A device for treating difficult wastewater by using micro-nano bubble electrochemical method

Abstract

The application discloses a device for treating difficult sewage by a micro-nano bubble electrochemical method and relates to the technical field of sewage treatment.The device comprises an outer protective shell, a water inlet pipe and an exhaust pipe are arranged on the top of the outer protective shell, and a sewage discharge pipe is arranged at the bottom of the outer protective shell; a communication pipe is arranged between a micro-nano bubble generating pool and an electrochemical reaction pool, a dosing tank is fixedly installed at the outer side of the electrochemical reaction pool, the dosing tank is communicated with the communication pipe, a plurality of electrode plates are arranged in the electrochemical reaction pool, the spacing between adjacent electrode plates is adjustable, and high-pressure flushing assemblies are arranged on the two sides of the inner wall of the outer protective shell. The device is characterized in that the setting of a guiding assembly enables the micro-nano bubble generating pool and the electrochemical reaction pool to alternately ascend and descend, enables sewage to alternately enter the micro-nano bubble generating pool and the electrochemical reaction pool, realizes the graded treatment of high-concentration sewage, realizes three-stage treatment, and has good treatment effect on high-concentration sewage.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a device for treating difficult wastewater using a micro-nano bubble electrochemical method. Background Technology

[0002] Combining micro / nano bubble technology with electrochemical water treatment technology can achieve a synergistic effect in the treatment of high-concentration wastewater, further improving treatment efficiency. Electrochemical methods often rely on the participation of oxygen; the introduction of micro / nano bubbles can significantly increase the concentration of dissolved oxygen in water, promoting electrochemical reactions. Micro / nano bubbles can provide a higher gas-liquid interface in electrochemical reactions, increasing the frequency of redox reactions, thus enabling more complete decomposition and removal of harmful substances in high-concentration wastewater.

[0003] Chinese patent (publication number: CN119774827A) discloses an ozone micro-nano bubble-electrochemical-ceramic membrane wastewater treatment device, including a reaction vessel, an ozone generator, a microporous aeration head, a micro-nano bubble reactor, and a catalytic ceramic membrane. The reaction vessel contains an anode, a cathode, a microporous aeration head, and a catalytic ceramic membrane. The anode and cathode are connected to a DC power supply. An outlet pipe is connected above the catalytic ceramic membrane. The micro-nano bubble reactor includes a gas-liquid mixing pump. The inlet of the gas-liquid mixing pump is connected to the wastewater pipe to be treated and the ozone outlet of the ozone generator, respectively, to achieve efficient mixing of wastewater and ozone. The outlet of the gas-liquid mixing pump is connected to the microporous aeration head through a gas-liquid mixing pipe to mix the wastewater and ozone and send it into the reaction vessel.

[0004] The above-mentioned application and existing technology have the following technical problems in actual use:

[0005] 1. The aforementioned applications, like existing technologies, simply combine micro / nano bubble technology with electrochemical water treatment technology. This is effective for treating low-concentration wastewater, but when the wastewater concentration is too high, it often contains large amounts of organic matter, suspended solids, and impurities. These substances may react with the surface of the micro / nano bubbles, causing them to rapidly collapse and reducing their stability in the water. Poor bubble stability affects the contact efficiency between the bubbles and pollutants, thus reducing the effectiveness of subsequent electrochemical reactions. Simultaneously, in high-concentration wastewater, the high concentrations of pollutants and ions accelerate electrode damage, leading to scale buildup or oxide films on the electrode surface, reducing the efficiency of the electrochemical reaction, and potentially even causing system shutdown. Therefore, the current technology combining micro / nano bubbles and electrochemical water treatment presents significant challenges in treating high-concentration wastewater.

[0006] 2. The aforementioned process requires various transfer pumps and complex electrical control systems. These systems typically require substantial amounts of electricity to power sensors, control systems, and automated actuators. In the treatment of high-concentration wastewater, the high viscosity, sediment, and particulate matter content can place significant loads on the pumps and electrical control systems, making them prone to overload and affecting system stability and reliability. The electrical control systems require regular inspection and updates, and the pumps may need more frequent maintenance due to the heavier loads, resulting in higher overall operating costs. Therefore, small-scale wastewater treatment plants face significant challenges and high maintenance costs in the later stages of maintenance. Summary of the Invention

[0007] The purpose of this invention is to provide a device for treating difficult wastewater using a micro-nano bubble electrochemical method to solve the above problems.

[0008] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0009] A device for treating difficult wastewater using a micro-nano bubble electrochemical method includes an outer protective shell, with an inlet pipe and an exhaust pipe at the top of the outer protective shell and a drain pipe at the bottom of the outer protective shell.

