Zero-discharge biological ecological system for circulating water

Abstract

The utility model provides a circulating water zero-discharge biological ecological system, which relates to the technical field of aquaculture wastewater treatment, and the whole process is divided into three key links: firstly, organic nitrogen is decomposed by bacteria and converted into nitrate nitrogen; secondly, further converting nitrate nitrogen into nitrate by nitrifying bacteria; and finally, converting the nitrate into plant fibers by the plant. Through cooperative work of the three links, the problem that organic matter pollutes a water body is thoroughly solved, the purpose of zero water change in the whole breeding process is achieved, and meanwhile the system operates at the speed of circulation once per hour, which is equivalent to continuously providing a fresh water source for breeding animals. The water body is free of impurities, floating objects, ammonia nitrogen and nitrite, and high-density cultivation is truly achieved. Meanwhile, the system fully utilizes the characteristic of water level difference, only needs to lift water into the fermentation barrel once, and runs in a self-flowing mode without energy consumption in the whole process, so that the energy consumption is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture wastewater treatment technology, and in particular to a circulating water zero-discharge biological ecosystem. Background Technology

[0002] In traditional aquaculture, the accumulation of organic matter such as fish feces and uneaten feed leads to water quality deterioration, affecting the healthy growth of farmed organisms. Existing treatment technologies mostly rely on chemical or physical methods, which are not only costly but may also introduce secondary pollution. Utility Model Content

[0003] The purpose of this invention is to provide a zero-discharge biological ecosystem for circulating water, thereby addressing the technical problems of existing water treatment methods that typically rely on chemical or physical methods, leading to high costs and potential secondary pollution. The preferred technical solutions among the various technical solutions provided by this invention and their numerous technical effects are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This utility model provides a zero-discharge circulating water biological ecosystem, including an aquaculture tank, a fermentation tank, and a nitrifying bacteria culture tank. The nitrifying bacteria culture tank and the aquaculture tank are connected by a first conveying pipe, with the water level in the nitrifying bacteria culture tank higher than the water level in the aquaculture tank, so that water from the nitrifying bacteria culture tank is automatically conveyed to the aquaculture tank via the first conveying pipe. The fermentation tank contains multiple filter bags, each with a first inlet at the top and a first outlet at the bottom. The aquaculture tank contains water... A pump is used to transport water from the aquaculture pond to a filter bag via a second conveying pipe. After digestion and fine treatment, the water flows into the fermentation tank. The filter bag is lined with cotton material to form a bacterial breeding chamber. The fermentation tank is equipped with a first inlet pipe. The second inlet of the first inlet pipe is higher than the top of the nitrifying bacteria culture pond. The second outlet of the first inlet pipe is located at the bottom of the fermentation tank and connected to the nitrifying bacteria culture pond. A planting float is installed at the top of the nitrifying bacteria culture pond for planting vegetation.

[0006] Preferably, the lower end of the water pump is provided with a pump-type oxygen cone and an ejector in sequence. The ejector is used to connect with external oxygen and deliver the generated oxygen to the second delivery pipe. The pump-type oxygen cone mixes the oxygen into the water.

[0007] Preferably, the top of the fermentation tank is provided with an annular diversion device, the second outlet of the second conveying pipe is connected to the diversion device, the bottom of the diversion device is provided with multiple diversion outlets, and the top of the filter bag is connected to the diversion outlets.

[0008] Preferably, the bottom of the nitrifying bacteria culture tank is provided with an outlet pipe, a third outlet is provided on the side wall of the outlet pipe, and the end of the outlet pipe away from the first inlet pipe is set as a blind end.

[0009] Preferably, the top of the fermentation tank is 48-52 cm higher than the top of the nitrifying bacteria culture tank, and the second water inlet is 8-22 cm higher than the top of the nitrifying bacteria culture tank; the first water inlet of the first conveying pipe is 8-22 cm higher than the top of the culture tank.

[0010] Preferably, the nitrifying bacteria culture tank is provided with nitrifying bacteria biofilm filter media.

