CN109012203B - Bipolar membrane electrodialysis device - Google Patents
Bipolar membrane electrodialysis device Download PDFInfo
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- CN109012203B CN109012203B CN201811212539.8A CN201811212539A CN109012203B CN 109012203 B CN109012203 B CN 109012203B CN 201811212539 A CN201811212539 A CN 201811212539A CN 109012203 B CN109012203 B CN 109012203B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/46—Apparatus therefor
- B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
- B01D61/485—Specific features relating to the ion-exchange material
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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
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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Abstract
The invention relates to a bipolar membrane electrodialysis device, which comprises a plurality of membranes and a dialysis chamber, wherein the membranes comprise at least two bipolar membranes, at least one positive membrane and at least one negative membrane, so that at least three compartments consisting of at least one alkali compartment, at least one salt compartment and at least one acid compartment are formed in the dialysis chamber; wherein the periphery of each membrane is respectively tightly connected with the inner wall of the dialysis chamber through corresponding flexible connecting parts in a mode of allowing the corresponding membrane to move under the action of pressure difference of adjacent compartments so as to change the volume of the adjacent compartments. The diaphragm is movably connected to the dialysis chamber through the flexible connecting part, so that the corresponding diaphragm is allowed to move under the action of the pressure difference of the adjacent compartments to further change the volume of the adjacent compartments, the pressure difference of the adjacent compartments is rapidly reduced through the movement of the diaphragm when the flow rate fluctuates, the leakage caused by the pressure difference is reduced, the liquid inlet flow rate or the liquid outlet flow rate does not need to be adjusted frequently, and the device is economical and efficient.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a bipolar membrane electrodialysis device.
Background
The bipolar membrane is a layered membrane with one surface being a cation exchange layer and the other surface being an anion exchange layer, the junction of the cation exchange layer and the anion exchange layer is a water layer, and under the action of an external direct current electric field, the water in the water layer is cracked into H+And OH-And passed through the cation exchange layer and the anion exchange layer, respectively. Double layerMembranes are a key component of bipolar membrane electrodialysis (BPED). BPED is an electrodialysis device that converts salts into acids and bases using bipolar membrane dissociation of water and selective permeability of anion and cation exchange membranes.
Under the action of DC electric field, ions in the solution are directionally transferred, cations in the salt chamber permeate through the positive membrane and are blocked by the negative layer of the bipolar membrane to be left in the alkaline chamber, and meanwhile the bipolar membrane dissociates OH generated by water-After penetrating through the negative layer of the bipolar membrane, the bipolar membrane is blocked by the positive membrane and is left in the alkali chamber, so that alkali is generated; the anions in the salt chamber permeate the cathode membrane and are blocked by the anode layer of the bipolar membrane to remain in the acid chamber, and the bipolar membrane dissociates the H generated by water+After penetrating through the anode layer of the bipolar membrane, the acid is blocked by the cathode membrane and is left in the acid chamber, so that acid is generated; because the ions of the salt chamber solution are all outwards transferred, the desalination effect is achieved along with time.
The research report about the bipolar membrane appears from the middle of the 50 s of the 20 th century, and the development process can be divided into three stages: the first stage is from the middle of the 50 th of the 20 th century to the initial stage of the 80 th of the 20 th century, which is a very slow development period of the bipolar membrane, the bipolar membrane is directly pressed by two pieces of cation and anion exchange membranes, the performance is very poor, the water decomposition voltage is dozens of times higher than the theoretical voltage drop, and the application research is still in a laboratory stage based on water dissociation; in the second stage, from the beginning of the 80 s to the beginning of the 90 s of the 20 th century, due to the improvement of the bipolar membrane preparation technology, the monolithic bipolar membrane is successfully developed, the performance of the monolithic bipolar membrane is greatly improved, the monolithic bipolar membrane is successfully applied to acid and alkali preparation and desulfurization technologies, and the commercial bipolar membrane appears in the stage. The bipolar membrane is a period of rapid development from the beginning of 90 s in the 20 th century to the present, and with the deep research on the working process mechanism of the bipolar membrane, the membrane structure, the membrane material and the preparation process are greatly improved, so that the performance of the bipolar membrane is greatly improved, wherein the improvement on the contact interface of a negative membrane and a positive membrane is mainly realized, and the membrane voltage is greatly reduced by a 'single-piece type' structure from an initial simple 'laminated' or 'coated' structure to a 'single-piece type' structure appearing in the beginning of 80 s in the 20 th century and then a complex structure with an intermediate 'catalytic layer'. The bipolar membrane electrodialysis technology plays a unique role in optimizing the traditional industrial process and the new industrial process.
Chinese patent publication No. CN2825084Y discloses a concentrated electrodialyzer, which comprises an ion exchange membrane, a separator, and an anode and a cathode plate, wherein a sealing gasket is respectively arranged between the homogeneous ion exchange membrane and the separator, and between the anode and the cathode plates; in addition, electrode liquid and reaction product leading-out circular tubes are embedded in the positive and negative electrode plates to replace square groove milling electrode liquid leading-out channels on the original electrode frames. The utility model discloses a guaranteed never the cluster between dense, the fresh water room and leaked, the discharge of electrode liquid and reaction product is more unobstructed in the electrode chamber simultaneously, and no dead angle ensures production safety. The utility model is particularly suitable for the concentrated extraction of noble and rare metals from solution. However, the cross leakage of the present invention is a technical solution in which the diaphragm is installed in a dialysis cell, and if the diaphragm is installed in the dialysis cell and the joint portion with the dialysis cell is not tightly sealed, the cross leakage is likely to occur. The membrane sheets are stacked to form a membrane stack, which prevents cross leakage, but does not take into account leakage caused by pressure difference between adjacent compartments.
Chinese patent publication No. CN106630040A discloses a selective bipolar membrane electrodialysis system and its application, which includes an electrodialysis membrane stack, and an anode plate and a cathode plate fixed on both sides of the electrodialysis membrane stack by clamping plates; the electrodialysis membrane stack is formed by sequentially and alternately laminating a plurality of functional membranes and then adding a flow passage separation net and a sealing gasket; the functional membrane comprises a bipolar membrane and a multivalent ion selective permeable membrane; the anion exchange layer of the bipolar membrane faces the anode plate, and the cation exchange layer faces the cathode plate. According to the selective bipolar membrane electrodialysis system, bipolar membrane electrodialysis and selective electrodialysis are combined in the same device, and when the system is used for desalting a salt-containing feed liquid and producing acid and alkali, the bipolar membrane electrodialysis and the selective electrodialysis are combined into the same operation, so that the process is simplified, the operation amount is reduced, the energy consumption of electrode reaction is reduced, and the production efficiency is improved. However, the diaphragm of this invention is still fixed and does not address the problem of leakage caused by the pressure difference between adjacent compartments.
