A circulating aquaculture system capable of multi-stage treatment of wastewater or sewage

Abstract

The present invention discloses a circulating aquaculture system capable of multi-stage treatment of wastewater or sewage, comprising a culture pond and a reservoir. A primary water treatment mechanism is provided within the culture pond, a secondary water treatment mechanism is provided between the drainage end of the culture pond and the water inlet end of the reservoir, and a tertiary water treatment mechanism is provided between the water inlet end of the culture pond and the drainage end of the reservoir; the system is used to chemically treat the sewage in the reservoir. The circulating aquaculture system of the present invention is provided with a three-stage water treatment mechanism, and the additional secondary water treatment mechanism removes small particle flocculated impurities in the sewage through a physical filtration method, thereby more thoroughly treating solid impurities in the sewage or wastewater. This makes it more convenient for the sewage treatment device to complete the water treatment in the subsequent treatment process, and also makes the water treatment more thorough, making the entire water treatment process more complete and stable.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and in particular to a circulating aquaculture system capable of performing multi-stage treatment on wastewater or sewage. Background Art

[0002] The recirculating aquaculture system uses a series of water treatment units to treat the wastewater generated in the aquaculture pond and then recycle it for reuse. Its main principle is to integrate advanced technologies in disciplines such as environmental engineering, civil engineering, modern biology, and electronic information to remove harmful pollutants such as leftover bait and feces, ammonia nitrogen (TAN), and nitrite nitrogen from the aquaculture water, thereby purifying the aquaculture environment.

[0003] This type of traditional recirculating aquaculture system uses a water purification device to directly extract and treat the aquaculture wastewater, and then discharges the treated water into the aquaculture pond for recycling. Although such a sewage treatment system can also be set to a multi-stage treatment mode in the water purification device, this method of directly using an integrated device for treatment does not clearly distinguish between each level of treatment. Since the sewage treatment process is different, the efficiency of each level of treatment is also different. Therefore, such an integrated treatment device cannot clearly check between each level of treatment. In this way, it is impossible to clearly find the problem of the corresponding treatment mechanism during the long water treatment process, which is very troublesome when performing system calibration. In addition, the existing water treatment system only treats solid impurities in sewage or wastewater through structures such as grid filters. In this way, it is easy to cause impurities to clog the filter holes during the impurity removal process, which hinders the water filtration process and affects the overall treatment progress. Summary of the Invention

[0004] The object of the present invention is to provide a circulating aquaculture system capable of performing multi-stage treatment on wastewater or sewage, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a circulating aquaculture system capable of multi-stage treatment of wastewater or sewage, comprising a culture pond and a reservoir, wherein a primary water treatment mechanism is provided inside the culture pond, a secondary water treatment mechanism is provided between the drainage end of the culture pond and the water inlet end of the reservoir, and a tertiary water treatment mechanism is provided between the water inlet end of the culture pond and the drainage end of the reservoir;

[0006] The primary water treatment mechanism includes a shielding component and a scraping component, the scraping component is used to scrape away debris on the top of the shielding component, the shielding component includes a shielding plate, the scraping component includes a rotating screw and a scraping plate, and the bottom of the scraping plate is symmetrically provided with multiple scraping hooks in the horizontal and longitudinal directions;

[0007] The secondary water treatment mechanism includes a percolation plate for performing physical filtration treatment of wastewater;

[0008] The tertiary water treatment mechanism includes a sewage treatment device for chemically treating the sewage in the water reservoir.

[0009] Preferably, a slag discharge port is opened on one side of the bottom of the breeding pond, a sealing plate is slidably arranged in the slag discharge port, a handle is fixedly connected to the middle part of one side of the sealing plate, and the top and bottom of the other side of the sealing plate are fixedly connected to fastening plates, and the two fastening plates are fixedly connected to one side of the breeding pond.

[0010] Preferably, one side of the baffle is fixedly connected to the inner wall of one side of the bottom of the breeding pond, a plurality of water leakage holes are arranged in an array on the top of the baffle, a placement plate is fixedly connected to one side of the bottom of the breeding pond, a servo motor is provided on the top of the placement plate, an output end of the servo motor is fixedly connected to one end of one of the rotating screws, and a transmission belt is sleeved between one end of the two rotating screws.

