JP4182190B1 - Electrolyzed water treatment method and electrolyzed water treatment apparatus - Google Patents

Abstract

An electrolyzed water treatment method and an electrolyzed water treatment apparatus capable of safely treating chlorine gas without the need for maintenance for adsorbent replacement.
An electrolyzer 3 electrolyzes an aqueous chloride salt solution in a water storage container 2 to generate strong acidic electrolyzed water and strong alkaline electrolyzed water. The strong alkali container 4 includes a drain port 22 having an on-off valve 21 to store strong alkaline electrolyzed water. The strong acid container 5 can be sealed, has a drain 26 having an on-off valve 25, and stores strongly acidic electrolyzed water. The vacuum pump 7 collects chlorine gas generated from the strongly acidic electrolyzed water stored in the strong acid container 5 from the strong acid container 5. The processing container 6 includes a drain port 29 having an on-off valve 28, receives a part of strong alkaline electrolyzed water from the drain port 22 of the strong alkali container 4, and dissolves and collects the recovered chlorine gas therein. A drainage container 8 receives drainage from the strong alkali container 4, the strong acid container 5, and the processing container 6.
[Selection] Figure 1

Description

  The present invention relates to an electrolyzed water treatment method and an electrolyzed water treatment apparatus.

  In recent years, strongly acidic water has been used for sterilization and disinfection. Strongly acidic water can be obtained by electrolyzing an electrolyte solution such as water, but is generally generated by electrolyzing a chloride salt aqueous solution using sodium chloride or the like as an electrolyte. When the aqueous chloride salt solution is electrolyzed, chlorine gas is generated from the strongly acidic electrolyzed water produced at the anode. Chlorine gas has an irritating odor and is highly toxic, such as damaging the respiratory tract when inhaled. In the conventional electrolyzed water treatment, the generated chlorine gas is adsorbed on an adsorbent such as activated carbon and discarded (for example, see Patent Document 1).

JP 2003-53139 A

  However, in the method of adsorbing chlorine gas on activated carbon or the like, there is a problem that maintenance for exchanging the used adsorbent is expensive and troublesome.

  The present invention has been made paying attention to such problems, and provides an electrolyzed water treatment method and an electrolyzed water treatment apparatus capable of safely treating chlorine gas without the need for maintenance of adsorbent replacement. It is an object.

In order to achieve the above object, an electrolyzed water treatment method according to the present invention is an electrolyzed water treatment method for treating strongly acidic electrolyzed water and strong alkaline electrolyzed water obtained by electrolyzing a chloride salt aqueous solution. A first step of dissolving chlorine gas generated from the strongly acidic electrolyzed water in a part of the strong alkaline electrolyzed water to form chlorine-dissolved water, the chlorine-dissolved water, the strongly acidic electrolyzed water, and the strong alkali after neutralized by mixing with the other portion of the electrolytic water, and a second step of discarding, characterized in that it has.

In the electrolyzed water treatment method according to the present invention, the chlorine gas generated from the strongly acidic electrolyzed water is dissolved in a part of the strongly alkaline electrolyzed water, so that the chlorine gas can be treated safely. In addition, there is no need for maintenance to replace the used adsorbent, and the cost and labor are not required.
When mixing and neutralizing chlorine-dissolved water in which chlorine gas is dissolved in a part of strong alkaline electrolyzed water and strongly acidic electrolyzed water and the other part of strong alkaline electrolyzed water, Strong alkaline electrolyzed water can also be safely treated and discarded. Strongly acidic electrolyzed water and strongly alkaline electrolyzed water may be used for sterilization, disinfection, washing, etc. before neutralization. Any aqueous chloride salt solution may be used, for example, an aqueous sodium chloride solution.

  In the electrolyzed water treatment method according to the present invention, the strongly acidic electrolyzed water preferably has a pH of 2 to 4, and the strongly alkaline electrolyzed water preferably has a pH of 10 to 12. In this case, the bactericidal effect of strongly acidic electrolyzed water is high, and the protein washing effect of strongly alkaline electrolyzed water is also high.

An electrolyzed water treatment device according to the present invention is an electrolyzed water treatment device for treating strongly acidic electrolyzed water and strong alkaline electrolyzed water obtained by electrolyzing a chloride salt aqueous solution, and is a wastewater having an on-off valve. A strong alkali container for storing the strongly alkaline electrolyzed water provided with a mouth, and a sealable water reservoir for storing the strongly acidic electrolyzed water provided with an exhaust port and a drain port having an on-off valve. A container for strong acid and a drain port having an on-off valve are provided, and a treatment container for receiving and storing the strong alkaline electrolyzed water from the drain port of the strong alkali container and discharged from the exhaust port of the strong acid container. And a drain that discharges chlorine gas into the strong alkaline electrolyzed water in the processing container, and drains from the drain of the strong alkali container, the drain of the strong acid container, and the drain of the processing container. Drainage container for , Characterized in that it has.