In summary, the membranes of the conventional electrodialysis devices are fixed relative to the electrodialysis cells, and in this case, during the water supply process, the pressure difference between the adjacent compartments is inevitably caused by various reasons, and leakage is caused. Leakage is the leakage of the solution in the high pressure side compartment to the low pressure side compartment caused by the pressure difference between the two sides of the membrane, so that some ions are mixed into the compartments which the producer does not want to appear in the leakage process, thereby reducing the efficiency of electrodialysis filtration and also affecting the purity of the final product. One important factor affecting differential pressure variation is pump flow, which is not practically constant, and differential pressure variation may be caused by voltage fluctuation, frequency fluctuation, wear of pumping components, such as impeller wear, and the like. For the pressure difference change caused by the flow fluctuation, the operation of adjusting the water supply amount of the corresponding supply pump or the water discharge amount of the corresponding water outlet after simply monitoring the pressure by the pressure gauge disposed near the water inlet is slow and uneconomical. Furthermore, the pressure difference may also lead to problems with increased risk of membrane deformation, damage and/or water leakage.
However, in the prior art, the leakage is solved by measuring the pressure difference between adjacent compartments by a pressure gauge, and then reducing the pressure difference by adjusting the inlet flow rate or the outlet flow rate of the corresponding compartment after measuring the pressure difference, which is slow and uneconomical as mentioned above, and if the pump is frequently controlled to adjust the pumping flow rate, the pump is easily damaged, so the structure of the electrodialysis device is urgently needed to be improved to solve the leakage from another new angle.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a bipolar membrane electrodialysis device, which is characterized in that a membrane is movably connected to a dialysis chamber through a flexible connecting part, so that the corresponding membrane is allowed to move under the action of the pressure difference of adjacent compartments to change the volume of the adjacent compartments, and further, when the flow fluctuates, the pressure difference of the adjacent compartments is quickly reduced through the movement of the membrane, the leakage caused by the pressure difference is reduced, the liquid inlet flow or the liquid outlet flow does not need to be frequently adjusted, and the bipolar membrane electrodialysis device is economical and efficient.
According to a preferred embodiment, a bipolar membrane electrodialysis device comprises a number of membrane sections comprising at least two bipolar membranes, at least one positive membrane and at least one negative membrane, and a dialysis chamber to form at least three compartments within the dialysis chamber consisting of at least one base compartment, at least one salt compartment and at least one acid compartment; wherein the periphery of each membrane is respectively tightly connected with the inner wall of the dialysis chamber through corresponding flexible connecting parts in a mode of allowing the corresponding membrane to move under the action of the pressure difference of the adjacent compartments so as to change the volume of the adjacent compartments.
According to a preferred embodiment, at least one part of the dialysis chamber is a chamber formed by stacking a plurality of detachable first sealing frames, wherein the adjacent first sealing frames are tightly pressed and connected through fasteners, and a membrane is arranged in each first sealing frame, and each membrane is tightly connected to the inner wall of the first sealing frame through at least one independent flexible connecting part.
According to a preferred embodiment, after the flexible connecting portion is mounted in place on the first sealing frame but before the first sealing frame is not stacked and compressed, two ends of the edge portion of the flexible connecting portion connected with the first sealing frame respectively extend out of the first sealing frame, and after the first sealing frame is stacked and compressed, the portions of the two adjacent edge portions extending out of the first sealing frame abut against each other and are compressed to realize tight joint.
According to a preferred embodiment, before the first sealing frames are not stacked and compressed, the parts of the edge parts extending out of the first sealing frames are inclined towards the inside of the first sealing frames, so that in the process of stacking and compressing two adjacent first sealing frames, the parts of the adjacent edge parts extending out of the first sealing frames abut against each other and then protrude towards the inside of the first sealing frames to realize tight joint, and after tight joint, a wedge-shaped sealing cross section protruding towards the inside of the first sealing frames is formed at the joint of the two adjacent edge parts.
According to a preferred embodiment, the flexible connection portion includes at least a first section and a second section, each having a different elastic modulus and being in close contact with each other, the first elastic modulus of the first section being greater than the elastic modulus of the second section, the first section being used for connecting the first seal frame, a part of the second section being in close contact with the first section, and the other part of the second section being in close contact with the corresponding diaphragm.
According to a preferred embodiment, the bipolar membrane electrodialysis device further comprises a plurality of limiting parts, and the corresponding limiting parts are used for limiting the limiting positions of the corresponding membrane moving to the two compartments adjacent to the membrane.
According to a preferred embodiment, the limiting part is a limiting rotating shaft and a plurality of first limiting columns and a plurality of second limiting columns which are arranged on two sides of the diaphragm; the water inlet of each compartment is arranged on the first side of the electrodialysis device in a mode that the overall flow direction of water flow in each compartment is the same, and the side where the water outlet of each compartment is located is the second side of the electrodialysis device; the limiting rotating shafts are arranged at one ends, close to the second sides, of the corresponding diaphragms, and the first limiting columns and the second limiting columns are distributed at limiting positions, which are used for limiting the diaphragms to rotate towards two compartments adjacent to the diaphragms, on two sides of the corresponding diaphragms; after the diaphragm pivotally moves to the limit position around the limit rotating shaft, the diaphragm abuts against the first limit column or the second limit column to block the diaphragm from further rotating in at least one direction.
According to a preferred embodiment, when the diaphragm abuts against the first limit post, the first travel switch is triggered; after a controller of the bipolar membrane electrodialysis device detects that a first travel switch is triggered, the pressure difference between two compartments is reduced by at least one control mode of increasing the liquid inlet flow of a compartment where the first travel switch is located, reducing the liquid outlet flow of the compartment where the first travel switch is located, reducing the liquid inlet flow of a compartment where a second travel switch is located and increasing the liquid outlet flow of the compartment where the second travel switch is located until a diaphragm is separated from the first limiting column to abut against the first limiting column; and/or when the diaphragm abuts against the second limiting column, the second travel switch can be triggered; after a controller of the bipolar membrane electrodialysis device detects that a second travel switch is triggered, the pressure difference between the two compartments is reduced by at least one control mode of reducing the liquid inlet flow of the compartment where the first travel switch is located, increasing the liquid outlet flow of the compartment where the first travel switch is located, increasing the liquid inlet flow of the compartment where the second travel switch is located and reducing the liquid outlet flow of the compartment where the second travel switch is located until the diaphragm is separated from the second limiting column to abut against the second limiting column.
According to a preferred embodiment, the first travel switch is mounted on the diaphragm, on the end of the first limit post or directly as the first limit post; and/or the second travel switch is arranged on the diaphragm, the end part of the second limit column or directly used as the second limit column.
