Microfluid multi-film stacked electrolysis device for treating high-salt organic wastewater

Abstract

The invention discloses a microfluid multi-membrane stacked electrolysis device for treating high-salt organic wastewater. The device comprises a membrane stack, a power supply and a circulating pipeline, the membrane stack is of a stacked structure of a positive electrode chamber, an alkali liquor chamber, an acid liquor chamber and a negative electrode chamber which are formed by a positive electrode plate, a porous adsorption material, a sealing washer, a cation exchange membrane, a sealing washer, a bipolar membrane, a sealing washer, an anion exchange membrane, a sealing washer and a negative electrode plate. The power supply is a direct-current power supply and comprises a positive output end and a negative output end. The circulating pipeline comprises a pipeline, a pump and a liquid storage tank, and wastewater, acid liquor and alkali liquor are respectively introduced from the water inlets of the positive and negative electrode plates, pass through the interior of the membrane stack and are respectively guided into the wastewater, acid liquor and alkali liquor storage tank from the water outlets of the positive and negative electrode plates. The invention provides a treatment device for effectively treating high-salt organic wastewater, converting salt in the wastewater into acid and alkali, degrading organic matters in the wastewater and improving the biodegradability of the wastewater. The method is mainly used for treating high-salt organic industrial wastewater.

Description

Technical Field

[0001] The 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] The environmental pollution caused by high-salt organic wastewater is a prominent problem. Evaporation and crystallization are often used in industry to remove salt from such wastewater, but the operating cost is high and the subsequent treatment is difficult. For conventional biochemical treatment, the high concentration of salt in such wastewater inhibits the activity of microorganisms and reduces its treatment efficiency. In severe cases, it will cause the microorganisms to dehydrate and die, causing the biochemical system to collapse. In addition, toxic and difficult-to-degrade organic matter in the wastewater will also reduce the efficiency of biochemical treatment. 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, so as to realize the resource utilization of salt in the wastewater, improve the biodegradability of the wastewater, and reduce 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 stacked electrolysis device for treating high-salt organic wastewater includes a membrane stack, a power supply and a circulation pipeline. The left end of the membrane stack is an anode electrode plate, and the right end is a cathode electrode plate; 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 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 connected in sequence; the alkali solution circulation pipeline includes an alkali solution storage tank, an alkali solution pump and an alkali solution pipeline connected in sequence; the acid solution circulation pipeline includes an acid solution storage tank, an acid solution pump and an acid solution pipeline connected in sequence. 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] Further, 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 porous adsorption material to form a microfluidic reaction environment, and the particle size of the porous adsorption material is screened according to needs;

[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 stacked 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, and promotes 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 room: 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 adopts a microfluidic multi-membrane stacked electrolysis process to recycle salt resources and reduce the cost of subsequent wastewater treatment. Under the action of an external electric field, cations and anions in the wastewater migrate in a directional manner and enter the acid and alkali liquid chamber through the anion and cation exchange membranes, respectively, to achieve the purpose of recovering salt.

[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 It is a schematic diagram of the structure of a microfluidic multi-membrane stacked electrolysis device;

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

[0020] Explanation of the markings 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 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 positive electrode plate is a corrosion-resistant anode, and the negative electrode plate is a corrosion-resistant cathode; the positive electrode 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 according to needs; the wastewater only enters the wastewater circulation pipeline, and is treated by the positive electrode chamber and the negative electrode chamber respectively, the alkali liquid enters the alkali liquid circulation pipeline, and is treated by the alkali liquid chamber; the acid liquid enters the acid liquid circulation pipeline, and is treated by the acid liquid 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 generated by the bipolar membrane 17. -Combined to produce base; anions in the cathode chamber 20 move to the acid chamber 18 through the anion exchange membrane 19 and react with H produced by the bipolar membrane 17 + Combined to produce acid. At the same time, organic macromolecules in the anode chamber 14 are degraded into small molecules. After being treated by the membrane stack 1, the effluent in the anode chamber 14 / cathode chamber 20 enters the wastewater storage tank 4 through the wastewater pipeline 6, completing a cycle of wastewater treatment; the alkali liquid produced by the reaction in the alkali liquid chamber 16 enters the alkali liquid storage tank 7 through the alkali liquid pipeline 9, completing a cycle of alkali liquid concentration; the acid liquid produced by the reaction in the acid liquid chamber 18 enters the acid liquid storage tank 10 through the acid liquid pipeline 12, completing a cycle of acid liquid concentration; this cycle is repeated multiple times to ensure the effect of high-salt organic wastewater pretreatment.

