Water treatment system and method based on fish and vegetable symbiotic mode

Abstract

The invention discloses a water treatment system and method based on a fish and vegetable symbiosis mode, a culture module water body is separated through a cyclone separation technology, high-temperature sterilization and fermentation treatment is performed on a solid isolate through directional fermentation, sterilization treatment is performed on the separated water body through photocatalytic chemical reaction, online monitoring and an intelligent optimization algorithm are combined, and the fish and vegetable symbiosis mode is achieved. The PH value, the DO value, the COD value and the EC value in the water body of the culture module and the water culture module are dynamically regulated and controlled, the technical problems of sterilization pollution, low fermentation efficiency and different requirements of animals and plants on the water body microenvironment which are difficult to solve by a traditional system are effectively solved, and the system is suitable for large-scale ecological agriculture production and application.

Description

Technical Field

[0001] The present invention belongs to the technical field of ecological agriculture, and particularly relates to a water treatment system and method based on the aquaponics mode. Background Art

[0002] Aquaponics is a new ecological agriculture mode that combines aquaculture technology with hydroponic vegetable technology. By combining aquaculture and hydroponic cultivation with modern scientific and technological means, it realizes no water change in fish farming and no fertilization in vegetable growing, achieving a harmonious ecological balance among plants, animals, and microorganisms.

[0003] In the aquaponics system, the water from aquaculture is transported to the hydroponic cultivation system. Bacteria decompose ammonia nitrogen in the water into nitrite, and then nitrifying bacteria decompose it into nitrate, which can be directly absorbed and utilized by plants as nutrients. Aquaponics enables a harmonious ecological balance among animals, plants, and microorganisms, is a sustainable cyclic zero-emission low-carbon production mode, and is also an effective method to effectively solve the agricultural ecological crisis.

[0004] However, with the recycling of the aquaculture water body, water environmental pollution caused by aquaculture animal residual baits and excreta affects the composition structure of microorganisms in the water body. This will change the quantity and proportion of pathogenic bacteria and beneficial bacteria in the aquaculture water body, thus breaking the balance of the bacterial community structure and possibly causing diseases in the case of water quality deterioration.

[0005] Moreover, the most suitable water environment pH value for fish is 6.5 - 9.0, while the most suitable pH value for the root zone of crops is 5.8 - 6.2. In order for both fish and hydroponic vegetables to grow in the most suitable water environment, it is necessary to dynamically adjust the pH value of the water body in the aquaponics mode. Summary of the Invention

[0006] The purpose of the present invention is to provide a water treatment system and method based on the aquaponics mode to solve the problems raised in the above background art.

[0007] The purpose of the present invention is achieved through the following technical solutions.

[0008] A water treatment system based on the aquaponics mode, which is a closed water body circulation system, includes an aquaculture module, a vortex solid-liquid separator, a sterilization module, a nitrification module, and a hydroponic module connected in sequence through pipelines. It is characterized in that: it is also provided with a multi-parameter water quality monitoring module and a machine learning optimization control module to dynamically regulate the pH value, COD value, DO value, and EC value in the water bodies of the aquaculture module and the hydroponic module.

[0009] Furthermore, a water treatment system based on the aquaponics mode is characterized in that: a directional fermentation tank is further provided, which ferments and processes the fish solid excrement and its feed residues separated by the hydrocyclone solid-liquid separator; the inlet of the directional fermentation tank is communicated with the hydrocyclone solid-liquid separator, and the outlet is communicated with the nitrification module.

[0010] Furthermore, a water treatment system based on the aquaponics mode is characterized in that: the directional fermentation tank includes a temperature gradient control unit and an automatic fermentation bacteria dosing unit, which can realize the dual-temperature zone control of 55-65 °C and 40-45 °C and the dosing of multiple strains of bacteria.

[0011] Furthermore, a water treatment system based on the aquaponics mode is characterized in that: the sterilization module includes an ultraviolet lamp and a TiO2 photocatalytic net, and the ultraviolet light irradiates the TiO2 photocatalytic net to generate electron-hole pairs, which react electrochemically with water to achieve efficient sterilization of the water body.

[0012] Furthermore, a water treatment system based on the aquaponics mode is characterized in that: the hydroponics module is provided with an adjustable spectrum LED supplementary lighting system and a root environment monitoring probe controlled by a machine learning optimization control module.

