An electrolysis device for treating wastewater containing perfluorinated compounds

Abstract

The utility model provides an electrolysis device for treating wastewater containing perfluorinated compounds, including an electrolytic cell, wherein a bipolar plate is arranged in the electrolytic cell, wherein the bipolar plate divides the electrolytic cell into an anode chamber and a cathode chamber, wherein an anode is arranged in the anode chamber, wherein a cathode is arranged in the cathode chamber, wherein the anode and the cathode are respectively located on both sides of the bipolar plate and independently connected to the bipolar plate, wherein the anode and the cathode form an electric circuit through a power supply, wherein a pH adjustment component is also arranged between the anode and the cathode for adjusting the acidity and alkalinity in the anode chamber and the cathode chamber respectively, wherein a circulating water inlet is provided in the cathode chamber, wherein a filter component is provided in the circulating water inlet, wherein a circulating water outlet is provided in the anode chamber, wherein an external circulating water outlet is connected to the circulating water outlet. The utility model has high PFCs removal efficiency, low energy consumption, and high stability and adaptability.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment and relates to an electrolysis device for treating waste water containing perfluorinated compounds. Background Art

[0002] Perfluorinated compounds (PFCs) are a class of synthetic organic fluorine compounds with excellent physical and chemical properties, and are widely used in industrial production and daily life. However, PFCs are also a new type of persistent organic pollutants that are seriously harmful to the environment and human health. Traditional wastewater treatment technologies, such as adsorption and membrane separation, are difficult to effectively remove PFCs from water.

[0003] Electrolysis has gained more and more attention and application in the field of water treatment due to its advantages such as high efficiency and environmental protection. CN216712260U discloses an electrolytic cell having two electrodes, namely an anode and a cathode; a proton conducting membrane as a dielectric disposed between the two electrodes, two bipolar plates, the bipolar plates being designed for electrically contacting the electrolytic cell; and a medium supply device for water, wherein the electrolytic cell is also designed for: temperature adjustment by means of a temperature adjustment device, and temperature adjustment according to a temperature adjustment section and / or temperature adjustment plate disposed next to the anode and / or cathode. CN202508902U discloses an integrated oxygen cathode electrolytic catalytic oxidation sewage treatment device, comprising an oxygen cathode electrolytic catalytic oxidation tank, a DC power supply, an anode, and a cathode, wherein the oxygen cathode electrolytic catalytic oxidation tank contains an electrolyte, and a water outlet is provided at the top, wherein the anode is connected to the positive pole of the DC power supply, and the cathode is connected to the negative pole of the DC power supply, wherein the anode is a DSA anode and the cathode is a stainless steel cathode, catalyst particles are suspended in the electrolyte, and a filter is provided at the water outlet to decompose organic pollutants in the wastewater.

[0004] However, the existing electrolysis devices have the problems of high energy consumption, easy electrode passivation, poor adaptability, etc., which limit their application in PFCs removal. Therefore, it is necessary to provide an energy-saving and efficient electrolysis device for treating PFCs-containing wastewater. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an electrolysis device for treating wastewater containing perfluorinated compounds, which can simultaneously achieve reduction and oxidation reactions of the wastewater, has high PFCs removal efficiency, low energy consumption, and high stability and adaptability.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides an electrolysis device for treating wastewater containing perfluorinated compounds. The electrolysis device comprises an electrolytic cell, wherein a bipolar plate is arranged in the electrolytic cell, wherein the bipolar plate divides the electrolytic cell into an anode chamber and a cathode chamber, wherein an anode is arranged in the anode chamber, wherein a cathode is arranged in the cathode chamber, wherein the anode and the cathode are respectively located on both sides of the bipolar plate and independently connected to the bipolar plate, wherein the anode and the cathode form an electric circuit through a power supply, wherein a pH regulating component is further arranged between the anode and the cathode for regulating the acidity and alkalinity in the anode chamber and the cathode chamber respectively, wherein a circulating water inlet is provided in the cathode chamber, wherein a filtering component is provided in the circulating water inlet, wherein a circulating water outlet is provided in the anode chamber, wherein an external circulating pump is connected to the circulating water outlet.

