An inland factory-scale seawater aquaculture tailwater treatment and reuse system

Abstract

An inland, factory-scale, seawater aquaculture tailwater treatment and reuse system includes a sedimentation tank, a truss scraper, an aerated biological filter, a lift pump, a three-stage anaerobic fermentation tank, an algae-bacteria symbiotic wind screen ecosystem, and a medium-pressure ultraviolet disinfector. Wastewater passes through a horizontal flow sedimentation tank to separate solid particles and suspended matter, such as leftover bait and fish and shrimp excrement. The supernatant passes through an aerated biological filter equipped with brush filter media to further physically intercept fine suspended matter and biochemically decompose harmful substances. The truss scraper deposits sediment in the sedimentation tank's sludge accumulation area. The sediment undergoes anaerobic fermentation in a three-stage anaerobic fermentation tank, trapping fecal matter and removing insect eggs and pathogenic microorganisms. The algae-bacteria symbiotic wind screen ecosystem's spraying device is connected to a collection device to remove ammonia, nitrite, and nitrate nitrogen from the water. The effluent is sterilized and disinfected in a medium-pressure ultraviolet disinfector before being reused in the aquaculture pond. This ensures that the aquaculture tailwater meets standard treatment and is recycled, significantly reducing aquaculture costs.

Description

Technical Field

[0001] The present invention relates to the technical field of inland industrialized seawater aquaculture tail water treatment, in particular to an inland industrialized seawater aquaculture tail water treatment and reuse system. Background Art

[0002] Inland factory-scale seawater aquaculture simulates an ecological environment similar to that of marine aquaculture. By recirculating aquaculture water and optimizing the aquaculture environment, the system overcomes seasonal and temperature constraints, achieving a high-density, high-yield marine aquaculture model that conserves water, electricity, and land. However, current factory-scale recirculating aquaculture processes still regularly discharge approximately 5% to 10% of tailwater. This tailwater contains leftover bait, aquaculture waste, and dead aquatic products, and is high in ammonia nitrogen, nitrite, nitrate, hydrogen sulfide, and harmful microorganisms. According to current local aquaculture tailwater discharge standards, traditional aquaculture tailwater treatment systems struggle to meet these standards. Furthermore, traditional aquaculture tailwater treatment systems suffer from insufficient carbon sources for microbial biochemical reactions. Improper carbon source replenishment not only increases the cost of treating the tailwater but also makes it more difficult. Furthermore, if the prepared seawater cannot be fully recycled, the cost of preparing the seawater will increase, significantly increasing aquaculture costs. In summary, the design of an inland factory-scale seawater aquaculture tailwater treatment and reuse system, which recycles and reuses all aquaculture tailwater after treatment, not only responds to the central government's plan to transfer coastal industries to the central and western regions, but also greatly reduces aquaculture costs by achieving reuse standards through full-circulation treatment. Summary of the Invention

[0003] The purpose of the present invention is to provide an inland factory-scale seawater aquaculture tailwater treatment and reuse system, which removes harmful substances such as ammonia nitrogen, nitrite, nitrate, etc. in the aquaculture tailwater without adding additional carbon sources, so that the tailwater can be reused as aquaculture water after treatment, meeting the goal of achieving healthy and high-yield aquaculture, realizing inland seawater recycling aquaculture, and reducing aquaculture costs.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] An inland factory-scale seawater aquaculture tailwater treatment and reuse system, characterized by comprising a sedimentation tank, an aerated biological filter, a three-stage anaerobic fermentation tank, an algae-bacteria symbiotic wind screen ecosystem, a medium-pressure ultraviolet sterilizer, and several lift pumps and pipelines;

[0006] The sedimentation tank is composed of a sludge accumulation area and a sedimentation area. Both the sludge accumulation area and the sedimentation area are provided with a slope. The sludge accumulation area is a funnel structure. A truss scraper is provided in the sludge accumulation area to scrape the sludge in the sedimentation area into the sludge accumulation funnel.

[0007] The aerated biological filter is arranged at the outlet of the sedimentation tank, and the tail water flows into the aerated biological filter through the overflow trough. A brush-type biofilm is set as a suspended filter material and microbial carrier, and aeration pipes are evenly arranged at the bottom;

[0008] A second pipe is set at the bottom of the sedimentation tank sludge accumulation area to connect to the sludge lifting pump inlet, and the sludge lifting pump outlet is connected to the three-stage anaerobic fermentation tank, which consists of a primary anaerobic zone, a secondary anaerobic zone and a clarification zone.

