High-place pond culture circulating water purification facility and method

Abstract

The invention provides a device and a method for purifying culture circulating water in a higher-place pond, and the method specifically comprises the following steps: the culture circulating water and residual feed and excrement in the higher-place pond flow out from a sewage draining exit at the center of the pond bottom, and gradually flow into a self-settling filter well through a water inlet at the bottom of the well; aquaculture circulating water is filtered by an immersion filtering device in the well and overflows out of the well, and residual feed and excrement settle to the bottom of the well and then are discharged through a shrimp shell excrement drain outlet; the breeding circulating water overflowing out of the well flows through a hypochlorous acid oxidation device to be disinfected; the culture circulating water treated by the hypochlorous acid oxidation device flows into an aeration dechlorination tank to remove harmful gas; the culture circulating water treated by the aeration dechlorination tank flows into the ecological tank, so that the contents of carbon, nitrogen, phosphorus and the like in the water are reduced; and the culture circulating water treated by the ecological pond is pumped into the higher-place pond through a reflux pump. The system is efficient, energy-saving, small in occupied area, high in automation degree and capable of improving the water quality management efficiency and stability of higher-place pond culture circulating water.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water quality purification of aquaculture, and particularly relates to a high-tank aquaculture circulating water purification facility and method. BACKGROUND

[0002] With the development of aquaculture industry towards intensification and industrialization, the circulating water aquaculture system is widely used due to its advantages of land saving, water saving, and environmental friendliness. As a common intensive aquaculture mode, the core of high-tank aquaculture is to maintain the stability of water quality in the tank through efficient purification and recycling of aquaculture water to ensure the healthy growth of aquatic organisms.

[0003] In the existing high-tank aquaculture circulating water treatment technology, there are generally problems such as insufficient solid-liquid separation efficiency and anti-clogging ability, safety risks or short-term effect of disinfection process, and incomplete removal of nutrients, most of which have large occupied area, long construction period, high cost, and are not energy-saving.

[0004] Therefore, there is an urgent need for a high-efficiency and energy-saving high-tank aquaculture circulating water purification method and facility that integrates physical filtration, safe disinfection, and deep nitrogen and phosphorus removal.

[0005] Based on this, a high-tank aquaculture circulating water purification facility and method are proposed. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a high-tank aquaculture circulating water purification facility and method to solve the problems raised in the background art in view of the deficiencies of the prior art.

[0007] To solve the above technical problems, the technical solution adopted by the present application is as follows: In a first aspect, a high-tank aquaculture circulating water purification facility includes a high tank, a self-settling filter well, a chloric acid oxidation device, an aeration dechlorination tank, and an ecological tank, wherein the central sewage outlet of the high tank is connected to one side of the bottom of the self-settling filter well through a bottom sewage pipe, and the other side of the bottom of the self-settling filter well is connected to a shrimp shell feces sewage outlet through a sewage pipe; The top of the self-settling filter well is connected to the hypochlorous acid oxidation device, the hypochlorous acid oxidation device is connected to the backwashing pump through the pipeline, and the backwashing pump is connected to the aeration dechlorination tank; The aeration dechlorination tank is connected to the ecological tank, the ecological tank is connected to the backflow pump through the pipeline, and the backflow pump is connected to the water inlet of the high tank; The high tank, self-settling filter well, hypochlorous acid oxidation device, backwashing pump, aeration dechlorination tank, ecological tank, and backflow pump constitute a circulating water purification system.

[0008] As a further illustration of the present application, the high-level pool is square-shaped, and the bottom of the high-level pool is pot-shaped, and a central sewage outlet is arranged in the middle of the bottom of the high-level pool.

[0009] As a further illustration of the present application, a control valve is arranged on the sewage pipeline, and the control valve is used to adjust the opening and closing of the shrimp shell feces sewage outlet.

[0010] As a further illustration of the present application, the self-sedimentation filter well is provided with an immersed filter device, and the immersed filter device is a multi-layer microfilter device or a cylindrical microfilter device.

[0011] As a further illustration of the present application, the multi-layer microfilter device is composed of multi-layer microfilter screens, and the aquaculture circulating water is filtered from bottom to top through the multi-layer microfilter screens, and the particulate matters are intercepted below the microfilter screens.

[0012] As a further illustration of the present application, the cylindrical microfilter device is composed of cylindrical microfilter screens, and the aquaculture circulating water is filtered from outside to inside through the microfilter screens, and the particulate matters are intercepted outside the cylindrical microfilter screens.

