KR20160038290A - Flow-electrode device with electrode regeneration by short circuit and capacitive deionization device - Google Patents

Abstract

The present invention relates to a method of regenerating ion adsorption capacity by short circuit of a flow cathode and a flow anode, and a desalination device applying the same. The desalination device can continuously perform desalination process while consuming little amount of electrode by simultaneously regenerating flow electrodes with desalination process. According to the present invention, the area and costs required for installing a desalination device can be remarkably reduced by integrating a supply line and a recovery line of the flow cathode and flow anode. Therefore, the desalination device of the present invention can reduce costs required to regenerate electrodes and can reduce the amount of flow electrodes consumed for desalination process.

Description

TECHNICAL FIELD [0001] The present invention relates to a flow electrode device capable of regenerating an electrode by an electrical short circuit, and a capacitive de-ionization device using the flow electrode device.

The present invention relates to a flow electrode device capable of regenerating an electrode by an electrical short circuit and a capacitive desalination device using the flow electrode device. More particularly, the present invention relates to a flow electrode device capable of regenerating an electrode by electrical shorting, And a continuous operation method of a storage and desalination apparatus for desalinating salt water using the same.

Recently, researches on flow electrodes under the name of electrochemical flow capacitors (EFC) have been attracting attention for the purpose of mass storage of energy in the field of energy storage.

In the field of water treatment such as water treatment or wastewater treatment and seawater desalination, an electrochemical process capable of water treatment at a very low energy cost compared to the conventional evaporation method or reverse osmosis (RO) method, namely, a capacitive deionization (CDI) Recently, a flow electrode capacitive deionization (FCDI) process using a flow electrode, a new technology that facilitates continuous process and large capacity, is under development.

The EFC is a concept in which ions move and store between the flow electrodes disposed on both sides of the separator by an external power source and stores energy through the electrode. The ions of the saline water between the separators are moved to both flow electrodes by an external power source It has a similar concept to FCDI which is desalted.

In particular, since FCDI can store energy by storing adsorbed ions in a separate container, it is evaluated as a technology applicable not only to desalination but also to an energy storage field.

In view of the above characteristics, the present inventors have filed for a flow electrode device (Korean Patent No. 10-1233295), and have developed it (Korean Patent No. 10-1318331), Energy Storage (Korean Patent No. 10-1210525) (Korean Patent No. 10-1221562).

In the desalination method using the flow electrode device, it is necessary to discharge the flow electrode in which ions are saturated, and the amount of the flow electrode is increased in order to increase the salt water treatment capacity.

Korean Patent No. 10-1233295 Korean Patent No. 10-1318331 Korean Patent No. 10-1210525 Korean Patent No. 10-1221562

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrode recycling method using an electrical short circuit by integrating a flow anode and a flow cathode, and an efficient and economical desalination process using the same.

In addition, by integrating the flow anode and the flow cathode, it is possible to simply reduce the electrode usage through continuous regeneration of both flow electrodes by combining the storage vessels, and drastically reduce the electrode manufacturing cost and the space occupied by the flow electrode system.

According to an aspect of the present invention, there is provided an electrolytic cell including: a flow cathode flow channel and a flow cathode flow channel through which a flow electrode having a flowing electrode active material flows; and an electrolyte flow channel through which an electrolyte flowing between the flow anode flow channel and the flow cathode flow channel flows A negative electrode is movable between the electrolyte and the flow anode, positive ions are movable between the electrolyte and the flow cathode, and a flow electrode through the flow anode channel and a flow electrode through the flow cathode passage, And then flows into the flow channel and the flow cathode flow channel again.

That is, when the flow electrode is supplied to the flow electrode device, the flow anode and the flow cathode, which are supplied to the flow cathode flow path and the flow cathode flow path through one storage vessel and which have passed through the flow cathode flow path and the flow cathode flow path, It is a major feature of the present invention that it is sent to the flow electrode storage vessel to operate in a closed loop flow.

In the present invention, the flow electrode is defined as the sum of the flow anode and the flow cathode. The flow electrode is a mixture of an electrode active material and a fluid. It is possible to use a water-soluble electrolyte or an organic electrolyte as the fluid used for the flow electrode. Particularly, it is possible to use fresh water or brine as the fluid. Also, the flow electrode through which the positive ions are adsorbed by passing through the flow cathode flow path is a flow cathode, and the flow electrode through which the anion is adsorbed through the flow anode flow path is a flow anode.

