Automatic pollution discharge mechanism for land-based round pool recirculating aquaculture

By designing an automatic sewage discharge mechanism in the land-based circular pond recirculating aquaculture system, and utilizing the bottom discharge pipe and siphon principle, combined with adjustable throttling valves and air throttling valves, the problems of low sewage discharge efficiency and poor stability in traditional systems are solved, achieving a highly efficient and stable automatic sewage discharge process, ensuring water quality and biological health.

CN224007549UActive Publication Date: 2026-03-20GUANGXI GUIBA AGRICULTURAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-13
Publication Date
2026-03-20

AI Technical Summary

Technical Problem

Traditional land-based circular pond recirculating aquaculture systems are inadequate in terms of wastewater discharge efficiency, stability, and automation. They also cannot accurately control water flow and pressure during the drainage process, leading to water waste and potential secondary pollution problems.

Method used

Design an automatic sewage discharge mechanism, including a bottom discharge pipe, a vent pipe, and a sewage discharge tank. The bottom discharge pipe is connected to the sewage discharge tank at an inclination angle of 15°-30°. Combined with an adjustable throttle valve and a throttle valve, it realizes automatic sewage discharge by using the siphon principle, and ensures stability and high efficiency by precisely controlling the water flow and air entry.

Benefits of technology

It significantly improves sewage discharge efficiency and system stability, reduces the need for manual intervention, saves water resources, ensures water cleanliness and the health of aquaculture organisms, and enhances the level of automation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of aquaculture equipment, in particular to an automatic pollution discharge mechanism for recirculating aquaculture in a land-based round pond, which comprises a land-based round pond body and a pollution discharge component matched with the land-based round pond body, and the pollution discharge component comprises a fish closestool, a bottom discharge pipe, a breather pipe and a pollution discharge pond which are arranged at the bottom of the land-based round pond body; an outer drainage pipe communicated with the interior of the pollution discharge pool is arranged on the pollution discharge pool, a water inlet pipe communicated with the interior of the land-based round pool body is arranged on the land-based round pool body, one end of the bottom discharge pipe is fixedly connected with the fish closestool through a sealing connecting piece, and the other end of the bottom discharge pipe is connected with the pollution discharge pool in a penetrating and inserting mode; and the other end of the ventilation pipe is fixedly connected with the bottom discharge pipe. According to the automatic pollution discharge mechanism for land-based round pool recirculating aquaculture, pipeline layout optimization and the siphon principle are adopted, efficient and automatic pollution discharge is achieved, the water discharge amount can be accurately controlled, water resources are saved, and the automatic pollution discharge mechanism is suitable for different aquaculture scales.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of aquaculture equipment, especially relates to a kind of for land-based round pool circulation

[0002] Automatic pollution discharge mechanism of aquaculture. BACKGROUND

[0003] In modern aquaculture field, land-based round pool cultivation mode is widely applied due to its small land area, convenient management and other

[0004] Advantages. However, a major challenge faced by this cultivation mode is that the bottom of pool is easy to accumulate

[0005] Impurities such as fish feces and uneaten feed residues, and these pollutants will seriously affect water quality if not cleaned in time, and further threaten the health of cultivated organisms. Due to the design limitation of traditional pollution discharge system, it performs poorly in efficiency, stability and automation degree, and often needs frequent manual intervention to ensure normal operation, in addition, traditional pollution discharge equipment usually cannot accurately control water flow and pressure during drainage process, which not only leads to water resource waste, but also may cause secondary pollution problem due to incomplete pollution discharge.

[0006]

[0007]

[0008]

[0009]

[0010] Therefore, we propose an automatic pollution discharge mechanism for land-based round pool circulation aquaculture. SUMMARY

[0011] The main purpose of the utility model is to provide an automatic pollution discharge mechanism for land-based round pool circulation aquaculture, which can effectively solve the problems in the background art.

[0012]

[0013] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0014] An automatic pollution discharge mechanism for land-based round pool circulation aquaculture, comprising a land-based round pool body and

[0015] A pollution discharge assembly adapted to the land-based round pool body, the pollution discharge assembly comprising a fish toilet, a bottom discharge pipe, an air pipe and a pollution discharge pool arranged at the bottom of the land-based round pool body;

[0016] The pollution discharge pool is provided with an external drain pipe communicating with the inside of the pollution discharge pool, and the land-based round pool body

[0017] is provided with a water inlet pipe communicating with the inside of the pollution discharge pool.

[0018] ​​​​​The bottom discharge pipe is connected with the fish toilet through a sealing rubber ring and a stainless steel fastening screw.

[0019] The bottom discharge pipe is connected with the fish toilet through a sealing rubber ring and a stainless steel fastening screw.