[0011] Preferably, the first outlet of the first delivery pipe is inclined so that the water forms a vortex in the aquaculture pond.

[0012] Preferably, when the filter bags are arranged in a string, two adjacent filter bags are connected by a connecting pipe.

[0013] The technical solution provided in this application document has the following beneficial effects:

[0014] This invention provides a circulating water zero-discharge biological ecosystem, including a breeding pond, a fermentation tank, and a nitrifying bacteria culture pond placed on the ground. The nitrifying bacteria culture pond and the breeding pond are connected by a first conveying pipe, and the water level in the nitrifying bacteria culture pond is higher than the water level in the breeding pond. The water pressure in the nitrifying bacteria culture pond is higher than the water pressure in the breeding pond, thereby enabling the water in the nitrifying bacteria culture pond to be automatically conveyed to the breeding pond through the first conveying pipe to achieve water flow. The water in the nitrifying bacteria culture pond is purified water to provide for the fish in the breeding pond to survive. Multiple filter bags are evenly distributed on the inner circumference of the fermentation tank. Each filter bag has a first inlet at the top and a first outlet at the bottom. The filter bags are lined with cotton material to form a bacterial breeding chamber, providing an ideal environment for bacterial growth. A water pump in the aquaculture tank pumps water from the aquaculture tank to the filter bags via a second delivery pipe. After treatment by bacteria in the bacterial breeding chamber, the water flows into the fermentation tank. The fermentation tank has a first inlet pipe with a second inlet higher than the top of the nitrifying bacteria culture tank. The second outlet of the first inlet pipe connects to the bottom of the fermentation tank and the nitrifying bacteria culture tank. A planting float is installed at the top of the nitrifying bacteria culture tank for planting aquatic plants. The water flow continues to push nitrate-containing water to the area below the planting float, where the plant roots quickly absorb the nitrates and convert them into nutrients. This plant filtration process perfectly solves the final link in the nitrogen cycle. This closed-loop system operates at a rate of once per hour, continuously providing fresh water to the farmed animals. This ensures the water is free of impurities, floating debris, ammonia nitrogen, and nitrite, truly enabling high-density aquaculture. Furthermore, the system fully utilizes water level differences, requiring only one water pumping into the fermentation tank, operating entirely in a gravity-flow mode with zero energy consumption, significantly reducing energy costs. In addition, since there is no mechanical filtration equipment, a single water pump can handle the circulation and filtration, further reducing equipment maintenance costs. Overall, the system's energy consumption is only one-third of current recirculating aquaculture systems. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a zero-discharge biological ecosystem for circulating water provided in Embodiment 1 of this utility model.

[0017] Figure 2 This is a schematic diagram illustrating the structure of a separation device according to an exemplary embodiment.

[0018] In the diagram: 1. Aquaculture tank; 11. Water pump; 12. Pump-type oxygen cone; 13. Jet ejector; 2. Fermentation tank; 21. Diversion device; 211. Diversion outlet; 22. Filter bag; 221. First inlet; 222. First outlet; 223. Bacterial breeding house; 23. First inlet pipe; 231. Second inlet; 3. Bacterial culture tank; 31. Bacterial biofilm filter media; 32. Outlet pipe; 33. Planting float; 4. First delivery pipe; 41. First pipe outlet; 5. Second delivery pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] This specific embodiment provides a zero-discharge biological ecosystem for circulating water, which solves the technical problems of existing water treatment methods that usually rely on chemical or physical methods, resulting in high costs and the potential introduction of secondary pollution.

[0021] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the following embodiments are not limited to those necessary for the solution of the utility model as described in the claims.