[0010] The inner bottom of the outer protective shell is provided with symmetrically distributed guide components on both sides. The guide components consist of a first guide rail and a second guide rail. The first guide rail consists of a vertical part and an arc-shaped flipping part. The second guide rail is arranged correspondingly to the vertical part. The interior of the guide components is provided with a micro-nano bubble generating cell and an electrochemical reaction cell. The micro-nano bubble generating cell is located directly below the water inlet pipe. Two sets of guide posts are provided on both sides of the micro-nano bubble generating cell and the electrochemical reaction cell. The two sets of guide posts are slidably connected in the first guide rail and the second guide rail, respectively. A drain pipe is provided at the bottom of the electrochemical reaction cell.

[0011] A connecting pipe is provided between the micro / nano bubble generating pool and the electrochemical reaction pool. A dosing tank is fixedly installed on the outside of the electrochemical reaction pool and is connected to the connecting pipe. Several electrode plates are provided inside the electrochemical reaction pool, and the spacing between adjacent electrode plates is adjustable. High-pressure flushing components are provided on both sides of the inner wall of the outer protective shell.

[0012] Furthermore, a swinging skid is rotatably mounted inside the outer protective shell. The swinging skid is located inside the guide assembly and below the micro-nano bubble generating cell and the electrochemical reaction cell. A first driving hydraulic cylinder is hinged to the inner bottom of the outer protective shell. Two sets of symmetrically arranged second driving hydraulic cylinders are fixedly mounted on the bottom of the swinging skid. Slide grooves are provided on both sides of the rotation center of the swinging skid. A slide seat is slidably connected inside the slide groove. The slide seat is connected to the telescopic end of the second driving hydraulic cylinder. A telescopic support plate is fixedly mounted on the top of the slide seat. A thrust spring is provided on the inner top of the arc-shaped flipping part.

[0013] Furthermore, the electrode plate is provided with two sets of guide shafts inside, and each guide shaft has a sliding hole at both ends. A telescopic head is slidably connected inside the sliding hole, and a pressure spring is provided between the telescopic head and the inner wall of the sliding hole. Several guide members are provided on both sides of the inner wall of the electrochemical reaction cell. The guide members have annular guide grooves inside, and the telescopic head is inserted into the reversing guide groove. The annular guide groove is composed of an adjusting inclined groove and a reset guide groove. The adjusting inclined groove is designed to be inclined in the opposite direction away from the center of the electrochemical reaction cell, and the inclination angle increases from the inside to the outside. The depth of the adjusting inclined groove decreases from the bottom to the top. When the pressure spring is compressed by one-third, the friction between the telescopic head and the adjusting inclined groove is greater than the weight of the electrode plate.

[0014] Furthermore, the connecting tube consists of fixed tubes at both ends and a telescopic flexible tube in the middle, with the fixed tubes at both ends being fixedly connected to the inner bottom of the micro-nano bubble generating pool and the electrochemical reaction pool, respectively.

[0015] Furthermore, a dosing valve tube is provided at the top of the fixed tube on the electrochemical reaction cell. A T-shaped valve plate is rotatably installed inside the dosing valve tube. A torsion spring is provided at the rotation center of the T-shaped valve plate. The torsion spring is used to drive the T-shaped valve plate to swing to a vertical position. A limiting component is provided on the inner wall of the dosing valve tube. The limiting component restricts the T-shaped valve plate from rotating in the direction of the electrochemical reaction cell. A through hole is opened in the lower half of the T-shaped valve plate. A one-way valve plate is hinged to the through hole on the side of the fixed tube closer to the electrochemical reaction cell. Two sets of arc-shaped sealing components are provided on the inner wall of the dosing valve tube. The two sets of arc-shaped sealing components are located below the upper limiting component and above the lower limiting component, respectively.

[0016] Furthermore, when the T-shaped valve plate is vertical, its bottom end is in sealed contact with the bottom of the fixed tube.

[0017] Furthermore, the micro-nano bubble generating pool is equipped with a micro-nano bubble generator and an ultrasonic generator.

[0018] Furthermore, the high-pressure flushing assembly consists of a high-pressure water plate and several cleaning nozzles, with the high-pressure water plate tilted at an angle of 45°-60°.

[0019] Furthermore, the guiding depth of the vertical part and the second guide rail is greater than the sum of the depths of the micro / nano bubble generating pool and the electrochemical reaction pool.