[0009] The aerated biological filter and the three-stage anaerobic fermentation tank are connected to the algae-bacteria symbiotic wind screen ecosystem through a first pipeline;

[0010] The algae-bacteria symbiotic wind screen ecosystem includes a collection device, a spraying device, a circulation device and a purification device; the collection device is composed of a first collection tank and a second collection tank; the spraying device is composed of a first spraying member and a second spraying member, the input end of the first spraying member is connected to the first collection tank, and the second spraying member is connected to the second collection tank; the circulation device is composed of two lifting pumps in the first collection tank and two lifting pumps in the second collection tank; the purification device is composed of an algae-bacteria wind screen biofilm and a biological filter bed, the number of the algae-bacteria wind screen biofilms is multiple and they are arranged vertically side by side at intervals, and the biological filter bed is arranged between the algae-bacteria wind screen biofilm and the first collection tank and the second collection tank;

[0011] The inlet end of the medium-pressure ultraviolet sterilizer is connected to the lifting pump in the second collection pool in the algae-bacteria symbiotic wind screen ecosystem, and the outlet end is connected to the breeding pool.

[0012] Furthermore, the mud accumulation area is a rectangular funnel structure, the length, width and height ratio of the funnel bottom is 2:2:1.73, the bottom slope is set to 60°, and the bottom slope of the sedimentation area is set to 3°.

[0013] Furthermore, two vertical partition boards are provided in the body of the three-stage anaerobic fermentation tank to separate the three compartments, and pipe openings are provided on the partition boards. The position of pipe opening 1 on the partition board between the primary anaerobic zone and the secondary anaerobic zone is lower than that of pipe opening 2 on the partition board between the secondary anaerobic zone and the clarification zone. The capacity of the primary anaerobic zone is greater than that of the secondary anaerobic zone and is smaller than that of the clarification zone.

[0014] Furthermore, the brush-type biofilms of the aerated biological filter are evenly distributed at intervals of 10 cm, and the brushes have a diameter of 10-18 cm and a length of 50-150 cm.

[0015] Furthermore, the output ends of the first spray piece and the second spray piece of the algae-bacteria symbiotic wind screen ecosystem are a number of evenly distributed spray heads, which are located above the algae-bacteria wind screen biofilm and are used to spray wastewater onto each algae-bacteria wind screen biofilm.

[0016] Furthermore, the biofilter bed is composed of a first biofilter bed and a second biofilter bed; the filter material of the first biofilter bed is straw crushing material and rice husk, the particle size of the straw crushing material is 0.5-1 cm, and the filter material laying thickness is 20-30 cm; the filter material of the second biofilter bed is ceramsite and gravel, the particle size of the ceramsite is 1.0-1.5 cm, the particle size of the gravel is 0.3-0.6 cm, and the filter material laying thickness is 10-15 cm.

[0017] Furthermore, the algae-bacteria wind screen biofilm (45) is 5 m high and 2 mm thick.

[0018] Furthermore, aeration pipes are evenly arranged at the bottom of the first collection tank of the algae-bacteria symbiotic wind screen ecosystem for intermittent aeration, and the dissolved oxygen content in the first collection tank is controlled between 0.2-0.8 mg / L to promote the simultaneous nitrification and denitrification reaction of the wastewater; K5 filler is added to the first collection tank to promote the attachment and growth of nitrifying bacteria and denitrifying bacteria, and the filling amount is 12 kg / m.

[0019] Furthermore, the algae-bacteria symbiotic wind screen ecosystem is provided with a first water inlet pipe connected to the first pipeline, and a second water inlet pipe connected to the lift pump in the first collection tank. The outlet ends of the first and second water inlet pipes are T-shaped, and the outlet pipe walls are provided with a plurality of circular drainage holes with a diameter of 0.15-0.4 cm.

