CN111547826A - Integration heap flowing electrode electric capacity deionization device - Google Patents

Abstract

The invention relates to an integrated stacked flow electrode capacitive deionization (FCDI) device, which is suitable for increasing the treated water volume of an FCDI reactor and expanding the scale of the reactor. The device includes a main device and accessories, the main device includes a terminal fixing plate, a terminal current collector, an ion exchange membrane, a partition net, and an embedded current collector, and the accessories include a silicone gasket, a silicone tube, and a screw. The present invention can divide the traditional single-chamber FCDI reactor into a plurality of continuous independent units through the use of the in-line current collector, each unit is a complete FCDI reactor, and two adjacent units share one The current collector saves the construction cost of the reactor and has strong economic performance.

Description

An Integrated Stacked Flow Electrode Capacitive Deionization Device

technical field

The invention belongs to the field of environmental technology, relates to water treatment, and particularly relates to an integrated stacking flow electrode capacitive deionization (FCDI, flow electrode capacitive deionization) device.

Background technique

FCDI technology is an emerging electrochemical technology in recent years. It mainly uses the function of capacitance to make the charged ions in the influent migrate to the electrode chamber in a directional way, and be adsorbed in the electric double layer structure on the surface of the electrode material, so as to realize the control of the influent water. Removal of charged ions. Compared with the traditional fixed electrode capacitive deionization (CDI) technology, the FCDI technology uses a flowing electrode suspension instead of the traditional fixed electrode, which greatly improves the adsorption performance of the reactor.

FCDI technology originated in the 1960s and is mainly used in the field of seawater/brackish water desalination. In recent years, due to its advantages of low consumption, high efficiency, and no secondary pollution, the research interest has continued to rise, and the application field has gradually expanded. Successful applications It is used in advanced drinking water treatment, industrial wastewater treatment, domestic sewage resource recovery and other fields. The flat-plate FCDI reactor is currently the most commonly used reactor configuration. The flow channel is etched on the flat-plate current collector to form an electrode chamber, in which the electrode suspension flows; the ion exchange membrane is installed inside the current collector, At the same time, it plays the role of ion selective permeation and separation of the electrode chamber and the water inlet chamber. The waste water to be treated flows through the water inlet chamber, and is evenly distributed in the entire chamber through the action of the partition screen, so as to avoid the phenomenon of short flow.

In the flat-plate FCDI reactor, in order to shorten the directional migration distance of charged ions, the thickness of the inlet chamber is usually controlled below 10mm, which results in a small processing capacity of the reactor. How to effectively improve the treatment capacity of the reactor, expand the scale of the reactor, and ensure the efficient operation of the reactor at the same time, has become a hot research topic in recent years.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the prior art and solve the problem that the processing scale of the traditional FCDI reactor is limited, the purpose of the present invention is to provide an integrated stacked flow electrode capacitive deionization (FCDI) device that is convenient to operate and easy to control, based on the traditional Flat-plate configuration FCDI reactor, through the use of in-line current collector, the interior of the reactor is divided into multiple independent units, each unit can complete the capacitive deionization process, and adjacent units can share the same one collector. It not only retains the advantages of short ion migration path and fast adsorption rate of the traditional flat-plate configuration FCDI reactor, but also realizes the expansion of the processing scale of the reactor. The high reaction flexibility is of great significance to the improvement of the overall efficiency of the process and the control of operating costs.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An integrated stacked flow electrode capacitive deionization device, comprising a left terminal fixing plate 11 and a right terminal fixing plate 12 which are parallel and opposite, and a left terminal current collector 21 is arranged on the right side of the left terminal fixing plate 11 , the left side of the right terminal fixing plate 12 is provided with a right terminal current collector 22, and the right side of the left terminal current collector 21 and the left side of the right terminal current collector 22 are respectively provided with cation exchange Membrane 41 and anion exchange membrane 42 or anion exchange membrane 42 and cation exchange membrane 41, a ring-shaped silicone gasket 5 is arranged between the cation exchange membrane 41 and the anion exchange membrane 42, and the thickness of the silicone gasket 5 is used to form in its annular space In the water inlet chamber, each terminal fixing plate, each current collector and each ion exchange membrane are provided with a water inlet and a water outlet, and a silicone tube is inserted into the water inlet chamber to form a water inlet and outlet circuit respectively.

