Pollutant degradation electrolytic bath

Abstract

The invention discloses a pollutant degradation electrolytic bath, and belongs to the technical field of wastewater treatment.The pollutant degradation electrolytic bath comprises an electrolytic bath body internally provided with a degradation chamber, the electrolytic bath body is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are both communicated with the degradation chamber, and an electrode assembly is arranged in the degradation chamber; the electrode assembly comprises cathode pieces and anode pieces which are arranged at intervals, the cathode pieces and the anode pieces are alternately arranged in a staggered mode so as to divide the degradation cavity into continuous bent flow channels, the liquid inlet ends of the bent flow channels are communicated with the liquid inlet, and the liquid outlet ends of the bent flow channels are communicated with the liquid outlet. The cathode plates and the anode plates are arranged in a staggered and spaced mode, a continuous bent flow channel is formed in the electrolysis cavity, electric field distribution can be optimized, wastewater can flow in one direction, it is ensured that the wastewater can make full contact with an electrode area, uniform electrolytic reaction occurs, unelectrolyzed parts are avoided, the pollutant degradation rate is increased, and the flowing path is relatively prolonged; and sufficient electrolysis of pollutants in the wastewater is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, in particular to a pollutant degradation electrolytic cell. Background Art

[0002] The Electrochemical Advanced Oxidation Process (EAOP) is a highly efficient technology for treating organic pollutants. It primarily degrades refractory organic matter by generating highly oxidizing ·OH (hydroxyl radicals) through electrode reactions. Boron-doped diamond (BDD) anodes are considered one of the most promising electrode materials due to their high overpotential, strong corrosion resistance, and strong oxidation capacity, and are widely used in the treatment of high-concentration organic wastewater. However, in practical applications, traditional BDD anode electrolyzers still suffer from some key technical bottlenecks, such as uneven fluid flow, incomplete pollutant degradation, bubble shielding effects on the electrode surface, and difficulty in maintaining the electrode structure. These issues have limited the further promotion of EAOP technology in industrial applications.

[0003] Electrolytic cells are mainly divided into flat-plate electrolytic cells and bubbling electrolytic cells. Flat-plate electrolytic cells are usually rectangular or cylindrical structures with multiple electrode assemblies inside. Each electrode assembly includes two parallel anode sheets (BDD) and cathode sheets (usually titanium-based coating or stainless steel). The spacing between the anode sheets and cathode sheets is fixed. The electrode sheets of multiple electrode assemblies are parallel to each other. The electrode sheets are directly inserted into the bracket or fastening device. The fluid usually enters from the bottom of the electrolytic cell and is discharged from the top. Mass transfer is carried out by natural convection of the liquid flow. The cover of the electrolytic cell is usually a closed design with gas discharge holes to reduce gas accumulation. The bubbling electrolytic cell is based on the flat-plate electrolytic cell. An air or oxygen bubbling device is added under the electrode sheet. Micro-nano bubbles are used to stir the wastewater, reducing fluid short-circuiting to improve the mass transfer efficiency of pollutants and promote the mixing and oxidation reaction of wastewater.

[0004] However, whether it is a flat-plate electrolytic cell or a bubbling electrolytic cell, the current electrode assemblies are mainly installed in the middle of the electrolytic cell or on the two side walls of the electrolytic cell. Because the wastewater will preferentially flow along the path with the least resistance when flowing between the electrodes, after the wastewater enters the electrolytic cell, when the electrode plate is located in the middle of the electrolytic cell, part of the wastewater will flow directly through the gap between the electrode plate and the side wall of the electrolytic cell, and when the electrode plate is located on the two side walls of the electrolytic cell, part of the wastewater will flow directly through the gap between the electrode plates on the two side walls, resulting in some pollutants being discharged without fully contacting the electrode sheets, resulting in insufficient degradation rate of pollutants. Summary of the Invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems and provide a pollutant degradation electrolytic cell, in which cathode plates and anode plates are arranged in an alternating and spaced manner to form a continuous curved flow channel in the electrolysis chamber, which can optimize the electric field distribution, make the wastewater flow in one direction, ensure that the wastewater can fully contact the electrode area, and produce a uniform electrolysis reaction, avoid the existence of unelectrolyzed parts, improve the pollutant degradation rate, and relatively extend the flow path to ensure that the pollutants in the wastewater are fully electrolyzed.

