JP3509915B2 - Method and apparatus for removing carbon dioxide component dissolved in water, and electrolyzed water generator equipped with the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for removing carbon dioxide gas components dissolved in water, and an electrolyzed water producing apparatus equipped with the removal apparatus.

[0002]

2. Description of the Related Art A considerable amount of carbon dioxide gas component in water is C
It is dissolved in the state of O ₂ , H ₂ CO ₃ , HCO ₃ ⁻ , CO ₃ ^2−, etc., and it is necessary to remove these carbon dioxide gas components depending on the application. For example, if the carbon dioxide gas component described above is dissolved in the raw water used in the case of electrolyzing salt water to generate acidic water and alkaline water, the CO ₂ generation overvoltage is low, and therefore CO ₂ gas is not generated. Electricity is consumed, the pH of the acidic water is not lowered, and the production of available chlorine is reduced, which causes problems. The same can be said when ordinary water is electrolyzed to generate acidic water and alkaline water.

As a method for removing the carbon dioxide gas component dissolved in water, a method using a membrane deaerator is known. The membrane degassing device is described in the publication “JETI Vol.40,
NO. 4 (1992) ”, the water having carbon dioxide gas component dissolved therein is caused to flow along one side of the permeable membrane, and the internal and external differential pressures applied to the permeable membrane are applied. The carbon dioxide component dissolved in water is removed through the permeable membrane.

[0004]

By the way, when carbon dioxide gas components are removed using the gas permeable membrane, CO ₂ and H ₂ CO ₃ components in the dissolved carbon dioxide gas components are removed, but HCO ₃ ^It is difficult to remove the ^- and CO ₃ ^2- components, and it cannot be said to be a sufficient removal method depending on the purpose. In particular, in the step of obtaining acidic water and alkaline water by electrolysis of the above-mentioned normal water or salt water, the above-mentioned problems cannot be solved.
Therefore, an object of the present invention is to provide a removal method and a removal device capable of sufficiently removing carbon dioxide gas components dissolved in water,
There is a solution to the above problems.

[0005]

Means for Solving the Problems The present invention is a method for removing the carbon dioxide component removing apparatus, and relates to electrolytic water generator with the removal device, method for removing carbon dioxide component is a first aspect of the present invention , Removes carbon dioxide components dissolved in water
It is a method of removing carbon dioxide gas component to generate volatile water.
The raw water in which the carbon dioxide gas component is dissolved is supplied to the anode chamber and the cathode chamber formed by arranging the electrodes in the compartments partitioned by the diaphragm to be electrolyzed, and the produced water generated in the anode chamber is generated. the carbon dioxide component dissolved in the product water due to the pressure difference inside and outside granted to the <br/> permeable membrane by flowing along one side of the gas permeable film is removed by passing through the permeable membrane, the mosquito
It is characterized by being combined with the generated water generated in the sword chamber .

Further, a removing device according to a second aspect of the present invention is a device for carrying out the first aspect of the invention, in which an anode chamber and a cathode are formed by arranging electrodes in compartments partitioned by a diaphragm. An electrolytic cell having a chamber, the anode chamber and the chamber
Supply raw water with dissolved carbon dioxide to the sword chamber
A pair of raw water supply pipes, the anode chamber and the caustic
Each of the generated water generated in the
An electrolyzer comprising a pair of outflow conduits to be combined, and a membrane degasser that contains a gas permeable membrane and has a flow passage on one side of the permeable membrane to provide a differential pressure between the inside and outside of the permeable membrane. An apparatus is provided, and the flow passage of the membrane degassing device is connected to the outflow pipe of the anode chamber side generated water of the electrolytic cell .

