An aquaculture system

Abstract

The utility model relates to an aquaculture system relates to aquaculture equipment technical field for providing a kind of to meet the practical demand of individual small-scale breeder's cultivation system.Aquaculture system includes biochemical pool, fish pond and microparticle machine, and the communication between biochemical pool and fish pond is through siphon pipe, to make biochemical pool to fish pond through siphon principle water supply, and fish pond is connected microparticle machine ice through water supply pipe, and the sewage in fish pond is transported to microparticle machine, and microparticle machine is handled after sewage and is transported to biochemical pool by water supply pipe.The oxygen supply assembly and two drain pipes are further included, the oxygen supply assembly is arranged on the bottom wall of biochemical pool, and covers the area of 65%~85% of the bottom wall of biochemical pool, to supply oxygen for the water in biochemical pool, and ammonia nitrogen and nitrite in biochemical pool are decomposed by artificial filler.One drain pipe is connected through the bottom wall of biochemical pool, to communicate with biochemical pool, and the drain pipe is spaced apart from the oxygen supply assembly, and the other drain pipe is arranged in microparticle machine.

Description

Technical Field

[0001] This application relates to the field of aquaculture equipment technology, and in particular to an aquaculture system. Background Technology

[0002] In the aquaculture industry, water quality management is always a core factor affecting the success or failure of aquaculture. During the aquaculture process, fish constantly engage in activities such as respiration, excretion, and feeding, continuously consuming dissolved oxygen in the water while harmful substances such as ammonia nitrogen and nitrite accumulate. If the aquaculture water is not purified in a timely and effective manner, the water quality will deteriorate rapidly, leading to slow fish growth, decreased immunity, and even large-scale mortality, causing serious economic losses to fish farmers.

[0003] Traditional aquaculture relies mainly on regular water changes to maintain water quality. This method not only consumes a lot of water resources, but also causes a large number of beneficial microbial communities in the water to be washed away by frequent water changes, making it difficult to establish a stable biological system, resulting in frequent fluctuations in water quality and high aquaculture risks.

[0004] Although some large-scale farms are equipped with water treatment equipment, these systems are often large, expensive, and energy-intensive, and require advanced installation and operation techniques, making them unsuitable for small-scale individual farmers with limited funds and technical expertise.

[0005] Existing small-scale aquaculture water treatment systems typically suffer from the following shortcomings: First, biochemical treatment and physical filtration functions are scattered across different devices, lacking organic integration and coordination, resulting in low water treatment efficiency. Second, the water supply relies heavily on pumps, which not only consume electricity but also interrupt the water supply if a pump malfunctions, indicating poor system fault tolerance. Third, the wastewater discharge function is poorly designed, making it difficult to completely remove sediment from the bottom of the pond, which accumulates over time to form anaerobic zones, producing harmful gases and pathogens and deteriorating water quality. Fourth, the installation and maintenance of the system are overly complex, requiring professional technicians to operate, increasing the operating costs and learning curve for aquaculture farmers. Summary of the Invention

[0006] This application provides an aquaculture system designed to meet the practical needs of individual small-scale farmers.

[0007] This application provides an aquaculture system, including a biological treatment tank, a fish pond, and a microparticle generator. The biological treatment tank and the fish pond are connected by a siphon pipe, so that the biological treatment tank supplies water to the fish pond through the siphon principle. The fish pond is connected to the microparticle generator through a water supply pipe, so that the wastewater in the fish pond is transported to the microparticle generator. After the microparticle generator treats the wastewater, it transports the water to the biological treatment tank through the water supply pipe.

[0008] The aquaculture system also includes an oxygen supply component and two sewage pipes. The oxygen supply component is installed on the bottom wall of the biological tank and covers 65% to 85% of the bottom wall area to supply oxygen to the water in the biological tank. Artificial filler is used to decompose ammonia nitrogen and nitrite in the biological tank.

[0009] One sewage pipe has its opening through the bottom wall of the biological treatment tank to connect the tank. This sewage pipe is distributed at intervals relative to the oxygen supply components. The opening of another sewage pipe is located inside the microparticle generator to discharge the dirt inside the microparticle generator. The dirt outlets of both sewage pipes are located in the area used for sewage discharge.

[0010] The water level in the biological treatment tank is higher than that in the fish pond. The water height in the biological treatment tank is 80% to 95% of the total height of the biological treatment tank. The water in the biological treatment tank is divided into an oxidation section, a water supply section, and an oxygen supply and sewage discharge section from top to bottom along the direction of gravity. The heights of the oxidation section, water supply section, and oxygen supply and sewage discharge section are the same or close. The siphon pipe opening is located at the water supply section, and the oxygen supply component and sewage discharge component are located at the oxygen supply and sewage discharge section, so that the oxygen supply, oxidation, water supply, and sewage discharge of the biological treatment tank are independent and work together.

[0011] This application connects the biochemical tank, the fish pond, and the microparticle generator in series to form a closed-loop water treatment circuit, realizing the circulation, purification, and reuse of aquaculture water. It eliminates the need for frequent water changes and significantly reduces the water costs and daily operation and maintenance expenses for small-scale farmers.

[0012] The biological treatment tank and the fish pond are connected by a siphon pipe and water is supplied by the siphon principle. There is no need to equip an additional water pump to complete the automatic water replenishment from the biological treatment tank to the fish pond. This reduces power consumption and equipment purchase and maintenance costs, making the whole system more suitable for the economic affordability of individual small-scale aquaculture scenarios.

[0013] The oxygen supply components cover 65% to 85% of the bottom wall of the biological tank and are used in conjunction with artificial fillers, which allows beneficial microorganisms such as nitrifying bacteria in the biological tank to attach and multiply fully, effectively decomposing ammonia nitrogen and nitrite in the water, thereby maintaining water quality stability, improving fish survival rate, and reducing the aquaculture risks caused by sudden changes in water quality.

[0014] Two drain pipes are installed at the bottom of the biochemical tank and inside the microparticle generator, respectively, which can promptly discharge the dirt deposited at the bottom of the tank and the residual impurities after microparticle processing out of the system, preventing harmful substances from accumulating in the system and reducing the daily cleaning burden on farmers.

[0015] The water body in the biological treatment tank is divided into three functional areas from top to bottom according to gravity: oxidation, water supply, and oxygen supply and sewage discharge. The siphon pipe is located in the water supply section, while the oxygen supply components and sewage discharge pipe are located in the oxygen supply and sewage discharge section. This allows the four functions of oxygen supply, oxidation, water supply, and sewage discharge in the biological treatment tank to operate independently yet collaboratively in space.

[0016] The partitioned design ensures that each functional area performs its own function without interfering with others. Even if a problem occurs in one functional area, it will not directly affect the normal operation of other areas, thereby improving the fault tolerance of the entire system.

[0017] Meanwhile, the similar or identical heights of the various functional areas ensure the uniformity and stability of the water flow distribution within the biological treatment tank, which is conducive to forming a regular water circulation rhythm and provides a reliable hardware foundation for establishing a standardized and orderly aquaculture management model for individual small-scale farmers.

[0018] In some embodiments of this application, the artificial packing material is MBBR suspended packing material, which floats or is suspended in the oxidation portion of the biological treatment tank water.

[0019] MBBR suspended media, as a mature water treatment material, has a large specific surface area and high biofilm adhesion, which can provide sufficient microbial biofilm area within a limited biochemical tank volume. For small-scale farmers, it can achieve good water purification effect without building a large-volume biochemical tank, effectively saving equipment investment and space occupation costs.

[0020] The packing material relies on the natural suspension movement of water flow, requiring no additional power drive device. It has low operating energy consumption and is easy to maintain, further reducing the operating cost of the system. The positioning method of the MBBR packing material, which floats or suspends in the oxidation section, places it precisely in the area of ​​high oxygen content in the water, which is conducive to the growth and metabolism of aerobic nitrifying bacteria, improves the removal efficiency of ammonia nitrogen and nitrite, and ensures the long-term stability of aquaculture water quality.

[0021] In some embodiments of this application, the two openings of the siphon extend into the biological treatment tank and the fish farming tank, respectively, and the siphon overlaps the top edge of the biological treatment tank and the fish farming tank.

[0022] The installation and disassembly of the siphon pipe are extremely simple. Farmers do not need to perform complicated construction operations such as drilling or sealing the pond. They only need to lay the pipe over the edge of the pond to complete the connection. This greatly reduces the installation cost and technical threshold of the system, making it very suitable for small individual farmers who do not have professional construction conditions to assemble and use themselves. The way the siphon pipe is laid over the edge of the pond top ensures that the highest point of the pipe is always higher than the water surface in the pond, ensuring that the siphon effect can be stably established and maintained, and will not be interrupted or fail due to improper pipe position.

[0023] In some embodiments of this application, the siphon pipe is located inside the fish pond and its opening is suspended above the water in the fish pond.

[0024] Water flowing from the biological treatment tank into the fish pond via a siphon pipe enters the pond naturally, allowing for full contact with air during the fall. This natural aeration and oxygenation increases the dissolved oxygen content in the pond, promoting healthy fish growth and reducing losses caused by oxygen deficiency. Furthermore, the pipe's suspension above the water surface helps farmers visually observe the water flow and promptly detect any siphon abnormalities.

[0025] In some embodiments of this application, the aquaculture system further includes an air baffle plate, which is disposed in the biological tank and fixedly disposed relative to the biological tank. The air baffle plate is located below the inlet of the siphon pipe in the biological tank, and the water inlet area of ​​the siphon pipe is completely projected onto the air baffle plate along the direction of gravity.

[0026] When the oxygen supply components in the biological tank are working, the generated bubbles move upward. The presence of the baffle plate can effectively block the bubbles from entering the water inlet area of ​​the siphon pipe, preventing the bubbles from being sucked into the siphon pipe and causing air blockage in the siphon pipe, thus avoiding the most common failure problem in actual use, which is siphon interruption.

[0027] This design improves the anti-interference capability and fault tolerance of the siphon system. Even when the oxygen supply component is operating at high power, the siphon pipe can still supply water stably, ensuring that the oxygen supply function and the water supply function do not interfere with each other, thus guaranteeing the continuous and stable operation of the entire aquaculture system. For individual small-scale farmers, this structure provides passive protection for the siphon pipe at extremely low cost, achieving the effect of preventing bubble interference without the need for additional power or control devices, making it economical and practical.