[0006] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention discloses a pollutant degradation electrolytic cell, comprising an electrolytic cell body with a degradation chamber therein, the electrolytic cell body being provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet being both connected to the degradation chamber, an electrode assembly being provided in the degradation chamber, the electrode assembly comprising cathode sheets and anode sheets arranged at intervals, the cathode sheets and the anode sheets being arranged alternately and staggered to divide the degradation chamber into continuous meandering flow channels, the liquid inlet end of the meandering flow channel being connected to the liquid inlet, and the liquid outlet end of the meandering flow channel being connected to the liquid outlet.

[0007] Preferably, a porous spoiler is provided between the liquid inlet end of the bent flow channel and the liquid inlet, and between the liquid outlet end of the bent flow channel and the liquid outlet.

[0008] Preferably, the holes on the porous spoiler are hexagonal holes.

[0009] Preferably, the degradation chamber is a rectangular chamber, the cathode sheet and the anode sheet are parallel to the short side walls of the rectangular chamber, the cathode sheet and the anode sheet are respectively installed on the two long side walls of the rectangular chamber, the liquid inlet and the liquid outlet are located on the same long side wall of the rectangular chamber, the liquid inlet and the liquid outlet are located at both ends of the same diagonal line, and the liquid inlet is located below the liquid outlet.

[0010] Preferably, the corners between the other long side wall and the two short side walls of the rectangular chamber are rounded.

[0011] Preferably, the electrolytic cell body includes a rectangular box body and a rectangular cover plate, a maintenance port is provided on the top of the rectangular box body, the rectangular cover plate is detachably connected to the maintenance port, an anode extension port and a cathode extension port are provided on the rectangular cover plate, the connection terminal of the anode plate extends out of the anode extension port, and the connection terminal of the cathode plate extends out of the cathode extension port.

[0012] Preferably, a metal clamp for clamping the connection terminal of the anode sheet is provided on the rectangular cover plate, a first connection hole for electrical connection is provided on the metal clamp, and a second connection hole for electrical connection is provided on the connection terminal of the cathode sheet.

[0013] Preferably, an anode embedding groove and a cathode embedding groove are respectively provided on the two long side walls of the rectangular box body, one end of the cathode sheet is embedded in the cathode embedding groove, and the other end of the cathode sheet is spaced apart from the long side wall provided with the anode embedding groove, and one end of the anode sheet is embedded in the anode embedding groove, and the other end of the anode sheet is spaced apart from the long side wall provided with the cathode embedding groove.

[0014] Preferably, an exhaust port is provided on the rectangular cover plate, and the exhaust port is communicated with the bent flow channel.

[0015] Preferably, the anode sheet is a BDD anode sheet, and the metal fixture is a Ti metal fixture.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] In the present invention, cathode sheets and anode sheets are arranged in an electrolysis chamber of the electrolytic cell in a staggered and spaced manner to form a continuous curved flow channel in the electrolysis chamber. This not only optimizes the electric field distribution, allows wastewater to flow in one direction, ensures that the wastewater can fully contact the electrode area, and produces a uniform electrolysis reaction, avoids the existence of unelectrolyzed parts, and improves the degradation rate of pollutants, but also can extend the flow path compared to a straight flow channel, ensuring that the pollutants in the wastewater are fully electrolyzed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 the analysis of these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the pollutant degradation electrolytic cell in an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the front view of the pollutant degradation electrolytic cell in an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the top view of the pollutant degradation electrolytic cell in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the three-dimensional structure of the pollutant degradation electrolytic cell (without metal fixtures) in an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the internal three-dimensional structure of the pollutant degradation electrolytic cell in an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the internal top view of the pollutant degradation electrolytic cell (including multiple anode embedded tanks and cathode embedded tanks) in an embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the cross-sectional three-dimensional structure of a pollutant degradation electrolytic cell in an embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the cross-section of the pollutant degradation electrolytic cell in an embodiment of the present invention;

[0027] Figure 9 Schematic diagram of wastewater flow direction in an embodiment of the present invention.

