Rice field ecological cycle aquaculture system and control method thereof

Abstract

According to the paddy field ecological cycle aquaculture system and the control method thereof, suspended solids can be removed through a sedimentation tank, ammonia nitrogen and organic matter can be degraded through combination of composite filler and an aeration assembly in a biological filter, nitrogen and phosphorus can be further removed through absorption of emergent aquatic plants in ditches and filter feeding of filter feeding shellfish, and the ecological cycle aquaculture system can be used for ecological cycle aquaculture of paddy fields. Three-stage treatment of water quality is realized; the rice field culture area, the ditch, the aquaculture pond, the settling pond, the biological filter, the return pipe and the gate are arranged in a matched mode, so that closed-loop circulation of water can be achieved, and water discharge is effectively reduced. In the breeding process, nitrogen and phosphorus in drained water in the rice field breeding area are absorbed by emergent aquatic plants in the ditch and converted into biomass, the biomass is harvested and can be used for supplementing feed in the aquaculture pond, bottom mud regularly dredged in the ditch is conveyed to the rice field breeding area and can serve as organic fertilizer, and breeding waste is effectively utilized; the design of gravity flow can effectively reduce energy consumption of the water pump, and energy is saved; the PLC control system is used for regulation and control, and the management efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture, and particularly to a paddy field ecological circulation aquaculture system and a control method thereof. Background Art

[0002] With the increasing attention of the country to the ecological environment and the deepening adjustment of the industrial structure, the importance of aquaculture has become increasingly prominent. In recent years, industrial aquaculture in China has developed rapidly. During aquaculture, a lot of waste is generated during the growth of aquatic products, which enters the environment with the water body, causing environmental pollution, making the water body lose its regulatory function, unable to achieve sustainable development, leading to ecological environment problems. At the same time, water pollution in turn restricts the development of aquaculture. During the aquaculture process, a large amount of aquaculture wastewater is generated.

[0003] Based on the above situation, paddy field ecological circulation aquaculture has emerged as a sustainable agricultural model. This aquaculture method combines the advantages of rice cultivation and aquaculture, achieving efficient utilization of resources and protection of the ecological environment. However, the current design research of the aquaculture circulating water system is not mature. There are problems in paddy field aquaculture such as insufficient water body exchange, low dissolved oxygen content resulting in limited aquaculture density; ineffective resource utilization of aquaculture waste, which is prone to cause non-point source pollution; lack of intelligent control means, and low management efficiency relying on manual experience. Summary of the Invention

[0004] The purpose of this application is to provide a paddy field ecological circulation aquaculture system and a control method thereof to solve the problems existing in the existing aquaculture system, such as insufficient water body exchange, low dissolved oxygen content resulting in limited aquaculture density; ineffective resource utilization of aquaculture waste, which is prone to cause non-point source pollution; lack of intelligent control means, and low management efficiency relying on manual experience.

[0005] To solve the above technical problems, this application provides a paddy field ecological circulation aquaculture system, including:

[0006] A paddy field aquaculture area, a ditch lower than the paddy field aquaculture area is arranged around the periphery of the paddy field aquaculture area, an aquaculture pond lower than the ditch is arranged around the periphery of the ditch, a liquid level sensor is further arranged on one side of the aquaculture pond, a gate is arranged between the ditch and the paddy field aquaculture area, a plurality of drain pipes located in the aquaculture pond are arranged on the side of the ditch, and an electromagnetic control valve is arranged on the drain pipe;

[0007] One side of the aquaculture pond is connected to a sedimentation pond lower than the aquaculture pond through a pipeline. An electric ball valve is arranged on the pipeline. One side of the sedimentation pond is provided with a biological filter tank lower than the sedimentation pond. One side of the biological filter tank is communicated with a water return pipe through a pump body, and the other end of the water return pipe is connected to the ditch. Overflow components are arranged on the side of the paddy field aquaculture area and on the side of the sedimentation pond close to the biological filter tank. Emergent plants are planted in the ditch and filter-feeding shellfish are put in. The biological filter tank is filled with composite fillers.