[0020] Another technical solution of the present invention is: a method for treating and reusing tail water from industrial aquaculture, using the tail water treatment and reuse system described above, characterized in that it comprises the following steps:

[0021] Step 1: Factory aquaculture wastewater enters the sedimentation tank, where solid-liquid separation is achieved through natural sedimentation, removing suspended solids such as leftover bait, excrement, and residual organic debris from aquatic products. The precipitated sludge is scraped by a truss scraper into a sludge hopper.

[0022] Step 2: The effluent from the sedimentation tank enters the aerated biological filter, where the brush-type biofilm further intercepts fine suspended solids. At the same time, attached microorganisms undergo biochemical reactions to convert organic matter in the wastewater into nitrogen and phosphorus nutrients.

[0023] Step 3: The sludge from the sedimentation tank enters the third-stage anaerobic fermentation tank through the sludge lifting pump to achieve the functions of intercepting solid sludge, anaerobic fermentation and removing pathogenic microorganisms such as insect eggs;

[0024] Step 4: The effluent from the aerated biological filter and the three-stage anaerobic fermentation tank enters the algae-bacteria symbiotic wind screen ecosystem through the first pipeline for two-stage biological treatment. In the first treatment, the algae-bacteria wind screen biofilm undergoes aerobic nitrification and the first collection tank undergoes anoxic synchronous nitrification and denitrification to remove ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen. In the second treatment, the algae-bacteria wind screen biofilm undergoes aerobic nitrification and the second collection tank undergoes anaerobic denitrification to further enhance the removal of nitrite nitrogen and nitrate nitrogen.

[0025] Step 5: The effluent from the algae-bacteria symbiotic wind screen ecosystem is sterilized and disinfected by a medium-pressure ultraviolet sterilizer and then reused in the breeding pond.

[0026] The beneficial effects of the present invention are as follows: the inland factory-scale seawater aquaculture tailwater treatment and reuse system cleverly utilizes sedimentation tanks, aerated biological filters, a three-stage anaerobic fermentation tank, and an algae-bacteria symbiotic wind screen ecosystem to effectively remove the large amounts of ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen present in the aquaculture tailwater, thereby achieving the goal of aquaculture tailwater treatment and reuse. In addition, inland seawater aquaculture currently generally uses sea salt to prepare simulated seawater. Conventional factory-scale aquaculture tailwater treatment systems require 5%-10% of prepared seawater daily. However, the system's full tailwater recycling can significantly reduce seawater preparation costs to a certain extent.

[0027] The sedimentation tank and three-stage anaerobic fermentation tank of the present invention can separate solid particles or suspended matter such as leftover bait, fish and shrimp excrement in the aquaculture tail water, and undergo anaerobic fermentation treatment, effectively reducing the pollutant load of subsequent treatment facilities, improving the treatment effect, and avoiding blockage of the algae-bacteria symbiotic wind screen ecosystem.

[0028] The brush filler used in the aerated biological filter of the present invention not only plays a physical interception role, but also provides a place for microorganisms to attach and grow and implement nitrification and denitrification. The generated nitrogen and phosphorus nutrients serve as nutrients for the growth and reproduction of algae in the algae-bacteria symbiotic wind screen ecosystem.

[0029] The aquaculture tailwater treatment system of the present invention adopts an algae-bacteria symbiotic wind screen ecosystem. During the biological treatment process of the algae-bacteria symbiotic system, the algae on the algae-bacteria wind screen utilize CO2 in the air and NH4 in the water through photosynthesis. + 、NO3 - PO4 3- The autotrophic nitrifying bacteria on the algae-bacteria wind screen can synthesize their own cell substances and realize NH4 + Converted to NO2 - , and NO2 - Converted to NO3 -The autotrophic nitrifying and denitrifying bacteria in the lower biofilter area and K5 filler area use algae metabolites as a carbon source to further nitrify and denitrify nitrogen compounds in the water, producing CO2 and releasing extracellular secretions, thereby achieving efficient aquaculture tailwater treatment without adding a carbon source. In addition, the collection tank of this ecosystem has a two-stage biological treatment. The first stage performs simultaneous nitrification and denitrification to remove ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen from the tailwater, while the second stage performs anaerobic denitrification to further enhance the removal of nitrite and nitrate. The effluent of the algae-bacteria symbiotic wind screen ecosystem contains a large amount of microalgae, which are recycled into the aquaculture ponds and become edible bait for aquatic products, thereby reducing the daily feed dosage and thus reducing aquaculture costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of an inland factory-scale seawater aquaculture tailwater treatment and reuse system of the present invention;