[0025] The above-mentioned microfluidic multi-membrane stacked electrolysis device is used, and 2g of 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, the thiadiazole content is 488.22mg / L, the K2SO4 content is 64.99g / L, totaling 1000mL, and the thiadiazole wastewater circulates alone. The solution in the alkali solution chamber is pure water, totaling 1000mL, and the alkali solution circulates alone. The solution in the acid solution chamber is pure water, totaling 1000mL, and the acid solution circulates alone. At a current density of 30mA / cm 2 Under the conditions, after the solution in the wastewater chamber was treated for 330 minutes, the desalination rate of wastewater was 80.68%, the degradation rate of thiadiazole was 99.55%, the concentration of KOH recovered in the alkali solution chamber was 0.64 mol / L, and the concentration of H2SO4 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 of 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, the thiadiazole content is 505.15mg / L, the K2SO4 content is 63.82g / L, totaling 1000mL, and the thiadiazole wastewater circulates alone. The solution in the alkali solution chamber is pure water, totaling 1000mL, and the alkali solution circulates alone. The solution in the acid solution chamber is pure water, totaling 1000mL, and the acid solution circulates alone. At a current density of 50mA / cm 2 Under the conditions, after the solution in the wastewater chamber was treated for 210 minutes, the desalination rate of wastewater was 84.48%, the degradation rate of thiadiazole was 99.13%, the concentration of KOH recovered in the alkali solution chamber was 0.70 mol / L, and the concentration of H2SO4 recovered in the acid solution chamber was 0.35 mol / L.

[0027] The above-mentioned microfluidic multi-membrane stacked electrolysis device is used, and 20-40 mesh 2g granular carbon is filled in the anode chamber. The solution to be treated in the wastewater chamber is high-concentration potassium sulfate thiadiazole wastewater, the thiadiazole content is 519.88mg / L, the K2SO4 content is 64.66g / L, a total of 1000mL, and the thiadiazole wastewater circulates alone. The solution in the alkali chamber is pure water, a total of 1000mL, and the alkali solution circulates alone. The solution in the acid chamber is pure water, a total of 1000mL, and the acid solution circulates alone. Under the condition of a current density of 70mA / cm2, after the solution in the wastewater chamber is treated for 150min, the wastewater desalination rate is 87.97%, the thiadiazole degradation rate is 96.32%, the KOH concentration recovered in the alkali chamber is 0.73mol / L, and the H2SO4 concentration recovered in the acid chamber is 0.38mol / L.

[0028] It is to be understood that the present invention is described by some embodiments, and it is known to 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 by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater, characterized in that: It comprises a membrane stack (1), a power supply (2) and a circulation pipeline (3); The left end of the membrane stack (1) is an anode electrode plate (13), and the right end is a cathode electrode plate (21); 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 arranged in sequence from left to right between the anode electrode plate (13) and the cathode electrode plate (21); the power source (2) is a direct current power source, the positive electrode of which is connected to the anode electrode plate (13), and the negative electrode of which is connected to the cathode electrode plate (21); the circulation pipeline ( 3) comprising three independent circulation pipelines for wastewater, alkali solution and acid solution; 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 treated in the positive electrode chamber (13) and the negative electrode chamber (20), and alkali liquid only enters the alkali liquid circulation pipeline (9) and is treated in the alkali liquid chamber (16); The acid liquid only enters the acid liquid circulation pipeline (12) and is processed in the acid liquid chamber (18).

2. A microfluidic multi-membrane stacked electrolysis device for treating high-salt organic wastewater according to claim 1, characterized in that: The positive electrode plate (13) is a corrosion-resistant anode, and the negative 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 (13) is filled with a porous adsorption material (22) to form a microfluidic reaction environment, and the particle size of the porous 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 source (2) is a DC power source, 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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