Still another invention is a method of manufacturing a semiconductor device comprising: at least one flow electrode device; A flow electrode supply unit for supplying a flow electrode to the flow cathode flow path and the flow cathode flow channel again by flowing together the flow electrode passing through the flow anode flow path and the flow anode passing through the flow cathode flow path; An electrolyte supply unit for supplying an electrolyte to the flow electrode device; And a power supply for supplying power to the flow electrode device. In addition, an electrode regeneration control unit further measures and collects the salt concentration of the flow electrode; A fluid-liquid separator for separating and discharging the concentrated fluid from the separated flow electrodes; And a flow electrode regeneration unit for regenerating the flow electrode regenerated by the flow electrode supply unit or the flow electrode device by adding a fluid having a relatively low concentration to the flow electrode from which the fluid is separated.

The flow anode having adsorbed anions and the flow cathodes adsorbing cations are combined in the flow electrode storage vessel by the desalination process in the above-mentioned storage type desalination apparatus, so that electrical short-circuiting occurs due to contact of the electrode active materials, and adsorbed cations and anions And can be concentrated in the flowing liquid of the flow electrode. As a result, the adsorption capacity of the flow electrode is easily recovered and supplied again to the flow electrode device, thereby enabling continuous desalination operation. However, if the concentration of the fluid is excessively high, the desalination performance may deteriorate. Therefore, it is possible to regenerate the flow electrode simply by separating the concentrated fluid from the flow electrode and replacing it with a new fluid.

Replacing the flowing liquid of the flow electrode may be performed in such a manner that the salt concentration is equal to or higher than a predetermined concentration or a part or all of the flow electrode is flowed to a flow electrode having a relatively lower concentration than the flow electrode flowing in the flow electrode device at predetermined time intervals Can be replaced.

Another invention is the above-described capacitative desalination apparatus; A flow cathode flow passage through which the flow cathode supplied from the flow anodic channel of the storage and desorption device flows, a flow cathode flow passage through which the flow cathode supplied from the flow cathodic flow passage of the storage and desorption device flows, A recovering side flow electrode device disposed at a rear end of the accumulation type desalination device so that an electrolyte flowing between the flow paths has an electrolyte flow path; And a power device connected to the flow anode flow path and the flow cathode flow path of the collection side flow electrode device, wherein the flow anode and the flow cathode having passed through the collection side flow electrode device are connected to the storage desalination device To the flow-electrode-supply unit.

The power device refers to any device that can utilize the electric energy generated in the return side flow electrode device. That is, the power device may be a power storage device such as a capacitor or a battery, a device using electricity such as an electric fan or a lamp, or may be an electric conversion device such as an inverter.

Wherein a flow anode control unit is disposed between the flow anodic flow path of the storage and desorption apparatus and the flow anodic flow path of the recovering side flow electrode apparatus, and between the flow cathodic flow path of the storage desalination apparatus and the flow cathode flow path of the collection- Wherein the flow anode control unit and the flow cathode control unit are connected to the flow electrode supply unit and the flow anode control unit controls the flow anode supplied from the flow anodic channel of the storage desalination unit to the recovery side And the flow cathode control unit controls the amount of the flow cathode supplied from the flow cathode flow path of the storage and desorption apparatus to the flow of the flow- And the amount of each supplied to the cathode flow path and the flow electrode supply portion is controlled.

In addition, a flow anode storage portion is disposed between the flow anodic flow path of the storage and desorption device and the flow anodic flow path of the collection-side flow electrode device, and the flow cathode flow path of the storage- And a flow cathode storage portion is disposed between the flow paths.

It is possible to easily regenerate the flow electrode consumed in operations such as water purification, wastewater treatment, desalination and the like by the electrochemical desalination using the flow electrode, the amount of the flow electrode consumed for the same time can be drastically reduced, And the supply and storage of the flow cathode can be integrated to greatly reduce the installation space.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a charge and discharge apparatus using a flow electrode device according to Embodiment 1 of the present invention; FIG.
FIG. 2 is a graph showing desalination rate change with time at each step when a desalting experiment is performed at 0.3 V in Example 1 of the present invention. FIG.
FIG. 3 is a graph showing current changes with time in each step when the desalination experiment is performed at 0.3 V in the first embodiment of the present invention. FIG.
FIG. 4 is a graph showing the desalting rate change with time at each step when a desalting experiment is performed at 0.3 V in the conventional method for the comparative example of the present invention.
FIG. 5 is a graph showing a current change with time in each step when a desalination experiment is performed at 0.3 V in a conventional method for a comparative example of the present invention.
6 is a schematic view of a large-capacity energy storage device using a flow electrode according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components, and the same reference numerals will be used to designate the same or similar components. Detailed descriptions of known functions and configurations are omitted.

