CN111547826A - Integration heap flowing electrode electric capacity deionization device - Google Patents
Integration heap flowing electrode electric capacity deionization device Download PDFInfo
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- CN111547826A CN111547826A CN202010519727.6A CN202010519727A CN111547826A CN 111547826 A CN111547826 A CN 111547826A CN 202010519727 A CN202010519727 A CN 202010519727A CN 111547826 A CN111547826 A CN 111547826A
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- exchange membrane
- current collector
- electrode
- ion exchange
- silica gel
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention relates to an integrated stacked flowing electrode capacitive deionization (FCDI) device which is suitable for increasing the treatment water quantity of an FCDI reactor and enlarging the scale of the reactor. The device comprises a main body device and accessories, wherein the main body device comprises a terminal fixing plate, a terminal current collector, an ion exchange membrane, a separation net and an embedded current collector, and the accessories comprise a silica gel gasket, a silica gel tube and a screw rod. According to the invention, through the use of the embedded current collector, the traditional single-chamber FCDI reactor can be divided into a plurality of continuous independent units, each unit is a complete FCDI reactor, and two adjacent units share one current collector, so that the reactor building cost is saved, and the economic performance is strong.
Description
Technical Field
The invention belongs to the technical field of environment, relates to water treatment, and particularly relates to an integrated stacked flow electrode capacitive deionization (FCDI) device.
Background
The FCDI technology is an emerging electrochemical technology in recent years, and mainly utilizes the function of capacitance to enable charged ions in inlet water to directionally migrate into an electrode chamber and be adsorbed in an electric double layer structure on the surface of an electrode material, so that the charged ions in the inlet water are removed. Compared with the traditional fixed electrode Capacitive Deionization (CDI) technology, the FCDI technology uses flowing electrode suspension to replace the traditional fixed electrode, and the adsorption performance of the reactor is greatly improved.
The FCDI technology has originated in the last 60 years, is mainly used in the field of seawater/brackish water desalination, has continuously increased research heat and gradually widened application field in recent years due to the advantages of low consumption, high efficiency, no secondary pollution and the like, and is successfully applied to the fields of drinking water deep treatment, industrial wastewater treatment, domestic sewage resource recovery and the like. The flat-plate FCDI reactor, the most commonly used reactor configuration at present, etches a flow channel on a flat-plate current collector to form an electrode chamber in which an electrode suspension flows; the ion exchange membrane is arranged on the inner side of the current collector and has the functions of selectively permeating ions and separating the electrode chamber and the water inlet chamber. The wastewater to be treated flows through the water inlet chamber and is uniformly distributed in the whole chamber under the action of the separation net, so that the phenomenon of short flow is avoided.
In a flat-plate FCDI reactor, in order to shorten the directional migration distance of charged ions, the thickness of a water inlet chamber is usually controlled to be less than 10mm, so that the treatment capacity of the reactor is small, and how to effectively improve the treatment capacity of the reactor, enlarge the scale of the reactor, and ensure the efficient operation of the reactor for seawater, municipal sewage, industrial wastewater and the like with huge water volume to be treated is a hot problem in recent research.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the problem of limited processing scale of the traditional FCDI reactor, the invention aims to provide an integrated stacked flow electrode capacitive deionization (FCDI) device which is convenient to operate and easy to regulate and control. The advantages of short ion migration path and high adsorption rate of the traditional flat plate type FCDI reactor are reserved, the expansion of the treatment scale of the reactor is realized, the number of embedded collectors can be adjusted according to actual treatment requirements, the reaction flexibility is higher, the important significance is realized on the improvement of the overall process efficiency and the control of the operation cost, and the method is suitable for the improvement of the treatment water quantity of the FCDI reactor and the expansion of the treatment scale.
In order to achieve the purpose, the invention adopts the technical scheme that:
an integrated stacked flowing electrode capacitive deionization device comprises a left terminal fixing plate 11 and a right terminal fixing plate 12 which are opposite in parallel, a left terminal collector 21 is disposed on the right side surface of the left terminal fixing plate 11, a right terminal collector 22 is disposed on the left side surface of the right terminal fixing plate 12, a cation exchange membrane 41 and an anion exchange membrane 42 or an anion exchange membrane 42 and a cation exchange membrane 41 are respectively disposed in close contact with the right side surface of the left terminal collector 21 and the left side surface of the right terminal collector 22, an annular silica gel gasket 5 is provided between the cation exchange membrane 41 and the anion exchange membrane 42, and by the thickness of the silica gel gasket 5, a water inlet chamber is formed in the annular space, a water inlet and a water outlet are formed on each terminal fixing plate, each current collector and each ion exchange membrane, and a silicone tube penetrates through the silicone tube to form a water inlet and outlet loop with each water inlet chamber respectively.