[0028] In some embodiments of this application, the distance between the baffle plate and the siphon tube is less than or equal to the radius of the siphon tube. This makes the baffle plate more precise and sufficient in shielding the water inlet area of ​​the siphon tube, further compressing the space for air bubbles to enter the inlet from the edge of the baffle plate, minimizing the possibility of air bubbles being sucked into the siphon tube, and further improving the reliability of airlock prevention.

[0029] In some embodiments of this application, the oxygen supply assembly includes an oxygenation pump, an annular air replenishment pipe, a connecting pipe, and an air supply pipe; at least two air replenishment pipes are provided, each with a different diameter and independent of the others, and at least two air replenishment pipes are coaxially arranged; at least three connecting pipes are provided between two adjacent air replenishment pipes, the connecting pipes connect the two adjacent air replenishment pipes, all the connecting pipes are independent of each other, the air supply pipe connects to the outermost air replenishment pipe and passes through the biological tank body and extends to the outside of the biological tank body, and the outer wall of the air supply pipe is sealed to the biological tank body.

[0030] The air supply pipe adopts a structure in which at least two annular pipes of different diameters are coaxially arranged, which can form a uniform annular oxygen supply area on the bottom wall of the biological tank, making the oxygen distribution more uniform and avoiding dead zones with local hypoxia or uneven oxygen supply. This is conducive to the comprehensive biofilm formation and efficient metabolism of nitrifying bacteria on the surface of the packing material, thereby improving the overall water purification effect.

[0031] Adjacent gas supply pipes are connected by at least three connecting pipes to form a network-type gas supply structure. Even if one connecting pipe is blocked or leaks, the remaining connecting pipes can still maintain the gas delivery function, which improves the redundancy and fault tolerance of the oxygen supply system and reduces the risk of the entire oxygen supply system being paralyzed due to local failure.

[0032] The air outlet is located on the top side of the air supply pipe with a diameter of 2mm to 10mm, which ensures that the bubbles can be released evenly from bottom to top. The bubbles are fine, have a long rising path, and a large contact area with the water, resulting in high oxygen transfer efficiency. This can reduce the operating power requirement of the aerator pump, thereby saving electricity costs.

[0033] The oxygenation pump is located outside the biological treatment tank, and the air outlet of the oxygenation pump is connected to the air supply pipe. The part of the air supply pipe facing the top of the biological treatment tank is provided with multiple air outlets, which are distributed circumferentially around the air supply pipe. The diameter of the air outlets is 2mm~10mm.

[0034] In some embodiments of this application, the aquaculture system also includes a sewage pump located outside the biological treatment tank, which provides power to the sewage pipe above the biological treatment tank.

[0035] The waste deposited at the bottom of the biological treatment tank can be forcibly discharged under the action of external power, without relying on the gravity of the water body or manual methods for sewage discharge, which improves the efficiency and thoroughness of sewage discharge and effectively prevents harmful sediments from accumulating at the bottom of the tank for a long time and deteriorating the water quality. For individual small-scale farmers, the sewage pump is easy to operate and can be started and stopped flexibly. Farmers can arrange the sewage discharge time and frequency regularly according to the water quality monitoring results and the breeding cycle, which helps to establish a standardized daily management process.

[0036] In some embodiments of this application, the biochemical chamber is in the shape of a cylindrical barrel and is composed of galvanized sheet and canvas.

[0037] The cylindrical structure distributes stress evenly, and the interior of the pool is less prone to dead zones, which is conducive to the uniform distribution of dissolved oxygen and microorganisms in the water, ensuring the consistency of biochemical treatment effects. The use of galvanized steel plates as the pool frame and shell provides good structural strength and corrosion resistance, enabling it to adapt to the humid outdoor aquaculture environment, extending the service life of the equipment, reducing the frequency of replacement and maintenance, and thus reducing the long-term investment costs for individual small-scale farmers.

[0038] In some embodiments of this application, the sewage discharged through the drain pipe includes, but is not limited to, feces and uneaten feed sediment. Feces and uneaten feed are the two major sources of organic pollution in aquaculture. If they are not removed in time, they will consume a large amount of dissolved oxygen in the water and release harmful substances such as ammonia nitrogen, seriously affecting the growth and survival of fish. Attached Figure Description

[0039] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0040] Figure 1 This is a schematic diagram of an aquaculture system provided in an embodiment of this application.

[0041] Figure 2 This is a schematic diagram of the oxygen supply component in the biochemical tank provided in an embodiment of this application.

[0042] Figure 3 This is a schematic diagram showing the relationship between the baffle plate and the siphon pipe in the biochemical tank provided in an embodiment of this application.

[0043] Attached diagram labels: 1-Biological tank; 11-Oxidation section; 12-Water supply section; 13-Oxygen supply and sewage discharge section; 2-Fish pond; 3-Microparticle generator; 4-Siphon pipe; 5-Oxygen supply assembly; 51-Aeration pump; 52-Air supply pipe; 53-Connecting pipe; 54-Air supply pipe; 55-Air outlet; 6-Sewage pipe; 7-Artificial filler; 8-Air baffle. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0048] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0049] In the aquaculture industry, water quality management is always a core factor affecting the success or failure of aquaculture. During the aquaculture process, fish constantly engage in activities such as respiration, excretion, and feeding, continuously consuming dissolved oxygen in the water while harmful substances such as ammonia nitrogen and nitrite accumulate. If the aquaculture water is not purified in a timely and effective manner, the water quality will deteriorate rapidly, leading to slow fish growth, decreased immunity, and even large-scale mortality, causing serious economic losses to fish farmers.

[0050] Traditional aquaculture relies primarily on regular water changes to maintain water quality. This method not only consumes significant amounts of water resources, but frequent water changes also wash away beneficial microbial communities, making it difficult to establish a stable biological system, leading to frequent water quality fluctuations and high aquaculture risks. Furthermore, while some large-scale farms are equipped with water treatment systems, these systems are often large, expensive, and energy-intensive, requiring advanced installation and operation techniques, making them unsuitable for small-scale individual farmers with limited funds and technical expertise.

[0051] Existing small-scale aquaculture water treatment systems typically suffer from the following shortcomings: First, biochemical treatment and physical filtration functions are scattered across different devices, lacking organic integration and coordination, resulting in low water treatment efficiency. Second, the water supply relies heavily on pumps, which not only consume electricity but also interrupt the water supply if a pump malfunctions, indicating poor system fault tolerance. Third, the wastewater discharge function is poorly designed, making it difficult to completely remove sediment from the bottom of the pond, which accumulates over time to form anaerobic zones, producing harmful gases and pathogens and deteriorating water quality. Fourth, the installation and maintenance of the system are overly complex, requiring professional technicians to operate, increasing the operating costs and learning curve for aquaculture farmers.

[0052] Therefore, please refer to Figure 1-3 This application provides an aquaculture system, including a biological treatment tank 1, a fish pond 2, and a microparticle generator 3. The biological treatment tank 1 and the fish pond 2 are connected by a siphon pipe 4 so that the biological treatment tank 1 supplies water to the fish pond 2 through the siphon principle. The fish pond 2 is connected to the microparticle generator 3 through a water supply pipe and the wastewater in the fish pond 2 is transported to the microparticle generator 3. The microparticle generator 3 treats the wastewater and then transports the water to the biological treatment tank 1 through the water supply pipe.

[0053] Please refer to Figure 1-3 The aquaculture system also includes an oxygen supply component 5 and two sewage pipes 6. The oxygen supply component 5 is installed on the bottom wall of the biological tank 1 and covers 65% to 85% of the bottom wall of the biological tank 1 to supply oxygen to the water in the biological tank 1. The artificial filler 7 decomposes ammonia nitrogen and nitrite in the biological tank 1. The opening of one sewage pipe 6 penetrates the bottom wall of the biological tank 1 to connect the biological tank 1. The sewage pipe 6 is distributed at intervals relative to the oxygen supply component 5. The opening of the other sewage pipe 6 is installed in the microparticle generator 3 to discharge the dirt in the microparticle generator 3. The dirt outlets of both sewage pipes 6 are located in the area used for sewage discharge.

[0054] Please refer to Figure 1-3 The water level in the biological treatment tank 1 is higher than that in the fish pond 2. The water height in the biological treatment tank 1 is 80% to 95% of the total height of the biological treatment tank 1. The water in the biological treatment tank 1 is divided into an oxidation section 11, a water supply section 12, and an oxygen supply and sewage discharge section 13 from top to bottom along the direction of gravity. The heights of the oxidation section 11, the water supply section 12, and the oxygen supply and sewage discharge section 13 are the same or close. The siphon pipe 4 is located at the water supply section 12, and the oxygen supply component 5 and the sewage discharge component are located at the oxygen supply and sewage discharge section 13, so that the oxygen supply, oxidation, water supply, and sewage discharge of the biological treatment tank 1 are independent and work together.

[0055] It can be explained that the proximity can have a limited range. For example, the difference between the maximum range and the minimum range is no more than 20%. That is, along the direction of gravity, the depth difference between any two of the oxidation part 11, the water supply part 12 and the oxygen supply and sewage discharge part 13 is no more than 20% of their own depth.

[0056] Please refer to Figure 1-3 For example, the system includes three core functional units: a biological treatment tank 1, a fish pond 2, and a microparticle generator 3, as well as a pipeline system connecting the three.

[0057] The biological purification tank 1 is the core of the entire system. It is equipped with artificial packing material 7 and oxygen supply components 5. It uses the nitrification and denitrification of microorganisms to decompose harmful substances such as ammonia nitrogen and nitrite in the water, so that the water quality meets the standards suitable for fish to live in.

[0058] Fish pond 2 is a place for fish farming. Fish grow, feed and excrete in fish pond 2. The wastewater containing feces, uneaten feed and other organic matter needs to be continuously purified.

[0059] For example, the microparticle filter 3 is a water treatment device that uses the principle of microfiltration to physically intercept and separate solid particles in water. The microparticle filter 3 can be in the form of a drum microfilter, a disc filter, or a rotary drum microfilter. Its core function is to separate solid impurities from the water body, thereby significantly reducing the turbidity and organic suspended solids content of the water body, thus reducing the biological treatment load of the subsequent biological treatment tank 1.

