System and method for treating aquaculture wastewater by utilizing anaerobic and vertical ecological technologies

Abstract

The invention provides a system and a method for treating aquaculture wastewater by using anaerobic and vertical ecological technologies. Efficient purification of wastewater is realized through combination of an anaerobic tank, an aerobic tank and a vertical ecological wetland. The system comprises an anaerobic tank, an aerobic tank, a secondary sedimentation tank and a vertical ecological wetland which are sequentially arranged according to the flowing direction of aquaculture wastewater. The breeding wastewater is subjected to organic matter conversion and anaerobic phosphorus release in the anaerobic tank and is subjected to nitration reaction in the aerobic tank, and the vertical ecological wetland utilizes an LED full-spectrum vegetable light supplementing lamp to increase internal light. According to the method, wetland vegetation is fully utilized, the cost of aquaculture wastewater treatment is reduced, and the benefit of the treatment process is improved. The method disclosed by the invention is high in treatment efficiency, simple and convenient to operate and low in operation cost, avoids the defects of high energy consumption, large medicament consumption and unstable treatment efficiency in the prior art, is suitable for treating large-scale aquaculture wastewater, and has recycling and ecological benefits while removing pollutants.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and relates to a system and method for treating aquaculture wastewater by utilizing anaerobic and vertical ecological technologies. Background Art

[0002] In March 2010, the Population Division of the United Nations Department of Economic and Social Affairs released the "World Urbanization Prospects (2009 Revision)" at its headquarters in New York. The report predicts that with the advancement of urbanization, the global rural population will continue to decline, and by 2050, the rural population will be reduced to 2.9 billion. Therefore, it is necessary to address deep-seated ecological issues and consider the food crisis. Vertical ecological treatment of aquaculture wastewater is a highly efficient process that uses plants to treat aquaculture wastewater. It purifies aquaculture wastewater through five key stages: composting tanks, anaerobic tanks, aerobic tanks, and vertical ecological wetlands. Each stage promotes specific biochemical reactions to remove organic matter, nitrogen, phosphorus, and other pollutants from the aquaculture wastewater. However, existing aquaculture wastewater treatment processes have high aeration energy consumption in the anoxic / aerobic biochemical stages and high chemical consumption (phosphorus removal agents, carbon sources), resulting in high operating costs. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to solve the above problems and provide a system and method for treating aquaculture wastewater using anaerobic and vertical ecological technologies.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A system for treating aquaculture wastewater using anaerobic and vertical ecological technologies, comprising an anaerobic tank, an aerobic tank, a secondary sedimentation tank, and a vertical ecological wetland arranged in sequence according to the flow direction of the aquaculture wastewater;

[0006] The anaerobic tank is provided with a series of side flow reactors; the anaerobic tank is provided with a filling port, an exhaust port, a stirring paddle, a first water inlet, a first water outlet, a first return sludge inlet, and a first return sludge outlet; the side flow reactor is provided with a second water inlet and a second water outlet; the first water inlet and the second water outlet are connected through a constant temperature water bath pipe, and the second water inlet and the first water outlet are connected through a constant temperature water bath pipe, so that the anaerobic tank and the side flow reactor are circulated with water through the constant temperature water bath;

[0007] The aerobic pool is provided with an anoxic pool front section and an aerobic pool end section connected in series; the aerobic zone is provided with a third water inlet and a third water outlet, and the third water inlet is connected to the second water outlet through a pipe;

[0008] The secondary sedimentation tank is provided with a fourth water inlet, a fourth water outlet and a sludge outlet; the fourth water inlet is connected to the third water outlet through a pipe; a sludge external return pipe is also connected between the secondary sedimentation tank and the anaerobic tank, and the sludge outlet is connected to the first return sludge inlet through the sludge external return pipe;

[0009] The vertical ecological wetland cultivates vegetation, adopts LED full-spectrum vegetable fill lights to simulate natural light, and uses computers to automatically control the temperature, humidity, light, carbon dioxide concentration and nutrient solution during the plant growth process.

[0010] A method for treating aquaculture wastewater using anaerobic and vertical ecological technologies, wherein the aquaculture wastewater is treated using the above-mentioned system for treating aquaculture wastewater using anaerobic and vertical ecological technologies, wherein the wastewater is sequentially passed through a composting tank for dry-wet separation, organic matter conversion and the first anaerobic phosphorus release are carried out in an anaerobic tank, the second anaerobic phosphorus release is carried out in the front section of anoxic zone, nitrification is carried out in the rear section of an aerobic zone, sedimentation is carried out in a secondary sedimentation tank, and vegetation is cultivated in a vertical ecological wetland.