[0022] Reference Figures 1-2 This utility model provides a circulating water zero-discharge biological ecosystem, including an aquaculture pond 1, a fermentation tank 2, and a nitrifying bacteria culture pond 3 located on the ground. The nitrifying bacteria culture pond 3 and the aquaculture pond 1 are connected by a first conveying pipe 4, and the water level in the nitrifying bacteria culture pond 3 is higher than the water level in the aquaculture pond 1. Thus, at the same horizontal level, the water pressure in the nitrifying bacteria culture pond 3 is higher than the water pressure in the aquaculture pond 1, thereby enabling the water in the nitrifying bacteria culture pond 3 to be automatically conveyed to the aquaculture pond 1 through the first conveying pipe 4 to achieve water flow. The water in the nitrifying bacteria culture pond 3 is purified water to provide for the fish in the aquaculture pond to survive.

[0023] To facilitate the purification of water in the aquaculture pond 1, multiple filter bags 22 are installed in the fermentation tank 2. The filter bags 22 are evenly distributed on the inner circumference of the fermentation tank 2. The top of the filter bag 22 is provided with a first water inlet 221 and the bottom with a first water outlet 222. The filter bags 22 are lined with cotton material to form a bacterial breeding chamber 223, providing an ideal breeding environment for bacteria. A water pump 11 is installed in the aquaculture pond 1. The water pump 11 transports water from the aquaculture pond 1 to the filter bags 22 through the second delivery pipe 5. After being treated by bacteria in the bacterial breeding chamber 223, the water flows into the fermentation tank 2. When the water pump delivers organic matter, bacterial inoculum, and highly oxygenated water into the filter bags 22, the bacteria, being aerobic beneficial bacteria, are trapped and gradually accumulate inside the filter bags. At the same time, because the filter bags provide sufficient oxygen, residual protein from fish feces, and carbon sources in the water, the bacteria have sufficient energy to multiply rapidly and actively decompose organic matter. This process continuously converts organic matter into inorganic salts, thus completing the first step of the system's treatment process. The conversion of organic matter in water into inorganic salts is nitrite.

[0024] The fermentation tank 2 is equipped with a first inlet pipe 23. The second inlet 231 of the first inlet pipe 23 is higher than the top of the nitrifying bacteria culture tank 3. The second outlet of the first inlet pipe 23 is located at the bottom of the fermentation tank 2 and connected to the nitrifying bacteria culture tank 3. A planting float 33 is installed at the top of the nitrifying bacteria culture tank 3. The planting float 33 is used to grow vegetation. Because the water effluent from the fermentation tank 2 is rich in nitrite, the carbon source food required by nitrifying bacteria, these bacteria attach to the filter media and enjoy a continuous food supply. At the same time, the high dissolved oxygen environment in the water meets all the conditions for the survival and reproduction of nitrifying bacteria, which greatly improves their working efficiency and converts toxic nitrite into non-toxic nitrate. At the upper water surface of the nitrifying bacteria culture tank 3, the planting float 33 is used to grow aquatic plants. The water flow continues to push the nitrate-containing water to the area below the planting float, where the plant roots quickly absorb these nitrates and convert them into their own nutrients. The addition of this plant filtration link perfectly solves the last link in the nitrogen cycle.

[0025] This setup divides the entire process into three key stages: First, bacteria decompose organic nitrogen into nitrate nitrogen; second, nitrifying bacteria further convert nitrate nitrogen into nitrate; and finally, plants convert nitrate into plant fiber. The coordinated work of these three stages completely solves the problem of organic pollution in the water, achieving the goal of zero water changes throughout the entire aquaculture process. Simultaneously, the system operates at a rate of once per hour, effectively providing a continuous supply of fresh water to the farmed animals. This ensures the water is free of impurities, floating matter, ammonia nitrogen, and nitrite, truly enabling high-density aquaculture. Furthermore, the system fully utilizes the water level difference, requiring only one water pump to enter the fermentation tank, operating in a gravity-flow mode with zero energy consumption throughout, significantly saving energy. In addition, since there is no mechanical filtration equipment, only one water pump is needed to complete the circulation and filtration task, significantly reducing equipment maintenance costs. Overall, the energy consumption of this system is only one-third of that of current recirculating aquaculture systems.