[0008] The anode and cathode of the electrolysis device in the utility model are respectively located in the anode chamber and the cathode chamber, and an electric circuit is formed by a power supply to provide the current required for electrolyzing wastewater. The bipolar plate is located between the anode chamber and the cathode chamber, and is used to conduct electrolyte, form good electrical contact and current conduction, and allow effective flow and mass transfer of electrolyte, while avoiding excessive resistance loss. The perfluorinated compound-containing wastewater entering the electrolytic cell is pre-treated by a filtering component to remove suspended matter and macromolecular impurities in the wastewater, which is beneficial to improving the electrolysis effect. At the same time, an external circulation pump is connected to the circulation outlet to extract the treated water in the electrolytic cell, which speeds up the water circulation in the electrolytic cell so that it can be transported to a subsequent treatment unit or directly discharged. The pH value of the electrolyte is adjusted by a pH adjustment component arranged between the anode chamber and the cathode chamber to keep it within the optimal electrolysis range, thereby improving the PFCs removal efficiency and making the treated water quality meet the discharge standard.

[0009] As a preferred technical solution of the utility model, the cathode includes a first electrode and a catalytic coating arranged on the surface of the first electrode, and the first electrode has a porous structure.

[0010] The anode includes a second electrode and an oxide coating disposed on a surface of the second electrode.

[0011] As a preferred technical solution of the utility model, the first electrode is a titanium-based porous electrode, and the catalytic coating is a mixed coating of platinum and ruthenium dioxide.

[0012] It should be noted that the mixed coating of platinum and ruthenium dioxide described in the present invention adopts known materials commonly used by those skilled in the art, and can be prepared by the electrodeposition method, sol-gel method or thermal decomposition method commonly used in the art.

[0013] The second electrode comprises a titanium-based electrode, and the oxide coating is an iridium-tantalum oxide coating.

[0014] It should be noted that the iridium-tantalum oxide coating of the present invention is a commercially available material commonly used by those skilled in the art.

[0015] As a preferred technical solution of the present invention, the thickness of the catalytic coating is 50 to 200 nm, for example, it can be 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, 120 nm, 140 nm, 150 nm, 160 nm, 180 nm or 200 nm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] The thickness of the oxide coating is 200-800 nm, for example, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, 600 nm, 650 nm, 700 nm, 750 nm or 800 nm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0017] The utility model adopts a porous electrode coated with a rare metal oxide catalytic coating in the cathode, and an electrode coated with a metal oxide coating in the anode, which improves the electrolysis efficiency, reduces the electrolysis energy consumption, and prolongs the electrode life.

[0018] As a preferred technical solution of the utility model, the bipolar plate and the cathode are connected by conductive bolts.

[0019] As a preferred technical solution of the utility model, the bipolar plate and the anode are connected via a conductive retaining spring.

[0020] It should be noted that the bipolar plate and the cathode described in the utility model are connected by conductive bolts, and the bipolar plate and the anode are connected by conductive retaining springs, ensuring that the gap width between the bipolar plate and the cathode is 2 to 4 mm, and the gap width between the bipolar plate and the anode is 2 to 4 mm, which can not only ensure good electrical contact and current conduction, but also avoid excessive resistance loss.

[0021] As a preferred technical solution of the utility model, the filter assembly includes at least one layer of filter membrane.

[0022] The utility model uses at least one side of the filter membrane to pre-filter suspended matter and macromolecular impurities in the wastewater to avoid adverse effects on the electrolysis of the wastewater. The utility model does not specifically limit the type of filter membrane, and those skilled in the art can adjust it according to the properties of the wastewater.

[0023] As a preferred technical solution of the utility model, the circulating water inlet is provided with a water inlet pipe, and the water inlet pipe is used to inject perfluorinated compound-containing wastewater into the cathode chamber. The circulating water outlet is provided with a water outlet pipe, and the water outlet pipe is used to discharge the wastewater in the anode chamber. The water outlet pipe is connected to the external circulation pump.

[0024] As a preferred technical solution of the utility model, the electrolysis device also includes a wastewater storage tank and a clean water storage tank, the wastewater storage tank is connected to the water inlet pipe, and the clean water storage tank is connected to the external circulation pump.

[0025] In the utility model, during the electrolysis process, wastewater containing perfluorinated compounds enters the cathode chamber, a reduction reaction occurs on the cathode surface, fluorine ions are generated and precipitated, and after the wastewater enters the anode chamber, an oxidation reaction occurs on the anode surface, the organic molecular chain breaks, carbon dioxide and water are generated, and discharged from the circulating water outlet. In order to improve the quality of the drainage water, the circulating water outlet can be provided with a gas-liquid separation component to separate the carbon dioxide and water generated in the anode chamber. The utility model does not specifically limit the structure of the gas-liquid separation component, and any gas-liquid separation component that can separate carbon dioxide from water can be applied to the utility model.

