JPH10201694A - Method and device for washing and sterilizing dishes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently wash and sterilize dishes by electrolyzing a chloride salt aqueous solution with a diaphragm electrolytic cell to generate strong acidic water and strong alkaline water having specified pH values, performing the washing with the strong alkaline water, and then performing the sterilization with a hypochlorous acid sterilizing water obtained by diluting the strong acidic water. SOLUTION: An aqueous solution having a relatively high concentration which contains a chloride salt such as sodium chloride, potassium chloride or the like is electrolyzed in a diaphragm electrolytic cell to generate a strongly alkaline water of pH 10.5 or more and a strongly acidic water of pH1-3.5. The strongly alkaline water is diluted with tap water and regulated to a strongly alkaline water of pH10.5-13.5, and the strongly acidic water is diluted with tap water and regulated to a hypochlorous acid sterilizing water having pH4-8 which has high sterilizing force but is nontoxic to human body. The thus regulated sternly alkaline water of pH10.5-13.5 is sprayed to dishes, preferably, in shower form to remove oil and wash the dishes, and the dishes are then sterilized with the hypochlorous acid sterilizing water of pH4-8, whereby washing and sterilization of the dishes can be efficiently performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning and sterilizing tableware, and more particularly, to a method and a method using strong alkaline water and strong acid water obtained by electrolyzing an aqueous solution of a chloride salt such as sodium chloride. The present invention relates to a dishwashing method and apparatus for performing degrease cleaning of tableware with strong alkaline water and sterilization with hypochlorous acid sterilized water.

[0002]

2. Description of the Related Art When water containing chloride salts such as sodium chloride and potassium chloride is electrolyzed into alkaline water and acidic water in, for example, a diaphragm electrolyzer, a strong alkaline water having a high pH is obtained.
This alkaline water is suitable for washing grease on tableware. On the other hand, water obtained by electrolyzing the above-mentioned water containing a chloride salt in a diaphragm-free electrolytic cell contains a large amount of hypochlorous acid and is extremely effective as sterilizing water. Therefore, when the primary cleaning of the tableware is performed with the above-described alkaline water and the secondary cleaning is performed with the sterilized water of hypochlorous acid, efficient cleaning and sterilization of the tableware can be performed.

[0003]

However, if strong alkaline water and hypochlorous acid water are separately produced using independent electrolytic devices, the cost increases and the device becomes large. Moreover, if it is attempted to adjust the strong alkaline water and hypochlorous acid water at the desired pH with only the electrolyzed water, it is difficult to adjust the pH,
The electrolysis efficiency of the electrolyzer is relatively poor. Further, the diaphragm electrolytic cell uses only strong alkaline water, and the acidic water is discarded, so that the water is wasted.

Accordingly, a first object of the present invention is to provide a method for efficiently cleaning and disinfecting tableware, and in particular, for cleaning tableware which is easy to adjust pH, has good electrolysis efficiency, and has little waste water. -To provide a sterilization method.

[0005] A second object of the present invention is to provide an apparatus for performing the above-described dishwashing / sterilizing method.

In order to achieve the first object, a method for cleaning and sterilizing tableware according to the first aspect of the present invention is to provide a method for electrolyzing a chloride salt aqueous solution in a diaphragm electrolyzer to obtain a strong acid having a pH of 1 to 3.5. A strong water and a strong alkaline water are produced, and the strong alkaline water is diluted with water to adjust to a strong alkaline water having a pH of 10.5 to 13.5, and the strong acidic water is diluted with water to a pH of 4 to
8 adjusted to hypochlorous acid sterilized water,
After washing the dishes with 3.5 alkaline water, the dishes are sterilized with the hypochlorous acid sterilizing water.

In order to achieve the first object,
In the dishwashing / sterilizing method according to claim 2 of the present invention, a chloride salt aqueous solution is electrolyzed in a diaphragm electrolyzer to generate strongly acidic water and strongly alkaline water having a pH of 1 to 3.5, and the strong alkaline water is produced. It was diluted with water to adjust to a strong alkaline water having a pH of 10.5 to 13.5, and on the other hand, electrolytically treated water obtained by electrolyzing a chloride salt aqueous solution in a non-diaphragm electrolytic cell or a diluted aqueous solution thereof was produced by the above-mentioned diaphragm electrolysis. Mix with strongly acidic water to adjust to hypochlorite sterilized water having a pH of 4 to 8, and adjust the pH to 10.5 to 13.
After washing the dishes with strong alkaline water of No. 5, the dishes are sterilized with the hypochlorous acid sterilizing water.

Further, in order to achieve the first object, a dishwashing / sterilizing method according to claim 3 of the present invention comprises:
An aqueous chloride salt solution is electrolyzed in a diaphragm electrolyzer to adjust the pH to 10.5.
The pH is adjusted to 13.5 to 13.5 and the pH is 1 to 3.5, and the pH is 1 to 3.5 or the pH is 1 to 3.5. The mixed water is electrolyzed in a non-diaphragm electrolytic cell to adjust to hypochlorite sterilized water having a pH of 4 to 8, and the dishes are washed with strong alkaline water having a pH of 10.5 to 13.5. Disinfected with hypochlorous acid sterilized water

In each case, a part of the strongly acidic water having a pH of 1 to 3.5 electrolyzed in the diaphragm electrolyzer is further neutralized and / or washed with the strong alkaline water used for washing the dishes. May be used for dissolving and removing calcium and astringent attached to tableware.

[0010] In order to achieve the second object, a dishwashing and sterilizing apparatus according to claim 5 of the present invention has a pH of 10.
A washing water adjusting device for simultaneously producing a strong alkaline water of 5 to 13.5 and a hypochlorous acid sterilizing water having a pH of 4 to 8, and the strong alkaline water and the hypochlorous acid water generated by the washing water generating device; A washing water supply pipe for separately supplying water, and a dishwashing tank provided with a nozzle communicating with each washing water supply pipe, and the washing water adjusting device is provided with a cathode chamber and an anode chamber via an electrolytic diaphragm. One side of the partitioned electrolytic cell has a water supply pipe circuit of a chloride salt aqueous solution, and the other side has a cathode chamber side discharge pipe and an anode chamber side discharge pipe, and the chloride salt supplied from the water supply pipe circuit. Electrolyzed aqueous solution to discharge strongly alkaline water from the cathode chamber side discharge pipe, and discharge strong acid water containing hypochlorous acid and chlorine gas from the anode chamber side discharge pipe; A dilution water supply pipe for supplying and diluting raw water to the strongly alkaline water of the discharge pipe; and an anode chamber side Characterized by comprising a; and diluting water supply pipe for dilution by supplying raw water to the exit pipe.