The electrolyzed water treatment apparatus according to the present invention can implement the electrolyzed water treatment method according to the present invention. In the electrolyzed water treatment apparatus according to the present invention, chlorine gas generated from strongly acidic electrolyzed water stored in a strong acid container is dissolved in a part of strong alkaline electrolyzed water inside the treatment container, so that chlorine gas can be safely used. Can be processed. In addition, there is no need for maintenance to replace the used adsorbent, and the cost and labor are not required. By sealing the container for strong acid and discharging the chlorine gas generated from the strongly acidic electrolyzed water into the strong alkaline electrolyzed water in the treatment container, it is possible to prevent toxic chlorine gas from leaking and safety Is expensive.
In drainage containers, strong alkaline electrolyzed water stored in strong alkali containers, strongly acidic electrolyzed water stored in strong acid containers, and chlorine-dissolved water stored in treatment containers are contained inside the drainage container. Since it can be mixed and neutralized, strong acidic electrolyzed water and strong alkaline electrolyzed water can be safely treated and discarded together with chlorine-dissolved water.

  The strongly acidic electrolyzed water stored in the strong acid container and the strong alkaline electrolyzed water stored in the strong alkali container may be used for sterilization, disinfection, washing, etc. before being drained into the drainage container. Any aqueous chloride salt solution may be used, for example, an aqueous sodium chloride solution. The on / off valves of the drains of the strong alkali container, strong acid container, treatment container, and drainage container may be electromagnetic valves, and may be manually or automatically openable. You may have the control part for controlling opening and closing of the opening-and-closing valve of the drain outlet of each container automatically.

  ADVANTAGE OF THE INVENTION According to this invention, the electrolyzed water processing method and electrolyzed water processing apparatus which can process chlorine gas safely can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an electrolyzed water treatment method and an electrolyzed water treatment apparatus according to an embodiment of the present invention.
As shown in FIG. 1, an electrolyzed water treatment apparatus 1 includes a water storage container 2, an electrolysis apparatus 3, a strong alkali container 4, a strong acid container 5, a treatment container 6, a vacuum pump 7, and a drainage device. And a container 8. The electrolyzed water treatment method of the embodiment of the present invention can be performed by the electrolyzed water treatment apparatus 1.

  The water storage container 2 includes an anode chamber 12 and a cathode chamber 13 separated by an electrolysis diaphragm 11. The anode chamber 12 and the cathode chamber 13 are provided with drain ports 16 and 17 having opening / closing valves 14 and 15, respectively. The electrolyzer 3 includes an anode 18 and a cathode 19, the anode 18 is disposed in the anode chamber 12, and the cathode 19 is disposed in the cathode chamber 13. The electrolyzer 3 is connected to a power source 20, and electrolyzes water in the water storage container 2 to generate strong acidic electrolyzed water in the anode chamber 12 and strong alkaline electrolyzed water in the cathode chamber 13. Yes.

  The strong alkali container 4 is a container for storing strongly alkaline electrolyzed water in the cathode chamber 13, and includes a drain port 22 having an on-off valve 21. The strong alkali container 4 is arranged to receive the drainage from the drainage port 17 of the cathode chamber 13. The strong alkali container 4 has two branch pipes 23 and 24 connected to the on-off valve 21, and when draining from the drain port 22, which of the branch pipes 23 and 24 is drained by the on-off valve 21. It can be selected.

  The strong acid container 5 is a container for storing strongly acidic electrolyzed water in the anode chamber 12, and includes a drain port 26 having an on-off valve 25. The strong acid container 5 has a lid 27 and can be sealed. The strong acid container 5 receives the waste water from the drain port 16 of the anode chamber 12 inside the lid 27 below.

  The processing container 6 is sealed and has a drain port 29 having an on-off valve 28. One branch pipe 23 of the strong alkali container 4 is connected to the processing container 6 so as to receive the waste water from the drain 22 of the strong alkaline water. The vacuum pump 7 has a recovery pipe 30 that communicates with the interior below the lid 27 of the strong acid container 5 and an exhaust pipe 31 that communicates with the inside of the processing container 6. The vacuum pump 7 recovers chlorine gas generated from the strongly acidic electrolyzed water stored in the strong acid container 5 from the inside of the strong acid container 5 through the recovery pipe 30 and discharges it from the exhaust pipe 31 to the inside of the processing container 6. It is like that. Thereby, the processing container 6 receives a part of the strong alkaline electrolyzed water from the drain port 22 of the strong alkali container 4, and the chlorine gas collected by the vacuum pump 7 can be dissolved therein to store water. .

