Aquaculture tail water antibiotic purification device and method based on photocatalytic backwashing function

Abstract

This invention relates to the field of photocatalytic purification devices, and discloses a device and method for purifying aquaculture wastewater of antibiotics based on photocatalytic backwashing. The device includes a tank and an inlet and outlet pipe connected to its top. The tank contains a catalytic reaction assembly, a photoexcitation assembly, and a backwashing system. The catalytic reaction assembly includes multiple longitudinally arranged honeycomb carriers. The photoexcitation assembly includes multiple sets of lamps, each set located below the multiple honeycomb carriers. The backwashing system triggers a backwashing action based on the pressure difference across the catalytic reaction assembly, backwashing the lamps and honeycomb carriers. A driving device is also included. Through the backwashing system, a first pressure sensor and a second pressure sensor collect the fluid pressure across the catalytic reaction assembly in real time. Once the pressure difference reaches a preset threshold, a fully automatic pressure-triggered backwashing operation is performed.

Description

Technical Field

[0001] This invention relates to the field of photocatalytic purification devices, specifically to a device and method for purifying antibiotics in aquaculture wastewater based on photocatalytic backwashing. Background Technology

[0002] Aquaculture wastewater is the waste water generated during the aquaculture process. It typically contains trace amounts of antibiotics, organic pollutants, suspended solids, and microorganisms. Direct discharge can easily cause water pollution and ecological imbalance. Therefore, specialized purification equipment is needed to treat the wastewater to render it harmless before discharge. Photocatalytic purification devices are currently commonly used for aquaculture wastewater treatment. These devices mainly consist of a purification tank, inlet components, outlet components, a photocatalytic reaction structure, and a lighting structure. They utilize photocatalytic technology to harmlessly degrade pollutants in the water. The lighting structure provides a specific light source, stimulating the photocatalytic materials to generate active oxidizing groups, which can specifically decompose antibiotics and various organic pollutants in the water. Compared to traditional physical filtration and biological purification methods, photocatalytic purification is highly targeted and produces no secondary pollution. It is widely used in wastewater purification operations for various large-scale aquaculture operations, effectively removing harmful impurities and achieving compliant purification of aquaculture wastewater.

[0003] However, the existing technology has the following problems: In practical applications, existing photocatalytic purification equipment for aquaculture wastewater has a fixed structure in the photocatalytic reaction zone, resulting in limited contact range and poor uniformity between the water and the catalytic material. This can easily lead to incomplete reactions and limited overall purification efficiency. Furthermore, aquaculture wastewater has a complex composition, containing a large amount of suspended impurities, organic colloids, and biological membranes. During long-term continuous operation, various impurities can easily adhere to and accumulate on the surface of the catalytic reaction zone and light source components, causing problems such as blocking the light path, weakening the light excitation effect, and reducing the photocatalytic reaction activity. It can also easily cause catalytic channel blockage and reduced water flow. Summary of the Invention

[0004] The purpose of this invention is to provide an antibiotic purification device and method for aquaculture wastewater based on photocatalytic backwashing function in order to solve the above-mentioned problems. It aims to overcome the defects of existing catalytic reaction areas and light source components that are prone to accumulating impurities, which affect the catalytic effect. Details are described below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides an antibiotic purification device for aquaculture wastewater based on photocatalytic backwashing function, comprising a tank and an inlet pipe and an outlet pipe connected above it. The tank is equipped with a catalytic reaction component, a photoexcitation component, and a backwashing system. The catalytic reaction component includes multiple longitudinally arranged honeycomb carriers. The photoexcitation component includes multiple sets of lamps, each set of lamps being located below the multiple honeycomb carriers. The backwashing system triggers a backwashing action based on the pressure difference across the catalytic reaction component to backwash the lamps and the honeycomb carriers. The device also includes a drive device for rotating the multiple honeycomb carriers.

[0006] Preferably, the catalytic reaction assembly further includes an inner shell, which is installed inside the tank. Multiple honeycomb carriers are rotatably installed inside the inner shell, with gaps between adjacent honeycomb carriers. A flow guide is connected to the top of the inner shell, the liquid inlet pipe is located at the top of the tank and communicates with the flow guide, and the liquid outlet pipe is located at the bottom of the tank.

[0007] Preferably, the honeycomb carrier is cylindrical and has honeycomb-shaped channels extending through it along its axial direction.

