A bacteria-algae biofilm reactor for purifying aquaculture tail water

Abstract

The application discloses a bacteria-algae biofilm reactor for purifying aquaculture tail water, and relates to the technical field of aquaculture.The bacteria-algae biofilm reactor comprises a treatment pool, a driving mechanism, a biofilm reaction mechanism, a connecting shaft mechanism and a taking and placing mechanism.The driving mechanism comprises driving shafts and driving discs.There are two groups of driving shafts, and each group is evenly arranged at the top of a main body fixing frame.The driving discs are arranged at one end of the driving shafts close to the middle of the treatment pool.The single-shaft rubber roller is driven by the friction force generated by the self weight of the wet canvas belt, the bottom multi-shaft fixation is completely cancelled, the structure is simplified, and the installation is convenient.When the biofilm dies and the carrier needs to be replaced due to the idle period or water quality impact, the group of reaction mechanisms can be hoisted out and the canvas belt can be replaced on line without stopping the whole reactor, the remaining mechanisms continue to operate without being affected, and the quick replacement of the carrier and the continuous treatment of the system are realized.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, specifically to a biofilm reactor for purifying aquaculture wastewater. Background Technology

[0002] Aquaculture plays a vital role in ensuring the supply of high-quality protein and increasing fishermen's income. However, the problem of excessive nitrogen and phosphorus emissions caused by aquaculture wastewater, especially wastewater from high-level seawater aquaculture ponds, is becoming increasingly serious. Uneaten feed and excrement are the main causes of pollution. Feed contributes 68% to 92% of the nitrogen and 73% to 91% of the phosphorus in the aquaculture system, but only a small portion of it is converted into biomass. A large amount of nitrogen and phosphorus enters the water body. Existing models such as composite artificial wetlands, three ponds and two dams, bottom discharge, and factory-style recirculating water systems are difficult to apply on a large scale in high-level aquaculture scenarios with scarce land and high discharge intensity due to high operating costs, large land occupation, or unstable treatment effects.

[0003] Algae-bacterial water treatment technology combines the ability of bacteria to degrade organic matter with the ability of algae to absorb nitrogen and phosphorus, making it an effective means of enhancing the self-purification of water bodies. However, the difficulty in harvesting algal cells from suspended systems has led people to turn to algae-bacterial biofilm technology. Rotating algae-bacterial biofilm reactors (RABs) attach algae-bacterial biofilms to flexible carriers such as canvas. The carrier alternately contacts sewage and air, and after rotating out of the water, it obtains better light and gas exchange conditions. It has significant advantages such as high biomass, easy collection, and fast pollutant removal rate.

[0004] However, the increasingly prominent intermittent operation and shock problems in actual aquaculture have exposed fatal flaws in existing RAB reactors. Currently, almost all RAB reactors adopt a single-carrier multi-axis or single-carrier bi-axis fixing method. The carrier is fixed by multiple shafts, which is complicated to install. Once started, the carrier replacement is extremely difficult. Species such as Litopenaeus vannamei are farmed two to three times a year, with a 2 to 3 month idle period between crops. When there is no tailwater supply, the bacterial and algal biofilm on the carrier is very easy to dry up and die. The drastic changes in water volume and quality during the farming period, from a small amount of low concentration in the early stage to a large amount of high concentration in the later stage, often cause large-scale biofilm shedding and death. Once the biofilm on the carrier dies, due to the extreme difficulty of disassembling and assembling the multi-axis structure, replacing the carrier requires shutting down the entire reactor and disassembling the transmission system. The entire replacement and re-attaching and restarting process often takes several months, which is simply not able to meet the tailwater treatment needs of the next farming season, resulting in long-term idleness or interruption of treatment. Summary of the Invention