[0020] Furthermore, both ends of the bottom of the outer protective shell are provided with conical collection hoppers, and the sewage pipe is connected to the conical collection hoppers. The two sets of guide columns on the same side are connected by reinforcing connecting plates.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention, through the setting of a guiding component, allows the micro-nano bubble generator and the electrochemical reaction tank to alternately rise and fall, enabling wastewater to alternately pass through these two tanks, achieving graded treatment of high-concentration wastewater. In the electrochemical reaction tank, wastewater undergoes rapid oxidation and decomposition of pollutants using high current density and a short reaction time, achieving primary treatment. Subsequently, the wastewater enters the micro-nano bubble generator, producing micro-nano bubbles, optimizing bubble stability and gas solubility, and then re-enters the electrochemical reaction tank with a reduced current density to complete the deep treatment of residual pollutants, achieving secondary treatment. Repeating the above steps, using a lower density electrochemical reaction to ensure effective flocculation while avoiding electrode wear and bubble interference, achieves tertiary treatment, resulting in excellent treatment effects for high-concentration wastewater.

[0023] 2. This invention uses a dosing tank to store surfactants, which are automatically added to the micro-nano bubble generator as the micro-nano bubble generator and the electrochemical reaction tank alternately rise and fall. This improves bubble stability and makes the equipment more suitable for treating high-concentration wastewater.

[0024] 3. Through the setting of the guide rail assembly, when the micro-nano bubble generating pool and the electrochemical reaction pool move to the top of the second guide rail, the micro-nano bubble generating pool and the electrochemical reaction pool can rotate around the top of the second guide rail, so that the openings of the micro-nano bubble generating pool and the electrochemical reaction pool face obliquely toward the high-pressure flushing assembly. Therefore, after each stage of reaction, the micro-nano bubble generating pool and the electrochemical reaction pool can be flushed, which can quickly achieve self-cleaning, improve the efficiency of subsequent reactions, and achieve high efficiency in treating high-concentration wastewater.

[0025] 4. This invention uses alternating operation of a micro-nano bubble generator and an electrochemical reaction tank, which can greatly reduce the equipment footprint. The overall wastewater treatment process does not involve a complex electrical control system, making it simple and efficient for treating high-concentration wastewater. It also has low maintenance costs and is easy to operate. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall internal structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the micro / nano bubble generator and electrochemical reaction tank structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the electrochemical reaction cell structure of the present invention;

[0030] Figure 5 This is a schematic cross-sectional view of the guide shaft structure of the present invention;

[0031] Figure 6This is a schematic diagram of the guide component structure of the present invention;

[0032] Figure 7 This is a cross-sectional view of the fixed tube and the dosing valve tube of the present invention;

[0033] Figure 8 This is a schematic diagram of the swing skid structure of the present invention.

[0034] Reference numerals: 1. Outer protective shell; 11. Water inlet pipe; 12. Exhaust pipe; 13. Sewage pipe; 2. First guide rail; 21. Thrust spring; 3. Second guide rail; 4. Swinging skid; 41. First driving hydraulic cylinder; 42. Second driving hydraulic cylinder; 43. Slide seat; 44. Telescopic support plate; 5. Micro / nano bubble generator; 51. Guide column; 52. Reinforcing connecting plate; 6. Electrochemical reaction cell; 61. Electrode plate; 62. Guide... 63. Telescopic head; 64. Pressure spring; 65. Guide component; 651. Adjusting sloping groove; 652. Reset guide groove; 66. Drain pipe; 7. Connecting pipe; 71. Fixed pipe; 72. Telescopic hose; 73. Dosing valve pipe; 74. T-shaped valve plate; 75. Torsion spring; 76. Through hole; 77. One-way valve plate; 78. Limiting component; 79. Arc-shaped sealing component; 8. Dosing tank; 9. High-pressure water plate; 91. Cleaning nozzle. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0036] Example 1, as Figures 1-8 As shown, a device for treating difficult wastewater using a micro-nano bubble electrochemical method includes an outer protective shell 1, with an inlet pipe 11 and an exhaust pipe 12 at the top of the outer protective shell 1, and a drain pipe 13 at the bottom of the outer protective shell 1.

[0037] The inner bottom of the outer protective shell 1 is provided with symmetrically distributed guide components on both sides. The guide components are composed of a first guide rail 2 and a second guide rail 3. The first guide rail 2 is composed of a vertical part and an arc-shaped flipping part. The second guide rail 3 is arranged correspondingly to the vertical part. The inside of the guide components is provided with a micro-nano bubble generating pool 5 and an electrochemical reaction pool 6. The micro-nano bubble generating pool 5 is located directly below the water inlet pipe 11. Two sets of guide posts 51 are provided on both sides of the micro-nano bubble generating pool 5 and the electrochemical reaction pool 6. The two sets of guide posts 51 are slidably connected in the first guide rail 2 and the second guide rail 3 respectively. A drain pipe 66 is provided at the bottom of the electrochemical reaction pool 6.