According to a preferred embodiment, after detecting the triggered state of the first travel switch, the controller of the bipolar membrane electrodialysis device times the triggered state of the first travel switch, and only when the first time length of the triggered state of the first travel switch exceeds a first preset threshold value, the controller reduces the pressure difference between the two compartments by at least one of increasing the liquid inlet flow rate of the compartment in which the first travel switch is located, reducing the liquid outlet flow rate of the compartment in which the first travel switch is located, reducing the liquid inlet flow rate of the compartment in which the second travel switch is located, and increasing the liquid outlet flow rate of the compartment in which the second travel switch is located until the diaphragm is separated from the first limit column; and/or after the controller of the bipolar membrane electrodialysis device detects that the second travel switch is triggered, timing the triggered state of the second travel switch, and only when the second time length for which the second travel switch is triggered exceeds a second preset threshold value, reducing the pressure difference of the two compartments until the diaphragm is separated from the second limit column to abut against the second limit column by at least one control mode of reducing the liquid inlet flow of the compartment in which the first travel switch is located, increasing the liquid outlet flow of the compartment in which the first travel switch is located, increasing the liquid inlet flow of the compartment in which the second travel switch is located, and reducing the liquid outlet flow of the compartment in which the second travel switch is located.
Drawings
FIG. 1 is a simplified schematic diagram of a preferred embodiment of the present invention;
FIG. 2 is a simplified schematic diagram of a preferred embodiment of the present invention employing a dialysis chamber formed by upper and lower two-part housings;
FIG. 3 is a simplified schematic structural view of a preferred embodiment of a dialysis chamber of the present invention constructed using a stack of a first sealing frame and a second sealing frame;
FIG. 4 is a schematic view of the structure in which the diaphragm is mounted on the first sealing frame;
FIG. 5 is an exploded schematic view of the structure shown in FIG. 4;
FIG. 6 is a simplified cross-sectional view of the structure shown in FIG. 4;
fig. 7 is a simplified cross-sectional view of two first sealing frames in a stacked and compressed state;
FIG. 8 is a simplified schematic of a preferred embodiment of the present invention;
FIG. 9 is a schematic view of a modular connection of a portion of the electrical components of the present invention;
FIG. 10 is a simplified schematic illustration of the base chamber of a preferred embodiment of the present invention; and
fig. 11 is a block diagram of a preferred embodiment of the present invention.
List of reference numerals
100: the diaphragm 110: bipolar membrane 120: sun film
130: a negative film 200: dialysis chamber 200A: upper shell
200B: lower case 200C: first seal frame 200D: second sealing frame
210: the alkali chamber 220: salt chamber 230: acid chamber
240: positive electrode chamber 250: negative electrode chamber 300: flexible joint
310: first section 320: second section 300A: edge part
410: first stopper column 420: the second stopper column 430: limiting rotating shaft
510: first travel switch 520: second stroke switch 600: controller
700: ion exchange resin 800: water A: wedge-shaped sealing cross section
Detailed Description
The following detailed description is made with reference to fig. 1, 2, 3, 4, 5, 6, 7, 8 and 9.
In the description of the present invention, it is to be understood that, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are used for indicating the orientation or positional relationship indicated based on the drawings, they are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is also to be understood that the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, the term "plurality", if any, means two or more unless specifically limited otherwise.
In the description of the present invention, it should be further understood that the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, and for example, the terms "mounting," "connecting," "fixing," and the like may be fixed, detachable, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To one of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood as appropriate, unless explicitly stated and/or limited otherwise.
In the description of the present invention, it should also be understood that "over" or "under" a first feature may include the first and second features being in direct contact, and may also include the first and second features being in contact not directly but through another feature therebetween, unless expressly stated or limited otherwise. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
This example discloses a bipolar membrane electrodialysis device, which can be supplemented in whole and/or in part by preferred embodiments of other examples without causing conflicts or inconsistencies.
According to a preferred embodiment, referring to fig. 1, a bipolar membrane electrodialysis device, which may comprise a number of membrane sheets 100 and a dialysis chamber 200. The number of membranes 100 may comprise at least two bipolar membranes 110, at least one positive membrane 120 and at least one negative membrane 130 to form at least three compartments consisting of at least one base compartment 210, at least one salt compartment 220 and at least one acid compartment 230 within the dialysis chamber 200. The periphery of each membrane 100 may be attached to the inner wall of the dialysis chamber 200 by corresponding flexible connections 300 in a manner that allows the corresponding membrane 100 to move and thereby change the volume of the adjacent compartment under the effect of the pressure difference between the adjacent compartments. Preferably, the periphery of each membrane 100 can be respectively connected with the inner wall of the dialysis chamber 200 through the corresponding flexible connection part 300 in a manner that the corresponding membrane 100 can be allowed to move under the action of the pressure difference of the adjacent compartments so as to change the volume of the adjacent compartments, and the other alternative expression is that the periphery of each membrane 100 is respectively connected with the inner wall of the dialysis chamber 200 through the corresponding flexible connection part 300, and the flexible connection part 300 is arranged in a manner that the corresponding membrane 100 can be allowed to move under the action of the pressure difference of the adjacent compartments so as to change the volume of the adjacent compartments. Through the mode, the pressure difference change caused by short-time fluctuation of the flow can be relieved in a certain range in a self-adaptive mode through the change of the volume, the response is rapid, the flow of the pump does not need to be regulated frequently, and the pump is economical and efficient. Preferably, in the present invention, for brevity, the membrane 100 may refer to at least one of the bipolar membrane 110, the male membrane 120 and the female membrane 130. Preferably, in the case of two bipolar membranes 110, one positive membrane 120 and one negative membrane 130, the bipolar membranes 110, the positive membrane 120, the negative membrane 130 and the bipolar membranes 110 may be arranged in this order. The positive membrane 120, the negative membrane 130, and the bipolar membrane 110 may be arranged as a repeating unit to constitute a membrane stack to improve efficiency. That is, the bipolar membranes 110, 120, 130, 110, 120, 130, 110 … … may be arranged in this order. The material of the flexible connecting portion may be at least one of nitrile rubber, butyl rubber, hydrogenated nitrile rubber, ethylene propylene rubber, fluorine rubber, urethane rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, and chlorinated polyethylene rubber, for example. After some wastewater is treated by a clarification tank and other equipment, the temperature of the wastewater entering the bipolar membrane electrodialysis device can be relatively high, and the flexible connecting part can be damaged when the wastewater is introduced into the bipolar membrane electrodialysis device in an uncooled state. Thus, in this case, it may be cooled to a temperature in a range, for example below +40 ℃, before being passed into the bipolar membrane electrodialysis unit. But cooling is not necessary, for example, when the flexible connecting part is made of fluororubber, cooling is not needed, because the use temperature range of the fluororubber is-20 ℃ to +200 ℃.