[0060] The three functional units are connected by a pipeline system to form a closed-loop water circulation circuit. Specifically, the fish pond 2 is connected to the microparticle generator 3 through a water supply pipe. One end of the water supply pipe extends into the fish pond 2 and is set in the lower part of the water body to collect the bottom water with a high concentration of pollutants. The other end is connected to the inlet of the microparticle generator 3.

[0061] Please refer to Figure 1-3 For example, wastewater in fish pond 2 is transported to microparticle filter 3 via a water supply pipe by a water pump or gravity for physical filtration. After the microparticle filter 3 intercepts and separates solid particles in the water, the effluent is transported to biological treatment tank 1 through a water supply pipe. One end of the water supply pipe is connected to the outlet of microparticle filter 3, and the other end is connected to the inlet of biological treatment tank 1.

[0062] After being treated by the microparticle generator 3, the water enters the biological treatment tank 1 and undergoes deep biological purification through the microbial biofilm attached to the artificial packing material 7 in the biological treatment tank 1, removing dissolved harmful substances such as ammonia nitrogen and nitrite from the water.

[0063] For example, after purification, the water is automatically transported from the biological treatment tank 1 to the fish pond 2 via the siphon pipe 4, completing a full water cycle. This forms a continuous water circulation path of fish pond 2—microparticle generator 3—biological treatment tank 1—fish pond 2. The aquaculture water circulates repeatedly in this loop, continuously receiving dual treatment of physical filtration and biological purification, and the water quality is always maintained within a range suitable for fish growth.

[0064] Please refer to Figure 1-3 The biological tank 1 is cylindrical in shape, which makes the inside of the tank free of sharp corners and dead corners. When the water flows in the tank, the flow lines are smooth and unobstructed, and there will be no stagnant areas in the corners, which is conducive to the uniform distribution of dissolved oxygen and microorganisms in the water.

[0065] For example, the biological treatment tank 1 is made of a combination of galvanized steel sheet and canvas. The galvanized steel sheet serves as the structural frame and outer shell of the tank. It is a corrosion-resistant metal sheet made by hot-dip galvanizing or electroplating a layer of zinc onto the surface of low-carbon steel sheet. In atmospheric and aquatic environments, the zinc layer can form a dense zinc oxide protective film, effectively isolating the steel substrate from contact with corrosive media, thereby giving the sheet excellent corrosion resistance and a long service life.

[0066] The thickness of the galvanized sheet can be selected according to the diameter and water depth of the biological tank 1. For a small-scale personal aquaculture biological tank 1 with a diameter of 1m to 3m and a water depth of 0.6m to 1.5m, a galvanized sheet thickness of 0.8mm to 1.5mm is usually sufficient to meet the structural strength requirements.

[0067] For example, canvas is used as the inner waterproof lining of the pool. The canvas material can be selected from textile materials with good waterproof performance and water immersion resistance, such as polyvinyl chloride coated canvas, polyester fiber canvas, nylon canvas or polypropylene canvas. The thickness of the canvas is usually 0.3mm to 0.8mm.

[0068] The canvas lining is tightly fitted to the inner wall of the galvanized sheet shell, directly contacting the water in the pool and various components installed inside. The inner surface of the canvas is smooth and flat, making it difficult for biofilm and dirt to adhere, and facilitating regular cleaning and maintenance.

[0069] The connection between the canvas and the galvanized sheet can be achieved by using rivets and waterproof sealing strips to press the edges. That is, a waterproof rubber or silicone sealing strip is placed at the edge of the canvas, and then aluminum alloy or stainless steel rivets are used to rivet the canvas and the sealing strip together to the inner wall of the galvanized sheet, thereby achieving a firm fixation of the canvas lining and a reliable seal at the joint.

[0070] For example, the seams between the canvas panels can be waterproofed using high-frequency heat sealing welding or sewing with adhesive to ensure no water seepage at the seams. The galvanized sheet outer shell is assembled using bolts or snap-fit ​​connections, allowing the entire biochemical tank 1 to be disassembled into several flat panels and a folded canvas lining during transportation and storage, occupying minimal space and facilitating transport and handling. When needed, farmers can assemble it themselves according to the instructions without the need for professional construction personnel.

[0071] Please refer to Figure 1 The top of the biological tank 1 is an open structure, without a top cover or with a movable shade net or cover plate, so as to facilitate daily observation of the water condition in the tank and maintenance operations such as adding and removing artificial filler 7.

[0072] Fish pond 2 is the main container for fish farming. Its shape and material can be flexibly selected according to the actual conditions and preferences of the farmers. Fish pond 2 can be round, square, rectangular or other irregular shapes. The material can be the same galvanized plate with canvas structure as biological pond 1, or it can be a concrete pond, fiberglass molded pond, geomembrane seepage prevention pond or finished plastic aquaculture bucket, etc.

[0073] For example, the volume of fish pond 2 should be rationally designed according to the species, density, and growth stage of the farmed fish to ensure that the fish have sufficient space to move around and suitable water quality conditions. The fish farmed in fish pond 2 can be common freshwater aquaculture species, such as perch, tilapia, crucian carp, grass carp, koi, ornamental fish, etc., or crustaceans such as shrimp and crab.

[0074] For example, the microparticle filter 3 is a water treatment device that uses the principle of microfiltration to physically intercept and separate suspended solids in water. The working principle of the microparticle filter 3 is as follows: wastewater containing solid impurities enters the microparticle filter 3 and passes through one or more layers of filter media (such as stainless steel filter screen, nylon filter cloth, or stacked filter cartridges). Water molecules and dissolved substances can pass through the tiny pores on the filter media, while solid particles with a diameter larger than the pore size are trapped on the surface or inside the filter media, thereby achieving solid-liquid separation.

[0075] During operation, the solid impurities trapped by the particulate filter 3 gradually accumulate on the surface of the filter medium to form a filter cake layer. When the filter cake layer accumulates to a certain extent, the particulate filter 3 removes the filter cake layer from the filter medium and discharges it outside the machine through automatic backwashing or manual cleaning, so that the filter medium can restore its filtration capacity.

[0076] Common microparticle filters can be selected, including drum microfilters, rotary drum microfilters, disc filters, sand filters, and bag filters. For small-scale personal farming, drum microfilters or disc filters with moderate flow rates, small footprint, and easy maintenance are usually sufficient to meet the needs.

[0077] The inlet of the microparticle generator 3 is connected to the fish pond 2 through a water supply pipe, the outlet of the microparticle generator 3 is connected to the biological treatment tank 1 through a water supply pipe, and the sludge discharge port of the microparticle generator 3 discharges the intercepted solid waste outside the system through the sewage discharge pipe 6.

[0078] Please refer to Figure 1 In some examples, the water supply pipe is a pipeline connecting the fish pond 2 and the microparticle generator 3, and its function is to transport the sewage in the fish pond 2 to the microparticle generator 3 for treatment.

[0079] The water supply pipe can be made of water-resistant materials such as polyvinyl chloride, polypropylene, polyethylene, or stainless steel. The pipe diameter is selected according to the system's processing flow rate. For small-scale personal aquaculture, the inner diameter of the water supply pipe is usually 20mm to 50mm.

[0080] One end of the water supply pipe extends into the fish pond 2, and its opening is located in the middle and lower part of the water body of the fish pond 2, so as to collect the bottom water with a high concentration of pollutants. Because fish feces and uneaten food are deposited near the bottom of the pond under the action of gravity, taking water from the bottom can more effectively transfer pollutants from the fish pond 2.

[0081] The other end of the water supply pipe is connected to the inlet of the microparticle generator 3. Wastewater flows from the fish pond 2 into the microparticle generator 3 through the water supply pipe under the suction of the water pump built into the microparticle generator 3 or under the gravity caused by the liquid level difference between the two ponds.

[0082] The connection between the water supply pipe and the wall panel of the fish pond 2 can be sealed by using a pipe joint and a sealing gasket. The connection between the water supply pipe and the inlet of the microparticle generator 3 can be made by flange connection, quick-connect fitting connection or threaded connection.

[0083] Please refer to Figure 1 The water supply pipe connects the microparticle generator 3 and the biological treatment tank 1. Its function is to transport the relatively clean water treated by the microparticle generator 3 to the biological treatment tank 1 for deep biological purification. The material and diameter selection range of the water supply pipe are basically the same as those of the water delivery pipe.

[0084] One end of the water supply pipe is connected to the outlet of the microparticle generator 3, and the other end is connected to the biological treatment tank 1. The pipe extends into the interior of the biological treatment tank 1, and its outlet is usually located in the upper middle part of the water body in the biological treatment tank 1, so that the water from the microparticle generator 3 can be fully mixed with the existing water in the biological treatment tank 1 and enter the oxidation section 11 for biological treatment. The connection between the water supply pipe and the wall panel of the biological treatment tank 1 is also a sealed through-wall connection.

[0085] Please refer to Figure 1 In some examples, the difference in water level between the two pools is the fundamental driving force for the establishment and maintenance of the siphon effect. According to the siphon principle in fluid mechanics, when the pipe connecting the two liquid surfaces is filled with liquid and the highest point of the pipe is lower than or equal to the water level of the higher liquid surface, the liquid will automatically and continuously flow from the higher liquid surface to the lower liquid surface under the combined action of gravity and atmospheric pressure, without the need for an additional power pump.

[0086] Maintaining the water level in the biological treatment tank 1 higher than that in the fish pond 2 is a prerequisite for the normal operation of the siphon water supply function. In actual operation, the water level in the fish pond 2 will gradually decrease due to fish activity, evaporation loss, and continuous pumping by the microparticle generator 3, while the water level in the biological treatment tank 1 will remain at a relatively stable level due to continuous water replenishment from the water supply pipe.

[0087] Please refer to Figure 1 When the water level in fish pond 2 drops to a certain level, the liquid level difference between the two ends of siphon pipe 4 increases, and the siphon flow rate increases accordingly, thereby automatically accelerating the water supply speed to fish pond 2, so that the water level in fish pond 2 gradually rises back to the normal range. The entire adjustment process does not require manual intervention, demonstrating the system's good self-balancing ability.

