Fish, mushroom and vegetable symbiotic system

Abstract

The utility model discloses a fish, mushroom and vegetable symbiotic system, including fishpond, soilless culture box and microbiological treatment component, the bottom of fishpond is provided with waste water discharge port, microbiological treatment component includes aerobic treatment unit and anoxic treatment unit, aerobic treatment unit includes aerobic treatment box, the liquid inlet of aerobic treatment box is communicated with waste water discharge port, and the liquid outlet of aerobic treatment box is communicated with anoxic treatment unit. When the wastewater is discharged into the aerobic treatment box, nitrifying bacteria in an aerobic state convert ammonia nitrogen into nitrate which can be absorbed by plants, and phosphorus-accumulating bacteria uptake phosphorus-containing pollutants in the wastewater and form flocculent sludge; the anoxic treatment unit comprises an anoxic treatment box, a liquid inlet in the anoxic treatment box is communicated with a liquid outlet in the aerobic treatment unit through a first connecting pipe, a filter plate is further arranged in the anoxic treatment unit, after flocculent sludge enters the anoxic treatment box, phosphorus-accumulating bacteria release inorganic phosphate which can be absorbed by plants in an anaerobic state, and the flocculent sludge enters the aerobic treatment box; nitrate and inorganic phosphate penetrate through the filter plate and then enter the soilless culture box.

Description

Technical Field

[0001] This utility model belongs to the field of ecological symbiosis system technology, specifically relating to a fish-fungus-vegetable symbiosis system. Background Technology

[0002] Aquaponics is an agricultural model that integrates aquaculture and hydroponics. It utilizes fish excrement to provide nutrients for plants, while the plants' growth also filters the water, thus achieving efficient resource utilization and ecological balance.

[0003] Traditional aquaponics systems mainly consist of a fishpond, plant cultivation units, a water pump, and pipes. The pipes connect the fishpond and the plant cultivation units, and the water pump draws water from the fishpond to the plant cultivation units. In this system, wastewater from the fishpond is used as a nutrient source for the plants, while the plants help purify the water and create a favorable living environment for the fish.

[0004] The wastewater produced by fish contains ammonia nitrogen and phosphorus pollutants that cannot be consumed by plants. Ammonia nitrogen is toxic to plants and can affect their growth and development. Phosphorus pollutants (phosphates and organic phosphorus compounds) in the wastewater cannot be directly absorbed by plants. When fish are farmed on a large scale, the ammonia nitrogen and phosphorus pollutants that are not consumed by plants will have an adverse effect on the normal cycle of the entire system. Utility Model Content

[0005] The purpose of this invention is to provide a fish-mushroom-vegetable symbiotic system, which is a stable and efficient cyclical fish-mushroom-vegetable symbiotic system.

[0006] The technical solution adopted in this utility model is a fish-mushroom-vegetable symbiotic system, including a fish pond and a hydroponics box. The bottom of the fish pond is equipped with a wastewater discharge outlet. The wastewater discharged from the outlet contains nitrifying bacteria and polyphosphate-accumulating bacteria. The system also includes a microbial treatment component, which comprises:

[0007] The aerobic treatment unit includes an aerobic treatment tank. The inlet of the aerobic treatment tank is connected to the wastewater discharge outlet. When the wastewater is discharged into the aerobic treatment tank, nitrifying bacteria convert ammonia nitrogen into nitrates that can be absorbed by plants under aerobic conditions. Polyphosphate-accumulating bacteria take up phosphorus-containing pollutants in the wastewater and form flocculent sludge.

[0008] The anoxic treatment unit includes an anoxic treatment box. The inlet of the anoxic treatment box is connected to the outlet of the aerobic treatment unit through a first connecting pipe. The first connecting pipe is located between the bottom of the aerobic treatment unit and the anoxic treatment unit. The anoxic treatment unit is also equipped with a filter plate. The outlet on the upper side of the anoxic treatment box is connected to the soilless cultivation box. After the flocculent sludge enters the anoxic treatment box, polyphosphate-accumulating bacteria release inorganic phosphates that can be absorbed by plants under anaerobic conditions. Then, nitrates and inorganic phosphates pass through the filter plate and enter the soilless cultivation box. The flocculent sludge settles to the lower side of the filter plate.

[0009] The filter plates installed inside the anoxic treatment unit are stepped filter plates, and there are multiple stepped filter plates arranged in sequence along the vertical direction.