According to a preferred embodiment, a bipolar membrane electrodialysis device can comprise a plurality of membrane sheets 100 and a dialysis chamber 200. The plurality of membranes 100 may include at least two bipolar membranes 110, at least one positive membrane 120, and at least one negative membrane 130. At least two bipolar membranes 110, at least one positive membrane 120, and at least one negative membrane 130 can be disposed within dialysis chamber 200 to form at least one base chamber 210, at least one salt chamber 220, and at least one acid chamber 230. The periphery of each bipolar membrane 110, each positive membrane 120 and each negative membrane 130 can be respectively closely connected with the inner wall of the dialysis chamber 200 through corresponding flexible connecting parts 300 in a manner that the positions can be adjusted according to the pressure difference of adjacent compartments. Preferably, the compartment may refer to at least one of the base chamber 210, the salt chamber 220, and the acid chamber 230.The compartment may also refer to at least one of the positive electrode compartment 240 and the negative electrode compartment 250, and the arrangement position and arrangement manner of the positive electrode compartment 240 and the negative electrode compartment 250 are well known in the art and will not be described herein. The principle of acid and alkali production by the bipolar membrane electrodialysis device is described below by way of example in fig. 1. The membrane-anchoring groups of the positive membrane 120 itself carry negatively charged ions, and thus repel negatively charged anions and selectively pass cations. The membrane-anchoring groups of the negative membrane 130 itself carry positively charged ions and thus repel positively charged cations from passing through and selectively pass through anions. The salt solution containing salt MX enters from the water inlet of the salt chamber 220, under the action of the electric field, cations in the salt chamber 220 migrate to the cathode direction, and the cations M+OH ionized with bipolar membrane 110 by entering alkaline chamber 210 through positive membrane 120-The binding produces the base MOH. While the anions in the salt chamber 220 migrate towards the anode, and the anions X-H which enters the alkali chamber 210 through the cathode membrane 130 and is ionized with the bipolar membrane 110+Binding to form an acid. In this way, the salt in the salt compartment 220 is removed and converted into the corresponding acid HX and base MOH. Preferably, the positive membrane 120 may also be referred to as a cation exchange membrane. The cathode membrane 130 may also be referred to as an anion exchange membrane. The water inlet of the base chamber 210 and/or the water inlet of the acid chamber 230 may feed water 800.
According to a preferred embodiment, the dialysis chamber 200 can be a sealed chamber formed by assembling at least two parts of shells, and the membrane 100 is tightly fitted in the dialysis chamber 200 by at least one of bonding, bolting, clamping and fastening. Each membrane 100 may be sealed to the interior of the at least two-part housing assembled dialysis chamber 200 by at least one separate flexible connection 300. For example, an upper case 200A and a lower case 200B are shown in fig. 2. The lower shell 200B may be a hollow cavity with an open upper end, and the inside of the lower shell is provided with a mounting groove for mounting the membrane 100, and after the lower shell is mounted in place, the seam can be coated with sealant. For easy maintenance, the upper portion of the flexible connection portion 300 may protrude out of the hollow cavity, and the upper housing 200A is sealed by compressing the flexible connection portion 300 after being seated on the lower housing 200B.
According to a preferred embodiment, with reference to fig. 3, 4 and 5, at least a part of the dialysis chamber 200 can be a chamber formed by stacking a plurality of removable first sealing frames 200C and press-fitting adjacent first sealing frames 200C with a fastener. At least one membrane sheet 100 may be disposed within each first sealing frame 200C. Each membrane 100 may be closely attached to the inner wall of the first sealing frame 200C by at least one independent flexible connection 300, respectively. It will be appreciated by those skilled in the art that both ends of the dialysis chamber 200 are provided with second sealing frames 200D having only one end opened for closing both ends of the dialysis chamber 200. The first sealing frame 200C and the second sealing frame 200D are closely attached to constitute the positive electrode chamber 240 and/or the negative electrode chamber 250.
According to a preferred embodiment, referring to fig. 6, the width of the edge portion 300A of the flexible connection portion 300 connected to the first sealing frame 200C may be greater than the width of the remaining portion of the flexible connection portion 300. Preferably, after the flexible connecting portion 300 is mounted in place on the first sealing frame 200C but before the first sealing frame 200C is not stacked and compressed, both ends of the edge portion 300A may respectively protrude out of the first sealing frame 200C. After the first sealing frames 200C are stacked and compressed, the portions of the two adjacent edge portions 300A extending beyond the first sealing frames 200C may abut against each other and be compressed to be closely fitted. This preferred embodiment has at least three advantageous technical effects. First, when the flexible connection portion 300 is mounted, the mounting speed is increased and process errors are reduced by using the portions protruding from both ends as a positioning reference. Particularly, when the flexible connection portion 300 is seated in the first sealing frame 200C from the outside of the first sealing frame 200C, it can help an installer to reduce a large amount of adjustment time; secondly, when one flexible connecting part 300 arranged inside deforms due to pressure difference, partial acting force borne by the flexible connecting part can be transmitted to the adjacent flexible connecting part 300, so that the pressure borne by the connecting part can be dispersed, the using amount of connecting parts such as sealant, bolts or rivets can be reduced, and the leakage problem of adjacent compartments caused by loosening or falling of the connecting parts can be reduced; thirdly, the existing membrane stack formed by a stacking mode is often accompanied by the problem of outward water leakage due to poor sealing, and through the mode, one-time sealing and leakage prevention are skillfully added inside the membrane stack. Preferably, the portion of the edge portion 300A extending beyond the first seal frame 200C is provided with a positioning reference line at least on a surface facing the first seal frame 200C, and the color of the positioning reference line is different from any color of the first seal frame 200C and any color of other portions of the flexible connecting member except the positioning reference line. For example, if the first sealing frame 200C has two colors of silver and black and the flexible connecting member has one color of milky white, the positioning reference line may be set to red, yellow, purple, or green.