[0028] Explanation of the accompanying symbols: 1. Rectangular box body; 2. Rectangular cover; 3. Degradation chamber; 4. Liquid inlet; 5. Liquid outlet; 6. Exhaust port; 7. Cathode plate; 8. Anode plate; 9. Porous spoiler; 10. Metal clamp; 11. First connecting hole; 12. Second connecting hole; 13. Rounded corner; 14. Anode mounting groove; 15. Cathode mounting groove; 16. Hexagonal hole; 17. Bend flow channel. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] The purpose of the present invention is to provide a pollutant degradation electrolytic cell to solve the problems existing in the prior art. The cathode plates and the anode plates are arranged in an interlaced and spaced manner in the electrolytic cell to form a continuous curved flow channel in the electrolysis chamber. This can not only optimize the electric field distribution and make the wastewater flow in one direction, ensuring that the wastewater can fully contact the electrode area, causing a uniform electrolysis reaction, avoiding the existence of unelectrolyzed parts, and improving the pollutant degradation rate, but also relatively extend the flow path to ensure that the pollutants in the wastewater are fully electrolyzed.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 9As shown, this embodiment provides a pollutant degradation electrolytic cell, comprising an electrolytic cell body, a degradation chamber 3 disposed therein, and a liquid inlet 4 and a liquid outlet 5 disposed therein, both of which are in communication with the degradation chamber 3. An electrode assembly is disposed within the degradation chamber 3, comprising cathode plates 7 and anode plates 8. The cathode plates 7 and anode plates 8 are arranged alternately and staggered within the degradation chamber 3, with spacing between adjacent cathode plates 7 and anode plates 8 to divide the degradation chamber 3 into a continuous, curved channel 17, which resembles a continuous S-shape. The number of cathode plates 7 and anode plates 8 is determined as needed, with no specific limitation. For example, three cathode plates 7 and two anode plates 8 may be provided, or three cathode plates 7 and three anode plates 8 may be provided. The liquid inlet of the curved channel 17 is in communication with the liquid inlet 4, and the liquid outlet of the curved channel 17 is in communication with the liquid outlet 5. Wastewater flows in from the liquid inlet 4, passes through the curved flow channel 17, and then flows out from the liquid outlet 5. When passing through the curved flow channel 17, the pollutants in the wastewater are electrolyzed by the cathode plate 7 and the anode plate 8. The cathode plate 7 and the anode plate 8 form a curved flow channel 17, which can optimize the electric field distribution and make the wastewater flow in one direction, so as to ensure that the wastewater can flow evenly through the entire electrode area according to the set path, fully contact the cathode plate 7 and the anode plate 8, and then undergo a uniform electrolysis reaction, avoiding the existence of unelectrolyzed parts and improving the degradation rate of pollutants. In addition, the curved flow channel 17 can extend the flow path relative to the straight flow channel to ensure sufficient electrolysis. Preferably, the cathode plate 7 and the anode plate 8 are parallel to each other.

[0033] In one embodiment, a porous spoiler 9 is provided between the liquid inlet end and the liquid inlet 4 of the curved flow channel 17, and a porous spoiler 9 is also provided between the liquid outlet end and the liquid outlet 5 of the curved flow channel 17. After the porous spoiler 9 enters the degradation chamber 3, the porous spoiler 9 disrupts the flow, thereby: firstly, it helps to enhance the mixing effect of the fluid, so that the pollutants contact the anode sheet 8 more evenly, thereby increasing the oxidative degradation rate; secondly, it can fully diffuse the wastewater, preventing the wastewater from flowing directly through the gaps between some electrode sheets and then being quickly discharged, thereby ensuring uniform distribution of the fluid and improving reaction efficiency; thirdly, it can evenly distribute the fluid flow rate, reduce short-circuit flow, and increase the contact time between the pollutants and the electrodes.

[0034] In one embodiment, the holes on the porous spoiler 9 are hexagonal holes 16. The hexagonal holes 16 are Figure 5 、 Figure 7 as well as Figure 8 This arrangement is a matrix arrangement, and can also be a honeycomb arrangement (not shown). Compared with random hole or circular hole arrangement, the honeycomb array has a higher open porosity, which helps to distribute the fluid smoothly and reduce flow resistance.

[0035] In one embodiment, the degradation chamber 3 is a rectangular chamber, with the cathode plate 7 and anode plate 8 parallel to the short sidewalls of the rectangular chamber. The cathode plate 7 and anode plate 8 are mounted on the two long sidewalls of the rectangular chamber, respectively. The liquid inlet 4 and liquid outlet 5 are located on the same long sidewall of the rectangular chamber, at opposite ends of the same diagonal line, with the liquid inlet 4 below the liquid outlet 5. This design extends the fluid path and prevents premature outflow of unreacted contaminants.