[0013] Furthermore, a water treatment system based on the aquaponics mode is characterized in that it further includes:

[0014] A first variable-frequency water pump, arranged in the circulation pipeline between the aquaculture module and the hydrocyclone solid-liquid separator, is used to control the water flow rate entering the hydrocyclone solid-liquid separator to achieve the best solid-liquid separation effect;

[0015] A second variable-frequency water pump, arranged in the circulation pipeline between the nitrification module and the hydroponics module, is linked with the first variable-frequency water pump under the control of the machine learning optimization control module, and is used to transport the nitrified water body to the hydroponics module.

[0016] Furthermore, a water treatment system based on the aquaponics mode is characterized in that the multi-parameter water quality monitoring module includes:

[0017] A hydroponics module PH value regulation unit arranged on the circulation pipeline between the nitrification module and the hydroponics module, including a hydroponics module PH value on-line detector and an acidic substance dosing device;

[0018] A aquaculture module PH value regulation unit arranged on the circulation pipeline between the hydroponics module and the aquaculture module, including an aquaculture module PH value on-line detector and an alkaline substance dosing device.

[0019] Furthermore, a water treatment system based on the aquaponics mode is characterized in that the multi-parameter water quality monitoring module further includes:

[0020] The multi-parameter on-line water quality monitor set in the nitrification module is used to monitor the COD, DO, EC, ammonia nitrogen, total nitrogen, total phosphorus values and water temperature of the circulating water body;

[0021] The nitrifying bacteria dosing device set in the nitrification module is used to regulate the nitrification rate of the circulating water body;

[0022] The aeration device set in the aquaculture module is used to transport oxygen into the circulating water body;

[0023] The trace element dosing device set in the nitrification module is used to dose trace elements required for the growth of animals and plants into the circulating water body;

[0024] The water replenishing branch controlled by an electric valve is set between the nitrification module and the hydroponic module;

[0025] The drainage branch controlled by an electric valve is set between the nitrification module and the sterilization module.

[0026] Furthermore, a water treatment system based on the fish-vegetable symbiosis mode is characterized in that: the hydroponic module is provided with an adjustable spectrum LED light supplementing unit, a root monitoring probe and a stem and leaf detection probe controlled by a machine learning optimization control module.

[0027] Furthermore, a water treatment system based on the fish-vegetable symbiosis mode is characterized in that: the machine learning optimization control module can automatically adjust and optimize the system control parameters by analyzing the system operation parameters; the machine learning optimization control module performs time series data analysis on the collected and input parameters by using an LSTM neural network to achieve the optimal output parameter control; the specific parameters include:

[0028] Collected parameters: COD, DO, EC, ammonia nitrogen, total nitrogen, total phosphorus values and water temperature values of the circulating water body, PH values of the hydroponic module and the aquaculture module, and vegetable root images and stem and leaf images;

[0029] Input parameters: fish yield, vegetable yield;

[0030] Output parameters: acid substance dosing amount, alkaline substance dosing amount, nitrifying bacteria dosing amount, trace element dosing amount, fermenting bacteria dosing amount, frequency of the variable frequency water pump, opening and closing of the water replenishing branch and the drainage branch, and operation duration, illuminance and emission wavelength of the LED light supplementing unit in the hydroponic module.

[0031] Furthermore, a water treatment method of a water treatment system based on the fish-vegetable symbiosis mode is characterized in that the method includes the following steps:

[0032] S10: Input the water body of the aquaculture module into a cyclone solid-liquid separator for solid-liquid separation;

[0033] S20: Perform two-stage fermentation treatment of high-temperature hydrolysis sterilization and medium-temperature synthesis on the solids separated by the cyclone solid-liquid separator; perform photocatalytic sterilization treatment on the liquid separated by the cyclone solid-liquid separator;

[0034] S30: Transport the fermented solids and the sterilized water body to the nitrification module for nitrification treatment;

[0035] S40: Adjust the pH value of the nitrified water body to be suitable for the growth of vegetables;

[0036] S50: Input the above water body into the hydroponic module;

[0037] S60: Regulate the pH value of the water body flowing out of the hydroponic module to adapt to the growth of fish;

[0038] S70: Transport the above-treated water body to the aquaculture module to complete the circulation of the water body in the fish-vegetable symbiosis mode.

