A multi-membrane stacked electrolytic treatment device for high-salt organic wastewater

Abstract

The present invention relates to the technical field of high-salt organic wastewater treatment, and in particular to a multi-membrane stacked electrolytic treatment device for high-salt organic wastewater, comprising a stack system and a direct current power supply, wherein the stack system comprises a rigid anode plate and a rigid cathode plate, wherein a plurality of stack units are sequentially arranged between the rigid cathode plate and the rigid anode plate, and a flexible bipolar plate is arranged between adjacent stack units, wherein the positive pole of the direct current power supply is connected to the anode current input terminal of the rigid anode plate and the bipolar plate anode current input terminal of the flexible bipolar plate, and the negative pole of the direct current power supply is connected to the cathode current input terminal of the rigid cathode plate and the bipolar plate cathode current input terminal of the flexible bipolar plate. Under the action of an external electric field, salt cations and salt anions undergo directional migration and enter a salt solution chamber through anion and cation exchange membranes respectively, thereby achieving the purpose of recovering salt, and at the same time, organic pollutants in the wastewater are degraded and salt is removed, thereby improving the efficiency of subsequent biochemical treatment of wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of high-salt organic wastewater treatment, and in particular to a multi-membrane stacked electrolytic treatment device for high-salt organic wastewater. Background Art

[0002] In the field of industrial wastewater, environmental pollution caused by saline organic wastewater is particularly prominent, and there are problems such as large wastewater volume, complex composition, and difficulty in treatment. Since the organic components in this type of wastewater are complex and the organic matter contained in it has no recycling value, biochemical treatment is still one of the most economical and effective means.

[0003] For conventional biochemical treatment, the high concentration of salt in such wastewater will inhibit the activity of microorganisms and reduce the efficiency of biochemical treatment. In severe cases, it will cause the microorganisms to dehydrate and die, making it difficult to operate the biochemical process. In industry, multi-effect evaporation and salt crystallization methods are usually used to remove salt from high-salinity and difficult-to-degrade organic wastewater, but the operating cost is high, and the solid salt products are usually hazardous wastes, which increases the difficulty of subsequent treatment. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-membrane stacked electrolytic treatment device for high-salt organic wastewater, aiming to achieve efficient treatment of high-salt organic wastewater, recover salt in the wastewater, and at the same time degrade organic matter in the wastewater, improve the biodegradability of the wastewater, and reduce the cost of treating such wastewater.

[0005] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0006] A multi-membrane stacked electrolytic treatment device for high-salt organic wastewater comprises a stack system and a direct current power supply, wherein the stack system comprises an anode clamping plate and a cathode clamping plate, wherein a rigid anode plate is mounted on one end of the anode clamping plate, and a rigid cathode plate is mounted on one end of the cathode clamping plate, wherein a plurality of interconnected stacking units are sequentially arranged between the rigid cathode plate and the rigid anode plate, and interconnected flexible bipolar plates are arranged between adjacent stacking units, wherein each stacking unit comprises three groups of stacked flexible partitions, wherein a cation exchange membrane is arranged between adjacent flexible partitions, and an anion exchange membrane is arranged between other adjacent flexible partitions, wherein a layer of wire mesh is embedded in the inner cavity of the flexible partition, and the flexible partition in the middle is oriented in the opposite direction to the flexible partitions on both sides thereof, wherein the positive pole of the direct current power supply is connected to the anode current input terminal of the rigid anode plate and the bipolar plate anode current input terminal of the flexible bipolar plate, and the negative pole of the direct current power supply is connected to the cathode current input terminal of the rigid cathode plate and the bipolar plate cathode current input terminal of the flexible bipolar plate.

[0007] Preferably, the rigid anode plate includes an insulating first rigid frame, an anode body is provided in an inner cavity at one end of the first rigid frame, the anode current input terminal is arranged on one side of the first rigid frame and connected to the anode body, a non-penetrating wastewater inlet hole and a saline inlet hole are provided at the lower end of the first rigid frame, and a wastewater inlet pipe connected to the wastewater inlet hole and a saline inlet pipe connected to the saline inlet hole are provided at the bottom of the first rigid frame.

