Reciprocating type self-cleaning photocatalysis device and method for purifying aquaculture tail water

Abstract

The invention discloses a reciprocating type self-cleaning photocatalysis device and method for purifying aquaculture tail water. The device comprises a transmission lead screw, a self-cleaning nut assembly, a self-sweeping sponge wiping assembly, a filter cartridge, a filter residue collecting box and a water tank. The transmission lead screw is vertically installed in the water tank and is driven by the power source to rotate, the filter cylinder is coaxially embedded in the transmission lead screw, the filter residue collecting box is installed at the upper end of the water tank, the self-cleaning nut assembly is assembled on the transmission lead screw through a nut of the self-cleaning nut assembly and located below the self-sweeping sponge wiping assembly, and the self-sweeping sponge wiping assembly is coaxially embedded in the upper end of the transmission lead screw. A photocatalytic degradation chamber is arranged at the lower end part of the water tank, a water inlet pipe is arranged on the top surface of the water tank, a first electromagnetic valve is arranged on the water inlet pipe, a water outlet pipe is arranged at the lower end part of the water tank, and a biosensor and a second electromagnetic valve are arranged on the water outlet pipe. The aquaculture tail water purification device can effectively complete purification work of aquaculture tail water.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture tail water purification treatment, and in particular to a reciprocating self-cleaning photocatalytic device and method for purifying aquaculture tail water. Background Art

[0002] During the aquaculture process, a large amount of antibiotics will remain in the water, which will harm the health of aquatic organisms. Therefore, the antibiotics in the water need to be treated every once in a while.

[0003] Generally, when factories deal with antibiotics in the tail water of aquaculture, they adopt the preliminary treatment method of centrifugal filtration to achieve the initial treatment effect. However, there are a lot of impurities and waste in the water of aquaculture. During centrifugal filtration, the impurities on the inner wall of the filter cartridge accumulate together, making the filtration system easily clogged.

[0004] Therefore, there is an urgent need for a reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a compact and reliable reciprocating self-cleaning photocatalytic device and method for purifying aquaculture tail water, which can efficiently complete the purification of aquaculture tail water.

[0006] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water, comprising: a transmission screw, a self-cleaning nut assembly, a self-sweeping sponge assembly, a filter cartridge, a filter residue collection box, an inlet pipe, an outlet pipe, an antibiotic sensor, a first solenoid valve, a second solenoid valve, a power source and a water tank; the transmission screw is vertically installed in the water tank and driven to rotate by the power source; the filter cartridge is coaxially nested on the transmission screw and rotates synchronously with the transmission screw, and the body of the filter cartridge The filter holes are evenly distributed, with an open top and a sealed bottom, but a through hole is opened in the center for the transmission screw to pass through; the filter residue collection box is installed at the upper end of the water tank and surrounds the upper end of the entire filter cartridge; the self-cleaning nut assembly is assembled on the transmission screw through its nut and is located below the self-sweeping sponge wiper assembly. The self-cleaning nut assembly moves axially on the transmission screw as the transmission screw rotates. A plurality of first support rods extending outward are fixed on the side surface of the nut at intervals along its circumference, and the free end of each first support rod is installed A scraper shovel is provided for scraping off the filter residue accumulated on the inner wall of the filter cartridge and temporarily storing it therein; a one-way filter valve is installed at the end of the scraper shovel away from its inlet, and the one-way filter valve can only be opened toward the inlet; the self-sweeping sponge wipe assembly is coaxially nested at the upper end of the transmission screw and rotates synchronously with the transmission screw; the self-sweeping sponge wipe assembly comprises a plurality of second support rods extending outwardly, a sponge wipe is installed at the free end of each second support rod, and one sponge wipe corresponds to one scraper shovel, for removing the filter residue stored in the scraper shovel from the scraper The shovel inlet sweeps out to the filter residue collection box; a photocatalytic degradation chamber is provided at the lower end of the water tank, which is used to photocatalytically degrade the tail water after being filtered by the filter cartridge; a water inlet pipe for the tail water to enter the filter cartridge is installed on the top surface of the water tank, and a first solenoid valve for controlling the water inlet switch is installed on the water inlet pipe; a water outlet pipe is installed at the lower end of the water tank, and an antibiotic sensor for detecting the antibiotic concentration of the tail water after photocatalytic degradation and a second solenoid valve for controlling the water outlet switch are respectively installed on the water outlet pipe.