[0039] A water treatment system and method based on the fish-vegetable symbiosis mode of the present invention separates the water body of the aquaculture module through cyclone separation technology, performs high-temperature sterilization and fermentation treatment on the solid separation by directional fermentation, performs sterilization treatment on the separated water body through photocatalytic chemical reaction, combines online monitoring and intelligent optimization algorithms, and dynamically regulates the pH value, DO value, COD value, and EC value in the water bodies of the aquaculture module and the hydroponic module, effectively solving the technical problems of sterilization pollution, low fermentation efficiency, and different requirements of animals and plants for the water microenvironment that are difficult to solve in traditional systems, and is suitable for large-scale ecological agricultural production applications. Brief Description of the Drawings

[0040] Figure 1 It is a schematic diagram of the composition of a water treatment system based on the fish-vegetable symbiosis mode of the present invention.

[0041] Figure 2 It is a flowchart of the treatment method of a water treatment system based on the fish-vegetable symbiosis mode of the present invention. Detailed Embodiments

[0042] In order to make the purpose, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0043] Such as Figure 1As shown in the figure, it is a flowchart of a water treatment system based on the aquaponics mode of the present invention. The water treatment system based on the aquaponics mode is a closed water body circulation system, which includes a cultivation module 100, a cyclone solid-liquid separator 200, a sterilization module 300, a nitrification module 400, and a hydroponics module 500 connected in sequence through pipelines. The connecting pipelines can be closed pipelines, or open water channels or water tanks. Technicians can adopt the most reasonable layout according to the on-site situation.

[0044] The cultivation module 100 includes a cultivation pond and an aeration device. The aeration device is used to supplement the oxygen consumed by fish respiration in the cultivation water body and improve the COD value of the water body. The water body of the cultivation module 100 flows to the cyclone solid-liquid separator 200. A first variable frequency water pump 601 is arranged at the inlet end of the cyclone solid-liquid separator 200. By controlling the inlet flow rate of the cyclone solid-liquid separator 200, the best solid-liquid separation effect can be obtained.

[0045] The liquid outlet end of the cyclone solid-liquid separator 200 is communicated with the sterilization module 300. An LED ultraviolet lamp and a photocatalytic net coated with a TiO2 nano-coating are arranged in the sterilization module 300. The TiO2 nano-coating generates electron-hole pairs under the irradiation of the LED ultraviolet light. When the water body passes through the TiO2 photocatalytic net, a photocatalytic reaction occurs with the electron-hole pairs, generating strongly oxidizing hydroxyl radicals and superoxide radicals, realizing the efficient killing of germs in the water body. The emission intensity of the LED ultraviolet lamp can be dynamically adjusted according to the COD value of the water body. For every 50 mg / L increase in the COD value of the water body, the emission intensity of the LED ultraviolet lamp increases by 20 μW / cm 2 。

[0046] The solid outlet end of the cyclone solid-liquid separator 200 is connected to a directional fermentation tank 700, which ferments and processes the fish solid excreta and its feed residues separated by the cyclone solid-liquid separator 200.

[0047] The directional fermentation tank 700 includes a stainless steel fermentation tank body, a temperature gradient control unit, and a fermentation bacteria automatic dosing unit. The temperature gradient control unit can realize the dual-temperature zone control of 55-65°C and 40-45°C for the fermentation tank body. In this embodiment, the control temperature of the high-temperature zone of the fermentation tank is 62±1°C, and the control temperature of the low-temperature zone of the fermentation tank is 43±1°C.

[0048] The automatic inoculant adding unit for fermenting bacteria has separate dosing ports corresponding to the high-temperature area and the low-temperature area of the fermenter, enabling the dosing of different strains of bacteria in the high-temperature and low-temperature areas. In this embodiment, a suspension of Bacillus subtilis is dosed in the high-temperature area of the fermenter, and freeze-dried Lactobacillus plantarum is dosed in the low-temperature area of the fermenter. Bacillus subtilis has a strong inhibitory effect on harmful microorganisms such as Vibrio, Escherichia coli, and baculovirus in aquaculture, can decompose toxic and harmful substances in the aquaculture water body, purify the water quality, and at the same time can decompose residual baits, feces, and organic matters in the pond. Lactobacillus can decompose organic waste and fish urine, can inhibit some harmful bacteria and fungi, and can also enhance the nutritional value of feed and improve the immunity of fish.