[0005] The purpose of this invention is to provide a biofilm reactor for purifying aquaculture wastewater, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a bacterial and algal biofilm reactor for purifying aquaculture wastewater, comprising a treatment tank, wherein a main body fixing frame is fixedly installed at the top left and right sides of the treatment tank, and further comprising a drive mechanism, a biofilm reaction mechanism, a coupling mechanism and a pick-and-place mechanism; The drive mechanism includes a drive shaft and a drive disk. There are two sets of drive shafts, which are evenly arranged at the top of the two main body fixing frames. The drive disk is located at the end of the drive shaft near the middle of the processing pool. The biofilm reaction mechanism includes a drive shaft, a rubber roller, and a canvas mesh belt. There are several drive shafts, which are evenly arranged between two sets of drive shafts. The rubber roller is fixedly sleeved on the drive shaft. The top end of the canvas mesh belt is sleeved on the rubber roller, and the bottom end is located inside the treatment tank. The drive shaft drives the rubber roller to rotate. After the biofilm is attached to the canvas mesh belt, it is moistened by the effluent inside the treatment tank. The friction generated by its own gravity is driven by the rubber roller to continuously treat the effluent inside the treatment tank. The coupling mechanism includes a connecting disc, friction blocks, and movable wheels. Two connecting discs are provided on each transmission shaft and are fixedly installed at both ends of the transmission shaft. Several friction blocks are evenly distributed in each connecting disc. Two movable wheels are provided on each transmission shaft and are movably disposed at both ends of the transmission shaft. By connecting the connecting disc to the drive disc and driving the movable wheels to move towards the drive disc, the friction blocks are driven to extend out of the connecting disc and connect with the drive disc, so that the drive disc drives the connecting disc to rotate synchronously. The pick-and-place mechanism includes a suspension rod and a hook. There are two suspension rods, which are located above the two ends of a drive shaft. The hook is located at the bottom end of the suspension rod. By attaching the hook to the movable wheel, the two suspension rods are driven to move, thereby driving the movable wheel to move.

[0007] Preferably, the drive mechanism includes a bearing seat and transmission gears. There are several bearing seats, which are divided into two groups and are evenly fixedly installed on the top of the two main body fixed frames. The drive shaft is movably installed in the bearing seat. There are several transmission gears, which are fixedly sleeved on the end of the drive shaft away from the drive disc.

[0008] Preferably, the drive mechanism includes a dual-axis motor, drive gears, and transmission chains. The dual-axis motor is fixedly mounted on the top side of a main fixed frame. There are two drive gears, which are respectively fixedly sleeved on the two output shafts of the dual-axis motor. There are two transmission chains, which are respectively meshed and movably sleeved on two sets of transmission gears and drive gears.

[0009] Preferably, the coupling mechanism includes a spring groove, a spring rod, a first return spring, and a limiting bracket. The spring groove is located on the side of the friction block near the drive shaft. The spring rod is fixedly installed in the middle of the inside of the spring groove. The first return spring is movably sleeved on the spring rod. One end of the limiting bracket is inserted into the spring groove and movably sleeved outside the spring rod. The end of the limiting bracket located outside the spring groove is fixedly installed on the inner wall of the connecting plate.

[0010] Preferably, the coupling mechanism includes trapezoidal blocks, a synchronizing disc, and a movable rod. There are two sets of trapezoidal blocks, which are evenly and movably installed inside both ends of the transmission shaft. The synchronizing disc is fixedly installed at the end of each set of trapezoidal blocks away from the connecting disc and is movably installed inside the transmission shaft. The movable rod is fixedly installed in the middle of the side of the synchronizing disc away from the connecting disc and is movably installed inside the transmission shaft.

[0011] Preferably, the coupling mechanism includes a movable groove, a limiting rod, and a second return spring. The movable groove is opened at both ends of the transmission shaft. The limiting rod is inserted into the movable groove and passes through the middle of the movable rod. The second return spring is movably sleeved on the outside of the movable rod and located inside the end of the transmission shaft. The movable wheel is movably sleeved on both ends of the limiting rod located outside the movable groove.

[0012] Preferably, the picking and placing mechanism includes a lifting frame and a horizontal cylinder. There are two lifting frames, which are respectively arranged on the left and right sides of the treatment pool, and the horizontal cylinder is fixedly installed between the top ends of the two lifting frames.