  The drainage container 8 is disposed so as to receive drainage from the other branch pipe 24 of the strong alkali container 4, the drainage port 26 of the strong acid container 5, and the drainage port 29 of the processing container 6.

Next, the operation will be described.
In the electrolyzed water treatment apparatus 1, first, water is stored in the water storage container 2, salt is added to make 10 mM saline, and electrolysis is performed by the electrolyzer 3 at a voltage of 12 V and a current of 0.8 A. Electrolysis is continued for about 15 minutes to produce strong acidic electrolyzed water having a pH of 2 to 4 in the anode chamber 12 and strong alkaline electrolyzed water having a pH of 10 to 12 in the cathode chamber 13.

  The on / off valve 15 of the cathode chamber 13 is opened, strong alkaline electrolyzed water is put into the strong alkali container 4 from the drain port 17, the on / off valve 14 of the anode chamber 12 is opened, and strong acid electrolyzed water is fed from the drain port 16 to the strong acid container 5. Put in. The on-off valve 21 of the strong alkali container 4 is opened to the branch pipe 23 side, and a part of the strong alkaline electrolyzed water is put into the processing container 6 from the drain port 22.

  Thereafter, an object to be processed such as an endoscope may be placed in the strong alkali container 4 and washed with strong alkaline electrolyzed water. By washing the object to be treated with strong alkaline electrolyzed water, it is easy to wash protein stains such as blood coagulated under acidic conditions. Moreover, you may put a to-be-processed object in the container 5 for strong acids, and may make it soak in strong acidic electrolyzed water. The object to be treated can be sterilized by washing with strongly acidic electrolyzed water. Thus, the electrolyzed water treatment apparatus 1 can be suitably used for cleaning an endoscope or the like.

  After cleaning and sterilization, the vacuum pump 7 collects chlorine gas generated from the strongly acidic electrolyzed water stored in the strong acid container 5 and discharges it to the processing container 6. Thereby, the chlorine gas generated from the strongly acidic electrolyzed water can be dissolved in a part of the strongly alkaline electrolyzed water inside the processing vessel 6 to obtain a chlorine-dissolved water, and the chlorine gas can be safely processed. In addition, there is no need for maintenance to replace the used adsorbent, and the cost and labor are not required. Furthermore, since the chlorine gas generated from the strongly acidic electrolyzed water is recovered from the sealed strong acid container 5 by the vacuum pump 7, it is possible to prevent the toxic chlorine gas from leaking and the safety is high.

  The strong alkaline electrolyzed water remaining in the strong alkali container 4 is put into the drainage container 8 through the drain port 22 by opening the on-off valve 21 to the branch pipe 24 side. Further, the strongly acidic electrolyzed water remaining in the strong acid container 5 is also put into the drainage container 8 from the drain outlet 26 by opening the on-off valve 25. Further, the chlorine-dissolved water inside the processing vessel 6 is also put into the drainage vessel 8 from the drainage port 29 by opening the on-off valve 28. Thereby, strong alkaline electrolyzed water, strongly acidic electrolyzed water, and chlorine-dissolved water can be mixed and neutralized inside the drainage vessel 8. For this reason, strong acidic electrolyzed water and strong alkaline electrolyzed water can be safely treated and discarded together with chlorine-dissolved water. Since the treated water can be discarded at a safe pH, the burden on the environment can be reduced without damaging the piping during disposal.

  Regarding the electrolyzed water treatment method and electrolyzed water treatment apparatus 1 according to the embodiment of the present invention, the treatment effect of chlorine gas generated from strongly acidic electrolyzed water was examined. First, in the electrolyzed water treatment apparatus 1, water is stored in the water storage container 2, salt is added to prepare 10 mM saline (sodium chloride aqueous solution; NaCl), and electrolysis is performed by the electrolysis apparatus 3 at a voltage of 12 V and a current of 0.8 A. Went. Electrolysis was continued for 15 minutes to generate strongly acidic electrolyzed water in the acidic anode chamber 12 and strong alkaline electrolyzed water in the alkaline cathode chamber 13.

  300 ml of strongly acidic electrolyzed water immediately after electrolysis is placed in a 500 ml suction side flask, 300 ml of strong alkaline electrolyzed water is placed in a 500 ml discharge side flask, and the gas in the suction side flask is sucked with a pump to cause strong alkali electrolysis of the discharge side flask. After discharging into water, the chlorine gas concentration in each flask and the physical properties of each electrolyzed water were measured. Measurement is performed immediately after electrolysis (before pump operation), 1 minute after pump operation, 90 minutes after chlorine operation (Cl GAS), effective chlorine concentration (Cl) in each aqueous electrolyte solution, dissolved oxygen concentration (DO), electricity Conductivity (EC), redox potential (ORP), and pH were measured.