In order to achieve the second object,
The dishwashing and sterilizing apparatus according to claim 6 of the present invention has a pH of 10.
A washing water adjusting device for simultaneously producing a strong alkaline water of 5 to 13.5 and a hypochlorous acid sterilizing water of pH 4 to 8, and the strong alkaline water and the hypochlorous acid water generated by the washing water adjusting device are each A washing water supply pipe for separately supplying water and a dishwashing tank provided with a nozzle communicating with each washing water supply pipe were provided, and the washing water adjusting device was partitioned into a cathode chamber and an anode chamber via an electrolytic diaphragm. One side of the diaphragm electrolyzer has a water supply pipe circuit of a chloride salt aqueous solution, and the other side has a cathode chamber side discharge pipe and an anode chamber side discharge pipe, and the chloride salt aqueous solution supplied from the water supply pipe circuit is supplied with water. Electrolyzed to discharge strongly alkaline water from the cathode chamber side discharge pipe, and to discharge strongly acidic water containing hypochlorous acid and chlorine gas from the anode chamber side discharge pipe; A dilution water supply pipe for supplying and diluting raw water to alkaline water; And a non-diaphragm electrolysis water conditioning apparatus for electrolyzing a chloride salt aqueous solution supplied from the water supply pipe and draining it from a discharge pipe; and an anode chamber of the diaphragm electrolysis water conditioning apparatus A part of the strong acid water generated from the diaphragm electrolyzer is connected to the water circuit of the non-diaphragm electrolysis water conditioning device from the side drainage circuit and supplied to a drainage circuit or a water supply circuit of the non-diaphragm electrolysis water conditioning device. a pH / concentration adjusting conduit for adjusting the pH and the concentration of hypochlorous acid.

In order to achieve the second object, the apparatus for cleaning and sterilizing dishes according to claim 7 of the present invention has a pH of 10.5-1.
A washing water conditioner for simultaneously producing 3.5 strongly alkaline water and a hypochlorite disinfecting water having a pH of 4 to 8; and separately supplying the strong alkaline water and hypochlorous acid solution produced by the washing water conditioner. A washing water supply pipe, and a dishwashing tank provided with a nozzle communicating with each of the washing water supply pipes, wherein the washing water adjusting device separates a cathode chamber and an anode chamber through an electrolytic membrane. One side of the electrolytic cell has a water supply pipe circuit for a chloride salt aqueous solution, and the other side has a cathode chamber side discharge pipe and an anode chamber side discharge pipe to electrolyze the chloride salt aqueous solution supplied from the water supply pipe circuit. A diaphragm electrolyzer for discharging strongly alkaline water from a discharge pipe on the cathode chamber side and discharging strongly acidic water containing hypochlorous acid and chlorine gas from a discharge pipe on the anode chamber side; Electrolyte the strongly acidic water prepared in Step 2 or a mixture of this strongly acidic water and the aqueous solution of chloride salt. Cleaning and sterilizing apparatus for dishes, characterized by comprising; a diaphragm-free electrolytic water conditioner apparatus for generating hypochlorous acid sterilizing water Te

When a non-diaphragm electrolysis water conditioning apparatus is used together, a diluting water supply pipe may be further connected to a drain pipe of the non-diaphragm electrolysis tank.

In any case, the washing water adjusting device further includes a strong acid water branch drain pipe branched from the anode chamber side discharge pipe of the diaphragm electrolyzer, and the branch drain pipe and the dishwashing tank. A strongly acidic water supply pipe may be provided between the two, and a part of the strongly acidic water in the anode chamber side discharge pipe of the diaphragm electrolyzer may be supplied to the dishwashing tank.

[0015]

Next, an embodiment of the present invention will be described. In a first embodiment of the method for cleaning and sterilizing tableware according to the present invention, a relatively high concentration aqueous solution containing a chloride salt such as sodium chloride or potassium chloride is electrolyzed in a diaphragm electrolyzer.
Produces a strong alkaline water of H10.5 or more and a strongly acidic water of pH 1 to 3.5. Next, the strong alkaline water produced by the above-mentioned diaphragm electrolysis is diluted with raw water such as tap water to adjust the pH to 1
While adjusting to a strong alkaline water of 0.5 to 13.5,
The strongly acidic water having a pH of 1 to 3.5 generated by the diaphragm electrolysis is diluted with raw water such as tap water to adjust to a hypochlorite sterilized water having a pH of 4 to 8. Here, the “relatively high concentration” of the chloride salt aqueous solution means that the concentration is higher than that of the chloride aqueous solution when the intended strong alkaline water for cleaning is generated only by the electrolytic treatment. As described above, since the relatively high concentration aqueous chloride salt solution is electrolyzed, the electric conductivity is high and the electrolysis efficiency is good.

PH 10.5-13.5, preferably p
Strong alkaline water of H12 or more is extremely effective for cleaning grease from tableware, etc., but electrolyze a chloride salt aqueous solution in a diaphragm electrolyzer to obtain strong alkaline water having a pH of 10.5 to 13.5 or more. Then, the strongly acidic water generated from the anode compartment of the diaphragm electrolyzer has a pH of 1 to 3.5, and the strongly acidic water at this pH contains chlorine gas and is harmful. Therefore, the first embodiment of the method for washing and sterilizing tableware according to the present invention is characterized in that strong acidic water having a pH of 4 to 8 which is strong and has no harm to the human body is obtained by diluting the strongly acidic water having a pH of 1 to 3.5 with raw water. Is adjusted to a hypochlorous acid aqueous solution.

The pH adjusted in this manner is 10.5-1.
After 3.5 g of strong alkaline water is sprayed on the dishes, preferably in the form of a shower, the dishes are drained and washed, and then the dishes are sterilized with the hypochlorous acid sterilized water having a pH of 4 to 8. As a result, efficient washing and sterilization of tableware is performed.