[0013] Preferably, the picking and placing mechanism includes a central gear, a central motor, and a reciprocating frame. The central gear is movably installed in the middle of the inside of the horizontal cylinder. The central motor is fixedly installed in the middle of the top of the horizontal cylinder, and the output shaft is fixedly installed in the middle of the inside of the central gear. There are two reciprocating frames, which are movably installed at both ends of the inside of the horizontal cylinder, and the side closer to the central gear is movably connected to the central gear through meshing. The suspension rod is movably connected to the end of the reciprocating frame located outside the horizontal cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes the frictional force generated by the weight of a wet canvas mesh belt via a single-axis rubber roller, completely eliminating the need for multi-axis fixing at the bottom. This simplifies the structure and makes installation convenient. When the biofilm dies during idle periods or due to water quality shocks and requires carrier replacement, a movable lifting frame and hook system are used. A centrally located motor drives the reciprocating frame to move the movable wheels inward, causing the trapezoidal block to release the friction block limit in the connecting plate. Under the action of the spring, the friction block automatically retracts, and the connecting plate and drive plate instantly disengage. The entire reaction mechanism can be lifted out online and the canvas mesh belt replaced without shutting down the entire reactor. The remaining mechanisms continue to operate unaffected, achieving rapid carrier replacement and continuous system treatment. This design effectively overcomes the key defects of existing rotating algae biofilm reactors, such as the difficulty of replacement due to multi-axis fixing and the need to shut down and restart after biofilm death, which takes several months. It can fully adapt to the realities of discontinuous aquaculture cycles, long idle periods between crops, and large fluctuations in water volume and quality. It significantly shortens the facility's idle recovery time, greatly reduces the labor intensity and time cost of operation and maintenance, and ensures the long-term, efficient, and stable operation of the effluent treatment facility. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure is provided for embodiments of the present invention; Figure 2 A schematic diagram of the driving mechanism provided in an embodiment of the present invention; Figure 3 A schematic diagram of a biomembrane reaction mechanism provided in an embodiment of the present invention; Figure 4 This is a partial cross-sectional schematic diagram of the coupling mechanism provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the friction block structure provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the pick-and-place mechanism provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the internal structure of the horizontal cylinder provided in an embodiment of the present invention.

[0016] In the diagram: 1. Treatment tank; 2. Main fixed frame; 3. Drive mechanism; 301. Shaft seat; 302. Drive shaft; 303. Drive disc; 304. Transmission gear; 305. Dual-shaft motor; 306. Drive gear; 307. Transmission chain; 4. Biofilm reaction mechanism; 401. Transmission shaft; 402. Rubber roller; 403. Canvas mesh belt; 5. Coupling mechanism; 501. Connecting disc; 502. Friction block; 503. Spring groove; 504. Spring rod; 505. First return spring; 506. Limiting frame; 507. Trapezoidal block; 508. Synchronous disc; 509. Movable rod; 510. Movable groove; 511. Limiting rod; 512. Second return spring; 513. Movable wheel; 6. Picking and placing mechanism; 601. Lifting frame; 602. Horizontal cylinder; 603. Central gear; 604. Central motor; 605. Reciprocating frame; 606. Suspension rod; 607. Hook. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This embodiment describes a bacterial and algal biofilm reactor for purifying aquaculture wastewater, such as... Figures 1 to 7 As shown, it includes a treatment tank 1, with a main fixing frame 2 fixedly installed at the top left and right sides of the treatment tank 1, and also includes a drive mechanism 3, a biofilm reaction mechanism 4, a coupling mechanism 5 and a pick-and-place mechanism 6. The drive mechanism 3 includes a drive shaft 302 and a drive disk 303. There are two sets of drive shafts 302, which are evenly arranged at the top of the two main body fixing frames 2. The drive disk 303 is located at the end of the drive shaft 302 near the middle of the processing pool 1.