[0036] In one embodiment, the corners between the other long sidewall of the rectangular chamber (degradation chamber 3) (the long sidewall opposite the long sidewall with the liquid inlet 4) and the two short sidewalls are rounded. During unidirectional wastewater flow, the corners between the long sidewall opposite the long sidewall with the liquid inlet 4 and the two short sidewalls are critical points of fluid turning. Rounding the corners 13, forming arc-shaped surfaces, facilitates flow diversion, reduces dead zones, prevents contaminants from accumulating in corners, and improves mass transfer efficiency.

[0037] In one embodiment, the arc of the rounded corner 13 is a quarter of a circle.

[0038] In one embodiment, the electrolytic cell body includes a rectangular box body 1 and a rectangular cover plate 2. A maintenance port is provided on the top of the rectangular box body 1. The rectangular cover plate 2 is detachably connected to the maintenance port. The degradation chamber 3 is located inside the rectangular box body 1. After the rectangular cover plate 2 covers the maintenance port, the degradation chamber 3 can be sealed. The rectangular cover plate 2 is detachably connected, making it convenient to open the maintenance port for repairing and replacing the cathode plate 7 and the anode plate 8. The rectangular cover plate 2 is provided with an anode extension port and a cathode extension port. The connection terminal of the anode plate 8 extends out of the anode extension port for connection to the positive pole of an external power supply. The connection terminal of the cathode plate 7 extends out of the cathode extension port for connection to the negative pole of an external power supply. On the one hand, the rectangular cover plate 2 can shield the maintenance port, and on the other hand, it can fix the anode plate 8 and the cathode plate 7 to ensure that the anode plate 8 and the cathode plate 7 will not loosen due to fluid erosion during the electrolysis process.

[0039] In one embodiment, a metal clamp 10 is provided on the rectangular cover plate 2. The metal clamp 10 is used to clamp the connection terminal of each anode plate 8. The metal clamp 10 has a first connection hole 11 for electrical connection, which is connected to the positive lead of an external power source through the first connection hole 11. The connection terminal of the cathode plate 7 has a second connection hole 12 for electrical connection, which is connected to the negative lead of the external power source through the second connection hole 12. Wiring through the first and second connection holes 11, 12 ensures a stable electrical connection and prevents increased contact resistance and energy consumption.

[0040] In one embodiment, the rectangular box body 1 (degradation chamber 3) is provided with an anode mounting slot 14 and a cathode mounting slot 15 on each of its long side walls. One end of the cathode sheet 7 is mounted within the cathode mounting slot 15, with the other end of the cathode sheet 7 spaced from the long side wall where the anode mounting slot 14 is located to facilitate wastewater flow. One end of the anode sheet 8 is mounted within the anode mounting slot 14, with the other end of the anode sheet 8 spaced from the long side wall where the cathode mounting slot 15 is located to facilitate wastewater flow. The arrangement of the anode mounting slots 14 and cathode mounting slots 15 enables plug-in fixing of the anode sheet 8 and cathode sheet 7, facilitating replacement while ensuring a stable spacing and enhancing long-term operational stability. The number of anode mounting slots 14 can be equal to or greater than the number of anode sheets 8. If there are more anode sheets than 8, the spacing between the multiple anode mounting slots 14 can be pre-set to a uniform value. By selecting different anode mounting slots 14 and inserting the anode sheets 8, the spacing between the anode sheets 8 can be varied. The number of cathode mounting slots 15 is equal to or greater than the number of cathode sheets 7. When there are more cathode sheets than cathode sheets 7, the spacing between the multiple cathode mounting slots 15 can be pre-set to a uniform value. By selecting different cathode mounting slots 15 and inserting them into the cathode sheets 7, the spacing between the cathode sheets 7 can be changed. By comprehensively selecting the anode mounting slots 14 and cathode mounting slots 15, the spacing between the cathode sheets 7 and 8 can be changed. Adjusting this as needed can avoid local current density being too high or too low, which can lead to strong oxidation capacity in some areas and insufficient oxidation capacity in other areas, thereby reducing overall degradation efficiency.