[0008] Preferably, the lamp tube is rotatably connected to two ends, the connectors are installed on the inner shell, the tank is provided with wires, and the connector of the lamp tube near the wire end is electrically connected to the wires.

[0009] Preferably, the backwashing system includes a backwash pipe, a drain pipe, a first pressure sensor, and a second pressure sensor. The backwash pipe is connected to the bottom of the tank, and the drain pipe is connected to the top of the tank and communicates with the flow guide. The inlet pipe, the outlet pipe, the backwash pipe, and the drain pipe are each equipped with a solenoid valve, and the four solenoid valves are controlled by a unified control system. The first pressure sensor is installed on the top of the tank and its pressure measuring end extends into the flow guide. The second pressure sensor is installed on the bottom of the tank and its pressure measuring end extends below the catalytic reaction assembly.

[0010] Preferably, the driving device includes a motor and a drive shaft. The motor is mounted on the top of the tank, and the drive shaft is connected to the output end of the motor and extends into the interior of the tank. The plurality of the honeycomb carriers are all connected to the outer wall of the drive shaft for transmission.

[0011] Preferably, the outer wall of the lamp tube is connected to a collar, and multiple levers are connected in a circumferential array on the collar. The bottom surface of the honeycomb carrier is connected to a fixing ring, and multiple protrusions are connected in a circumferential array on the fixing ring. When the protrusions move, they can contact one of the levers on the collar and push the collar to rotate.

[0012] Preferably, a scraper is connected to the connector on the lamp tube away from the collar, and the scraper contacts the outer wall of the lamp tube.

[0013] Preferably, the top of the inner housing is provided with a filtration mechanism, which includes a filter screen connected to the inner wall of the inner housing and located below the flow guide. The drive shaft passes through the filter screen and is rotatably connected to it. Two cleaning rods are connected to the outer wall of the drive shaft, and the cleaning rods are in contact with the top surface of the filter screen.

[0014] A method for purifying antibiotics in aquaculture wastewater based on photocatalytic backwashing includes the following steps: Step 1: Open the inlet pipe and outlet pipe, close the backwash pipe and drain pipe, and the aquaculture wastewater enters the tank and is pre-filtered through the filter screen; Step 2: Start the drive device to drive the multi-layer honeycomb carrier to rotate synchronously, and at the same time light up each group of lamps to provide a photocatalytic excitation light source; Step 3: The effluent flows from top to bottom through the rotating honeycomb carrier, and under the action of light, it undergoes a photocatalytic reaction with the photocatalytic coating on the surface of the honeycomb carrier, degrading antibiotics and organic pollutants in the water. Step 4: During the rotation of the honeycomb carrier, the protrusions and levers work together to mechanically drive the lamp tube to rotate slightly, while the scraper cleans the outer wall of the lamp tube in real time. Step 5: Real-time monitoring of the pressure difference across the catalytic reaction assembly using the first and second pressure sensors to monitor the carrier blockage status. Step 6: When the pressure difference reaches the preset threshold, close the inlet pipe and outlet pipe, open the backwash pipe and drain pipe, and use the reverse water flow to automatically backwash the honeycomb carrier and lamp tube. The backwash wastewater is discharged from the drain pipe. After the backwashing is completed, the normal purification operation will be restored automatically.

[0015] The beneficial effects are: 1. This aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function, through the cooperation of catalytic reaction components and light excitation components, allows the water to flow through multiple honeycomb carriers and multiple sets of lamps in sequence, efficiently decomposing harmful antibiotic substances in the water.

[0016] 2. This aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function uses a backwashing system to collect the fluid pressure at both ends of the catalytic reaction component in real time through the first and second pressure sensors. When the pressure difference reaches a preset threshold, the control system closes the solenoid valves of the inlet and outlet pipes and opens the solenoid valves of the backwash pipe and the sewage pipe to perform a fully automatic pressure difference triggered backwashing operation. During the rinsing process, the silt and biofilm attached to the honeycomb carrier pores are simultaneously flushed away to prevent impurities from covering and blocking the catalytic coating, thus ensuring that the catalytic coating always maintains good reactivity.