[0019] In this embodiment, as Figure 2 As shown, the drive mechanism 3 includes a bearing seat 301 and a transmission gear 304. There are several bearing seats 301, which are divided into two groups and are evenly fixedly installed on the top of the two main body fixing frames 2. The drive shaft 302 is movably installed in the bearing seat 301. There are several transmission gears 304, which are fixedly sleeved on the end of the drive shaft 302 away from the drive disk 303. The drive shaft 302 drives the drive disk 303 to rotate, causing the connecting disk 501 to rotate with the drive disk 303.

[0020] In this embodiment, as Figure 2As shown, the drive mechanism 3 includes a dual-axis motor 305, a drive gear 306, and a transmission chain 307. The dual-axis motor 305 is fixedly installed on the top side of a main body fixed frame 2. There are two drive gears 306, which are respectively fixedly sleeved on the two output shafts of the dual-axis motor 305. There are two transmission chains 307, which are respectively meshed and movably sleeved on two sets of transmission gears 304 and drive gears 306. By starting the dual-axis motor 305, the drive gear 306 is driven to rotate, which in turn drives the drive shaft 302, which is connected to the transmission gear 304, to rotate via the transmission chain 307.

[0021] At other levels, this embodiment also provides a biomembrane reaction mechanism 4, such as... Figure 3 As shown, the biofilm reaction mechanism 4 includes a drive shaft 401, a rubber roller 402, and a canvas mesh belt 403. There are several drive shafts 401, which are evenly arranged between two sets of drive shafts 302. The rubber roller 402 is fixedly sleeved on the drive shaft 401. The top end of the canvas mesh belt 403 is sleeved on the rubber roller 402, and the bottom end is located inside the treatment tank 1. The drive shaft 401 drives the rubber roller 402 to rotate. After the biofilm is attached to the canvas mesh belt 403, it is moistened by the effluent inside the treatment tank 1. The friction generated by its own gravity is driven by the rubber roller 402 to continuously treat the effluent inside the treatment tank 1.

[0022] In other aspects, this embodiment also provides a coupling mechanism 5, such as... Figure 4 As shown, the coupling mechanism 5 includes a connecting disc 501, a friction block 502, and a movable wheel 513. Two connecting discs 501 are provided on each transmission shaft 401 and are fixedly installed at both ends of the transmission shaft 401. Several friction blocks 502 are evenly arranged in each connecting disc 501. Two movable wheels 513 are provided on each transmission shaft 401 and are movably arranged at both ends of the transmission shaft 401. By connecting the connecting disc 501 to the driving disc 303 and driving the movable wheel 513 to move closer to the driving disc 303, the friction block 502 is driven to extend out from the connecting disc 501 and connect with the driving disc 303, so that the driving disc 303 drives the connecting disc 501 to rotate synchronously.

[0023] In this embodiment, as Figure 5As shown, the coupling mechanism 5 includes a spring groove 503, a spring rod 504, a first return spring 505, and a limiting frame 506. The spring groove 503 is opened on the side of the friction block 502 near the transmission shaft 401. The spring rod 504 is fixedly installed in the middle of the inside of the spring groove 503. The first return spring 505 is movably sleeved on the spring rod 504. One end of the limiting frame 506 is inserted into the spring groove 503 and movably sleeved on the outside of the spring rod 504. The other end of the limiting frame 506 located outside the spring groove 503 is fixedly installed on the inner wall of the connecting plate 501. The friction block 502 is retracted into the connecting plate 501 by the elastic force of the first reset spring 505, thereby desynchronizing the connecting plate 501 from the drive plate 303.

[0024] In this embodiment, as Figure 4 As shown, the coupling mechanism 5 includes trapezoidal blocks 507, synchronous discs 508, and movable rods 509. There are two sets of trapezoidal blocks 507, which are evenly and movably installed inside both ends of the transmission shaft 401. The synchronous discs 508 are fixedly installed at the end of each set of trapezoidal blocks 507 away from the connecting disc 501, and are movably installed inside the transmission shaft 401. The movable rods 509 are fixedly installed in the middle of the side of the synchronous disc 508 away from the connecting disc 501, and are movably installed inside the transmission shaft 401. The moving rod 509 drives the synchronous disc 508 and the trapezoidal block 507 to move as a whole, thereby releasing the friction block 502 inside the connecting disc 501 from its limit.