Further, a plurality of embedded current collectors 3 are uniformly arranged between the left terminal current collector 21 and the right terminal fixing plate 12 at intervals, a space interval is formed between every two adjacent current collectors, a cation exchange membrane 41 or an anion exchange membrane 42 is tightly attached to two side surfaces of each embedded current collector 3, the cation exchange membrane 41 and the anion exchange membrane 42 are oppositely arranged in each space interval to form a pair of ion exchange membranes, and an annular silica gel gasket 5 is arranged between each pair of ion exchange membranes.
Furthermore, the side surface of each current collector, which is tightly attached to the ion exchange membrane, is etched with a rotary electrode liquid flow channel, each terminal fixing plate and each current collector are provided with an electrode liquid flow inlet and an electrode liquid flow outlet, and a silicone tube penetrates into the silicone tube to form an electrode liquid inlet and outlet loop with each electrode liquid flow channel.
Further, the water inlet and the water outlet are positioned at two opposite corners of each terminal fixing plate, each current collector and each ion exchange membrane, and the electrode liquid flow inlet and the electrode liquid flow outlet are positioned at the other two opposite corners of each terminal fixing plate and each current collector.
Further, the gyration-shaped electrode liquid flow channel adopts a semicircular connecting channel at the gyration position.
Furthermore, in the water inlet and outlet loop, the water flow direction in the water inlet chamber is an upward flow, and in the electrode liquid loop, the electrode liquid flow direction in the electrode liquid flow channel is an upward flow.
Further, be provided with in the annular space of silica gel gasket 5 and be parallel with ion exchange membrane separate the net 6, separate the interior border that the outer border of net 6 is connected at silica gel gasket 5.
Further, the area of the separation net 6 is larger than or equal to the effective contact area of the ion exchange membrane and the electrode chamber.
Furthermore, the outer contour of the silica gel gasket 5 is consistent with the cation exchange membrane 41 and the anion exchange membrane 42, and is tightly attached to the cation exchange membrane 41 and the anion exchange membrane 42, and the inner annular space forms a water inlet chamber.
In the present invention, each terminal fixing plate, each current collector, each ion exchange membrane, and each silicone gasket 5 are fixed by a screw.
Compared with the prior art, the invention has the beneficial effects that:
the invention expands the processing scale of the reactor through the use of the embedded current collectors and transversely expands the processing capacity of the reactor in a membrane stack-like mode.
The adjacent units of the invention can share the same current collector, and the current collector has high price and is the main part of the reactor construction cost, and the reactor construction cost is greatly reduced by using the embedded current collector, thereby laying the foundation for commercial popularization and application.
The number of the embedded current collectors can be flexibly regulated according to the actual processing requirement, the embedded current collectors are developed in a modular form, adjacent units are mutually independent and do not influence each other, and the embedded current collectors are convenient to regulate and control in actual operation.
Drawings
Fig. 1 is a schematic view of the structure of the present invention (omitting the embedded current collectors).
Fig. 2 is a schematic cross-sectional view of the present invention (including an embedded current collector).
Fig. 3 is a schematic plan view of a terminal holding plate of the present invention.
Fig. 4 is a front view of the terminal collector of the present invention.
Fig. 5 is a sectional view a-a in fig. 4.
Fig. 6 is a sectional view taken along line B-B in fig. 4.
Fig. 7 is a three-dimensional view of the terminal current collector of the present invention.
Fig. 8 is a three-dimensional view of an in-line current collector of the present invention.
FIG. 9 is a schematic illustration of the effect of a two unit FCDI reactor process.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
Example 1
As shown in fig. 1, an integrated stacked flowing electrode capacitive deionization device includes a main body device and a fitting, the main body device includes: terminal fixed plate, terminal collector, ion exchange membrane etc. and the accessory includes silica gel packing ring, silicone tube, screw rod etc..
Wherein the terminal fixing plates include a left terminal fixing plate 11 and a right terminal fixing plate 12 which are parallel and opposite to each other. The terminal collector includes a left terminal collector 21 disposed at a right side of the left terminal fixing plate 11 and a right terminal collector 22 disposed at a left side of the right terminal fixing plate 12. The ion exchange membrane includes a cation exchange membrane 41 disposed closely to the right side of the left terminal collector 21 and an anion exchange membrane 42 disposed closely to the left side of the right terminal collector 22. Those skilled in the art will appreciate that the positions of the cation exchange membrane 41 and the anion exchange membrane 42 may be reversed.