[0088] The specific value of the water level difference between the two pools can be designed and adjusted according to the scale of the system and the pipeline resistance. For small-scale personal aquaculture scenarios, the difference between the water level of biological pool 1 and the water level of fish pond 2 is usually controlled between 10cm and 40cm to meet the basic requirements of siphon operation.

[0089] If the water level difference is too small, the siphon flow rate may not be enough to compensate for the evaporation and sewage discharge losses of the fish pond 2. If the water level difference is too large, the flow velocity in the siphon pipe 4 may be too fast, resulting in pipe vibration, noise or cavitation. Therefore, it is necessary to perform reasonable hydraulic calculations and matching based on the pipe diameter, pipe length and pipe route of the siphon pipe 4 during the design stage.

[0090] Please refer to Figure 1 In some examples, the water level in biological tank 1 is 80% to 95% of its total height. Biological tank 1 is not fully filled; instead, a certain amount of empty space is reserved above the water surface. This empty space has the following functions and significance.

[0091] First, when the oxygen supply component 5 is working, the microbubbles released from the bottom of the pool will burst and generate tiny water splashes when they rise to the water surface. The empty space provides a buffer area for the water splashes, preventing water from splashing directly out of the pool and causing water loss and humidity to the surrounding environment.

[0092] Secondly, the MBBR suspended packing needs a certain amount of floating space above the water surface to accommodate the packing's up-and-down rolling motion under the action of water flow and air flow, so as to prevent the packing from being squeezed out of the water surface or accumulating on the water surface.

[0093] The spare space also serves as a safety margin to prevent water from overflowing the pool under extreme weather or abnormal operating conditions. The percentage of water height can be selected from 80%, 85%, 90%, and 95%, with 85% to 90% being preferred to balance maximizing the utilization of water volume with sufficient safety margin.

[0094] Please refer to Figure 1Specifically, the water in the biological treatment tank 1 is divided into three functional areas from top to bottom along the direction of gravity: an oxidation section 11, a water supply section 12, and an oxygen supply and wastewater discharge section 13. The heights of the three areas are the same or similar. "Same or similar" means that the height difference between the three areas does not exceed 10% of the total water height, to ensure that each functional area has sufficient space to perform its corresponding function.

[0095] Taking a biological treatment tank 1 with a total water height of 90cm as an example, the height of each of the three functional areas is about 30cm. That is, the oxidation part 11 occupies a water layer about 30cm deep above the water surface, the water supply part 12 occupies a water layer about 30cm deep in the middle, and the oxygen supply and sewage discharge part 13 occupies a water layer about 30cm deep above the bottom of the tank.

[0096] The oxidation section 11 is located at the uppermost layer of the water body, that is, the area close to the water surface. This area is in direct contact with the air, and atmospheric oxygen on the water surface naturally diffuses and dissolves into the water body through the gas-liquid interface. At the same time, the microbubbles generated by the oxygen supply component 5 continuously release oxygen into the water body as they rise from the bottom. When the bubbles reach the water surface and burst, the residual oxygen in the bubbles is also released into the surface water body and the air above it. Therefore, the oxidation section 11 is the area with the highest dissolved oxygen content in the entire biological tank 1.

[0097] Please refer to Figure 1 Artificial filler 7 floats or is suspended in the oxidation section 11. The aerobic microorganisms such as nitrifying bacteria and nitrite bacteria attached to the surface of the filler are most active and have the highest metabolic rate in a high dissolved oxygen environment. They can efficiently oxidize ammonia nitrogen in the water into nitrite, and then further oxidize it into nitrate with extremely low toxicity, thereby achieving the biodegradation of harmful nitrogen-containing compounds.

[0098] In addition, the oxidation section 11 is close to the water surface, where the gas exchange between the water surface and the air is most active. The water in this area can also decompose the residual dissolved organic matter that the particulate matter 3 failed to remove completely into carbon dioxide and water through the dissimilar action of microorganisms, further reducing the biochemical oxygen demand of the water.

[0099] Please refer to Figure 1 The water supply section 12 is located in the middle layer of the water body, that is, the area between the oxidation section 11 and the oxygen supply and sewage discharge section 13. The water in this area has been fully biologically treated by the upper oxidation section 11, and the concentrations of ammonia nitrogen and nitrite have been greatly reduced. The dissolved oxygen content is moderate, and the water quality is in a relatively optimal state in the entire biological treatment tank 1, making it suitable as the water intake layer for supplying water to the fish pond 2.

[0100] Please refer to Figure 1The siphon 4 has its inlet located at the water supply section 12, submerged in the water of that area. The siphon 4 draws water from this layer and delivers it to the fishpond 2. The selection of the middle layer as the water intake point, rather than the surface or bottom layer, is based on the following technical considerations: While the surface water has the highest dissolved oxygen, it may contain impurities such as scum, grease films, or floating packing debris due to surface tension. Introducing these impurities into the fishpond 2 could affect the fish's normal respiration and the water's appearance. The bottom layer may contain fine suspended matter settling from the top or particles temporarily stirred up by the oxygen supply flow, making it less clear than the middle layer. Therefore, drawing water from the middle layer ensures optimal water quality while avoiding the introduction of unnecessary impurities, maximizing the quality of the water supply.

[0101] The oxygen supply and sewage discharge section 13 is located at the bottom of the water body, that is, in the area close to the bottom wall of the biological treatment tank 1. The oxygen supply component 5 is installed on the bottom wall of the biological treatment tank 1, and the outlet of the sewage discharge pipe 6 also penetrates the bottom wall panel of the biological treatment tank 1. Both are located in this area.

[0102] The oxygen supply component 5 releases microbubbles into the water above. As the bubbles rise, they cause the bottom water to surge upward, forming a water circulation from bottom to top, which promotes uniform mixing and dissolved oxygen distribution in the entire biological tank 1.

[0103] Please refer to Figure 1 The outlet of the sewage pipe 6 is located at the bottom of the pool. Utilizing the natural sedimentation and sludge collection characteristics of the pool bottom, the solid sludge that gradually settles at the bottom of the pool is promptly discharged from the system. Although the oxygen supply component 5 and the sewage pipe 6 are located in the same functional area within the oxygen supply and sewage discharge section 13, they are distributed relatively alternately in the horizontal direction. That is, the air supply pipe 52 or air outlet 55 of the oxygen supply component 5 is not installed at the outlet of the sewage pipe 6, and a sufficient horizontal distance is maintained between them.

[0104] This spaced distribution design ensures that the rising airflow and upward water circulation generated when the oxygen supply component 5 is working will not directly affect the water condition around the outlet of the sewage pipe 6. The water at the outlet of the sewage pipe 6 is relatively calm, and the sediment can settle naturally and be discharged by the sewage pipe 6 without disturbance, thus ensuring the independence and effectiveness of the sewage discharge function.

[0105] Meanwhile, the sewage discharge process will not affect the normal operation of the oxygen supply component 5. The sewage pipe 6 is only opened briefly when sewage discharge is required. Only local sediments at the bottom of the pool are discharged, which will not cause significant disturbance to the overall water circulation and dissolved oxygen distribution above the area covered by the oxygen supply component 5.

[0106] In summary, the three functional areas inside the biological treatment tank 1 each perform their own functions without interfering with each other: the oxidation section 11 focuses on biodegradation, the water supply section 12 focuses on providing clean water, and the oxygen supply and sewage discharge section 13 focuses on oxygen supply and sewage discharge.

[0107] Please refer to Figure 1 The four core functions—oxygen supply, oxidation, water supply, and sewage discharge—are clearly separated in space and coordinated in time through the overall circulation of water: oxygen supply provides the necessary dissolved oxygen source for oxidation, oxidation treatment provides qualified water for water supply, sewage discharge ensures the continuous clean operation of the entire system, and water supply maintains the water balance between fish pond 2 and biological pond 1.

[0108] This design of independent partitions and collaborative operation gives the system a high degree of fault tolerance. Even if a certain functional link experiences a temporary abnormal fluctuation, its impact is limited to the corresponding functional area and will not spread to other areas and cause the system to fail completely. This provides individual small-scale farmers with ample time to discover and deal with problems.

[0109] In some examples, the artificial packing material 7 is a functional material that provides an attachment and growth carrier for beneficial microorganisms such as nitrifying bacteria. When microorganisms exist in a planktonic state in the water, they are easily lost with the water flow, while the biofilm formed on the surface of the packing material can stably reside in the biological treatment tank 1 and continuously play a role in water purification.

[0110] The preferred artificial packing material 7 is MBBR suspended packing. MBBR is an abbreviation for moving bed biofilm reactor. MBBR suspended packing is a lightweight biological carrier packing material specifically designed and manufactured for this process. MBBR suspended packing comes in various shapes, commonly including cylindrical, spherical, short tubular, annular, cross-shaped, and honeycomb structures. The individual size of the packing material is usually between 10mm and 25mm, depending on the type of packing material and the manufacturer's design.

[0111] MBBR suspended packing is typically made of high-density polyethylene, polypropylene, or polyurethane, among other polymeric synthetic materials. The density of these materials is precisely adjusted to be close to that of water, thus ensuring that the packing can float naturally in the water without sinking to the bottom or floating to the surface.

[0112] Meanwhile, these polymer materials have excellent resistance to water corrosion, UV aging, and microbial degradation. They will not deteriorate or release harmful substances when immersed in water for a long time.

[0113] The surface of the MBBR suspension packing is specially processed to give it suitable roughness and microporous structure, providing a good microenvironment for the initial attachment of microorganisms and the growth of biofilm.

[0114] When in use, the MBBR suspended packing floats or suspends in the oxidation section 11 of the water in the biological treatment tank 1. Since the oxidation section 11 is located at the top of the water and has the highest dissolved oxygen content, the MBBR packing continuously tumbles and moves with the water and air flow in this area. The biofilm on the surface of the packing alternately contacts the oxygen in the water and air, achieving efficient material transfer and biological reaction.

[0115] The movement characteristics of the packing material also cause the old biofilm on its surface to fall off naturally under mechanical collision and hydraulic shearing, exposing a fresh biofilm surface, ensuring that the overall activity and treatment efficiency of the biofilm remain at a high level.