According to a preferred embodiment, referring to fig. 6 and 7, before the first sealing frame 200C is not stacked and compressed, the portion of the edge portion 300A extending beyond the first sealing frame 200C may be inclined toward the inside of the frame of the first sealing frame 200C, so that during the stacking and compressing process of two adjacent first sealing frames 200C, the portion of the adjacent edge portion 300A extending beyond the first sealing frame 200C abuts against each other and then protrudes toward the inside of the first sealing frame 200C to be sealed, and after the sealing, a wedge-shaped sealing cross section a protruding toward the inside of the first sealing frame 200C is formed at the joint of the two adjacent edge portions 300A. Preferably, the portion of the edge portion 300A protruding beyond the first sealing frame 200C is provided such that the thickness of the free end is smaller as it gets closer to both ends of the edge portion 300A. Thus, at the junction of two adjacent edge regions 300A, a wedge-shaped sealing cross section a is formed which projects inwardly of the first sealing frame 200C. Through this mode, can realize two beneficial technological effects at least: firstly, under the condition that the compartment is filled with liquid, two sides of the wedge-shaped sealing cross section A are hydraulically pressed, and under the condition that the internal hydraulic pressure is higher, the two sides are pressed by each other more, the combination is tighter, and the water in the compartment is less prone to leaking out from a gap between the two sides; secondly, the parts of the edge part 300A extending out of the first sealing frame 200C abut against each other and are not extruded into the gap between the two first sealing frames 200C because of protruding out of the first sealing frame 200C, so that the problem that the first sealing frames 200C are not tightly adhered is avoided; thirdly, after the wedge-shaped sealing cross section a is formed, the two edge portions 300A forming the wedge-shaped sealing cross section a exert a force on each other, which is directed to the first sealing frame 200C, so that the possibility that the edge portions 300A are peeled from the first sealing frame 200C can be reduced, and the peeling prevention effect can be achieved.
Preferably, the first sealing frame 200C and the edge portion 300A are provided with a water passage. For example, the first sealing frames 200C and the edge portion 300A may be provided with semicircular notches to form a water passage by joining the two first sealing frames 200C after they are closely attached. Alternatively, the first seal frame 200C and the edge portion 300A may be provided with water passages corresponding to each other, that is, water passages of a non-joined integrated type. The cross-sectional area of the water passage in the frame of the first sealing frame 200C is larger than the cross-sectional area of the water passage in the edge portion 300A, so that the edge portion 300A tightly embraces the water passage when the water passage is installed, thereby reducing the possibility of water leakage. Moreover, the water passage is inserted and installed into the edge portion 300A from the outside to the inside of the first sealing frame 200C, so that the flexible portion of the water passage of the edge portion 300A is protruded toward the inside of the first sealing frame 200C, thereby achieving a better sealing effect. It is also conceivable that other prior arts for installing the water inlet and/or the water outlet on the first sealing frame 200C may be applied to the present invention, and the detailed description thereof is omitted.
According to a preferred embodiment, referring again to fig. 4, 5 and 6, the flexible connection 300 may include a first section 310 and a second section 320, each having a different modulus of elasticity, and being in close contact with each other. The first elastic modulus of the first section 310 may be greater than the elastic modulus of the second section 320. The first section 310 may be used to connect the first sealing frame 200C. A portion of the second section 320 may be in close contact with the first section 310. Another portion of the second section 320 may be fitted to the corresponding membrane sheet 100. First, the first section 310 has a larger elastic modulus, so that it has a stronger resistance to deformation, and is more suitable as a connection point with the first sealing frame 200C, and after the first section is connected to the first sealing frame 200C by bonding, riveting or bolting, the deformation amount is smaller than that of the second section 320, so that the impact on the connection point is smaller, the possibility of loosening of the connection point is reduced, and the service life of the connection point is prolonged; second, the second section 320 can respond more quickly to pressure differential changes with a smaller modulus of elasticity; third, the pressure difference caused by the smaller elastic modulus is less changed under the same deformation amount, and specifically, when the liquid on the high pressure side pushes the diaphragm 100 to move for a certain distance, the flexible connection portion 300 generates a restoring force for returning the diaphragm 100 to the original position, and the restoring force acts on the liquid on the high pressure side to generate a certain pressure difference between the high pressure side and the low pressure side, so that the pressure difference caused by the smaller elastic modulus of the second section 320 is less changed under the same deformation amount, and the leakage caused by the pressure difference is less likely to be caused.
According to a preferred embodiment, referring to fig. 8, the bipolar membrane electrodialysis device may further comprise a plurality of position-limiting parts. The respective limiting portion may be used to limit the extreme position of the respective membrane 100 to the movement towards the two compartments adjacent to the membrane 100. For example, the position-limiting part may be a position-limiting rotation shaft 430, and a plurality of first position-limiting columns 410 and a plurality of second position-limiting columns 420 disposed on both sides of the diaphragm 100. The water inlet of each compartment is arranged on the first side of the electrodialysis unit in such a way that the overall flow direction of the water flow in each compartment is the same. The side of each compartment at which the water outlet is located may be the second side of the electrodialysis device. The limiting rotation shaft 430 may be disposed at an end of the corresponding diaphragm 100 near the second side, the first limiting column 410 and the second limiting column 420 are distributed at both sides of the corresponding diaphragm 100 for limiting a limit position of the diaphragm 100 to rotate to two compartments adjacent to the diaphragm 100, and after the diaphragm 100 is pivotally moved to the limit position around the limiting rotation shaft 430, the diaphragm 100 abuts against the first limiting column 410 or the second limiting column 420 to block the diaphragm 100 from further rotating in at least one direction. However, the limiting portion is not necessarily provided with the limiting rotation shaft 430, and the diaphragms 100 may be connected only by the flexible connection portion 300, for example, the limiting portion is a plurality of third limiting columns and a plurality of fourth limiting columns which are arranged on the first sealing frame 200C, the third limiting columns and the fourth limiting columns are distributed on two sides of the corresponding diaphragm 100 for limiting a limit position of the diaphragm 100 moving to two compartments adjacent to the diaphragm 100, and after the diaphragm 100 moves to the limit position, the diaphragm 100 abuts against the third limiting columns or the fourth limiting columns to block the diaphragm 100 from further moving in at least one direction. The number of the third limiting columns can be at least four, and the third limiting columns are located on one side, close to the cathode, of the corresponding membrane 100 and distributed and arranged to abut against four corners of the membrane 100. For another example, the limiting part is a limiting rope and/or a limiting chain distributed on two sides of the membrane 100, one end of the limiting rope and/or the limiting chain is connected to the first sealing frame 200C, the other end of the limiting rope and/or the limiting chain is connected to the membrane 100 for limiting a limiting position of the membrane 100 moving to two compartments adjacent to the membrane 100, and after the membrane 100 moves to the limiting position, the limiting rope and/or the limiting chain is straightened to block the membrane 100 from further moving in at least one direction. The limiting ropes and/or limiting chains can be at least four and are distributed at four corners of the membrane 100.