Further, several in-line current collectors 3 are evenly spaced between the left terminal current collector 21 and the right terminal fixing plate 12, and there is a space between each adjacent current collector, and each in-line current collector Both sides of the device 3 are closely arranged 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 arranged opposite to each other to form a pair of ion exchange membranes. An annular silicone gasket 5 is arranged between the exchange membranes.

Further, the sides of each current collector close to the ion exchange membrane are etched with a rotary electrode liquid flow channel, and each terminal fixing plate and each current collector are provided with an electrode liquid flow inlet and an electrode liquid flow outlet, and penetrate into the silica gel. The tubes and each electrode liquid flow channel respectively form an in-and-out electrode liquid circuit.

Further, the water inlet and the 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 each terminal fixing plate and each collector. the other two opposite corners of the flow device.

Further, a semicircular connecting channel is adopted at the turning point of the rotating electrode liquid flow channel.

Further, in the water inlet and outlet circuit, the water flow direction in the water inlet chamber is upward flow, and in the electrode liquid circuit, the electrode liquid flow direction in the electrode liquid flow channel is upward flow.

Further, a partition 6 parallel to the ion exchange membrane is arranged in the annular space of the silicone gasket 5 , and the outer edge of the partition 6 is connected to the inner edge of the silicone gasket 5 .

Further, the area of the separator 6 is greater than or equal to the effective contact area between the ion exchange membrane and the electrode chamber.

Further, 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 close 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 silica gel gasket 5 are fixed by screws.

Compared with the prior art, the beneficial effects of the present invention are:

The invention expands the processing scale of the reactor through the use of the in-line collector, and laterally expands the processing capacity of the reactor in the form of a similar membrane stack.

Adjacent units of the present invention can share the same current collector, and the current collector is expensive, which is the main part of the construction cost of the reactor. Lay the foundation for commercial promotion and application.

The number of the embedded current collectors of the present invention can be flexibly regulated according to actual processing requirements, and is developed in a modular form.

Description of drawings

FIG. 1 is a schematic view of the structure of the present invention (the in-line current collector is omitted).

FIG. 2 is a schematic cross-sectional view of the present invention (including the in-line current collector).

FIG. 3 is a schematic plan view of the terminal fixing plate of the present invention.

Fig. 4 is a front view of the terminal current collector of the present invention.

FIG. 5 is an A-A cross-sectional view of FIG. 4 .

FIG. 6 is a B-B sectional view in FIG. 4 .

Figure 7 is a three-dimensional view of the terminal current collector of the present invention.

Figure 8 is a three-dimensional view of the in-line current collector of the present invention.

Figure 9 is a schematic diagram of the treatment effect of the two-unit FCDI reactor.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1

As shown in Figure 1, an integrated stacked flow electrode capacitive deionization device includes a main device and accessories. The main device includes: a terminal fixing plate, a terminal current collector, an ion exchange membrane, etc., and the accessories include a silicone gasket and a silicone tube. , screw, etc.

The terminal fixing plate includes a left terminal fixing plate 11 and a right terminal fixing plate 12 which are parallel and opposite. The terminal current collector includes a left terminal current collector 21 provided on the right side of the left terminal fixing plate 11 and a right terminal current collector 22 provided on the left side of the right terminal fixing plate 12 . The ion exchange membrane includes a cation exchange membrane 41 closely disposed on the right side of the left terminal current collector 21 and an anion exchange membrane 42 closely disposed on the left side of the right terminal current collector 22 . Those skilled in the art will appreciate that the positions of the cation exchange membrane 41 and the anion exchange membrane 42 can be interchanged.

The silicone gasket 5 is annular, and its outer contour is consistent with the cation exchange membrane 41 and the anion exchange membrane 42. water chamber. A silica gel gasket 5 can also be added between the ion exchange membrane and the side of the current collector.

A partition 6 parallel to the ion exchange membrane can be arranged in the annular space of the silicone gasket 5, the outer edge of the partition 6 is connected to the inner edge of the silicone gasket 5, the aperture of the partition 6 is about 1mm, and the area is greater than or equal to the ion exchange membrane. The effective contact area with the electrode chamber plays the role of evenly distributing water and preventing short flow.

Each terminal fixing plate, each current collector and each ion exchange membrane are provided with a water inlet and a water outlet, and are penetrated into a silicone tube to form a water inlet and outlet loop with each water inlet chamber respectively.

The ion-exchange membrane of the present invention is a common commercial ion-exchange membrane, and at the same time plays the role of selective ion permeation and separation of influent water and electrode liquid.