[0017] 3. This aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function, through the setting of the drive device, enables multiple honeycomb carriers to rotate synchronously and uniformly. During the rotation of the honeycomb carriers, the angle of the internal water flow can be changed, which enhances the water disturbance effect and allows the aquaculture wastewater to fully collide and contact with the catalytic coating on the surface of the carrier, further improving the sufficiency of the photocatalytic reaction. At the same time, the rotation state allows each channel of the honeycomb carrier to receive light from all directions, avoiding the local catalytic coating from being in a light-proof state for a long time, which reduces the reaction efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the tank body of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the catalytic reaction component structure of the present invention; Figure 4 This is a schematic diagram of the structure of the light excitation component of the present invention; Figure 5 This is a schematic diagram of the first pressure sensor of the present invention; Figure 6 This is a schematic diagram of the drive device structure of the present invention; Figure 7 This is a schematic diagram of the lamp tube structure of the present invention; Figure 8 This is a schematic diagram of the bump structure of the present invention.

[0020] The annotations in the attached figures are explained as follows: 1. Tank body; 2. Inlet pipe; 3. Drain pipe; 4. Backwash pipe; 5. Sewage pipe; 6. Drive unit; 61. Motor; 62. Drive shaft; 7. Catalytic reaction assembly; 71. Inner shell; 72. Flow guide; 73. Honeycomb carrier; 8. Light excitation assembly; 81. Wire; 82. Connector; 83. Lamp tube; 84. Collar; 85. Lever; 86. Retaining ring; 87. Protrusion; 88. Scraper; 9. Filtration mechanism; 91. Filter screen; 92. Cleaning rod; 10. First pressure sensor; 11. Second pressure sensor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] The first embodiment of the present invention is as follows: Please see Figure 1 - Figure 5 The aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function includes a tank 1 and an inlet pipe 2 and an outlet pipe 3 connected above it. The tank 1 is equipped with a catalytic reaction component 7, a photo-excitation component 8, and a backwashing system. The aquaculture wastewater is sent into the tank 1 for treatment through the inlet pipe 2 and then discharged through the outlet pipe 3. The tank 1 forms a closed purification chamber. The catalytic reaction component 7 is responsible for completing the photocatalytic degradation reaction of pollutants such as antibiotics. The photo-excitation component 8 provides the necessary excitation light source for the catalytic reaction. The backwashing system can automatically complete the overall cleaning operation after the equipment is blocked. The three work together to achieve continuous purification and autonomous cleaning of wastewater.

[0023] Specifically, the catalytic reaction assembly 7 includes multiple longitudinally arranged honeycomb carriers 73. The catalytic reaction assembly 7 also includes an inner shell 71, which is installed inside the tank 1. The multiple honeycomb carriers 73 are rotatably installed inside the inner shell 71, with gaps between adjacent honeycomb carriers 73. A flow guide shroud 72 is connected to the top of the inner shell 71. An inlet pipe 2 is located at the top of the tank 1 and communicates with the flow guide shroud 72. A drain pipe 3 is located at the bottom of the tank 1. The honeycomb carriers 73 are cylindrical and have honeycomb-shaped channels extending along their axial direction. The inner shell 71 provides positioning and limiting for all the internal honeycomb carriers 73. The system gathers the water flow to direct the flow of the wastewater. The guide hood 72 can evenly distribute the wastewater sent in by the inlet pipe 2, allowing the water to flow smoothly into the internal channel of the uppermost honeycomb carrier 73. The longitudinal arrangement structure extends the water flow path, and the water passes through multiple honeycomb carriers 73 from top to bottom. The axially penetrating channels of the honeycomb carriers 73 are evenly distributed in a porous shape, which can greatly increase the contact area between the water and the catalytic coating. The gaps reserved between adjacent honeycomb carriers 73 provide installation space for the light excitation component 8. Finally, the purified water is discharged from the bottom drain pipe 3, effectively improving the purification efficiency of aquaculture wastewater.