A second embodiment of the dishwashing / sterilizing method according to the present invention is the same as described above, except that a chloride salt aqueous solution is treated in a diaphragm electrolyzer with strongly alkaline water having a pH of 10.5 or more and strongly acidic water having a pH of 1 to 3.5. And diluting the strong alkaline water with water such as tap water to adjust the pH to a strong alkaline water having a pH of 10.5 to 13.5, and washing the dishes with the strong alkaline water. On the other hand, a chloride salt aqueous solution such as sodium chloride and potassium chloride is subjected to diaphragm-free electrolysis, and the obtained electrolyzed water or water obtained by mixing and diluting raw water with the electrolyzed water is used for the anode chamber side generated by the above-mentioned diaphragm electrolysis. It is mixed with strongly acidic water of pH 1 to 3.5 to adjust to hypochlorite sterilized water of pH 4 to 8, and the tableware is sterilized with the hypochlorous acid sterilized water. That is, the second embodiment of the cleaning / sterilizing method according to the present invention is to mix electrolytically treated water having a high pH value obtained by subjecting a chloride salt aqueous solution to non-diaphragm electrolysis with the strongly acidic water having a pH of 1 to 3.5. pH 4 ~
The hypochlorous acid water of No. 8 is adjusted.

A third embodiment of the dishwashing / sterilizing method according to the present invention is a method of washing a chloride salt aqueous solution with a pH of 10.5 in a diaphragm electrolyzer.
Electrolyze strong alkaline water of １３13.5 and strongly acidic water of pH 1-3.5, and wash dishes with strong alkaline water of pH 10.5-13.5 which is not diluted with water. On the other hand, pH 4
Hypochlorous acid sterilized water of ~ 8 is prepared by strongly electrolyzing the strongly acidic water or the mixed water of the strongly acidic water and an aqueous solution of a chloride salt such as sodium chloride by diaphragm-free electrolysis. It sterilizes.

As described above, when dishwashing is performed with strong alkaline water having a pH of 10.5 to 13.5 obtained by electrolyzing an aqueous solution of a chloride salt such as sodium chloride, precipitation occurs after washing with strong alkaline water. Calcium may adhere to tableware, and alkaline water used for washing has a high pH value, so it is not preferable to discard it as it is in a drain or the like. Therefore, a third embodiment of the dishwashing / sterilizing method according to the present invention comprises:
In addition to the above first and second methods, a part of the strongly acidic water having a pH of 1 to 3.5 obtained by electrolyzing a chloride salt aqueous solution with a diaphragm is directly supplied to a dishwashing tank, The above problem is solved by using as washing water for dissolving calcium in tableware washed with water or as a neutralizing agent for strong alkaline water used for washing.

Next, an embodiment of a dishwashing / sterilizing apparatus according to the present invention will be described with reference to the accompanying drawings. As shown
The dishwashing / sterilizing apparatus according to the present invention includes a dishwashing tank 1 for holding dishes such as tableware and kitchen utensils for washing, a washing / sterilizing water adjusting device 2 for generating water used in the washing tank, and a sterilizing apparatus. The washing water supply means 3 supplies washing water or sterilization water generated by the water adjusting device to the washing tank 1.

The washing / sterilizing water adjusting device 2 comprises a strong alkaline water having a pH of 10.5 to 13.5 for oil removal washing and a sterilizing p-water.
H4 to H8, and if necessary, strongly acidic water having a pH of 1 to 3.5 in addition to the strong alkaline water and the hypochlorous acid water.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cleaning / sterilizing water adjusting apparatus 2 of the apparatus shown in FIG. 1 has a diaphragm electrode in which a cathode electrode 7 and an anode chamber 8 are partitioned by an electrolytic diaphragm 6 between a negative electrode 4 and a positive electrode 5 which are arranged opposite to each other. The diaphragm electrolyzer 9 has a water supply pipe circuit 10 for supplying raw water such as tap water and a chloride salt solution such as sodium chloride to a lower water supply section, and a cathode chamber side discharge pipe at an upper part. 11 and an anode-chamber-side discharge pipe 12, and constitutes a continuous water-flow type electrolytic water regulator as a whole.

A water supply pipe circuit 10 shown in FIG. 1 for supplying an aqueous solution of a chloride salt such as sodium chloride to a water supply port of a diaphragm electrolyzer 9.
Is a pipe 14 branched from a raw water supply main pipe 13, a tank 15 for producing a chloride salt aqueous solution by mixing a part of the raw water supplied from the pipe 14 with a chloride salt,
A tank 16 for mixing a part of the water from the pipe line 14 with the aqueous chloride salt solution 5 to adjust the aqueous solution to 1 to 5%, preferably 2 to 3% chloride salt aqueous solution; Tank 9
A pipe 17 leading to a water supply port of the apparatus is provided.
Is supplied to the electrode chambers 7 and 8 of the diaphragm electrolyzer 9 through the electrode.

The electrolytic water conditioner configured as described above uses the aqueous chloride salt solution supplied from the water supply pipe circuit
To produce a strong alkaline water having a pH of 11 or more in the cathode chamber 7 and send it out from the cathode chamber side discharge pipe 11, and generate a strong acid water containing hypochlorous acid and chlorine gas in the anode chamber 8 to produce the anode chamber. It is sent out through the side discharge pipe 12. Although illustration is omitted, the cathode chamber side discharge pipe 11 and the anode chamber side discharge pipe 12 may be provided with a flow rate adjusting means such as a flow valve.

A diluted water supply pipe 2 for diluting and increasing the strong alkaline water of the discharge pipe 11 is provided on the cathode chamber side discharge pipe 11.
0a is connected via a flow control valve 21 and a flow switch 22. By mixing raw water from a dilution water supply pipe 20a with strong alkaline water in a cathode chamber side discharge pipe 11, p
The pH is adjusted to H10.5 to 13.5 and the increased amount of strong alkaline water is discharged from the strong alkaline water pipe A.

On the other hand, the dilution water supply pipe 20b is also provided with a flow control valve 23 and a flow switch 24 in the anode chamber side discharge pipe 12.
And a strong acidic water containing hypochlorous acid / chlorine gas sent out from the anode chamber side discharge pipe 12;
The water supplied from the dilution water supply pipe 20b is mixed. Mixing of strongly acidic water and dilution water in this case
The hypochlorite (HClO) is generated by reacting the chlorine gas in the strongly acidic water with the dilution water to increase the amount of hypochlorous acid in the water and dilute the strongly acidic water to increase the pH.
8. This is to make the aqueous solution of hypochlorous acid having a concentration of 2 to 200 ppm. Therefore, the anode chamber side discharge pipe 12 and the dilution water supply pipe 20
The downstream side of the connection point of b is pH4-8, concentration 2-200ppm
Is a hypochlorous acid water drainage pipe B.