[0116] The filling rate of MBBR suspended packing is usually controlled at 30% to 67% of the effective volume of the oxidation section 11 of the biological treatment tank. If the filling rate is too low, the biofilm area will be insufficient and the treatment effect will be affected. If the filling rate is too high, it will restrict the free movement space of the individual packings, reduce the collision frequency and mass transfer efficiency between the packings, and may also cause the packings to accumulate and crowd in local areas.

[0117] Please refer to Figure 1 In some examples, the siphon 4 is the core pipeline component connecting the biological treatment tank 1 and the fish tank 2, enabling automatic water supply. The siphon 4 has an inverted U-shape or arched structure. Its working principle is to use the pressure difference generated by the difference in liquid level between the two tanks to drive the water to flow automatically through the pipeline, without the need for an additional power pump.

[0118] The siphon tube 4 can be made of rigid plastic pipes such as polyvinyl chloride pipe, polypropylene pipe or food-grade polyethylene pipe. The pipe should have sufficient rigidity to prevent excessive bending deformation due to its own weight when the pipe is overlapped with the edge of the pool. At the same time, the inner wall of the pipe should be smooth to reduce water flow resistance.

[0119] For small-scale personal aquaculture, the inner diameter of the siphon pipe 4 is usually selected from 20mm to 40mm, with the specific diameter chosen based on the system's water supply flow requirements. The total length of the siphon pipe 4 should be sufficient to span the distance between the biological treatment pond 1 and the fish pond 2 and ensure that the pipe opening can extend into both ponds to the predetermined position, typically between 0.8m and 3m.

[0120] The present invention defines that the two openings of the siphon 4 extend into the biological treatment tank 1 and the fish tank 2 respectively, and the siphon 4 overlaps the top edge of the biological treatment tank 1 and the fish tank 2. The highest point of the arch in the middle of the siphon 4 rests above the top edge of the adjacent side of the biological treatment tank 1 and the fish tank 2, and the pipe crosses the space between the two tanks from this point.

[0121] One end of the siphon pipe 4 extends into the biological tank 1 and downwards along the inner wall of the biological tank 1 to the area of ​​the water supply section 12. Its pipe opening is submerged in the water of the water supply section 12. The distance between the pipe opening and the bottom of the tank is about 1 / 3 to 1 / 2 of the total height of the water in the biological tank 1, that is, it is roughly located in the middle of the water supply section 12.

[0122] One end of the siphon pipe 4 extends downward along the inner wall of the fish pond 2, with its opening located above the water in the fish pond 2. The installation method of the siphon pipe 4 overlapping the top edge of the two ponds means that the pipe itself does not need to pass through the pond wall, and there is no need to make a through hole for the siphon pipe 4 in the pond structure, thus avoiding the sealing problems and leakage problems that may occur due to the opening.

[0123] The overlapping installation method also makes the installation and disassembly of the siphon pipe 4 extremely simple. Farmers only need to put both ends of the pipe into the two pools respectively and place the middle part of the pipe on the edge of the pool to complete the installation. The whole process does not require any tools or professional skills.

[0124] When it is necessary to clean, replace or adjust the position of the siphon pipe 4, farmers only need to remove the pipe from the edge of the pond. The operation is quick and convenient and will not affect the pond structure or aquaculture operations.

[0125] The way the siphon pipe 4 is connected to the edge of the pond also provides farmers with the convenience of flexibly adjusting the distance between the two ponds and the direction of the pipeline. Farmers can freely adjust the distance and relative position between the biological pond 1 and the fish pond 2 according to the actual spatial layout of the breeding site. The siphon pipe 4 only needs to be adjusted accordingly in terms of the span length and the depth of insertion to adapt to different layout schemes.

[0126] The design of the pipe outlets suspended above the water surface also provides the system with an intuitive indication of its operating status: during routine inspections, farmers only need to observe whether there is a continuous and stable flow of water from the four inlets of the siphon pipe to quickly determine whether the siphon system is working properly. If there is a continuous and even flow of water from the inlets, it indicates that the siphon is functioning normally and the system is operating normally; if there is no water flowing from the inlets or the flow is intermittent, weak, or contains air bubbles, it indicates that the siphon may have been interrupted or the pipeline may be blocked, and farmers can immediately check and handle the situation accordingly.

[0127] The intuitive and visual fault indication method eliminates the need for any monitoring instruments or sensors, reducing the complexity and technical threshold of system monitoring. The design of the pipe opening not being immersed in water also physically isolates foreign objects such as fish, aquatic plants, uneaten food, suspended matter, or surface foam in fish pond 2 from being sucked back into the pipe by the suction of siphon pipe 4. This fundamentally eliminates the hidden danger of siphon pipe 4 being blocked by foreign objects, ensuring the long-term smooth operation of siphon pipe 4.

[0128] Please refer to Figure 1 and Figure 3In some examples, the baffle plate 8 is a physical shielding plate set below the opening of the siphon pipe 4 inside the biochemical tank 1. Its core function is to prevent rising air bubbles generated when the oxygen supply component 5 is working from entering the opening of the siphon pipe 4 and causing air resistance failure in the siphon pipe 4.

[0129] The material of the air baffle 8 can be stainless steel plate, galvanized steel plate, rigid polyvinyl chloride plate, polypropylene plate or acrylic plate, etc., which have certain structural rigidity, water corrosion resistance and chemical stability.

[0130] The shape of the baffle plate 8 is usually a flat plate or arc plate that is round, square or oval. The specific shape should be selected according to the shape of the siphon pipe 4 opening and the spatial layout inside the biochemical pool 1, with round being the most common.

[0131] The dimensions of the baffle plate 8 should meet the following requirements: along the direction of gravity, i.e., the vertical direction, the water inlet area of ​​the siphon pipe 4 is completely projected onto the baffle plate 8. That is, when viewed from directly above, the area of ​​the baffle plate 8 should be greater than or equal to the projected area of ​​the siphon pipe 4 opening on the horizontal plane, so as to ensure that the baffle plate 8 can completely block the water inlet area below the opening, so that the air bubbles rising from below cannot directly reach any position directly below the opening, but can only detour around the horizontal edge of the baffle plate 8.

[0132] For example, when the inner diameter of the siphon tube 4 is 30 mm, the diameter of the tube opening is about 30 mm, and the diameter of the baffle plate 8 can be selected from 60 mm to 100 mm to provide sufficient shielding area and edge bypass distance.

[0133] The baffle plate 8 is fixedly installed relative to the biological treatment tank 1, that is, the baffle plate 8 is connected and fixed to the inner wall or bottom structure of the biological treatment tank 1 through a support member. The support member can be in the form of angle steel bracket, stainless steel stud, plastic column or welded connecting plate, etc.

[0134] The lower end of the support is fixed to the bottom or side wall of the biological tank 1, and the upper end is fixedly connected to the lower surface of the baffle plate 8. The height of the support determines the specific spatial position of the baffle plate 8 within the biological tank 1. The position of the baffle plate 8 should be exactly below the inlet of the siphon pipe 4, so that the center of the baffle plate 8 and the center of the inlet of the siphon pipe 4 are on the same vertical axis or as close as possible.

[0135] The working principle of the air baffle 8 is as follows: When the oxygen supply component 5 at the bottom of the biological tank 1 is running, the oxygenation pump 51 sends compressed air into the air supply pipe 52 through the air supply pipe 54, and then releases a large number of microbubbles into the water body through the air outlet 55 on the air supply pipe 52. These microbubbles move upward from the bottom of the tank due to buoyancy, and gradually dissolve oxygen into the surrounding water body during the rising process.

[0136] When bubbles rise to the vicinity of the siphon pipe 4 opening, without the obstruction of the baffle plate 8, the local water flow generated by the siphon suction at the opening of siphon pipe 4 may engulf some bubbles into the pipe opening, causing bubbles to enter siphon pipe 4. Once gas is mixed into siphon pipe 4, the full water flow state in the pipe is disrupted, forming an intermittent flow of alternating gas and liquid. In severe cases, a continuous gas column section will form in the pipe, completely blocking the continuous flow of water, causing the siphon effect to be interrupted, and the biological treatment tank 1 will be unable to supply water to the fish pond 2.

[0137] The presence of the baffle plate 8 effectively solves this problem: when the rising bubbles reach the lower surface of the baffle plate 8, they are blocked by the solid surface of the baffle plate 8 and cannot continue to move upward. They can only flow horizontally around the bottom and edge of the baffle plate 8. During the process of the bubbles flowing around from the edge of the baffle plate 8 to the area above the baffle plate 8, because the direction of movement of the bubbles changes from vertically upward to horizontal and then to obliquely upward, their trajectory is greatly extended. At the same time, when the bubbles flow horizontally, they are more likely to be carried away by the horizontal flow component of the surrounding water and deviate from the water inlet area of ​​the siphon pipe 4. This significantly reduces the probability that the bubbles will eventually reach the pipe opening and be sucked into the siphon pipe 4.

[0138] The air baffle 8 is a purely passive anti-air lock structure. It does not require any electric drive, electronic sensors or control programs. It can achieve the function of preventing air bubble interference by relying solely on the blocking effect of a physical plate. The structure is extremely simple, the cost is extremely low, and the reliability is extremely high. Even during long-term use, it is not easy to fail or experience performance degradation. It is very suitable for promotion and application in personal small-scale breeding systems.

[0139] Please refer to Figure 1 and Figure 3 In some examples, the distance between the baffle plate 8 and the siphon tube 4 is less than or equal to the radius of the siphon tube 4. This distance refers to the shortest vertical distance between the upper surface of the baffle plate 8 and the lower edge of the siphon tube 4 opening. The setting of this distance parameter directly affects the anti-bubble effect of the baffle plate 8. When the distance is too large, bubbles have enough space to move upward and diffuse to the vicinity of the opening after bypassing the edge of the baffle plate 8, thus weakening the shielding effect of the baffle plate 8. When the distance is too small, bubbles quickly enter the narrow space between the opening and the baffle plate 8 after bypassing the edge of the baffle plate 8. In this space, the water flow velocity is faster and the direction is towards the opening, increasing the probability of bubbles being sucked into the opening. However, overall, since the probability of bubbles reaching this space has been greatly reduced by the baffle plate 8, the overall effect of a smaller distance is still better than that of a larger distance.