[0008] An aeration component is arranged at the bottom of the biological filter tank. A water quality monitor is arranged on the water return pipe. The electromagnetic control valve, the liquid level sensor, the electric ball valve, the aeration component and the water quality monitor are all electrically connected to the PLC control system.

[0009] As a preferred embodiment, in a paddy field ecological cycle aquaculture system, an exhaust valve is further arranged on the drain pipe.

[0010] As a preferred embodiment, in a paddy field ecological cycle aquaculture system, the composite filler includes a bamboo charcoal particle layer laid at a depth of 30-40 cm from the bottom layer of the biological filter tank to the bottom of the tank, a mixed layer of oyster shell powder and polyurethane carrier laid in the middle layer of the biological filter tank, and volcanic rock particles laid on the top layer of the biological filter tank.

[0011] It should be specifically explained in the solution that, in a paddy field ecological cycle aquaculture system, the aeration component includes a plurality of aeration pipes arranged between the bamboo charcoal particle layer and the mixed layer of oyster shell powder and polyurethane carrier in the biological filter tank. A plurality of nano aeration discs are arranged on each aeration pipe. The other end of the aeration pipe extends to the outside of the biological filter tank and is connected to a compressor, and the compressor is electrically connected to the PLC control system.

[0012] As a preferred embodiment, in a paddy field ecological cycle aquaculture system, the overflow component includes overflow plates on the side of the paddy field aquaculture area and on one side of the sedimentation pond. A plurality of overflow holes are arranged on the overflow plates.

[0013] It should be further explained in the solution that, in a paddy field ecological cycle aquaculture system, a buffer platform corresponding to each overflow hole is further arranged at the lower part of one side of the sedimentation pond.

[0014] As a preferred embodiment, in a paddy field ecological cycle aquaculture system, a light-shielding board is further arranged on the top of the biological filter tank.

[0015] As a preferred embodiment, in a paddy field ecological cycle aquaculture system, an electromagnetic flowmeter electrically connected to the PLC control system is further arranged on the water return pipe.

[0016] To solve the above technical problems, the present application also provides a control method corresponding to the paddy field ecological cycle aquaculture system, including:

[0017] The PLC control system controls the action of the aeration component according to the water quality information detected by the water quality monitor;

[0018] When the PLC control system determines that the liquid level detected by the liquid level sensor is greater than the set value, it controls the electric ball valve to open and the electromagnetic control valve to close;

[0019] When the PLC control system determines that the liquid level detected by the liquid level sensor is less than the set value, it controls the electric ball valve to close and the electromagnetic control valve to open.

[0020] Compared with the prior art, the paddy field ecological cycle aquaculture system and its control method provided by the present invention at least include the following beneficial effects:

[0021] Through the sedimentation tank, more than 80% of the suspended solids can be removed. Through the combination of the composite filler and the aeration component in the biological filter, ammonia nitrogen and organic matter can be degraded. Through the absorption of emergent plants in the ditch and the filtration of filter-feeding shellfish, nitrogen and phosphorus can be further removed, effectively reducing the nitrogen and phosphorus discharge. The combined use of the sedimentation tank, biological filter, and ditch can achieve three-stage treatment of water quality;

[0022] The coordinated setting of the paddy field aquaculture area, ditch, aquaculture pond, sedimentation tank, biological filter, return pipe, and gate can realize the closed-loop circulation of water body, effectively reducing the external drainage volume. In the actual aquaculture process, the nitrogen and phosphorus in the drainage of the paddy field aquaculture area are absorbed by the emergent plants in the ditch and converted into biomass, which can be harvested and used as a supplement for feed in the aquaculture pond. The sediment regularly dredged from the ditch is transported to the paddy field aquaculture area as organic fertilizer, achieving the effective utilization of aquaculture waste. In addition, the gravity flow design between the paddy field aquaculture area, ditch, aquaculture pond, sedimentation tank, and biological filter can effectively reduce the energy consumption of the water pump and save energy;