[0011] Preferably, movable chutes are provided on the front and back inner walls of the middle part of the breeding pond, the two ends of the scraper are respectively slidably connected in the two movable chutes, and the two rotating screws are respectively rotatably connected with the two movable chutes.

[0012] Preferably, both ends of the scraper are provided with threaded through grooves, and the two ends of the scraper are respectively threadedly connected through the threaded through grooves and the threaded ends of the two rotating screws, and the top and bottom ends of the two movable slides are provided with limiting slides, and the top and bottom ends of both ends of the scraper are fixedly connected with limiting sliders, and the four limiting sliders are respectively slidably connected with the four limiting slides.

[0013] Preferably, the inner walls on one side of the two movable slide grooves are provided with through grooves, one end of the two rotating screws is respectively rotatably connected with the two through grooves, the inner walls in the middle of the two through grooves are provided with limiting ring grooves, the outer walls of the two rotating screws are respectively provided with limiting rings, and the two limiting rings are respectively rotatably connected with the two limiting ring grooves.

[0014] Preferably, a plurality of drainage holes are provided at the bottom end of the breeding pond, a drainage pipe is provided in each of the plurality of drainage holes, the bottoms of the plurality of drainage pipes are inserted into the top of the infiltration plate, a plurality of water guide pipes are provided at the bottom of the infiltration plate, and a control valve is provided at the top of the plurality of drainage pipes.

[0015] Preferably, the filtration plate includes a first gauze layer, a pebble layer, a quartz sand layer, an activated carbon layer, a second gauze layer and a fluffy cotton layer; the pebble layer is arranged at the bottom end of the first gauze layer, the quartz sand layer is arranged at the bottom end of the pebble layer, the activated carbon layer is arranged at the bottom end of the quartz sand layer, the second gauze layer is arranged at the bottom end of the activated carbon layer, and the fluffy cotton layer is arranged at the bottom end of the second gauze layer.

[0016] Preferably, the water inlet end of the sewage treatment device is provided with a pumping pipe, one end of which is inserted into the bottom of the water reservoir, and the discharge end of the sewage treatment device is provided with a water supply pipe, one end of which is inserted into the top of the breeding pond.

[0017] Preferably, a plurality of rotating openings are opened at the bottom end of the scraper, and the inner walls of the front and back sides of the plurality of rotating openings are opened with support rotation grooves, the tops of the plurality of scraper hooks are respectively rotatably set in the plurality of rotating openings, the front and back sides of the tops of the plurality of scraper hooks are fixedly connected with support rotation rods, and the plurality of support rotation rods are respectively rotatably inserted and connected in the plurality of support rotation grooves, the outer walls of the plurality of support rotation rods are respectively sleeved with torsion springs, and the plurality of torsion springs are respectively set in the plurality of support rotation grooves.

[0018] Technical effects and advantages of the present invention:

[0019] (1) The circulating aquaculture system of the present invention is provided with a three-stage water treatment mechanism, and the additional secondary water treatment mechanism removes small particle flocculation impurities in the sewage by a physical filtration method, so that the solid impurities in the sewage or wastewater are treated more thoroughly, so that in the subsequent treatment process, the sewage treatment device can complete the water treatment more conveniently, and also makes the water treatment more thorough, making the entire water treatment process more complete and stable;

[0020] (2) The present invention is provided with three water treatment mechanisms, each of which is independently designed. In particular, the primary water treatment mechanism is used to scrape and remove large-volume solid impurities. Through the reciprocating movement of the scraper, the scraper hook follows the scraper to scrape and remove the solid impurities. This method can not only speed up the removal speed, but also avoid the accumulation of solids to block the shielding plate, making the water filtration process smoother and more stable, thus ensuring that the primary water treatment mechanism can effectively complete the treatment task;

[0021] (3) The three groups of water treatment mechanisms of the present invention are all independently controlled and used. When the system is inspected and verified, the treatment problem can be found more quickly, so that the inspection of each part can be completed more conveniently. Moreover, after the system has been treating water for a long time, the problem node can be found more quickly, so that the water treatment mechanism can be repaired more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the system composition principle of the present invention;

[0023] Figure 2 Schematic diagram of the system structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 A schematic diagram of the structure at point A in the middle;

[0025] Figure 4 Schematic diagram of the top cross-section structure of the aquaculture pond of the present invention;

[0026] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0027] Figure 6 It is a side cross-sectional view of the structure of the connection between the culture pond and the rotating screw rod of the present invention;

[0028] Figure 7 Schematic diagram of the interlayer structure distribution of the filtration plate of the present invention;

[0029] Figure 8 This is a cross-sectional view of the structure of the scraper of the present invention;

[0030] Figure 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at point C in the middle.