[0008] Preferably, the flexible partition includes an insulating first flexible frame, the wire mesh is embedded in the inner cavity of the first flexible frame, two groups of through-type first water collection holes are provided at the upper end of the first flexible frame, one of the first water collection holes is connected to the inner cavity of the first flexible frame, and two groups of through-type first water distribution holes are provided at the lower end of the first flexible frame, one of the first water distribution holes is connected to the inner cavity of the first flexible frame, and the two groups of the first water distribution holes are respectively opposite to the wastewater inlet hole and the saline solution inlet hole.

[0009] Preferably, the flexible bipolar plate includes an insulating second flexible frame, an anode body and a cathode body are respectively embedded at both ends of the second flexible frame, the cathode current input terminal of the bipolar plate is arranged on one side of the second flexible frame and connected to the cathode body, the anode current input terminal of the bipolar plate and the cathode current input terminal of the bipolar plate are arranged on one side of the second flexible frame and are correspondingly connected to the anode body and the cathode body, the upper end of the second flexible frame is provided with two groups of through-type second water collection holes, and the second water collection holes correspond one-to-one to the first water collection holes, and the lower end of the second flexible frame is provided with two groups of through-type second water distribution holes, and the second water distribution holes correspond one-to-one to the first water distribution holes.

[0010] Preferably, the rigid cathode plate includes an insulating second rigid frame, a cathode body is embedded in one end of the second rigid frame, the cathode current input terminal is arranged on one side of the second rigid frame and connected to the cathode body, a saline outlet hole and a wastewater outlet hole which are non-penetrating and correspond to the second water collecting hole are arranged on the upper end of the second rigid frame, and a saline outlet pipe connected to the saline outlet hole and a wastewater outlet pipe connected to the wastewater outlet hole are arranged on the top of the second rigid frame.

[0011] Preferably, it also includes a salt solution circulation system and a wastewater circulation system, an anode chamber is formed between the rigid anode plate or the flexible bipolar plate and the adjacent cation exchange membrane, a cathode chamber is formed between the rigid cathode plate or the flexible bipolar plate and the adjacent anion exchange membrane, a salt solution chamber is formed between the anion exchange membrane and the adjacent cation exchange membrane, the solution in the salt solution chamber enters the salt solution circulation system, and the solution in the anode chamber and the cathode chamber enters the wastewater circulation system.

[0012] Preferably, the current density provided by the DC power supply is 0 mA / cm 2~100mA / cm 2 .

[0013] Preferably, the electrode material of the rigid anode plate is titanium coated with ruthenium, and the electrode material of the rigid cathode plate is stainless steel.

[0014] After adopting the above technical solution, the beneficial effects of the present invention are:

[0015] Under the action of the external electric field, salt cations and salt anions migrate in a directional manner and enter the salt solution chamber through the anion and cation exchange membranes respectively, achieving the purpose of recovering salt. At the same time, the salt in the wastewater is removed, improving the efficiency of subsequent biochemical treatment of wastewater. The organic matter in high-salt organic wastewater undergoes degradation reaction on the electrode surface, and the macromolecular organic matter is converted into small molecular organic matter, thereby improving the biodegradability of the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the stack system;

[0019] Figure 3 is a schematic diagram of the structure of a rigid anode plate;

[0020] Figure 4 is a schematic diagram of the structure of a flexible partition;

[0021] Figure 5 Schematic diagram of the structure of a flexible bipolar plate;

[0022] Figure 6 is a cross-sectional view of a flexible bipolar plate;

[0023] Figure 7 is a schematic diagram of the structure of a rigid cathode plate;

[0024] Figure 8 is a cross-sectional view of a rigid cathode plate;

[0025] Fig. 9 The graph of the change of sodium sulfate content in the wastewater chamber in Example 1;

[0026] Fig.10 The figure is a graph showing the change in the content of sodium sulfate in the salt solution chamber in Example 1;

[0027] Fig.11 The figure is the change of phenol content in the wastewater chamber in Example 1;

[0028] Fig.12 is a graph showing the change in the content of thiadiazole in the wastewater chamber in Example 2;

[0029] Fig.13 This is a graph showing changes in potassium sulfate content in the wastewater chamber in Example 2;

[0030] Fig.14 This is a graph showing changes in potassium sulfate content in the salt solution chamber in Example 2.