[0023] Using the PLC control system to regulate and control the aquaculture system can improve the management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of a paddy field ecological cycle aquaculture system provided by an embodiment of the present application;

[0026] Figure 2Schematic diagram of the internal structure of a biological filter provided by an embodiment of the present application;

[0027] In the figure: 1. Paddy field aquaculture area; 2. Ditch; 3. Aquaculture pond; 4. Liquid level sensor; 5. Gate; 6. Drain pipe; 7. Electromagnetic control valve; 8. Pipeline; 9. Sedimentation tank; 10. Electric ball valve; 11. Biological filter; 12. Pump body; 13. Return water pipe; 14. Water quality monitor; 15. Exhaust valve; 16. Bamboo charcoal particle layer; 17. Mixed layer of oyster shell powder and polyurethane carrier; 18. Volcanic rock particles; 19. Aeration pipe; 20. Nano aeration disc; 21. Overflow plate; 22. Overflow hole; 23. Buffer platform; 24. Light shielding plate; 25. Electromagnetic flowmeter. Specific embodiments

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0029] The core of the present application is to provide a paddy field ecological cycle aquaculture system and its control method, which solves the problems existing in the existing aquaculture systems, such as insufficient water body exchange, low dissolved oxygen content resulting in limited aquaculture density; ineffective resource utilization of aquaculture waste, which is prone to cause non-point source pollution; lack of intelligent control means, and low management efficiency relying on manual experience.

[0030] Figure 1 Schematic diagram of the structure of a paddy field ecological cycle aquaculture system provided by an embodiment of the present application, Figure 2 Schematic diagram of the internal structure of a biological filter provided by an embodiment of the present application, see Figures 1 to 2 as shown.

[0031] Embodiment 1

[0032] A paddy field ecological cycle aquaculture system includes a paddy field aquaculture area 1, where rice is planted. At the same time, benthic organisms such as loach can also be cultured in the paddy field aquaculture area 1. A ditch 2 lower than the paddy field aquaculture area 1 is arranged around the periphery of the paddy field aquaculture area 1. An aquaculture pond 3 lower than the ditch 2 is arranged around the periphery of the ditch 2. In actual design, the ditch 2 can be arranged in a serpentine shape and set 5 - 8 cm lower than the paddy field aquaculture area, and the aquaculture pond 3 is set 20 - 30 cm lower than the ditch 2. Through this setting, gravity can be used to achieve non-powered water conveyance. A liquid level sensor 4 is also arranged on one side of the aquaculture pond 3 to detect the liquid level in the aquaculture pond 3. The liquid level sensor 4 can be a non-contact liquid level sensor. For example, an ultrasonic liquid level sensor. A gate 5 is arranged between the ditch 2 and the paddy field aquaculture area 1. Opening the gate 5 can make the water in the ditch 2 flow into the paddy field aquaculture area 1. The opening degree of the gate 5 can be determined according to the actual situation. A plurality of drain pipes 6 located in the aquaculture pond 3 are arranged on the side of the ditch 2. An electromagnetic control valve 7 is arranged on the drain pipe 6. Through the drain pipe 6, the water in the ditch 2 can be discharged into the aquaculture pond 3. The ditch 2 can be used as a buffer water storage area.