[0038] A connecting pipe 7 is provided between the micro-nano bubble generating pool 5 and the electrochemical reaction pool 6. A dosing tank 8 is fixedly installed on the outside of the electrochemical reaction pool 6 and is connected to the connecting pipe 7. Several electrode plates 61 are provided inside the electrochemical reaction pool 6. The spacing between adjacent electrode plates 61 is adjustable. High-pressure flushing components are provided on both sides of the inner wall of the outer protective shell 1.

[0039] Both ends of the bottom of the outer protective shell 1 are equipped with conical collection hoppers, and the sewage pipe 13 is connected to the conical collection hoppers to collect sewage and facilitate efficient sewage discharge. Two sets of guide columns 51 on the same side are connected by reinforcing connecting plates 52. This design can improve the stability of the rise and fall of the micro-nano bubble generator 5 and the electrochemical reaction tank 6.

[0040] Primary treatment: Wastewater enters through inlet pipe 11 and then flows into micro-nano bubble generator 5 from above. After the wastewater is injected, depending on the concentration of the wastewater, if the concentration is not very high, bubble generation will proceed directly. If the concentration is very high, the micro-nano bubble generator 5 will be raised and the electrochemical reaction tank 6 will be lowered. When the micro-nano bubble generator 5 is higher than the electrochemical reaction tank 6, the wastewater will automatically flow into the electrochemical reaction tank 6 through the connecting pipe 7 under the action of gravity. The wastewater will directly undergo electrochemical reaction. At this time, the spacing between the electrode plates 61 is the smallest and the current density is the highest. High current density and short reaction time are used to quickly oxidize and decompose pollutants. At this point, the wastewater concentration is at its highest, and the amount of precipitates and reactants produced is also greater. Therefore, if the micro-nano bubble generator 5 is not cleaned, secondary pollution will occur. Thus, when the micro-nano bubble generator 5 rises to the highest point of the second guide rail 3, the rise of the micro-nano bubble generator 5 is controlled. One end of the guide column 51 of the micro-nano bubble generator 5 is restricted by the second guide rail 3, while the other end of the guide column 51 is not restricted. Therefore, the micro-nano bubble generator 5 rotates around the center of the restricted guide column 51, and the other end of the guide column 51 slides along the arc-shaped flipping part. The micro-nano bubble generator 5 flips so that the opening is obliquely downward and facing the high-pressure flushing component. The high-pressure flushing component sprays a high-pressure jet to flush the inner wall of the micro-nano bubble generator 5. The flushing wastewater is discharged through the drain pipe 13. The oblique downward design allows for timely cleaning, resulting in high flushing efficiency. Cleaning can be achieved quickly with a short flush.

[0041] Secondary treatment: The micro / nano bubble generator 5 rotates to a horizontal position with its opening facing vertically upwards. Then, the micro / nano bubble generator 5 is lowered while the electrochemical reaction tank 6 rises. Wastewater treated by the electrochemical process automatically flows into the clean micro / nano bubble generator 5 through the connecting pipe 7. Simultaneously, the surfactant in the dosing tank 8 mixes with the wastewater and enters the micro / nano bubble generator 5. Since the dosing tank 8 is installed on the electrochemical reaction tank 6, i.e., at the wastewater inlet, the wastewater and surfactant can be effectively mixed in the connecting pipe 7. The surfactant used is Tween-80 (polysorbate 80), a non-ionic surfactant with good water solubility and foam stability, and it does not easily react with the electrodes. Therefore, it is suitable for high-concentration wastewater treatment and can effectively generate micro / nano bubbles. Subsequently, the wastewater generates micro / nano bubbles in the micro / nano bubble generator 5, optimizing bubble stability and gas solubility. During this process, the electrochemical reaction tank 6 is flipped so that its opening faces downwards, and the high-pressure flushing component sprays a high-pressure jet to clean the electrode plate 61 and the electrochemical reaction tank 6. After enough bubbles are generated, the micro-nano bubble generating pool 5 is raised again and the electrochemical reaction pool 6 is lowered. The wastewater re-enters the electrochemical reaction pool 6, and at this time the distance between adjacent electrode plates 61 increases, reducing the current density and achieving deep treatment of residual pollutants.

[0042] Tertiary treatment: Repeat the secondary treatment steps, but without adding surfactants this time. Increase the distance between adjacent electrode plates 61 again and reduce the current density. Through a lower density electrochemical reaction, ensure effective flocculation reaction, while avoiding electrode wear and bubble interference, to achieve tertiary treatment.

[0043] In summary, this invention achieves multi-stage wastewater treatment within a limited space, with a small footprint and compact structure.