[0031] In the figure: 1-stack system, 2-salt solution circulation system, 3-salt solution storage tank, 4-salt solution circulation pump, 5-DC power supply, 6-waste water circulation pump, 7-waste water storage tank, 8-waste water circulation system, 9-anode clamping plate, 10-rigid anode plate, 11-flexible bipolar plate, 12-cathode clamping plate, 13-rigid cathode plate, 14-anion exchange membrane, 15-cation exchange membrane, 16-cathode chamber, 17-salt solution chamber, 18-anode chamber, 19-anode body, 20-salt solution chamber Liquid water inlet hole, 21-salt solution water inlet pipe, 22-wastewater water inlet pipe, 23-wastewater water inlet hole, 24-anode current input terminal, 25-flexible partition, 26-first water distribution hole, 27-wire mesh, 28-first water collection hole, 29-second water distribution hole, 30-bipolar plate anode current input terminal, 31-second water collection hole, 32-cathode body, 33-cathode current input terminal, 34-salt solution water outlet hole, 35-salt solution water outlet pipe, 36-wastewater outlet pipe, 37-wastewater outlet hole. DETAILED DESCRIPTION

[0032] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0033] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] A multi-membrane stacked electrolytic treatment device for high-salinity organic wastewater comprises a stack system 1, a salt solution circulation system 2, a DC power supply 5 and a wastewater circulation system 8. The salt solution circulation system 2 comprises a salt solution storage tank 3 and a salt solution circulation pump 4, and the wastewater circulation system 8 comprises a wastewater storage tank 7 and a wastewater circulation pump 6.

[0035] The left end of the stack system 1 is an anode clamping plate 9, and the right end is a cathode clamping plate 12. A rigid anode plate 10 is installed on the end of the anode clamping plate 9 facing the cathode clamping plate 12, and a rigid cathode plate 13 is installed on the end of the cathode clamping plate 12 facing the anode clamping plate 9. Between the rigid cathode plate 13 and the rigid anode plate 10, a plurality of interconnected stack units are arranged in sequence, and interconnected flexible bipolar plates 11 are arranged between adjacent stack units.

[0036] Each stack unit is composed of a cation exchange membrane 15, an anion exchange membrane 14 and three groups of stacked flexible partitions 25, forming a unique "sandwich" structure of "flexible partition 25-cation exchange membrane 15-flexible partition 25-anion exchange membrane 14-flexible partition 25".

[0037] An anode chamber 18 is formed between the rigid anode plate 10 (or the flexible bipolar plate 11, when the cation exchange membrane 15 is adjacent to the anode side of the flexible bipolar plate 11) and the adjacent cation exchange membrane 15, a cathode chamber 16 is formed between the rigid cathode plate 13 (or the flexible bipolar plate 11, when the anion exchange membrane 14 is adjacent to the cathode side of the flexible bipolar plate 11) and the adjacent anion exchange membrane 14, the anode chamber 18 and the cathode chamber 16 together constitute a wastewater chamber, and a salt solution chamber 17 is formed between the anion exchange membrane 14 and the adjacent cation exchange membrane 15.

[0038] The rigid anode plate 10 includes a first rigid frame and an anode current input terminal 24, one end of the first rigid frame is provided with an inner cavity, and the inner cavity is embedded with an anode body 19. The anode current input terminal 24 is arranged on one side of the first rigid frame and is connected to the anode body 19 to provide a stable current input for the anode body 19. The lower end of the first rigid frame is provided with a non-penetrating wastewater inlet hole 23 and a saline inlet hole 20, and the bottom of the first rigid frame is provided with a wastewater inlet pipe 22 connected to the wastewater inlet hole 23 and a saline inlet pipe 21 connected to the saline inlet hole 20.