[0024] In this embodiment, the honeycomb carrier 73 is made entirely of a high-temperature and corrosion-resistant ceramic substrate. Its inner and outer walls, as well as the inner wall surface of the channels, are uniformly coated with a special photocatalytic coating. The main body of the catalytic coating is made of nano-titanium dioxide composite modified catalytic powder, compounded with a small amount of silver-based antibacterial agent and rare earth co-catalytic components. It can stably generate strong oxidizing active groups under visible light and ultraviolet light irradiation, which can efficiently oxidize and decompose residual antibiotics, veterinary drug residues, organic pollutants, and some harmful substances such as ammonia nitrogen in aquaculture tail water. The catalytic coating is fully coated by vacuum negative pressure dip coating combined with high temperature curing process. First, the formed honeycomb carrier 73 is completely immersed in the prepared liquid catalytic slurry. The negative pressure suction is used to make the slurry fully penetrate into the inner wall of each small channel to ensure that there is no dead corner slurry. Then, the excess slurry is removed by low-speed centrifugation. Finally, it is sent to a constant temperature kiln for gradient temperature rise high-temperature sintering and curing, so that the catalytic coating is tightly bonded to the ceramic substrate and is not easy to fall off. It ensures sufficient contact area for catalytic reaction and has the characteristics of being resistant to water erosion, acid and alkali sewage corrosion, and not easy to powder and fall off after long-term use.

[0025] Furthermore, the light excitation component 8 includes multiple sets of lamps 83, each set of lamps 83 being located below multiple honeycomb carriers 73. Each end of the lamp 83 is rotatably connected to a connector 82, which is installed on the inner shell 71. A wire 81 is provided inside the tank 1. The connector 82 at the end of the lamp 83 closest to the wire 81 is electrically connected to the wire 81. The lamp 83 is suspended inside the inner shell 71 by the rotatable connectors 82 at both ends. The wire 81 completes the circuit conduction through the connector 82, providing stable power to the lamp 83. Except for the bottommost lamp 83, each of the other lamps 83 is arranged between the upper and lower honeycomb carriers 73, which can light excite the tailwater of the upper and lower honeycomb carriers 73. The bottommost lamp 83 light excites the honeycomb carrier 73 above it, causing the catalytic substances on the surface of the honeycomb carrier 73 to undergo a rapid catalytic reaction. As the water flows through multiple honeycomb carriers 73 and multiple sets of lamps 83 in sequence, it efficiently decomposes antibiotics and harmful substances inside the water.

[0026] The backwashing system triggers a backwashing action based on the pressure difference across the catalytic reaction component 7, backwashing the lamp tube 83 and the honeycomb carrier 73. The backwashing system includes a backwash pipe 4, a drain pipe 5, a first pressure sensor 10, and a second pressure sensor 11. The backwash pipe 4 is connected to the bottom of the tank 1, and the drain pipe 5 is connected to the top of the tank 1 and communicates with the guide shroud 72. Solenoid valves are installed on the inlet pipe 2, the outlet pipe 3, the backwash pipe 4, and the drain pipe 5, and all four solenoid valves are controlled by a unified control system. The first pressure sensor 10 is installed on the top of the tank 1, with its pressure measuring end extending into the guide shroud 72. The second pressure sensor 11 is installed at the bottom of the tank 1, with its pressure measuring end extending below the catalytic reaction component 7. Both the first pressure sensor 10 and the second pressure sensor 11 are connected to the control system. Under normal conditions, the solenoid valves of the inlet pipe 2 and the outlet pipe 3 are open, and the first pressure sensor 10 collects real-time data on the water inlet area at the top of the catalytic reaction component 7. The second pressure sensor 11 collects the fluid pressure in the lower outlet area of ​​the catalytic reaction component 7 in real time. The two pressure values ​​are compared in real time to form a pressure difference. When impurities attached to the channels of the honeycomb carrier 73 cause blockage, the pressure difference between the upper and lower ends will continue to rise. When the pressure difference reaches the preset threshold, the control system closes the solenoid valves of the inlet pipe 2 and the outlet pipe 3, and opens the solenoid valves of the backwash pipe 4 and the drain pipe 5. Clean water is flushed into the tank 1 from the bottom backwash pipe 4 in reverse, and flushes the sludge, suspended solids and other impurities attached to the channels of the honeycomb carrier 73 and the outer wall of the lamp tube 83 from bottom to top. The wastewater with impurities is finally discharged from the top drain pipe 5 through the guide hood 72, completing the fully automatic pressure difference triggered reverse flushing operation. During the flushing process, the sludge and biofilm attached to the channels of the honeycomb carrier 73 are flushed away at the same time, avoiding the impurities from covering and blocking the catalytic coating, ensuring that the catalytic coating always maintains good reactivity, without the need for manual monitoring and cleaning, and ensuring the long-term stable operation of the equipment.