[0031] Figure 2 for Figure 1 Top view of the intermediate sedimentation tank, biological aerated filter and tertiary anaerobic fermentation tank;

[0032] Figure 3 for Figure 1 Side view of the middle three-stage anaerobic fermentation tank;

[0033] Figure 4 for Figure 1 A top view of the collection pool of the algae-bacteria symbiotic wind screen ecosystem;

[0034] Figure 5 for Figure 1 Schematic diagram of the water inlet pipe of the algae-bacteria symbiotic wind screen ecosystem;

[0035] Figure 1: 1. Sedimentation tank; 2. Aerated biological filter; 3. Three-stage anaerobic fermentation tank; 4. Algae-bacteria symbiotic wind screen ecosystem; 5. Medium-pressure UV sterilizer; 6. First pipeline; 7. Sludge lifting pump; 8. Second pipeline; 11. Mud accumulation area; 12. Sedimentation area; 13. Truss scraper; 21. Overflow trough; 22. Brush-type biofilm; 23. Aeration pipeline; 31. First anaerobic zone; 32. Second anaerobic zone; 33. Clarification zone; 3 4. Partition plate; 35. Pipe opening 1; 36. Pipe opening 2; 41. First collecting tank; 42. Second collecting tank; 43. First spray element; 44. Second spray element; 45. Algae-bacteria wind screen biofilm; 46. Biofilter bed; 55. First biofilter bed; 56. Second biofilter bed; 47. Aeration pipe; 48. K5 filler; 49. First water inlet pipe; 50. Second water inlet pipe; 51, 52, 53, 54. Lifting pump. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Example 1

[0038] like Figure 1-5 As shown, the inland factory-scale seawater aquaculture tailwater treatment and reuse system of the present invention includes a sedimentation tank 1, an aerated biological filter 2, a three-stage anaerobic fermentation tank 3, an algae-bacteria symbiotic wind screen ecosystem 4, a medium-pressure ultraviolet disinfector 5, and several lifting pumps and pipelines;

[0039] like Figure 2 As shown, the sedimentation tank 1 consists of a sludge accumulation area 11 and a sedimentation area 12. The sludge accumulation area 11 is a rectangular funnel structure with a bottom length-width-height ratio of 2:2:1.73 and a bottom slope of 60°. The bottom slope of the sedimentation area 12 is set to 3°. A truss scraper 13 is used to scrape the sludge in the sedimentation area 12 into the sludge accumulation funnel.

[0040] The aerated biological filter 2 is arranged at the outlet of the sedimentation tank 1. The tail water flows into the aerated biological filter 2 through the overflow trough 21. A brush-type biofilm 22 is used as a suspended filter material and microbial carrier. The brush-type biofilm 22 is evenly arranged at intervals of 10 cm. The brush diameter is 12 cm and the length is 90 cm. Aeration pipes 23 are evenly arranged at the bottom.

[0041] The sludge in the sedimentation tank sludge area 11 is pumped into the third-stage anaerobic fermentation tank 3 through the second pipeline 8 by the sludge lifting pump 7; Figure 3 As shown, the three-stage anaerobic fermentation tank 3 consists of a primary anaerobic zone 31, a secondary anaerobic zone 32, and a clarification zone 33. Two vertical partition plates 34 are provided in the tank body to separate the three compartments. Each partition plate 34 is provided with a pipe opening. The first pipe opening 35 is located lower than the second pipe opening 36. The capacity of the primary anaerobic zone 31 is larger than that of the secondary anaerobic zone 32 and smaller than that of the clarification zone 33.

[0042] The aerated biological filter 2 and the three-stage anaerobic fermentation tank 3 are connected to the algae-bacteria symbiotic wind screen ecosystem 4 through a first pipeline 6;

[0043] The algae-bacteria symbiotic wind screen ecosystem 4 includes a collection device, a spray device, a circulation device and a purification device; the collection device is composed of a first collection pool 41 and a second collection pool 42. The first collection pool 41 is provided with lift pumps 51 and 52, and the second collection pool 42 is provided with lift pumps 53 and 54. The algae-bacteria symbiotic wind screen ecosystem 4 is provided with a first water inlet pipe 49 connected to the first pipe 6, and a second water inlet pipe 50 is provided to connect to the lift pump 52 in the first collection pool 41. Figure 5 As shown, the outlet ends of the first water inlet pipe 49 and the second water inlet pipe 50 are T-shaped structures, and a plurality of drainage holes are provided on the water pipe walls at the outlet ends.