[0011] Furthermore, the total COD concentration in the treated aquaculture wastewater is preferably 40-120 mg / L, more preferably 50-110 mg / L, and most preferably 70-90 mg / L; COD preferably includes at least one of C_I (difficult to degrade soluble COD) and C_S (easily degradable soluble COD), and the concentration of C_I in the aquaculture wastewater is 10-60 mg / L, preferably 20-50 mg / L, and most preferably 30-40 mg / L; the concentration of C_S in the aquaculture wastewater is 30-60 mg / L, preferably 35-55 mg / L, and most preferably 40-50 mg / L.

[0012] Furthermore, the total nitrogen concentration in the aquaculture wastewater is preferably 38 to 55 mg / L, more preferably 38 to 55 mg / L. In the present invention, the total nitrogen preferably includes ammonia nitrogen (C_NH4 + ), nitrate (C_NO3 - ), C_ND (biodegradable soluble organic nitrogen), organic nitrogen in C_I, X_ND (biodegradable particulate organic nitrogen) and at least one of the organic nitrogen in X_S (easily degradable particulate COD).

[0013] Furthermore, the concentration of ammonia nitrogen in aquaculture wastewater is preferably 15-25 mg / L, more preferably 20-23 mg / L; the concentration of nitrate ion is preferably 10-20 mg / L, more preferably 14-16 mg / L; the concentration of C_ND is preferably 1-3 mg / L, more preferably 2-2.8 mg / L; the concentration of organic nitrogen in C_I is preferably 1-3 mg / L, more preferably 2-2.4 mg / L; the concentration of X_ND is preferably 1-3 mg / L, more preferably 1.6-2, and the concentration of organic nitrogen in X_S is preferably 0.1-0.3 mg / L, more preferably 0.15-0.2 mg / L.

[0014] Furthermore, the temperatures for organic matter conversion, first anaerobic phosphorus release, second anaerobic phosphorus release, nitrification, and precipitation are independently set to 15-25° C., more preferably 20-25° C. The hydraulic retention time of the composting tank is at least 20 days, more preferably 22 days; the hydraulic retention time of the last section of the anoxic zone is at least 3 hours, more preferably 3.5 hours, and the hydraulic retention time of the first section of the aerobic zone is at least 3 hours, more preferably 3.5 hours.

[0015] Furthermore, the dissolved oxygen (DO) concentration in the anaerobic tank is preferably 0.09 to 0.11 mg / L, more preferably 0.1 mg / L.

[0016] Furthermore, the total dissolved oxygen concentration in the aerobic tank is preferably 1 to 2 mg / L, more preferably 1 to 1.5 mg / L.

[0017] Furthermore, the precipitate obtained by precipitation is returned to the anaerobic tank, and the return ratio of the precipitate is 50-70%, preferably 55-65%, and most preferably 60%.

[0018] The beneficial effects of the present invention are:

[0019] The aquaculture wastewater treatment system provided by the present invention includes an anaerobic tank, an aerobic tank, and a vertical ecological wetland, arranged sequentially according to the flow of aquaculture wastewater. The aquaculture wastewater undergoes organic matter conversion and anaerobic phosphorus release in the anaerobic tank, and nitrification in the aerobic tank. This system replaces the existing oxidation pond biochemical treatment of aquaculture wastewater with a vertical ecological treatment system. LED full-spectrum vegetable supplementary lighting is also used to increase internal light. The wetland vegetation reduces the cost of aquaculture wastewater treatment, and the use of economical plants maximizes the efficiency of the treatment process, thereby reducing the cost and improving the efficiency of the treatment process.

[0020] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the principle of the method for treating aquaculture wastewater using anaerobic and vertical ecological technologies in the present invention.

[0023] Figure 2 、 3 , 4 are examples showing three implementation modes of the present invention. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] See also Figure 1, which is a system for treating aquaculture wastewater using anaerobic and vertical ecological technologies, including an anaerobic tank, an aerobic tank, a secondary sedimentation tank, and a vertical ecological wetland arranged in sequence according to the flow direction of the aquaculture wastewater; a flow-metering reactor is arranged in series in the anaerobic tank; the anaerobic tank is provided with a filling port, an exhaust port, a stirring paddle, a first water inlet, a first water outlet, a first return sludge inlet, and a first return sludge outlet; the flow-metering reactor is provided with a second water inlet and a second water outlet; the first water inlet and the second water outlet are connected by a constant temperature water bath pipe, and the second water inlet and the first water outlet are connected by a constant temperature water bath pipe, so that water circulation between the anaerobic tank and the flow-metering reactor is carried out through the constant temperature water bath;