[0039] The flexible partition 25 includes a first flexible frame and a wire mesh 27. The wire mesh 27 is embedded in the inner cavity of the first flexible frame to play a filtering role to prevent large particles from contaminating the ion exchange membrane. The wire mesh 27 is usually made of corrosion-resistant, high-strength metal wire or synthetic fiber, such as stainless steel wire, polyester fiber, etc. Two groups of through-type first water collection holes 28 are provided at the upper end of the first flexible frame, and one of the first water collection holes 28 is connected to the inner cavity of the first flexible frame. Two groups of through-type first water distribution holes 26 are provided at the lower end of the first flexible frame, and one of the first water distribution holes 26 is connected to the inner cavity of the first flexible frame. The two groups of first water distribution holes 26 are respectively opposite to the wastewater inlet hole 23 (opposite to the first water distribution hole 26 connected to the inner cavity of the first flexible frame) and the saline solution inlet hole 20. In the "sandwich" structure, the flexible partition 25 in the middle is in the opposite direction to the flexible partitions 25 on both sides thereof. As Figure 4 In the figure, the first water distribution hole 26 connected to the inner cavity of the first flexible frame is on the left, but the middle flexible partition 25 is on the right, and the first water collection hole 28 is the same.

[0040] The flexible bipolar plate 11 includes a second flexible frame, and the two ends of the second flexible frame are respectively embedded with an anode body 19 and a cathode body 32, and one side of the second flexible frame is provided with a bipolar plate cathode current input terminal connected to the cathode body 32 and a bipolar plate anode current input terminal 30 connected to the anode body 19. The upper end of the second flexible frame is provided with two groups of through-type second water collection holes 31, and the second water collection holes 31 correspond one-to-one with the first water collection holes 28. The lower end of the second flexible frame is provided with two groups of through-type second water distribution holes 29, and the second water distribution holes 29 correspond one-to-one with the first water distribution holes 26.

[0041] The rigid cathode plate 13 includes a second rigid frame and a cathode current input terminal 33, one end of the second rigid frame is embedded with a cathode body 32, and the cathode current input terminal 33 is arranged on one side of the second rigid frame and connected to the cathode body 32. The upper end of the second rigid frame is provided with a saline outlet hole 34 and a wastewater outlet hole 37 which are not penetrated and correspond to the second water collecting hole 31, and the top of the second rigid frame is provided with a saline outlet pipe 35 connected to the saline outlet hole 34 and a wastewater outlet pipe 36 connected to the wastewater outlet hole 37.

[0042] The material of the anode body 19 is titanium coated with ruthenium, and the material of the cathode body 32 is stainless steel. The first rigid frame, the first flexible frame, the second flexible frame, and the second rigid frame are all made of insulating materials (such as rubber, plastic, or other synthetic materials), which can effectively isolate the current and ensure that the current will not leak through the frame, avoiding safety hazards such as short circuit or electric shock. If rubber is used, when the frame is squeezed and stacked, the deformation of the contact surface can fill the small gap between the components, enhance the sealing effect, and reduce the possibility of liquid leakage.

[0043] The DC power supply 5 is a constant current source, providing a current density of 0 mA / cm 2 ~100mA / cm 2 The positive pole of the DC power supply 5 is connected to the anode current input terminal 24 of the rigid anode plate 10 and the bipolar plate anode current input terminal 30 of the flexible bipolar plate 11 , and the negative pole of the DC power supply 5 is connected to the cathode current input terminal 33 of the rigid cathode plate 13 and the bipolar plate cathode current input terminal of the flexible bipolar plate 11 .

[0044] The wastewater stored in the wastewater storage tank 7 enters the stack system 1 from the wastewater inlet pipe 22 through the wastewater pipeline under the action of the wastewater circulation pump 6, and the wastewater in the stack system 1 is evenly distributed to the cathode chamber 16 and the anode chamber 18 through the first water distribution hole 26 below the flexible partition 25. Under the action of the electric field, the cations in the anode chamber 18 pass through the cation exchange membrane 15 and are ready to migrate to the adjacent cathode chamber 16, but are blocked by the anion exchange membrane 14, so the cations stay in the salt solution chamber 17. Similarly, the anions in the cathode chamber 16 move to the salt solution chamber 17 through the anion exchange membrane 14, and form a salt solution with the cations in the salt solution chamber 17. After being treated by the stack system 1, the effluent in the cathode chamber 16 and the anode chamber 18 is discharged from the first water collecting hole 28 of the flexible partition 25, and flows out through the wastewater outlet pipe 36 on the rigid cathode plate 13, and enters the wastewater storage tank 7 through the wastewater return pipe, completing a wastewater treatment cycle. This cycle is repeated multiple times to ensure the effect of high-salt organic wastewater pretreatment.