Furthermore, the electrolyzed water producing apparatus which is the third invention of the present invention utilizes the removing apparatus which is the second invention.
A electrolytic water generation apparatus, have the anode and cathode chambers formed by placing the electrode compartment partitioned by a diaphragm
Carbon dioxide gas in the electrolytic chamber and in the anode chamber and cathode chamber.
A pair of raw water supplies that supply raw water in which
Generated in the feed line and the anode chamber and cathode chamber
A pair of discharged waters that combine with each other
An electrolysis apparatus comprising an outflow conduit, a membrane degassing apparatus having a gas permeable membrane built therein and having a flow passage on one side of the permeable membrane to impart a differential pressure to the inside and outside of the permeable membrane, Generated in the anode chamber and cathode chamber through each outflow line
The treated water storage tank to which each produced water is supplied and the treated water stored in the treated water storage tank are used as electrolyzed water.
Pipeline for supplying electrolyzed water to the anode chamber and cathode chamber
And the anode chamber and cathode
Discharge each generated water generated in the room independently
A pair of discharge line that, Ru der which the membrane degassing device is characterized in that it is disposed in the outlet line of the anode chamber side generated water. In the electrolyzed water producing apparatus, the treated water storage tank is provided with a salt applying means for applying salt to the salt water preparing apparatus, and the salt water prepared by the salt water preparing apparatus is used as electrolyzed water in the electrolytic tank. Of the anode chamber and
It is possible to supply each to the room .

[0008]

According to the method and apparatus for removing carbon dioxide gas components of the present invention, when water is supplied to the electrolyzer and a DC voltage is applied to both electrodes of the electrolyzer to cause electrolysis, the anode chamber side The generated water of the above becomes acidic and the generated water of the cathode chamber side becomes alkaline. Further, of the carbon dioxide component dissolved in the water at the cathode chamber HCO ₃ ^-
Since the CO ₃ ²⁻ component and the CO ₃ ²⁻ component permeate the diaphragm and move into the anode chamber, the carbon dioxide gas component does not exist in the cathode chamber. On the other hand, in the anode chamber side, the generated water is acidic and p
Since H is low, HCO ₃ ⁻ and CO ₃ ²⁻ components are CO ₂ and H
_The CO ₂ and H ₂ CO ₃ components in the carbon dioxide gas component are dissolved in the produced water in the anode chamber after being converted into ₂ CO ₃ components, and a part of CO _{2 in} these components is removed as a gas. .

The produced water on the anode chamber side is then supplied to the membrane degassing device and flows along one side of the gas permeable membrane, so that gas separation in the produced water occurs due to the action of the differential pressure between the inside and outside of the permeable membrane. , CO ₂ and H ₂ CO ₃ components permeate the permeable membrane and are separated and removed. Therefore , the produced water on the anode chamber side that has flowed out from the membrane degasser is in a state in which the carbon dioxide gas component is almost completely removed, and the produced water on the anode chamber side is produced on the cathode side.
When combined with water, it becomes neutral water from which carbon dioxide gas components have been removed .

Further, in the electrolyzed water producing apparatus of the present invention, first, raw water is supplied to the electrolyzing apparatus to be electrolyzed, and the produced water in the anode chamber side is supplied to the membrane degassing apparatus to dissolve dissolved carbon dioxide gas components. By separating and removing, it is possible to supply the treated water storage tank with water in which the carbon dioxide gas component is not dissolved from the anode chamber side and the cathode chamber side, and the decarbonated water necessary for electrolysis is secured by this water, or It is possible to prepare salt water having a predetermined concentration required for decomposition. For this reason,
When the required amount of decarbonated water or salt water is prepared, the feed water to the electrolyzer can be switched from raw water to the treated water storage tank for electrolysis of decarbonated water or salt water. Therefore, the electrolyzed water generator can generate water in which the carbon dioxide gas component is not dissolved, and the same water is used as raw water to prepare decarbonated water or salt water having a required concentration, which is electrolyzed to the anode chamber side. Along with being able to generate acidic water,
It is possible to generate alkaline water on the cathode chamber side.