[0031] In the figure: 1. Breeding pond; 101. Placement plate; 102. Blocking plate; 103. Handle; 104. Fastening plate; 105. Shielding plate; 106. Leakage hole; 107. Slag outlet; 108. Moving chute; 109. Through-hole; 2. Filter plate; 201. First gauze layer; 202. Pebble layer; 203. Quartz sand layer; 204. Activated carbon layer; 205. Second gauze layer; 206. 6. Fluffy cotton layer; 3. Water guide pipe; 301. Control valve; 302. Drain pipe; 4. Reservoir; 5. Sewage treatment device; 501. Pumping pipe; 502. Water delivery pipe; 6. Scraper; 601. Limiting slider; 602. Rotating mouth; 7. Scraping hook; 701. Supporting rotating rod; 702. Torsion spring; 8. Servo motor; 801. Rotating screw; 802. Limiting collar; 803. Transmission belt. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The present invention provides Figures 1-9 A circulating aquaculture system capable of multi-stage treatment of wastewater or sewage is shown, comprising a culture pond 1 and a reservoir 4. A primary water treatment mechanism is provided inside the culture pond 1, a secondary water treatment mechanism is provided between the drainage end of the culture pond 1 and the water inlet end of the reservoir 4, and a tertiary water treatment mechanism is provided between the water inlet end of the culture pond 1 and the drainage end of the reservoir 4.

[0034] like Figure 3 As shown, a slag discharge port 107 is opened on one side of the bottom of the breeding pond 1, and a sealing plate 102 is slidably arranged in the slag discharge port 107. A handle 103 is fixedly connected to the middle of one side of the sealing plate 102, and the top and bottom of the other side of the sealing plate 102 are fixedly connected to fastening plates 104. The two fastening plates 104 are fixedly connected to one side of the breeding pond 1.

[0035] The height of the opening on the side of the slag discharge port 107 close to the inside of the breeding pond 1 is one-third of the height of the opening on the outside. In this way, after the solid waste is scraped into the slag discharge port 107, it can be accumulated at the slag discharge port 107, which is convenient for subsequent cleaning of solid debris. The fastening plate 104 is used to vertically fix the sealing plate 102 in the slag discharge port 107 to seal the entire breeding pond 1 to prevent the breeding pond 1 from leaking when in use.

[0036] The primary water treatment mechanism includes a shielding component and a scraping component. The scraping component is used to scrape away debris on the top of the shielding component, such as Figure 4 As shown, the shielding assembly includes a shielding plate 105, as shown in FIG. Figure 5 As shown, the scraping assembly includes a rotating screw 801 and a scraper 6, as shown in FIG. Figure 8 As shown, a plurality of scraping hooks 7 are symmetrically arranged at the bottom of the scraper 6 in the horizontal and longitudinal directions.

[0037] The scraper hook 7 has a tadpole-shaped structure, and its inward bend is directed toward the slag discharge port 107. In this way, when the scraper hook 7 is reset, the curved arc of the outer wall can avoid, to the greatest extent, causing the solid impurities to be scraped away from the slag discharge port 107, so that the scraping of solid impurities can be more orderly concentrated in the slag discharge port 107.

[0038] like Figure 3 As shown, one side of the shielding plate 105 is fixedly connected to the inner wall of the bottom side of the culture pond 1. The top of the shielding plate 105 is provided with a plurality of drainage holes 106 in an array. The drainage holes 106 are arranged at the bottom of the culture pond 1 to separate the solid impurities and water inside the pond water when the culture pond 1 is drained, so that the solid impurities with a diameter of more than 0.5 mm are blocked at the top of the shielding plate 105. Figure 5As shown, a placement plate 101 is fixedly connected to one side of the bottom of the breeding pond 1, a servo motor 8 is provided on the top of the placement plate 101, the output end of the servo motor 8 is fixedly connected to one end of one of the rotating screws 801, and a transmission belt 803 is sleeved between one end of the two rotating screws 801.