First, a flow electrode device 105 commonly used in all embodiments of the present invention will be described.

 1, the space defined between the anode current collector 111 and the cathode current collector 120 is partitioned by the anode separator 115 and the cathode separator 117, do. That is, the flow electrode device 105 includes a flow cathode passage 114 between the cathode separator 115 and the anode collector 111, a flow between the cathode collector 120 and the anode separator 117, An anode flow path 119 and an electrolyte flow path 116 between the cathode separation membrane 115 and the anode separation membrane 117.

A flow cathode 112 flows in the flow cathode flow passage 114 and a flow anode flows in the flow anode flow passage 119. The flow cathode 112 is a state in which a flow electrode in the form of a dispersed slurry in which an electrode active material is mixed with a fluid flows through a flow cathode passage 114 and a cation is adsorbed, And passes through the anode flow path 119 to adsorb anions. Examples of the electrode active material used for the flow cathode 112 and the flow anode 118 include porous carbon (activated carbon, carbon fiber, carbon aerogels, carbon nanotubes, etc.), graphite powder, metal oxide powder and the like.

The fluid may be a solution of a water-soluble electrolyte such as NaCl, H ₂ SO ₄ , HCl, NaOH, KOH and Na ₂ NO ₃ and a solvent such as propylene carbonate (PC), diethyl carbonate (DEC) And an organic electrolytic solution such as tetrahydrofuran (THF). Particularly, it is possible to use brine containing a large amount of salt (particularly, NaCl) or fresh water containing a small amount of salt as the fluid.

The cathode separation membrane 115 can use a dense membrane that selectively prevents the passage of electrolyte liquid between the flow cathode and the electrolyte channel, selectively passes only ions, and a cation selective membrane that selectively passes only cations.

It is also possible to use a dense membrane that selectively prevents passage of the electrolyte liquid between the flow cathode and the electrolyte channel, selectively passes only the ions, and an anion separation membrane that selectively passes only negative ions.

The electrolyte flows into the electrolyte flow path 116. The electrolyte includes a water soluble electrolyte solution such as NaCl, H ₂ SO ₄ , HCl, NaOH, KOH and Na ₂ NO ₃ and a solution of propylene carbonate Carbonate, PC), Diethyl Carbonate (DEC), and Tetrahydrofuran (THF). Particularly, it is possible to use brine containing a large amount of salt (particularly, NaCl) or fresh water containing a small amount of salt as the fluid. The electrolyte flow path 116 may be formed with a spacer which can form a flow path.

The flow direction of the electrolyte in the electrolyte flow path 116 and the flow direction of the fluid in the flow path 114 and the flow path 119 may be the same or opposite to each other.

The electrode current collectors 111 and 120 and the ion-removing membranes 115 and 117 may be any of those used in conventional fluidized bed electrode systems (batteries, batteries, etc.) And can be appropriately selected depending on the purpose and condition of use.

When the ions are adsorbed to the electrode active material flowing into the flow electrode device 105, the amount of ions that the flow electrode can adsorb is reduced. Therefore, when the flow cathode electrode 114 and the flow anode electrode of the flow anode flow path 119 passing through the flow electrode device 105 are electrically neutralized, the adsorbed ions escape to the fluid and the adsorption capacity of the flow electrode And by supplying it to the flow electrode device 105, the existing ion adsorption capacity of the electrode can be maintained without using a new flow electrode. However, since the concentration of the fluid is increased, only the fluid can be separated or replaced or replaced with a new flow electrode at a certain level of concentration.

Next, a description will be given of a capacitive desalination apparatus 100 using the flow electrode device 105. FIG.

In Fig. 1, reference numeral 100 designates a condensate desalination apparatus according to Embodiment 1 of the present invention.

The condensate desalination apparatus 100 mainly comprises a flow electrode device 105, a flow electrode supply part 140 for supplying and storing a flow electrode to the flow electrode device 105, A flow electrode recovery unit 142 for supplying a regeneration flow electrode to the flow electrode device 105, and a flow electrode recovery unit 142 for supplying a regeneration flow electrode to the flow electrode device 105, And an electrolyte supply portion 144 for supplying an electrolyte to the electrolyte.