Fixing holes are evenly distributed around the terminal fixing plate, and the pore size is consistent with the diameter of the screw.

Example 2

As shown in FIG. 2 , on the basis of Embodiment 1, several embedded current collectors 3 are also included, and the embedded current collectors 3 are evenly spaced on the left terminal current collector 21 and the right terminal fixing plate 12, there is a space interval between each adjacent current collector.

A cation exchange membrane 41 or an anion exchange membrane 42 is closely arranged on both sides of each inline collector 3. In each space interval, the cation exchange membrane 41 and the anion exchange membrane 42 are arranged opposite to each other to form a pair of ion exchange membranes. Membrane, a silicone gasket 5 is arranged between each pair of ion exchange membranes to form a plurality of water inlet chambers, each water inlet chamber and its two sides are structured as a processing unit, and the unit 1 and unit 2 are shown in the figure. , ......, unit n-1, unit n is a total of n units, the dashed box in Figure 2 represents a repeatable structure, each additional one can add an additional processing unit.

Preferably, the dimensions of the terminal fixing plate, the terminal current collector, the ion exchange membrane, the silica gel gasket and the embedded current collector of the present invention are all the same, and the positions and sizes of the fixing holes are also the same.

In this embodiment, through the use of the in-line 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 the two adjacent units share the same A current collector saves the construction cost of the reactor and has strong economic performance. In practical applications, the number of reactor units and the amount of treated water can be controlled by adjusting the number of components in the dotted frame in Figure 2.

Example 3

1 , 2 , 3 , 4 , 5 , 6 , 7 , and 8 , the right side of the left terminal current collector 21 , the left side of the right terminal current collector 22 , and each Both sides of the embedded current collector 3 are etched with a rotary electrode liquid flow channel, and the rotary electrode liquid flow channel adopts a semicircular connection channel at the turning point. The width and depth of the flow channel should be less than 5mm (recommended 2mm), which is convenient for the electrode liquid to flow in it, and can effectively avoid the occurrence of electrode particle deposition and block flow. The quantity can be flexibly adjusted according to the actual processing requirements, and the adjacent units share the same current collector, which greatly reduces the cost of the reactor.

Each terminal fixing plate and each current collector are provided with an electrode liquid inflow inlet and an electrode liquid outflow outlet, and are penetrated into a silicone tube to form an in-and-out electrode liquid circuit with each electrode liquid flow channel respectively.

In a preferred structure, the water inlet and outlet can 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 electrode liquid flow outlet are located at each terminal fixing plate and each current collector. the other two opposite corners.

In a preferred structure, in the water inlet and outlet circuits, the water flow direction in the water inlet chamber is upward flow, and in the electrode liquid circuit, the electrode liquid flow direction in the electrode liquid flow channel is upward flow.

Taking the 3-unit structure as an example, the device as a whole is a flat plate symmetrical structure. The outermost side is a pair of terminal fixing plates (the left terminal fixing plate 11 and the right terminal fixing plate 12), which are placed in parallel and opposite, and the inner side is a pair of terminal current collectors (left terminal collector 21 and right terminal collector 22), two in-line collectors 3 are placed in the middle, thereby dividing the inside of the reactor into 3 independent processing units; On the inner side of the collector, a pair of ion exchange membranes are placed in parallel and opposite to the collector, and a silicone gasket 5 and a separator 6 are placed in the middle. 6 voids of the same size, use the function of the separator 6 to evenly distribute the incoming water in the entire chamber, and fix all the above components with screws. After the inlet water enters the inside of the device, it is divided into three paths through the arrangement of the inlet pipes, and enters the inlet chambers of the 3 units respectively, and the flow directions are all upward flow. After the electrode liquid enters the inside of the device, it is divided into 6 channels evenly through the pipeline arrangement, and enters the two electrode chambers of each unit respectively, and the flow direction is also upward flow. This constitutes a 3-unit integrated stack reactor.

The integrated stacked FCDI reactor is applied to the desalination treatment of municipal sewage. Taking the two-unit FCDI reactor as an example, it contains an embedded current collector, and the specific composition is: terminal fixed plate-terminal current collector- Anion exchange membrane-separator net-cation exchange membrane-inline collector-cation exchange membrane-separator net-anion exchange membrane-terminal current collector-terminal fixed plate. The influent in unit 1 is K ₂ SO ₄ solution with a concentration of 100 mM, and the influent in unit 2 is simulated urban sewage, in which the concentration of NH ₄ Cl is 100 mM, the concentration of CaCl ₂ is 50 mM, and the concentration of MgCl ₂ is 50 mM; The volume of the wastewater to be treated in each unit is 600mL, the electrode solution is 5wt% commercial capacitive activated carbon suspension, the volume is 150mL, the working voltage in each unit is 1.2V, and the flow rate of the electrode solution and the inlet water are both 5.00 mL/min to investigate the adsorption of the reactor on two different electrolyte solutions.