[0026] As a preferred technical solution of the utility model, the pH adjustment component includes a first pH sensor and a second pH sensor respectively located in the anode chamber and the cathode chamber, for respectively detecting the pH values ​​in the anode chamber and the cathode chamber.

[0027] During the wastewater electrolysis process, the anode chamber is filled with an anolyte, and the cathode chamber is filled with a cathode electrolyte. The first pH sensor and the second pH sensor are used to obtain the pH values ​​of the electrolytes in the anode chamber and the cathode chamber in real time, and the pH values ​​of the electrolytes are adjusted according to the detection values.

[0028] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0029] The system refers to an equipment system, a device system or a production device.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] The utility model provides an electrolysis device for treating wastewater containing perfluorinated compounds, which has a compact structure, a reasonable layout, is easy to manufacture, install and maintain, and is highly practical, improves the wastewater electrolysis efficiency, reduces energy consumption, and prolongs the life of the electrode; and the electrolysis process can simultaneously realize reduction reaction and oxidation reaction, has a high PFCs removal efficiency, and the treated water quality meets the discharge standard; by introducing pre-filtration and pH adjustment, the PFCs removal performance and the adaptability of the device are improved, and the optimized control of the electrolysis process is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of an electrolysis device for treating wastewater containing perfluorinated compounds provided in an embodiment of the utility model.

[0033] Among them, 1-electrolyzer; 2-cathode chamber; 3-anode chamber; 4-cathode; 5-anode; 6-bipolar plate; 7-water inlet; 8-water outlet; 9-power supply; 10-filter component; 11-external circulation pump; 12-pH adjustment component; 13-wastewater storage tank. DETAILED DESCRIPTION

[0034] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0035] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not constitute the main innovation of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements or specific limitations on this.

[0037] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0038] In a specific embodiment, the utility model provides an electrolysis device for treating wastewater containing perfluorinated compounds, including an electrolytic cell, wherein a bipolar plate is arranged in the electrolytic cell, and the bipolar plate divides the electrolytic cell into an anode chamber and a cathode chamber, wherein an anode is arranged in the anode chamber, and a cathode is arranged in the cathode chamber, wherein the anode and the cathode are respectively located on both sides of the bipolar plate and are independently connected to the bipolar plate, wherein the anode and the cathode form an electrical circuit through a power supply, and a pH adjustment component is further arranged between the anode and the cathode for adjusting the acidity and alkalinity in the anode chamber and the cathode chamber respectively, wherein a circulating water inlet is provided in the cathode chamber, wherein a filtering component is provided in the circulating water inlet, and wherein a circulating water outlet is provided in the anode chamber, wherein the circulating water outlet is connected to an external circulating pump. The anode and cathode of the electrolysis device are respectively located in the anode chamber and the cathode chamber, and an electric circuit is formed by a power supply to provide the current required for electrolysis of wastewater, and the bipolar plate conducts electrolytes; the perfluorinated compound-containing wastewater entering the electrolytic cell is pre-treated by a filtering component to remove suspended matter and macromolecular impurities in the wastewater, which is beneficial to improving the electrolysis effect; at the same time, an external circulation pump is connected to the circulating water outlet to extract the treated water in the electrolytic cell, which speeds up the water circulation in the electrolytic cell so that it can be transported to a subsequent treatment unit or directly discharged; the pH value of the electrolyte is adjusted by a pH adjustment component arranged between the anode chamber and the cathode chamber to keep it within the optimal electrolysis range, thereby improving the PFCs removal efficiency and ensuring that the treated water quality meets the discharge standard.

[0039] In some embodiments, the cathode includes a first electrode and a catalytic coating disposed on a surface of the first electrode, the first electrode having a porous structure, and the anode includes a second electrode and an oxide coating disposed on a surface of the second electrode.

[0040] Specifically, the first electrode is a titanium-based porous electrode, and the catalytic coating is a mixed coating of platinum and ruthenium dioxide.

[0041] The mixed coating of platinum and ruthenium dioxide is made of known materials commonly used by those skilled in the art, and can be prepared by using the electrodeposition method, sol-gel method or thermal decomposition method commonly used in the art.