[0007] Furthermore, the scraper shovel is an arc-shaped structure that matches the curvature of the inner wall of the filter cartridge, and comprises an arc-shaped front plate, an arc-shaped rear plate, an arc-shaped bottom plate, a scraping edge and a one-way filter valve. The arc-shaped front plate and the arc-shaped rear plate are respectively fixed on the front and rear sides of the arc-shaped bottom plate to form a cavity for storing filter residues. The scraping edge is docked on one side of the arc-shaped rear plate and moves toward the arc-shaped front plate to scrape off the filter residues accumulated on the inner wall of the filter cartridge. The one-way filter valve is hinged on the other side of the arc-shaped rear plate.

[0008] Furthermore, the sponge is an arc-shaped structure that matches the shape of the inner cavity of the scraper shovel, and the bottom angle of the side facing the one-way filter valve of the corresponding scraper shovel is cut off to form a bevel. The other side of the sponge is a vertical side, so that when the self-cleaning nut assembly moves upward and contacts the sponge, the filter residue in the scraper shovel will not be accidentally removed. When the self-cleaning nut assembly moves downward, the sponge rotates in the opposite direction synchronously with the transmission screw, and the one-way filter valve of the adjacent scraper shovel is knocked open by the vertical side of the sponge, and then the filter residue in the scraper shovel is swept out of the scraper shovel.

[0009] Furthermore, the self-sweeping sponge wiper assembly also includes a base body, the base body is nested and fixed on the transmission screw rod, and the second support rods are fixed on the side surfaces of the base body at intervals along the circumference of the base body.

[0010] Furthermore, an open hole with a bottom opening is formed in the central part of the photocatalytic degradation chamber. The open hole is made of quartz glass. A photocatalytic reaction light source is installed in the open hole. The outside of the open hole is surrounded by a foam nickel mesh filled with catalyst. The catalyst is excited and releases active substances under the irradiation of the photocatalytic reaction light source, thereby degrading the antibiotics contained in the tail water.

[0011] Furthermore, it also includes an agitator, which is coaxially nested in the lower end of the transmission screw and located at the lower end of the water tank. The agitator rotates synchronously with the transmission screw and is used to continuously stir the tail water after filtering through the filter cartridge to promote the rate of the photocatalytic reaction.

[0012] Furthermore, the power source is a driving motor, and the power is transmitted to the transmission screw by meshing a first transmission gear installed on the motor shaft with a second transmission gear on the transmission screw.

[0013] Furthermore, the water tank is composed of an upper shell, a middle shell and a base which are sequentially spliced ​​from top to bottom, and they are detachably connected; wherein the self-sweeping sponge wiper assembly and the filter residue collection box are located in the upper shell, the filter cartridge is located in the upper shell and the middle shell, the base is composed of a photocatalytic degradation chamber and a closed cavity located at the top of the photocatalytic degradation chamber, the closed cavity is embedded in a groove at the bottom center of the middle shell, the shape and size of the groove match the closed cavity, the top surface of the photocatalytic degradation chamber is provided with a plurality of vertical water pipes connected thereto, and the bottom of the middle shell is provided with a A plurality of through holes connected one by one with the plurality of vertical water pipes allow the tail water filtered in the filter cartridge to flow into the photocatalytic degradation chamber for photocatalytic reaction; the drive motor, the first transmission gear and the second transmission gear are located in a closed cavity; the top end of the transmission screw rod passes upward through the top surface of the upper shell and is connected to the upper shell by a deep groove ball bearing; the bottom end of the transmission screw rod passes downward through the upper shell, the middle shell and the closed cavity in turn and extends into the photocatalytic degradation chamber; the transmission screw rod and the top surface of the closed cavity are connected by a thrust ball bearing; the agitator is placed in the photocatalytic degradation chamber and is located above the open hole.

[0014] Furthermore, the filter cartridge is a double-layer filter cartridge, and the agitator is an impeller.