[0013] As a further illustration of the present application, algae or aquatic plants are cultivated in the ecological pool.

[0014] In the second aspect, a high-level pool aquaculture circulating water purification method comprises the following steps: S1, the aquaculture circulating water and the leftover feed feces in the high-level pool flow out from the central sewage outlet in the bottom of the pool, and gradually flow into the self-sedimentation filter well through the well bottom water inlet; S2, in the self-sedimentation filter well, the aquaculture circulating water is filtered by the immersed filter device in the well, and then overflows out of the well, and the leftover feed feces is settled at the bottom of the self-sedimentation filter well, and then is discharged through the shrimp shell feces sewage outlet after the control valve of the sewage pipeline is opened, and is collected and treated; S3, the aquaculture circulating water overflowing out of the well flows through the hypochlorous acid oxidation device for disinfection treatment, and then flows into the aeration dechlorination pool to remove residual chlorine and other harmful gases; S4, the aquaculture circulating water treated by the aeration dechlorination pool flows into the ecological pool to reduce the content of carbon, nitrogen, phosphorus and the like in the water; S5, the aquaculture circulating water treated by the ecological pool is pumped into the high-level pool by the backflow pump.

[0015] As a further illustration of the present application, the aquaculture circulating water treated by the hypochlorous acid oxidation device enters the backwashing pump, and the backwashing pump periodically backwashes the pipeline and the immersed filter device to prevent blockage.

[0016] As a further illustration of the present application, the ammonia nitrogen and nitrite concentration in the aquaculture circulating water treated by the aeration dechlorination tank needs to be monitored in real time, and the aquaculture circulating water is flowed into the ecological tank after monitoring up to standard, the ammonia nitrogen and nitrite concentration in the aquaculture circulating water treated by the ecological tank needs to be monitored in real time, and the aquaculture circulating water is flowed back into the high-level tank after monitoring up to standard.

[0017] Compared with the prior art, the present application has the following advantages: The present application preliminarily settles the large-particle pollutants such as residual bait and feces by setting the self-settling filter well, and softly filters under the action of gravity and water level difference by using the principle of communicating vessels, without other power, and can effectively prevent filter screen from being blocked by combining with regular backwashing, thereby reducing the cleaning frequency and maintenance intensity of the equipment, and having energy-saving and environmental protection effects.

[0018] The present application has safety and stability by killing bacteria and disinfecting through the hypochlorous acid oxidation device, and eliminating the damage of residual chlorine to the breeding organisms by setting the aeration dechlorination tank.

[0019] The present application has high-efficiency water purification efficiency by setting the ecological tank, and using the absorption, assimilation and biochemical degradation of algae or aquatic plants and attached microorganisms to deeply and continuously remove the nutrient salts such as ammonia nitrogen and nitrite in the water body.

[0020] The present application collects concentrated feces through the shrimp shell fecal sewage discharge port to facilitate centralized treatment and resource utilization, which meets the environmental protection requirements; and realizes automatic operation through the control valve, backwashing pump and reflux pump, thereby reducing the operation cost.

[0021] The present application purifies the aquaculture circulating water through the high-level tank aquaculture circulating water purification system, saves water resources, reduces operation energy consumption, has the advantages of high efficiency, stability, safety and energy saving, thereby effectively solving the problems of insufficient purification efficiency and high operation cost of the high-level tank aquaculture circulating water purification system. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a high-level tank aquaculture circulating water purification facility schematic diagram in the embodiment one of the present application; Figure 2 It is another view schematic diagram of the high-level tank aquaculture circulating water purification facility in the embodiment one of the present application.