[0011]

EXAMPLE An example of the present invention will be described below. FIG. 1 shows a carbon dioxide gas component removing device according to the present invention.
The removal device is composed of an electrolysis device 10 and a membrane degassing device 20, and the electrolysis device 10 is arranged in an electrolytic cell 11 and a diaphragm 12 for partitioning the inside into two compartments, and a partition 12 for each compartment. A positive electrode plate 13 and a negative electrode plate 14 provided,
The anode plate 13 is disposed in one of the compartments and the anode chamber Ra is
And the cathode plate 14 is disposed in the other compartment to form the cathode chamber Rb. Electrolyzer 1
1, the first and second supply pipelines 11a and 11b, which are raw water supply pipelines connected to the raw water supply source, and the first and second outflow pipelines 11c and 11d connected to the reservoir are connected. There is. The first supply pipeline 11a and the first outflow pipeline 11c are connected to the anode chamber Ra, and the second supply pipeline 11b and the second outflow pipeline 11d are connected to the cathode chamber Rb.
In the electrolysis device 10, a DC voltage is applied to each of the electrode plates 13 and 14. The membrane degassing device 20 is arranged in the first outflow conduit 11c of the electrolysis device 10.

The membrane deaerator 20 has a module 21 in which hollow fibers of synthetic fibers are bundled in a housing 21, and the module 22 constitutes a gas permeable membrane.
In the membrane deaerator 20, the generated water on the anode chamber Ra side flows in each hollow fiber forming the module 22,
On the other hand, a negative pressure is applied through the conduit 23 provided in the housing 21 so that the outside of the hollow fiber is evacuated.

In the removal device, raw water is supplied to the anode chamber Ra and the cathode chamber Rb of the electrolysis device 10 and a direct current voltage is applied to both electrodes 13 and 14 of the electrolysis device 10 for electrolysis and membrane degassing. A negative pressure is applied to the device 20 to bring the outside of each hollow fiber of the module 22 into a vacuum state, and the generated water in the anode chamber Ra is circulated inside each hollow fiber. In this case, in the electrolysis device 10, the produced water on the anode chamber Ra side becomes acidic and the cathode chamber Rb
The generated water on the side becomes alkaline. Also, the cathode chamber Rb
Of the carbon dioxide gas dissolved in water, HCO
_{Since the 3} ⁻ and CO ₃ ²⁻ components pass through the diaphragm 12 and move into the anode chamber Ra, the carbon dioxide gas component does not exist in the cathode chamber Rb. On the other hand, since the water produced in the anode chamber Ra side is acidic and has a low pH, the HCO ₃ ⁻ and CO ₃ ²⁻ components are converted into CO ₂ and H ₂ CO ₃ components and the anode chamber Ra
The produced water therein is in a state in which only CO ₂ and H ₂ CO ₃ components in the carbon dioxide gas component are dissolved, and a part of CO ₂ of these components is removed as a gas.

The produced water on the side of the anode chamber Ra is separated into gas in the produced water by the action of the pressure difference between the inside and the outside of the hollow fibers while flowing through each hollow fiber in the membrane deaerator 20.
The O ₂ and H ₂ CO ₃ components permeate each hollow fiber and are separated and removed. Therefore, the produced water on the cathode chamber Rb side and the produced water on the anode chamber Ra side that has flowed out from the membrane degassing device 20 are in a state in which the carbon dioxide gas component has been almost completely removed, and then coalesce and flow out.

FIG. 2 shows an electrolyzed water producing apparatus which is a second embodiment of the present invention. The generator is the electrolyzer 10.
And a membrane degassing device 20 and a salt water preparation device 30. The electrolysis device 10 and the membrane degassing device 20 have the same structure as the electrolysis device and the membrane degassing device in the carbon dioxide gas component removing device of the first embodiment shown in FIG. Further, the salt water preparation device 30 includes a storage tank 31 and a concentrated saline solution tank 32, and a fixed amount of concentrated saline solution is added from the concentrated saline solution tank 32 into the storage tank 31 that stores a fixed amount of water to obtain a dilute solution having a predetermined concentration. Saline is prepared.