[0028] The aerobic tank is provided with a front section of an anoxic tank and a terminal section of an aerobic tank connected in series; the aerobic zone is provided with a third water inlet and a third water outlet, and the third water inlet is connected to the second water outlet through a pipe; the secondary sedimentation tank is provided with a fourth water inlet, a fourth water outlet and a sludge outlet; the fourth water inlet is connected to the third water outlet through a pipe; a sludge external return pipe is also connected between the secondary sedimentation tank and the anaerobic tank, and the sludge outlet is connected to the first return sludge inlet through the sludge external return pipe;

[0029] Among them, the vertical ecological wetland uses buildings to cultivate vegetation in vertical spaces, uses LED full-spectrum vegetable fill lights to simulate natural light, and uses computers to automatically control the temperature, humidity, light, carbon dioxide concentration and nutrient solution during the plant growth process.

[0030] A method for treating aquaculture wastewater using anaerobic and vertical ecological technologies, wherein the aquaculture wastewater is treated using the above-mentioned system for treating aquaculture wastewater using anaerobic and vertical ecological technologies, wherein the wastewater is sequentially passed through a composting tank for dry-wet separation, organic matter conversion and the first anaerobic phosphorus release are carried out in an anaerobic tank, the second anaerobic phosphorus release is carried out in the front section of anoxic zone, nitrification is carried out in the rear section of an aerobic zone, sedimentation is carried out in a secondary sedimentation tank, and vegetation is cultivated in a vertical ecological wetland.

[0031] Among them, the total COD concentration in aquaculture wastewater is preferably 40-120 mg / L, more preferably 50-110 mg / L, and most preferably 70-90 mg / L; COD includes at least one of C_I (difficult to degrade soluble COD) and C_S (easily degradable soluble COD), and the concentration of C_I in aquaculture wastewater is preferably 10-60 mg / L, more preferably 20-50 mg / L, and most preferably 30-40 mg / L; the concentration of C_S in aquaculture wastewater is preferably 30-60 mg / L, more preferably 35-55 mg / L, and most preferably 40-50 mg / L.

[0032] The total nitrogen concentration in aquaculture wastewater is preferably 38 to 55 mg / L. The total nitrogen preferably includes ammonia nitrogen (C_NH4 + ), nitrate (C_NO3 -), C_ND (biodegradable soluble organic nitrogen), organic nitrogen in C_I, X_ND (biodegradable particulate organic nitrogen) and X_S (easily degradable particulate COD) at least one.

[0033] The concentration of ammonia nitrogen in aquaculture wastewater is preferably 15-25 mg / L, more preferably 20-23 mg / L; nitrate (C_NH4 + ) concentration is preferably 10-20 mg / L, more preferably 14-16 mg / L; the C_ND concentration is preferably 1-3 mg / L, more preferably 2-2.8 mg / L; the organic nitrogen concentration in C_I is preferably 1-3 mg / L, more preferably 2-2.4 mg / L; the X_ND concentration is preferably 1-3 mg / L, more preferably 1.6-2, and the organic nitrogen concentration in X_S is preferably 0.1-0.3 mg / L, more preferably 0.15-0.2 mg / L.

[0034] The temperatures for organic matter conversion, first anaerobic phosphorus release, second anaerobic phosphorus release, nitrification, and precipitation are independently set at 15-25°C, preferably 20-25°C. The hydraulic retention time of the composting tank is preferably 20 days, more preferably 22 days; the hydraulic retention time of the anaerobic tank is preferably 1 hour, more preferably 1.5 hours; the hydraulic retention time of the end of the anoxic zone is preferably 3 hours, more preferably 3.5 hours; and the hydraulic retention time of the first section of the aerobic zone is preferably 3 hours, more preferably 3.5 hours.

[0035] The dissolved oxygen (DO) concentration in the anaerobic tank is 0.09-0.11 mg / L, preferably 0.1 mg / L. The dissolved oxygen concentration in the anoxic tank is 0.3-0.4 mg / L, preferably 0.35 mg / L. The total dissolved oxygen concentration in the aerobic tank is 1-2 mg / L, preferably 1-1.5 mg / L. The precipitated sludge is preferably returned to the anaerobic tank (external sludge circulation); the sludge return ratio is 50-70%, preferably 55-65%, and most preferably 60%.

[0036] During the specific implementation process, vertical ecological wetlands can be arranged in various ways in combination with building conditions.

