A microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater

Abstract

The present invention discloses a microfluidic multi-membrane stack electrolysis device for treating high-salt organic wastewater, comprising a membrane stack, a power supply, and a circulation pipeline. The membrane stack is a stacked structure comprising an anode electrode chamber, an alkali solution chamber, an acid solution chamber, and a cathode electrode chamber, formed by an anode electrode plate, a porous adsorption material, a sealing gasket, a cation exchange membrane, a sealing gasket, a bipolar membrane, a sealing gasket, an anion exchange membrane, a sealing gasket, and a cathode electrode plate. The power supply is a direct current power supply comprising positive and negative output terminals. The circulation pipeline comprises a pipeline, a pump, and a liquid storage tank. Wastewater, acid solution, and alkali solution are respectively introduced through the water inlets of the anode and cathode electrode plates, pass through the interior of the membrane stack, and then are respectively discharged from the water outlets of the anode and cathode electrode plates to the wastewater, acid solution, and alkali solution storage tanks. The present invention provides a treatment device that effectively treats high-salt organic wastewater, converts salt in the wastewater into acid and alkali, simultaneously degrades organic matter in the wastewater, and improves the biodegradability of the wastewater; the device is primarily used for treating high-salt organic industrial wastewater.

Description

Technical Field

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

[0002] High-salinity organic wastewater poses a significant environmental pollution problem. Evaporation and crystallization are commonly used in industry to remove salt from such wastewater, but this process is costly and difficult to process. Conventional biochemical treatments inhibit microbial activity due to high salt concentrations, reducing treatment efficiency. In severe cases, they can cause microbial dehydration and death, leading to the collapse of the biochemical system. Furthermore, toxic, recalcitrant organic matter in the wastewater can also reduce biochemical treatment efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater, realizing the resource utilization of salt in the wastewater, improving the biodegradability of the wastewater, and reducing the cost of treating such wastewater.

[0004] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0005] A microfluidic multi-membrane stack electrolysis device for treating high-salt organic wastewater comprises a membrane stack, a power supply, and a circulation pipeline. The membrane stack comprises an anode electrode plate at the left end and a cathode electrode plate at the right end. An anode electrode chamber, a cation exchange membrane, an alkali solution chamber, a bipolar membrane, an acid solution chamber, an anion exchange membrane, and a cathode electrode chamber are sequentially arranged between the anode and cathode electrode plates from left to right. The power supply is a DC power supply, with its positive electrode connected to the anode electrode plate and its negative electrode connected to the cathode electrode plate. The circulation pipeline comprises three independent circulation pipelines for wastewater, alkali solution, and acid solution. The wastewater circulation pipeline comprises a wastewater storage tank, a wastewater pump, and a wastewater pipeline, which are sequentially connected. The alkali solution circulation pipeline comprises an alkali solution storage tank, an alkali solution pump, and an alkali solution pipeline, which are sequentially connected. The acid solution circulation pipeline comprises an acid solution storage tank, an acid solution pump, and an acid solution pipeline, which are sequentially connected. Wastewater only enters the wastewater circulation pipeline and is treated in the anode electrode chamber and the cathode electrode chamber respectively; alkali solution only enters the alkali solution circulation pipeline and is treated in the alkali solution chamber; acid solution only enters the acid solution circulation pipeline and is treated in the acid solution chamber.

[0006] Furthermore, the positive electrode plate is a corrosion-resistant anode, and the negative electrode plate is a corrosion-resistant cathode;

[0007] Furthermore, the anode chamber is filled with a porous adsorption material to form a microfluidic reaction environment, and the particle size of the porous adsorption material is screened as needed;

[0008] Furthermore, the power supply is a DC power supply, which is required to be a constant current source or a constant voltage source, and can provide a current density range of 0 mA / cm 2 ~150mA / cm 2 ;

[0009] Reaction principle of microfluidic multi-membrane stack electrolysis device:

[0010] Anode chamber reaction: H2O-e - → OH+H + (or OH - -e - →·OH); RH+·OH→R·+H2O, the addition of porous adsorption materials increases the ratio of the specific surface area of ​​the reactor to the volume of the reaction chamber, promoting the transformation of the anode chamber into a microfluidic reactor;

[0011] Cathodic chamber reaction: 2H2O+4e - →2OH - +H2;

[0012] Reaction in the acid chamber: H + +N m- →H m N;

[0013] Reaction in alkali solution chamber: M n+ +OH - →M(OH) n .

[0014] The microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater of the present invention has the following advantages:

[0015] (1) The microfluidic multi-membrane stacked electrolysis device for high-salt organic wastewater uses a microfluidic multi-membrane stacked electrolysis process to recover salt resources and reduce the cost of subsequent wastewater treatment. Under the action of an external electric field, cations and anions in the wastewater undergo directional migration and enter the acid and alkali solution chamber through the anion and cation exchange membranes, respectively, to achieve the purpose of salt recovery.