In the embodiment shown in the figure, the dilution water supply pipe 20a for strong alkaline water and the dilution water supply pipe 20b for strong acid water are formed by bifurcating the dilution water main pipe 20 branched from the water supply main pipe 13. . The flow switches 22, 24 provided in the dilution water supply pipes 20a, 20b detect the flow of water and are used as an electrolysis ON / OFF control signal for the electrolytic cell 9.

In the embodiment of FIG. 1, the above-described structure supplies an aqueous chloride salt solution of a predetermined concentration supplied from the water supply pipe circuit 10 to the diaphragm electrolysis tank 9 for electrolysis, thereby forming the cathode chamber side discharge pipe. The strong alkaline water having a pH of 10.5 or more is discharged from 11 and the raw water from the dilution water supply pipe 20a is mixed with the strong alkaline water to adjust to a strong alkaline water having a pH of 10.5 to 13.5. Strongly acidic water is discharged from the anode chamber side discharge pipe 12, and the strongly acidic water is diluted with a dilution water supply pipe 2.
The raw water from Ob is mixed and the hypochlorite sterilized water having a pH of 4 to 8 is discharged. The concentration of the hypochlorous acid sterilizing water is preferably adjusted to 2 to 200 ppm depending on the mixing amount of the aqueous chloride solution or the dilution water.

According to the present invention, the raw water is diluted with the water in the anode chamber side discharge pipe 12 to produce sterilized hypochlorous acid water having a pH of 4-8. A part of the strong alkaline water before or after the dilution is mixed with the water before or after the mixing of the dilution water in the anode chamber side discharge pipe 12 to finally adjust the pH of the hypochlorite water to pH 4 to 8. It may be adjusted. For this reason, in the embodiment of FIG. 1, a strong alkaline water tank 25 is interposed in the cathode chamber side discharge pipe 11 ′ after dilution, and the anode chamber side discharge pipe 12 ′ after dilution from this tank 25.
And a part of the strong alkaline water is mixed with the diluted water of the anode chamber side discharge pipe 12 ′ by the pump 27.

The water discharged from the anode chamber side discharge pipe 12 is p
When H is low, chlorine gas is included. For this reason, in the embodiment of FIG. 1, the gas absorption tank 28 is interposed in the anode chamber side discharge pipe 12 after dilution. As a preferred embodiment, a hypochlorous acid concentration detector 29 is provided in the anode chamber side discharge pipe 12 '.

The strongly acidic water discharged from the anode chamber side discharge pipe 12 is mixed with a predetermined amount of a predetermined amount of dilution water to produce a hypochlorite sterilizing water having a desired pH and a desired flow rate. However, the strongly acidic water required for this may be a part of the amount generated from the anode chamber 8, and in this case, the remaining strongly acidic water needs to be drained out of the system. For this reason, in the apparatus shown in the drawing, as a more preferred embodiment, a branch drain pipe 30 for draining a part of the strongly acidic water of the anode chamber drain pipe 12 out of the system.
Is provided. The branch drain pipe 30 is connected to the anode chamber side drain pipe 1.
It is branched from 2 via a switching valve 31, and becomes a strongly acidic water drainage pipe C.

Since the strongly acidic water drained from the branch drain pipe 30 contains hypochlorous acid and chlorine gas, it is not preferable to drain it as it is. Therefore, still another embodiment of the present invention relates to a system of the branch drainage pipe 30 in which a strong acid water passing through the branch drainage pipe 30 or a strong acid water drained from the branch drainage pipe 30 is hypochlorous acid and chlorine gas. Is provided with a reducing device 32 for reducing the hydrogen to hydrochloric acid.

As a preferred first embodiment of the reduction device 32 (reduction device 32a), as shown by reference numeral 32a in FIG. 2, a pipeline through which strongly acidic water passes (a branch drain pipe 30 in the illustrated embodiment). A reaction tank 33 and a catalyst 34 such as a platinum group are disposed in the reaction tank 33, and a hydrogen gas supply pipe 35 for sending hydrogen gas is connected to the reaction tank 33. By reacting the acid and chlorine gas with the hydrogen gas from the hydrogen gas supply pipe 35, the hypochlorous acid and the chlorine gas are reduced and oxidized. That is,
Hypochlorous acid (HClO) and chlorine gas (Cl
₂ ) reacts with hydrogen gas (H ₂ ) to form hydrochloric acid (HCl).

The cathode tube side discharge pipe 1 of the device according to the present invention
Since the strong alkaline water passing through 1 contains hydrogen gas, more preferably, the cathode chamber side discharge pipe 11 is provided with a hydrogen gas separating portion 36 for extracting hydrogen gas from the strong alkaline water, A hydrogen gas supply pipe 35 is piped from the section 36 to the reaction tank 33, and is fed through a pump 37 using hydrogen gas in strong alkaline water.
This configuration is reasonable because hydrogen gas for reduction can be self-supplied.

As shown in FIG. 2, the second preferred embodiment of the reduction device 32 (reduction device 32b) is a platinum storage device for receiving strongly acidic water from the branch drain 30 in the vicinity of an ultraviolet lamp 39. And an ultraviolet irradiation device 41 surrounded by a cover of a catalyst 40 such as an aromatic group.
1 is provided with a circulation path 42 for circulating the water in the water storage tank 38 and discharging the water in the form of a mist (shower) from above the water surface.

When the strongly acidic water is irradiated with ultraviolet light, the energy of the ultraviolet light under the catalyst 40 reduces the hypochlorous acid in the strongly acidic water to convert it into hydrochloric acid. After being dissolved into the liquid by the shower water discharge of 42 to become hypochlorous acid, it is reduced by the ultraviolet energy below the catalyst 40 as described above,
It becomes hydrochloric acid. In this case, water may be supplied from the water supply pipe 43 to the water storage tank 38 in order to efficiently dissolve the chlorine gas into the liquid. As shown by the broken line in the figure, the water supply pipe 43 may be connected from the raw water supply main pipe 13 of the apparatus of the present invention. Further, a gas venting device 44 using activated carbon or the like may be provided in the upper lid of the water storage tank 38 to discharge the gas from which the chlorine component has been removed to the outside. In the drawing, reference numeral 45 is a water level sensor.