[0023] Figure 3 It is a multi-layer microfiltration device structure section view schematic diagram in the self-settling filter well in the embodiment one of the present application; Figure 4 It is a cylindrical microfiltration device structure section view schematic diagram in the self-settling filter well in the embodiment one of the present application; Figure 5 It is a high-level tank aquaculture circulating water purification facility schematic diagram in the embodiment two of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS 1-High-level tank; 11-Central sewage outlet; 12-Inlet; 2-Sedimentation filter well; 21-Well bottom inlet; 22-Shrimp shell and feces discharge outlet; 23-Multi-layer microfiltration device; 24-Cylindrical microfiltration device; 3-Control valve; 4-Hypochlorous acid oxidation device; 5-Backwash pump; 6-Aeration dechlorination tank; 7-Ecological tank; 8-Recirculation pump. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Example 1, as Figures 1-4 As shown, the present invention provides a technical solution: a high-level aquaculture circulating water purification facility, comprising a high-level pond 1, a self-settling filter well 2, a chloric acid oxidation device 4, an aeration dechlorination pond 6, and an ecological pond 7. The elevated pool 1 is square in shape, and its bottom is shaped like a pot. A central sewage outlet 11 is located in the middle of the bottom of the elevated pool 1. The water level of the elevated pool 1 above the ground is the same as that of the aeration dechlorination pool 6 and the ecological pool 7, and is always higher than the water level of the self-settling filter well 2. This allows the aquaculture circulating water to directly enter the self-settling filter well 2 from the central sewage outlet 11 for filtration under the effect of the water level difference. Then, the overflow well flows sequentially through the hypochlorous acid oxidation device 4, the aeration dechlorination pool 6, and the ecological pool 7. Therefore, sewage discharge and water pumping can be carried out without energy consumption, thus significantly reducing operating costs.

[0027] The central sewage outlet 11 of the high-level pool 1 is connected to one side of the bottom of the self-settling filter well 2 through a bottom sewage pipe, and the other side of the bottom of the self-settling filter well 2 is connected to the shrimp shell and feces sewage outlet through a sewage pipe. The top of the self-settling filter well 2 is connected to the hypochlorous acid oxidation device 4, and the hypochlorous acid oxidation device 4 is connected to the backwash pump 5 through a pipeline. The backwash pump 5 is connected to the aeration dechlorination tank 6. The aeration dechlorination tank 6 is connected to the ecological tank 7, and the ecological tank 7 is connected to the return pump 8 through a pipeline. The return pump 8 is connected to the inlet 12 of the high-level tank 1. The high pool 1, the self-settling filter well 2, the hypochlorous acid oxidation device 4, the backwashing pump 5, the aeration dechlorination pool 6, the ecological pool 7 and the backflow pump 8 constitute a circulating water purification system, and the whole set of facilities system occupies an area of about 2%-4% of the area of the breeding pool, which can increase the breeding density by 20%-30%.

[0028] The control valve 3 is arranged on the sewage pipeline, and is used to adjust the opening and closing of the shrimp shell and fecal sewage discharge outlet. Under the action of the water level difference, the breeding circulating water flows from the water inlet 12 into the self-settling filter well 2 from bottom to top, and the circulating water is filtered through the immersed filter device. The residual feed and feces and other particulate impurities are intercepted outside the filter device, and the filtered circulating water flows out of the well from the upper part of the well and enters the hypochlorous acid oxidation device 4 through the water outlet pipeline. Under the action of gravity, the residual feed and feces and other particulate impurities gradually settle to the bottom of the well, and the control valve 3 is opened regularly to discharge the precipitated impurities through the shrimp shell and fecal sewage discharge outlet 22 for centralized collection and treatment.

[0029] The self-settling filter well 2 is provided with an immersed filter device, and the immersed filter device is a multi-layer microfilter device 23 or a cylindrical microfilter device 24.

[0030] The multi-layer microfilter device 23 is composed of a plurality of multi-layer microfilter screens, and the breeding circulating water flows from bottom to top through the multi-layer microfilter screens for filtration, and the particulate matters are intercepted below the microfilter screens.

[0031] The cylindrical microfilter device 24 is composed of a cylindrical microfilter screen, and the breeding circulating water flows from outside to inside through the microfilter screen for filtration, and the particulate matters are intercepted outside the cylindrical microfilter screen.

[0032] The ecological pool 7 cultivates algae or plants aquatic plants, and uses the absorption, assimilation and biochemical degradation of the algae or aquatic plants and the attached microorganisms to deeply and continuously remove the nutrients such as ammonia nitrogen and nitrite in the water body, and has high water purification efficiency.