[0044] Example 2, based on the above examples, further includes a swinging pry bar 4 rotatably mounted inside the outer protective shell 1. The swinging pry bar 4 is located inside the guide assembly and below the micro / nano bubble generating pool 5 and the electrochemical reaction pool 6. A first driving hydraulic cylinder 41 is hinged to the inner bottom of the outer protective shell 1. Two sets of symmetrically arranged second driving hydraulic cylinders 42 are fixedly mounted on the bottom of the swinging pry bar 4. Slide grooves are provided on both sides of the rotation center of the swinging pry bar 4. A slide seat 43 is slidably connected inside the slide groove. The slide seat 43 is connected to the telescopic end of the second driving hydraulic cylinder 42. A telescopic support plate 44 is fixedly mounted on the top of the slide seat 43. A thrust spring 21 is provided on the inner top of the arc-shaped flipping part.

[0045] In this embodiment, during switching, the second driving hydraulic cylinder 42 is first retracted, which drives the telescopic support plate 44 to slide downwards and reset. The thrust spring 21 pushes the electrochemical reaction tank 6 back. Then, the first driving hydraulic cylinder 41 is controlled to retract, which drives the swinging pry bar 4 to swing upwards at one end near the micro-nano bubble generating tank 5. The swinging pry bar 4 drives the micro-nano bubble generating tank 5 to rise through the telescopic support plate 44. The electrochemical reaction tank 6 descends under the action of gravity and always presses on the telescopic support plate 44. When the micro-nano bubble generating tank 5 rises higher than the electrochemical reaction tank 6, the sewage and bubble mixture in the micro-nano bubble generating tank 5 enters the electrochemical reaction tank 6. When the micro-nano bubble generating tank 5 drives the guide column 51 to rise to the top of the second guide rail 3 and the sewage is completely discharged, the second driving hydraulic cylinder 42 on the other side is controlled to extend. The second driving hydraulic cylinder 42 drives the telescopic support plate 44 to extend, and the telescopic support plate 44 pushes the micro-nano bubble generating tank 5 to flip so that the opening faces the high-pressure flushing component, thus completing the switching.

[0046] Furthermore, during bubble generation in the micro / nano bubble generating tank 5, the first driving hydraulic cylinder 41 is controlled to reciprocate, causing the swinging skid 4 to swing up and down with small amplitude. The micro / nano bubble generating tank 5 slides up and down on the vertical plane, causing the wastewater inside to slosh. In the bubble generating tank, the gas dissolution rate is crucial for the generation of micro / nano bubbles. The up-and-down sloshing of the liquid may promote gas diffusion and dissolution, especially at the gas-liquid interface. If the sloshing enhances the gas dissolution rate in the liquid, it may increase the number of micro / nano bubbles. Simultaneously, the electrochemical reaction tank 6 oscillates back and forth, adjusting the angle between the electrode plate 61 and the high-pressure rinsing component, allowing the high-pressure water flow to rinse different positions on the electrode plate 61, resulting in better cleaning.

[0047] During the electrochemical reaction, shaking up and down can promote the flow of wastewater and prevent the accumulation of deposits on the electrode surface, thereby avoiding electrode contamination or scaling and improving the service life of the electrode.

[0048] In embodiment three, based on the above embodiments, two sets of guide shafts 62 are provided inside the electrode plate 61. Each guide shaft 62 has a sliding hole at both ends. A telescopic head 63 is slidably connected inside the sliding hole. A pressure spring 64 is provided between the telescopic head 63 and the inner wall of the sliding hole. Several guide members 65 are provided on both sides of the inner wall of the electrochemical reaction cell 6. An annular guide groove is provided inside the guide member 65. The telescopic head 63 is inserted into the reversing guide groove. The annular guide groove consists of an adjusting inclined groove 651 and a reset guide groove 652. The adjusting inclined groove 651 is designed to tilt away from the center of the electrochemical reaction cell 6, and the tilt angle increases from the inside to the outside. The depth of the adjusting inclined groove 651 decreases from the bottom to the top. When the pressure spring 64 is compressed by one-third, the frictional force between the telescopic head 63 and the adjusting inclined groove 651 is greater than the weight of the electrode plate 61.