According to a preferred embodiment, referring to fig. 8 and 9, the first travel switch 510 may be triggered when the diaphragm 100 abuts the first restraint post 410. After the controller 600 of the bipolar membrane electrodialysis device detects that the first travel switch 510 is triggered, the pressure difference between the two compartments can be reduced by at least one control mode of increasing the liquid inlet flow rate of the compartment in which the first travel switch 510 is located, decreasing the liquid outlet flow rate of the compartment in which the first travel switch 510 is located, decreasing the liquid inlet flow rate of the compartment in which the second travel switch 520 is located, and increasing the liquid outlet flow rate of the compartment in which the second travel switch 520 is located until the membrane 100 is separated from the first limiting column 410. Preferably, the second travel switch 520 may be triggered when the diaphragm 100 abuts against the second limit post 420. After the controller 600 of the bipolar membrane electrodialysis device detects that the second travel switch 520 is triggered, the pressure difference between the two compartments can be reduced by at least one control mode of reducing the liquid inlet flow of the compartment in which the first travel switch 510 is located, increasing the liquid outlet flow of the compartment in which the first travel switch 510 is located, increasing the liquid inlet flow of the compartment in which the second travel switch 520 is located, and reducing the liquid outlet flow of the compartment in which the second travel switch 520 is located until the membrane 100 is separated from the second limiting column 420. Preferably, the first travel switch 510 may be mounted on the diaphragm 100, on the end of the first restraint post 410, or directly as the first restraint post 410. The second travel switch 520 may be mounted on the diaphragm 100, on the end of the second restraint post 420, or directly as the second restraint post 420. By reducing the pressure differential until the corresponding diaphragm 100 disengages from the first or second restraint post 420, the pressure differential can be balanced by conventional control means without being able to achieve a balanced pressure differential by movement of the corresponding diaphragm 100.
According to a preferred embodiment, after the controller 600 of the bipolar membrane electrodialysis device detects the triggered state of the first stroke switch 510, the triggered state of the first stroke switch 510 can be timed, and only when the first time period when the first stroke switch 510 is triggered exceeds a first preset threshold value, the pressure difference between the two compartments is reduced by at least one of increasing the inlet flow rate of the compartment in which the first stroke switch 510 is located, decreasing the outlet flow rate of the compartment in which the first stroke switch 510 is located, decreasing the inlet flow rate of the compartment in which the second stroke switch 520 is located, and increasing the outlet flow rate of the compartment in which the second stroke switch 520 is located until the membrane 100 is separated from the first limiting column 410. Preferably, after the controller 600 of the bipolar membrane electrodialysis device detects the triggered state of the second stroke switch 520, the triggered state of the second stroke switch 520 may be timed, and only when a second time period during which the second stroke switch 520 is triggered exceeds a second preset threshold, the pressure difference between the two compartments is reduced by at least one of reducing the inlet flow rate of the compartment in which the first stroke switch 510 is located, increasing the outlet flow rate of the compartment in which the first stroke switch 510 is located, increasing the inlet flow rate of the compartment in which the second stroke switch 520 is located, and reducing the outlet flow rate of the compartment in which the second stroke switch 520 is located until the membrane 100 is separated from the second limit column 420.
According to a preferred embodiment, referring to fig. 10, a plurality of ion exchange resins 700 may be disposed within base chamber 210. Ion exchange resin 700 may be provided in a spherical shape and the moving position of ion exchange resin 700 is limited only by the inner wall of base chamber 210. Preferably, the ion exchange resin 700 has a diameter of 0.3mm to 2 mm. Ion exchange resin 700 includes a cation exchange resin and an anion exchange resin. In the case where water is passed through the inside of the alkali chamber 210, the ion exchange resins 700 scrape the inner wall of the alkali chamber 210 under the influence of the water flow to remove at least part of the dirt on the inner wall of the alkali chamber 210. When the volume of the alkali chamber 210 changes from large to small due to the change of the pressure difference in the alkali chamber 210, the corresponding membrane 100 is driven by the flexible connection portion 300 to return to the original position and press at least a part of the ion exchange resin 700 to scrape the inner wall of the alkali chamber 210 so as to remove at least a part of dirt on the inner wall of the alkali chamber 210. The ion exchange resin 700 is arranged in the alkali chamber 210, so that the resistance of the alkali chamber 210 can be further reduced, the alkali making process is more economical, and the inner wall of the alkali chamber 210 can be scraped by two modes of water flow impact and the spherical ion exchange resin 700 extruded by the movement of the diaphragm 100, so that a good descaling effect is achieved. Preferably, the plurality of ion exchange resins 700 have at least two specifications of a first diameter and a second diameter, and are configured to be staggered with respect to each other in the base chamber 210 to form less resistance when the membrane 100 is restored to its original position. Preferably, the first diameter is 0.3 to 0.6mm and the second diameter is 0.9 to 1.2 mm. Particularly preferably, the first diameter is 0.5mm and the second diameter is 0.8 mm. Preferably, the ratio of the filling height of the plurality of ion exchange resins 700 in the base chamber 210 to the height of the base chamber ranges from 1: 2-9: and 10, the height of the alkali chamber is the distance from the lowest horizontal point to the highest horizontal point of the alkali chamber after the bipolar membrane electrodialysis device is installed in place.
Example 2
This embodiment may be a further improvement and/or a supplement to embodiment 1, and repeated contents are not described again. The preferred embodiments of the present invention are described in whole and/or in part in the context of other embodiments, which can supplement the present embodiment, without resulting in conflict or inconsistency.
According to a preferred embodiment, referring to fig. 11, a multi-stage zero-emission treatment apparatus for high-salt wastewater is disclosed, which may include at least one of a wastewater tank 810, a clarifier 200, a clarified liquid storage tank 820, a softening tank 910, an ultrafiltration device 920, a weak acid cation bed 930, a medium-pressure membrane concentration device 941, a high-pressure membrane concentration device 942, a nanofiltration device 950, a first electrically-driven membrane device 961, a second electrically-driven membrane device 962, a freezing crystallizer 971, a nitre crystallizer 972, a sodium chloride crystallizer 973, a bipolar membrane electrodialysis device 980, a wastewater lift pump 11, a first clean water pump 12, and a second clean water pump 13.
