KR20150094909A - Electrodialysis device for desalination containing metal fibers - Google Patents

Abstract

The present invention relates to a desalination electrodialysis apparatus including metal fibers. More specifically, the desalination electrodialysis apparatus includes the metal fibers and installed with electrodes, and includes a laminate structure of a concentration chamber, dilution chamber, negative ion exchange membrane, and positive ion exchange membrane in a space between the electrodes to remove the ions in seawater. The present invention can reduce initial installation costs by fabricating the desalination electrodialysis apparatus in an area reduced by 40% compared to a conventional desalination electrodialysis apparatus using plate electrodes. The present invention also cuts the metal fibers by a jigsaw to control the area occupied by the fabricated electrodes. The present invention has low power consumption and high current efficiency to improve the performance and economy.

Description

TECHNICAL FIELD [0001] The present invention relates to an electrodialysis device for desalination containing metal fibers,

More particularly, the present invention relates to an electrodialysis apparatus for desalting comprising metal fibers, and more particularly, to an electrodialysis apparatus for desalting comprising metal fibers, And an electrodialyser for desalting comprising the laminated metal fibers.

In general, desalination of seawater includes evaporation method (multi-stage flash evaporation method, multiple utility evaporation method, vapor compression method), reverse osmosis membrane method, freezing method, electrodialysis method, and reverse osmosis membrane method and electrodialysis method are mainly used for desalination of seawater.

Desalination of seawater by the reverse osmosis membrane requires high power ratio and high membrane exchange cost because it is necessary to operate at a pressure of more than 2 times of the osmotic pressure of 25 atm in order to desalinate seawater (TDS 35,000ppm) And a high energy cost is also consumed in the case of the freezing method.

The electrodialysis apparatus has an anion exchange membrane and a cation exchange membrane arranged alternately with a certain space, and the spaces between the alternately arranged anion exchange membrane and the cation exchange membranes are divided into a dilution chamber channel and a concentration chamber channel, And a direct current supplying device for supplying direct current to both ends of the dialysis enclosure.

As a prior art of the electrodialyser, Korean Patent Registration No. 10-0561189 discloses an electrodialysis apparatus having a plurality of negative, cation exchange membranes and spacers, each of which has several inner and outer water supply holes selectively in accordance with a dialysis circuit type, A small electrodialyzer comprising a combination of several cell units assembled into a tower; A direct current supplying device for supplying a direct current voltage to upper and lower electrode plates of the electrodialyser; The dialyzate, concentrated liquid, and washing liquid discharge port of the electrodialyzer are discharged to the diluting liquid discharge line, the concentrated liquid discharge line, and the washing liquid discharge lines, respectively, by the control value preliminarily inputted by the switching device, And an operation control device including a normal mode control unit, a washing mode control unit, and a reverse mode control unit for repeatedly and sequentially controlling the operation mode and the repetitive mode of the seawater desalination apparatus.

In addition, Korean Patent No. 10-0899290 discloses a method in which when a seawater or a deep seawater is supplied into a desalting chamber provided in a salt extraction chamber while a direct current is applied from a rectifier to an anode and a cathode provided outside the desalination chamber to form an electric field in the desalting chamber, , The cation moves to the salt extraction chamber through the cation exchange membrane on the cathode side and the anion passes through the anion exchange membrane on the anode side to the salt extraction chamber and the salt in the desalination chamber is contained in the desalted seawater There is provided an apparatus for desalting salt by extracting salinity by an electrical attraction.

In the case of the conventional electrodialysis method, the salt removal rate from seawater is excellent, but since the plate electrode is generally used, the concentration of ions decreases toward the upper side of the flow path, which causes a problem of unnecessary power consumption.

Korean Patent No. 10-0561189 Korean Patent No. 10-0899290

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an electrodeposition method in which woven metal fibers are used as electrodes in an electrodialysis process, Which is characterized in that the consumption of water and the removal efficiency of ions are improved, and an object thereof is to provide an electrodialysis apparatus for desalting containing a metal fiber.

In order to achieve the above object, the present invention provides, in one aspect,

An electrodialysis device comprising metal fibers,

The anode 1 and the cathode 2 are connected to the cathode 3 and the anion exchange membrane 4 and the dilution chamber 5, the cation exchange membrane 6, the concentration chamber 3, the cathode plate 7, And a support (1) are sequentially laminated,

The anion exchange membrane 4, the dilution chamber 5, the cation exchange membrane 6, and the concentration chamber 3 may have a plurality of repeating structures,

The concentrating chamber (3) and the dilution chamber (5) are provided with a space therein to provide a flow path,

Wherein the laminates are formed on the upper or lower part of the plate to form a passage for the raw water, the concentrated water and the diluted water.

According to the present invention, it is possible to reduce the initial facility cost by using an electrode having a metal fiber in a reduced area of 40% when using an electrode including a metal fiber, and to control the area of the electrodialysis device Thereby reducing power consumption and improving current efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a structure of a device and a flow chart of raw water, concentrated water, and dilution water; FIG.
2 is an assembled side view of an electrodialysis apparatus for desalination.
3 is a plan view of an electrode part of an electrodialysis unit for desalination.
4 is a plan view of a hole enlarged in a 'U' shape according to the present invention.