[0049] In this embodiment, the second driving hydraulic cylinder 42 extends, driving the telescopic support plate 44 to extend. The telescopic support plate 44 pushes the electrochemical reaction cell 6 to flip so that the opening is angled downwards. It should be noted that after the electrochemical reaction cell 6 flips, the original top of the adjusting groove 651 is angled downwards. For example, when the electrochemical reaction cell 6 is vertical, the angle between the adjusting groove 651 and the horizontal plane is 60°. After flipping 150°, the angle between the adjusting groove 651 and the horizontal plane is 30°, and the original top is angled downwards. Therefore, the electrode plate 61 will slide downwards a certain distance under the action of gravity, increasing the distance between adjacent electrode plates 61. The telescopic head 63 slides from the deeper part to the shallower part. When the telescopic head 63 is squeezed into the guide shaft 62 in the adjusting groove 651, the pressure spring 64 is squeezed. Since the friction between the telescopic head 63 and the adjusting groove 651 is greater than that between the electrode plates 651 when the pressure spring 64 is compressed by one-third, the friction between the telescopic head 63 and the adjusting groove 651 is greater than that between the electrode plates 651 and the horizontal plane. The second driving hydraulic cylinder 42 needs to extend quickly to accelerate the electrochemical reaction cell 6 due to the weight of plate 61. The thrust is much greater than the elastic force of the thrust spring 21. Therefore, when the thrust spring 21 is compressed to its limit, the electrochemical reaction cell 6 suddenly stops. At this time, the electrode plate 61 will generate a large inertial force. The acceleration can be achieved by being greater than the acceleration due to gravity. The specific value is calculated based on the actual equipment volume. At this time, the electrode plate 61 will continue to slide relative to the adjusting groove 651. Therefore, due to the different depths of the adjusting groove 651, the frictional force generated at different positions is different. The shallower the place, the greater the frictional force. By increasing the acceleration, the sliding length of the electrode plate 61 along the adjusting groove 651 can be controlled. The distance between adjacent electrode plates 61 is different. Using this principle, the distance between adjacent electrode plates 61 can be adjusted without any driving. The greater the acceleration, the greater the distance between adjacent electrode plates 61, and the smaller the current density. Furthermore, since the friction between the telescopic head 63 and the adjusting groove 651 is greater than the weight of the electrode plate 61 when the pressure spring 64 is compressed, the position of the electrode plate 61 remains unchanged when the second drive hydraulic cylinder 42 slowly retracts.

[0050] When the telescopic head 63 passes the adjusting sloping groove 651 and enters the reset guide groove 652, the telescopic head 63 extends. At this time, the pressure spring 64 is compressed to one-sixth. The friction between the telescopic head 63 and the inside of the reset guide groove 652 is much less than the weight of the electrode plate 61. Therefore, when the electrochemical reaction tank 6 swings back, it slides down under the guidance of the reset guide groove 652. When it slides down into the adjusting sloping groove 651, the telescopic head 63 extends completely and is not compressed, allowing for recirculation and continued treatment of subsequent wastewater.

[0051] Example 4, based on the above examples, further includes a connecting pipe 7 consisting of fixed pipes 71 at both ends and a telescopic flexible tube 72 in the middle. The fixed pipes 71 at both ends are fixedly connected to the inner bottom of the micro-nano bubble generating pool 5 and the electrochemical reaction pool 6, respectively.

[0052] A dosing valve pipe 73 is provided at the top of the fixed pipe 71 on the electrochemical reaction cell 6. A T-shaped valve plate 74 is rotatably installed inside the dosing valve pipe 73. A torsion spring 75 is provided at the rotation center of the T-shaped valve plate 74. The torsion spring 75 is used to drive the T-shaped valve plate 74 to swing to the vertical position. A limiting member 78 is provided on the inner wall of the dosing valve pipe 73. The limiting member 78 restricts the T-shaped valve plate 74 from rotating in the direction of the electrochemical reaction cell 6. A through hole 76 is opened in the lower half of the T-shaped valve plate 74. A one-way valve plate 77 is hinged to the through hole 76 on the side of the fixed pipe 71 that is close to the electrochemical reaction cell 6. Two sets of arc-shaped sealing members 79 are provided on the inner wall of the dosing valve pipe 73. The two sets of arc-shaped sealing members 79 are located below the upper limiting member 78 and above the lower limiting member 78, respectively.

[0053] The vertical part and the guiding depth of the second guide rail 3 are greater than the sum of the depths of the micro-nano bubble generator 5 and the electrochemical reaction tank 6, so that when the micro-nano bubble generator 5 and the electrochemical reaction tank 6 alternate, the sewage can be completely exchanged, and there is sufficient height difference for adjustment.

[0054] In this embodiment, the telescopic hose 72 ensures that the electrochemical reaction cell 6 and the micro / nano bubble generating cell 5 are not reversed.