[0045] The salt solution in the salt solution chamber 17 is collected by the first water collection hole 28 of the flexible partition 25 (the flexible partition 25 is located between the cation exchange membrane 15 and the anion exchange membrane 14, and the position of the first water collection hole 28 in the inner cavity of the flexible partition 25 is connected to the first water collection hole 28 of the flexible partition 25). Figure 4 The brine is discharged from the rigid cathode plate 13 through the brine outlet pipe 35 and enters the wastewater storage tank 7 through the brine return pipe. Then, under the action of the brine circulation pump 4, the brine re-enters the stack system 1 from the brine inlet hole 20 through the brine pipeline to complete a brine concentration cycle, and the cycle is repeated multiple times to ensure the effect of high-salt organic wastewater pretreatment.

[0046] During the treatment process, low-voltage direct current electrolyzes water, and water molecules are partially oxidized into ozone. Ozone directly reacts with water molecules to produce hydrogen peroxide, which degrades organic macromolecules into small molecules, thereby improving the wastewater treatment effect.

[0047] Example 1

[0048] The present invention is used to treat phenol wastewater. The solution in the wastewater chamber is phenol wastewater containing sodium sulfate, wherein the phenol concentration is 808 mg / L, the sodium sulfate content is 1462 mg / L, and the total is 1000 mL. During the operation of the device, the phenol wastewater circulates alone. The solution in the salt solution chamber 17 is a dilute solution containing sodium sulfate, wherein the sodium sulfate content is 155 mg / L, and the total is 1000 mL. During the operation of the device, the dilute sodium sulfate solution circulates alone. At a current density of 10 mA / cm 2 Under the conditions, after the solution in the wastewater chamber was treated for 30 minutes, the desalination rate of phenol wastewater could reach 81.87%, the phenol degradation rate was as high as 98.95%, the sodium sulfate concentration in the salt solution chamber 17 was as high as 1326 mg / L, and the phenol content was as low as 0.36 mg / L.

[0049] Example 2

[0050] The present invention is used to treat thiadiazole wastewater. The solution in the wastewater chamber is thiadiazole wastewater containing potassium sulfate, wherein the thiadiazole content is 486.91 mg / L, the potassium sulfate content is 34950 mg / L, and the total is 1000 mL. The thiadiazole wastewater circulates alone. The solution in the salt solution chamber 17 is a dilute solution containing potassium sulfate, wherein the potassium sulfate content is 1770 mg / L, and the total is 1000 mL. The dilute potassium sulfate solution circulates. At a current density of 50 mA / cm 2 Under the conditions, after the solution in the wastewater chamber was treated for 180 minutes, the wastewater desalination rate was 84.55%, the thiadiazole degradation rate was 97.64%, the potassium sulfate content in the salt solution chamber 17 was 29690 mg / L, and the thiadiazole content was 199.60 mg / L.

[0051] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-membrane stacked electrolytic treatment device for high-salinity organic wastewater, characterized in that: The invention comprises a stack system (1) and a DC power supply (5), wherein the stack system (1) comprises an anode clamping plate (9) and a cathode clamping plate (12), wherein a rigid anode plate (10) is mounted on one end of the anode clamping plate (9), and a rigid cathode plate (13) is mounted on one end of the cathode clamping plate (12), wherein a plurality of interconnected stack units are arranged in sequence between the rigid cathode plate (13) and the rigid anode plate (10), and interconnected flexible bipolar plates (11) are arranged between adjacent stack units; each stack unit comprises a cation exchange membrane (15), an anion exchange membrane (14) and three groups of flexible partitions (25), forming a flexible partition (25)-cation exchange membrane (15). The invention discloses a sandwich structure of anion exchange membrane (15)-flexible partition (25)-anion exchange membrane (14)-flexible partition (25), wherein a layer of wire mesh (27) is embedded in the inner cavity of each flexible partition (25), and the flexible partition (25) located in the middle of the sandwich structure is oriented in the opposite direction to the flexible partitions (25) on both sides thereof; the positive electrode of the DC power supply (5) is connected to the anode current input terminal (24) of the rigid anode plate (10) and the bipolar plate anode current input terminal (30) of the flexible bipolar plate (11), and the negative electrode of the DC power supply (5) is connected to the cathode current input terminal (33) of the rigid cathode plate (13) and the bipolar plate cathode current input terminal of the flexible bipolar plate (11).