In the electrolyte supply part 144, an electrolyte (for example, brine) having positive and negative ions is supplied to the electrolyte flow path 116 of the flow electrode device 105. The electrolyte having passed through the electrolyte flow path 116 has low or high ion concentration, so that fresh water can be obtained or utilized for other purposes.

The flow electrode supply unit 140 supplies a flow electrode in a slurry state including the electrode active material to the flow cathode flow path 114 and the flow cathode flow path 119.

A power supply device 130 for supplying current is connected to the flow electrode device 105 so that a potential difference is generated between the anode current collector 111 of the current flow electrode device 105 and the anode current collector 120 .

Therefore, when the electrolyte and the flow electrode are supplied to the flow electrode device 105, the positive ions are supplied to the cathode current collector 111 and the anode current collector 120 via the cathode separator 115, And the negative ions are adsorbed to the electrode active material via the positive electrode separator 117. As a result, the ions contained in the electrolyte are removed and the electrolyte is desalted.

The flow cathode (112) which adsorbs cations through the desalination process to fill the adsorption capacity by adsorbing anions with the flow cathode (112) is passed through the flow electrode device (105) (140).

Therefore, in the flow electrode supply unit 140, electrical short-circuiting occurs between the differently charged electrode active materials due to the physical contact between the flow cathode 112 and the flow anode 118. As a result, And anions are discharged as a flow electrode fluid, so that the adsorption capacity of the flow electrode is regenerated.

Therefore, the flow electrode re-supplied to the flow electrode device 105 can maintain the existing desalination performance.

If the desalination process is continued, the ion concentration in the flow electrode electrolyte becomes excessively high and the desalination performance may decrease. To prevent this, the flow electrode concentration of the flow electrode recovered to the flow electrode supply unit 140 exceeds the limit concentration A predetermined amount of flow electrodes may be sent from the flow electrode supply unit 140 to the fluid-liquid separating unit 141 to separate and discharge the enriched fluid.

In addition, the flow electrode from which the concentrated electrolyte is removed can be regenerated in accordance with the conventional composition through the addition of a new fluid in the flow electrode regeneration unit 142, and can be recycled to the flow electrode device 105.

Therefore, the storage and desalination apparatus 100 can perform a continuous desalination process while minimizing the amount of consumed flow electrodes.

FIG. 6 shows a mass storage device 101 according to the second embodiment of the present invention. It is possible to add the energy recovery device to the storage and desalination apparatus 100 in Embodiment 1 to recover the stored energy at a desired time.

The recovering side flow electrode device 106 used for recovering energy in Embodiment 2 is the same as the flow electrode device 105 of Embodiment 1 except that the flowing flow anode and the flow cathode are separated from the flow electrode device 105 There is a difference that the supply is directly introduced without a short.

To this end, the mass energy storage device 101 includes the storage depolarizer 100 as it is, and further receives and stores the flow anode 118 in which the ions are adsorbed from the storage and desalination device 100 A flow anode storage unit 151 for supplying the energy to the flow electrode device 106 for recovering the energy and a flow cathode 112 for storing ions from the storage desalination device 100, A flow cathode storage 152 for supplying the electrolyte to the device 106 and an electrolyte supply 145 for energy recovery to supply the electrolyte to the flow electrode device 106.

The flow cathode storage unit 151 and the flow cathode storage unit 152 can store a desired amount of the flow anode 118 and the flow cathode 112. The flow anode control unit 153 and the flow cathode control unit 154 It is possible to continuously operate the storage and desalination apparatus 100 by circulating the flow anode 118 and the flow cathode 112, which are no longer required to be stored, to the flow electrode supply unit 140.

A power device 131 is connected to the energy recovery device 106 and is supplied to the outside from the energy recovery device 106 which is currently supplied with electric energy generated by the discharge of ions stored in the flow electrode.

The power device 131 refers to any device that can utilize the electric energy generated in the recovery-side flow electrode device. That is, the power device 131 may be a power storage device such as a capacitor or a battery, or may be a device using electricity such as an electric fan or a lamp, or may be an electric conversion device such as an inverter.

In addition, the flow anode and the flow cathode, from which the ions that have escaped from the energy recovery device 106 have not been completely discharged, are supplied to the flow electrode supply portion, and ions are completely discharged into the flow electrode fluid by the electric short circuit. It is possible to reapply it to the flow electrode device 105.