[0010] A sludge return pipeline is installed between the bottom of the aerobic treatment unit and the anoxic treatment unit. A return pump is installed on the sludge return pipeline, and a sludge discharge port is also installed on the sludge return pipeline.

[0011] A wetland unit is also installed between the wastewater discharge outlet and the aerobic treatment unit. The inlet of the wetland unit is connected to the wastewater discharge outlet through a second connecting pipe, and the outlet of the wetland unit is connected to the inlet of the aerobic treatment unit through a third connecting pipe.

[0012] The wetland unit also includes a sponge filter layer, a porous volcanic rock filter layer, and a soil layer from bottom to top.

[0013] A membrane filtration unit is also installed between the drain outlet of the anoxic treatment unit and the hydroponics box. The membrane filtration unit includes a filter box and a filter membrane assembly. The filter membrane assembly is vertically installed in the filter box and divides the filter box into a waste liquid chamber that communicates with the anoxic treatment unit and a clean liquid chamber that communicates with the hydroponics box.

[0014] The inlet of the aerobic treatment unit is lower than the outlet of the wetland unit.

[0015] The inlet of the wastewater chamber is lower than the outlet of the anoxic treatment unit.

[0016] The bottom of the fishpond is equipped with a funnel-shaped waste storage chamber. The cross-sectional shape of the waste storage chamber in the vertical plane is a right triangle. The bottom tip of the waste storage chamber is close to the side wall of the fishpond. The inlet of the second connecting pipe is connected to the bottom tip of the waste storage chamber.

[0017] An aeration pipe is installed at the bottom of the aerobic treatment box, and an aeration pump is installed on the aeration pipe.

[0018] The beneficial effects of this utility model are:

[0019] This utility model discloses a fish-bacteria-vegetable symbiotic system. Wastewater from a fishpond enters an aerobic treatment tank. Under aerobic conditions, nitrifying bacteria in the wastewater convert ammonia nitrogen into nitrates that plants can absorb. Polyphosphate-accumulating bacteria in the wastewater, under aerobic conditions, can absorb excessive amounts of phosphorus from the wastewater, resulting in phosphorus levels several times higher than those of ordinary bacteria. During this process, the wastewater is mixed in the aerobic treatment tank, forming flocculent sludge. The flocculent sludge from the aerobic treatment unit then enters an anoxic treatment tank. Under anaerobic conditions, polyphosphate-accumulating bacteria release inorganic phosphates (PO4) that can be absorbed by plants, while also containing... The sludge from a large amount of polyphosphate-accumulating bacteria settles in the lower layer under the action of filtration and gravity, awaiting further treatment. Nitrates and inorganic phosphates that can be absorbed by plants pass through the filter plate and finally enter the soilless cultivation box. Therefore, this invention can convert ammonia nitrogen and phosphorus-containing pollutants in wastewater into nitrates and inorganic phosphates that can be directly absorbed by plants through aerobic and anoxic treatment units, respectively. Thus, this invention, through its microbial treatment components, can effectively solve the problem that plants in existing aquaponics systems cannot directly consume ammonia nitrogen and some phosphorus-containing pollutants, thereby achieving the effect of water recycling. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a fish-mushroom-vegetable symbiotic system according to this utility model;

[0021] Figure 2 This is a physical diagram of a microbial treatment component in a fish-mushroom-vegetable symbiotic system according to this utility model;

[0022] Figure 3 This is a schematic diagram of the interface of the anoxic treatment unit in a fish-mushroom-vegetable symbiotic system according to this utility model.

[0023] In the diagram, 1 is a fish pond; 2 is a hydroponics box; 3 is a wetland unit; 4 is an aerobic treatment unit; 5 is an anoxic treatment unit; 6 is a membrane filtration unit; 7 is a filter box; 8 is a filter membrane assembly; 9 is a sludge return pipeline; 10 is a level gauge; and 11 is a waste storage chamber. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and should not be construed as limiting the protection scheme of the present invention.

[0025] Aquaponics is an agricultural model that integrates aquaculture and hydroponics. It utilizes fish excrement to provide nutrients for plants, while the plants' growth also filters the water, thus achieving efficient resource utilization and ecological balance.

[0026] Traditional aquaponics systems mainly consist of a water body unit, a plant cultivation unit, a water pump, and pipes. The pipes connect the water body unit and the plant cultivation unit, and the water pump is used to pump water from the fishpond to the plant cultivation unit. In this system, wastewater produced by the fish is used as a nutrient source for the plants, while the plants help purify the water and create a favorable living environment for the fish.