[0033] The purification method of the above-mentioned high pool breeding circulating water purification facility comprises the following steps: S1, the breeding circulating water and residual feed and feces in the high pool 1 flow out from the central sewage outlet 11 at the bottom of the pool, and gradually flow into the self-settling filter well 2 through the well bottom water inlet 21; The high pool 1 occupies an area of about 2-5 mu, and the breeding circulating water and residual feed and feces in the pool are directly discharged from the central sewage outlet 11 at the bottom of the pool and flow into the sewage pipeline under the action of gravity. The daily water discharge is about 10%-20% of the total water volume of the high pool, which is transported to the self-settling filter well 2 through the well bottom water inlet 21. Here, the gravity flow transportation does not require external power equipment, which reduces the system energy consumption and operation cost; the daily quantitative water discharge effectively controls the accumulation of pollutants in the high pool, and improves the breeding efficiency.

[0034] S2, in the self-sedimentation filter well 2, the breeding circulating water is filtered by the submerged filter device in the well, and overflowed out of the well, and the residual bait and feces are settled at the bottom of the self-sedimentation filter well 2, and after the control valve 3 of the sewage pipe is opened, the shrimp shell and feces are discharged through the shrimp shell and feces discharge port 22 for centralized collection and treatment; The diameter of the self-sedimentation filter well 2 is 1-1.5 meters, and the breeding circulating water fills the self-sedimentation filter well 2 from bottom to top by utilizing the water level difference, is filtered through the submerged filter device, and the residual bait, feces and other particulate impurities are intercepted outside the filter device, the filtered circulating water overflows out of the well from the upper part of the well, and by utilizing the gravity, the residual bait, feces and other particulate impurities gradually self-sediment to the bottom of the well, and by adopting the way of intermittent and quantitative discharge of high-concentration substrate, the control valve 3 is opened regularly according to the need every day, so that the precipitated impurities are discharged through the shrimp shell and feces discharge port 22 for centralized collection, and the secondary utilization is realized, the daily filtered water volume is 10%-20% of the total breeding water volume, and the daily bottom sewage discharge volume is about 5% of the daily circulating water volume. By utilizing the principle of communicating vessel, the solid-liquid separation and filtration and gravity self-sedimentation are completed under the action of the water level difference, and no external power equipment is needed, so that the energy saving and environmental protection are realized; the intermittent and quantitative discharge reduces the sewage discharge frequency and operation strength, and saves the water resources; the concentrated residual bait and feces can be used for secondary utilization, waste resources are realized, and the environment is friendly.

[0035] S3, the breeding circulating water overflowing out of the well flows through the hypochlorous acid oxidation device 4 for disinfection treatment, and then flows into the aeration dechlorination tank 6 to remove residual chlorine and other harmful gases; In this step, the breeding circulating water filtered in the self-sedimentation filter well overflows out of the well under the action of the water level difference, and is disinfected through the hypochlorous acid oxidation device 4 through the water pipeline. The concentration of hypochlorous acid should be controlled within a reasonable range, and cannot be excessive, and the purpose is to reduce the influence of residual chlorine. In this link, the hypochlorous acid oxidation disinfection is introduced immediately after filtration, and the concentration of hypochlorous acid is accurately controlled, so that the problem of excessive residual chlorine in the traditional disinfection mode can be avoided, the negative influence on the subsequent biological treatment link is reduced, and the water quality reliability is improved; After being treated by the hypochlorous acid oxidation device 4, the breeding circulating water, a small amount of circulating water is extracted by the backwashing pump, flows through the water pipeline to backwash the self-sedimentation filter well, removes the impurities intercepted on the filter screen of the submerged filter device, so that the filtering capacity is restored, and the backwashing sewage and impurities are discharged through the shrimp shell and feces discharge port 22; the rest of the circulating water flows into the aeration dechlorination tank 6 through the water pipeline, and the residence treatment time is about 30 minutes, the ammonia nitrogen and nitrite concentration in the water after dechlorination are monitored, and the control is within the standard range. Regular backwashing prevents the device from being blocked, ensures the continuous and efficient operation of the device, the aeration dechlorination link effectively removes residual chlorine and harmful gases, and the water quality parameters are monitored to ensure the treatment effect, which creates favorable conditions for the subsequent ecological pool treatment; S4, the breeding circulating water treated by the aeration dechlorination tank 6 flows into the ecological pool 7 to reduce the content of carbon, nitrogen, phosphorus and the like in the water; The circulating water treated by the aeration dechlorination tank 6 is pumped into the ecological tank 7 through a water inlet 12 after the ammonia nitrogen and nitrite concentration reaches the standard, and stays for about 1 hour. The ecological tank is provided with algae, aquatic plants, microorganisms and the like, and the content of carbon, nitrogen and phosphorus in the water is further reduced through the symbiotic effect of bacteria and algae and the purification effect of aquatic plants. The algae and aquatic plants in the tank can be regularly salvaged and collected for centralized treatment, thereby generating certain economic benefits. The ammonia nitrogen and nitrite concentration in the water treated by the ecological tank is monitored and controlled within the standard range, so as to reach the reuse standard. The subsequent treatment by the ecological tank has good treatment effect and low operation cost. The algae and aquatic plants can be regularly harvested and used for producing feed or energy, thereby creating certain economic benefits. The continuous monitoring of the effluent quality ensures that the recirculated water quality reaches the standard, and the sustainable recycling of water resources is realized.