[0015] The present invention also provides a reciprocating self-cleaning photocatalytic method for purifying aquaculture tail water, which is implemented based on the above-mentioned reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water. The specific process is as follows: First, the driving motor drives the transmission screw to rotate, and at the same time drives the filter cartridge to rotate. Under the action of centrifugal force, some solid particles and impurities with high density in the tail water entering the filter cartridge adhere to the inner wall of the filter cartridge to form filter residue. The self-cleaning nut assembly moves axially upward from the bottom of the filter cartridge under the drive of the transmission screw, and the scraper shovel of the self-cleaning nut assembly contacts the inner wall of the filter cartridge to scrape off the filter residue on the inner wall of the filter cartridge, so that the filter residue is collected in the scraper shovel. When the nut of the self-cleaning nut assembly is about to reach the top of the transmission screw, the driving motor is powered off, the transmission screw slows down until it stops, and finally the scraper shovel is close to the corresponding sponge. Then, the driving motor is reversed, and the transmission screw, filter cartridge and sponge rotate in the opposite direction. The sponge and adjacent scrapers The one-way filter valve of the material shovel is contacted to knock the one-way filter valve open, and the filter residue in the scraper shovel is swept out. The filter residue is discharged into the filter residue collection box due to the action of inertia; the self-cleaning nut assembly scrapes the filter residue accumulated on the inner wall of the filter cartridge once for each forward and reverse rotation of the drive motor, and the tail water filtered in the filter cartridge flows into the photocatalytic degradation chamber for photocatalytic degradation. The catalyst is excited and releases active substances under the irradiation of the photocatalytic reaction light source, thereby degrading the antibiotics contained in the tail water. At the same time, the agitator continuously stirs the tail water to promote the rate of the photocatalytic reaction. The antibiotic sensor detects whether the antibiotic concentration of the treated tail water meets the standard. If it meets the standard, the tail water is discharged, and if it does not meet the standard, the photocatalytic degradation continues.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The self-cleaning nut assembly designed in the present invention adopts a mode of cooperating with the screw rod. When centrifugal filtration is performed, the filter residue accumulated on the inner wall of the filter cartridge can be continuously scraped off, and the filter residue on the inner wall of the filter cartridge will be scraped off once each time the driving motor rotates forward and reversely, thereby avoiding the reduction of filtering effect due to the accumulation of filter residue on the inner wall of the filter cartridge.

[0017] 2. The present invention uses an antibiotic sensor connected to a solenoid valve, so that the antibiotic concentration of the tail water after the photocatalytic reaction can be detected in real time. If the concentration meets the standard, the tail water can flow out of the device for the next step of treatment. If the concentration does not meet the standard, the solenoid valve is closed, and the tail water in the device continues to photocatalytically degrade until the concentration meets the standard.

[0018] 3. The present invention adopts a driving motor to drive the transmission screw to rotate, so that the power output works synergistically with filtering and photocatalysis, reducing space costs, and realizing the integration of filtering, cleaning and detection without the need for human control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a reciprocating self-cleaning photocatalytic device.

[0020] Figure 2It is a partial cross-sectional view of a reciprocating self-cleaning photocatalytic device.

[0021] Figure 3 It is a schematic diagram of the structure of the self-cleaning nut assembly.

[0022] Figure 4 A cross-sectional view of the base. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0024] Example 1 See also Figures 1 to 4As shown, this embodiment discloses a reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water, comprising: a transmission screw 1, a self-cleaning nut assembly, a self-sweeping sponge assembly, a filter cartridge 4, a filter residue collection box 5, a water inlet pipe 6, a water outlet pipe 7, an antibiotic sensor 8, a first solenoid valve 9, a second solenoid valve 10, a power source 11 and a water tank; the transmission screw 1 is vertically installed in the water tank and driven to rotate by the power source 11; the filter cartridge 4 is coaxially nested on the transmission screw 1 and rotates synchronously with the transmission screw 1, and the body of the filter cartridge 4 is evenly distributed with filter holes, and its top is opened The bottom is sealed but a through hole is opened in the center for the transmission screw 1 to pass through; the filter residue collection box 5 is installed at the upper end of the water tank and surrounds the upper end of the entire filter cartridge 4; the self-cleaning nut assembly is assembled on the transmission screw 1 through its nut 202 and is located below the self-sweeping sponge assembly. The self-cleaning nut assembly moves axially on the transmission screw 1 as the transmission screw 1 rotates. Four first support rods extending outward are fixed on the side of the nut 202 at uniform intervals along its circumference. A scraper shovel 201 is installed at the free end of each first support rod for scraping the filter cartridge 4, the filter residue accumulated on the inner wall is scraped off and temporarily stored therein, and a one-way filter valve 201-5 is installed at the end of the scraper 201 away from its inlet, and the one-way filter valve 201-5 can only be opened toward the inlet; the self-sweeping sponge wipe assembly is coaxially nested at the upper end of the transmission screw 1 and rotates synchronously with the transmission screw 1, and the self-sweeping sponge wipe assembly includes four second support rods extending outwards, and a sponge 301 is installed at the free end of each second support rod, and one sponge 301 corresponds to one scraper 201, which is used to remove the filter residue stored in the scraper 201 from The scraper shovel 201 sweeps out the inlet to the filter residue collection box 5; the lower end of the water tank is provided with a photocatalytic degradation chamber 12, which is used to photocatalytically degrade the tail water after being filtered by the filter cartridge 4; the top surface of the water tank is provided with an inlet pipe 6 for the tail water to enter the filter cartridge 4, and the inlet pipe 6 is provided with a first solenoid valve 9 for controlling the water inlet switch; the lower end of the water tank is provided with a water outlet pipe 7, and the water outlet pipe 7 is respectively provided with an antibiotic sensor 8 for detecting the antibiotic concentration of the tail water after the photocatalytic degradation and a second solenoid valve 10 for controlling the water outlet switch.