Hereinafter, the present invention will be described in more detail with reference to experimental examples. However, the following experimental examples are intended to further illustrate the present invention and should not be construed to limit the scope of the present invention.

[Experimental Example 1]

A cation exchange membrane (Neosepta CMX, Tokuyama, Japan) and an anion exchange membrane (anion exchange membrane) were sandwiched between a rectangular positive electrode and a negative electrode current collector having a fine channel structure (Graphite, 294 x 210 mm, effective area of 228 cm 2) Neosepta AMX, Tokuyama, Japan) and a spacer (Polyester, 0.4 mm).

Activated carbon (average pore diameter 21 Å, total pore volume 1.71 cc / g) having a specific surface area of about 3,263 m 2 / g was finely pulverized with a nanodisperser (ISA-N-10, Ilshin Autoclave, Korea) A flow electrode having an average particle size of 8 mu m of activated carbon in distilled water was produced. The prepared 0.5 L flow electrode was placed in one storage container and passed through the positive and negative electrode flow paths of the flow electrode device at a flow rate of 25 ml / min, and the flow electrode passed through the flow electrode device again returned to the original storage container And supplied in a closed cycle flow.

At the same time, the NaCl electrolyte solution was passed through the electrolyte passage of the flow electrode device at a flow rate of 3 ml / min using a micro-metering pump (Minichemi pump, Japan Fine Chemicals Co., Ltd.), and the desalted NaCl electrolyte solution Collected and passed through the flow electrode device again to measure the change in electrical conductivity.

In each step, the external terminal of the flow electrode device was connected to a Potentiostat (Ivium Technologies BV, Netherlands), and a desalination experiment was performed by applying a voltage of 0.3V.

The concentration of the NaCl electrolyte solution after passing through the flow electrode device was measured every 10 seconds by a conductivity meter (S47, Mettler-Toledo, Switzerland) and the concentration change with desalting time is shown in FIG. 2, Respectively. Table 1 also shows the overall results. Also, the desalination experiment in the open cycle flow of the flow electrode, which is a method taken in the existing process, is performed under the above-described conditions, and the concentration change is shown in FIG. 4 and the current change is shown in FIG.

Experimental stage Example Comparative Example Number of inputs
density
(mS / cm) Production
density
(mS / cm) Desalination rate
(%) Measuring current
(mA) Number of inputs
density
(mS / cm) Production
density
(mS / cm) Desalination rate
(%) Measuring current
(mA) Stage 1 55.3 47.2 14.65 425 54.2 46.6 14.02 420 Step 2 47.4 39.2 17.3 450 46.6 42.7 8.37 190 Step 3 39.2 31.2 20.41 440 42.7 40.5 5.15 85 Step 4 31.1 23.4 24.76 415 40.7 39.0 4.18 55

Experimental results show that the flow electrode which adsorbs ions in the conventional flow electrode operating method is put into the desalting process and the desalting performance is lowered at each step. This means that the ion adsorption capacity of the flow electrode has been reduced by ion adsorption in the previous step, which means that it can not be reused without the regeneration process of the flow electrode used in the desalting process.

 On the other hand, it can be seen that the desulfurization performance is maintained even when the flow electrode is re-supplied in the closed cycle flow where the ion-adsorbed flow electrodes are mixed with each other in one storage vessel. This is because the flow electrode discharges ions adsorbed by the electric short between the electrode active materials in the flow electrode supply portion into the fluid.

3 and FIG. 5 showing the current changes of the embodiment and the comparative example, in the conventional flow electrode operating system, the amount of ions flowing into the flow electrode is significantly reduced as the step progresses. In contrast, in the present invention, Is constant.

