Integrated removal device for recirculating aquaculture system effluent pollutants

Abstract

This application provides an integrated pollutant removal device for wastewater from facility-grown fish farming, relating to the field of aquaculture technology. The integrated pollutant removal device for wastewater from facility-grown fish farming includes a treatment container with an inlet at the bottom. The outlet of the inlet is connected to the inlet of an inner cylinder. Wastewater flows through the inner cylinder to the top of the treatment container and flows out through the gap between the inner cylinder and the treatment container. The wastewater sequentially passes through a large particle impurity remover and a demister installed at the top of the treatment container before flowing counter-currently into the interior of the treatment container. The wastewater is then filtered by a multi-porous screen, a drawer-type coarse filter media, and a drawer-type fine filter media sequentially installed inside the treatment container. After dripping into a fixed fluidized bed for biological treatment, the water flows out through a siphon outlet. Vent holes are provided on both sides of the treatment container near the demister. This invention achieves efficient wastewater treatment through a combination of counter-current aeration and multi-layer filter media, facilitating rapid deployment and operation.

Description

Technical Field

[0001] This application relates to the field of aquaculture technology, and more specifically, to an integrated device for removing pollutants from wastewater from facility-grown fish farming. Background Technology

[0002] Currently, in facility-based fish farming, especially in high-density short-term holding and quality improvement systems, fish stocking densities reach 50-100 kg / m³. 3 The discharged effluent often contains large amounts of nitrogen, phosphorus, COD, feces, uneaten feed, scales and other large and fine particles, as well as high concentrations of protein and carbon dioxide (CO2). If the effluent is not effectively treated, it can easily cause water pollution and cannot be recycled.

[0003] Existing wastewater treatment technologies mostly rely on sedimentation or biological methods for purification, which often suffer from problems such as large land area requirements, low treatment efficiency, low degree of facility integration, and inability to achieve centralized and efficient treatment. Their promotion in high-investment facility-based fishpond aquaculture systems is limited, making it urgent to develop integrated wastewater purification facilities and equipment that can save land, increase efficiency, and intensively treat the above pollutants. Summary of the Invention

[0004] This application aims to address at least one of the problems in existing technologies regarding the effective removal of various pollutants from high-density fish farming water. The facility effectively separates mucus components such as proteins and large particles from the water through microporous aeration and foam separation devices at the bottom of the inner cylinder. Furthermore, it utilizes a three-stage drawer-type filter media and counter-current air stripping technology in the external purification cylinder to efficiently remove dissolved nitrogen, phosphorus, COD, and carbon dioxide, achieving water purification. The specially designed cascading structure and openable filter media not only improve gas-liquid mass transfer efficiency but also solve the problem of inconvenient cleaning of traditional biological filter media, achieving an energy-saving and highly efficient water purification process. In addition, the cleverly designed outlet notch ensures unobstructed water flow, enhancing the overall treatment effect.

[0005] According to an embodiment of this application, an integrated pollutant removal device for wastewater from fish farming includes a treatment container. The bottom of the treatment container has an inlet, and the outlet of the inlet is connected to the inlet of the inner cylinder. Wastewater flows through the inner cylinder to the top of the treatment container and flows out from the gap between the inner cylinder and the treatment container. The wastewater passes through a large particle impurity remover and a demister installed at the top of the treatment container in sequence and then flows back into the interior of the treatment container. The wastewater is then filtered by a porous screen, a drawer-type coarse filter media, and a drawer-type fine filter media installed in sequence inside the treatment container. After the water is dripped into a fixed fluidized bed for biological treatment, it flows out through a siphon outlet. Vent holes are provided on both sides of the treatment container near the demister.

[0006] Furthermore, the bottom of the treatment container is provided with an aeration port, which aerates a large amount of air from the bottom to reduce the particles at the top.

[0007] Furthermore, the fixed fluidized bed uses positively buoyant carbon particles as the filter material.

[0008] Furthermore, an overflow weir is provided at the upper end of the processing container, which is used to regulate the water flow speed and direction.

[0009] Furthermore, valves are installed on both the inlet and the siphon outlet.

[0010] Furthermore, a flushing pipe is connected to the side wall of the processing container, and a valve is installed on the flushing pipe.

[0011] Furthermore, a sealing plate is slidably installed inside the treatment container on one side of the drawer-type coarse filter media. A water collection port is opened on the lower side of the sealing plate, and a guide plate is provided on one side of the water collection port. A sewage pipe is connected to the outlet end of the water collection port. The outlet end of the sewage pipe extends into the impurity collection box. A valve is installed on the sewage pipe, and a protruding plate supporting the sealing plate is provided on the inner wall of the treatment container.