Preferably, the multistage zero-emission treatment equipment for the high-salinity wastewater can comprise:
a wastewater tank 810 that may be used to store high salinity wastewater to be treated;
a clarifier 200, which may be connected downstream of the wastewater tank 810, which may be used to pretreat the high salinity wastewater to remove impurity particles, which may be captured by the wastewater lift pump 11 from the wastewater tank 810;
a supernatant storage tank 820, which may be connected downstream of the clarifier 200, may be used to store the supernatant treated by the clarifier 200, and may take the supernatant treated by the clarifier through the first clarified water pump 12;
a softening tank 910 which may be connected downstream of the supernatant storage tank 820, may be used for a primary softening process to reduce the hardness of the liquid, and may take out the supernatant stored in the supernatant storage tank 820 by a second clarified water pump 13;
an ultrafiltration device 920, which may be connected downstream of the softening tank 910, may be used to filter and concentrate the liquid;
a weak acid cation bed 930, which may be connected downstream of the ultrafiltration device 920, may be used for a secondary softening process to further reduce the hardness of the liquid to ensure stable operation of the device downstream thereof;
a medium pressure membrane concentration device 941, which can be connected to the downstream of the weak acid cation bed 930 for concentrating the liquid, and the clear liquid of the medium pressure membrane concentration device 941 can be sent to a water production pipe 840 for collecting fresh water;
a high pressure membrane concentration device 942 which may be connected to a downstream of the medium pressure membrane concentration device 941 for concentrating the concentrated solution of the medium pressure membrane concentration device 941 again, and the clear solution of the high pressure membrane concentration device 942 may be sent to the water production pipe 840;
a nanofiltration device 950, which may be connected downstream of the high pressure membrane concentration device 942, for filtering the concentrated liquid of the high pressure membrane concentration device 942;
a first electrically driven membrane device 961 connected downstream of the nanofiltration device 950 for concentrating the permeate of the nanofiltration device 950, wherein the fresh water of the first electrically driven membrane device 961 can be fed into the water production pipe 840, and the concentrated water of the first electrically driven membrane device 961 can be fed into the salt chamber of the bipolar membrane electrodialysis device 980;
a second electrically driven membrane device 962 which is connected with the downstream of the nanofiltration device 950 and is used for concentrating the trapped liquid of the nanofiltration device 950, wherein the fresh water of the second electrically driven membrane device 962 can be sent to the water production pipe 840, and the concentrated water of the second electrically driven membrane device 962 can be sent to the freezing crystallizer 971;
a freezing crystallizer 971 connected to the downstream of the second electrically driven membrane device 962 and used for freezing and crystallizing the concentrated water of the second electrically driven membrane device 962, wherein the nitre decahydrate mother liquor separated out by the freezing crystallizer 971 is sent to a nitre crystallizer 972, and the clear liquid of the freezing crystallizer 971 is sent to a sodium chloride crystallizer 973;
a nitre crystallizer 972 connected to the downstream of the freezing crystallizer 971 and used for evaporating and concentrating nitre decahydrate mother liquor to obtain sodium sulfate;
a sodium chloride crystallizer 973 connected to the downstream of the freezing crystallizer 971, for evaporating and concentrating the clear liquid of the freezing crystallizer 971 to obtain sodium chloride; and/or
A bipolar membrane electrodialysis device 980 for producing acid and/or base from the salt-containing liquid entering the salt compartment thereof. The weak acid cation bed 930 is a strong ion exchange capacity using a weak acid cation exchange resin. Preferably, a carboxylic acid-based cation resin is used in the weak acid cation bed. The carboxylic acid-based cation resin is weak in dissociation degree in water like organic acid, is weak in acidity, and can be dissociated only in near neutral and alkaline media to show an ion exchange function. The wastewater with high salt content can be subjected to multi-stage treatment of the clarification tank 200, the softening tank 910, the ultrafiltration device 920, the weak acid cation bed 930, the medium-pressure membrane concentration device 941, the high-pressure membrane concentration device 942, the nanofiltration device 950, the first electrically-driven membrane device 961, the second electrically-driven membrane device 962, the freezing crystallizer 971, the nitre crystallizer 972, the sodium chloride crystallizer 973 and/or the bipolar membrane electrodialysis device 980, so that zero emission is realized.
According to a preferred embodiment, the multistage zero-emission treatment equipment for the high-salinity wastewater comprises: the device comprises a clarification tank 200, a softening tank 910 connected to the downstream of the clarification tank 200, an ultrafiltration device 920 connected to the downstream of the softening tank 910, a weak acid anode bed 930 connected to the downstream of the ultrafiltration device 920, a medium-pressure membrane concentration device 941 connected to the downstream of the weak acid anode bed 930, a high-pressure membrane concentration device 942 connected to the downstream of the medium-pressure membrane concentration device 941, a nanofiltration device 950 connected to the downstream of the high-pressure membrane concentration device 942, a first electrically-driven membrane device 961 connected to the downstream of the nanofiltration device 950 and used for concentrating permeate of the nanofiltration device 950, and at least one of a bipolar membrane electrodialysis device 980 connected to the downstream of the first electrically-driven membrane device 961. Bipolar membrane electrodialysis device 980 can be used to treat the concentrated water exiting first electrically driven membrane device 961 to obtain an acid and/or a base. The concentrate water from the first electrically driven membrane device 961 may be fed to the salt compartment of the bipolar membrane electrodialysis device 980.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (8)
1. A bipolar membrane electrodialysis unit, characterized in that it comprises a number of membrane sheets (100) and a dialysis chamber (200), said number of membrane sheets (100) comprising at least two bipolar membranes (110), at least one positive membrane (120) and at least one negative membrane (130), to form at least three compartments within the dialysis chamber (200) consisting of at least one base compartment (210), at least one salt compartment (220) and at least one acid compartment (230);
wherein the periphery of each membrane (100) is respectively in close contact with the inner wall of the dialysis chamber (200) through a corresponding flexible connection part (300) in a manner that the corresponding membrane (100) can be allowed to move under the action of the pressure difference of the adjacent compartments so as to change the volume of the adjacent compartments,
at least one part of the dialysis chamber (200) is a chamber formed by stacking a plurality of detachable first sealing frames (200C) and tightly pressing and connecting the adjacent first sealing frames (200C) through fasteners, a piece of membrane (100) is arranged in each first sealing frame (200C), each piece of membrane (100) is tightly connected to the inner wall of the first sealing frame (200C) through at least one independent flexible connecting part (300),
the flexible connecting part (300) at least comprises a first section (310) and a second section (320) which respectively have different elastic moduli and are tightly connected with each other, the first elastic modulus of the first section (310) is larger than that of the second section (320), the first section (310) is used for connecting a first sealing frame (200C), one part of the second section (320) is tightly connected with the first section (310), and the other part of the second section (320) is tightly connected with a corresponding membrane (100).
2. The bipolar membrane electrodialysis device according to claim 1, wherein, after the flexible connection portion (300) is mounted in place on the first sealing frame (200C) but before the first sealing frame (200C) is not yet stacked and compressed, both ends of the edge portion (300A) of the flexible connection portion (300) connected to the first sealing frame (200C) respectively protrude outside the first sealing frame (200C),
after the first sealing frames (200C) are stacked and pressed, the parts of the two adjacent edge parts (300A) extending out of the first sealing frames (200C) are abutted and compressed to realize tight fit.