Therefore, it can be seen from the present invention that the adsorption capacity of the electrode active material can be simply regenerated by reusing the electrode active material by mixing the flow cathode and the flow anode without any regeneration process, and can be used for the continuous desalination process. In addition, unlike the conventional flow electrode operating method in which the amount of flow electrode consumed increases with time, since the flow electrode flows in a closed loop until the concentration of the flowing liquid reaches the limit, the flow consumed in the desalting process It can be seen that the amount of the electrode can be greatly reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It can be understood that

100: a storage type desalination device 101: an energy storage and recovery device
105: flow electrode device 106: return-side flow electrode device
111: cathode current collector 112: flow cathode
114: flow cathode flow path 115: cathode separator
116: electrolyte flow path 117: anode separator
118: flow anode 119: flow anode channel
120: positive electrode current collector 130: power supply unit
131: Power device 140: Flow electrode supply part
141: Fluid liquid separator 142: Flow electrode regenerator
144, 145: electrolyte supply part 151: flow anode storage part
152: flow cathode storage unit 153: flow anode control unit
154: flow cathode control unit

Claims (8)

A flow cathode flow path and a flow cathode flow path through which a flow electrode having a flowing electrode active material flows and an electrolyte flow path through which an electrolyte flowing between the flow anode flow path and the flow cathode flow path moves,
An anion can move between the electrolyte and the flow anode, and a cation can move between the electrolyte and the flow cathode,
Wherein the flow electrode passing through the flow cathode flow path and the flow electrode passing through the flow cathode flow path are joined together and then introduced into the flow cathode flow path and the flow cathode flow path.
At least one flow electrode device of claim 1;
A flow electrode supply unit for supplying a flow electrode to the flow cathode flow path and the flow cathode flow channel again by flowing together the flow electrode passing through the flow anode flow path and the flow anode passing through the flow cathode flow path;
An electrolyte supply unit for supplying an electrolyte to the flow electrode device; And
And a power supply for supplying electric power to the flow electrode device.
The method according to claim 2, wherein
Wherein a part or the whole of the flow electrode is replaced with a flow electrode having a relatively lower concentration than a flow electrode flowing through the flow electrode device when the salt concentration of the flow electrode is not less than a predetermined concentration.
The method according to claim 2, wherein
Wherein part or all of the flow electrode is replaced with a flow electrode having a relatively lower concentration than the flow electrode flowing in the flow electrode device at predetermined time intervals.
At least one flow electrode device of claim 1;
A flow electrode supply unit for supplying a flow electrode to the flow cathode flow path and the flow cathode flow channel again by flowing together the flow electrode passing through the flow anode flow path and the flow anode passing through the flow cathode flow path;
An electrolyte supply unit for supplying an electrolyte to the flow electrode device;
A power supply for supplying power to the flow electrode device;
An electrode regeneration controller for measuring and collecting the saline concentration of the flow electrode;
A fluid-liquid separator for separating and discharging the concentrated fluid from the separated flow electrodes;
And a flow electrode regeneration unit for regenerating the flow electrode regenerated by the flow electrode supply unit or the flow electrode device by adding a fluid having a relatively low concentration to the flow electrode from which the fluid is separated.
A condensate desalination apparatus according to any one of claims 3 to 5;
A flow cathode flow passage through which the flow cathode supplied from the flow anodic channel of the storage and desorption device flows, a flow cathode flow passage through which the flow cathode supplied from the flow cathodic flow passage of the storage and desorption device flows, A recovering side flow electrode device disposed at a rear end of the accumulation type desalination device so that an electrolyte flowing between the flow paths has an electrolyte flow path; And
And a power device connected to the flow anode flow path and the flow cathode flow path of the collection side flow electrode device to introduce a current generated therein,
Wherein the flow anode and the flow cathode that have passed through the collection-side flow electrode device are introduced into the flow electrode supply portion of the storage and desalination device.
The method according to claim 6,
Wherein a flow anode control unit is disposed between the flow anodic flow path of the storage and desorption apparatus and the flow anodic flow path of the recovering side flow electrode apparatus, and between the flow cathodic flow path of the storage desalination apparatus and the flow cathode flow path of the collection- A flow cathode control unit is disposed,
Wherein the flow anode control unit and the flow cathode control unit are connected to the flow electrode supply unit,
Wherein the flow anode control unit adjusts the amount of the flow anode supplied from the flow anodic channel of the storage desalination unit to be supplied to each of the flow anodic channel and the flow electrode supply unit of the collection flow-
Wherein the flow cathode control unit controls the amount of the flow cathode supplied from the flow cathode flow path of the storage desalination unit to the flow cathode flow path of the collection flow side electrode unit and the flow electrode supply unit, Recovery device.
The method according to claim 6,
Wherein a flow anode storage portion is disposed between the flow anodic flow path of the storage and desorption device and the flow anodic flow path of the collection side flow electrode device and between the flow cathodic flow path of the storage desalination device and the flow cathode flow path of the collection side flow electrode device Wherein a flow cathode storage portion is disposed in the flow path.

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