It can be seen from the processing results in Fig. 9 that the electrical conductivity in the two units decreases continuously with the progress of the reaction process, and there is no significant difference between the two units, which can achieve the effect of desalination, indicating that the expansion of the reactor scale will not Affecting the treatment effect of the reactor, on the basis of ensuring the desalination process, achieves the effect of improving the treatment capacity of the reactor.

To sum up, the application and implementation of the present invention is simple, and the processing capacity of the reactor can be improved through the use of the in-line current collector on the basis of the existing reactor, and the adjacent units share a current collector, which significantly reduces the number of reactors. The construction cost provides a feasible idea for the scale expansion of the FCDI reactor.

Claims (10)

1. An integrated stacked flow electrode capacitive deionization device, characterized in that it comprises a left terminal fixing plate (11) and a right terminal fixing plate (12) that are parallel and opposite, and the left terminal fixing plate (11) The left terminal collector (21) is arranged on the right side of the right side of the terminal fixing plate (12), the right terminal collector (22) is arranged on the left side of the right terminal fixing plate (12), and the right side of the left terminal collector (21) 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 arranged in close contact with the left side of the surface and the left side of the right terminal current collector (22). An annular silicone gasket (5) is arranged between the exchange membrane (41) and the anion exchange membrane (42), and the thickness of the silicone gasket (5) is used to form a water inlet chamber in the annular space. A water inlet and a water outlet are set on the flow device and each ion exchange membrane, and the silicone tube is inserted into the water inlet chamber to form a water inlet and outlet circuit respectively. 2 . The integrated stacked flow electrode capacitive deionization device according to claim 1 , wherein a plurality of embedded inlays are evenly spaced between the left terminal current collector ( 21 ) and the right terminal fixing plate ( 12 ). 3 . Type current collectors (3), each adjacent current collector has a space interval, and both sides of each in-line type current collector (3) are closely arranged 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 arranged opposite 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 each current collector is etched with a rotary electrode liquid flow channel on the side of each current collector that is close to the ion exchange membrane, and each terminal is fixed The plate and each current collector are provided with an electrode liquid inflow inlet and an electrode liquid outflow outlet, and are penetrated into a silicone tube to form an in and out electrode liquid circuit with each electrode liquid flow channel respectively. 4 . The integrated stacked flow electrode capacitive deionization device according to claim 3 , wherein the water inlet and the water outlet are located at two diagonal corners of each terminal fixing plate, each current collector and each ion exchange membrane. 5 . , the electrode liquid flow inlet and the electrode liquid flow outlet are located at the other two diagonal corners of each terminal fixing plate and each current collector. 5 . The integrated stacked flow electrode capacitive deionization device according to claim 3 , wherein the rotary electrode liquid flow channel adopts a semicircular connection channel at the rotary position. 6 . 6 . The integrated stacked flow electrode capacitive deionization device according to claim 5 , wherein, in the water inlet and outlet circuits, the direction of water flow in the water inlet chamber is upward flow, and in the electrode liquid circuit, in the electrode liquid circuit The flow direction of the electrode liquid in the liquid flow channel is upward flow. 7. The integrated stacked flow electrode capacitive deionization device according to claim 1, wherein the annular space of the silicone gasket (5) is provided with a partition (6) parallel to the ion exchange membrane, and the partition The outer edge of (6) is connected to the inner edge of the silicone gasket (5). 8 . The integrated stacked flow electrode capacitive deionization device according to claim 7 , wherein the area of the separator ( 6 ) is greater than or equal to the effective contact area between the ion exchange membrane and the electrode chamber. 9 . 9. The integrated stacked flow electrode capacitive deionization device according to claim 1 or 7 or 8, wherein the outer contour of the silicone gasket (5) is connected to a cation exchange membrane (41) and an anion exchange membrane (42). ) is consistent with 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 device according to claim 1 or 7 or 8, wherein each terminal fixing plate, each current collector, each ion exchange membrane and each silica gel gasket (5 )fixed.

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