[0044] like Figure 4 As shown, the collection device consists of a first collection tank 41 and a second collection tank 42. Aeration pipes 47 are evenly arranged at the bottom of the first collection tank 41 for intermittent aeration. The dissolved oxygen content in the first collection tank 41 is controlled between 0.2-0.8 mg / L to promote the simultaneous nitrification and denitrification reaction of the wastewater. At the same time, K5 filler 48 is added to the first collection tank 41 to promote the attachment and growth of nitrifying bacteria and denitrifying bacteria. The filling amount is 12 kg / m 3 .

[0045] The spray device is composed of a first spray element 43 and a second spray element 44. The input end of the first spray element 43 is connected to the first collection tank 41 through a lifting pump 51, and the input end of the second spray element 44 is connected to the second collection tank 42 through a lifting pump 53.

[0046] The circulation device is composed of a lift pump 51 and a lift pump 52 of the first collection tank 41, and a lift pump 53 and a lift pump 54 of the second collection tank 42. The lift pump 51 and the lift pump 53 are respectively connected to the first spray element 43 and the second spray element 44, and the lift pump 52 is connected to the second water inlet pipe 50.

[0047] The purification device is composed of an algae-bacteria wind screen biofilm 45 and a biofilter bed 46. The algae-bacteria wind screen biofilm 45 is 5 m high and 2 mm thick. There are multiple algae-bacteria wind screen biofilms 45, which are arranged vertically side by side at intervals of 0.15 m. The algae-bacteria wind screen biofilms 45 perform biochemical treatment on the tail water and drain the tail water to the biofilter bed 46.

[0048] Biofilter 46 consists of a first biofilter 55 and a second biofilter 56. The filter media of first biofilter 55 consists of crushed straw and rice husks, with a particle size of 0.5-1 cm and a thickness of 25 cm. The filter media of second biofilter 56 consists of ceramsite and gravel, with a particle size of 1.0-1.5 cm and a particle size of 0.3-0.6 cm, respectively, and a thickness of 15 cm. Biofilter 46 filters and biochemically treats the tailwater, which then flows into first collection tank 41 and second collection tank 42.

[0049] The medium-pressure ultraviolet sterilizer 5 is connected to the lifting pump 54 in the second collection tank 42 in the algae-bacteria symbiotic wind screen ecosystem 4, and the effluent of the algae-bacteria symbiotic wind screen ecosystem 4 is sterilized by ultraviolet and then reused in the breeding pond.

[0050] The operation of an inland industrialized seawater aquaculture tailwater treatment and reuse system includes the following steps:

[0051] Step 1: Factory aquaculture wastewater enters the sedimentation tank 1, where it undergoes natural sedimentation to achieve solid-liquid separation, removing suspended solids such as leftover bait, excrement, and residual organic debris from aquatic products. The precipitated sludge is scraped by a truss scraper 13 and sent to a sludge hopper.

[0052] Step 2: The effluent from the sedimentation tank 1 enters the aerated biological filter 2, where the brush-type biofilm 22 further intercepts fine suspended solids. At the same time, attached microorganisms undergo biochemical reactions to convert organic matter in the wastewater into nitrogen and phosphorus nutrients.

[0053] Step 3: The sludge from the sedimentation tank 1 enters the third-stage anaerobic fermentation tank 3 through the sludge lifting pump 7 to achieve the functions of intercepting solid sludge, anaerobic fermentation and removing pathogenic microorganisms such as insect eggs;

[0054] Step 4: The effluent from the aerated biological filter 2 and the tertiary anaerobic fermentation tank 3 enters the algae-bacteria symbiotic wind screen ecosystem 4 through the first pipeline 6 for two-stage biological treatment. In the primary treatment, the algae-bacteria wind screen biofilm 45 performs aerobic nitrification and the first collection tank 41 performs anoxic simultaneous nitrification and denitrification to remove ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen. In the secondary treatment, the algae-bacteria wind screen biofilm 45 performs aerobic nitrification and the second collection tank 42 performs anaerobic denitrification to further enhance the removal of nitrite nitrogen and nitrate nitrogen.