[0026] To further optimize the solution and increase the oxygen content in the water, accelerate bacterial decomposition, and improve treatment efficiency, a pump-type oxygen cone 12 and an ejector 13 are sequentially installed at the lower end of the water pump 11. The ejector 13 is used to connect to an external oxygen supply system, delivering the generated oxygen to the second delivery pipe 5. The pump-type oxygen cone 12 mixes the oxygen into the water. The suction force of the water pump 11 is cleverly used as a power source to drive the water flow through the ejector. The ejector generates a negative pressure effect as the water flows through, thereby mixing pure oxygen into the water through a connection to pure oxygen, liquid oxygen, or pure oxygen produced by an oxygen generator. Then, after further cutting and mixing by the pump-type oxygen cone 12, the oxygen content in the water is significantly increased, forming oxygen-enriched water.

[0027] To further optimize the solution, in order to distribute water into each filter bag 22, an annular diversion device 21 is provided at the top of the fermentation tank 2. The second outlet of the second conveying pipe 5 is connected to the diversion device 21. Multiple diversion outlets 211 are provided at the bottom of the diversion device 21. The top of the filter bag 22 is connected to the diversion outlets 211, thereby transporting the water in the breeding pond 1 into the filter bag 22 for decomposition within the filter bag 22.

[0028] To further optimize the design, a water outlet pipe 32 is installed at the bottom of the nitrifying bacteria culture tank 3. A third water outlet is installed on the side wall of the water outlet pipe 32, and the end of the water outlet pipe 32 away from the first water inlet pipe 23 is set as a blind end. The third water outlet on the side wall of the water outlet pipe 32 can evenly distribute water at the bottom of the nitrifying bacteria culture tank 3, so that water can naturally overflow upward from the small holes in the pipe network by utilizing the water level difference.

[0029] Further optimization of the scheme: the top of the fermentation tank 2 is 48-52 cm higher than the top of the nitrifying bacteria culture tank 3, and the second inlet 231 is 18-22 cm higher than the top of the nitrifying bacteria culture tank 3; the first inlet of the first delivery pipe is 18-22 cm higher than the top of the aquaculture tank 1.

[0030] To further optimize the system and facilitate the reproduction of nitrifying bacteria, a nitrifying bacteria biofilm filter media 31 is installed in the nitrifying bacteria cultivation tank 3. Since the effluent from the fermentation tank is rich in nitrite, the carbon source and food source required by nitrifying bacteria, these bacteria attach to the biofilm filter media 31, enjoying a continuous food supply. Simultaneously, the high dissolved oxygen environment in the water meets all the conditions for the survival and reproduction of nitrifying bacteria, significantly improving their efficiency and converting toxic nitrite into non-toxic nitrate. Water flows upwards across the surface of the biofilm filter media 31, providing the nitrifying bacteria with the necessary nutrients for conversion. To ensure that the water flow rate is not affected by the type of nitrifying bacteria biofilm filter media 31, the range of usable materials has been greatly expanded. Any water-insoluble substance in the system, such as widely available pebbles or small stones, can be used as an effective filter media. This adjustment not only facilitates the use of locally sourced materials and reduces costs, but also, in practice, has proven to have a particularly significant filtration effect.

[0031] Further optimizing the design, the first outlet 41 of the first delivery pipe 4 is inclined to create a vortex in the aquaculture pond 1. In high-density, factory-style aquaculture ponds, due to the inclined outlet, the water rotates and generates centrifugal force under the action of the water flow. This force field effectively gathers fish feces, uneaten feed, and other organic matter to the central area of ​​the pond. Simultaneously, the water pump located in this area plays a crucial role, not only removing this organic matter but also absorbing the bacteria such as Bacillus, Lactic Acid Bacteria, and Yeast that are periodically added to the water to decompose organic matter, as well as the carbon source needed for these bacteria. Furthermore, the bottom of the aquaculture pond 1 is designed in a conical shape to facilitate the collection of feces.