[0033] One side of the aquaculture pond 3 is connected to a sedimentation pond 9 lower than the aquaculture pond 3 through a pipeline 8. An electric ball valve 10 is arranged on the pipeline 8. The switches of the electromagnetic control valve 7 and the electric ball valve 10 can both be determined according to the height of the liquid level in the aquaculture pond 3. A biological filter tank 11 lower than the sedimentation pond 9 is arranged on one side of the sedimentation pond 9. One side of the biological filter tank 11 is connected to a return water pipe 13 through a pump body 12. The other end of the return water pipe 13 is connected to the ditch 2; Overflow components are arranged on the side of the paddy field aquaculture area 1 and on the side of the sedimentation pond 9 close to the biological filter tank 11. Through the arranged overflow components, the supernatant in the paddy field aquaculture area 1 and the sedimentation pond 9 can overflow to the next link; Emergent plants are planted in the ditch 2 and filter-feeding shellfish (Hyriopsis cumingii) are put in. The emergent plants include reeds, cattails, etc. Through the absorption of the emergent plants and the filtration of the shellfish, more than 70% of the phosphorus content in the water can be removed. The biological filter tank 11 is filled with composite fillers; More than 80% of the suspended solids can be removed through the sedimentation pond 9, and ammonia nitrogen and organic matter can be degraded through the biological filter tank 11;

[0034] An aeration component is provided at the bottom of the biological filter 11. By releasing bubbles through the aeration component, the dissolved oxygen concentration in the water body is maintained within the optimal range suitable for the growth of fish and shrimp, avoiding biological death caused by hypoxic stress. Activation of aerobic bacteria: Provide oxygen for nitrifying bacteria (such as Nitrosomonas and Nitrobacter) in the biological filter 11 to inhibit anaerobic bacteria. By increasing the water body fluidity, the formation of the bottom anaerobic zone is reduced, and the generation of harmful gases such as hydrogen sulfide (H2S) and methane (CH4) is decreased, thereby promoting microbial metabolism. Eliminate the vertical stratification phenomenon of water temperature and dissolved oxygen through air-lift action, and enhance the mixing uniformity of the water body. Adsorb fine suspended particles during the rising process of the bubbles. Increasing the dissolved oxygen in the water body can strengthen the oxidation ability of the rice roots in the paddy field aquaculture area 1, improve their absorption efficiency of ammonia nitrogen, and increase the root activity by 20%-30%. The high dissolved oxygen environment accelerates the metabolic rate of fish and shrimp, and the aquaculture density per unit area can be increased to 1.5-2 times that of the traditional mode. A water quality monitor 14 is provided on the return pipe 13. The electromagnetic control valve 7, the liquid level sensor 4, the electric ball valve 10, the aeration component, and the water quality monitor 14 are all electrically connected to the PLC control system. Through the water quality monitor 14, the contents of ammonia nitrogen and nitrite in the water can be detected, and the data is transmitted to the PLC control system in real time. When the PLC control system determines that the ammonia nitrogen concentration > 0.8 mg / L, the PLC control system controls the aeration component to start.

[0035] Example 2

[0036] Based on Example 1, in a paddy field ecological cycle aquaculture system, an exhaust valve 15 is further provided on the drain pipe 6. By providing the exhaust valve 15, the water flow in the drain pipe 6 can be prevented from being affected by air resistance.

[0037] Based on Example 1, in a paddy field ecological cycle aquaculture system, the composite filler includes a bamboo charcoal particle layer 16 laid at the bottom layer of the biological filter 11, 30-40 cm away from the bottom of the pool, an oyster shell powder and polyurethane carrier mixed layer 17 laid in the middle layer of the biological filter 11, and volcanic rock particles 18 laid on the top layer of the biological filter 11. The oyster shell powder and polyurethane carrier mixed layer 17 serves as the main attachment area for nitrifying bacteria, and the volcanic rock particles 18 can prevent the filler from floating due to water flow disturbance.

