

In the manufacturing apparatus 20 shown in FIG.
Diluted salt water is electrolyzed in the non-diaphragm electrolytic cell 23 to produce electrolyzed water having a weak alkalinity and an effective chlorine concentration of 30 ppm or more. Electrolyzed water having an effective chlorine concentration of 30 ppm or more can be obtained by low-voltage electrolysis as compared with a case where electrolysis is obtained by electrolysis, so that the size of the electrolytic power supply can be reduced and power consumption can be reduced.

Further, in the manufacturing apparatus 20 shown in FIG. 2, weakly acidic sterilized water having an effective chlorine concentration of 30 ppm or more is generated in the anode chamber R21 of the diaphragm electrolyzer 24 and the diaphragm electrolyzer 24 is produced. In the cathode chamber R22, the effective chlorine concentration is about 1 ppm, and weak alkaline water of 2 ppm or less is used. Therefore, the weakly acidic sterilized water is used as a sterilized water for food such as fresh seafood and fresh vegetables without any change in color. It is possible to use the weakly alkaline water as it is for drinking or cooking as it is, and it is possible to effectively use all the power consumption by electrolysis, and without wastefully discarding all the electrolyzed water generated by electrolysis. Each can be used effectively. Further, the pH adjustment by electrolysis in the diaphragm electrolyzer 24 (the pH adjustment from weakly alkaline to weakly acidic in the anode chamber R21) is lower than the pH adjustment by electrolysis in the conventional diaphragmless electrolyzer. Since the adjustment can be performed with a voltage and a low current, power can also be saved.

Further, in the manufacturing apparatus 20 shown in FIG. 2, since the dilute salt water in the storage tank 21 is supplied to the cathode chamber R22 of the diaphragm electrolyzer 24, the apparatus is simple and inexpensive. can do. In the manufacturing apparatus 20 shown in FIG. 2, the supply pump 2 for supplying the dilute salt water in the storage tank 21 to the cathode chamber R22 of the diaphragm electrolyzer 24.
In place of 5, a diverter valve (a storage tank is provided between the non-diaphragm electrolytic cell 23 and the cathode chamber R22 of the diaphragm electrolyzer 24) on the discharge side of the supply pump 22 that supplies the dilute salt water in the storage tank 21 to the non-diaphragm electrolytic cell 23. The flow rate of dilute salt water in 21 is 2.0 liter / min.
It is also possible to provide and carry out a valve (supplied by a). In this case, the discharge flow rate of the supply pump 22 is set to 4.0 liter / min.

In the manufacturing apparatus 20 shown in FIG. 2, a flow rate of 2.0 liter / min.
When 0% by weight of dilute salt water is electrolyzed at a voltage of 6 V and a current of 15 A, electrolyzed water having a pH of 8.5 and an effective chlorine concentration of 30 ppm is generated.
Water supplied at pH 8.5 and an effective chlorine concentration of 30 ppm and 0.10% by weight supplied to the cathode chamber R22
Is electrolyzed at a voltage of 5.5 V and a current of 3.5 A, weak acidic sterilizing water having a pH of 5.0 and an effective chlorine concentration of 35 ppm is produced in the anode chamber R21, and a pH of 10.3 is produced in the cathode chamber R22. Effective chlorine concentration is 1pp at 6
m weak alkaline water is produced.

FIG. 3 shows a third embodiment of a production apparatus for carrying out the method for producing weakly acidic sterilized water and weakly alkaline water according to the present invention. The production apparatus 30 of this embodiment comprises a storage tank 31 and a supply pump 32. , Non-diaphragm electrolyzer 33, diaphragm electrolyzer 34, water supply valve 35, water purifier 36, mineral supply device 3
7. Equipped with a flow control valve 38 and a switching valve 39,
1 except for the switching valve 39, the storage tank 31, the supply pump 32, the non-diaphragm electrolytic cell 33, the diaphragm electrolyzer 34, the water supply valve 35, the water purifier 36,
The mineral supply device 37 and the flow control valve 38 are denoted by similar reference numerals in the thirties, and description thereof is omitted.

The switching valve 39 includes a water supply valve 35, a water purifier 36, a mineral supply device 37, and a flow control valve 38.
Of the tap water supplied from the reactor or the electrolytic water generated in the non-diaphragm electrolytic cell 33 in the cathode chamber R32 of the diaphragm electrolyzer 34
Is configured to be selectively guided. Therefore, when tap water is supplied from the water supply valve 35, the water purifier 36, the mineral supply device 37, and the flow rate control valve 38 to the cathode chamber R32 of the diaphragm electrolyzer 34 by the switching valve 39 (the cathode of the diaphragm electrolyzer 34). Tap water is supplied to the chamber R32 at a flow rate of 2.0 liter / min, and a diaphragm electrolyzer 34 is provided.
When the electrolytic water generated in the non-diaphragm electrolytic cell 33 is supplied to the anode chamber R31 at a flow rate of 2.0 liter / min), the production apparatus 30 in FIG. It operates in the same manner to obtain the same effect.