[0012] Furthermore, both sides of the impurity collection box are provided with sliding grooves, and there are filter plates on the outer walls of the two sets of sliding grooves. The filter plates are slidably connected to the outer walls of the sliding grooves through the openings. The outlet end of the sewage pipe extends through the filter plate into the interior. The two sides of the filter plate are supported by the support plates provided on the inner wall of the impurity collection box.

[0013] Furthermore, a base plate is slidably installed at the bottom of the slide groove, and the two sides of the base plate are respectively threadedly connected to a pair of lead screws rotating in the two sets of slide grooves.

[0014] Furthermore, a drain outlet is provided on the side wall of the impurity collection box, a filter screen is installed inside the drain outlet, and a valve is installed on the drain outlet.

[0015] 1. The beneficial effects of this application are as follows: By sending the effluent from the bottom of the inner cylinder and then allowing it to flow counter-currently into the treatment container from the top for treatment, combined with bottom aeration, a low-pressure oxygenation method of counter-current air / water is formed. This not only effectively removes carbon dioxide but also significantly improves oxygen dissolution efficiency, ensuring sufficient oxygen in the effluent and promoting efficient nitrification. Furthermore, the use of filter media with different particle sizes not only provides a larger filtration surface area but also enhances the adhesion ability of bacteria through a water-absorbing coating, significantly improving the ammonia removal effect. The drawer-type design facilitates immediate replacement and recycling, and the device adopts a plug-and-play structural design, enabling rapid deployment and operation, reducing the installation and operation difficulty for farmers.

[0016] 2. The beneficial effects of this application are as follows: By installing valves at the inlet and siphon outlet, and using a flushing pipe to introduce external cleaning water for backwashing, impurities in the filter media are effectively removed, restoring filtration efficiency and extending service life. To further optimize the cleaning process, a sliding sealing plate is added inside the treatment container, connected to the impurity collection box via a water inlet and drain pipe, achieving centralized collection and treatment of impurities. Furthermore, chutes are installed on both sides of the impurity collection box, and the filter plates, connected by sliding connections, further retain impurities, ensuring the system's high efficiency. The design of the base plate and lead screw makes impurity cleaning more convenient, while the filter screen at the drain outlet ensures that impurities are effectively intercepted when wastewater is discharged. These designs not only improve resource recovery efficiency but also significantly reduce maintenance costs and enhance the system's stability and reliability.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic plan view of the overall structure of the integrated pollutant removal device for fish farming wastewater according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the planar structure according to Embodiment 1 of this application;

[0021] Figure 3 This is a partial schematic diagram of the processing container structure according to an embodiment of this application;

[0022] Figure 4 According to the embodiments of this application Figure 3 A schematic diagram of the structure at point A;

[0023] Figure 5 This is a schematic diagram of the sealing plate structure according to an embodiment of this application;

[0024] Figure 6 This is a side view of the processing container structure according to an embodiment of this application;

[0025] Figure 7 This is a cross-sectional schematic diagram of the impurity collection box structure according to an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the support plate structure according to an embodiment of this application;

[0027] Figure 9 This is a schematic diagram of the filter plate structure according to an embodiment of this application.

[0028] Icons: 1. Inner cylinder; 2. Large particle impurity remover; 3. Demister; 4. Overflow weir; 5. Porous screen; 6. Drawer-type coarse filter media; 7. Drawer-type fine filter media; 8. Siphon-type outlet; 9. Fixed fluidized bed; 10. Aeration port; 11. Inlet; 12. Sealing plate; 13. Sewage pipe; 14. Water collection port; 15. Guide plate; 16. Convex plate; 17. Impurity collection box; 18. Slide chute; 19. Base plate; 20. Screw rod; 21. Filter plate; 22. Support plate; 23. Slide port; 24. Processing container; 25. Filter screen; 26. Flushing pipe; 27. Vent. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The following describes, with reference to the accompanying drawings, an integrated pollutant removal device for fish farming tailwater according to an embodiment of this application.