[0032] In a further optimized design, when the filter bags 22 are arranged in a string, the two adjacent filter bags 22 are connected by a connecting pipe. That is, the first outlet on the first filter bag 22 is connected to the first inlet on the next filter bag 22, and so on. The outlet of the bottom filter bag 22 can be provided with a cotton material forming a bacterial breeding house 223. The filter bag 22 is set in a cone shape, with the largest diameter being 18-22 cm and the height being 80-100 cm.

[0033] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., used herein to indicate the orientation or positional relationship shown in the accompanying drawings, are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In this description, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

[0036] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be referred to the same or similar content in other embodiments. The multiple solutions provided in this application contain their own basic solutions, are independent of each other, and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects.

[0037] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A zero-discharge biological ecosystem for circulating water, characterized in that, The system includes a breeding pond (1), a fermentation tank (2), and a nitrifying bacteria culture tank (3). The nitrifying bacteria culture tank (3) and the breeding pond (1) are connected by a first conveying pipe (4), and the water level in the nitrifying bacteria culture tank (3) is higher than the water level in the breeding pond (1), so that water from the nitrifying bacteria culture tank (3) is automatically conveyed to the breeding pond (1) via the first conveying pipe (4). The fermentation tank (2) is equipped with multiple filter bags (22), each with a first inlet (221) at the top and a first outlet (222) at the bottom. The breeding pond (1) is equipped with a water pump (11), which pumps water from the breeding pond to the culture tank. Water in the breeding tank (1) is transported to the filter bag (22) through the second conveying pipe (5), and after digestion and fine treatment, it flows into the fermentation tank (2). The filter bag (22) is equipped with cotton material to form a bacterial breeding house (223). The fermentation tank (2) is equipped with a first water inlet pipe (23). The second water inlet (231) of the first water inlet pipe (23) is higher than the top of the nitrifying bacteria culture tank (3). The second water outlet of the first water inlet pipe (23) is connected to the bottom of the fermentation tank (2) and the nitrifying bacteria culture tank (3). The top of the nitrifying bacteria culture tank (3) is equipped with a planting float (33), which is used to plant vegetation.

2. The zero-discharge biological ecosystem for circulating water according to claim 1, characterized in that, The lower end of the water pump (11) is provided with a pump-type oxygen cone (12) and an ejector (13) in sequence. The ejector (13) is used to connect with external oxygen and deliver the generated oxygen to the second delivery pipe (5). The pump-type oxygen cone (12) mixes the oxygen into the water.

3. The zero-discharge biological ecosystem for circulating water according to claim 1, characterized in that, The fermentation tank (2) is provided with an annular diversion device (21) at the top. The second outlet of the second conveying pipe (5) is connected to the diversion device (21). The bottom of the diversion device (21) is provided with multiple diversion outlets (211). The top of the filter bag (22) is connected to the diversion outlets (211).

4. The zero-discharge biological ecosystem for circulating water according to claim 1, characterized in that, The bottom of the nitrifying bacteria culture tank (3) is provided with an outlet pipe (32), and a third outlet is provided on the side wall of the outlet pipe (32). The end of the outlet pipe (32) away from the first inlet pipe (23) is set as a blind end.

5. The zero-discharge biological ecosystem for circulating water according to claim 1, characterized in that, The top of the fermentation tank (2) is 48-52 cm higher than the top of the nitrifying bacteria culture tank (3), and the second inlet (231) is 18-22 cm higher than the top of the nitrifying bacteria culture tank (3); the first inlet of the first conveying pipe is 18-22 cm higher than the top of the aquaculture tank (1).

6. The zero-discharge biological ecosystem for circulating water according to claim 1, characterized in that, The nitrifying bacteria culture tank (3) is equipped with nitrifying bacteria biofilm filter media (31).

7. The zero-discharge biological ecosystem for circulating water according to claim 1, characterized in that, The first outlet (41) of the first delivery pipe (4) is inclined so that the water forms a vortex in the aquaculture pond (1).

8. The zero-discharge biological ecosystem for circulating water according to claim 1, characterized in that, When the filter bags (22) are arranged in a string, two adjacent filter bags (22) are connected by a connecting pipe.

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