The silica gel gasket 5 is annular, the outer contour of the silica gel gasket is consistent with that of the cation exchange membrane 41 and the anion exchange membrane 42, the silica gel gasket is arranged between the cation exchange membrane 41 and the anion exchange membrane 42 in a clinging mode, and a water inlet cavity is formed in the annular space of the silica gel gasket 5 by the thickness of the silica gel gasket. A silica gel gasket 5 can also be additionally arranged between the ion exchange membrane and the side surface of the current collector.
Wherein can set up the net 6 that separates parallel with ion exchange membrane in the annular space of silicone gasket 5, separate the outside border of net 6 and connect the interior border at silicone gasket 5, separate about the aperture 1mm of net 6, area more than or equal to ion exchange membrane and electrode chamber's effective area of contact plays the effect of even portion water, preventing the short-term flow.
And water inlets and water outlets are formed on the terminal fixing plates, the current collectors and the ion exchange membranes, and a silicone tube penetrates through the terminal fixing plates, the current collectors and the ion exchange membranes to form water inlet and outlet loops with the water inlet chambers respectively.
The ion exchange membrane is a common commercial ion exchange membrane and has the functions of selectively permeating ions and separating the inlet water and the electrode liquid.
Fixing holes are uniformly distributed on the periphery of the terminal fixing plate, the aperture size is consistent with the diameter of the screw, and the terminal fixing plates, the current collectors, the ion exchange membranes and the silica gel gaskets 5 are fixed by the screw.
Example 2
As shown in fig. 2, in addition to the embodiment 1, a plurality of embedded current collectors 3 are further included, and the embedded current collectors 3 are uniformly spaced between the left terminal current collector 21 and the right terminal fixing plate 12 with a space between adjacent current collectors.
Two side surfaces of each embedded current collector 3 are respectively provided with a cation exchange membrane 41 or an anion exchange membrane 42 in a close fit manner, in each space interval, the cation exchange membrane 41 and the anion exchange membrane 42 are oppositely arranged to form a pair of ion exchange membranes, a silica gel gasket 5 is arranged between each pair of ion exchange membranes to form a plurality of water inlet chambers, each water inlet chamber and the structure on two sides of the water inlet chamber are a processing unit, the unit 1, the unit 2, the unit … …, the unit n-1 and the unit n are shown in the figure, n units are totally included, a repeatable structure is shown in a dotted line frame in the figure 2, and one processing unit can be additionally arranged when one processing unit is additionally arranged.
Preferably, the terminal fixing plate, the terminal current collector, the ion exchange membrane, the silica gel gasket and the embedded current collector are consistent in size and position, and the size of the fixing hole are also consistent.
The use of embedded collector is passed through to this embodiment, can divide into a plurality of continuous independent units with traditional single chamber FCDI reactor, and every unit is a complete FCDI reactor, and two adjacent units share a collector, have saved the reactor and have built the cost, and economic performance is stronger. In practical application, the number of reactor units and the amount of water to be treated can be controlled by adjusting the number of components in the dashed line box in fig. 2.
Example 3
Referring to fig. 1, 2, 3, 4, 5, 6, 7, and 8, the right side surface of the left terminal collector 21, the left side surface of the right terminal collector 22, and both side surfaces of each embedded collector 3 are etched with a turning-shaped electrode liquid flow channel using a semicircular connecting channel at the turning. The width and the depth of the flow channel should be less than 5mm (recommended to be 2mm), so that the electrode liquid can flow in the flow channel conveniently, and the phenomena of deposition, flow blockage and the like of electrode particles can be effectively avoided. The number can be flexibly adjusted according to the actual treatment requirement, and the adjacent units share the same current collector, thereby greatly reducing the cost of the reactor.
And each terminal fixing plate and each current collector are provided with an electrode liquid flow inlet and an electrode liquid flow outlet, and a silicone tube penetrates into the terminal fixing plates and each current collector to respectively form an electrode liquid inlet and outlet loop with each electrode liquid flow channel.
In a preferred structure, the water inlet and the water outlet may be located at two opposite corners of each terminal fixing plate, each current collector and each ion exchange membrane, and the electrode liquid flow inlet and the electrode liquid flow outlet are located at the other two opposite corners of each terminal fixing plate and each current collector.