[0037] like Figure 2As shown, the building consists of three independent pyramids. The main structure of the pyramid farm has a near 1:1 ratio of above-ground to underground space. The first pyramid on the left is used for vertical livestock farming, providing meat for the city, including pig and chicken farming. The second pyramid is the main vertical farm, housing agricultural production, wastewater treatment, research, commercial, and public service facilities. The third pyramid is used for organic waste treatment, using anaerobic digestion to treat urban organic waste. The three pyramids are centered around the main vertical farm, connecting the city through key transportation infrastructure. A vertical farm market is located in the middle pyramid, leveraging public transportation to establish an urban sales network for the vertical farm. This vertical farm system encompasses agricultural production (meat, fruits, and vegetables), urban organic waste treatment, vertical farming-related functions, and an urban sales network. Regarding animal husbandry, the pyramid farm is designed as an independent pyramid, housing pigs and chickens. These two animals are common types of animals raised in vertical farms. Separate animal farms effectively collect animal waste and process it through anaerobic digestion. The resulting biogas, biogas, and biogas can be used for agricultural production and urban functions. In terms of plant cultivation, Pyramid Farm utilizes not only conventional production methods but also two other agricultural technologies: hydroponics and aeroponics. The vertical farm utilizes a fully enclosed indoor farm system, ensuring uninterrupted production year-round. The vertical farm uses anaerobic digestion to treat urban organic waste. In addition to agricultural production and urban organic waste and wastewater treatment, the main farm also houses research laboratories, restaurants, commercial and accommodation facilities, and a vertical garden system. These commercial functions enhance the economic viability of the vertical farm, adapting it to the rules of the market economy and helping it gradually break free from government support and survive on its own.

[0038] or as Figure 3As shown, the O-shaped vertical farm comprises 12 indoor floors, each 2,600 square meters, totaling over 30,000 square meters of quality-controlled indoor farming space. The fruit farm includes 25,000 square meters of quality-controlled outdoor space. An organic connection provides a 500-meter-long climbing space for plants. The main farm focuses on plant cultivation and aquaculture, including a two-story fruit farm. Plant cultivation includes both hydroponic and general crop cultivation. Supporting agricultural production facilities include storage and agricultural product processing. Accommodation, a restaurant, and a cafe are also provided as commercial amenities to enhance the farm's economic competitiveness. The fruit farm utilizes an existing urban parking lot. A pedestrian bridge connects the fruit farm and the main vertical farm. The "organic connection" is enclosed by a skeleton frame. The skeleton frame can be used to run electrical wires and provide space for climbing vines. The northern portion of the main vertical farm is primarily dedicated to crop cultivation, while the southern portion is dedicated to hydroponic cultivation and aquaculture. In cross-section, the ground floor and first floor house storage, an entrance hall, a café, and a restaurant, respectively. Mechanical equipment, plant level (steam production), and water storage are located between the functional floors. The farm's cross-section layout prioritizes the sunny north side (southern hemisphere) for crop production, utilizing natural light. Lower floors are used for auxiliary functions, while upper floors are dedicated to agricultural production, maximizing the use of natural light. Hydroponic farming utilizes an artificial environmental control system, a rotating platform, and LED (light-emitting diode) light sources to ensure uniform light distribution for plants, resulting in better taste and growth efficiency. The primary purpose of vertical farms is to meet food needs. With population growth, O-shaped vertical farms can be constructed on top of existing structures to add new farm space. Light shelves are used in the main farm, utilizing mirrored and reflective surfaces to increase internal light and provide natural light for indoor cultivation. The building's "organic connection" utilizes an alloy skeleton, encased in a molded resin. This layer of resin protects the alloy skeleton. Compared to alloy, the resin surface is more suitable for berries and vines to climb, just like they climb on trees. This "organic connection" not only serves transportation functions but also agricultural production functions, while also building an ecological urban environment.