[0049] At the initial stage of fermentation, a higher temperature is adopted, which can not only promote the rapid reproduction and metabolic fermentation of microorganisms, but also cooperate with the bacteriostatic effect of Bacillus subtilis to kill most harmful bacteria. As the fermentation progresses, the temperature is lowered to slow down the metabolic rate of microorganisms, thereby increasing the accumulation of target products. This variable-temperature fermentation strategy can better control the fermentation process and optimize the production of products.

[0050] The outlet of the directional fermenter 700 discharges the fermented solid materials into the nitrification module 400 through a conveyor belt.

[0051] The nitrification module 400 is equipped with a nitrification tank, a nitrifying bacteria dosing device, a trace element dosing device, and a multi-parameter on-line water quality monitor. The nitrifying bacteria dosing device is used to dose nitrifying bacteria into the nitrification tank. Through the action of nitrifying bacteria, ammonia and nitrite in the water are converted into nitrates for plants to absorb and utilize, thereby purifying the water quality. The trace element dosing device is used to dose trace elements required for the growth of animals and plants into the circulating water body. The multi-parameter on-line water quality monitor is used to monitor the COD, DO, EC, ammonia nitrogen, total nitrogen, total phosphorus values, and water temperature of the circulating water body.

[0052] The water body treated by the nitrification module is transported to the hydroponic module 500 through the second variable-frequency water pump 602. A pH value regulation unit 610 for the hydroponic module is also provided between the nitrification module 400 and the second variable-frequency water pump 602, including an on-line pH detector for the hydroponic module and an acidic substance dosing device. Acidic substances are added to the water body entering the hydroponic module through the acidic substance dosing device to regulate the pH value range of the water body entering the hydroponic module to 5.8 - 6.2 to maintain the most suitable water environment for plant roots. The acidic substances can be selected from acidic substances such as nitric acid, hydrochloric acid, phosphoric acid, acetic acid, and citric acid. Nitric acid and phosphoric acid are preferred, which can not only adjust the pH value of the water body to acidic, but also supplement the nitrogen and phosphorus elements necessary for plant growth. In this embodiment, dilute nitric acid with a concentration of 5% is selected as the pH value regulator for the water body of the hydroponic module.

[0053] The hydroponic module 500 includes a hydroponic tank, an adjustable-spectrum LED supplementary lighting unit, a root monitoring probe, and a stem and leaf detection probe. The adjustable-spectrum LED supplementary lighting unit can emit light with a wavelength adjustable within the range of 400 - 700 nm, and its emission power can be regulated by changing the voltage supplied to the LED lamp core. The light wavelengths required for plant photosynthesis are around 400 - 700 nm. Within this range, light of different wavelengths has different effects on plant photosynthesis. For example, violet light can promote root growth and nutrient absorption in plants, green light can promote leaf expansion and growth in plants, yellow light can promote flower bud differentiation and flowering in plants, blue light mainly promotes the growth of stems and leaves in plants. It can promote the growth of young leaves and the elongation of stems, enabling plants to have a better growth form. Red light mainly has a positive impact on plant flowering, fruiting, and extending the flowering period. It can promote plant flowering and fruiting, while extending the flowering period, enabling plants to carry out photosynthesis and nutrient absorption for a longer time. Red light can also promote the growth of plant stems. Therefore, according to different plant requirements and growth stages, the spectral combination of the LED supplementary lighting unit can be adjusted to maximize plant growth and development.

[0054] The water body of the hydroponic module 500 flows towards the aquaculture module 100 by gravity. Before the water body enters the aquaculture module 100, there is also provided an aquaculture module PH value regulation unit 620, which includes an online detector for the PH value of the aquaculture module and an alkaline substance dosing device. Alkaline substances are added to the water body entering the aquaculture module through the alkaline substance dosing device to regulate the PH value range of the water body entering the aquaculture module to 6.5 - 9.0 to maintain the most suitable water environment for fish survival. The alkaline substances can be selected from alkaline substances such as calcium oxide, calcium hydroxide, potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, etc. Calcium oxide is preferably selected, which can not only adjust the water body PH value to alkaline, but also react with water to generate oxygen, achieving the effect of increasing oxygen in the water body.