[0027] Wastewater from fish farming contains organic matter and nitrogen and phosphorus pollutants. Nitrogen and phosphorus are usually in organic forms, and these organic forms of nitrogen (such as urea and amino acids) and phosphorus (such as phosphates and organophosphorus compounds) cannot necessarily be directly absorbed by plants. Therefore, when fish are farmed in large quantities, the nitrogen and phosphorus that are not consumed by plants will have an adverse effect on the normal cycle of the entire system.

[0028] This utility model discloses a fish-mushroom-vegetable symbiotic system, such as Figures 1-2 As shown, the system includes a fishpond 1 and a hydroponics box 2. The bottom of the fishpond 1 has a wastewater discharge outlet. The wastewater discharged from the outlet contains nitrifying bacteria and polyphosphate-accumulating bacteria. The wastewater discharge outlet is sequentially connected to a wetland unit 3, a microbial treatment component, and a membrane filtration unit. The microbial treatment component includes an aerobic treatment unit 4 and an anoxic treatment unit 5. The aerobic treatment unit 4 includes an aerobic treatment tank, whose inlet is connected to the wastewater discharge outlet. When wastewater is discharged into the aerobic treatment tank, under aerobic conditions, nitrifying bacteria convert ammonia nitrogen into nitrates that plants can absorb, while polyphosphate-accumulating bacteria absorb phosphorus-containing pollutants from the wastewater and form... The flocculated sludge is treated in an anaerobic treatment unit 5, which includes an anoxic treatment tank. The inlet of the anoxic treatment tank is connected to the outlet of the aerobic treatment unit 4 via a first connecting pipe, which is positioned between the bottoms of the aerobic treatment unit 4 and the anoxic treatment unit 5. A filter plate is also installed inside the anoxic treatment unit 5. The outlet on the upper side of the anoxic treatment tank is connected to the soilless cultivation box 2. After the flocculated sludge enters the anoxic treatment tank, polyphosphate-accumulating bacteria release inorganic phosphates that can be absorbed by plants under anaerobic conditions. Then, nitrates and inorganic phosphates pass through the filter plate and enter the soilless cultivation box 2, where the flocculated sludge settles to the underside of the filter plate. Therefore, the wastewater discharged from the fishpond 1 passes sequentially through the wetland treatment unit, aerobic treatment unit 4, anoxic treatment unit 5, and membrane treatment unit, which consumes ammonia nitrogen and phosphorus-containing pollutants in the wastewater.

[0029] Furthermore, in this embodiment, the filter plates within the anoxic treatment unit 5 are stepped filter plates. Multiple stepped filter plates are arranged vertically in sequence. The horizontal plates of each stepped filter plate have 0.2cm aperture holes. Therefore, the sludge-water entering the anoxic treatment unit 5 passes through the stepped filter plates, causing the wastewater to flow upwards from the bottom, while the sludge settles downwards under gravity. After passing through the first stepped filter plate, it settles again, and the same applies to the second stepped filter plate. The sludge remaining on the filter plates continues to settle downwards along the holes due to the force of the water flow, until it reaches the bottom of the anoxic treatment unit 5. The stepped filter plates enable multi-level filtration, with each layer capable of removing pollutants of different sizes and types, thus achieving a more comprehensive purification effect. The vertical arrangement of multiple stepped filter plates increases the capacity of the treatment system, as each layer can function as an independent treatment unit.

[0030] In the aerobic treatment unit 4, the aeration pump fills the aerobic treatment tank with air. The wastewater is in a mixed state in the aerobic treatment unit 4. Then, the mixed liquid enters the anoxic treatment unit 5 through the first connecting pipe. Then, the sludge in the outflowing mixed liquid settles down under the action of gravity. The settled sludge contains a large number of polyphosphate-accumulating bacteria. Finally, the settled sludge is replenished into the aerobic treatment unit 4 through the sludge return pipe 9. This ensures the stability of the concentration of nitrifying bacteria in the aerobic treatment unit 4. Under the action of nitrifying bacteria, ammonia nitrogen is converted into nitrate.