[0016] (2) High-salt organic wastewater directly enters the electrode chamber, where organic matter undergoes degradation reactions, converting large molecular organic matter into small molecular organic matter, thereby improving the biodegradability of the wastewater.

[0017] (3) The microfluidic multi-membrane stacked electrolysis device has a simple configuration and utilizes the free radicals generated by the electrode reaction to reduce the protection of the free radicals on the membrane, while also improving the energy efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a microfluidic multi-membrane stacked electrolysis device;

[0019] Figure 2 This is a schematic diagram of the membrane stack structure and water inlet method;

[0020] Explanation of the marks in the figure: 1. Membrane stack; 2. Power supply; 3. Circulation pipeline; 4. Wastewater storage tank; 5. Wastewater pump; 6. Wastewater pipeline; 7. Alkali storage tank; 8. Alkali pump; 9. Alkali pipeline; 10. Acid storage tank; 11. Acid pump; 12. Acid pipeline; 13. Anode plate; 14. Anode chamber; 15. Cation exchange membrane; 16. Alkali chamber; 17. Bipolar membrane; 18. Acid chamber; 19. Anion exchange membrane; 20. Cathodic chamber; 21. Cathodic plate; 22. Porous adsorption material. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater of the present invention in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, the left end of the membrane stack is the anode electrode plate, and the right end is the cathode electrode plate; the anode electrode chamber, cation exchange membrane, alkali solution chamber, bipolar membrane, acid solution chamber, anion exchange membrane and cathode electrode chamber are arranged in sequence from left to right between the anode electrode plate and the cathode electrode plate; the power supply is a DC power supply, the positive electrode of which is connected to the anode electrode plate, and the negative electrode is connected to the cathode electrode plate; the circulation pipeline includes three independent circulation pipelines for wastewater, alkali solution and acid solution; the wastewater circulation pipeline includes a wastewater storage tank, a wastewater pump and a wastewater pipeline; the alkali solution circulation pipeline includes an alkali solution storage tank, an alkali solution pump and an alkali solution pipeline; the acid solution circulation pipeline includes an acid solution storage tank, an acid solution pump and an acid solution pipeline; the power supply is a DC power supply, which is required to be a constant current source or a constant voltage source, and can provide a current density range of 0mA / cm 2 ~150mA / cm 2 .

[0023] like Figure 2 As shown, the anode plate is a corrosion-resistant anode, and the cathode plate is a corrosion-resistant cathode; the anode chamber is filled with porous adsorption material 22 to form a microfluidic reaction environment, and the particle size of the porous adsorption material is screened as needed; the wastewater only enters the wastewater circulation pipeline and is treated by the anode chamber and the cathode chamber respectively, the alkali solution enters the alkali solution circulation pipeline and is treated by the alkali solution chamber; the acid solution enters the acid solution circulation pipeline and is treated by the acid solution chamber.

[0024] Specifically, the wastewater stored in the wastewater storage tank 4 enters the membrane stack 1 through the wastewater pipeline 6 under the action of the wastewater pump 5; the alkali stored in the alkali storage tank 7 enters the membrane stack 1 through the alkali pipeline 9 under the action of the alkali pump 8; the acid stored in the acid storage tank 10 enters the membrane stack 1 through the acid pipeline 12 under the action of the acid pump 11. The positive electrode of the power supply 2 is connected to the anode electrode plate 13, and the negative electrode is connected to the cathode electrode plate 21. Under the action of the electric field, the cations in the anode electrode chamber 14 migrate to the alkali chamber 16 through the cation exchange membrane 15, and react with the OH produced by the bipolar membrane 17. -Combined to produce base; anions in the cathode chamber 20 move through the anion exchange membrane 19 to the acid chamber 18, and the H produced by the bipolar membrane 17 + Combined, they produce acid. Simultaneously, in the anodic chamber 14, organic macromolecules are degraded into small molecules. After treatment by the membrane stack 1, the effluent from the anodic chamber 14 and the cathodic chamber 20 enters the wastewater storage tank 4 via the wastewater pipeline 6, completing one cycle of wastewater treatment. The alkali produced by the reaction in the alkali chamber 16 enters the alkali storage tank 7 via the alkali pipeline 9, completing one cycle of alkali concentration. The acid produced by the reaction in the acid chamber 18 enters the acid storage tank 10 via the acid pipeline 12, completing one cycle of acid concentration. This cycle repeats multiple times to ensure the effective pretreatment of high-salt organic wastewater.

[0025] The above-mentioned microfluidic multi-membrane stacked electrolysis device is used, and the anode chamber is filled with 2g granular carbon of 20-40 mesh. The solution to be treated in the wastewater chamber is high-concentration potassium sulfate thiadiazole wastewater, with a thiadiazole content of 488.22 mg / L and a K2SO4 content of 64.99 g / L, totaling 1000 mL, and the thiadiazole wastewater circulates alone. The solution in the alkali chamber is pure water, totaling 1000 mL, and the alkali solution circulates alone. The solution in the acid chamber is pure water, totaling 1000 mL, and the acid solution circulates alone. At a current density of 30 mA / cm 2 Under the conditions, after the solution in the wastewater chamber was treated for 330 minutes, the wastewater desalination rate was 80.68%, the thiadiazole degradation rate was 99.55%, the KOH concentration recovered in the alkali solution chamber was 0.64 mol / L, and the H2SO4 concentration recovered in the acid solution chamber was 0.31 mol / L.