[0055] Step 5: The effluent from the algae-bacteria symbiotic wind screen ecosystem 4 is sterilized and disinfected by the medium-pressure ultraviolet sterilizer 5 and then reused in the breeding pond.

Claims

1. An inland industrialized seawater aquaculture tailwater treatment and reuse system, characterized by: It includes a sedimentation tank (1), an aerated biological filter (2), a three-stage anaerobic fermentation tank (3), an algae-bacteria symbiotic wind screen ecosystem (4), a medium-pressure ultraviolet disinfector (5), and several lifting pumps and pipelines; The sedimentation tank is composed of a sludge accumulation area (11) and a sedimentation area (12), both of which are provided with slopes. The sludge accumulation area (11) is a funnel structure, and a truss-type scraper (13) is provided in the sludge accumulation area (11) to scrape the sludge in the sedimentation area (12) into the sludge accumulation funnel. The aerated biological filter (2) is arranged at the outlet of the sedimentation tank (1), and the tail water flows into the aerated biological filter (2) through the overflow trough (21). A brush-type biofilm (22) is provided as a suspended filter material and microbial carrier, and an aeration pipe (23) is evenly arranged at the bottom; A second pipe (8) is provided at the bottom of the sedimentation tank sludge accumulation area (11) and connected to the inlet of the sludge lifting pump (7), and the outlet of the sludge lifting pump (7) is connected to the three-stage anaerobic fermentation tank (3), wherein the three-stage anaerobic fermentation tank (3) is composed of a primary anaerobic zone (31), a secondary anaerobic zone (32) and a clarification zone (33); The aerated biological filter (2) and the three-stage anaerobic fermentation tank (3) are connected to the algae-bacteria symbiotic wind screen ecosystem (4) via a first pipeline (6); The algae-bacteria symbiotic wind screen ecosystem (4) includes a collecting device, a spraying device, a circulation device and a purification device; the collecting device is composed of a first collecting pool (41) and a second collecting pool (42); the spraying device is composed of a first spraying member (43) and a second spraying member (44), the input end of the first spraying member (43) is connected to the first collecting pool (41), and the second spraying member (44) is connected to the second collecting pool (42); the circulation device is composed of a lifting pump (51) and a lifting pump (52) of the first collecting pool (41) and a lifting pump (53) and a lifting pump (54) of the second collecting pool (42); the purification device is composed of an algae-bacteria wind screen biofilm (45) and a biological filter bed (46), the number of the algae-bacteria wind screen biofilm (45) is multiple, and they are arranged vertically side by side at intervals, and the biological filter bed (46) is arranged between the algae-bacteria wind screen biofilm (45) and the first collecting pool (41) and the second collecting pool (42); The inlet end of the medium-pressure ultraviolet sterilizer (5) is connected to the water outlet lift pump (54) in the second collection tank (42) in the algae-bacteria symbiotic wind screen ecosystem (4), and the outlet end is connected to the culture pond; Two vertical partition plates (34) are provided in the body of the three-stage anaerobic fermentation tank (3) to separate the three compartments. The partition plates (34) are all provided with pipe openings. The position of the first pipe opening (35) on the partition plate between the primary anaerobic zone (31) and the secondary anaerobic zone (32) is lower than the position of the second pipe opening (36) on the partition plate between the secondary anaerobic zone (32) and the clarification zone (33). The capacity of the primary anaerobic zone (31) is greater than that of the secondary anaerobic zone (32) and smaller than that of the clarification zone (33).

2. The inland industrialized seawater aquaculture tailwater treatment and reuse system according to claim 1, characterized in that: The mud accumulation area (11) is a rectangular funnel structure, the length, width and height ratio of the bottom of the funnel is 2:2:1.73, the bottom slope is set to 60°, and the bottom slope of the sedimentation area (12) is set to 3°.

3. The inland industrialized seawater aquaculture tailwater treatment and reuse system according to claim 1, characterized in that: The brush-type biofilm (22) of the aerated biological filter (2) is evenly distributed at intervals of 10 cm, and the brush diameter is 10-18 cm and the length is 50-150 cm.