[0140] When the spacing is less than or equal to the radius of the siphon tube 4, the horizontal distance that the bubble travels from the edge of the baffle plate 8 to the pipe opening is at least equal to the width of the baffle plate 8 extending beyond the edge of the pipe opening plus the radius of the pipe opening. The bubble needs to travel a long path to reach the pipe opening. During this path, the bubble is subjected to the combined effect of its own buoyancy and the surrounding water flow, and most of them will be carried away from the pipe opening area, thus ensuring to the greatest extent possible that the water drawn by the siphon tube 4 does not contain bubbles.

[0141] When the inner diameter of the siphon tube 4 is 20mm (i.e., the radius is 10mm), the distance between the baffle plate 8 and the tube opening can be set to 5mm~10mm; when the inner diameter of the siphon tube 4 is 30mm (i.e., the radius is 15mm), the distance can be set to 8mm~15mm; when the inner diameter of the siphon tube 4 is 40mm (i.e., the radius is 20mm), the distance can be set to 10mm~20mm.

[0142] The height of the support components can be precisely adjusted during installation according to the aforementioned spacing requirements. Fine-tuning can be achieved by screwing in and out the threaded section on the support component, or coarse-tuning can be achieved by selecting support columns of different lengths. Aquaculture farmers only need to measure the diameter of the siphon pipe 4 and adjust the height of the baffle plate 8 accordingly to complete the standard installation; no professional hydraulic knowledge or precision measuring instruments are required.

[0143] In some examples, the oxygenation pump 51 is the power source for the oxygen supply assembly 5, and its function is to pressurize ambient air and deliver it through pipelines to the air supply pipe 52 system in the biological treatment tank 1. The oxygenation pump 51 can be a Roots blower, a vortex pump, an electromagnetic air pump, or a piston air pump, etc.

[0144] For small-scale personal farming, an electromagnetic air pump or a small vortex air pump with a power between 20W and 500W is usually sufficient to meet the oxygen supply needs. These pumps have the advantages of small size, low noise, low energy consumption and moderate price, and are suitable for use in environments with certain noise requirements, such as residential areas or rural courtyards.

[0145] The aerator pump 51 is located outside the biological treatment tank 1. Its installation location should be chosen in a well-ventilated, dry place away from the water surface to prevent water vapor from condensing and entering the pump body, causing short circuits in the motor windings or corrosion of metal parts. The air outlet of the aerator pump 51 is connected to the air supply pipe 54 through a pipeline, and compressed air is sent to the make-up air pipe 52 system inside the biological treatment tank 1 through the air supply pipe 54.

[0146] Please refer to Figure 1 and Figure 2 The gas supply pipe 52 is an annular pipe in the oxygen supply assembly 5 that directly releases gas onto the bottom wall of the biological tank 1. There are at least two gas supply pipes 52, and the diameters of the at least two gas supply pipes 52 are different and independent of each other. The at least two gas supply pipes 52 are coaxially arranged.

[0147] Please refer to Figure 2 In some embodiments, two, three, or four air supply pipes 52 may be provided. Taking three air supply pipes 52 as an example, the three air supply pipes 52 are an inner ring air supply pipe 52, a middle ring air supply pipe 52, and an outer ring air supply pipe 52. The inner ring air supply pipe 52 has the smallest diameter, and its annular diameter can be selected from 100mm to 200mm; the middle ring air supply pipe 52 has a medium diameter, and its annular diameter can be selected from 250mm to 400mm; the outer ring air supply pipe 52 has the largest diameter, and its annular diameter can be selected from 450mm to 700mm.

[0148] All three air supply pipes 52 are closed loop pipes. The pipes can be made of water-resistant and corrosion-resistant materials such as polyvinyl chloride pipes, polypropylene pipes, or stainless steel pipes, which have a certain rigidity. The outer diameter of the pipes is usually between 16mm and 32mm.

[0149] The three air supply pipes 52 are coaxially arranged, that is, the centers of the three annular air supply pipes 52 coincide, and the center is located at or near the center point of the bottom wall of the biological treatment tank 1. The three air supply pipes 52 are spread out on the bottom wall of the biological treatment tank 1 in the form of concentric circles, forming a triple concentric annular oxygen supply layout.

[0150] Each air supply tube 52 is independent of each other, that is, each air supply tube 52 is a closed ring pipe, and its internal air chamber is isolated from the air chamber of the adjacent air supply tube 52 before being connected by the connecting pipe 53.

[0151] At least three connecting pipes 53 are provided between two adjacent air supply pipes 52. The connecting pipe 53 is a short, straight pipe section made of the same material as the air supply pipe 52. The two ends of the connecting pipe 53 are connected to the pipe walls of the two adjacent air supply pipes 52 by means of pipe joints, tee joints, or hot-melt welding, so that compressed air can flow freely between the cavities of the adjacent air supply pipes 52.

[0152] The connecting pipes 53 are evenly distributed along the annular gap between two adjacent air supply pipes 52. For example, when three connecting pipes 53 are provided, the three connecting pipes 53 are distributed at 120° intervals along the circumference; when four connecting pipes 53 are provided, the four connecting pipes 53 are distributed at 90° intervals along the circumference.

[0153] Please refer to Figure 1 and Figure 2 All connecting pipes 53 are independent of each other, that is, each connecting pipe 53 only connects to its two adjacent air supply pipes 52, and does not directly connect to other air supply pipes 52 across the middle air supply pipe 52.

[0154] For example, the connecting pipe 53 connecting the inner ring air supply pipe 52 and the middle ring air supply pipe 52 is only connected to these two air supply pipes 52 and not connected to the outer ring air supply pipe 52; the connecting pipe 53 connecting the middle ring air supply pipe 52 and the outer ring air supply pipe 52 is also only connected to these two air supply pipes 52 and not connected to the inner ring air supply pipe 52.

[0155] This independent connection structure ensures that the compressed air delivery path between each air supply pipe 52 is clear and controllable, while also providing a certain degree of redundancy: even if a certain connecting pipe 53 loses its connection function due to blockage or damage during use, the remaining connecting pipes 53 can still maintain the air path connection between adjacent air supply pipes 52, ensuring that the air supply function of the entire air supply pipe 52 system is not affected.

[0156] The air supply pipe 54 is the main air supply pipe connecting the oxygenation pump 51 and the make-up air pipe 52 system. One end of the air supply pipe 54 is connected to the outermost make-up air pipe 52, i.e., the outer ring make-up air pipe 52. The air supply pipe 54 and the outer ring make-up air pipe 52 are connected by a T-joint or pipe joint, so that the compressed air output by the oxygenation pump 51 can enter the cavity of the outer ring make-up air pipe 52 from the air supply pipe 54.

[0157] Please refer to Figure 1 and Figure 2 The other end of the air supply pipe 54 passes through the wall panel of the biological tank 1 and extends to the outside of the biological tank 1, connecting with the air outlet of the aeration pump 51. When the air supply pipe 54 passes through the wall panel of the biological tank 1, the outer wall of the air supply pipe 54 is sealed to the biological tank 1. The sealing method can be a flange with a rubber gasket, a pipe joint with an O-ring, a hot melt welding connection, or a sealant injection sealing connection, etc., to ensure the airtightness of the wall penetration, prevent compressed air from leaking out of the tank from the wall penetration, and also prevent debris and insects from entering the tank from the wall penetration.

[0158] The gas supply pipe 54 can be made of polyvinyl chloride, polypropylene or stainless steel. The pipe diameter is usually between 20mm and 40mm. It should meet the requirements of moderate airflow velocity and low pressure drop in the pipeline under the rated flow of the oxygen pump 51.

[0159] The portion of the air supply pipe 52 facing the top of the biochemical tank 1 is provided with multiple air outlets 55. That is, the air outlets 55 are opened on the upper semi-circular arc surface of the circular cross-section of the air supply pipe 52, and the opening direction of the air outlets 55 is upward, so that the compressed air escapes from the air outlets 55 and is released into the water body above in the form of microbubbles.

[0160] Multiple air outlets 55 are distributed circumferentially around the air supply pipe 52, with the spacing between the air outlets 55 being uniformly arranged along the annular direction of the air supply pipe 52 to ensure uniform gas release along the entire length of the air supply pipe 52. The diameter of the air outlets 55 is 2mm~10mm. The selection of the aperture needs to be balanced between bubble size and air supply resistance: when the aperture is smaller, the bubbles are cut into smaller bubbles by water pressure and surface tension when escaping from the orifice. The bubbles have small diameters, large specific surface areas, slow rising speeds, and long residence times in the water, resulting in high oxygen transfer efficiency to the water body. However, this also places higher demands on the air supply pressure of the aerator pump 51. When the aperture is larger, the bubbles have larger diameters, relatively smaller specific surface areas, faster rising speeds, and shorter residence times, resulting in relatively lower oxygen transfer efficiency. However, this also places lower demands on the air supply pressure, and the operating load on the aerator pump 51 is lighter.

[0161] Please refer to Figures 1-3 In some embodiments, the diameter of the air outlet 55 can be selected from specifications such as 2mm, 3mm, 4mm, 5mm, 6mm, 8mm or 10mm. For small-scale personal aquaculture scenarios, it is more suitable to select an air outlet 55 with a diameter of 3mm to 6mm. This range can ensure good oxygen transfer efficiency without placing excessive pressure requirements on the aerator 51.

[0162] The number of air outlets 55 is determined based on the length of the air supply pipe 52 and the spacing between the holes. Typically, the spacing between adjacent air outlets 55 on each air supply pipe 52 is 20mm to 50mm to ensure that the bubbles generated by adjacent air outlets 55 do not merge into large bubbles when they rise to the upper layer of the water, thus maintaining the fine and dispersed state of the bubbles.

[0163] The total number and distribution range of air outlets 55 on all air supply pipes 52 should match the requirement that the oxygen supply component 5 covers 60% to 85% of the bottom wall area of ​​the biological tank 1, so that the air bubbles released from the air supply pipes 52 can cover the water above most of the bottom area of ​​the tank, achieving extensive and uniform oxygen supply.

[0164] Please refer to Figure 1 In some examples, the system is equipped with two sewage pipes 6, which are responsible for sewage discharge in different stages. The first sewage pipe 6 is installed on the biological treatment tank 1, and its opening passes through the bottom wall of the biological treatment tank 1, directly connecting to the internal space of the biological treatment tank 1. The opening is located on the bottom wall of the biological treatment tank 1 and in the area of ​​the oxygen supply and sewage discharge section 13.