[0055] A makeup water branch 630 is also bypassed in the water pipeline between the nitrification module 400 and the hydroponic module 500. The opening and closing of the makeup water branch are controlled by an electric valve to supplement the water lost during the water body circulation process and adjust the EC value in the water body.

[0056] A drainage branch 640 is also bypassed in the water pipeline between the nitrification module 400 and the sterilization module 300. The opening and closing of the drainage branch are controlled by an electric valve to drain part of the water body when the EC value in the water body is too high to adjust the EC value in the water body.

[0057] In a water treatment system based on the fish-vegetable symbiotic mode of the present invention, a machine learning optimization control module is further provided. The machine learning optimization control module can automatically adjust and optimize the system control parameters by analyzing the system operation parameters. The machine learning optimization control module performs time series data analysis on the collected and input parameters by using an LSTM neural network to achieve optimal output parameter control. The specific parameters include:

[0058] Collected parameters: COD, DO, EC, ammonia nitrogen, total nitrogen, total phosphorus values and water temperature value of the circulating water body, PH values of the hydroponic module and the aquaculture module, as well as vegetable root images and stem and leaf images;

[0059] Input parameters: fish yield, vegetable yield;

[0060] Output parameters: dosage of acidic substances, dosage of alkaline substances, dosage of nitrifying bacteria, dosage of trace elements, dosage of fermenting bacteria, frequency of the variable frequency water pump, opening and closing of the water replenishment branch and the drainage branch, as well as operation duration, illuminance and emission wavelength of the LED supplementary lighting unit of the hydroponic module.

[0061] As Figure 2 shown, it is a flowchart of a water treatment method for a water treatment system based on the fish-vegetable symbiotic mode of the present invention. The water treatment method includes the following steps:

[0062] S10: Input the water body of the aquaculture module into a hydrocyclone solid-liquid separator for solid-liquid separation;

[0063] S20: Perform two-stage fermentation treatment of high-temperature hydrolysis sterilization and medium-temperature synthesis on the solids separated by the hydrocyclone solid-liquid separator; perform photochemical sterilization treatment on the liquid separated by the hydrocyclone solid-liquid separator;

[0064] S30: Transport the fermented solids and the sterilized water body to a nitrification module for nitrification treatment;

[0065] S40: Adjust the PH value of the nitrified water body to be suitable for the growth of vegetables;

[0066] S50: Input the above water body into the hydroponic module;

[0067] S60: Regulate the PH value of the water body flowing out of the hydroponic module to adapt to the growth of fish;

[0068] S70: Transport the above-treated water body to the aquaculture module to complete the circulation of the water body in the fish-vegetable symbiotic mode.

[0069] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0070] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water treatment system based on the aquaponics mode. The treatment system is a closed water body circulation system, including an aquaculture module (100), a vortex solid-liquid separator (200), a sterilization module (300), a nitrification module (400), and a hydroponics module (500) that are sequentially connected by pipelines. It is characterized in that: There is also a multi-parameter water quality monitoring module and a machine learning optimization control module, which dynamically regulate the pH value, COD value, DO value and EC value in the water bodies of the aquaculture module (100) and the hydroponic module (500).

2. The water treatment system based on the aquaponics mode according to claim 1, characterized in that: There is also an oriented fermenter (700) for fermenting and treating the fish solid excrement and its feed residues separated by the cyclone solid-liquid separator (200); the inlet of the oriented fermenter (700) is connected to the cyclone solid-liquid separator (200), and the outlet is connected to the nitrification module (400).

3. The water treatment system based on the aquaponics mode according to claim 2, characterized in that: The said oriented fermenter (700) includes a temperature gradient control unit and an automatic fermenting bacteria dosing unit, which can realize the dual-temperature zone control of 55-65 °C and 40-45 °C and the dosing of multiple strains of bacteria.

4. The water treatment system based on the aquaponics mode according to claim 1, wherein: The sterilization module (300) includes an ultraviolet lamp and a TiO2 photocatalytic net. Electron-hole pairs are generated by irradiating the TiO2 photocatalytic net with ultraviolet light and undergo an electrochemical reaction with water to achieve efficient sterilization of the water body.