[0038] In this embodiment, a paddy field ecological cycle aquaculture system, the aeration component includes a plurality of aeration pipes 19 arranged between the bamboo charcoal particle layer 16 and the oyster shell powder and polyurethane carrier mixed layer 17 in the biological filter 11. A plurality of nano-aeration discs 20 are arranged on each aeration pipe 19. The other end of the aeration pipe 19 extends outside the biological filter 11 and is connected to a compressor, and the compressor is electrically connected to the PLC control system. The microbubbles generated by aeration penetrate the composite filler from bottom to top, prolonging the gas-liquid contact time and increasing the oxygen utilization rate to 85%-90%. The aeration airflow promotes the formation of turbulence in the pores of the composite filler, enhancing the mass transfer efficiency between microorganisms (nitrifying bacteria, denitrifying bacteria) and pollutants, and increasing the ammonia nitrogen degradation rate to 0.35-0.45 g / (m 3 ·h); the aerobic-anaerobic microenvironment formed on the surface of the composite filler promotes the simultaneous nitrification-denitrification reaction, and the total nitrogen removal rate is increased to more than 85%. During actual use, intermittent aeration can be controlled through the PLC control system. Using this aeration mode (aeration for 30 min / stop for 15 min) generates a pulsed airflow to scour the pores of the composite filler, reducing the risk of blockage caused by excessive thickening of the biofilm, and can extend the service life of the composite filler.

[0039] Table 1 Improvement of water purification efficiency

[0040] Pollutant index Without aeration components Aeration + composite packing Removal rate improvement <![CDATA[Ammonia nitrogen (NH3-N)]]> 65％ 93％ +28％ COD 70％ 88％ +18％ Suspended solids (SS) 60％ 82％ +22％

[0041] On the basis of Embodiment 1, a paddy field ecological cycle aquaculture system. In order to achieve the overflow of water, preferably, the overflow component includes an overflow plate 21 located on the side of the paddy field aquaculture area 1 and one side of the sedimentation tank 9, and a plurality of overflow holes 22 are arranged on the overflow plate 21.

[0042] In this embodiment, a paddy field ecological cycle aquaculture system. In order to buffer the water overflowing from the sedimentation tank 9, preferably, a buffer platform 23 corresponding to each overflow hole 22 is further arranged at the lower part of one side of the sedimentation tank 9.

[0043] On the basis of Embodiment 1, in a paddy field ecological cycle aquaculture system, a light-shielding plate 24 is further provided on the top of the biological filter 11. Adding the light-shielding plate 24, firstly, it can inhibit the reproduction of algae and prevent ecological interference. Specifically, the light-shielding plate 24 can be made of light-impermeable materials such as PVC plates or aluminum-plastic plates, which can block more than 90% of natural light and create conditions to disrupt the photosynthesis of algae. Excessive reproduction of algae will cause fluctuations in the pH value of the water body and oxygen consumption at night. After shading, the pH fluctuation can be reduced and the oxygen consumption at night can be decreased. Secondly, it can protect the microbial activity and improve the purification efficiency. Specifically, nitrifying bacteria (such as Nitrosomonas and Nitrobacter) in the biological filter 11 are sensitive to ultraviolet light. The setting of the light-shielding plate 24 can reduce 70%-80% of UV radiation, keeping the activity of the bacterial community at ≥85% (when there is no shading, the activity decays to less than 60%); it can avoid the drastic temperature fluctuation on the surface of the composite filler caused by light (after shading, the daily temperature difference ≤2°C, and when there is no shading, it can reach 8-10°C), ensuring the stability of the biofilm structure and increasing the ammonia nitrogen removal rate by 15%-20%. Thirdly, it can prevent photolysis reactions and maintain water quality stability. Specifically, some microbial metabolites (such as vitamins and extracellular polymers) and the added EM bacterial agent are easily decomposed under light. Shading can reduce the loss of 30%-40% of the active ingredients. Fourthly, it can reduce water evaporation and optimize water resource utilization. Specifically, the light-shielding plate 24 can reduce the evaporation amount on the surface of the biological filter 11 by 50%-70% (measured data: the evaporation amount in summer drops from 8 mm / day to 2.5 mm / day), significantly reducing the water make-up amount; after shading, the water temperature fluctuation decreases, and the water temperature in the high-temperature period of summer drops by 3-5°C, avoiding the outbreak of thermophilic harmful bacteria (such as Aeromonas).