[0165] The location of the pipe opening is relatively spaced from the oxygen supply component 5, meaning that no air supply pipe 52 or air outlet 55 is installed on the bottom wall area where the pipe opening is located. The bottom wall area around the pipe opening is relatively calm, without the interference of rising water flow caused by air bubbles. This layout allows solid sediments at the bottom of the pool to gradually settle to the area near the pipe opening under the action of gravity without being agitated by airflow. When the drain pipe 6 is opened, the sediments enter the drain pipe 6 through the pipe opening under the combined action of gravity and pipe suction and are discharged from the system.

[0166] The first sewage pipe 6 discharges mainly solid or semi-solid impurities that gradually settle at the bottom of the biological treatment tank 1 due to the biological treatment process. These impurities include, but are not limited to, fish feces fragments, uneaten feed debris, aging and detached biofilm fragments, dead microbial remains, sludge formed by the settling of suspended solids, and other solid sediments generated during aquaculture and water treatment. The first sewage pipe 6 extends from the bottom opening of the biological treatment tank 1 to the outside of the tank, with its sewage outlet located in the designated sewage discharge area.

[0167] The opening of the second drain pipe 6 is located inside the microparticle generator 3. The opening is located in the sludge collection tank or slag discharge chamber of the microparticle generator 3. The solid dirt trapped in the microparticle generator 3 during the solid-liquid separation process is collected in the sludge collection tank or slag discharge chamber. When the drain pipe 6 is opened, the dirt enters the drain pipe 6 through the opening under the push of gravity or the flushing water flow inside the microparticle generator 3 and is discharged outside the microparticle generator 3.

[0168] The second drain pipe 6 discharges mainly fish feces, uneaten feed particles, scales, mucus clumps, and other solid suspended matter with a particle size larger than the pore size of the filter medium of the microparticle machine 3, which are intercepted in the wastewater of the fish pond 2 by the microparticle machine 3. The pipe of the second drain pipe 6 extends from the inside of the microparticle machine 3 to the outside of the microparticle machine 3, and its waste outlet is also located in the area used for wastewater discharge.

[0169] The sewage outlets of the two sewage pipes 6 can be located in areas such as sedimentation tanks, septic tanks, oxidation ponds, artificial wetlands, or sewage pipe network terminals approved by the environmental protection department. The specific destination should be determined according to local environmental regulations and the actual supporting conditions of the farm.

[0170] The drain pipe 6 can be made of corrosion-resistant materials such as polyvinyl chloride (PVC), polypropylene (PP), or polyethylene (PE), with a diameter typically between 20mm and 50mm to ensure that solid waste can pass through the pipe smoothly without clogging. The drain pipe 6 should maintain a certain slope to allow waste to flow naturally under gravity within the pipe, preventing horizontal or arched sections that could lead to waste accumulation and blockage.

[0171] For example, it may also include a sewage pump, which may be installed outside the biological tank 1. Its inlet end is connected to the sewage pipe 6 at the bottom of the biological tank 1 through a pipeline, and its outlet end is connected to the dirty outlet section of the sewage pipe 6 or directly connected to the sewage discharge area.

[0172] The type of sewage pump can be a small submersible sewage pump, a self-priming sewage pump, or a pipeline sewage pump. The function of the sewage pump is to provide power to the sewage pipe 6 on the biological treatment tank 1. When the sewage pump is running, the impeller inside the pump body rotates to generate negative pressure suction, which draws the water and sediment at the bottom of the sewage pipe 6 into the sewage pipe 6 and discharges it through the pump body to the sewage area downstream of the pipeline.

[0173] The introduction of sewage pumps has upgraded the sewage discharge process from a passive mode that relies on gravity to an active mode driven by pump force, greatly improving sewage discharge efficiency. Even if the sediment at the bottom of the pool is viscous or the sewage pipe is long and the pipe route is undulating, the sewage pump can provide enough driving force to discharge the dirt smoothly.

[0174] The sewage pump can be started and stopped manually or semi-automatically by setting a fixed sewage discharge schedule through a timer. Farmers can flexibly formulate sewage discharge plans based on factors such as stocking density, daily feed amount, water quality monitoring data and seasonal changes, and establish a regular sewage discharge management procedure.

[0175] The sewage pump is in the off state during normal operation and does not affect the normal water flow zoning and oxygen supply operation inside the biological treatment tank 1. It is only briefly started when there is a planned sewage discharge time or when emergency sewage discharge is needed.

[0176] In other examples, the sewage pump can be directly installed in the biological tank 1, and the sewage can be directly rolled into the sewage pipe 6 by the impeller or other structure, which can also achieve the expected sewage discharge effect.

[0177] In some examples, the waste discharged from the drain pipe 6 includes, but is not limited to, feces and uneaten feed sediment. Feces are the most significant endogenous pollutant in aquaculture. The feces excreted by fish through their digestive system contain large amounts of nutrients such as organic carbon, nitrogen, and phosphorus, as well as undigested feed residue, and may also carry harmful microorganisms such as pathogenic bacteria and parasite eggs.

[0178] When feces enter the water, they consume large amounts of dissolved oxygen through microbial decomposition, while releasing toxic and harmful substances such as ammonia nitrogen, nitrite, and hydrogen sulfide, severely deteriorating the water quality. Uneaten feed is the most significant exogenous pollutant in aquaculture. Due to the difficulty in precisely controlling the amount of feed and individual differences in fish feeding behavior, a certain proportion of feed is always not consumed by the fish in time and sinks to the bottom of the pond or remains suspended in the water.

[0179] Similar to feces, uneaten feed contains abundant organic nutrients. When it decomposes in water, it also consumes a large amount of dissolved oxygen and releases harmful substances. Furthermore, the waste discharged from drain pipe 6 may include, but is not limited to, the following: scales and mucus naturally shed by fish during activity; these substances also consume dissolved oxygen and increase the organic load on the water as they gradually degrade in the water; biofilm fragments that age and detach in biological tank 1 and settle to the bottom; these fragments, although partially mineralized, still contain certain organic components; and various suspended solid particles larger than the filter pore size that are retained during the solid-liquid separation process of microparticle separator 3, including tiny feed powders, silt particles, and algal residues.

[0180] Farmers can judge the operating status of each link of the system and whether the sewage discharge effect is normal by regularly observing the sensory characteristics such as color, odor, turbidity and quantity of the sewage discharged from the sewage pipe 6, thereby establishing a regularized farming inspection system based on sewage observation.

[0181] This application provides Embodiment 1, a small-scale recirculating aquaculture system for ornamental fish suitable for indoor balcony or courtyard settings.

[0182] The biological tank 1 of this system is cylindrical, with an inner diameter of 60cm and a total height of 80cm. The water level is 68cm, accounting for 85% of the total height. Biological tank 1 uses a 0.38mm thick galvanized steel sheet as its outer frame, lined with a 0.5mm thick polyvinyl chloride coated canvas as a waterproof layer. The canvas is secured to the inner wall of the galvanized steel sheet using aluminum alloy rivets and silicone sealing strips. The top edge of biological tank 1 is folded outwards to form a rolled edge, increasing structural rigidity and preventing edge cuts.

[0183] The water in biological treatment tank 1 is divided into three sections from top to bottom along the direction of gravity: an oxidation section 11, a water supply section 12, and an oxygen supply and wastewater discharge section 13, each approximately 22 cm high. The oxidation section 11 is located at a depth of 0-22 cm below the water surface and is filled with floating MBBR suspended packing material. The packing material is made of cylindrical polyethylene with a monomer diameter of 15 mm, a specific surface area of ​​800 m² / m³, and a packing volume of 40% of the effective volume of the oxidation section 11. The water supply section 12 is located at a depth of 22-44 cm below the water surface. The oxygen supply and wastewater discharge section 13 is located at a depth of 44-68 cm below the water surface.

[0184] Fish pond 2 is a pre-made round plastic breeding tank with an inner diameter of 80cm and a water level of 40cm. Fish pond 2 is stocked with koi ornamental fish at a stocking density of one koi with a body length of about five centimeters per ten liters of water.

[0185] The microparticle filter 3 uses a small drum-type microfilter with a filtration accuracy of 200 mesh and a processing flow rate of 200L / h.

[0186] Biological tank 1 and fish tank 2 are connected by a 25mm inner diameter polyvinyl chloride siphon pipe 4. The siphon pipe 4 has an inverted U-shape and overlaps the top edges of adjacent sides of biological tank 1 and fish tank 2. One end of the siphon pipe 4 extends downwards to the middle of the water supply section 12, with the pipe opening approximately 44cm from the bottom of the tank. The other end of the siphon pipe 4, extending into fish tank 2, is suspended approximately 5cm above the water level in fish tank 2. The water level in biological tank 1 is approximately 28cm higher than the water level in fish tank 2.

[0187] A circular stainless steel baffle plate 8 is installed inside the biological treatment tank 1. The baffle plate 8 has a diameter of 70 mm and a thickness of 1.5 mm, and is fixed to the bottom wall of the biological treatment tank 1 by a stainless steel stud. The baffle plate 8 is located directly below the inlet of the siphon pipe 4 inside the biological treatment tank 1, and the water inlet area of ​​the pipe is completely projected onto the baffle plate 8. The distance between the upper surface of the baffle plate 8 and the lower edge of the inlet of the siphon pipe 4 is 10 mm, which is equal to the radius of the siphon pipe 4.

[0188] The oxygen supply assembly 5 includes a 35W electromagnetic oxygenation pump 51, two annular PVC air supply pipes 52, four PVC connecting pipes 53, and one PVC air supply pipe 54. The two air supply pipes 52 are an inner annular air supply pipe 52 and an outer annular air supply pipe 52, respectively. The annular diameter of the inner annular air supply pipe 52 is 150mm, and the annular diameter of the outer annular air supply pipe 52 is 400mm. The outer diameter of both air supply pipes 52 is 20mm. The two air supply pipes 52 are coaxially arranged, with their centers located at the center of the bottom wall of the biological treatment tank 1.