[0042] Exemplarily, the specific preparation process of the mixed coating of platinum and ruthenium dioxide includes: immersing the titanium-based porous electrode in an electrolyte containing 2-10 g / L of chloroplatinic acid and 1-5 g / L of ruthenium chloride, and controlling the current density to 10-50 mA / cm 3 , the deposition time is 10 to 60 minutes, and the temperature is 20 to 80°C to form a mixed coating of platinum and ruthenium dioxide. After the electrodeposition is completed, the coating is heat treated at 400 to 800°C for 1 to 5 hours to improve its stability and catalytic activity. Those skilled in the art can appropriately adjust and optimize the above preparation conditions and parameters according to actual needs.

[0043] Specifically, the second electrode includes a titanium-based electrode, and the oxide coating is an iridium-tantalum oxide coating. The iridium-tantalum oxide coating is made of commercially available materials commonly used by those skilled in the art.

[0044] In the utility model, the cathode adopts a porous electrode coated with a rare metal oxide catalytic coating, and the anode adopts an electrode coated with a metal oxide coating, which improves the electrolysis efficiency, reduces the electrolysis energy consumption, and prolongs the electrode life.

[0045] In some embodiments, the thickness of the catalytic coating is 50 to 200 nm, and the thickness of the oxide coating is 200 to 800 nm. In some embodiments, the bipolar plate is connected to the cathode by a conductive bolt; the bipolar plate is connected to the anode by a conductive spring to ensure that the gap width between the bipolar plate and the cathode is 2 to 4 mm, and the gap width between the bipolar plate and the anode is 2 to 4 mm, which can not only ensure good electrical contact and current conduction, but also avoid excessive resistance loss.

[0046] In some embodiments, the filtration component includes at least one layer of filtration membrane to pre-filter suspended matter and macromolecular impurities in the wastewater to avoid adverse effects on wastewater electrolysis.

[0047] In some embodiments, the circulating water inlet is provided with a water inlet pipe, the water inlet pipe is used to inject perfluorinated compound-containing wastewater into the cathode chamber, the circulating water outlet is provided with a water outlet pipe, the water outlet pipe is used to discharge the wastewater in the anode chamber, and the water outlet pipe is connected to the external circulating pump. The electrolysis device also includes a wastewater storage tank and a clean water storage tank, the wastewater storage tank is connected to the water inlet pipe, and the clean water storage tank is connected to the external circulating pump.

[0048] In some embodiments, the pH adjustment component includes a first pH sensor and a second pH sensor respectively located in the anode chamber and the cathode chamber, for detecting the pH values ​​in the anode chamber and the cathode chamber respectively. The anode chamber is filled with an anolyte, and the cathode chamber is filled with a catholyte. The first pH sensor and the second pH sensor are used to obtain the pH values ​​of the electrolytes in the anode chamber and the cathode chamber in real time, and the pH values ​​of the electrolytes are adjusted according to the detected values ​​to keep them within the optimal range at all times.

[0049] In some embodiments, the circulating water outlet is further provided with a gas-liquid separation component. During the application process, the wastewater containing perfluorinated compounds enters the cathode chamber, a reduction reaction occurs on the cathode surface, fluoride ions are generated and precipitated, and after the wastewater enters the anode chamber, an oxidation reaction occurs on the anode surface, the organic molecular chain breaks, carbon dioxide and water are generated, and discharged from the circulating water outlet, and the separation of carbon dioxide and water can be achieved through the gas-liquid separation component.

[0050] The specific working principle of the electrolysis device in the utility model includes:

[0051] (1) After being pre-treated by the filter assembly, the PFC-containing wastewater enters the cathode chamber from the circulating water inlet, where a reduction reaction occurs on the cathode surface, generating fluoride ions that precipitate;

[0052] (2) After the wastewater enters the anode chamber, an oxidation reaction occurs on the anode surface, breaking the molecular chains of organic matter in the wastewater to generate carbon dioxide and water;

[0053] (3) The treated water is discharged from the circulating water outlet;

[0054] (4) During the electrolysis process, an external circulation pump is used to continuously extract water from the anode chamber to accelerate the water circulation in the electrolytic cell, and a pH adjustment component is used to adjust the pH value of the electrolyte based on the detected value so that it is always kept within the optimal range.