The present invention, in one aspect,

An electrodialysis device comprising metal fibers,

A cathode plate, a concentrating chamber, an anion exchange membrane, a dilution chamber, a cation exchange membrane, a concentrating chamber, an anode plate, and a support are sequentially stacked in accordance with the flow of the flow path,

The anion exchange membrane, the dilution chamber, the cation exchange membrane, and the concentration chamber may have a plurality of repeating structures,

Wherein the concentrating chamber and the diluting chamber are provided with a space therein to provide a flow path,

Wherein the laminates are formed on the upper or lower part of the plate to form a passage for the raw water, the concentrated water and the diluted water.

Hereinafter, an electrodialysis apparatus for desalting containing metal fibers according to the present invention will be described in more detail with reference to the accompanying drawings.

1 and 2, the electrodialysis apparatus according to the present invention includes a support 1, a positive electrode plate 2, a concentration chamber 3, an anion exchange membrane 4, a dilution chamber 5, A cation exchange membrane 6, a concentration chamber 3, a cathode plate 7, and a support 1 are sequentially laminated.

The anion exchange membrane (4), the dilution chamber (5), the cation exchange membrane (6), and the concentration chamber (3)

It is preferable that the method of bonding the laminate is such that the support body 1 is pierced and tightly bonded by a bolt and a nut in a liquid-tight manner. However, various other methods of fixing the laminate can be adopted.

The support comprises a support into which raw water and concentrated water are introduced, and a support to which concentrated water and dilute water are discharged.

The supporter through which the raw water and the concentrated water are introduced has a hole at the lower end thereof, and the support body through which the concentrated water and the dilution water are discharged is provided with a hole at the upper end thereof to provide a flow path.

The raw water and the concentrated water are introduced by a pump (not shown), and the concentrated water or diluted water passing through the laminate is discharged through the discharge hole (hole) of the support body 1, The ion removal efficiency can be measured through an electrical conductivity or TDS measurement sensor installed in the hole (hole).

The positive electrode plate 2 and the negative electrode plate 7 are composed of the electrode portion 10 as shown in Fig.

The electrode unit 10 includes an electrode 11 on the negative (-) or positive (+) electrode on the upper side, a metal fiber net 12 that is in contact with a lower layer of the electrode and is woven with metal fibers, 13).

The electrode unit 10 may further include an O-ring 14 installed in the hole 13.

The O-ring 14 prevents mixing of raw water, concentrated water, and dilution water, and prevents raw water, concentrated water, and dilution water from directly coming into contact with the metal fiber net, thereby preventing current leakage.

The metal fiber net of the positive electrode plate 2 and the negative electrode plate 7 is preferably used by weaving a single metal component selected from Ti, Al, Ni, Cu and STS, and it is most preferable to use STS.

The upper portion of the electrode portion is provided with a space formed in the concentrating chamber (3), and a space formed in the dilution chamber provides a flow path to the dilution water.

The size of the space of the concentration chamber 3 and the dilution chamber 5 may vary according to the size of the apparatus, and it is preferable that the size of the space is 0.6 to 9.36 cm ³ .

The laminate is formed at the upper portion or the lower portion with separate holes for forming the passages of the raw water, the concentrated water and the diluted water.

The diameter of the holes 13 of the concentrating chamber 3 and the dilution chamber 5 may vary according to the size of the apparatus and is preferably formed to a size of 0.6 to 1.5 cm.

It is preferable that some of the holes of the concentrating chamber 3 and the dilution chamber 5 are formed of the holes 15 of the "U" -shaped shape as illustrated in Fig. 4 and communicate with the space formed therein Do.

The size of the anion exchange membrane 4 and the cation exchange membrane 6 may vary depending on the size of the apparatus.

Hereinafter, the process and principle of desalination in an electrodialysis apparatus for desalting containing metal fibers will be described.

The raw water and the concentrated water are introduced by a pump (not shown), and the concentrated water or diluted water passing through the laminate is discharged through the discharge hole (hole) of the support body 1.

The raw water and the concentrated water are supplied to the concentration chamber (3) and the dilution chamber (5) by the pump. When the direct current is applied from the rectifier to the positive electrode and the negative electrode, an electric field is formed. Exchange membrane and the (-) ions of the raw water permeate through the cation-exchange membrane to produce diluted water, and ions are accumulated in the concentrated water of the concentrating chamber.

(+) Ion is concentrated in the concentrated chamber where the space is formed by the lamination of the positive electrode plate and the anion exchange membrane, and the negative electrode plate and the positive ion exchange membrane are concentrated in the concentrated chamber where the space is formed by the lamination of the negative electrode plate and the cation exchange membrane, +) Ion and (-) ion can be concentrated.

(Na ⁺ , K ⁺ , Ca ^{2 +} , Mg ^{2 +} , Fe ₂ ^{2 +} and the like) contained in the raw water permeating the dilution chamber 5 by electrophoresis, when the laminate forms a regular field by the electrode, (Cl ^- , Br ^- , NO ₃ ^- , SO ₄ ^{2 -} , HCO ₃ ^-, and the like) permeate through the cation exchange membrane (6) of the anode side to the concentration chamber (3) And the ions contained in the seawater are removed through the process of moving to the concentrating chamber (3).