2. The multi-membrane stacked electrolytic treatment device for high-salt organic wastewater according to claim 1, characterized in that: The rigid anode plate (10) comprises an insulating first rigid frame, an anode body (19) is provided in an inner cavity at one end of the first rigid frame, the anode current input terminal (24) is arranged on one side of the first rigid frame and connected to the anode body (19), a non-penetrating wastewater inlet hole (23) and a saline inlet hole (20) are provided at the lower end of the first rigid frame, and a wastewater inlet pipe (22) connected to the wastewater inlet hole (23) and a saline inlet pipe (21) connected to the saline inlet hole (20) are provided at the bottom of the first rigid frame.

3. The multi-membrane stacked electrolytic treatment device for high-salt organic wastewater according to claim 2, characterized in that: The flexible partition (25) comprises an insulating first flexible frame, the wire mesh (27) is embedded in the inner cavity of the first flexible frame, the upper end of the first flexible frame is provided with two groups of through-type first water collection holes (28), one of which is in communication with the inner cavity of the first flexible frame, and the lower end of the first flexible frame is provided with two groups of through-type first water distribution holes (26), one of which is in communication with the inner cavity of the first flexible frame, and the two groups of the first water distribution holes (26) are respectively opposite to the wastewater inlet hole (23) and the salt solution inlet hole (20).

4. The multi-membrane stacked electrolytic treatment device for high-salt organic wastewater according to claim 3, characterized in that: The flexible bipolar plate (11) comprises an insulating second flexible frame, wherein an anode body (19) and a cathode body (32) are respectively embedded at two ends of the second flexible frame, the cathode current input end of the bipolar plate is arranged on one side of the second flexible frame and connected to the cathode body (32), the anode current input end (30) of the bipolar plate and the cathode current input end of the bipolar plate are arranged on one side of the second flexible frame and are correspondingly connected to the anode body (19) and the cathode body (32), the upper end of the second flexible frame is provided with two groups of through-type second water collection holes (31), the second water collection holes (31) correspond one-to-one with the first water collection holes (28), and the lower end of the second flexible frame is provided with two groups of through-type second water distribution holes (29), the second water distribution holes (29) correspond one-to-one with the first water distribution holes (26).

5. The multi-membrane stacked electrolytic treatment device for high-salinity organic wastewater according to claim 4, characterized in that: The rigid cathode plate (13) comprises an insulating second rigid frame, a cathode body (32) is embedded in one end of the second rigid frame, the cathode current input terminal (33) is arranged on one side of the second rigid frame and connected to the cathode body (32), a saline outlet hole (34) and a wastewater outlet hole (37) which are non-penetrating and correspond to the second water collection hole (31) are arranged at the upper end of the second rigid frame, and a saline outlet pipe (35) connected to the saline outlet hole (34) and a wastewater outlet pipe (36) connected to the wastewater outlet hole (37) are arranged at the top of the second rigid frame.

6. The multi-membrane stacked electrolytic treatment device for high-salt organic wastewater according to claim 1, characterized in that: The invention also comprises a salt solution circulation system (2) and a wastewater circulation system (8), wherein an anode chamber (18) is formed between the rigid anode plate (10) or the flexible bipolar plate (11) and the adjacent cation exchange membrane (15), a cathode chamber (16) is formed between the rigid cathode plate (13) or the flexible bipolar plate (11) and the adjacent anion exchange membrane (14), and a salt solution chamber (17) is formed between the anion exchange membrane (14) and the adjacent cation exchange membrane (15), the solution in the salt solution chamber (17) enters the salt solution circulation system (2), and the solution in the anode chamber (18) and the cathode chamber (16) enters the wastewater circulation system (8).

7. The multi-membrane stacked electrolytic treatment device for high-salinity organic wastewater according to claim 1, characterized in that: The current density provided by the DC power supply (5) is 0 mA / cm 2 ~100mA / cm 2 .

8. The multi-membrane stacked electrolytic treatment device for high-salinity organic wastewater according to claim 1, characterized in that: The electrode material of the rigid anode plate (10) is titanium coated with ruthenium, and the electrode material of the rigid cathode plate (13) is stainless steel.

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