[0055] When the electrochemical reaction tank 6 is higher than the micro-nano bubble generator tank 5, the wastewater in the electrochemical reaction tank 6 enters the micro-nano bubble generator tank 5 through the connecting pipe 7 under the action of gravity. The wastewater pushes the T-shaped valve plate 74 to swing towards the micro-nano bubble generator tank 5. The top of the T-shaped valve plate 74 swings to an inclination and exceeds the arc-shaped sealing part 79. The dosing valve pipe 73 opens, and the polysorbate 80 surfactant enters the fixed pipe 71 and is mixed with the wastewater into the micro-nano bubble generator tank 5, realizing automatic dosing. By controlling the height difference between the electrochemical reaction tank 6 and the micro-nano bubble generator tank 5, the wastewater flow rate can be controlled. The mixing speed and efficiency can be controlled according to the needs. When the wastewater concentration is high, a small flow rate and a small amount of reagent are added, resulting in more uniform mixing and higher subsequent bubble stability.

[0056] During secondary treatment, the height difference between the electrochemical reaction tank 6 and the micro / nano bubble generating tank 5 is at its maximum, the T-shaped valve plate 74 swings at its maximum angle, and the T-shaped valve plate 74 exceeds the arc-shaped sealing element 79, thus opening the dosing valve pipe 73. During tertiary treatment, no surfactant is needed; the height difference between the electrochemical reaction tank 6 and the micro / nano bubble generating tank 5 is at an intermediate value, the T-shaped valve plate 74 does not exceed the arc-shaped sealing element 79, and the dosing valve pipe 73 is closed, simplifying control.

[0057] When wastewater enters the electrochemical reaction tank 6 from the micro-nano bubble generator 5, the wastewater pushes the one-way valve plate 77 to swing, and the wastewater enters the electrochemical reaction tank 6 through the through hole 76. The T-shaped valve plate 74 does not swing under the action of the limiting member 78.

[0058] In summary, this invention utilizes only two sets of hydraulic drives to simultaneously achieve alternating lifting and lowering of the electrochemical reaction tank 6 and the micro / nano bubble generating tank 5, adjustment of current density, adjustment of mixing efficiency, improvement of bubble generation efficiency, and efficient cleaning of the electrode plate 61. This solves the problem that micro / nano bubble electrochemical methods cannot efficiently treat difficult, high-concentration wastewater. Its compact structure significantly reduces subsequent maintenance costs and makes it suitable for various wastewater treatment plants.

[0059] Example 5, based on the above examples, further includes an additional feature: when the T-shaped valve plate 74 is vertical, its bottom end is in sealed contact with the bottom of the fixed tube 71. With this design, when the micro / nano bubble generating tank 5 and the electrochemical reaction tank 6 are aligned, the wastewater inside both tanks does not flow, resulting in more stable flow guidance.

[0060] Example 6, based on the above examples, further includes a micro-nano bubble generating tank 5 internally equipped with both a micro-nano bubble generator and an ultrasonic generator. This dual bubble generation method enables faster and more efficient bubble production in wastewater.

[0061] Example 7, based on the above examples, further includes a high-pressure rinsing assembly consisting of a high-pressure water plate 9 and several cleaning nozzles 91, with the high-pressure water plate 9 tilted at an angle of 45°-60°.

[0062] The configuration of this embodiment allows the cleaning nozzle 91 to be better aligned with the micro-nano bubble generating pool 5 and the electrochemical reaction pool 6, resulting in a better cleaning effect.

[0063] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for treating difficult wastewater using a micro / nano bubble electrochemical method, comprising an outer protective shell (1), characterized in that, The top of the outer protective shell (1) is provided with a water inlet pipe (11) and an exhaust pipe (12), and the bottom of the outer protective shell (1) is provided with a sewage pipe (13). The inner bottom of the outer protective shell (1) is provided with symmetrically distributed guide components on both sides. The guide components are composed of a first guide rail (2) and a second guide rail (3). The first guide rail (2) is composed of a vertical part and an arc-shaped flipping part. The second guide rail (3) is arranged correspondingly to the vertical part. The guide components are provided with a micro-nano bubble generating pool (5) and an electrochemical reaction pool (6). The micro-nano bubble generating pool (5) is located directly below the water inlet pipe (11). Two sets of guide posts (51) are provided on both sides of the micro-nano bubble generating pool (5) and the electrochemical reaction pool (6). The two sets of guide posts (51) are slidably connected in the first guide rail (2) and the second guide rail (3) respectively. A drain pipe (66) is provided at the bottom of the electrochemical reaction pool (6). A connecting pipe (7) is provided between the micro-nano bubble generating pool (5) and the electrochemical reaction pool (6). A dosing tank (8) is fixedly installed on the outside of the electrochemical reaction pool (6). The dosing tank (8) is connected to the connecting pipe (7). Several electrode plates (61) are provided inside the electrochemical reaction pool (6). The spacing between adjacent electrode plates (61) is adjustable. High-pressure flushing components are provided on both sides of the inner wall of the outer protective shell (1). The outer protective shell (1) is rotatably mounted with a swinging pry bar (4). The swinging pry bar (4) is located inside the guide assembly and below the micro-nano bubble generating pool (5) and the electrochemical reaction pool (6). The inner bottom of the outer protective shell (1) is hinged with a first driving hydraulic cylinder (41). The bottom of the swinging pry bar (4) is fixedly mounted with two sets of symmetrically arranged second driving hydraulic cylinders (42). The swinging pry bar (4) has a sliding groove on both sides of the rotation center. The sliding groove is slidably connected with a slide seat (43). The slide seat (43) is connected to the telescopic end of the second driving hydraulic cylinder (42). The top of the slide seat (43) is fixedly mounted with a telescopic support plate (44). The inner top of the arc-shaped flipping part is provided with a thrust spring (21).