[0039] The shielding plate 105 and the rotating screw 801 are both tilted at an angle of 10°-15°, and the end close to the slag discharge port 107 is lower than the end away from the slag discharge port 107, so that a slag discharge slope can be provided, making it more convenient for the scraper 6 to scrape solid debris.

[0040] The front and back inner walls of the middle part of the culture pond 1 are both provided with movable chutes 108 , and the two ends of the scraper 6 are respectively slidably connected in the two movable chutes 108 , and the two rotating screws 801 are respectively rotatably connected with the two movable chutes 108 .

[0041] like Figure 6 As shown, both ends of the scraper 6 are provided with threaded grooves, and the two ends of the scraper 6 are respectively threadedly connected through the threaded grooves and the threaded ends of the two rotating screws 801, and the top and bottom ends of the two movable slides 108 are provided with limiting slides, and the top and bottom ends of both ends of the scraper 6 are fixedly connected with limiting sliders 601, and the four limiting sliders 601 are respectively slidably connected with the four limiting slides.

[0042] The cooperation between the limiting slider 601 and the limiting groove guides and limits the movement of the scraper 6, so that the scraper 6 follows the rotation of the rotating screw 801 and can only move in a straight line without causing rotation, so that the rotating screw 801 controls the moving direction of the scraper 6 by rotating in the opposite direction.

[0043] The inner wall of one side of the two movable slides 108 is provided with a through slot 109, and one end of the two rotating screws 801 is respectively rotatably connected with the two through slots 109. The inner wall of the middle part of the two through slots 109 is provided with a limiting ring groove, and the outer wall of the two rotating screws 801 is provided with a limiting collar 802, and the two limiting collars 802 are respectively rotatably connected with the two limiting ring grooves.

[0044] The limiting ring 802 fits tightly with the limiting ring groove, and the contact surface is smooth. This can ensure that the rotating screw 801 can rotate synchronously with the output end of the servo motor 8, while limiting the position of the rotating screw 801 so that it can only maintain rotation in the original position, thereby ensuring the stable movement of the scraper 6.

[0045] like Figure 9As shown, a plurality of rotating openings 602 are provided at the bottom end of the scraper 6, and support rotation grooves are provided on the inner walls of the front and back sides of the plurality of rotating openings 602. The tops of the plurality of scraper hooks 7 are respectively rotatably set in the plurality of rotating openings 602, and the front and back sides of the tops of the plurality of scraper hooks 7 are fixedly connected with support rotation rods 701, and the plurality of support rotation rods 701 are respectively rotatably inserted and connected in the plurality of support rotation grooves. The outer walls of the plurality of support rotation rods 701 are respectively sleeved with torsion springs 702, and the plurality of torsion springs 702 are respectively set in the plurality of support rotation grooves.

[0046] like Figure 7 As shown, the secondary water treatment mechanism includes a filtration plate 2 for physical filtration treatment of wastewater. The filtration plate 2 includes a first gauze layer 201, a pebble layer 202, a quartz sand layer 203, an activated carbon layer 204, a second gauze layer 205 and a fluffy cotton layer 206.

[0047] The first gauze layer 201, the pebble layer 202, the quartz sand layer 203, the activated carbon layer 204, the second gauze layer 205 and the fluffy cotton layer 206 together constitute a physical filtration mechanism. When sewage mixed with fine particles or flocculent impurities passes through this mechanism, these impurities can be blocked and filtered by the first gauze layer 201, the pebble layer 202 and the quartz sand layer 203, and then the activated carbon layer 204 adsorbs and filters the impurities in the water. The final second gauze layer 205 and the fluffy cotton layer 206 are protection mechanisms to prevent the activated carbon layer 204 from insufficient absorption or saturation of adsorption before performing a third impurity filtration.

[0048] A plurality of drainage holes are provided at the bottom of the culture pond 1, and a drainage pipe 302 is provided in each of the drainage holes. The bottoms of the plurality of drainage pipes 302 are interspersed and arranged on the top of the infiltration plate 2. A plurality of water guide pipes 3 are provided at the bottom of the infiltration plate 2. A control valve 301 is provided on the top of each of the plurality of drainage pipes 302. The control valve 301 is used to control the opening and closing of each drainage pipe 302.