[0031] This utility model discloses a fish-bacteria-vegetable symbiotic system. Wastewater from a fishpond 1 enters an aerobic treatment tank. Under aerobic conditions, microorganisms convert nitrifying bacteria in the wastewater into nitrates that plants can absorb. Polyphosphate-accumulating bacteria in the wastewater, under aerobic conditions, can absorb excessive amounts of phosphorus from the wastewater, resulting in phosphorus levels several times higher than those of ordinary bacteria. During this process, the wastewater is mixed in the aerobic treatment tank, forming flocculent sludge. The sludge from the aerobic treatment unit 4 then enters an anoxic treatment tank. Under anaerobic conditions, polyphosphate-accumulating bacteria release inorganic phosphates (PO4) that can be absorbed by plants. Simultaneously, the sludge containing a large number of polyphosphate-accumulating bacteria is filtered by a stepped filter plate and... Under gravity, the sediment settles in the lower layer awaiting further treatment. Nitrates and inorganic phosphates that can be absorbed by plants pass through the upper layer of the filter plate and finally enter the soilless cultivation box 2. Therefore, this invention can convert ammonia nitrogen and phosphorus pollutants in wastewater into nitrates and inorganic phosphates that can be directly absorbed by plants through the aerobic treatment unit 4 and the anoxic treatment unit 5, respectively. By controlling the residence time and flow rate of wastewater in the aerobic treatment unit 4 and the anoxic treatment unit 5, the treatment effect can be adjusted. Therefore, the microbial treatment components set in this application can effectively solve the problem that plants in the existing aquaponics system cannot directly consume ammonia nitrogen and phosphorus pollutants, thus achieving the effect of water recycling.

[0032] Furthermore, in this embodiment, a sludge return pipeline 9 is provided between the bottom of the aerobic treatment unit 4 and the anoxic treatment unit 5. A return pump is installed on the sludge return pipeline 9, and a sludge discharge port is also provided on the sludge return pipeline. When too much sludge accumulates, the return pump on the sludge return pipeline 9 is turned on to suck the sludge back into the aerobic treatment unit, the purpose of which is to replenish the microorganisms in the aerobic treatment unit; and the sludge return pipeline 9 is also provided with a sludge discharge port, so that if a large amount of sludge settles, a portion of the sludge can be discharged through the sludge discharge port.

[0033] Furthermore, in this embodiment, a wetland unit 3 is also provided between the wastewater discharge outlet and the aerobic treatment unit 4. The inlet of the wetland unit 3 is connected to the wastewater discharge outlet at the bottom of the fish pond 1 via a second connecting pipe, and the outlet of the wetland unit 3 is connected to the inlet of the aerobic treatment unit 4 via a third connecting pipe. Specifically, the wetland unit 3 is further provided with a sponge filter layer, a porous volcanic rock filter layer, and a soil layer from bottom to top. The particle size of the porous volcanic rock filter layer gradually decreases from bottom to top, and the thickness of the soil layer is approximately 5 cm. Therefore, the wastewater discharged from the fishpond is organic wastewater containing nitrogen and phosphorus. This wastewater first passes through a wetland system. The lower layer of the wetland system is a sponge filter layer, preventing sand and gravel from entering with the water flow. Above the sponge is a porous volcanic rock filter layer with gradually decreasing particle size from bottom to top. Aquatic plants are planted in the uppermost soil layer. Through the synergistic treatment of physical filtration, aquatic plants, and microorganisms, the organic pollutants and nitrogen and phosphorus in the wastewater undergo the first stage of treatment in wetland unit 3. In particular, the sequential batch process is employed. When the wetland is full of water, it is considered an anaerobic system. After drainage, air enters the gaps, creating an aerobic environment. This alternating anaerobic and aerobic state makes it easier to treat nitrogen and phosphorus. Simultaneously, the wetland system also forms a landscape resource, effectively achieving carbon emission reduction.

[0034] Furthermore, in this embodiment, a membrane filtration unit 6 is also provided between the drain outlet of the anoxic treatment unit 5 and the hydroponics box 2. The membrane filtration unit 6 includes a filter box 7 and a filter membrane assembly 8. The filter membrane assembly 8 is vertically arranged inside the filter box 7, dividing the filter box 7 into a wastewater chamber communicating with the anoxic treatment unit 5 and a clean water chamber communicating with the hydroponics box 2. After the liquid from the anoxic treatment unit enters the membrane filtration unit 6, the membrane filtration unit 6 can further filter the treated water to remove suspended solids, allowing clean water to enter the hydroponics box.

[0035] Furthermore, a level gauge 10 is installed in the clean liquid chamber. When the water level reaches a certain value, the circulation system can be activated to transport the water in the clean liquid chamber to the hydroponics box 2.