[0025] In this embodiment, as Figure 4 As shown, the coupling mechanism 5 includes a movable groove 510, a limiting rod 511, and a second return spring 512. The movable groove 510 is opened at both ends of the transmission shaft 401. The limiting rod 511 is inserted into the movable groove 510 and passes through the middle of the movable rod 509. The second return spring 512 is movably sleeved on the outside of the movable rod 509 and is located inside the end of the transmission shaft 401. The movable wheel 513 is movably sleeved on both ends of the limiting rod 511 located outside the movable groove 510. When the movable wheel 513 moves, it drives the limit rod 511 to move simultaneously within the movable groove 510, and the limit rod 511 drives the movable rod 509 to move.

[0026] At other levels, this embodiment also provides a pick-and-place mechanism 6, such as... Figure 6 As shown, the pick-and-place mechanism 6 includes a suspension rod 606 and a hook 607. There are two suspension rods 606, which are located above the two ends of a drive shaft 401 respectively. The hook 607 is located at the bottom end of the suspension rod 606. By attaching the hook 607 to the movable wheel 513, and then driving the two suspension rods 606 to move, the movable wheel 513 can be moved.

[0027] In this embodiment, as Figure 6 As shown, the pick-and-place mechanism 6 includes a lifting frame 601 and a horizontal cylinder 602. There are two lifting frames 601, which are respectively arranged on the left and right sides of the processing pool 1. The horizontal cylinder 602 is fixedly installed between the top ends of the two lifting frames 601. The horizontal cylinder 602 is moved above the set of biofilm reaction mechanisms 4 to be replaced by the movable lifting frame 601, which facilitates the replacement without affecting the normal operation of the other biofilm reaction mechanisms 4, and also makes it convenient for the staff to carry out the replacement work.

[0028] In this embodiment, as Figure 7 As shown, the pick-and-place mechanism 6 includes a central gear 603, a central motor 604, and a reciprocating frame 605. The central gear 603 is movably installed in the middle of the inside of the horizontal cylinder 602. The central motor 604 is fixedly installed in the middle of the top of the horizontal cylinder 602, and its output shaft is fixedly installed in the middle of the inside of the central gear 603. There are two reciprocating frames 605, which are movably installed at both ends inside the horizontal cylinder 602, and the side closer to the central gear 603 is movably connected to the central gear 603 through meshing. The suspension rod 606 is movably connected to the end of the reciprocating frame 605 located outside the horizontal cylinder 602. The central gear 603 drives the two reciprocating frames 605 to move simultaneously, thereby adjusting the distance between the two suspension rods 606 so that the two hooks 607 are aligned with the positions of the two movable wheels 513 on the corresponding biofilm reaction mechanism 4. The suspension rods 606 are rotated so that the hooks 607 can enter the gap between the two adjacent biofilm reaction mechanisms 4. Then, the lifting frame 601 is driven to lower the hooks 607 so that the hooks 607 are fitted onto the movable wheels 513. Then, the lifting frame 601 is driven to rise so that the movable wheels 513 and the hooks 607 are tightly fitted together.