In the electrolysis apparatus 10, however, the electrolytic cell 11 is connected to the raw water supply source by the first supply pipeline 41a which is a raw water supply pipeline , and the electrolyzed water supply pipeline is provided.
It is connected to the storage tank 31 of the salt water preparation device 30 by the second supply pipe line 42a which is a line, and the first outflow pipe line 43a
It is connected to the storage tank 31 by an outflow conduit 44a. Further, the first and second discharge pipelines 45a and 46a are connected to the outflow pipelines 43a and 44a. Each of these pipelines 41a
Opening / closing valves 41b to 46b are respectively provided in the through holes 46a to 46a, and the membrane degassing device 20 is provided downstream of the valve 43b in the first outflow conduit 43a.

In the electrolyzed water producing apparatus having the above construction,
Raw water is supplied to the electrolytic cell 11 with the valves 41b, 43b, 44b in the open state and the valves 42b, 45b, 46b in the closed state, and the raw water is supplied to the electrolytic cell 11 in the same manner as in the removing apparatus of the first embodiment. As a result of the decomposition, the water produced on the side of the anode chamber Ra becomes CO ₂ and H ₂ C in the carbon dioxide gas component.
Only the O ₃ component is dissolved, and the membrane degassing device 20
In addition, the produced water on the cathode chamber Rb side has no carbon dioxide gas dissolved therein and is supplied to the storage tank 31 of the salt water preparation device 30. The produced water on the side of the anode chamber Ra is supplied to the storage tank 31 after the CO ₂ and H ₂ CO ₃ components are removed by the membrane deaerator 20. Therefore, the water in the storage tank 31 is water in which carbon dioxide gas components are not dissolved, and is suitable as raw water for preparing saline solution to be subjected to electrolysis.

In the electrolyzed water producing apparatus, the storage tank 3
When the water in 1 reaches a predetermined amount, the supply of raw water is stopped and the water in the electrolytic cell 11 is discharged. On the other hand, in the salt water preparation device 30, a concentrated salt water tank 32 is provided inside the storage tank 31.
A fixed amount of concentrated saline solution is added to prepare a dilute saline solution having a predetermined concentration. When diluted saline is prepared, each valve 4
1b, 43b, 44b are closed and each valve 42
b, 45b, 46b are open, and dilute saline is used in the electrolytic cell 11
And is electrolyzed in the electrolytic cell 11 to generate acidic water in the anode chamber Ra and alkaline water in the cathode chamber Rb.
Each of these electrolyzed water is discharged to a predetermined place through each of the discharge pipe lines 45a and 46a.

As described above, in the electrolyzed water producing apparatus, the raw water is first supplied to the electrolyzing apparatus 10 for electrolysis, and the produced water on the anode chamber Ra side is supplied to the membrane degassing apparatus 20 to be dissolved. By separating and removing the carbon dioxide gas component, a required amount of water in which the carbon dioxide gas component is not dissolved can be supplied to the storage tank 31 of the salt water preparation device 30 from the anode chamber Ra side and the cathode chamber Rb side, and the electrolysis is performed by the water. It is possible to prepare a saline solution having a required concentration. Further, when a required amount of saline solution is prepared, the supply water to the electrolysis device 10 can be switched from raw water to saline solution to perform electrolysis of saline solution. Therefore, with the electrolyzed water generator, it is possible to generate water in which the carbon dioxide component is not dissolved,
Using the same water as raw water, a saline solution having a required concentration can be prepared and efficiently electrolyzed to generate acidic water on the anode chamber Ra side and alkaline water on the cathode chamber Rb side.

In the electrolyzed water producing apparatus, only the storage tank 31 of the salt water preparing apparatus 30 is used, or the concentrated saline solution tank 32 is abolished and the carbon dioxide gas component is removed from the storage tank 31. Can be supplied to the electrolyzer 10 and modified to electrolyze decarbonated water.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a carbon dioxide gas removing device according to the present invention.