[0025] Specifically, the scraper 201 is an arc-shaped structure that matches the curvature of the inner wall of the filter cartridge 4, and comprises an arc-shaped front plate 201-1, an arc-shaped rear plate 201-2, an arc-shaped bottom plate 201-3, a scraping edge 201-4 and a one-way filter valve 201-5. The arc-shaped front plate 201-1 and the arc-shaped rear plate 201-2 are respectively fixed on the front and rear sides of the arc-shaped bottom plate 201-3, and a cavity for storing filter residue is formed therebetween. The scraping edge 201-4 is docked on one side of the arc-shaped rear plate 201-2 and moves toward the arc-shaped front plate 201-1 to scrape off the filter residue accumulated on the inner wall of the filter cartridge 4. The one-way filter valve 201-5 is hinged on the other side of the arc-shaped rear plate 201-2.

[0026] Specifically, the sponge 301 is an arc-shaped structure that matches the inner cavity shape of the scraper shovel 201, and the bottom angle on the side facing the one-way filter valve 201-5 of the corresponding scraper shovel 201 is cut off to form a bevel. The other side of the sponge 301 is a vertical side, so that when the self-cleaning nut assembly moves upward and contacts the sponge 301, the filter residue in the scraper shovel 201 will not be mistakenly removed. When the self-cleaning nut assembly moves downward, the sponge 301 rotates in the opposite direction synchronously with the transmission screw 1, and the one-way filter valve 201-5 of the adjacent scraper shovel 201 is knocked open by the vertical side of the sponge 301, and then the filter residue in the scraper shovel 201 is swept out of the scraper shovel 201.

[0027] Specifically, the self-sweeping sponge wiper assembly further comprises a base body 302 , wherein the base body 302 is nested and fixed on the transmission screw rod 1 , and the second support rods are fixed on the side surface of the base body 302 at uniform intervals along the circumference of the base body 302 .

[0028] Specifically, an open hole 1201 with a bottom opening is formed in the central portion of the photocatalytic degradation chamber 12. The open hole 1201 is made of quartz glass. A photocatalytic reaction lamp source 1202 is installed in the open hole 1201. The outside of the open hole 1201 is surrounded by a foam nickel mesh 1203 filled with a catalyst. The catalyst is excited and releases active substances under the irradiation of the photocatalytic reaction lamp source 1202, thereby degrading the antibiotics contained in the tail water.

[0029] Specifically, it also includes an agitator 13, which is coaxially nested in the lower end of the transmission screw 1 and located at the lower end of the water tank. The agitator 13 rotates synchronously with the transmission screw 1 and is used to continuously stir the tail water filtered by the filter cartridge 4 to promote the rate of the photocatalytic reaction.

[0030] Specifically, the stirrer 13 is an impeller.

[0031] Specifically, the power source 11 is a driving motor, and the power is transmitted to the transmission screw 1 through a first transmission gear 14 installed on the motor shaft thereof meshing with a second transmission gear 15 on the transmission screw 1 .