[0020] The bottom discharge pipe is connected with the fish toilet through a sealing rubber ring and a stainless steel fastening screw.

[0021] The bottom discharge pipe is connected with the fish toilet through a sealing rubber ring and a stainless steel fastening screw.

[0022] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0023] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0024] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0025] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0026] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0027] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0028] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0029] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0030] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0031] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0032] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0033] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0034] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0035] By adopting the above technical scheme: by setting a certain inclination angle, on the one hand, the gravity is utilized to make the sewage flow from the land-based circular pool body to the sewage pool more quickly and effectively, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate and avoid the problems of impact and abrasion caused by too fast flow rate, on the other hand, it is helpful to reduce the deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage.

[0036] The siphon is controlled to start and stop, ensures the stability and balance of the whole sewage process, and provides solid guarantee for efficient drainage

[0037] .

[0038] Preferably, the diameter of the land-based circular pool body is 8 meters, and the depth is 2.2 meters, the air pipe is arranged on the bottom of the land-based circular pool body, and the air pipe is connected with the bottom discharge pipe

[0039] The depth of the end of the air pipe inserted into the land-based circular pool body away from the sewage pool is 40 cm.

[0040] By adopting the above technical scheme: when the water level in the land-based circular pool body rises to or exceeds the preset

[0041] 1.8 m starting water level line, the siphon starts under the action of gravity, water flows out along the bottom discharge pipe, the air in the air pipe is exhausted to form a vacuum, and 0.08-0.1 MPa

[0042] suction is generated under the cooperation of atmospheric pressure and the vacuum environment in the pipe, and the tail water and impurities at the bottom of the pool are efficiently discharged.

[0043] Compared with the prior art, the utility model has the following beneficial effects:

[0044] 1、The utility model discloses a sewage system, which comprises a land-based circular pool body, a bottom discharge pipe and an air pipe.

[0045] 1、The utility model discloses a sewage system, which comprises a land-based circular pool body, a bottom discharge pipe and an air pipe.

[0046] The utility model optimizes the pipeline layout and adopts the siphon principle, significantly improves the efficiency and stability of the sewage system, utilizes the close connection between the bottom discharge pipe and the fish toilet, combines the adjustable throttle valve, ensures that the bottom sediments can be efficiently and stably transported to the sewage pool, realizes efficient sewage, and the like

[0047] Meanwhile, the design of the air pipe makes the siphon start and stop completely based on water level change, so that automatic circulation operation can be realized without manual intervention, and the automation level and operation stability of the system are greatly improved.

[0048] Compared with the prior art, the automatic sewage mechanism not only improves the sewage efficiency by 3-5 times, but also avoids errors and unstable factors caused by frequent manual operation, so that the water quality and biological health in the whole breeding process are guaranteed.

[0049] 2、The utility model discloses a sewage system, which comprises a land-based circular pool body, a bottom discharge pipe and an air pipe.

[0050] 2、The utility model discloses a sewage system, which comprises a land-based circular pool body, a bottom discharge pipe and an air pipe.

[0051] 2、The utility model discloses a sewage system, which comprises a land-based circular pool body, a bottom discharge pipe and an air pipe.

[0052] 2、The utility model discloses a sewage system, which comprises a land-based circular pool body, a bottom discharge pipe and an air pipe.

[0053] 2、The utility model discloses a sewage system, which comprises a land-based circular pool body, a bottom discharge pipe and an air pipe. BRIEF DESCRIPTION OF DRAWINGS

[0054] Fig. 1 is the whole of the automatic pollution discharge mechanism for land-based circular pool circulating water aquaculture of the present application

[0055] Structure diagram;

[0056] Fig. 2 is the A place of the automatic pollution discharge mechanism for land-based circular pool circulating water aquaculture of the present application

[0057] Structure enlarged view;

[0058] Fig. 3 is the B place of the automatic pollution discharge mechanism for land-based circular pool circulating water aquaculture of the present application

[0059] Structure enlarged view.

[0060] In the figure: 1, land-based circular pool body; 2, fish toilet; 3, bottom discharge pipe; 4, air pipe; 5, pollution discharge

[0061] Pool; 6, external drain pipe; 7, water inlet pipe; 8, air regulating valve; 9, adjustable throttle valve. DETAILED DESCRIPTION

[0062] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand

[0063] , the following will be further described in combination with specific embodiments.

[0064] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate the positional or positional relationship based on the position or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not indicative or implied that the indicated device or element must have a specific orientation, structure and operation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicative or implied relative importance.

[0065]

[0066]

[0067]

[0068]

[0069] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection", which can be understood as a direct connection or indirect connection through other device (s) or element (s).