[0038] Example 1

[0039] like Figure 2As shown, the integrated pollutant removal device for fish farming tailwater according to the embodiment of this application, by setting up an inner and outer double-cylinder treatment facility structure, can synergistically treat multiple pollutants in the water body, including a treatment container 24 and an inner cylinder 1 inside the treatment container 24. The inner cylinder 1 and the treatment container 24 are designed as inner and outer double cylinders. The bottom of the treatment container 24 is provided with a water inlet 11. The tailwater flows through the water inlet 11 to the inner cylinder 1 and then to the top of the treatment container 24. The bottom of the treatment container 24 is provided with an aeration port 10. By using the water inlet of the inner cylinder 1 and the bottom micropores for aeration, the mucus and other protein components produced in high-density fish farming are carried to the top of the tower in the form of a large amount of foam and separated from the water body by the foam separation device (demister 3). Vent holes 27 are opened on the two side walls of the treatment container 24 near the demister 3. The vent holes 27 can discharge gas and maintain the internal air pressure balance. Under the action of the aeration port 10, impurities in the water flow also rise together and do not accumulate at the water inlet 11, causing blockage.

[0040] There is a gap at the top of the treatment container 24 and the inner cylinder 1. After the tailwater reaches the top, it is discharged from the gap. The tailwater passes through the large particle impurity remover 2 and the demister 3 installed at the top of the treatment container 24 in sequence and then flows back into the interior of the treatment container 24. The tailwater passes through the large particle impurity remover 2 to remove some large particulate pollutants such as leaves and soil. The water flows from top to bottom and passes through the demister 3 to remove the mucus and film produced by aquaculture.

[0041] The large particle impurity remover 2 and the demister 3 are double-layered with a gap in the middle. Two sets of arc screens are used in the gap. One layer is for foam, and the other layer is for overflow water and solid particles. The arc screen is a 250-mesh arc screen, and the size of the arc screen meets the water flow requirements. All the water can flow into the treatment container 24 from the arc screen part.

[0042] During this process, large particles such as feces, uneaten food, and fish scales, as well as fine particles, are carried to the top of the tower by microbubbles and separated from the water through a micro-arc screen, thus removing many pollutants from the water.

[0043] Water flows from top to bottom. The separated water still contains dissolved pollutants such as nitrogen, phosphorus, and COD, as well as some fine particulate matter (< the screen aperture). It passes through the arc-shaped screen at the top of the tower into the external treatment container 24. The water flows down from the top and passes through three stages of drawer-type filter media, namely the porous screen 5, the drawer-type coarse filter media 6, and the drawer-type fine filter media 7. Water droplets flow down, while air is blown off from the bottom in a counter-current manner. The gas-liquid mass transfer efficiency is higher, and carbon dioxide, carbon, nitrogen, and phosphorus in the water are further removed.

[0044] By cleverly utilizing the potential energy of the water level caused by the rise of foam in the internal filter tank, water flows from top to bottom through a three-stage drawer biological filter, and air is used for reverse blowing to achieve energy saving and high-efficiency purification.

[0045] As the gas in the external processing container 24 rises from the bottom to the top, it is discharged through the gap between the inner and outer cylinders. The water drop arc net is only 50%. The inner cylinder 1, the large particle impurity remover 2, and the demister 3 are equipped with water outlet notches (approximately 50% of the diameter of the inner cylinder 1). Water under the foam in the upper part of the inner cylinder 1 flows through the notches to the overflow plate, solving the problem of poor downward flow caused by air top water.

[0046] The three-stage drawer-type filter media is unsaturated and features an openable drawer design for easy removal and regular cleaning, solving the problem of traditional biological filter media being difficult to remove and clean.

[0047] Drawer-type coarse filter media 6 removes larger suspended solids and impurities, while drawer-type fine filter media 7 removes smaller particles and impurities. By optimizing the air / water flow ratio and aeration mode, energy consumption is significantly reduced, effectively saving energy when treating high-flow-rate effluent. The effluent first flows into the counter-current aeration zone, where the water flows from bottom to top, while air is introduced from top through a specific piping system, forming a reverse-flowing air / water mixed flow.

[0048] This process utilizes the countercurrent movement of water and air to effectively remove carbon dioxide from the water, while oxygen from the air dissolves into the water. The oxygenation system optimizes oxygen dissolution efficiency by controlling the ratio of airflow to water flow, maximizing oxygen dissolution under low-pressure conditions.

[0049] After physical treatment, the water enters the biological filtration zone, where it drips into a fixed fluidized bed 9 for further biological treatment. The fixed fluidized bed 9 uses buoyant carbon particles as the filter material, which not only improves the filtration efficiency but also reduces the use of traditional materials. Furthermore, the material can be recycled during use, lowering raw material costs. At this stage, ammonia nitrogen in the water is removed by reacting with nitrifying bacteria attached to the floating carbon particles. To further enhance bacterial adhesion, the carbon particles are coated with an absorbent material, ensuring highly efficient biological filtration.