3. A bipolar membrane electrodialysis unit according to claim 2, wherein, before said first sealing frame (200C) is stacked and compressed, the portion of said edge portion (300A) extending beyond the first sealing frame (200C) is inclined inward of the frame of the first sealing frame (200C) so that, during stacking and compression of two adjacent first sealing frames (200C), the portion of the adjacent edge portion (300A) extending beyond the first sealing frame (200C) abuts against each other and then projects inward of the first sealing frame (200C) to form a seal, and wherein, at the junction of the two adjacent edge portions (300A), a wedge-shaped sealing cross section (a) projecting inward of the first sealing frame (200C) is formed.
4. The bipolar membrane electrodialysis device according to claim 3, further comprising a plurality of position limiting portions, wherein each position limiting portion is used for limiting a position of a corresponding membrane sheet (100) moving to two compartments adjacent to the membrane sheet (100).
5. The bipolar membrane electrodialysis device according to claim 4, wherein said position-limiting portions are a position-limiting rotating shaft (430) and a plurality of first position-limiting columns (410) and a plurality of second position-limiting columns (420) disposed on both sides of the membrane sheet (100);
the water inlet of each compartment is arranged on the first side of the electrodialysis device in a mode that the overall flow direction of water flow in each compartment is the same, and the side where the water outlet of each compartment is located is the second side of the electrodialysis device;
the limiting rotating shaft (430) is arranged at one end, close to the second side, of the corresponding membrane (100), and the first limiting column (410) and the second limiting column (420) are distributed on two sides of the corresponding membrane (100) and used for limiting the limiting position of the membrane (100) to the rotation of two compartments adjacent to the membrane (100);
after the diaphragm (100) pivotally moves to the limit position around the limit rotating shaft (430), the diaphragm (100) abuts against the first limit column (410) or the second limit column (420) to block the further rotation of the diaphragm (100) in at least one direction.
6. The bipolar membrane electrodialysis device according to claim 5, wherein the first stroke switch (510) is triggered when the membrane (100) abuts against the first stopper column (410), and after the controller of the bipolar membrane electrodialysis device detects the triggered state of the first stroke switch (510), the pressure difference between the two compartments is reduced by at least one of increasing the inlet flow rate of the compartment in which the first stroke switch (510) is located, decreasing the outlet flow rate of the compartment in which the first stroke switch (510) is located, decreasing the inlet flow rate of the compartment in which the second stroke switch (520) is located, and increasing the outlet flow rate of the compartment in which the second stroke switch (520) is located until the membrane (100) is separated from the first stopper column (410); and/or
When the diaphragm (100) abuts against the second limit column (420), the second travel switch (520) is triggered, and after the controller of the bipolar membrane electrodialysis device detects that the second travel switch (520) is triggered, the pressure difference between the two compartments is reduced by at least one control mode of reducing the liquid inlet flow of the compartment where the first travel switch (510) is located, increasing the liquid outlet flow of the compartment where the first travel switch (510) is located, increasing the liquid inlet flow of the compartment where the second travel switch (520) is located, and reducing the liquid outlet flow of the compartment where the second travel switch (520) is located until the diaphragm (100) is separated from the second limit column (420).
7. The bipolar membrane electrodialysis device according to claim 6, wherein said first stroke switch (510) is mounted on the membrane sheet (100), on the end of the first restraint post (410), or directly as the first restraint post (410); and/or
The second travel switch (520) is installed on the diaphragm (100), the end part of the second limit column (420) or directly used as the second limit column (420).
8. The bipolar membrane electrodialysis device according to claim 7, wherein the controller of the bipolar membrane electrodialysis device counts the activated state of the first stroke switch (510) after detecting the activated state of the first stroke switch (510), and only when the first time period of the activated state of the first stroke switch (510) exceeds a first preset threshold value, the controller reduces the pressure difference between the two compartments by at least one of increasing the inlet flow rate of the compartment in which the first stroke switch (510) is located, decreasing the outlet flow rate of the compartment in which the first stroke switch (510) is located, decreasing the inlet flow rate of the compartment in which the second stroke switch (520) is located, and increasing the outlet flow rate of the compartment in which the second stroke switch (520) is located until the membrane (100) is separated from the first limit column (410); and/or
After detecting the triggered state of a second travel switch (520), a controller of the bipolar membrane electrodialysis device times the triggered state of the second travel switch (520), and only when a second time period for which the second travel switch (520) is triggered exceeds a second preset threshold value, the pressure difference between the two compartments is reduced to the state that the diaphragm (100) is separated from the second limit column (420) through at least one control mode of reducing the liquid inlet flow of the compartment in which the first travel switch (510) is located, increasing the liquid outlet flow of the compartment in which the first travel switch (510) is located, increasing the liquid inlet flow of the compartment in which the second travel switch (520) is located, and reducing the liquid outlet flow of the compartment in which the second travel switch (520) is located.
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| CN201811212539.8A CN109012203B (en) | 2018-10-17 | 2018-10-17 | Bipolar membrane electrodialysis device |
| CN201980010403.5A CN111902371B (en) | 2018-10-17 | 2019-01-28 | Multistage zero release treatment facility of high salt waste water that contains |
| PCT/CN2019/073404 WO2020077917A1 (en) | 2018-10-17 | 2019-01-28 | A multi-stage zero-emission treatment device for treating high-salt-content waste water |
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| CN201811212539.8A CN109012203B (en) | 2018-10-17 | 2018-10-17 | Bipolar membrane electrodialysis device |
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| WO2020077917A1 (en) * | 2018-10-17 | 2020-04-23 | Bgt Group Co., Ltd | A multi-stage zero-emission treatment device for treating high-salt-content waste water |
| CN111233099A (en) * | 2019-03-28 | 2020-06-05 | 金达泰克电子系统(北京)有限公司 | Membrane stack capable of being automatically assembled and disassembled and used for treating radioactive wastewater |
| CN110386746A (en) * | 2019-05-31 | 2019-10-29 | 中山大学 | A kind of method of bipolar membrane electrodialysis production soda acid-pyrohydrolysis-anaerobic digestion process integration processing residual active sludge |
| CN110217866B (en) * | 2019-06-25 | 2022-03-18 | 武汉长兴电器发展有限公司 | Electrodialysis device and method for treating stainless steel pickling wastewater by using electrodialysis device |
| CN110736774B (en) * | 2019-09-27 | 2022-06-07 | 杭州蓝然环境技术股份有限公司 | Electrodialysis foundation experiment standard test method |
| CN111921381B (en) * | 2020-09-17 | 2020-12-22 | 山东龙安泰环保科技有限公司 | Cooling device for electrodialyzer cathode and anode |
| CN114452821A (en) * | 2022-01-26 | 2022-05-10 | 中国科学技术大学 | Bipolar membrane electrodialysis device, method for preparing regenerated alkali by using bipolar membrane electrodialysis device and application of bipolar membrane electrodialysis device |
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