[0027] Based on the above embodiments, the second embodiment of the present invention is as follows: Please see Figure 3 , Figure 6 It also includes a drive device 6 for driving the rotation of multiple honeycomb carriers 73. The drive device 6 includes a motor 61 and a transmission shaft 62. The motor 61 is installed on the top of the tank 1. The transmission shaft 62 is connected to the output end of the motor 61 and extends into the inside of the tank 1. Multiple honeycomb carriers 73 are connected to the outer wall of the transmission shaft 62. The motor 61 serves as a power output source and can drive the transmission shaft 62 to rotate synchronously during operation. The rotational power is transmitted synchronously to all honeycomb carriers 73 through the transmission connection structure, so that all longitudinally arranged honeycomb carriers 73 rotate synchronously and uniformly. During the rotation of the honeycomb carriers 73, the angle of the internal water flow can be changed, which enhances the water disturbance effect and allows the aquaculture wastewater to fully collide and contact with the catalytic coating on the carrier surface, further improving the sufficiency of the photocatalytic reaction. At the same time, the rotation state allows each channel of the honeycomb carrier 73 to receive light from all directions, avoiding the local catalytic coating from being in a light-proof state for a long time, which reduces the reaction efficiency.

[0028] Based on the above embodiments, the third embodiment of the present invention is as follows: Please see Figure 6 - Figure 8 A collar 84 is connected to the outer wall of the lamp tube 83. Multiple levers 85 are connected in a circular array on the collar 84. A fixing ring 86 is connected to the bottom surface of the honeycomb carrier 73. Multiple protrusions 87 are connected in a circular array on the fixing ring 86. When the protrusions 87 move, they can contact one of the levers 85 on the collar 84 and push the collar 84 to rotate. When the honeycomb carrier 73 rotates with the drive shaft 62, it will drive the bottom fixing ring 86 and the circularly distributed protrusions 87 to perform circular motion synchronously. During the rotation, the protrusions 87 will intermittently abut against the levers 85 on the outside of the collar 84, relying on pure mechanical contact transmission. The method drives the collar 84 and the lamp tube 83 to complete a small reciprocating rotational motion. After each protrusion 87 disengages from the lever 85, another lever 85 moves to the movement trajectory of the next protrusion 87, so that the levers 85 on the collar 84 are pushed in sequence to achieve cyclic rotation. When the collar 84 rotates, it drives the lamp tube 83 to rotate synchronously, so that the lamp tube 83 can continuously shake off the impurities attached to itself through circumferential rotation, avoiding the accumulation of impurities in its top area, which would affect the upward lighting effect. This ensures that the lamp tube 83 can always maintain a relatively uniform lighting effect around its circumference, and avoids the formation of shadows due to the accumulation of impurities in some areas.

[0029] It is worth noting that a scraper 88 is connected to the connector 82 on the lamp tube 83 away from the collar 84. The scraper 88 contacts the outer wall of the lamp tube 83 and adheres to the horizontal side wall of the lamp tube 83. It will not obstruct or affect the upward or downward illumination effect of the lamp tube 83. When the lamp tube 83 rotates, the stationary scraper 88 performs all-round friction and wiping on the entire outer wall of the lamp tube 83, removing impurities from the outer wall of the lamp tube 83, further maintaining the cleanliness of the outer wall of the lamp tube 83, and ensuring stable output of light intensity.

[0030] Based on the above embodiments, the fourth embodiment of the present invention is as follows: Please see Figure 3 , Figure 6The inner shell 71 has a filter mechanism 9 at its top, which includes a filter screen 91. The filter screen 91 is connected to the inner wall of the inner shell 71 and located below the flow guide 72. A drive shaft 62 passes through the filter screen 91 and is rotatably connected to it. Two cleaning rods 92 are connected to the outer wall of the drive shaft 62, and the cleaning rods 92 contact the top surface of the filter screen 91. The aquaculture wastewater guided by the flow guide 72 will first pass through the filter screen 91 for pre-filtration, intercepting large particles of debris, aquatic plant debris, aquaculture waste, and other large-volume impurities in the water. To reduce the problem of large particles of impurities entering the honeycomb carrier 73 and causing serious blockage and large-area coverage of the catalytic coating, the drive shaft 62 rotates with the motor 61, which simultaneously drives the two outer cleaning rods 92 to sweep around the top surface of the filter screen 91 in a circular motion, scraping away the trapped impurities accumulated on the top surface of the filter screen 91 in real time. This enables the filter screen 91 to clean itself automatically during operation, avoiding the problem of filter screen 91 being blocked and causing poor water intake. When the backwashing action is performed, the impurities on the filter screen 91 are discharged with the water flow.