[0049] like Figure 7 As shown, the pebble layer 202 is arranged at the bottom end of the first gauze layer 201, the quartz sand layer 203 is arranged at the bottom end of the pebble layer 202, the activated carbon layer 204 is arranged at the bottom end of the quartz sand layer 203, the second gauze layer 205 is arranged at the bottom end of the activated carbon layer 204, and the fluffy cotton layer 206 is arranged at the bottom end of the second gauze layer 205.

[0050] The tertiary water treatment mechanism includes a sewage treatment device 5 for chemical treatment of sewage in the reservoir 4;

[0051] like Figure 2As shown, a pumping pipe 501 is provided at the water inlet end of the sewage treatment device 5, one end of which is inserted into the bottom of the water reservoir 4, and a water supply pipe 502 is provided at the discharge end of the sewage treatment device 5, one end of which is inserted into the top of the breeding pond 1.

[0052] Working principle of the present invention: Figures 1 to 9 , when using this system for recirculating aquaculture after multi-stage water treatment;

[0053] When water cleaning is required, the servo motor 8 is first started. The output end of the servo motor 8 drives the connected rotating screw 801 to rotate. At this time, under the transmission of the transmission belt 803, the two rotating screws 801 rotate synchronously. Under the cooperation of the threads, the two ends of the scraper 6 move along the rod walls of the two rotating screws 801, and at the same time drive the connected limiting slider 601 to slide synchronously in the corresponding limiting slot;

[0054] During the movement of the scraper 6, the scraper hook 7 at the bottom will be driven to move synchronously, so that the top of the baffle 105 will be scraped during the movement of the scraper hook 7. According to the structural design of the scraper hook 7, when the scraper hook 7 follows the scraper 6 to move toward the slag discharge port 107, the scraper hook 7 is blocked by the baffle 105 and is in a vertical state. At this time, the torsion spring 702 is in a twisted state, which can scrape away the debris at the leakage hole 106 and scrape the debris into the slag discharge port 107 according to the moving direction. When the scraper hook 7 moves away from the slag discharge port 107, the torsion spring 702 is forced to rotate the scraper hook 7 to a slightly bent state, so that the debris will not be scraped.

[0055] After the scraping work is completed, the multiple control valves 301 are opened, and the sewage and wastewater flow downward through the multiple drain pipes 302 at the bottom of the culture pond 1. At this time, the water flowing through the drain pipes 302 will penetrate into the percolation plate 2 for physical filtration and impurity removal. After physical filtration through the first gauze layer 201, the pebble layer 202, the quartz sand layer 203, the activated carbon layer 204, the second gauze layer 205 and the fluffy cotton layer 206 in sequence, the solid suspended impurities in the sewage and wastewater are adsorbed and removed;

[0056] After the sewage in the aquaculture pond 1 is discharged, the connection between the fastening plate 104 and the aquaculture pond 1 is opened, and then the blocking plate 102 is pulled out by the handle 103, and then the impurities and garbage accumulated in the slag discharge port 107 are removed. After the removal is completed, the blocking plate 102 is embedded in the slag discharge port 107, and then the fastening plate 104 and the aquaculture pond 1 are fixed;

[0057] The water flow is then directed through multiple water pipes 3 to the water reservoir 4 for collection. Finally, the sewage treatment device 5 extracts the wastewater after two-stage treatment from the water reservoir 4 for a third chemical treatment. After the chemical residues in the wastewater and sewage are removed, the treated water flow is pumped into the breeding pond 1 for use.