[0036] Finally, the water filtered by membrane filtration unit 6 enters soilless cultivation tank 2, where it can effectively absorb nitrates and achieve denitrification. After purification, the water is then returned to the aquaculture system to provide oxygen for the fish.

[0037] like Figure 3As shown, to reduce overall costs and the use of water pumps, the inlet of the aerobic treatment unit 4 disclosed in this embodiment is lower than the outlet of the wetland unit 3. Therefore, the liquid discharged from the wetland unit 3 can directly enter the aerobic treatment unit 4. Similarly, the inlet of the sludge chamber is lower than the outlet of the anoxic treatment unit 5. The anoxic treatment unit 5 adopts a phase separation anoxic tank, and a filter media secondary sedimentation tank is set at the end of the phase separation anoxic tank. Therefore, the upper filtrate is further separated in the filter media secondary sedimentation tank and then enters the membrane filtration unit 6. The filter components in the filter media secondary sedimentation tank have a large specific surface area and are hollow, which can further adsorb suspended solids in the water. Finally, the water filtered by the membrane filtration unit enters the soilless cultivation tank 2, which can effectively absorb nitrates and achieve denitrification. Finally, the purified water is returned to the aquaculture system to provide oxygen for the fish.

[0038] In order to ensure that the wastewater in the fish pond can completely enter the wetland unit 3, the fish pond 1 disclosed in this embodiment is provided with a funnel-shaped waste storage cavity 11 at the bottom. The cross-sectional shape of the waste storage cavity in the vertical plane is a right triangle. The bottom tip of the waste storage cavity is close to the side wall of the fish pond 1. The inlet of the second connecting pipe is connected to the bottom tip of the waste storage cavity 11. In this way, a large amount of feces can accumulate in the waste storage cavity 11 and can eventually be completely discharged into the wetland unit 3.

[0039] This invention employs a funnel-shaped design for waste treatment, which makes waste discharge more convenient. In addition, a wetland system and a sludge return device are used to filter the water source, so that the water supplied to vegetables can minimize the ammonia nitrogen content. In other words, the eutrophication level of the water body is controlled to match the absorption rate of vegetables.

[0040] In summary, the fish-mushroom-vegetable symbiotic system disclosed in this utility model involves wastewater from a fishpond entering wetland unit 3. Wetland unit 3 is planted with emergent and herbaceous plants, arranged in a staggered pattern to form a rich root absorption network. Furthermore, the wetland unit contains filter media layers of varying particle sizes as carriers for microorganisms. The plants and the filter media of different particle sizes together form wetland unit 3 with highly efficient filtration and adsorption effects. The wastewater treated in wetland unit 3 then enters aerobic treatment unit 4. An aeration pump introduces air into the aerobic treatment unit. In an aerobic environment, microorganisms convert organic matter in the wastewater into ammonia and inorganic compounds. Subsequently, bacteria in the wastewater convert ammonia nitrogen into nitrates that can be absorbed by the plants. Polyphosphate-accumulating bacteria in the wastewater can absorb excessive amounts of phosphorus from the wastewater under aerobic conditions, resulting in phosphorus levels several times higher than those of ordinary bacteria. During this process, the microorganisms are in a mixed state within the aerobic treatment tank and form… The flocculent sludge, after exiting the aerobic treatment unit 4, enters the anoxic treatment tank. Under anaerobic conditions, polyphosphate-accumulating bacteria release inorganic phosphate (PO4) into the body. Simultaneously, the sludge containing a large number of polyphosphate-accumulating bacteria settles to the lower layer under the filtration of the stepped filter plate and its own weight, awaiting further treatment. Nitrates, inorganic phosphates, and other inorganic compounds that can be absorbed by plants float to the upper layer. The sludge in the anoxic section settles to the lower layer and accumulates under the filtration of the stepped filter plate and its own weight, forming a preliminary sludge-water separation state. The anoxic treatment unit 5 adopts a phase separation anoxic tank, and a secondary sedimentation tank for filter media is set at the end of the phase separation anoxic tank. Therefore, the filtrate in the upper layer is further separated in the secondary sedimentation tank for filter media before entering the membrane filtration unit 6. In this way, under the condition of lower suspended solids content, the membrane module can operate for a longer time. At the same time, by controlling the distribution of N and P through parameters such as aeration rate and hydraulic retention time, a water quality more suitable for vegetable cultivation can be obtained. In summary, the aquaponics system disclosed in this utility model can achieve optimal water filtration, monitoring of the fish's growth environment, and collection of excrement, making the fish farming environment more environmentally friendly. By recycling water resources, it reduces water consumption and alleviates pressure on water resources. Utilizing fish excrement as organic fertilizer for vegetables reduces the use of chemical fertilizers. At the same time, due to the ecological balance within the system, it also reduces the amount of pesticides used. The fish and vegetables in the system together form an ecological community, which helps improve soil quality and increase biodiversity.