5. A water treatment system based on the aquaponics mode according to claim 1, characterized in that, There is also:[[]]END]] The first variable-frequency water pump (601) is arranged in the circulation pipeline between the aquaculture module (100) and the cyclone solid-liquid separator (200) to control the water flow rate entering the cyclone solid-liquid separator (200) to obtain the best solid-liquid separation effect. The second variable-frequency water pump (602) is arranged in the circulation pipeline between the nitrification module (400) and the hydroponic module (500), and is linked with the first variable-frequency water pump (601) under the control of the machine learning optimization control module to transport the nitrified water body to the hydroponic module (500).

6. The water treatment system based on the aquaponics mode according to claim 1, wherein The said multi-parameter water quality monitoring module includes:[[]]END]] The pH value regulation unit (610) of the hydroponic module arranged on the circulation pipeline between the nitrification module (400) and the hydroponic module (500), including an on-line pH value detector of the hydroponic module and an acidic substance dosing device. The pH value regulation unit (620) of the aquaculture module arranged on the circulation pipeline between the hydroponic module (500) and the aquaculture module (100), including an on-line pH value detector of the aquaculture module and an alkaline substance dosing device.

7. The water treatment system based on the aquaponics mode according to claim 1, wherein, The said multi-parameter water quality monitoring module also includes:[[]]END]] A multi-parameter on-line water quality monitor arranged in the nitrification module (400) to monitor the COD, DO, EC, ammonia nitrogen, total nitrogen, total phosphorus values and water temperature of the circulating water body. A nitrifying bacteria dosing device arranged in the nitrification module (400) to regulate the nitrification rate of the circulating water body. An aeration device arranged in the aquaculture module (100) to transport oxygen into the circulating water body. A trace element dosing device arranged in the nitrification module (400) to dose trace elements required for the growth of animals and plants into the circulating water body. A water replenishment branch (630) controlled by an electric valve arranged between the nitrification module (400) and the hydroponic module (500). A drainage branch (640) controlled by an electric valve arranged between the nitrification module (400) and the sterilization module (300).

8. A water treatment system based on the aquaponics mode according to claim 1, characterized in that: The said hydroponic module (500) is provided with an adjustable spectrum LED supplementary lighting unit, a root monitoring probe and a stem and leaf detection probe controlled by a machine learning optimization control module.

9. The water treatment system based on the aquaponics mode according to claim 1, characterized in that: The machine learning optimization control module can automatically adjust and optimize the system control parameters by analyzing the system operation parameters. The machine learning optimization control module performs time series data analysis on the collected and input parameters using an LSTM neural network to achieve optimal output parameter control. The specific parameters include: Collected parameters: COD, DO, EC, ammonia nitrogen, total nitrogen, total phosphorus values and water temperature value of the circulating water body, PH values of the hydroponic module and the aquaculture module, as well as vegetable root images and stem and leaf images; Input parameters: fish yield, vegetable yield; Output parameters: dosage of acidic substances, dosage of alkaline substances, dosage of nitrifying bacteria, dosage of trace elements, dosage of fermenting bacteria, frequency of the variable frequency water pump, opening and closing of the water replenishment branch and the drainage branch, as well as the operation duration, illuminance and emission wavelength of the LED supplementary lighting unit of the hydroponic module.

10. The water treatment method of a water treatment system based on the aquaponics mode according to claim 1, characterized in that, The method includes the following steps: S10: Input the water body of the aquaculture module into a hydrocyclone for solid-liquid separation; S20: Perform two-stage fermentation treatment of high-temperature hydrolysis sterilization and medium-temperature synthesis on the solids separated by the hydrocyclone; perform photochemical sterilization treatment on the liquids separated by the hydrocyclone; S30: Transport the fermented solids and the sterilized water body to the nitrification module for nitrification treatment; S40: Adjust the PH value of the nitrified water body to be suitable for the growth of vegetables; S50: Input the above water body into the hydroponic module; S60: Regulate the PH value of the water body flowing out of the hydroponic module to adapt to the growth of fish; S70: Transport the above-treated water body to the aquaculture module to complete the circulation of the water body in the fish-vegetable symbiotic mode.

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