[0058] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A circulating aquaculture system capable of multi-stage treatment of wastewater or sewage, comprising a culture pond (1) and a reservoir (4), characterized in that: A primary water treatment mechanism is provided inside the aquaculture pond (1), a secondary water treatment mechanism is provided between the drainage end of the aquaculture pond (1) and the water inlet end of the water reservoir (4), and a tertiary water treatment mechanism is provided between the water inlet end of the aquaculture pond (1) and the drainage end of the water reservoir (4); The primary water treatment mechanism comprises a shielding component and a scraping component, wherein the scraping component is used to scrape off debris on the top of the shielding component, the shielding component comprises a shielding plate (105), and the top of the shielding plate (105) is provided with a plurality of water leakage holes (106) distributed in an array, the scraping component comprises a rotating screw (801) and a scraper (6), both ends of the scraper (6) are provided with threaded grooves, and the two ends of the scraper (6) are respectively threadedly connected through the threaded grooves and the threaded ends of the two rotating screws (801), and the bottom of the scraper (6) is provided with a plurality of scraping hooks (7) symmetrically arranged in the horizontal and longitudinal directions. The secondary water treatment mechanism comprises a percolation plate (2) for performing physical filtration treatment on the wastewater; The tertiary water treatment mechanism includes a sewage treatment device (5) for chemically treating the sewage in the water reservoir (4); The front and back inner walls of the middle portion of the culture pond (1) are both provided with movable chutes (108), the two ends of the scraper (6) are respectively slidably connected in the two movable chutes (108), and the two rotating screws (801) are respectively rotatably connected in the two movable chutes (108); The inner walls of one side of the two movable slides (108) are each provided with a through slot (109), one end of each of the two rotating screws (801) is respectively connected to the two through slots (109) through rotation, the inner walls of the middle portions of the two through slots (109) are each provided with a limiting ring groove, the outer walls of the two rotating screws (801) are each provided with a limiting collar (802), and the two limiting collars (802) are respectively connected to the two limiting ring grooves through rotation; The bottom of the culture pond (1) is provided with a plurality of drainage holes, each of which is provided with a drainage pipe (302), the bottoms of each of which is inserted into the top of the percolation plate (2), the bottom of which is provided with a plurality of water guide pipes (3), and the tops of each of which is provided with a control valve (301); The water inlet end of the sewage treatment device (5) is provided with a water pumping pipe (501), one end of which is inserted into the bottom of the water reservoir (4); the drainage end of the sewage treatment device (5) is provided with a water delivery pipe (502), one end of which is inserted into the top of the breeding pond (1); The bottom end of the scraper (6) is provided with a plurality of rotating openings (602), and the inner walls of the front and back sides of the plurality of rotating openings (602) are provided with support rotation grooves. The tops of the plurality of scraper hooks (7) are respectively rotatably arranged in the plurality of rotating openings (602), and the front and back sides of the tops of the plurality of scraper hooks (7) are fixedly connected with support rotation rods (701), and the plurality of support rotation rods (701) are respectively rotatably inserted and connected in the plurality of support rotation grooves. The outer walls of the plurality of support rotation rods (701) are respectively provided with torsion springs (702), and the plurality of torsion springs (702) are respectively arranged in the plurality of support rotation grooves.

2. A circulating aquaculture system capable of multi-stage treatment of wastewater or sewage according to claim 1, characterized in that: A slag discharge port (107) is provided on one side of the bottom of the culture pond (1), a blocking plate (102) is slidably provided in the slag discharge port (107), a handle (103) is fixedly connected to the middle of one side of the blocking plate (102), and a fastening plate (104) is fixedly connected to the top and bottom of the other side of the blocking plate (102), and both fastening plates (104) are fixedly connected to one side of the culture pond (1).

3. The circulating aquaculture system capable of multi-stage treatment of wastewater or sewage according to claim 1, characterized in that: One side of the shielding plate (105) is fixedly connected to the inner wall of one side of the bottom of the culture pond (1), and one side of the bottom of the culture pond (1) is fixedly connected to a placement plate (101). A servo motor (8) is provided at the top of the placement plate (101), and an output end of the servo motor (8) is fixedly connected to one end of one of the rotating screws (801). A transmission belt (803) is sleeved between one end of the two rotating screws (801).

4. The circulating aquaculture system capable of multi-stage treatment of wastewater or sewage according to claim 1, characterized in that: The top and bottom ends of the two movable slides (108) are both provided with limiting slides, and the top and bottom ends of both ends of the scraper (6) are both fixedly connected with limiting sliders (601), and the four limiting sliders (601) are respectively connected to the four limiting slides in a sliding manner.

5. The circulating aquaculture system capable of multi-stage treatment of wastewater or sewage according to claim 1, characterized in that: The filtration plate (2) comprises a first gauze layer (201), a pebble layer (202), a quartz sand layer (203), an activated carbon layer (204), a second gauze layer (205) and a fluffy cotton layer (206); The pebble layer (202) is arranged at the bottom end of the first gauze layer (201), the quartz sand layer (203) is arranged at the bottom end of the pebble layer (202), the activated carbon layer (204) is arranged at the bottom end of the quartz sand layer (203), the second gauze layer (205) is arranged at the bottom end of the activated carbon layer (204), and the fluffy cotton layer (206) is arranged at the bottom end of the second gauze layer (205).

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