It may be desirable to provide an electrical conductivity or TDS measurement sensor at the outlet (hole) of the support through which the treated diluted water is discharged to measure the ion removal efficiency and perform cleaning if necessary.

Particularly, when the desalination is prolonged for a long period of time, the ion removal efficiency is decreased. Therefore, the ion removal efficiency of the concentration chamber 3 is continuously measured through the electrical conductivity or TDS measurement sensor, May be more preferable.

According to the measurement result, the positive (+) pole voltage is applied to the positive electrode plate 2, and the positive (+) voltage is applied to the negative electrode plate 7.

Hereinafter, the flow of the raw water, the concentrated water and the diluting water will be described in detail.

The raw water passes through the holes in one direction formed in the lower part of the laminate and the dilution chamber.

More specifically, the raw water is formed in the lower part of the support 1, the cathode plate 2, the concentration chamber 3, the anion exchange membrane 4, the dilution chamber 5, the cation exchange membrane 6 and the concentration chamber 3 Through the hole.

The concentrated water includes seawater, flows in separate one-direction holes formed in the lower portion of the laminate, branches in the concentration chamber 3, passes through the holes in the other one direction formed at the lower portion and the upper portion, The efficiency of the current can be increased.

Concretely, the concentrated water flows through the concentrate chamber 3, the anion exchange membrane 4, the dilution chamber 5, the cation exchange membrane 6 and the concentrating chamber 3 via the support 1, the positive electrode plate 2, (3), the anion exchange membrane (4), the anion exchange membrane (4), the anion exchange membrane (4), and the anion exchange membrane Through the holes formed in the upper part of the dilution chamber 5, the cation exchange membrane 6, the concentration chamber 3, the cathode plate 7 and the support body 1.

On the other hand, the dilution water is generated from the raw water that has passed through the space formed in the dilution chamber, and passes through the one directional holes formed in the upper portion diagonal to the raw water and the dilution chamber (5).

Specifically, the dilution chamber 5, the cation exchange membrane 6, the concentration chamber 3, the anion exchange membrane 4, the dilution chamber 5, the cation exchange membrane 6, the concentration chamber 3, the cathode plate 7, Is moved through a separate hole formed in the upper part of the supporting body (1), and the holes of the raw water and the diluting water are in diagonal positions.

In addition, there is no cross flow between the concentrating chamber (3) and the dilution chamber (5) because the passage through which the concentrated water, the raw water and the dilution water are introduced and the discharge passage are separated from each other, do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and changes may be made in the present invention by adding, changing, deleting, or adding components.

1: Support body 2: Positive electrode plate
3: concentration chamber 4: anion exchange membrane
5: Dilution chamber 6: Cation exchange membrane
7: cathode plate 10: electrode part
11: electrode 12: metal mesh
13: Hall 14: O-ring
15: 'U' shaped hole

Claims (6)

An electrodialysis device comprising metal fibers,
A cathode plate, a concentrating chamber, an anion exchange membrane, a dilution chamber, a cation exchange membrane, a concentrating chamber, an anode plate, and a support are sequentially stacked in accordance with the flow of the flow path,
The anion exchange membrane, the dilution chamber, the cation exchange membrane, and the concentration chamber may have a plurality of repeating structures,
Wherein the concentrating chamber and the diluting chamber are provided with a space therein to provide a flow path,
Wherein the laminates are formed on the upper or lower part of the upper surface or the lower surface of the plate so as to form passages for the raw water, the concentrated water and the diluted water. The method according to claim 1,
Wherein negative ions are supplied to the positive electrode plate, and positive ions are supplied to the negative electrode plate, whereby the accumulated ions are washed away in the concentrating compartment. The method according to claim 1,
Wherein the positive electrode plate and the negative electrode plate are made of an electrode portion including metal fibers,
The electrode unit may include an upper negative electrode (-) or a positive electrode (+), a metal fiber net contacting the lower layer of the electrode and woven with metal fibers, and O-ring holes formed in the lower portion of the metal fiber net The electrodialysis device comprising: The method according to claim 1,
Wherein some of the holes of the concentrating chamber and the dilution chamber are formed of a "U" -shaped hole, and have a structure communicating with a space formed therein. The method according to claim 1,
Wherein the dilution water is generated in the process of passing the raw water through the dilution chamber, wherein the (+) ion of the raw water passes through the anion exchange membrane and the (-) ion of the raw water passes through the cation exchange membrane and is accumulated in the concentration chamber. And an electrodialysis device for desalting. The method according to claim 1,
The raw water passes through the holes in one direction formed in the lower portion of the laminate and the dilution chamber,
The dilution water is generated from the raw water that has passed through the space formed in the dilution chamber, passes through the one directional holes formed in the upper portion diagonal to the raw water and the dilution chamber,
Characterized in that the concentrated water flows in separate one-direction holes formed in the lower part of the laminate and branches in the concentration chamber and passes through holes in one direction formed in the lower part and the upper part. .

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