[0070] ​​​​​

[0071] It can be fixedly connected, detachably connected or integrally connected; it can be mechanically connected,

[0072] It can also be electrically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be

[0073] Communication between two elements. For those skilled in the art, it can be understood in specific circumstances

[0074] The specific meaning of the above terms in the utility model.

[0075] Please refer to Figures 1-3, the utility model provides a technical scheme:

[0076] An automatic pollution discharge mechanism for land-based circular pool circulating water aquaculture, comprising a land-based circular pool body 1

[0077] And a pollution discharge assembly adapted to the land-based circular pool body 1, the pollution discharge assembly comprising a fish toilet 2, a bottom discharge pipe 3, an air pipe 4 and a pollution discharge pool 5 arranged at the bottom of the land-based circular pool body 1

[0078] The diameter of the land-based circular pool body 1 is 8 meters, the depth is 2.2 meters, the air pipe 4 is inserted into the land-based circular pool body 1 at a depth of 40 centimeters away from the pollution discharge pool 5

[0079] The diameter of the land-based circular pool body 1 is 8 meters, the depth is 2.2 meters, the air pipe 4 is inserted into the land-based circular pool body 1 at a depth of 40 centimeters away from the pollution discharge pool 5

[0080] The diameter of the land-based circular pool body 1 is 8 meters, the depth is 2.2 meters, the air pipe 4 is inserted into the land-based circular pool body 1 at a depth of 40 centimeters away from the pollution discharge pool 5

[0081] In this embodiment, the bottom discharge pipe 3 is connected to the bottom of the pollution discharge pool 5 at an inclination angle of 15°-30°, on the one hand

[0082] Utilize the gravity effect, so that the sewage can flow faster and more effectively from the land-based circular pool body 1 to the pollution discharge pool 5, compared with the horizontal pipeline or the pipeline that is too steep, the angle of 15°-30° can ensure sufficient flow rate, and can avoid the impact and wear problems caused by too fast flow rate, on the other hand, it is helpful to reduce

[0083] The deposition and accumulation of solid impurities in the pipeline, thereby reducing the risk of blockage; one end of the bottom discharge pipe (3) is fixedly connected with the fish toilet (2) through a sealing connector, and the connection between the bottom discharge pipe 3 and the fish toilet 2

[0084] Uses a rubber sealing ring and a stainless steel fastening bolt to seal, which can reduce the risk of blockage; the other end of the bottom discharge pipe 3 is connected with the pollution discharge pool 5 through a sealing connector, and the connection between the bottom discharge pipe 3 and the pollution discharge pool 5

[0085] Uses a rubber sealing ring and a stainless steel fastening bolt to seal, which can reduce the risk of blockage; the other end of the bottom discharge pipe 3 is connected with the pollution discharge pool 5 through a sealing connector, and the connection between the bottom discharge pipe 3 and the pollution discharge pool 5

[0086] Uses a rubber sealing ring and a stainless steel fastening bolt to seal, which can reduce the risk of blockage; the other end of the bottom discharge pipe 3 is connected with the pollution discharge pool 5 through a sealing connector, and the connection between the bottom discharge pipe 3 and the pollution discharge pool 5

[0087] Various sedimentary impurities, such as feed, are stably transported to subsequent processing stages; the bottom discharge pipe 3 is equipped with a control device.

[0088] The adjustable throttle valve 9, which controls the flow rate and pressure of the drainage system, is used to finely regulate the water flow pressure and flow during the drainage process.

[0089] Speed ​​ensures a stable and balanced sewage discharge process; the vent pipe 4 is equipped with a throttling device to control the start and stop of the siphon.

[0090] Valve 8 precisely controls the entry and exit of air, thereby finely adjusting automatic drainage or shutting off drainage, while simultaneously using...

[0091] By monitoring the water level and siphon status within the land-based circular pool 1 in real time, the start and stop of the siphon can be manually controlled, ensuring the stability and balance of the entire sewage discharge process and providing a solid guarantee for efficient drainage.

[0092] This utility model relates to an automatic sewage discharge mechanism for land-based circular pond recirculating aquaculture.

[0093] During the process, as the water level inside the land-based circular pool 1 gradually rises and reaches or exceeds the preset 1.8-meter threshold...

[0094] When the water level reaches the dynamic water level line, gravity causes the siphon to start. At this time, water begins to flow along the bottom drain pipe 3, filling the pool.

[0095] The accumulated feces and residual feed, as well as other impurities, are steadily transported to the bottom of sewage tank 5, with an insertion depth of 40 cm.

[0096] The vent pipe 4 plays a crucial role in the rising water level. When the water level reaches the port of vent pipe 4,

[0097] By controlling the air intake and exhaust through throttle valve 8, a vacuum environment is created inside the pipe, and the water will force the air out of the pipe.