[0039] Or as Figure 4As shown, the "Eco-Lab" processes domestic wastewater generated by the building's residential facilities. The resulting greywater is used for plant cultivation and general domestic use, and is further purified for use as drinking water within the area. The vertical farm uses nutrient-rich greywater, while domestic water is drinkable and high-quality greywater. Rainwater collected by the building, as high-quality greywater, enters the corresponding stages of the water system directly. To briefly summarize the water treatment process, domestic sewage enters the water treatment system, passes through anaerobic reactors, anaerobic reactors, and aerobic reactors, and then reaches the hydroponic tank. After this step, the water can be used as nutrient-rich greywater for the hydroponic crop system in the vertical farm. The remaining water is purified through a sedimentation system, a wetland system, and finally a UV filter, ultimately becoming drinkable for human consumption.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A system for treating aquaculture wastewater using anaerobic and vertical ecological technology, characterized in that: It includes anaerobic tanks, aerobic tanks, secondary sedimentation tanks, and vertical ecological wetlands arranged in sequence according to the flow direction of aquaculture wastewater; The anaerobic tank is provided with a series of side flow reactors; the anaerobic tank is provided with a filling port, an exhaust port, a stirring paddle, a first water inlet, a first water outlet, a first return sludge inlet, and a first return sludge outlet; the side flow reactor is provided with a second water inlet and a second water outlet; the first water inlet is connected to the second water outlet through a constant temperature water bath pipe, and the second water inlet is connected to the first water outlet through a constant temperature water bath pipe, so that the anaerobic tank and the side flow reactor are circulated through the constant temperature water bath; The aerobic pool is provided with a front section of an anoxic pool and a terminal section of an aerobic pool connected in series; the aerobic zone is provided with a third water inlet and a third water outlet, and the third water inlet is connected to the second water outlet through a pipeline; The second sedimentation tank is provided with a fourth water inlet, a fourth water outlet and a sludge outlet; the fourth water inlet is connected to the third water outlet through a pipeline; a sludge external return pipeline is also connected between the second sedimentation tank and the anaerobic tank, and the sludge outlet is connected to the first return sludge inlet through the sludge external return pipeline; The vertical ecological wetland uses buildings to cultivate vegetation in vertical spaces, uses LED full-spectrum vegetable fill lights to simulate natural light, and uses computers to automatically control the temperature, humidity, light, carbon dioxide concentration and nutrient solution during the plant growth process.

2. A method for treating aquaculture wastewater using anaerobic and vertical ecological technology, characterized in that: The aquaculture wastewater is treated by using the system for treating aquaculture wastewater using anaerobic and vertical ecological technologies as described in claim 1, wherein the sewage is sequentially separated into dry and wet parts in a composting tank, organic matter is transformed and the first anaerobic phosphorus release is carried out in an anaerobic tank, the second anaerobic phosphorus release is carried out in the front section of the anoxic zone, nitrification is carried out in the end section of the aerobic zone, sedimentation is carried out in a secondary sedimentation tank, and vegetation is cultivated in a vertical ecological wetland.

3. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 2, characterized in that: The total COD concentration in the treated aquaculture wastewater is 40-120 mg / L, and the total nitrogen concentration is 38-55 mg / L.

4. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 3, characterized in that: The COD in the treated aquaculture wastewater includes at least one of difficult-to-degrade soluble COD and easily degradable soluble COD. The concentration of the difficult-to-degrade soluble COD in the treated aquaculture wastewater is 10-60 mg / L, and the concentration of the easily degradable soluble COD is 30-60 mg / L.

5. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 3, characterized in that: The total nitrogen in the treated aquaculture wastewater includes at least one of ammonia nitrogen, nitrate, biodegradable soluble organic nitrogen, organic nitrogen in difficult-to-degrade soluble COD, biodegradable particulate organic nitrogen and easily degradable particulate COD.

6. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 5, characterized in that: The concentration of ammonia nitrogen in aquaculture wastewater is 15-25 mg / L, the concentration of nitrate ions is 10-20 mg / L, the concentration of biodegradable soluble organic nitrogen is 1-3 mg / L, the concentration of organic nitrogen in difficult-to-degrade soluble COD is 1-3 mg / L, the concentration of biodegradable particulate organic nitrogen is 1-3 mg / L, and the concentration of organic nitrogen in easily degradable particulate COD is preferably 0.1-0.3 mg / L.

7. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 2, characterized in that: The temperatures of organic matter transformation, first anaerobic phosphorus release, second anaerobic phosphorus release, nitrification and precipitation are independently set to 15-25°C. The hydraulic retention time of the composting pool is at least 20 days, the hydraulic retention time of the end of the anoxic zone is at least 3 hours, and the hydraulic retention time of the front of the aerobic zone is at least 3 hours.

8. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 2, characterized in that: The dissolved oxygen concentration in the anaerobic tank is 0.09-0.11 mg / L.

9. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 2, characterized in that: The total concentration of dissolved oxygen in the aerobic pool is 1-2 mg / L.

10. The method for treating aquaculture wastewater using anaerobic and vertical ecological technology according to claim 2, characterized in that: The precipitate obtained by precipitation is returned to the anaerobic tank, and the return ratio of the precipitate is 50-70%.

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