In a preferred structure, the water flow direction in the water inlet chamber is an upward flow in the water inlet and outlet circuit, and the electrode liquid flow direction in the electrode liquid flow passage is an upward flow in the electrode liquid circuit.
Taking a 3-unit structure as an example, the whole device is of a flat-plate symmetrical structure, the outermost side is provided with a pair of terminal fixing plates (a left terminal fixing plate 11 and a right terminal fixing plate 12) which are arranged in parallel and oppositely, the inner side is provided with a pair of terminal current collectors (a left terminal current collector 21 and a right terminal current collector 22), and two embedded current collectors 3 are arranged in the middle, so that the inside of the reactor is divided into 3 independent processing units; a pair of ion exchange membranes are oppositely arranged in parallel close to the current collector on the inner side of the current collector of each unit, a silica gel gasket 5 and a separation net 6 are arranged in the middle of the current collector, a water inlet chamber is formed through the thickness of the silica gel gasket 5, a gap with the same size as the separation net 6 is reserved in the middle of the silica gel gasket 5, the water inlet is uniformly distributed in the whole chamber under the action of the separation net 6, and all the components are fixed by screws. After entering the interior of the device, the inlet water is uniformly divided into three paths through the arrangement of inlet water pipelines, and the three paths respectively enter the inlet water chambers of 3 units, wherein the flowing directions of the inlet water chambers are upward flows. After entering the device, the electrode solution is averagely divided into 6 paths by pipeline arrangement, and respectively enters the two electrode chambers of each unit, and the flow direction is also upward flow. Thus constituting a 3-unit integrated stacked reactor.
The integrated stacked FCDI reactor is applied to the urban sewage desalination treatment, taking a two-unit FCDI reactor as an example, and comprises 1 embedded current collector, and the integrated stacked FCDI reactor specifically comprises the following components: terminal fixing plate-terminal current collector-anion exchange membrane-separation net-cation exchange membrane-embedded current collector-cation exchange membrane-separation net-anion exchange membrane-terminal current collector-terminal fixing plate. The inlet water in the unit 1 is K with the concentration of 100mM2SO4The solution and the inlet water in the unit 2 are simulated urban sewage, wherein NH4The concentration of Cl is 100mM, CaCl2In a concentration of 50mM, MgCl2Is 50 mM; the volumes of wastewater to be treated in the two units are both 600mL, the volume of electrode liquid is 150mL of commercial capacitance activated carbon suspension with the weight percent of 5%, the working voltage in each unit is 1.2V, the flow rates of the electrode liquid and inlet water are both 5.00mL/min, and the adsorption conditions of the reactor on two different electrolyte solutions are inspected.
From the processing results of fig. 9, it can be seen that the electrical conductivities in the two units both continuously decrease along with the progress of the reaction process, and there is no obvious difference in the two units, so that the desalting function can be achieved, which indicates that the processing effect of the reactor cannot be affected by the enlargement of the reactor scale, and on the basis of ensuring the progress of the desalting process, the effect of improving the processing capacity of the reactor is achieved.
In conclusion, the invention is simple to apply and implement, the processing capacity of the reactor can be improved by using the embedded current collector on the basis of the existing reactor, and the adjacent units share one current collector, so that the construction cost of the reactor is obviously reduced, and a feasible idea is provided for the scale expansion of the FCDI reactor.
Claims (10)
1. The utility model provides an integration heap flowing electrode electric capacity deionization device, characterized in that, including parallel relative left side terminal fixed plate (11) and right side terminal fixed plate (12), set up left side terminal current collector (21) at the right flank of left side terminal fixed plate (11), the left flank of right side terminal fixed plate (12) sets up right side terminal current collector (22), the right flank of left side terminal current collector (21) and the left flank of right side terminal current collector (22) are hugged closely respectively and are provided with cation exchange membrane (41) and anion exchange membrane (42) or anion exchange membrane (42) and cation exchange membrane (41), set up annular silica gel packing ring (5) between cation exchange membrane (41) and anion exchange membrane (42), utilize the thickness of silica gel packing ring (5), form into water cavity in its annular space, each terminal fixed plate, Water inlets and water outlets are arranged on the current collectors and the ion exchange membranes, and the current collectors and the ion exchange membranes penetrate through silicone tubes to form water inlet and outlet loops with the water inlet chambers respectively.