FIG. 2 is a schematic configuration diagram of an electrolyzed water generator according to the present invention.

[Explanation of symbols]

10 ... Electrolysis device, 11c ... Outflow pipe line, 20 ... Membrane degassing device, 30 ... Salt water preparation device, 41a, 42a ... Supply pipe line,
43a, 44a ... Outflow line, 45a, 46a ... Discharge line, Ra ... Anode chamber, Rb ... Cathode chamber.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-296966 (JP, A) JP-A-4-108353 (JP, A) JP-A-2-52088 (JP, A) JP-A-5- 138171 (JP, A) JP-A-5-220480 (JP, A) JP-A-5-123676 (JP, A) Actual Kaihei 5-26194 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) C02F 1/46 B01D 19/00 C02F 1/20

Claims (4)

(57) [Claims] 1. Neutral by removing carbon dioxide gas components dissolved in water
A method of removing carbon dioxide gas components to generate water, in which raw water in which carbon dioxide gas components are dissolved is supplied to an anode chamber and a cathode chamber formed by arranging electrodes in compartments partitioned by a diaphragm to generate electricity. decomposition, the water generated by the anode chamber, wherein the permeable membrane carbon dioxide gas components dissolved in the product water by internal and external differential pressure was applied to the permeable membrane by flowing along one side of the gas permeable membrane Permeate and remove the cathode
A method for removing carbon dioxide gas components dissolved in water, characterized in that it is combined with generated water generated in a chamber . 2. Neutral by removing carbon dioxide gas components dissolved in water
A device for removing carbon dioxide gas components for producing water, an electrolytic cell having an anode chamber and a cathode chamber formed by arranging electrodes in compartments partitioned by a diaphragm, and the anode
The raw water containing dissolved carbon dioxide in the chamber and cathode chamber
A pair of raw water supply pipes for supplying the raw water and the anode chamber and
And the generated water generated in the cathode chamber
And a membrane having a gas permeable membrane and having a flow passage on one side of the permeable membrane to provide a differential pressure between the inside and outside of the permeable membrane. A device for removing a carbon dioxide gas component dissolved in water, comprising a deaerator, wherein the flow passage of the membrane deaerator is connected to an outflow pipe of the produced water on the anode chamber side of the electrolytic cell . 3. Water which does not dissolve carbon dioxide gas is used as electrolyzed water.
An electrolytic water generation apparatus for the anode and cathode chambers formed by placing the electrode compartment partitioned by a diaphragm
Carbon dioxide in the electrolytic cell and the anode chamber and cathode chamber
A pair of raw water that supplies raw water in which gas components are dissolved
Generated in the supply line and the anode chamber and cathode chamber
A pair that let each produced water flow out and combine with each other
An electrolysis apparatus comprising an outflow pipe line, and a membrane degassing apparatus having a gas permeable membrane and having a flow passage on one side of the permeable membrane to impart a differential pressure to the inside and outside of the permeable membrane, Generated in the anode chamber and the cathode chamber through each of the outflow pipes.
The treated water storage tank to which each generated water is supplied and the treated water stored in the treated water storage tank are treated as electrolyzed water.
Electrolyzed water supply pipe for supplying to the anode chamber and cathode chamber
Channel, connected to each of the outflow lines and the anode chamber and
Discharge each generated water generated in the sword chamber independently
A pair of discharge line for electrolyte to the membrane degasifier is provided with a device for removing carbon dioxide component dissolved in the water, characterized in that disposed on the outlet line of the anode chamber side generated water Water generator. 4. The electrolyzed water producing apparatus according to claim 3, wherein the treated water storage tank is provided with a salt applying means for applying salt to constitute a salt water preparation apparatus, and the salt water preparation apparatus is prepared. Using the salt water as electrolyzed water, the anode chamber of the electrolytic cell
And a cathode chamber, respectively .