[0032] Specifically, the water tank is composed of an upper shell 16, a middle shell 17 and a base 18 which are sequentially spliced ​​from top to bottom, and they are detachably connected; wherein the self-sweeping sponge wiper assembly and the filter residue collection box 5 are located in the upper shell 16, the filter cartridge 4 is located in the upper shell 16 and the middle shell 17, the base 18 is composed of a photocatalytic degradation chamber 12 and a closed cavity 19 located at the top of the photocatalytic degradation chamber 12, the closed cavity 19 is embedded in a groove at the bottom center of the middle shell 17, the shape and size of the groove match the closed cavity 19, the top surface of the photocatalytic degradation chamber 12 is provided with a plurality of vertical water pipes 1204 connected thereto, and the bottom of the middle shell 17 is provided with a plurality of The through holes of the multiple vertical water pipes 1204 connected one by one allow the tail water filtered in the filter cartridge 4 to flow into the photocatalytic degradation chamber 12 for photocatalytic reaction. The drive motor, the first transmission gear 14 and the second transmission gear 15 are located in the closed cavity 19. The top end of the transmission screw 1 passes through the top surface of the upper shell 16 upward and is connected to the upper shell 16 by a deep groove ball bearing 20. The bottom end of the transmission screw 1 passes through the upper shell 16, the middle shell 17 and the closed cavity 19 downward in sequence and then extends into the photocatalytic degradation chamber 12. The transmission screw 1 is connected to the top surface of the closed cavity 19 by a thrust ball bearing 21. The agitator 13 is placed in the photocatalytic degradation chamber 12 and is located above the open hole 1201.

[0033] Specifically, the filter cartridge 4 is a double-layer filter cartridge, that is, it has two layers of filter walls, inner and outer.

[0034] Example 2 This embodiment discloses a reciprocating self-cleaning photocatalytic method for purifying aquaculture tail water, which is implemented based on the reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water described in Example 1. The specific process is as follows: First, the driving motor drives the transmission screw 1 to rotate, and at the same time drives the filter cartridge 4 to rotate. Under the action of centrifugal force, some solid particles and impurities with high density in the tail water entering the filter cartridge 4 adhere to the inner wall of the filter cartridge 4 to form filter residues. The self-cleaning nut assembly moves axially upward from the bottom of the filter cartridge 4 under the drive of the transmission screw 1, and the scraper shovel 201 of the self-cleaning nut assembly contacts the inner wall of the filter cartridge 4 to scrape off the filter residue on the inner wall of the filter cartridge 4, so that the filter residue is collected in the scraper shovel 201. When the nut 202 of the self-cleaning nut assembly is about to reach the top of the transmission screw 1, the driving motor is powered off, the transmission screw 1 slows down until it stops, and finally the scraper shovel 201 is tightly attached to the corresponding sponge 301; then, the driving motor is reversed, and the transmission screw 1, filter cartridge 4 and sponge 301 rotate in the opposite direction. The one-way filter valve 201-5 adjacent to the scraper 201 is contacted to knock the one-way filter valve 201-5 open, and the filter residue in the scraper 201 is swept out. The filter residue is discharged into the filter residue collection box 5 due to the effect of inertia; the self-cleaning nut assembly scrapes the filter residue accumulated on the inner wall of the filter cartridge 4 once for each forward and reverse rotation of the drive motor, and the tail water filtered in the filter cartridge 4 flows into the photocatalytic degradation chamber 12 for photocatalytic degradation. The catalyst is excited and releases active substances under the irradiation of the photocatalytic reaction light source 1202, thereby degrading the antibiotics contained in the tail water. At the same time, the agitator 13 continuously stirs the tail water to promote the rate of the photocatalytic reaction. The treated tail water is then detected by the antibiotic sensor 8 to see if its antibiotic concentration meets the standard. If it meets the standard, the tail water is discharged; if it does not meet the standard, the photocatalytic degradation continues.