Another embodiment of the reduction device 32 (reduction device 32
As the device c), a device may be used in which a reducing agent aqueous solution 46 such as L-ascorbic acid, ethyl alcohol, methyl alcohol or the like is pumped and added to the water to be reduced or sprayed in a shower. Also. The reducing agent aqueous solution 46 may be mixed with the treated water in the water storage tank 38, or may be added to the water in the drain pipe 47 of the water storage tank 38 as shown in the figure.

Each of the above reduction devices 32a, 32b, 32c
May be used alone or in combination of two or more. The embodiment of FIG. 2 combines the above three types of reduction devices 32a, 32b, and 32c. In this case, the reducing agent aqueous solution 46 is added to the water reduced by the first and second reduction devices 32a and 32b. Alternatively, the reaction tank 33 and the catalyst 34 of the first reduction device 32a may be interposed in the circulation path 42 of the water tank 38. Further, the same reduction devices 32a, 32 as in FIG.
b, 32c may be used.

The washing / sterilizing water adjusting device 2 of the embodiment shown in FIGS. 1 and 2 converts a part of the raw water from the raw water supply main pipe 13 into a high-concentration chloride salt aqueous solution and electrolyzes the strong alkaline water. The water and the strongly acidic water are diluted with the raw water from the raw water supply main 13, and the whole amount of the raw water in the raw water supply main 13 is electrolyzed into a relatively low-concentration chloride salt aqueous solution, and the electrolysis generated is performed. Without diluting water, pH 10.5-
13.5 strong alkaline water is discharged, and the anode chamber side discharge pipe 12 is discharged.
From which hypochlorite sterilized water having a pH of 4 to 8 can be discharged.

For this reason, the switching valve 4 is connected to the dilution water supply pipe 20.
A pipe 49 is connected to the water supply side of the diaphragm electrolyzer 9 via the pipe 8, and the raw water flowing to the dilution water supply pipe 20 by the switching operation of the switching valve 48 flows to the water supply side of the diaphragm electrolyzer 9, and the water supply main pipe 1
The entire amount of raw water from No. 3 is electrolyzed in the diaphragm electrolyzer 9 as a chloride salt aqueous solution. This line 49 is preferably provided with a flow control valve 50 and a flow switch 51.

FIG. 3 shows a cleaning / sterilizing apparatus according to the present invention using another cleaning / sterilizing water adjusting device. The same reference numerals as those in FIGS. 1 and 2 denote the same members. This has a water supply pipe circuit 10 for a chloride salt aqueous solution on one side of a diaphragm electrolyzer 9 and a cathode chamber side discharge pipe 11 and an anode chamber side discharge pipe 12 on the other side.
A continuous-flow type isolated membrane electrolysis device 9 having: and a water supply pipe 53 of a chloride salt aqueous solution on one side of a non-diaphragm electrolysis tank 52;
A continuous flow-type non-diaphragm electrolysis water conditioning device 55 having an electrolysis water discharge pipe 54 on the other side is provided.

A diluted water supply pipe 20a is connected to the cathode chamber side discharge pipe 11 of the diaphragm electrolyzer 9 in the same manner as described above, and the strong alkaline water discharged from the cathode chamber side discharge pipe 11 is diluted water supply pipe. Diluted with raw water supplied from 20a to pH10.
It is adjusted to a strong alkaline water of 5 to 13.5. In FIG. 3, the dilution water supply pipe 20b is also connected to the anode chamber side discharge pipe 12 in the same manner as described above, but this is not necessarily essential.

On the other hand, the diluted water supply pipe 20c is connected to the electrolyzed water discharge pipe 54 of the diaphragmless electrolysis water conditioning apparatus 55, and the hypochlorous acid water generated in the diaphragmless electrolytic tank 52 is diluted with raw water. It has become.

The apparatus of the embodiment shown in FIG. 3 further uses the acidic circuit discharged from the anode chamber side discharge pipe 12 of the diaphragm electrolyzer 9 for the water circuit of the diaphragmless electrolysis water conditioning apparatus 55, that is, the diaphragmless membrane. Discharge pipe 54 from electrolytic cell 52 or non-diaphragm electrolytic cell 5
2 is supplied to and mixed with the water supply pipe 53 to adjust the pH of the electrolyzed water discharged from the non-diaphragm electrolytic cell 52 to hypochlorous acid disinfecting water having a pH of 4 to 8; Hypochlorous acid concentration at a specified value (2-200 ppm)
And a pH / concentration adjusting tube 56 for adjusting the pH.

Therefore, in FIG. 3, the pH / concentration adjusting pipe 56 is connected from the anode chamber side discharge pipe 12 to the discharge pipe 54 of the non-diaphragm electrolysis water regulator 55. This pH / concentration adjusting tube 5
Reference numeral 6 may be a conduit for supplying an appropriate amount of strong acid water stored in the tank 73 through a metering pump as shown in FIG. A pipe supplied by using the pipe 56 may be used. Of course, both may be used together as shown in FIG. Although illustration is omitted, the pH / concentration adjusting tube 56 is not limited to being connected to the discharge tube 54 of the diaphragm-free electrolytic cell 52,
Is added to the aqueous chloride salt solution supplied to the diaphragm-free electrolytic cell 52 by adding an appropriate amount of the strong acid water in the diaphragm-containing electrolytic cell 9 to drain the water from the diaphragm-free electrolytic cell 52. The pH and concentration of the aqueous chlorite solution may be adjusted.

The apparatus of the embodiment shown in FIG. 3 is also generally similar to the apparatus shown in FIGS. Desired pH
If necessary, the entire amount of the raw water in the raw water supply main pipe 13 is supplied together with a chloride salt aqueous solution to perform electrolysis, and the desired strong alkaline water and hypochlorous water are diluted without diluting the water after the electrolysis. It is configured so that chloric acid sterilizing water can be generated.