[0050] By effectively removing CO2 and ammonia nitrogen from the water and adding sufficient oxygen, this invention not only improves water quality but also avoids secondary pollution of the water body during the aquaculture process.

[0051] Furthermore, an overflow weir 4 is provided at the upper end of the treatment container 24, which is used to regulate the water flow speed and direction.

[0052] After the above series of treatment steps, the treated water flows out of the system through the siphon outlet 8, completing the entire purification process.

[0053] Example 2

[0054] Considering that impurities tend to accumulate inside the drawer-type coarse filter media 6 and drawer-type fine filter media 7 after prolonged use, this invention also includes a cleaning system to ensure the cleanliness of the filter media and maintain their high efficiency. For example... Figure 1 As shown, valves are installed on both the inlet 11 and the siphon outlet 8 to facilitate cleaning of the filter media inside the treatment container 24. First, the valves on the inlet 11 and the siphon outlet 8 are closed to prevent water from entering or leaving the treatment container 24, preparing it for subsequent cleaning. A flushing pipe 26 is connected to the side wall of the treatment container 24, and a valve is also installed on the flushing pipe 26. This pipe is specifically used to introduce external cleaning water. The valve on the flushing pipe 26 is opened, and cleaning water is introduced into the treatment container 24 via a pump or other equipment. This cleaning water will backwash the drawer-type fine filter media 7 and the drawer-type coarse filter media 6, effectively removing accumulated impurities from the filter media. During the backwashing process, impurities flow upwards with the water flow and are eventually carried away from the filter media area. This not only restores the filtration efficiency of the filter media but also extends its service life and reduces the need for frequent replacements.

[0055] To further optimize the cleaning process of the drawer-type coarse filter media 6, this invention adds a sliding sealing plate 12 inside the treatment container 24 to achieve more effective impurity removal and water resource management. The sealing plate 12 is slidably installed inside the treatment container 24 on one side of the drawer-type coarse filter media 6. The sealing plate 12 can slide into the treatment container 24 when cleaning is required, sealing the lower part of the drawer-type coarse filter media 6. A water collection port 14 is provided on the lower side of the sealing plate 12, and the water flow direction is guided by a guide plate 15. The outlet of the water collection port 14 is connected to a drain pipe 13, and the other end of the drain pipe 13 extends into the impurity collection box 17 for centralized collection of wastewater generated during the cleaning process. A valve is installed on the drain pipe 13. By opening this valve, the wastewater collected from the water collection port 14 during the cleaning process can be guided into the impurity collection box 17 through the drain pipe 13, completing the cleaning operation of the filter media. To prevent water overflow, a sealing strip is installed at the sliding part between the sealing plate 12 and the treatment container 24 to ensure good sealing of the entire system. In addition, the drain pipe 13 is designed to have a certain length to accommodate the movement requirements of the sealing plate 12.

[0056] A raised plate 16 is provided on the inner wall of the processing container 24 to support the sealing plate 12, thereby improving its stability during use. This not only helps to keep the sealing plate 12 in an accurate position during operation, but also enhances the safety and reliability of the overall structure.

[0057] To more effectively manage and recycle impurities, such as Figures 3 to 9As shown, sliding grooves 18 are provided on both sides of the impurity collection box 17. Filter plates 21 are installed on the outer walls of the two sets of sliding grooves 18. The filter plates 21 are slidably connected to the outer walls of the sliding grooves 18 through sliding openings 23, realizing convenient installation and removal of the filter plates 21. This design not only facilitates cleaning or replacement of the filter plates 21, but also effectively retains impurities entering the impurity collection box 17 at the bottom of the filter plates 21. To improve the stability of the filter plates 21 during use, support plates 22 are provided on the inner wall of the impurity collection box 17 to support both sides of the filter plates 21 and ensure their stability during operation.

[0058] A base plate 19 is slidably mounted at the bottom of the chute 18, and both sides of the base plate 19 are threadedly connected to a pair of lead screws 20 that rotate within the two sets of chute 18. When impurities enter the impurity collection box 17, they will deposit on the base plate 19. By rotating the lead screws 20, the height of the base plate 19 can be controlled, allowing it to move up and down, thus facilitating subsequent impurity cleaning.