[0031] Based on the above embodiments, the fifth embodiment of the present invention is as follows: The method for purifying antibiotics in aquaculture wastewater based on photocatalytic backwashing, using the aquaculture wastewater antibiotic purification device based on photocatalytic backwashing described in the above embodiments, further includes the following steps: Step 1: Normally open the solenoid valves on the inlet pipe 2 and the outlet pipe 3, and close the solenoid valves on the backwash pipe 4 and the drain pipe 5. The aquaculture wastewater is sent into the tank 1 through the inlet pipe 2. After being evenly distributed by the guide hood 72, it first flows through the filter screen 91 to complete the pre-filtration, intercepting large solid impurities in the water.

[0032] Step 2: Start the drive device 6. The motor 61 drives the transmission shaft 62 to rotate, synchronously driving all the longitudinally arranged honeycomb carriers 73 to rotate at a uniform speed. At the same time, the wires 81 are connected to supply power to each group of lamps 83, providing light excitation conditions for the lamps 83 to emit light normally.

[0033] Step 3: The filtered aquaculture wastewater flows from top to bottom through the multi-layer rotating honeycomb carrier 73. The water fully contacts the photocatalytic coating on the surface of the honeycomb carrier 73 and the inner wall of the pores. Under the excitation of light from the lamp tube 83, the catalytic coating generates strong oxidizing active groups, which oxidize and decompose harmful substances such as residual antibiotics, veterinary drug residues, and organic pollutants in the water, thus completing the purification reaction.

[0034] Step 4: During the rotation of the honeycomb carrier 73, the bottom protrusion 87 rotates synchronously. The lever 85 is intermittently moved to drive the lamp tube 83 to rotate slightly in a cycle. The stationary scraper 88 wipes the outer wall of the lamp tube 83 in real time to remove attached dirt and ensure stable and uniform light output.

[0035] Step 5: The first pressure sensor 10 and the second pressure sensor 11 monitor the fluid pressure at both ends of the catalytic reaction component 7 in real time and calculate the pressure difference between the two ends in real time. When the pressure difference reaches the preset blockage threshold, the device automatically switches the operating mode and closes the solenoid valves of the inlet pipe 2 and the outlet pipe 3.

[0036] Step Six: The solenoid valves of backwash pipe 4 and drain pipe 5 are automatically opened. Clean water flows in reverse from the bottom of tank 1 through backwash pipe 4, and thoroughly backwashes the inner wall of the honeycomb carrier 73 pores and the outer wall of the lamp tube 83 from bottom to top. The sludge, suspended solids, biological mucus and other impurities washed off are collected with the reverse water flow to the guide hood 72, and finally discharged through the top drain pipe 5. After the flushing is completed, the device automatically resets and resumes normal tailwater purification operation.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An antibiotic purification device for aquaculture wastewater based on photocatalytic backwashing function, comprising a tank (1) and an inlet pipe (2) and an outlet pipe (3) connected above it, characterized in that: The tank (1) is equipped with a catalytic reaction assembly (7), a photoexcitation assembly (8), and a backwashing system; The catalytic reaction assembly (7) includes multiple longitudinally arranged honeycomb carriers (73). The light excitation component (8) includes multiple sets of lamp tubes (83), each set of lamp tubes (83) being located below multiple cellular carriers (73); The backwashing system triggers the backwashing action based on the pressure difference at both ends of the catalytic reaction component (7) to backwash the lamp tube (83) and the honeycomb carrier (73); It also includes a drive unit (6) for driving the rotation of multiple cellular carriers (73); The catalytic reaction assembly (7) also includes an inner shell (71), which is installed inside the tank (1). Multiple honeycomb carriers (73) are rotatably installed inside the inner shell (71). There is a gap between adjacent honeycomb carriers (73). A flow guide (72) is connected to the top of the inner shell (71). The liquid inlet pipe (2) is located at the top of the tank (1) and communicates with the flow guide (72). The liquid outlet pipe (3) is located at the bottom of the tank (1). The lamp tube (83) is rotatably connected to two connectors (82) at both ends. The connectors (82) are installed on the inner shell (71). The tank (1) is provided with a wire (81). The connector (82) of the lamp tube (83) near the wire (81) is electrically connected to the wire (81). The outer wall of the lamp tube (83) is connected to a collar (84), and multiple levers (85) are connected in a circular array on the collar (84). The bottom surface of the honeycomb carrier (73) is connected to a fixing ring (86), and multiple protrusions (87) are connected in a circular array on the fixing ring (86). When the protrusions (87) move, they can contact one of the levers (85) on the collar (84) and push the collar (84) to rotate. A scraper (88) is connected to the connector (82) on the lamp tube (83) away from the collar (84), and the scraper (88) contacts the outer wall of the lamp tube (83).