[0041] The embodiments described above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited thereto. Any simple changes or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope disclosed in this utility model shall fall within the protection scope of this utility model.

Claims

1. A fish-bacteria-plant symbiotic system comprising a fish tank (1) and a soilless culture box (2), a waste water discharge port being provided at the bottom of the fish tank (1), nitrifying bacteria and phosphorus accumulating bacteria being also present in the waste water discharged from the waste water discharge port, characterized in that, Further comprising a microbial treatment assembly, the microbial treatment assembly comprising: an aerobic treatment unit (4) comprising an aerobic treatment tank, the liquid inlet of the aerobic treatment tank being in communication with the wastewater discharge port; an anoxic treatment unit (5) comprising an anoxic treatment tank, the liquid inlet of the anoxic treatment tank being in communication with the liquid outlet of the aerobic treatment unit (4) through a first connecting pipe, the first connecting pipe being arranged between the bottom of the aerobic treatment unit (4) and the anoxic treatment unit (5), and a filter plate being further arranged in the anoxic treatment unit (5), the liquid outlet on the upper side of the anoxic treatment tank being in communication with the soilless culture tank (2).

2. The fish-bacteria-plant symbiotic system according to claim 1, wherein The filter plate arranged in the anoxic treatment unit (5) is a stepped filter plate, and a plurality of stepped filter plates are arranged in sequence along the vertical direction.

3. The fish-bacteria-plant symbiotic system according to claim 1, wherein A sludge return pipe (9) is further arranged between the bottom of the aerobic treatment unit (4) and the anoxic treatment unit (5), a return pump being arranged on the sludge return pipe (9), and a sludge discharge port being further arranged on the sludge return pipe (9).

4. The fish-bacteria-plant symbiotic system according to claim 3, wherein A wetland unit (3) is further arranged between the wastewater discharge port of the fish tank (1) and the aerobic treatment unit (4), the liquid inlet of the wetland unit (3) being in communication with the wastewater discharge port through a second connecting pipe, and the liquid outlet of the wetland unit (3) being in communication with the liquid inlet of the aerobic treatment unit (4) through a third connecting pipe.

5. The fish-bacteria-plant symbiotic system according to claim 4, wherein From bottom to top, a sponge filter layer, a porous volcanic rock filter layer, and a soil layer are further arranged in the wetland unit (3).

6. The fish-bacteria-plant symbiotic system according to claim 4, wherein A membrane filtration unit (6) is further arranged between the liquid outlet of the anoxic treatment unit (5) and the soilless culture tank (2), the membrane filtration unit (6) comprising a filter tank (7) and a filter membrane assembly (8), the filter membrane assembly (8) being arranged vertically in the filter tank (7), and the filter membrane assembly (8) dividing the filter tank (7) into a dirty liquid cavity in communication with the anoxic treatment unit (5) and a clean liquid cavity in communication with the soilless culture tank (2).

7. The fish-bacteria-plant symbiotic system according to claim 6, wherein The liquid inlet of the aerobic treatment unit (4) is lower than the liquid outlet of the wetland unit (3).

8. The fish-bacteria-plant symbiotic system according to claim 6, wherein The liquid inlet of the dirty liquid cavity is lower than the liquid outlet of the anoxic treatment unit (5).

9. The fish-bacteria-plant symbiotic system according to claim 4, wherein A funnel-shaped waste storage cavity (11) is arranged at the bottom of the fish tank (1), the cross-sectional shape of the waste storage cavity (11) in the vertical plane is a right triangle, the bottom tip of the waste storage cavity (11) abutting against the side wall of the fish tank (1), and the liquid inlet of the second connecting pipe being in communication with the bottom tip of the waste storage cavity (11).

10. The fish-bacteria-plant symbiotic system according to claim 1, wherein An aeration pipe is arranged at the bottom of the aerobic treatment tank, and an aeration pump is arranged on the aeration pipe.

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