[0098] This creates a negative pressure of approximately 0.08-0.1 MPa, triggering a siphon effect. At this point, water flows along the bottom drain pipe 3.

[0099] Continuous discharge ensures an efficient sewage discharge process. An adjustable throttle valve 9 is installed on the bottom discharge pipe 3 for precise control.

[0100] By finely adjusting the water pressure and flow rate during the drainage process, the stability and balance of the sewage discharge process are ensured.

[0101] Meanwhile, the throttle valve 8 on the vent pipe 4 can be manually or automatically adjusted as needed to maintain the siphon effect.

[0102] The vacuum state required for suction not only improves sewage discharge efficiency but also avoids damage caused by excessive drainage.

[0103] Water wastage occurs when the water level in the land-based circular pool 1 fluctuates due to drainage, aquaculture activities, or other factors.

[0104] When the external environmental conditions drop below the level of port 4 of the ventilator, air will rush into the ventilator, breaking the vacuum.

[0105] The environment allows the siphon to stop, effectively preventing unnecessary continuous drainage and saving water.

[0106] Resources were secured, and the normal operation of the system was ensured. If the water level rises again and crosses the inlet of vent pipe 4,

[0107] The siphon system will automatically restart and continue its efficient sewage discharge operation. The sewage treated through the above steps will then be discharged.

[0108] The water is discharged through the external drain pipe 6, while the PVC110 inlet pipe 7 is responsible for replenishing the pool with fresh water to maintain its balance.

[0109] Water quality is clean.

[0110] It should be noted that this utility model can be flexibly adjusted according to the needs of different scales of aquaculture.

[0111] The dimensions of the circular pool body 1 and the specifications of the drainage pipes are designed to meet diverse needs. For example, according to...

[0112] Different types of adjustable throttle valves can be selected to meet different water quality requirements and drainage speeds, enabling customized adjustments.

[0113] This flexibility not only enhances the system's usability but also better adapts to various application scenarios, providing a better foundation for nurturing...

[0114] Provide farmers with more economical and efficient solutions.

[0115] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments.

[0116] The embodiments and descriptions provided are merely illustrative of the principles of this invention and should not be construed without departing from the scope of this invention.

[0117] Within the spirit and scope, this utility model may have various changes and modifications, and these changes and modifications...

[0118] All of these fall within the scope of this utility model as claimed. The scope of protection of this utility model is defined by the appended claims.

[0119] The definition of the claim and its equivalent.

Claims

1. An automatic sewage discharge mechanism for land-based circular pond recirculating aquaculture, characterized in that: It includes a land-based circular pool body (1) and a sewage discharge assembly adapted to the land-based circular pool body (1). The sewage discharge assembly includes a fish toilet (2), a bottom drain pipe (3), a vent pipe (4), and a sewage discharge pool (5) located at the bottom of the land-based circular pool body (1). The sewage tank (5) is provided with an external drainage pipe (6) that communicates with the inside of the sewage tank (5). The land-based circular pool body (1) is provided with an inlet pipe (7) that communicates with the inside of the land-based circular pool body (1). One end of the bottom drain pipe (3) is fixedly connected to the fish toilet (2) through a sealing connector, and the other end of the bottom drain pipe (3) is inserted into the sewage tank (5). One end of the vent pipe (4) is inserted into the land-based circular pool body (1), and the other end of the vent pipe (4) is fixedly connected to the bottom drain pipe (3).

2. The automatic sewage discharge mechanism for land-based circular pond recirculating aquaculture as described in claim 1, characterized in that: The bottom drain pipe (3) is connected to the bottom of the sewage tank (5) at an inclination angle of 15°-30°.

3. The automatic sewage discharge mechanism for land-based circular pond recirculating aquaculture as described in claim 1, characterized in that: The connection between the bottom drain pipe (3) and the fish toilet (2) is sealed with a rubber sealing ring and stainless steel fastening bolts.

4. An automatic sewage discharge mechanism for land-based circular pond recirculating aquaculture as described in claim 1, characterized in that: An adjustable throttle valve (9) is installed on the bottom drain pipe (3) to control the drainage flow rate and pressure.

5. An automatic sewage discharge mechanism for land-based circular pond recirculating aquaculture as described in claim 1, characterized in that: The vent pipe (4) is equipped with a throttle valve (8) for controlling the start and stop of the siphon.

6. An automatic sewage discharge mechanism for land-based circular pond recirculating aquaculture as described in claim 1, characterized in that: The diameter of the land-based circular pool body (1) is 8 meters and the depth is 2.2 meters. The end of the ventilation pipe (4) away from the sewage pool (5) is inserted into the land-based circular pool body (1) to a depth of 40 centimeters.