For this reason, the apparatus shown in FIG. 3 is connected to the diluting water supply pipes 20a, 20b, 20c from the common water supply main pipe 13 to the respective water supply sides of the diaphragm electrolyzer 9 and the non-diaphragm electrolyzer 52. The pipes 58, 59 are connected, and the raw water supply pipes 58, 59 and the dilution water supply pipes 20a, 20b,
Each of the opening / closing control valve mechanisms 60, 61, 62, 63, and 64 selectively opens and closes. In the embodiment of FIG. 3, these opening / closing control valve mechanisms 60 to 64 are exemplified by solenoid valves, but are not limited thereto.

Thus, the open / close control valve mechanisms 60 and 61 of the raw water supply pipes 58 and 59 are closed, and the dilution water supply pipes 20a and 20a are closed.
When the opening / closing control valve mechanisms 62, 63, 64 of b, 20c are opened, a high-concentration aqueous chloride salt solution is electrolyzed in the diaphragm electrolyzer and the non-diaphragm electrolyzer, and each electrolyzed water is diluted with the dilution water feed pipes 20a, 20b.
Ob, diluted by raw water from 20c.

On the other hand, the opening / closing control valve mechanisms 60, 61 of the raw water supply pipes 58, 59 are opened, and the dilution water supply pipes 20a, 20b,
When the opening / closing control valve mechanism 62, 63, 64 of 20c is closed, the electrolyzed water is not diluted, and the whole amount of water in the water supply main pipe 13 is mixed with the chloride salt aqueous solution to be electrolyzed.

Similarly, each of the opening / closing control valve mechanisms 60 to 60
By combining the opening / closing control of 64, for example, in the non-diaphragm electrolytic cell 52, the water of the raw water supply pipe 59 is combined with the aqueous solution of chloride salt for electrolysis, and the electrolyzed water is not diluted.
The diaphragm electrolyzer 9 can perform various kinds of electrolyzing operations such as electrolyzing a high concentration aqueous chloride salt solution to dilute only strong alkaline water. The raw water supply pipe 59 and the dilution water supply pipe 20c
Can be used as switches for controlling ON and OFF of the diaphragm-free electrolytic cell 52.

FIG. 4 shows another washing / sterilizing water conditioning device 2 using a diaphragm electrolysis water conditioning device and a non-diaphragm electrolysis water conditioning device.
This shows an embodiment in which water for cleaning and sterilization is adjusted by connecting the anode chamber side discharge pipe 12 of the diaphragm electrolyzer 9 to the water supply pipe 53 of the diaphragmless electrolysis water regulator 55. Then, strongly acidic water having a pH of 1 to 3.5 or a mixed water of the strongly acidic water and an aqueous solution of a chloride salt such as sodium chloride produced in the diaphragm electrolytic cell 9 is electrolyzed in the non-diaphragm electrolytic cell 52 to obtain a pH of 4 to 8.
The hypochlorite sterilizing water is adjusted. In addition, the apparatus shown in FIG.
It has a structure in which a strong alkaline water of 10.5 to 13.5 is generated, and is supplied as it is to the dishwashing water without dilution with raw water. Otherwise, the structure can be the same as that of the apparatus shown in FIGS.

The diaphragm electrolyzer 9 shown in FIGS. 1 and 2 is a type of electrolyzer in which the polarity of the electrode is reversed to perform reverse electrolysis in order to dissolve and wash calcium precipitated in the cathode chamber 7.
Therefore, the merging conduit 68 is connected from the cathode chamber side discharge pipe 11 to the anode chamber side discharge pipe 12 via the switching valve 67, and the drain 70 is connected via the switching valve 69 from the branch drain pipe 30.
There is provided a drain pipe 71 for draining water. Accordingly, the cathode chamber side discharge pipe 11 is connected to the anode chamber side discharge pipe 1 through the switching valve 67.
2, the anode chamber side discharge pipe 12 is connected to the branch drain pipe 30 via the switching valve 31, and further connected to the drain 70 via the switching valve 69. Drained to 70.

On the other hand, the diaphragm electrolyzer 9 shown in FIGS. 3 and 4 reverses the polarity of the electrode at predetermined time intervals to perform electrolytic water adjustment, and dissolves and cleans the precipitated calcium. The flow path which is switched between the cathode chamber side discharge pipe 11 and the anode chamber side discharge pipe 12 in conjunction with the polarity change of the electrode so that the polarity of the electrolyte does not affect the extraction pipes of the strong alkaline water and the strong acid water. A switching valve device 72 is provided. For the washing water circuit, the structure of the apparatus of FIG. 3 may be applied to the apparatus of FIGS. 1 and 2, and the structure of the apparatus of FIGS.
May be applied to the above-mentioned device.

In the figure, symbol P indicates a metering pump, M indicates a motor valve, and SOL indicates a solenoid valve.

Thus, the washing / sterilizing water adjusting device 2 of the dishwashing / sterilizing device shown in the embodiment of FIGS. 1 to 4 adjusts the pH of strong alkaline water of 10.5 to 13.5 and discharges the drainage line A. And stored in an alkaline water tank 74 from
Hypochlorous acid sterilized water having a pH of 4 to 8 is adjusted and stored in a hypochlorous acid water tank 75 from a drainage pipe B.
The highly acidic water of 3.5 is adjusted and stored in the strongly acidic water tank 76 from the drainage pipe C.

PH adjusted by washing water adjusting device 2
The strong alkaline water having a pH of 5 to 13.5, the hypochlorous acid water having a pH of 4 to 8 and the strong acid water having a pH of 1 to 3.5 are supplied to respective supply pipes 77,
Water is supplied to the dishwashing tank 1 through pumps 78 and 79.

The dishwashing tank 1 is a tank for performing washing and sterilization by spraying the above various kinds of washing and sterilizing water on the tableware 80 stored therein. In the embodiment shown in the drawing, a belt conveyor on which the tableware 80 is placed and moved. Etc., and the nozzles 82, 83, 84 of the three types of water supply pipes 77, 78, 79 are assembled so as to face the tableware 80 on the conveying means 81.

The washing of the tableware 80 is performed by removing the jet nozzle 82 of the strong alkaline water upstream of the jet nozzle 83 of the hypochlorous acid water so that after the oil is washed off with the strong alkaline water and sterilized with the hypochlorous acid solution, the tableware 80 is cleaned. Face to the side. pH 10.5 ~
When dishwashing is performed with 13.5 strong alkaline water, calcium precipitated from the washing water adheres to the surface of the tableware 80. Since the water spray from the injection nozzle 84 of the strongly acidic water supply line is for dissolving and washing away this calcium, the injection nozzle 84 is formed by the injection nozzle 82 of the strong alkaline water and the injection nozzle 83 of the hypochlorous acid water. Place between.