2. The device for treating difficult wastewater using a micro-nano bubble electrochemical method according to claim 1, characterized in that, The electrode plate (61) is provided with two sets of guide shafts (62) inside. Both ends of the guide shafts (62) are provided with sliding holes. The sliding holes are slidably connected with telescopic heads (63). A pressure spring (64) is provided between the telescopic head (63) and the inner wall of the sliding hole. Several guide members (65) are provided on both sides of the inner wall of the electrochemical reaction cell (6). The guide members (65) are provided with annular guide grooves inside. The telescopic head (63) is inserted into the annular guide groove. The annular guide groove is composed of an adjusting inclined groove (651) and a reset guide groove (652). The adjusting inclined groove (651) is designed to be inclined away from the center of the electrochemical reaction cell (6), and the inclination angle increases from the inside to the outside. The depth of the adjusting inclined groove (651) decreases from the bottom to the top. When the pressure spring (64) is compressed by one-third, the friction between the telescopic head (63) and the adjusting inclined groove (651) is greater than the weight of the electrode plate (61).

3. The device for treating difficult wastewater using a micro-nano bubble electrochemical method according to claim 2, characterized in that, The connecting pipe (7) consists of fixed pipes (71) at both ends and a telescopic flexible tube (72) in the middle. The fixed pipes (71) at both ends are fixedly connected to the bottom of the micro-nano bubble generating pool (5) and the electrochemical reaction pool (6), respectively.

4. The device for treating difficult wastewater using a micro-nano bubble electrochemical method according to claim 3, characterized in that, A dosing valve tube (73) is provided at the top of the fixed tube (71) of the electrochemical reaction cell (6). A T-shaped valve plate (74) is rotatably installed inside the dosing valve tube (73). A torsion spring (75) is provided at the rotation center of the T-shaped valve plate (74). The torsion spring (75) is used to drive the T-shaped valve plate (74) to swing to vertical. Two sets of limiting members (78) are provided on the inner wall of the dosing valve tube (73). The limiting members (78) restrict the T-shaped valve plate (74) from moving towards the electrochemical reaction cell (6). The reaction tank (6) rotates in the direction of the T-shaped valve plate (74), and the lower half of the T-shaped valve plate (74) is provided with a through hole (76), and the through hole (76) is located in the fixed pipe (71). A one-way valve plate (77) is hinged to the side of the through hole (76) near the electrochemical reaction tank (6). The inner wall of the dosing valve pipe (73) is provided with two sets of arc-shaped sealing parts (79), and the two sets of arc-shaped sealing parts (79) are located below the upper limiting part (78) and above the lower limiting part (78), respectively.

5. The device for treating difficult wastewater using a micro-nano bubble electrochemical method according to claim 4, characterized in that, When the T-shaped valve plate (74) is vertical, its bottom end is in sealed contact with the bottom of the fixed tube (71).

6. A device for treating difficult wastewater using a micro / nano bubble electrochemical method according to any one of claims 1-5, characterized in that, The micro-nano bubble generating pool (5) is equipped with a micro-nano bubble generator and an ultrasonic generator.

7. The device for treating difficult wastewater using a micro / nano bubble electrochemical method according to claim 6, characterized in that, The high-pressure flushing assembly consists of a high-pressure water plate (9) and several cleaning nozzles (91), with the high-pressure water plate (9) tilted at an angle of 45°-60°.

8. The device for treating difficult wastewater using a micro-nano bubble electrochemical method according to claim 7, characterized in that, The vertical section and the second guide rail (3) have a guiding depth greater than the sum of the depths of the micro-nano bubble generating pool (5) and the electrochemical reaction pool (6).

9. The device for treating difficult wastewater using a micro-nano bubble electrochemical method according to claim 8, characterized in that, Both ends of the bottom of the outer protective shell (1) are provided with conical collection hoppers, and the sewage pipe (13) is connected to the conical collection hopper. The two sets of guide columns (51) on the same side are connected by reinforcing connecting plates (52).

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