[0189] Four connecting pipes 53 are installed between two adjacent air supply pipes 52. The connecting pipes 53 are evenly spaced at 90° intervals along the circumference. The two ends of the connecting pipes 53 are connected to the two air supply pipes 52 respectively through T-joints. One end of the air supply pipe 54 is connected to the outer ring air supply pipe 52 through a T-joint, and the other end extends through the wall panel of the biological treatment tank 1 to the outside of the tank and is connected to the air outlet of the aeration pump 51. The air supply pipe 54 is sealed with a flange and a rubber gasket where it passes through the wall panel.

[0190] An air outlet 55 is provided on the upper semi-circular surface of the air supply pipe 52 facing the top of the pool. The diameter of the air outlet 55 is 4mm, and the distance between adjacent air outlets 55 is 30mm. They are evenly distributed along the circumference of the air supply pipe 52. The oxygen supply component 5 covers about 75% of the bottom wall of the biological tank 1. The coverage area is a certain width of annular zone between the two annular air supply pipes 52 and on both its inner and outer sides.

[0191] Fish pond 2 is connected to the inlet of microparticle generator 3 via a 25mm inner diameter polypropylene water supply pipe. The pipe opening extends into fish pond 2 approximately 8cm above the bottom of the pond. Microparticle generator 3 is connected to biological treatment tank 1 via a 25mm inner diameter polypropylene water supply pipe. The water supply pipe opening extends into biological treatment tank 1 above the oxidation section 11, near the water surface.

[0192] A PVC drain pipe 6 with an inner diameter of 32 mm is installed at the bottom of the biological treatment tank 1. The pipe opening passes through the bottom wall panel of the biological treatment tank 1 and is located slightly off-center from the center of the bottom wall of the biological treatment tank 1. It is distributed at intervals with the annular air supply pipe 52 of the oxygen supply component 5. A PVC drain pipe 6 with an inner diameter of 25 mm is installed inside the microparticle generator 3. The pipe opening is located at the bottom of the microparticle generator 3's sludge collection tank.

[0193] The dirty outlets of the two sewage pipes 6 are both connected to the sludge collection and sedimentation tank next to the breeding area. A small submersible sewage pump with a power of 120W is also installed outside the biological tank 1. The sewage pump is connected to the sewage pipe 6 at the bottom of the biological tank 1 through a pipeline to provide power during sewage discharge.

[0194] Embodiment 2 of this application discloses a medium-sized recirculating aquaculture system for edible fish suitable for rural courtyards or fields.

[0195] The biological tank 1 of this system is a cylindrical barrel shape with an inner diameter of 120cm and a total height of 120cm. The water level is 108cm, accounting for 90% of the total height. Biological tank 1 has a 1.2mm thick galvanized sheet as its outer frame, lined with a 0.7mm thick polyester fiber coated canvas as a waterproof layer. The canvas is secured to the inner wall of the galvanized sheet using stainless steel rivets and EPDM rubber sealing strips. The galvanized sheet panels of the outer shell of biological tank 1 are assembled and connected by stainless steel bolts and rubber gaskets.

[0196] The water in the biological treatment tank 1 is divided into three sections from top to bottom along the direction of gravity: oxidation section 11, water supply section 12, and oxygen supply and sewage discharge section 13. The height of each of the three sections is approximately 36 cm. Oxidation section 11 is filled with floating MBBR suspended packing material. The packing material is made of cylindrical polypropylene with a monomer diameter of 20 mm, and the filling amount is 25% of the effective volume of oxidation section 11.

[0197] Fish pond 2 is a square pond with brick walls and cement plaster, with internal dimensions of 150cm × 150cm and a water level of 60cm. Fish pond 2 is stocked with bass at a density of approximately one bass with a body length of about 15cm per liter of water.

[0198] The microparticle filter 3 uses a small disc filter with a filtration accuracy of 120 mesh and a processing flow rate of 500 liters per hour.

[0199] Biological tank 1 and fish tank 2 are connected by a polypropylene siphon pipe 4 with an inner diameter of 32mm. The siphon pipe 4 overlaps the top edge of the two tanks, with the pipe opening extending into biological tank 1 located in the middle of the water supply section 12, and the pipe opening extending into fish tank 2 suspended about 8cm above the water surface. The water level in biological tank 1 is about 48cm higher than the water level in fish tank 2.

[0200] A circular polypropylene baffle plate 8 is installed inside the biological treatment tank 1. The baffle plate 8 has a diameter of 100 mm and a thickness of 3 mm, and is fixed to the bottom wall of the biological treatment tank 1 by two polypropylene pillars. The distance between the upper surface of the baffle plate 8 and the lower edge of the siphon pipe 4 opening is 15 mm, which is less than the radius of the siphon pipe 4 of 16 mm.

[0201] The oxygen supply assembly 5 includes a 120W vortex air pump, three annular PVC air supply pipes 52, eight PVC connecting pipes 53, and one PVC air supply pipe 54. The three air supply pipes 52 are an inner ring air supply pipe 52, a middle ring air supply pipe 52, and an outer ring air supply pipe 52, with annular diameters of 200mm, 500mm, and 800mm respectively, and an outer diameter of 25mm for each pipe. The three air supply pipes 52 are coaxially arranged. Four connecting pipes 53 are installed between each adjacent air supply pipe 52, and the connecting pipes 53 are evenly spaced at 90° intervals along the circumference. The air supply pipe 54 has an outer diameter of 32mm, penetrates the wall panel of the biological treatment tank 1, and is sealed by a flange and gasket. The air outlet 55 on the air supply pipe 52 has a diameter of 6mm, and the spacing between adjacent air outlets 55 is 40mm. The oxygen supply assembly 5 covers approximately 80% of the bottom wall area of ​​the biological treatment tank 1.

[0202] A 40mm inner diameter PVC drain pipe 6 is installed at the bottom of the biological treatment tank 1, with the pipe opening located on one side of the bottom wall of the biological treatment tank 1, and a horizontal distance of 15cm from the outer edge of the nearest air supply pipe 52. A 32mm inner diameter PVC drain pipe 6 is installed inside the microparticle generator 3. The dirty outlets of both drain pipes 6 are connected to the sludge collection and sedimentation tank next to the farm.

[0203] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0204] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An aquaculture system, characterized in that, The system includes a biological treatment tank, a fish pond, and a microparticle generator. The biological treatment tank and the fish pond are connected by a siphon pipe, so that the biological treatment tank supplies water to the fish pond through the siphon principle. The fish pond is connected to the microparticle generator through a water supply pipe, so that the wastewater in the fish pond is transported to the microparticle generator. After the microparticle generator treats the wastewater, it transports the water to the biological treatment tank through the water supply pipe. It also includes an oxygen supply component and two sewage pipes. The oxygen supply component is installed on the bottom wall of the biological tank and covers 65% to 85% of the bottom wall of the biological tank to supply oxygen to the water in the biological tank, and uses artificial filler to decompose ammonia nitrogen and nitrite in the biological tank. One of the drain pipes has its opening penetrating the bottom wall of the biological tank to connect the biological tank. The drain pipe is distributed at intervals relative to the oxygen supply component. The opening of the other drain pipe is located inside the microparticle generator to discharge the dirt inside the microparticle generator. The dirt outlets of both drain pipes are located in the area used for draining. The water level in the biochemical tank is higher than the water level in the fish tank. The water level in the biochemical tank is 80% to 95% of the total height of the biochemical tank. The water in the biochemical tank is divided into an oxidation section, a water supply section, and an oxygen supply and sewage discharge section from top to bottom along the direction of gravity. The oxidation section, water supply section, and oxygen supply and sewage discharge section are at the same or similar heights. The siphon pipe is located at the water supply section, and the oxygen supply component and the sewage discharge component are located at the oxygen supply and sewage discharge section, so that the oxygen supply, oxidation, water supply, and sewage discharge of the biochemical tank can operate independently and in a coordinated manner.

2. The aquaculture system according to claim 1, characterized in that, The artificial packing material is MBBR suspended packing material, which floats or is suspended in the oxidation part of the water in the biological treatment tank.

3. The aquaculture system according to claim 1, characterized in that, The two openings of the siphon extend into the biological treatment tank and the fish tank, respectively, and the siphon overlaps the top edge of the biological treatment tank and the fish tank.

4. The aquaculture system according to claim 3, characterized in that, The siphon pipe is located inside the fish pond and its opening is suspended above the water in the fish pond.

5. The aquaculture system according to claim 3, characterized in that, The aquaculture system also includes an air baffle plate, which is installed in the biological tank. The air baffle plate is fixedly installed relative to the biological tank and is located below the siphon pipe opening in the biological tank. The water inlet area of ​​the siphon pipe opening is completely projected onto the air baffle plate along the direction of gravity.

6. The aquaculture system according to claim 5, characterized in that, The distance between the baffle plate and the siphon tube is less than or equal to the radius of the siphon tube.

7. The aquaculture system according to any one of claims 1 to 6, characterized in that, The oxygen supply assembly includes an oxygenation pump, an annular make-up air pipe, a connecting pipe, and an air supply pipe. The gas supply pipe is configured as at least two, the diameters of the at least two gas supply pipes are different and independent of each other, the at least two gas supply pipes are coaxially arranged, at least three connecting pipes are arranged between two adjacent gas supply pipes, the connecting pipes connect the two adjacent gas supply pipes, all the connecting pipes are independent of each other, the gas supply pipe connects to the outermost gas supply pipe and passes through the biochemical tank body and extends to the outside of the biochemical tank body, the outer wall of the gas supply pipe is sealed to the biochemical tank body; The oxygenation pump is located outside the biological treatment tank, and the outlet of the oxygenation pump is connected to the air supply pipe. The portion of the gas supply pipe facing the top of the biochemical tank is provided with multiple air outlets, which are distributed circumferentially around the gas supply pipe, and the diameter of the air outlets is 2mm to 10mm.

8. The aquaculture system according to claim 1, characterized in that, The aquaculture system also includes a sewage pump, which is located outside the biological treatment tank and is used to provide power to the sewage pipe on the biological treatment tank.

9. The aquaculture system according to claim 1, characterized in that, The biochemical chamber is in the shape of a cylindrical barrel and is composed of galvanized steel sheet and canvas.

10. The aquaculture system according to claim 1, characterized in that, The sewage discharged through the drain pipe includes, but is not limited to, feces and uneaten feed sediment.

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