[0026] The above-mentioned microfluidic multi-membrane stacked electrolysis device is used, and 2g granular carbon of 20-40 mesh is filled in the anode chamber. The solution to be treated in the wastewater chamber is high-concentration potassium sulfate thiadiazole wastewater, with a thiadiazole content of 505.15 mg / L and a K2SO4 content of 63.82 g / L, totaling 1000 mL, and the thiadiazole wastewater circulates alone. The solution in the alkali chamber is pure water, totaling 1000 mL, and the alkali solution circulates alone. The solution in the acid chamber is pure water, totaling 1000 mL, and the acid solution circulates alone. At a current density of 50 mA / cm 2 Under the conditions, after the solution in the wastewater chamber was treated for 210 minutes, the wastewater desalination rate was 84.48%, the thiadiazole degradation rate was 99.13%, the KOH concentration recovered in the alkali solution chamber was 0.70 mol / L, and the H2SO4 concentration recovered in the acid solution chamber was 0.35 mol / L.

[0027] The microfluidic multi-membrane stacked electrolysis device described above was used, with the anode chamber filled with 2g of 20-40 mesh granular carbon. The solution to be treated in the wastewater chamber was 1000mL of wastewater containing high-concentration potassium sulfate and thiadiazole, with a thiadiazole content of 519.88mg / L and a K2SO4 content of 64.66g / L. The thiadiazole wastewater was circulated separately. The solution in the alkali chamber was pure water, totaling 1000mL, which was circulated separately. The solution in the acid chamber was pure water, totaling 1000mL, which was circulated separately. At a current density of 70mA / cm2, after 150 minutes of treatment, the wastewater desalination rate in the wastewater chamber was 87.97%, the thiadiazole degradation rate was 96.32%, the KOH concentration recovered in the alkali chamber was 0.73mol / L, and the H2SO4 concentration recovered in the acid chamber was 0.38mol / L.

[0028] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater, characterized in that: It includes a membrane stack (1), a power supply (2) and a circulation pipeline (3); The membrane stack (1) has an anode electrode plate (13) at its left end and a cathode electrode plate (21) at its right end; an anode electrode chamber (14), a cation exchange membrane (15), an alkali solution chamber (16), a bipolar membrane (17), an acid solution chamber (18), an anion exchange membrane (19) and a cathode electrode chamber (20) are sequentially arranged between the anode electrode plate (13) and the cathode electrode plate (21) from left to right; the power supply (2) is a direct current power supply, the positive electrode of which is connected to the anode electrode plate (13) and the negative electrode is connected to the cathode electrode plate (21); the circulation pipeline (3) includes three independent The circulation pipelines are respectively a wastewater circulation pipeline, an alkali solution circulation pipeline and an acid solution circulation pipeline; the wastewater circulation pipeline comprises a wastewater storage tank (4), a wastewater pump (5), a wastewater pipeline (6), an anode electrode chamber (14) and a cathode electrode chamber (20) which are connected in sequence; the alkali solution circulation pipeline comprises an alkali solution storage tank (7), an alkali solution pump (8), an alkali solution pipeline (9) and an alkali solution chamber (16) which are connected in sequence; the acid solution circulation pipeline comprises an acid solution storage tank (10), an acid solution pump (11), an acid solution pipeline (12) and an acid solution chamber (18) which are connected in sequence; Wastewater only enters the wastewater circulation pipeline (6) and is processed by the anode electrode chamber (14) and the cathode electrode chamber (20), and alkali liquid only enters the alkali liquid circulation pipeline (9) and is processed by the alkali liquid chamber (16); The acid solution only enters the acid solution circulation pipeline (12) and is processed in the acid solution chamber (18).

2. A microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater according to claim 1, characterized in that: The anode electrode plate (13) is a corrosion-resistant anode, and the cathode electrode plate (21) is a corrosion-resistant cathode.

3. The microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater according to claim 1, characterized in that: The anode chamber (14) is filled with a porous adsorption material (22) to form a microfluidic reaction environment, and the particle size of the porous adsorption material (22) is screened according to the requirements of the electrode plate gap.

4. The microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater according to claim 1, characterized in that: The cation exchange membrane (15) and the anion exchange membrane (19) are homogeneous or heterogeneous ion exchange membranes.

5. The microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater according to claim 1, characterized in that: The power supply (2) is a DC power supply, which is required to be a constant current source or a constant voltage source, providing a current density range of 0 mA / cm 2 ~150mA / cm 2 .

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