The dishwashing tank 1 is provided with respective spray nozzles 82, 8
A strong alkaline water receiving tank 85, a strongly acidic water receiving tank 86, and a hypochlorous acid water receiving tank 8 corresponding to each washing / sterilizing water are provided below the lower parts 3, 84.
7 and each receiving tank 85, 86, 87
The water overflowing from the
And then neutralized, and then drained to a drain 89.

A part of the strong alkaline water supplied from the strong alkaline water supply pipe 77 is supplied to the strong alkaline water receiving tank 8 through the pipe.
5 is supplied to the downstream water storage section. Further, since the water in the downstream water storage portion of the strong alkaline water receiving tank 85 retains the drainage cleaning ability of tableware, in the embodiment shown in the drawing, the water can be supplied to the strong alkaline water injection nozzle 82 via the circulation path 90. It is.

The dishwashing tank 1 is provided with a nozzle 91 for injecting steam or hot water into the dishware 80 as a final stage of washing. The nozzle 91 communicates with a pipe 92 branched from the raw water supply pipe 13, and the pipe 92 has a heating unit 93.
Is interposed.

In the present invention, the tableware 80 in the dishwashing tank 1 is thus washed with greasy water having a pH of 10.5 to 13.5 and then washed with strong acidic water having a pH of 1 to 3.5 to remove calcium, and then washed with a pH of 4 to 3.5. After sterilizing with ~ 8 hypochlorous acid water,
Steam or hot water is sprayed and sent out from the dishwashing tank 1.

[0064]

[Effect] The present invention simultaneously produces a plurality of types of washing water of strong alkaline water, hypochlorous acid sterilizing water, and strongly acidic water with a single washing water adjusting device, and performs primary degreasing and secondary washing of tableware. Since the sterilization and washing can be continuously performed along the line, the efficiency of washing and sterilizing tableware is remarkably improved.

In particular, when adjusting the strong alkaline water and the hypochlorous acid water, a relatively small amount of a high-concentration chloride salt aqueous solution is electrolyzed to generate strong alkaline water and hypochlorous acid water, and the dilution water is used. Since the amount of strong alkaline water and hypochlorous acid water is increased by mixing, a relatively small capacity of the electrolytic cell is sufficient, and the cost can be reduced. Further, the pH and concentration can be finely adjusted by adjusting the mixing of the dilution water. Further, since the high-concentration aqueous solution is electrolyzed, the conductivity is increased, and the electrolysis efficiency is significantly improved.

Further, since the pH, concentration, etc. can be adjusted by using the water conventionally discarded to the drain, waste water is reduced, and the adjustment of pH, concentration is further facilitated.

The extra strongly acidic water is safe because it is reduced to hydrochloric acid.

Since the apparatus can be selectively used for electrolysis of a high-concentration aqueous solution and electrolysis of the entire amount of raw water, various uses can be made according to the purpose.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an apparatus according to another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of an apparatus according to another embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of an apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dishwashing tank 2 ... Washing / sterilization water adjustment apparatus 3 ... Washing water supply means 4 ... Negative electrode 5 ... Positive electrode 6 ... Electrolytic membrane 7 ... Cathode chamber 8 ... Anode chamber 9 ... Separated membrane electrolytic tank 10 ... 11, 11 '... Cathode chamber side discharge path 12, 12' ... Anode chamber side discharge path 13 ... Raw water supply main pipe 14 ... Pipe line 15 ... Tank 16 ... Tank 17 ... Pipe line 18 ... Metering pump 19 ... Flow rate ratio regulating valve 20a, 20b, 20c: Dilution water supply pipe 21, 23 ... Flow control valve 22, 24 ... Flow switch 25 ... Strong alkaline water tank 26 ... Pipe line 27 ... Pump 28 ... Gas absorption tank 29 ... Concentration detection device 30 ... Branch drainage Pipe 31 ... Switching valve 32, 32a, 32b, 32c ... Reducing device 33 ... Reaction tank 34 ... Catalyst 35 ... Hydrogen gas supply pipe 36 ... Hydrogen gas separation unit 37 ... Pump 38 ... Water tank 39 ... Ultraviolet light 40 ... Catalyst 41 ... External line irradiation device 42 ... Circulation path 43 ... Water supply pipe 44 ... Degassing device 45 ... Water level sensor 46 ... Reducing agent aqueous solution 47 ... Drain pipe 48 ... Switching valve 49 ... Pipe line 50 ... Flow control valve 51 ... Flow switch 52 ... No diaphragm Electrolyzer 53 ... Water supply pipe 54 ... Electrolyzed water discharge pipe 55 ... Non-diaphragm electrolytic water conditioning apparatus 56 ... pH / concentration adjustment pipe 57 ... Switching valve 58, 59 ... Raw water supply pipe 60-64 ... Opening / closing control valve mechanism 65, 66 ... Flow switches 67, 69 Switch valve 68 Merging line 70 Drain 71 Drainage line 72 Flow path switching device 73 Strong acid water tank 74 Strong alkaline water tank 75 Hypochlorous acid water tank 76 Strong acid Aqueous water tank 77, 78, 79 ... supply line 80 ... tableware 81 ... conveying means 82, 83, 84 ... injection nozzle 85 ... strong alkaline water receiving tank 86 ... strong acidic water receiving tank 87 ... hypochlorous acid water Bath 88 ... merging tank 89 ... Drain 90 ... circulation path 91 ... nozzle 92 ... conduit 93 ... heating section

Claims (9)