[0029] Working principle: In use, the biofilm is attached to the canvas mesh belt 403, and the bottom end of the canvas mesh belt 403 is placed in the treatment tank 1. The dual-shaft motor 305 is started, which drives the drive gear 306 to rotate. The drive chain 307 drives the drive shaft 302 connected to the drive gear 304 to rotate. The drive shaft 302 drives the drive disc 303 to rotate, so that the connecting disc 501 rotates with the drive disc 303. The connecting disc 501 drives the drive shaft 401 to rotate, and the drive shaft 401 drives the rubber roller 402 to rotate. After the biofilm is attached to the canvas mesh belt 403, it is moistened by the effluent inside the treatment tank 1. The friction generated by its own gravity is driven by 402 to continuously treat the effluent inside the tank 1. When the canvas mesh belt 403 needs to be replaced, push the lifting frame 601 to the set of biofilm reaction mechanisms 4 to be replaced, start the central motor 604 to drive the central gear 603 to rotate, and drive the two reciprocating frames 605 to move simultaneously through the central gear 603 to adjust the distance between the two suspension rods 606 so that the two hooks 607 are aligned with the positions of the two movable wheels 513 on the set of biofilm reaction mechanisms 4. Rotate the suspension rods 606 so that the hooks 607 can enter the gap between the two adjacent sets of biofilm reaction mechanisms 4, and then drive the lifting frame 601 to lower the hooks 607 so that the hooks 607 are fitted on the movable wheels 513. Then drive the lifting frame 601 to rise so that the movable wheels 513 and the hooks 607 are tightly fitted. Then start the central motor 604 to drive the central gear 603 to rotate, so that the two reciprocating frames 605 retract into the horizontal cylinder 602. At this time, the two movable wheels 513 are moved in the direction of the canvas mesh belt 403. When the movable wheel 513 moves, it drives the limit rod 511 to move simultaneously within the movable groove 510. The limit rod 511 drives the movable rod 509 to move, and the movable rod 509 drives the synchronous disc 508 and the trapezoidal block 507 to move as a whole. This causes the friction block 502 inside the connecting disc 501 to be released from its limit. Through the elastic force of the first return spring 505, the friction block 502 is retracted into the connecting disc 501, thus desynchronizing the synchronous linkage between the connecting disc 501 and the drive disc 303. After the drive lifting frame 601 rises, causing the biofilm reaction mechanism 4 to rise as a whole, the movable lifting frame 601 moves the biofilm reaction mechanism 4 out so that the canvas mesh belt 403 with the biofilm attached can be replaced without affecting the operation of the other biofilm reaction mechanisms 4.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biofilm reactor for purifying aquaculture wastewater, comprising a treatment tank (1), wherein a main fixing frame (2) is fixedly installed at the top left and right sides of the treatment tank (1), characterized in that, It also includes a drive mechanism (3), a biofilm reaction mechanism (4), a coupling mechanism (5), and a pick-and-place mechanism (6). The drive mechanism (3) includes a drive shaft (302) and a drive disk (303). There are two sets of drive shafts (302), which are evenly arranged at the top of the two main body fixing frames (2). The drive disk (303) is located at one end of the drive shaft (302) near the middle of the processing pool (1). The biofilm reaction mechanism (4) includes a drive shaft (401), a rubber roller (402), and a canvas mesh belt (403). There are several drive shafts (401) and they are evenly arranged between two sets of drive shafts (302). The rubber roller (402) is fixedly sleeved on the drive shaft (401). The top end of the canvas mesh belt (403) is sleeved on the rubber roller (402), and the bottom end is located inside the treatment tank (1). The drive shaft (401) drives the rubber roller (402) to rotate. After the biofilm is attached to the canvas mesh belt (403), it is moistened by the effluent inside the treatment tank (1) and driven by the friction generated by its own gravity by the rubber roller (402) to continuously treat the effluent inside the treatment tank (1). The coupling mechanism (5) includes a connecting disc (501), a friction block (502), and a movable wheel (513). Two connecting discs (501) are provided on each transmission shaft (401) and are fixedly installed at both ends of the transmission shaft (401). Several friction blocks (502) are evenly arranged in each connecting disc (501). Two movable wheels (513) are provided on each transmission shaft (401) and are movably arranged at both ends of the transmission shaft (401). The pick-and-place mechanism (6) includes a suspension rod (606) and a hook (607). There are two suspension rods (606), which are located above the two ends of a drive shaft (401). The hook (607) is located at the bottom end of the suspension rod (606).