2. The capacitive deionization device of the integrated stacked flowing electrode according to claim 1, wherein a plurality of embedded current collectors (3) are uniformly arranged between the left terminal current collector (21) and the right terminal fixing plate (12) at intervals, a space interval is formed between every two adjacent current collectors, both side surfaces of each embedded current collector (3) are closely provided with a cation exchange membrane (41) or an anion exchange membrane (42), in each space interval, the cation exchange membrane (41) and the anion exchange membrane (42) are oppositely arranged to form a pair of ion exchange membranes, and an annular silica gel gasket (5) is arranged between each pair of ion exchange membranes.
3. The integrated stacked flow electrode capacitive deionization device according to claim 1 or 2, wherein the side surface of each current collector, which is tightly attached to the ion exchange membrane, is etched with a rotary electrode liquid flow channel, each terminal fixing plate and each current collector are provided with an electrode liquid flow inlet and an electrode liquid flow outlet, and a silicone tube is penetrated to form an electrode liquid inlet and outlet loop with each electrode liquid flow channel.
4. The integrated stacked flow electrode capacitive deionization device according to claim 3, wherein the water inlet and water outlet are located at two opposite corners of each terminal fixing plate, each current collector and each ion exchange membrane, and the electrode liquid flow inlet and electrode liquid flow outlet are located at the other two opposite corners of each terminal fixing plate and each current collector.
5. The integrated stacked flowing electrode capacitive deionization device according to claim 3, wherein the gyratory-shaped electrode liquid flow channels employ semicircular connecting channels at the gyrations.
6. The integrated stacked flow electrode capacitive deionization device of claim 5, wherein the water flow direction in the water inlet chamber in the water inlet and outlet circuit is upward flow, and the electrode liquid flow direction in the electrode liquid flow channel in the electrode liquid circuit is upward flow.
7. The integrated stacked flow electrode capacitive deionization device according to claim 1, wherein a separation net (6) parallel to the ion exchange membrane is arranged in the annular space of the silica gel gasket (5), and the outer edge of the separation net (6) is connected to the inner edge of the silica gel gasket (5).
8. The integrated stacked flow electrode capacitive deionization device according to claim 7, wherein the area of the spacer mesh (6) is equal to or larger than the effective contact area of the ion exchange membrane and the electrode chamber.
9. The integrated stacked flow electrode capacitive deionization device according to claim 1, 7 or 8, wherein the outer contour of the silica gel gasket (5) is consistent with the cation exchange membrane (41) and the anion exchange membrane (42), and is arranged to be tightly attached to the cation exchange membrane (41) and the anion exchange membrane (42), and the inner annular space forms a water inlet chamber.
10. The integrated stacked flow electrode capacitive deionization unit according to claim 1 or 7 or 8, wherein each terminal fixing plate, each current collector, each ion exchange membrane and each silicone gasket (5) are fixed by screws.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010519727.6A CN111547826A (en) | 2020-06-09 | 2020-06-09 | Integration heap flowing electrode electric capacity deionization device |
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| CN202010519727.6A CN111547826A (en) | 2020-06-09 | 2020-06-09 | Integration heap flowing electrode electric capacity deionization device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479320A (en) * | 2020-11-30 | 2021-03-12 | 重庆大学 | Series-stacked desalination system and desalination method based on flow electrodes |
| CN112939158A (en) * | 2021-02-02 | 2021-06-11 | 同济大学 | Flow electrode capacitance deionization and amplification device based on front current collector |
| CN113087089A (en) * | 2021-04-26 | 2021-07-09 | 中南大学 | Stacked three-dimensional rocking chair type capacitive deionization device and deionization method |
-
2020
- 2020-06-09 CN CN202010519727.6A patent/CN111547826A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479320A (en) * | 2020-11-30 | 2021-03-12 | 重庆大学 | Series-stacked desalination system and desalination method based on flow electrodes |
| CN112479320B (en) * | 2020-11-30 | 2022-08-19 | 重庆大学 | Series-stacked desalination system and desalination method based on flow electrodes |
| CN112939158A (en) * | 2021-02-02 | 2021-06-11 | 同济大学 | Flow electrode capacitance deionization and amplification device based on front current collector |
| NL2030218A (en) | 2021-02-02 | 2022-09-08 | Univ Tongji | Flow-electrode capacitance deionization amplification device based on front current collector |
| NL2030218B1 (en) | 2021-02-02 | 2022-10-10 | Univ Tongji | Flow-electrode capacitance deionization amplification device based on front current collector |
| CN113087089A (en) * | 2021-04-26 | 2021-07-09 | 中南大学 | Stacked three-dimensional rocking chair type capacitive deionization device and deionization method |
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