  The results are shown in Table 1. As shown in Table 1, the pH of the generated strongly acidic electrolyzed water was 2.37 to 2.49, and the pH of the strongly alkaline electrolyzed water was 10.35 to 11.96. In addition, the chlorine gas concentration in the discharge flask on the strong alkaline electrolyzed water side was 0.05 ppm or less, which is the detection limit. From this result, it was confirmed that the chlorine gas generated in the strongly acidic water can be dissolved in strong alkaline electrolyzed water and safely treated as chlorine-dissolved water.

  For comparison, the same measurement was performed when 300 ml of ultra-pure MilliQ water was placed in the discharge side flask instead of strong alkaline electrolyzed water, and when the discharge side flask was emptied. The results are shown in Tables 2 and 3. As shown in Table 2, the chlorine gas concentration in the discharge flask on the MilliQ water side is 20 ppm after 1 minute from the pump operation, and considering the results in Table 1, the strongly alkaline electrolyzed water is better than the MilliQ water. It was confirmed that the ability to dissolve chlorine gas was excellent. In addition, as shown in Table 3, the chlorine gas concentration in the empty discharge flask is 30 ppm after 1 minute from the pump operation. Considering the results in Table 1, strong alkaline electrolyzed water effectively removes chlorine gas. It was confirmed that it was dissolved.

  Next, (4) 300 ml of treated water in which strong acidic electrolyzed water 90 minutes after completion of electrolysis and strong alkaline electrolyzed water 90 minutes after mixing at 50:50 was put into a 500 ml suction flask, and the suction flask immediately after The chlorine gas concentration (Cl GAS) was measured. Moreover, about the treated water, dissolved oxygen (DO), electrical conductivity (EC), oxidation-reduction potential (ORP), pH, and effective chlorine (Cl) in water were measured.

  The results are shown in Table 1. As shown in Table 1, the pH of the treated water was 6.66, the chlorine gas was 0.05 ppm or less, and it was confirmed that the treated water could be discarded at a safe pH and chlorine gas concentration. Thus, strong acidic electrolyzed water and strong alkaline electrolyzed water can be safely treated and discarded together with chlorine-dissolved water. Since the treated water can be discarded at a safe pH, the burden on the environment can be reduced without damaging the piping during disposal.

It is a schematic block diagram which shows the electrolyzed water treatment apparatus of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrolyzed water treatment apparatus 2 Water storage container 3 Electrolysis apparatus 4 Strong alkali container 5 Strong acid container 6 Treatment container 7 Vacuum pump 8 Drainage container 11 Electrolysis diaphragm 12 Anode chamber 13 Cathode chamber 14, 15, 21, 25 28 On-off valve 16, 17, 22, 26, 29 Drain port 18 Anode 19 Cathode 20 Power supply 23, 24 Branch pipe 27 Cover 30 Recovery pipe 31 Exhaust pipe

Claims (3)

An electrolytic water treatment method for treating strongly acidic electrolyzed water and strong alkaline electrolyzed water obtained by electrolyzing an aqueous chloride salt solution,
A first step in which chlorine gas generated from the strongly acidic electrolyzed water is dissolved in a part of the strongly alkaline electrolyzed water to form chlorine-dissolved water;
A second step of mixing and neutralizing the chlorine-dissolved water, the strongly acidic electrolyzed water, and the other part of the strongly alkaline electrolyzed water,
An electrolyzed water treatment method comprising: The electrolytic water treatment method according to claim 1 , wherein the strongly acidic electrolyzed water has a pH of 2 to 4, and the strongly alkaline electrolyzed water has a pH of 10 to 12. An electrolyzed water treatment device for treating strongly acidic electrolyzed water and strong alkaline electrolyzed water obtained by electrolyzing an aqueous chloride salt solution,
A strong alkali container for storing the strong alkaline electrolyzed water, provided with a drain port having an on-off valve;
A sealable strong acid container for storing the strongly acidic electrolyzed water provided with an exhaust port and a drain port having an on-off valve;
A drainage port having an on-off valve is provided, and a processing container for receiving and storing the strong alkaline electrolyzed water from the drainage port of the strong alkali container,
A pump for discharging chlorine gas discharged from the exhaust port of the strong acid container into the strong alkaline electrolyzed water in the processing container;
A drainage container for receiving drainage from the drain of the strong alkali container, the drain of the strong acid container and the drain of the processing container,
An electrolyzed water treatment apparatus comprising:

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