[0055] Example

[0056] This embodiment provides an electrolysis device for treating wastewater containing perfluorinated compounds, such as Figure 1 As shown, it includes an electrolytic cell 1, in which a bipolar plate 6 is arranged, and the bipolar plate 6 divides the electrolytic cell 1 into an anode chamber 3 and a cathode chamber 2. An anode 5 is arranged in the anode chamber 3, and a cathode 4 is arranged in the cathode chamber 2. The anode 5 and the cathode 4 form an electrical circuit through a power supply 9. The anode 5 and the cathode 4 are respectively located on both sides of the bipolar plate 6, and the bipolar plate 6 and the cathode 4 are connected by conductive bolts, and the bipolar plate 6 and the anode 5 are connected by conductive springs. The cathode 4 includes a first electrode with a porous structure, and a catalytic coating arranged on the surface of the first electrode, and the anode 5 includes a second electrode, and an oxide coating arranged on the surface of the second electrode.

[0057] The cathode chamber 2 is provided with a circulating water inlet 7, which is provided with a filter assembly 10, and the circulating water inlet 7 is connected to a wastewater storage tank 13 through a water inlet pipe, so as to inject wastewater containing perfluorinated compounds into the cathode chamber 2. The anode chamber 3 is provided with a circulating water outlet 8, which is connected to an external circulating pump 11 through a water outlet pipe, and the external circulating pump 11 is connected to a clean water storage tank.

[0058] A pH adjustment component 12 is also provided between the anode 5 and the cathode 4. The pH adjustment component 12 includes a first pH sensor and a second pH sensor respectively located in the anode chamber 3 and the cathode chamber 2, and is used to respectively detect the pH values ​​in the anode chamber 3 and the cathode chamber 2, and to respectively adjust the pH in the anode chamber 3 and the cathode chamber 2.

[0059] The applicant declares that the above is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. The technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by the technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. An electrolysis device for treating wastewater containing perfluorinated compounds, characterized in that: The electrolysis device includes an electrolytic cell, in which a bipolar plate is arranged, and the bipolar plate divides the electrolytic cell into an anode chamber and a cathode chamber. An anode is arranged in the anode chamber, and a cathode is arranged in the cathode chamber. The anode and the cathode are respectively located on both sides of the bipolar plate and are independently connected to the bipolar plate. The anode and the cathode form an electrical circuit through a power supply. A pH adjustment component is also arranged between the anode and the cathode for adjusting the acidity and alkalinity in the anode chamber and the cathode chamber respectively. The cathode chamber is provided with a circulating water inlet, and the circulating water inlet is provided with a filtering component. The anode chamber is provided with a circulating water outlet, and the circulating water outlet is connected to an external circulating pump.

2. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 1, characterized in that: The cathode includes a first electrode and a catalytic coating disposed on the surface of the first electrode, wherein the first electrode has a porous structure; The anode includes a second electrode and an oxide coating disposed on a surface of the second electrode.

3. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 2, characterized in that: The first electrode is a titanium-based porous electrode, and the catalytic coating is a mixed coating of platinum and ruthenium dioxide; The second electrode comprises a titanium-based electrode, and the oxide coating is an iridium-tantalum oxide coating.

4. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 2, characterized in that: The thickness of the catalytic coating is 50 to 200 nm; The thickness of the oxide coating is 200-800 nm.

5. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 1, characterized in that: The bipolar plate is connected to the cathode via conductive bolts.

6. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 1, characterized in that: The bipolar plate is connected to the anode via a conductive clamping spring.

7. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 1, characterized in that: The filter assembly includes at least one layer of filter membrane.

8. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 1, characterized in that: The circulating water inlet is provided with an inlet pipe, which is used to inject perfluorinated compound-containing wastewater into the cathode chamber. The circulating water outlet is provided with an outlet pipe, which is used to discharge the wastewater in the anode chamber. The outlet pipe is connected to the external circulating pump.

9. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 8, characterized in that: The electrolysis device further comprises a wastewater storage tank and a clean water storage tank, wherein the wastewater storage tank is connected to the water inlet pipe, and the clean water storage tank is connected to the external circulation pump.

10. The electrolysis device for treating wastewater containing perfluorinated compounds according to claim 1, characterized in that: The pH adjustment component includes a first pH sensor and a second pH sensor respectively located in the anode chamber and the cathode chamber, and used for detecting the pH values ​​in the anode chamber and the cathode chamber respectively.

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