Further, the diaphragm electrolytic cell 3 is switched by the switching valve 39.
When the electrolytic water generated in the non-diaphragm electrolytic cell 33 is supplied to the cathode chamber R32 of No. 4 in the same manner as the anode chamber R31 of the non-diaphragm electrolytic cell 34, the discharge amount of the supply pump 32 is doubled and the non-diaphragm electrolysis is performed. In the tank 33, dilute saline having a flow rate of 4.0 L / min flowing from the inflow port 33c to the outflow port 33d is electrolyzed at a voltage of 5 V and a current of 15 A to produce electrolyzed water having a pH of 8.9 and an effective chlorine concentration of 20 ppm. Electrolyzed water is supplied to the anode chamber R31 and the cathode chamber R of the diaphragm electrolyzer 34.
32 and a voltage of 4.5 in the diaphragm electrolyzer 34.
Electrolyzed at V and current of 3 A
In 4.2, weakly acidic germicidal water having an effective chlorine concentration of 25 ppm is generated, and weak alkaline germicidal water having an effective chlorine concentration of 15 ppm and a pH of 10 is generated in the cathode chamber. It is also possible to increase the effective chlorine concentration of each sterilizing water generated in the anode chamber R31 and the cathode chamber R32 of the diaphragm electrolyzer 34 to 30 ppm or more by reducing the discharge amount of the supply pump 32.

The manufacturing apparatuses 10 and 3 shown in FIGS.
0, the cathode chamber R of the diaphragm electrolyzers 14 and 34
12. Mineral supply device 1 for tap water led to R32
7 and 37, an electrolytic chamber mineral such as calcium lactate was added.
It is also possible to carry out without 37, and in this case, since the non-electrolyte is not contained, weak alkaline water suitable for drinking and cooking is generated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a first embodiment of a production apparatus for implementing a method for producing weakly acidic sterilized water and weakly alkaline water according to the present invention.

FIG. 2 is a configuration diagram schematically showing a second embodiment of a production apparatus for performing the method for producing weakly acidic sterilized water and weakly alkaline water according to the present invention.

FIG. 3 is a configuration diagram schematically showing a third embodiment of a production apparatus for performing the method for producing weakly acidic sterilized water and weakly alkaline water according to the present invention.

[Explanation of symbols]

10, 20, 30 ... weak acid sterilizing water and weak alkaline water producing apparatus, 11, 21, 31 ... storage tank, 12, 22, 3
2 ... supply pump, 13, 23, 33 ... non-diaphragm electrolytic cell, 2
4 ... diaphragm electrolysis tank, R11, R21, R31 ... anode chamber, R12, R22, R32 ... cathode chamber, 15, 35
... water supply valve, 25 ... supply pump.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 1/50 560 C02F 1/50 560F 1/68 510 1/68 510B 520 520G 540 540E

Claims (4)

[Claims] 1. An electrolyzed aqueous solution of a chloride salt such as salt or calcium chloride in a non-diaphragm electrolytic cell to generate electrolyzed water having a weak alkalinity and an effective chlorine concentration of a predetermined value or more. While conducting water to the anode compartment of the electrolysis cell and conducting water to the cathode compartment for electrolysis, the anode compartment produces weakly acidic sterilized water having an effective chlorine concentration of a predetermined value or more and a weak acidity in the cathode compartment. A method for producing weakly acidic sterilized water and weakly alkaline water that produces alkaline water. 2. Electrolysis of an aqueous solution of a chloride salt such as sodium chloride or calcium chloride in a non-diaphragm electrolytic cell to produce electrolyzed water having a weak alkalinity and an effective chlorine concentration of 30 ppm or more. The water is guided to the anode chamber of the electrolytic cell and water is guided to the cathode chamber to perform electrolysis. In the anode chamber, a weakly acidic sterile water having an effective chlorine concentration of 30 ppm or more is generated, and the effective chlorine concentration is measured in the cathode chamber. Is 2
A method for producing weakly acidic sterilized water and weakly alkaline water that produces weakly alkaline water of not more than ppm. 3. The method for producing weakly acidic sterilized water and weakly alkaline water according to claim 1, wherein the water guided to the cathode chamber is tap water to which an electrolyte mineral such as calcium lactate is added. 4. The weak acid sterilization according to claim 1, wherein the water guided to the cathode chamber is an aqueous solution of a salt or a chloride such as calcium chloride supplied to an electrolysis chamber of a non-diaphragm electrolytic cell. A method for producing water and weakly alkaline water.