[0035] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water, characterized in that: include: A transmission screw (1), a self-cleaning nut assembly, a self-sweeping sponge assembly, a filter cartridge (4), a filter residue collection box (5), a water inlet pipe (6), a water outlet pipe (7), an antibiotic sensor (8), a first solenoid valve (9), a second solenoid valve (10), a power source (11) and a water tank; the transmission screw (1) is vertically installed in the water tank and driven to rotate by the power source (11); the filter cartridge (4) is coaxially nested on the transmission screw (1) and rotates synchronously with the transmission screw (1); the body of the filter cartridge (4) is evenly distributed with filter holes, the top is open, the bottom is sealed, but a hole is opened at the center for the transmission screw (1) to pass through. ) through a through hole; the filter residue collection box (5) is mounted on the upper end of the water tank and surrounds the upper end of the entire filter cartridge (4); the self-cleaning nut assembly is assembled on the transmission screw (1) through its nut (202) and is located below the self-sweeping sponge assembly; the self-cleaning nut assembly moves axially on the transmission screw (1) as the transmission screw (1) rotates; a plurality of first support rods extending outwardly are fixed at intervals along the circumference of the nut (202) on the side surface; a scraper shovel (201) is mounted on the free end of each first support rod for scraping off the filter residue accumulated on the inner wall of the filter cartridge (4) and temporarily storing it In the embodiment, a one-way filter valve (201-5) is installed at one end of the scraper shovel (201) away from its inlet, and the one-way filter valve (201-5) can only be opened in the inlet direction; the self-sweeping sponge wipe assembly is coaxially nested in the upper end of the transmission screw (1) and rotates synchronously with the transmission screw (1); the self-sweeping sponge wipe assembly comprises a plurality of second support rods extending outwards, each second support rod having a sponge wipe (301) installed at the free end thereof, and one sponge wipe (301) corresponds to one scraper shovel (201), and is used to sweep the filter residue stored in the scraper shovel (201) from the inlet of the scraper shovel (201) to the outlet of the scraper shovel (201). The water tank is provided with a photocatalytic degradation chamber (12) at the lower end thereof, for photocatalytically degrading the tail water after being filtered by the filter cartridge (4); a water inlet pipe (6) for supplying the tail water to enter the filter cartridge (4) is installed on the top surface of the water tank, and a first solenoid valve (9) for controlling the water inlet switch is installed on the water inlet pipe (6); a water outlet pipe (7) is installed at the lower end thereof, and an antibiotic sensor (8) for detecting the antibiotic concentration of the tail water after photocatalytic degradation and a second solenoid valve (10) for controlling the water outlet switch are installed on the water outlet pipe (7).

2. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 1, characterized in that: The scraper (201) is an arc-shaped structure that matches the arc of the inner wall of the filter cartridge (4), and comprises an arc-shaped front plate (201-1), an arc-shaped rear plate (201-2), an arc-shaped bottom plate (201-3), a scraping edge (201-4) and a one-way filtering valve (201-5); the arc-shaped front plate (201-1) and the arc-shaped rear plate (201-2) are respectively fixed to the front and rear sides of the arc-shaped bottom plate (201-3), and a cavity for storing filter residue is formed therebetween; the scraping edge (201-4) is butted against one side of the arc-shaped rear plate (201-2) and moves toward the arc-shaped front plate (201-1) to scrape off filter residue accumulated on the inner wall of the filter cartridge (4); and the one-way filtering valve (201-5) is hinged to the other side of the arc-shaped rear plate (201-2).

3. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 2, characterized in that: The sponge (301) is an arc-shaped structure that matches the inner cavity shape of the scraper (201), and the bottom angle of the side facing the one-way filter valve (201-5) of the corresponding scraper (201) is cut off to form a bevel. The other side of the sponge (301) is a vertical side surface, so that when the self-cleaning nut assembly moves upward and contacts the sponge (301), the filter residue in the scraper (201) will not be mistakenly removed. When the self-cleaning nut assembly moves downward, the sponge (301) rotates in the opposite direction synchronously with the transmission screw (1), and knocks open the one-way filter valve (201-5) of the adjacent scraper (201) through the vertical side surface of the sponge (301), and then sweeps the filter residue in the scraper (201) out of the scraper (201).

4. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 3, characterized in that: The self-sweeping sponge wiper assembly further comprises a base body (302), wherein the base body (302) is nested and fixed on the transmission screw rod (1), and the second support rods are fixed on the side surface of the base body (302) at intervals along the circumference of the base body (302).

5. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 4, characterized in that: An open hole (1201) with a bottom opening is formed at the central portion of the photocatalytic degradation chamber (12); the open hole (1201) is made of quartz glass; a photocatalytic reaction light source (1202) is installed in the open hole (1201); a foam nickel mesh (1203) filled with a catalyst surrounds the outside of the open hole (1201); the catalyst is excited and releases active substances under the irradiation of the photocatalytic reaction light source (1202), thereby degrading the antibiotics contained in the tail water.

6. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 5, characterized in that: It also includes a stirrer (13), which is coaxially nested in the lower end of the transmission screw (1) and located at the lower end of the water tank. The stirrer (13) rotates synchronously with the transmission screw (1) and is used to continuously stir the tail water after being filtered by the filter cartridge (4) to promote the rate of the photocatalytic reaction.

7. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 6, characterized in that: The power source (11) is a driving motor, and the power is transmitted to the transmission screw (1) through the first transmission gear (14) mounted on the motor shaft thereof meshing with the second transmission gear (15) on the transmission screw (1).

8. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 7, characterized in that: The water tank is composed of an upper shell (16), a middle shell (17) and a base (18) which are sequentially spliced ​​from top to bottom, and are detachably connected. The self-sweeping sponge wiper assembly and the filter residue collection box (5) are located in the upper shell (16), the filter cartridge (4) is located in the upper shell (16) and the middle shell (17), the base (18) is composed of a photocatalytic degradation chamber (12) and a closed cavity (19) located at the top of the photocatalytic degradation chamber (12), the closed cavity (19) is inserted into a groove at the center of the bottom of the middle shell (17), the shape and size of the groove match the closed cavity (19), the top surface of the photocatalytic degradation chamber (12) is provided with a plurality of vertical water pipes (1204) connected thereto, and the bottom of the middle shell (17) is provided with a plurality of vertical water pipes (1204) connected to the plurality of vertical water pipes (1204) The through holes of the vertical water pipes (1204) are connected one by one, so that the tail water filtered in the filter cartridge (4) flows into the photocatalytic degradation chamber (12) for photocatalytic reaction. The drive motor, the first transmission gear (14) and the second transmission gear (15) are located in the closed cavity (19). The top end of the transmission screw (1) passes through the top surface of the upper shell (16) upwards and is connected to the upper shell (16) by a deep groove ball bearing (20). The bottom end of the transmission screw (1) passes through the upper shell (16), the middle shell (17) and the closed cavity (19) in sequence downwards and extends into the photocatalytic degradation chamber (12). The transmission screw (1) and the top surface of the closed cavity (19) are connected by a thrust ball bearing (21). The agitator (13) is placed in the photocatalytic degradation chamber (12) and is located above the open hole (1201).

9. A reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to claim 8, characterized in that: The filter cartridge (4) is a double-layer filter cartridge, and the agitator (13) is an impeller.

10. A reciprocating self-cleaning photocatalytic method for purifying aquaculture tail water, characterized in that: The reciprocating self-cleaning photocatalytic device for purifying aquaculture tail water according to any one of claims 1 to 9 is implemented as follows: First, the drive motor drives the transmission screw (1) to rotate, and at the same time drives the filter cartridge (4) to rotate. Under the action of centrifugal force, some solid particles and impurities with high density in the tail water entering the filter cartridge (4) adhere to the inner wall of the filter cartridge (4) to form filter residue. The self-cleaning nut assembly moves axially upward from the bottom of the filter cartridge (4) under the drive of the transmission screw (1). The scraper (201) of the self-cleaning nut assembly contacts the inner wall of the filter cartridge (4) to scrape off the filter residue on the inner wall of the filter cartridge (4), so that the filter residue is collected in the scraper (201). When the nut (202) of the self-cleaning nut assembly is about to reach the top of the transmission screw (1), the drive motor is powered off, the transmission screw (1) slows down until it stops, and finally the scraper (201) is in close contact with the corresponding sponge (301). Then, the drive motor is reversed, the transmission screw (1), the filter cartridge (4) and the sponge (301) rotate in the opposite direction, and the sponge The scraper (301) contacts the one-way filter valve (201-5) of the adjacent scraper (201), knocks the one-way filter valve (201-5) open, and sweeps out the filter residue in the scraper (201). The filter residue is discharged into the filter residue collection box (5) due to the effect of inertia. The self-cleaning nut assembly scrapes the filter residue accumulated on the inner wall of the filter cartridge (4) once each time the drive motor rotates forward and reversely. The tail water filtered in the filter cartridge (4) flows into the photocatalytic degradation chamber (12) for photocatalytic degradation. The catalyst is excited and releases active substances under the irradiation of the photocatalytic reaction light source (1202), thereby degrading the antibiotics contained in the tail water. At the same time, the stirrer (13) continuously stirs the tail water to promote the rate of the photocatalytic reaction. The treated tail water is then detected by the antibiotic sensor (8) to see whether its antibiotic concentration meets the standard. If it meets the standard, the tail water is discharged. If it does not meet the standard, the photocatalytic degradation continues.

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