[Claims] 1. An electrolysis of a chloride salt aqueous solution in a diaphragm electrolyzer to produce strongly acidic water and strongly alkaline water having a pH of 1 to 3.5,
The strong alkaline water is diluted with water to have a pH of 10.5 to 13.
While adjusting to 5 strong alkaline water, the strong acid water is diluted with water to adjust to pH 4 to 8 hypochlorous acid sterilized water,
A method for washing and sterilizing tableware, comprising washing tableware with the strong alkaline water having a pH of 10.5 to 13.5 and then sterilizing the tableware with the hypochlorite sterilized water. 2. An aqueous solution of a chloride salt is electrolyzed in a diaphragm electrolyzer to produce strongly acidic water and strongly alkaline water having a pH of 1 to 3.5, and the strongly alkaline water is diluted with water to have a pH of 10.5 to 13. .5
And an aqueous electrolyzed chloride salt solution in a non-diaphragm electrolytic cell or a dilute aqueous solution thereof mixed with the strongly acidic water generated by the electrolysis with a diaphragm to adjust the pH to 4-8. Adjust to chlorite sterilized water and adjust the pH
A method for washing and sterilizing tableware, comprising washing tableware with strongly alkaline water of 10.5-13.5, and then sterilizing the tableware with the hypochlorous acid sterilized water. 3. An aqueous chloride salt solution is electrolyzed in a diaphragm electrolyzer to form a strong alkaline water having a pH of 10.5 to 13.5 and a pH of 1 to 3.
5 and a pH of 1 to 3.5.
Of strongly acidic water or a mixture of strongly acidic water having a pH of 1 to 3.5 and an aqueous solution of a chloride salt in a non-diaphragm electrolytic cell to have a pH of 4 to 8
Adjusted to the hypochlorous acid sterilized water, and the pH of 10.5 to 1
A method of washing and sterilizing tableware, comprising washing dishes with strongly alkaline water of 3.5, and then sterilizing the tableware with the hypochlorous acid sterilized water. 4. A part of strongly acidic water having a pH of 1 to 3.5 electrolyzed in a diaphragm electrolyzer adheres to dishes after neutralization of strong alkaline water and / or washing with strong alkaline water used for washing the dishes. 4. The method for washing and sterilizing tableware according to claim 1, further comprising dissolving and removing calcium and astringent. 5. A washing water adjusting device for simultaneously producing a strong alkaline water having a pH of 10.5 to 13.5 and a hypochlorous acid sterilizing water having a pH of 4 to 8, and the strong alkaline water produced by the washing water adjusting device. A washing water supply line for separately supplying hypochlorous acid water, and a dishwashing tank provided with a nozzle communicating with each washing water supply line, and the washing water adjusting device is provided through an electrolytic diaphragm. A water supply pipe circuit for a chloride salt aqueous solution is provided on one side of the diaphragm electrolytic cell partitioned into a cathode compartment and an anode compartment, and a cathode compartment side discharge pipe and an anode compartment side discharge pipe are provided on the other side. Electrolytes the chloride salt solution supplied from the furnace and discharges strongly alkaline water from the discharge pipe on the cathode chamber side, and discharges strongly acidic water containing hypochlorous acid and chlorine gas from the discharge pipe on the anode chamber side. A water device; a diluent for supplying and diluting raw water to strong alkaline water in the cathode chamber side discharge pipe Water supply pipe and; cleaning and sterilizing apparatus for tableware, characterized by comprising; a diluting water supply pipe for dilution by supplying raw water to the anode chamber side exhaust pipe 6. A washing water adjusting device for simultaneously producing a strong alkaline water having a pH of 10.5 to 13.5 and a hypochlorous acid sterilizing water having a pH of 4 to 8, and the strong alkaline water generated by the washing water adjusting device. A washing water supply pipe for separately supplying hypochlorous acid water, and a dishwashing tank provided with a nozzle communicating with each washing water supply pipe, wherein the washing water adjusting device is provided with a cathode through an electrolytic diaphragm. A water supply pipe circuit for the aqueous solution of chloride salt is provided on one side of the diaphragm cell separated into a chamber and an anode chamber, and a discharge pipe on the cathode chamber side and an anode chamber side discharge pipe are provided on the other side. Electrolyzed chloride salt solution to discharge strong alkaline water from the discharge pipe on the cathode chamber side and discharge strong acid water containing hypochlorous acid and chlorine gas from the discharge pipe on the anode chamber side And dilution water for supplying and diluting raw water to the strong alkaline water in the discharge pipe on the cathode chamber side A water pipe; a non-diaphragm electrolysis water conditioning apparatus having a water supply pipe for a chloride salt aqueous solution on one side of a non-diaphragm electrolytic cell, electrolyzing a chloride salt aqueous solution supplied from the water supply pipe, and draining it from a discharge pipe; Connected to the water circuit of the diaphragmless electrolysis water conditioning device from the anode chamber side drainage circuit of the diaphragm electrolysis water conditioning device,
A part of strong acid water generated from the diaphragm electrolyzer is supplied to a drainage circuit or a water supply circuit of a non-diaphragm electrolyzer for adjusting pH and concentration of hypochlorous acid. Tableware washing / sterilizing apparatus characterized by comprising 7. A washing water adjusting device for simultaneously producing a strong alkaline water having a pH of 10.5 to 13.5 and a hypochlorite disinfecting water having a pH of 4 to 8, and the strong alkaline water generated by the washing water adjusting device. A washing water supply pipe for separately supplying hypochlorous acid water, and a dishwashing tank provided with a nozzle communicating with each washing water supply pipe, wherein the washing water adjusting device is provided with a cathode through an electrolytic diaphragm. A water supply pipe circuit for the aqueous solution of chloride salt is provided on one side of the diaphragm cell separated into a chamber and an anode chamber, and a discharge pipe on the cathode chamber side and an anode chamber side discharge pipe are provided on the other side. Electrolyzed chloride salt solution to discharge strong alkaline water from the discharge pipe on the cathode chamber side and discharge strong acid water containing hypochlorous acid and chlorine gas from the discharge pipe on the anode chamber side And strongly acidic water prepared by this diaphragm electrolysis water conditioning apparatus or this strongly acidic water Cleaning and sterilizing apparatus for dishes, characterized by comprising; by electrolytic mixing water product salt solution and the diaphragm-free electrolytic water conditioner apparatus for generating hypochlorous acid sterilizing water 8. The apparatus for cleaning and sterilizing tableware according to claim 6, wherein a dilution water supply pipe is connected to a drain pipe of the non-diaphragm electrolytic cell. 9. The washing water adjusting device has a strong acid water branch drain pipe branched from an anode chamber side discharge pipe of a diaphragm electrolyzer, and a strong acid water between the branch drain pipe and the dishwashing tank. The supply line is provided, and a part of the strongly acidic water in the discharge pipe on the anode chamber side of the diaphragm electrolytic cell is supplied to the dishwashing tank. Tableware cleaning and sterilizing equipment