[0044] Table 2 Technical effects achieved by the light-shielding plate

[0045] Index Without light shield Covered with light shield Improvement effect Algae density (cells / mL) <![CDATA[1.2×10 6 > <![CDATA[3.8×10 4 > -96.8％ Ammonia nitrogen removal rate (%) 68％ 85％ +17％ Daily water temperature fluctuation (°C) 8.5 1.7 -80％ <![CDATA[Annual water replenishment volume (m 3 / mu)]]> 150 45 -70％ Biofilm replacement cycle (years) 1.5 3.0 +100％

[0046] On the basis of Embodiment 1, in a paddy field ecological cycle aquaculture system, for the convenience of measuring the daily circulating water volume, preferably, an electromagnetic flowmeter 25 electrically connected to the PLC control system is further provided on the return pipe 13.

[0047] An ecological circular aquaculture system for paddy fields provided by an embodiment of the present application can remove more than 80% of suspended solids through a sedimentation tank 9, degrade ammonia nitrogen and organic matter through the combination of composite fillers and aeration components in a biological filter tank 11, and further remove nitrogen and phosphorus through the absorption of emergent plants in a ditch 2 and the filtration of filter-feeding shellfish, effectively reducing the external discharge of nitrogen and phosphorus. The combined use of the sedimentation tank 9, biological filter tank 11, and ditch 2 can achieve three-stage treatment of water quality; the coordinated setting of a paddy field aquaculture area 1, ditch 2, aquaculture pond 3, sedimentation tank 9, biological filter tank 11, return pipe, and gate 5 can achieve a closed-loop water circulation, effectively reducing the external discharge volume. During actual aquaculture, the nitrogen and phosphorus in the drained water of the paddy field aquaculture area 1 are absorbed by the emergent plants in the ditch 2 and, after being converted into biomass, are harvested and can be used as supplements for feed in the aquaculture pond 3. The bottom sludge regularly dredged from the ditch 2 is transported to the paddy field aquaculture area 1 and can be used as organic fertilizer, achieving the effective utilization of aquaculture waste. In addition, the gravity flow design among the paddy field aquaculture area 1, ditch 2, aquaculture pond 3, sedimentation tank 9, and biological filter tank 11 can effectively reduce the energy consumption of water pumps and save energy; using a PLC control system to regulate and control the aquaculture system can improve management efficiency.

[0048] The embodiments of the ecological circular aquaculture system for paddy fields are described in detail above. Based on the ecological circular aquaculture system for paddy fields described in the above embodiments, an embodiment of the present invention also provides a control method for an ecological circular aquaculture system for paddy fields corresponding to this system. Since the embodiments of the control method part correspond to the embodiments of the system part, the embodiments of the control method part are described with reference to the embodiments of the system part and will not be elaborated here.

[0049] A control method for an ecological circular aquaculture system for paddy fields includes:

[0050] The PLC control system controls the operation of the aeration component according to the water quality information detected by the water quality monitor;

[0051] When the PLC control system determines that the liquid level detected by the liquid level sensor is greater than the set value, it controls the electric ball valve to open and the electromagnetic control valve to close;

[0052] When the PLC control system determines that the liquid level detected by the liquid level sensor is less than the set value, it controls the electric ball valve to close and the electromagnetic control valve to open.

[0053] A control method for an ecological circular aquaculture system for paddy fields provided by an embodiment of the present application uses a PLC control system to regulate and control the aquaculture system, which can improve management efficiency.

[0054] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope of the present application is pointed out by the claims.

[0055] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The embodiments of the present application described above do not constitute a limitation on the protection scope of the present application.