4. The inland industrialized seawater aquaculture tailwater treatment and reuse system according to claim 1, characterized in that: The output ends of the first spraying member (43) and the second spraying member (44) of the algae-bacteria symbiotic wind screen ecosystem (4) are a plurality of evenly distributed spraying heads, which are located above the algae-bacteria wind screen biofilm (45) and are used to spray wastewater onto each wind screen biofilm (45).

5. The inland industrialized seawater aquaculture tailwater treatment and reuse system according to claim 1, characterized in that: The biological filter bed (46) is composed of a first biological filter bed (55) and a second biological filter bed (56); the filter material of the first biological filter bed (55) is straw crushing material and rice husk, the particle size of the straw crushing material is 0.5-1 cm, and the filter material is laid with a thickness of 20-30 cm; the filter material of the second biological filter bed (56) is ceramsite and gravel, the particle size of the ceramsite is 1.0-1.5 cm, the particle size of the gravel is 0.3-0.6 cm, and the filter material is laid with a thickness of 10-15 cm.

6. The inland industrialized seawater aquaculture tailwater treatment and reuse system according to claim 1, characterized in that: The algae-bacteria wind screen biofilm (45) is 5 m high and 2 mm thick.

7. The inland industrialized seawater aquaculture tailwater treatment and reuse system according to claim 1, characterized in that: Aeration pipes (47) are evenly arranged at the bottom of the first collection tank (41) of the algae-bacteria symbiotic wind screen ecosystem (4) for intermittent aeration, and the dissolved oxygen content in the first collection tank is controlled between 0.2-0.8 mg / L to promote the simultaneous nitrification and denitrification reaction of the wastewater; K5 filler is added to the first collection tank (41) to promote the attachment and growth of nitrifying bacteria and denitrifying bacteria, and the filling amount is 12 kg / m 3 .

8. The inland industrialized seawater aquaculture tailwater treatment and reuse system according to claim 1, characterized in that: The algae-bacteria symbiotic wind screen ecosystem (4) is provided with a first water inlet pipe (49) connected to the first pipeline (6), and a second water inlet pipe (50) is provided to be connected to the lifting pump (52) in the first collection tank (41); the outlet ends of the first water inlet pipe (49) and the second water inlet pipe (50) are T-shaped structures, and a plurality of circular drainage holes with a hole diameter of 0.15-0.4 cm are provided on the water pipe wall of the water outlet end.

9. A method for treating and reusing tail water from industrial aquaculture, using the tail water treatment and reuse system according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Factory aquaculture wastewater enters the sedimentation tank (1), where solid-liquid separation is achieved through natural sedimentation, and suspended solids such as leftover bait, excrement, and residual organic debris from aquatic products in the aquaculture wastewater are removed. The precipitated sludge is scraped into the sludge hopper by a truss scraper (13); Step 2: The effluent from the sedimentation tank (1) enters the aerated biological filter (2), where the brush-type biofilm (22) further intercepts fine suspended solids and attaches microorganisms to carry out biochemical reactions to convert organic matter in the wastewater into nitrogen and phosphorus nutrients; Step 3: The sludge from the sedimentation tank (1) enters the third-stage anaerobic fermentation tank (3) through the sludge lifting pump (7), achieving the functions of intercepting solid sludge, anaerobic fermentation and removing pathogenic microorganisms such as insect eggs; Step 4: The effluent from the aerated biological filter (2) and the three-stage anaerobic fermentation tank (3) enters the algae-bacteria symbiotic wind screen ecosystem (4) through the first pipe (6) for two-stage biological treatment. In the first treatment, the algae-bacteria wind screen biofilm (45) performs aerobic nitrification and the first collection tank (41) performs anoxic synchronous nitrification and denitrification to remove ammonia nitrogen, nitrite nitrogen and nitrate nitrogen. In the second treatment, the algae-bacteria wind screen biofilm (45) performs aerobic nitrification and the second collection tank (42) performs anaerobic denitrification to further enhance the removal effect of nitrite nitrogen and nitrate nitrogen. Step 5: The effluent from the algae-bacteria symbiotic wind screen ecosystem (4) is sterilized and disinfected by a medium-pressure ultraviolet sterilizer (5) and then reused in the aquaculture pond.

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