[0041] In one embodiment, the anode embedding groove 14 and the cathode embedding groove 15 both extend to the bottom wall of the rectangular box body 1 (degradation chamber 3), so that the bottom of the cathode sheet 7 is inserted into the cathode embedding groove 15 on the bottom wall of the rectangular box body 1 (degradation chamber 3), and the bottom of the anode sheet 8 is inserted into the anode embedding groove 14 on the bottom wall of the rectangular box body 1 (degradation chamber 3) to ensure the sealing between the bottom of the cathode sheet 7 and the anode sheet 8 and the bottom wall of the rectangular box body 1 (degradation chamber 3).

[0042] In one embodiment, an exhaust port 6 is provided on the rectangular cover plate 2, and the exhaust port 6 is connected to the curved flow channel 17 for discharging gases generated during the electrolysis process, such as oxygen, hydrogen and ozone, to reduce the bubble shielding effect, avoid gas accumulation affecting the electrolysis effect, and ensure the surface reaction activity of the electrode sheet.

[0043] In one embodiment, anode plate 8 is made of boron-doped diamond (BDD), which has a high oxygen evolution overpotential and improves the efficiency of hydroxyl radical (·OH) generation. Metal fixture 10 is made of Ti. Cathode plate 7 is made of a metal material such as Ti or stainless steel, which facilitates electron transport during the electrolysis reaction.

[0044] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A pollutant degradation electrolytic cell, characterized in that: The invention comprises an electrolytic cell body with a degradation chamber provided therein, wherein the electrolytic cell body is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are both communicated with the degradation chamber, wherein an electrode assembly is provided in the degradation chamber, wherein the electrode assembly comprises cathode sheets and anode sheets arranged at intervals, wherein the cathode sheets and the anode sheets are arranged alternately and staggered to divide the degradation chamber into a continuous meandering flow channel, wherein the liquid inlet end of the meandering flow channel is communicated with the liquid inlet, and the liquid outlet end of the meandering flow channel is communicated with the liquid outlet.

2. The pollutant degradation electrolytic cell according to claim 1, characterized in that: A porous spoiler is provided between the liquid inlet end of the bent flow channel and the liquid inlet, and between the liquid outlet end of the bent flow channel and the liquid outlet.

3. The pollutant degradation electrolytic cell according to claim 2, characterized in that: The holes on the porous spoiler are hexagonal holes.

4. The pollutant degradation electrolytic cell according to claim 1, characterized in that: The degradation chamber is a rectangular chamber, the cathode sheet and the anode sheet are parallel to the short side walls of the rectangular chamber, the cathode sheet and the anode sheet are respectively installed on the two long side walls of the rectangular chamber, the liquid inlet and the liquid outlet are located on the same long side wall of the rectangular chamber, the liquid inlet and the liquid outlet are located at both ends of the same diagonal line, and the liquid inlet is located below the liquid outlet.

5. The pollutant degradation electrolytic cell according to claim 4, characterized in that: The corners between the other long side wall and the two short side walls of the rectangular chamber are rounded.

6. The pollutant degradation electrolytic cell according to claim 4 or 5, characterized in that: The electrolytic cell body includes a rectangular box body and a rectangular cover plate. A maintenance port is provided on the top of the rectangular box body. The rectangular cover plate is detachably connected to the maintenance port. An anode extension port and a cathode extension port are provided on the rectangular cover plate. The connection terminal of the anode plate extends out of the anode extension port, and the connection terminal of the cathode plate extends out of the cathode extension port.

7. The pollutant degradation electrolytic cell according to claim 6, characterized in that: The rectangular cover is provided with a metal clamp for clamping the connection terminal of the anode sheet. The metal clamp is provided with a first connection hole for electrical connection. The connection terminal of the cathode sheet is provided with a second connection hole for electrical connection.

8. The pollutant degradation electrolytic cell according to claim 6, characterized in that: An anode embedding groove and a cathode embedding groove are respectively provided on the two long side walls of the rectangular box body. One end of the cathode sheet is embedded in the cathode embedding groove, and the other end of the cathode sheet is spaced apart from the long side wall with the anode embedding groove. One end of the anode sheet is embedded in the anode embedding groove, and the other end of the anode sheet is spaced apart from the long side wall with the cathode embedding groove.

9. The pollutant degradation electrolytic cell according to claim 6, characterized in that: An exhaust port is provided on the rectangular cover plate, and the exhaust port is communicated with the bent flow channel.

10. The pollutant degradation electrolytic cell according to claim 7, characterized in that: The anode sheet is a BDD anode sheet, and the metal fixture is a Ti metal fixture.

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