[0036] S5, the aquaculture circulating water treated by the ecological tank 7 is pumped into the high-level tank 1 by a recirculation pump 8.

[0037] The aquaculture circulating water treated by the ecological tank 7 is pumped into the high-level tank 1 by the recirculation pump after the ammonia nitrogen and nitrite concentration reaches the standard. The recirculation rate of the recirculation pump is 50-80 m 3 / h, and the daily recirculation water volume is 10%-20% of the total aquaculture water volume. The recirculation rate of the recirculation pump is accurately controlled to maintain the dynamic balance of the water quality in the high-level tank, thereby greatly reducing the fresh water consumption and wastewater discharge and improving the stability and production efficiency of the aquaculture system.

[0038] As a preferred embodiment in the present embodiment, the aquaculture circulating water treated by the hypochlorous acid oxidation device 4 is pumped into the backwashing pump 5, and the backwashing pump 5 periodically backwashes the pipeline and the immersed filter device to prevent clogging.

[0039] As a preferred embodiment in the present embodiment, the ammonia nitrogen and nitrite concentration in the aquaculture circulating water treated by the aeration dechlorination tank 6 needs to be monitored in real time, and the water flows into the ecological tank 7 after the monitoring reaches the standard. The ammonia nitrogen and nitrite concentration in the aquaculture circulating water treated by the ecological tank 7 needs to be monitored in real time, and the water is recirculated into the high-level tank 1 after the monitoring reaches the standard.

[0040] Example two, refer to Figure 5The difference between the embodiment and the above-mentioned embodiment one is that four well bottom water inlets 21 are connected to the outer bottom of the self-settling filter well 2, and the self-settling filter well 2 is connected to two water conveying channels at the outer top, and the filtered circulating aquaculture water is conveyed to two water conveying pipes, and then is sterilized by the hypochlorous acid oxidation device 4, and then is sequentially conveyed through the parallel two-side backwashing pumps 5, the aeration dechlorination device 6, the ecological pool 7, the backflow pump 8 and other water treatment facilities, and then is backflowed to the four high-level pools 1 through the water inlets 12. The embodiment can realize the purification of the circulating water of multiple high-level pools, has the same effect as the above-mentioned embodiment one, and is more energy-saving and efficient.

[0041] It should be further explained that the drawings and embodiments of the present application mainly describe the concept of the present application, and on the basis of the concept, the specific forms and settings of some connection relationships, position relationships, power mechanisms, power supply systems, hydraulic systems and control systems are not completely described, but the skilled in the art can realize the specific forms and settings by using the well-known ways on the premise of understanding the concept of the present application.

[0042] When an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] The terms "inner", "outer", "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "vertical", "horizontal", "top", "bottom", "lateral", "medial", and derivatives thereof (e.g., "vertical ly", "horizontally", etc.) can refer to the relative positions on, or orientations of, an apparatus, as shown in the figures, and are used for convenience to describe the present application and are in no way a limitation on the scope of the application. These terms can include different orientations of the device or apparatus in use or operation, in which case it will be understood that the terms specifically refer to an orientation as described herein.

[0045] The terms "first", "second", and the like, do not imply either chronological or

[0046] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is also possible in the present application that units related to different processing steps can also be used in combination to achieve the processes described herein. Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this application belongs. It will be appreciated that certain features of the application, which alone or in various combinations, can be applied to other embodiments of the application, and vice versa to the fullest extent permitted by the prior art.