Claims

1. A rice field ecological circulation aquaculture system, characterized in that: include: A rice field breeding area (1), wherein a ditch (2) lower than the rice field breeding area (1) is arranged around the outer periphery of the rice field breeding area (1), an aquaculture pond (3) lower than the ditch (2) is arranged around the outer periphery of the ditch (2), a liquid level sensor (4) is also arranged on one side of the aquaculture pond (3), a gate (5) is arranged between the ditch (2) and the rice field breeding area (1), a plurality of drainage pipes (6) located in the aquaculture pond (3) are arranged on the side of the ditch (2), and an electromagnetic control valve (7) is arranged on the drainage pipe (6); One side of the aquaculture pond (3) is connected to a sedimentation tank (9) lower than the aquaculture pond (3) through a pipeline (8), the pipeline (8) is provided with an electric ball valve (10), one side of the sedimentation tank (9) is provided with a biofilter (11) lower than the sedimentation tank (9), one side of the biofilter (11) is connected to a return pipe (13) through a pump body (12), and the other end of the return pipe (13) is connected to the ditch (2); overflow components are provided on the side of the rice field breeding area (1) and on the side of the sedimentation tank (9) close to the biofilter (11); emergent plants are planted in the ditch (2) and filter-feeding shellfish are placed, and the biofilter (11) is filled with composite fillers; An aeration assembly is arranged at the bottom of the biofilter (11), a water quality monitor (14) is arranged on the return pipe (13), and the electromagnetic control valve (7), the liquid level sensor (4), the electric ball valve (10), the aeration assembly and the water quality monitor (14) are all electrically connected to a PLC control system.

2. The paddy field ecological circulation aquaculture system according to claim 1, characterized in that: The drainage pipe (6) is also provided with an exhaust valve (15).

3. The paddy field ecological circulation aquaculture system according to claim 1, characterized in that: The composite filler comprises a bamboo charcoal particle layer (16) laid on the bottom layer of the biological filter (11) with a depth of 30-40 cm, a mixed layer (17) of oyster shell powder and polyurethane carrier laid on the middle layer of the biological filter (11), and volcanic rock particles (18) laid on the top layer of the biological filter (11).

4. The paddy field ecological circulation aquaculture system according to claim 3, characterized in that: The aeration assembly comprises a plurality of aeration tubes (19) arranged in the biofilter (11) between the bamboo charcoal particle layer (16) and the oyster shell powder and polyurethane carrier mixed layer (17), each of the aeration tubes (19) being provided with a plurality of nano aeration disks (20), the other end of the aeration tube (19) extending to the outside of the biofilter (11) and connected to a compressor, and the compressor is electrically connected to the PLC control system.

5. The paddy field ecological circulation aquaculture system according to claim 1, characterized in that: The overflow assembly comprises an overflow plate (21) located at the side of the rice field breeding area (1) and one side of the sedimentation tank (9), and a plurality of overflow holes (22) are arranged on the overflow plate (21).

6. The paddy field ecological circulation aquaculture system according to claim 5, characterized in that: A buffer platform (23) corresponding to each overflow hole (22) is also provided at the lower part of one side of the sedimentation tank (9).

7. The paddy field ecological circulation aquaculture system according to claim 1, characterized in that: A sunshade (24) is also provided on the top of the biofilter (11).

8. The paddy field ecological circulation aquaculture system according to claim 1, characterized in that: The water return pipe (13) is also provided with an electromagnetic flow meter (25) electrically connected to the PLC control system.

9. A rice field ecological cycle aquaculture system control method, characterized in that: include: The PLC control system controls the aeration component action according to the water quality information detected by the water quality monitor; When the PLC control system determines that the liquid level detected by the liquid level sensor is greater than the set value, the electric ball valve is controlled to open and the electromagnetic control valve is controlled to close; When the PLC control system determines that the liquid level detected by the liquid level sensor is less than a set value, the electric ball valve is controlled to close and the electromagnetic control valve is controlled to open.

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