2. The biofilm reactor for purifying aquaculture wastewater according to claim 1, characterized in that: The drive mechanism (3) includes a bearing seat (301) and a transmission gear (304). There are several bearing seats (301), which are divided into two groups and are evenly fixedly installed on the top of the two main body fixed frames (2). The drive shaft (302) is movably installed in the bearing seat (301). There are several transmission gears (304), which are fixedly sleeved on the end of the drive shaft (302) away from the drive disk (303).

3. The biofilm reactor for purifying aquaculture wastewater according to claim 2, characterized in that: The drive mechanism (3) includes a dual-axis motor (305), a drive gear (306), and a transmission chain (307). The dual-axis motor (305) is fixedly installed on the top side of a main body fixed frame (2). There are two drive gears (306), which are respectively fixedly sleeved on the two output shafts of the dual-axis motor (305). There are two transmission chains (307), which are respectively meshed and movably sleeved on two sets of transmission gears (304) and drive gears (306).

4. The bacterial and algal biofilm reactor for purifying aquaculture wastewater according to claim 3, characterized in that: The coupling mechanism (5) includes a spring groove (503), a spring rod (504), a first reset spring (505), and a limiting bracket (506). The spring groove (503) is opened on the side of the friction block (502) near the transmission shaft (401). The spring rod (504) is fixedly installed in the middle of the inside of the spring groove (503). The first reset spring (505) is movably sleeved on the spring rod (504). One end of the limiting bracket (506) is inserted into the spring groove (503) and movably sleeved outside the spring rod (504). The end of the limiting bracket (506) located outside the spring groove (503) is fixedly installed on the inner wall of the connecting plate (501).

5. The bacterial and algal biofilm reactor for purifying aquaculture wastewater according to claim 4, characterized in that: The coupling mechanism (5) includes trapezoidal blocks (507), a synchronous disc (508), and a movable rod (509). There are two sets of trapezoidal blocks (507), which are evenly and movably installed inside both ends of the transmission shaft (401). The synchronous disc (508) is fixedly installed at one end of each set of trapezoidal blocks (507) away from the connecting disc (501) and is movably installed inside the transmission shaft (401). The movable rod (509) is fixedly installed in the middle of the side of the synchronous disc (508) away from the connecting disc (501) and is movably installed inside the transmission shaft (401).

6. The biofilm reactor for purifying aquaculture wastewater according to claim 5, characterized in that: The coupling mechanism (5) includes a movable groove (510), a limiting rod (511), and a second return spring (512). The movable groove (510) is opened at both ends of the transmission shaft (401). The limiting rod (511) is inserted into the movable groove (510) and passes through the middle of the movable rod (509). The second return spring (512) is movably sleeved on the outside of the movable rod (509) and located inside the end of the transmission shaft (401). The movable wheel (513) is movably sleeved on both ends of the limiting rod (511) located outside the movable groove (510).

7. The biofilm reactor for purifying aquaculture wastewater according to claim 6, characterized in that: The pick-and-place mechanism (6) includes a lifting frame (601) and a horizontal cylinder (602). There are two lifting frames (601), which are respectively located on the left and right sides of the treatment pool (1). The horizontal cylinder (602) is fixedly installed between the tops of the two lifting frames (601).

8. The bacterial and algal biofilm reactor for purifying aquaculture wastewater according to claim 7, characterized in that: The picking and placing mechanism (6) includes a central gear (603), a central motor (604), and a reciprocating frame (605). The central gear (603) is movably installed in the middle of the inside of the horizontal cylinder (602). The central motor (604) is fixedly installed in the middle of the top of the horizontal cylinder (602), and the output shaft is fixedly installed in the middle of the inside of the central gear (603). There are two reciprocating frames (605), which are movably installed at both ends inside the horizontal cylinder (602), and the side closer to the central gear (603) is movably connected to the central gear (603) through meshing. The suspension rod (606) is movably connected to the end of the reciprocating frame (605) located outside the horizontal cylinder (602).

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