[0047] While the embodiments of the application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A high-level pond aquaculture circulating water purification system, characterized in that: It includes a high-level pool (1), a self-settling filter well (2), a chloric acid oxidation device (4), an aeration dechlorination pool (6), and an ecological pool (7). The central sewage outlet (11) of the high-level pool (1) is connected to one side of the bottom of the self-settling filter well (2) through a bottom sewage pipe, and the other side of the bottom of the self-settling filter well (2) is connected to the shrimp shell feces sewage outlet (22) through a sewage pipe. The top of the self-settling filter well (2) is connected to the hypochlorous acid oxidation device (4), the hypochlorous acid oxidation device (4) is connected to the backwash pump (5) through a pipeline, and the backwash pump (5) is connected to the aeration dechlorination tank (6). The aeration dechlorination tank (6) is connected to the ecological tank (7), the ecological tank (7) is connected to the return pump (8) through a pipeline, and the return pump (8) is connected to the inlet (12) of the high-level tank (1). The high-level pool (1), self-settling filter well (2), hypochlorous acid oxidation device (4), backwash pump (5), aeration dechlorination pool (6), ecological pool (7) and return pump (8) constitute a circulating water purification system.

2. The high-level pond aquaculture circulating water purification facility according to claim 1, characterized in that, The high-level pool (1) is square, and the bottom of the high-level pool (1) is pot-shaped. A central sewage outlet (11) is provided in the middle of the bottom of the high-level pool (1).

3. The high-level pond aquaculture circulating water purification facility according to claim 1, characterized in that, The sewage pipe is equipped with a control valve (3), which is used to adjust the opening and closing of the shrimp shell sewage outlet (22).

4. The high-level pond aquaculture circulating water purification facility according to claim 1, characterized in that, The self-settling filter well (2) is equipped with an immersion filtration device, which is a multi-layer microfiltration device (23) or a cylindrical microfiltration device (24).

5. The high-level pond aquaculture circulating water purification facility according to claim 4, characterized in that, The multi-layer microfiltration device (23) consists of multiple microfiltration screens. The aquaculture circulating water is filtered from bottom to top through the multiple microfiltration screens, and particulate matter is trapped under the microfiltration screens.

6. The high-level pond aquaculture circulating water purification facility according to claim 4, characterized in that, The cylindrical microfiltration device (24) consists of a cylindrical microfiltration screen. The aquaculture circulating water is filtered from the outside to the inside through the microfiltration screen, and particulate matter is trapped outside the cylindrical microfiltration screen.

7. The high-level pond aquaculture circulating water purification facility according to claim 1, characterized in that, Algae or aquatic plants are cultivated in the ecological pond (7).

8. A method for purifying circulating water in elevated aquaculture ponds, characterized in that, Includes the following steps: S1. The aquaculture circulating water and uneaten feed and feces in the high-level pool (1) flow out from the central sewage outlet (11) at the bottom of the pool and gradually flow into the sedimentation filter well (2) through the water inlet (21) at the bottom of the well. S2. In the self-settling filter well (2), the aquaculture circulating water overflows out of the well through the submerged filter device in the well. The uneaten feed and feces settle to the bottom of the self-settling filter well (2). After opening the control valve (3) of the sewage pipe, it is discharged through the shrimp shell feces discharge port (22) and collected and treated in a centralized manner. S3. The aquaculture circulating water from the overflow well is disinfected by the hypochlorous acid oxidation device (4) and then flows into the aeration dechlorination tank (6) to remove residual chlorine and other harmful gases. S4. The aquaculture circulating water treated by the aeration dechlorination tank (6) flows into the ecological pond (7) to reduce the content of carbon, nitrogen, phosphorus and other substances in the water. S5. The aquaculture circulating water treated by the ecological pond (7) is pumped into the high-level pond (1) through the return pump (8).

9. The method for purifying circulating water in a high-level aquaculture pond according to claim 8, characterized in that, After being treated by the hypochlorous acid oxidation device (4), the aquaculture circulating water enters the backwash pump (5). The backwash pump (5) backwashes the pipeline and submersible filter device regularly to prevent blockage.

10. The method for purifying circulating water in a high-level aquaculture pond according to claim 8, characterized in that, The concentrations of ammonia nitrogen and nitrite in the aquaculture circulating water after treatment in the aeration dechlorination tank (6) need to be monitored in real time. After the monitoring meets the standards, the water flows into the ecological pond (7). The concentrations of ammonia nitrogen and nitrite in the aquaculture circulating water after treatment in the ecological pond (7) need to be monitored in real time. After the monitoring meets the standards, the water flows back into the high-level pond (1).

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