2. The aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function according to claim 1, characterized in that: The honeycomb carrier (73) is cylindrical and has honeycomb-shaped channels extending through it along its axial direction.

3. The aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function according to claim 1, characterized in that: The backwashing system includes a backwash pipe (4), a drain pipe (5), a first pressure sensor (10), and a second pressure sensor (11). The backwash pipe (4) is connected to the bottom of the tank (1), and the drain pipe (5) is connected to the top of the tank (1) and communicates with the flow guide (72). The inlet pipe (2), the outlet pipe (3), the backwash pipe (4), and the drain pipe (5) are each equipped with a solenoid valve, and the four solenoid valves are controlled by a unified control system. The first pressure sensor (10) is installed on the top of the tank (1) and its pressure measuring end extends into the flow guide (72). The second pressure sensor (11) is installed on the bottom of the tank (1) and its pressure measuring end extends below the catalytic reaction assembly (7).

4. The aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function according to claim 1, characterized in that: The drive device (6) includes a motor (61) and a drive shaft (62). The motor (61) is installed on the top of the tank (1). The drive shaft (62) is connected to the output end of the motor (61) and extends into the tank (1). The multiple honeycomb carriers (73) are connected to the outer wall of the drive shaft (62) for transmission.

5. The aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function according to claim 4, characterized in that: The inner shell (71) is provided with a filter mechanism (9) at the top. The filter mechanism (9) includes a filter screen (91). The filter screen (91) is connected to the inner wall of the inner shell (71) and located below the flow guide (72). The drive shaft (62) passes through the filter screen (91) and is rotatably connected to it. Two cleaning rods (92) are connected to the outer wall of the drive shaft (62). The cleaning rods (92) are in contact with the top surface of the filter screen (91).

6. A method for purifying antibiotics in aquaculture wastewater based on photocatalytic backwashing, characterized in that: The aquaculture wastewater antibiotic purification device based on photocatalytic backwashing function as described in any one of claims 1-5 further includes the following steps: Step 1: Open the inlet pipe (2) and the outlet pipe (3), close the backwash pipe (4) and the sewage pipe (5), and the aquaculture tailwater enters the tank (1) and is pre-filtered by the filter screen (91); Step 2: Start the drive device (6) to drive the multi-layer honeycomb carrier (73) to rotate synchronously, and at the same time light up each group of lamp tubes (83) to provide a photocatalytic excitation light source; Step 3: The tailwater flows from top to bottom through the rotating honeycomb carrier (73) layer by layer. Under the action of light, it undergoes a photocatalytic reaction with the photocatalytic coating on the surface of the honeycomb carrier (73) to degrade antibiotics and organic pollutants in the water. Step 4: During the rotation of the honeycomb carrier (73), the protrusion (87) and the lever (85) work together to drive the lamp tube (83) to rotate slightly mechanically, and the scraper (88) cleans the outer wall of the lamp tube (83) in real time. Step 5: Real-time monitoring of the pressure difference across the catalytic reaction assembly (7) is achieved by using the first pressure sensor (10) and the second pressure sensor (11) to monitor the carrier blockage status in real time; Step 6: When the pressure difference reaches the preset threshold, close the inlet pipe (2) and the outlet pipe (3), open the backwash pipe (4) and the drain pipe (5), and use the reverse water flow to automatically backwash the honeycomb carrier (73) and the lamp tube (83). The backwash wastewater is discharged from the drain pipe (5). After the backwash is completed, the normal purification operation will be restored automatically.

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