[0059] A drain outlet is provided on the side wall of the impurity collection box 17, and a filter screen 25 is installed inside. A valve is installed on the drain outlet. After the valve is opened, sewage can be discharged through the filter screen 25, while impurities are trapped inside the impurity collection box 17 by the filter screen 25. This method can effectively discharge sewage and prevent impurities from being lost with the water flow.

[0060] In summary: First, close the valves on the inlet 11 and the siphon outlet 8. Then, slide the sealing plate 12 into the treatment container 24 to seal the area below the drawer-type coarse filter media 6. Open the valve on the flushing pipe 26 to allow external cleaning water to enter the treatment container 24 and backwash the filter media. Impurities will flow upward with the water and be collected in the collection port 14. Open the valve on the drain pipe 13, and the sewage will flow into the impurity collection box 17 through the collection port 14 and the drain pipe 13. After entering the impurity collection box 17, the impurities will be deposited on the bottom plate 19 and further screened and retained by the filter plate 21. Open the valve at the drain outlet to discharge the sewage. The impurities will be blocked by the filter screen 25 and retained inside the impurity collection box 17. Remove the filter plate 21 and then rotate the screw 20 to move the bottom plate 19 upward, bringing the impurities to the top of the impurity collection box 17 for easy cleaning.

[0061] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0062] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An integrated pollutant removal device for wastewater from fish farming facilities, characterized in that: The treatment container (24) is provided with an inlet (11) at the bottom. The outlet of the inlet (11) is connected to the inlet of the inner cylinder (1). The tailwater flows through the inner cylinder (1) to the top of the treatment container (24) and flows out from the gap between the inner cylinder (1) and the treatment container (24). The tailwater passes through the large particle impurity remover (2) and the demister (3) installed at the top of the treatment container (24) in sequence and then flows back into the interior of the treatment container (24). The tailwater is then filtered by the porous screen (5), the drawer-type coarse filter media (6) and the drawer-type fine filter media (7) installed in sequence inside the treatment container (24). After the water is dripped into the fixed fluidized bed (9) for biological treatment, it flows out through the siphon outlet (8). Vent holes (27) are provided on both sides of the treatment container (24) near the demister (3). The bottom of the treatment container (24) is provided with an aeration port (10), which reduces the amount of particulate matter at the top by aerating a large amount of air at the bottom. A sealing plate (12) is slidably installed inside the treatment container (24) on one side of the drawer-type coarse filter media (6).

2. The integrated pollutant removal device for wastewater from fish farming facilities according to claim 1, characterized in that: The fixed fluidized bed (9) uses positive buoyancy carbon particles as the filter material.

3. The integrated pollutant removal device for wastewater from fish farming facilities according to claim 2, characterized in that: The upper end of the processing container (24) is provided with an overflow weir (4), which is used to regulate the speed and direction of water flow.

4. The integrated pollutant removal device for wastewater from fish farming facilities according to claim 3, characterized in that: Valves are installed on both the inlet (11) and the siphon outlet (8).

5. The integrated pollutant removal device for wastewater from fish farming facilities according to claim 1, characterized in that: The processing container (24) is connected to a flushing pipe (26) on its side wall, and a valve is installed on the flushing pipe (26).

6. The integrated pollutant removal device for wastewater from fish farming facilities according to claim 5, characterized in that: A water collection port (14) is provided on the lower side of the sealing plate (12). A guide plate (15) is provided on one side of the water collection port (14). The water outlet of the water collection port (14) is connected to a sewage pipe (13). The water outlet of the sewage pipe (13) extends into the impurity collection box (17). A valve is installed on the sewage pipe (13). A protruding plate (16) supporting the sealing plate (12) is provided on the inner wall of the treatment container (24).

7. The integrated pollutant removal device for wastewater from fish farming facilities according to claim 6, characterized in that: Both sides of the impurity collection box (17) are provided with sliding grooves (18). There are filter plates (21) on the outer walls of the two sets of sliding grooves (18). The filter plates (21) are slidably connected to the outer walls of the sliding grooves (18) through the sliding openings (23). The outlet end of the sewage pipe (13) extends through the filter plate (21) into the interior. Both sides of the filter plate (21) are supported by the support plates (22) provided on the inner wall of the impurity collection box (17).

8. The integrated pollutant removal device for wastewater from fish farming facilities according to claim 7, characterized in that: A base plate (19) is slidably installed at the bottom of the slide groove (18), and the two sides of the base plate (19) are respectively threadedly connected to a pair of lead screws (20) rotating in the two sets of slide grooves (18).

9. The integrated pollutant removal device for wastewater from facility fish farming as described in claim 8, characterized in that: The impurity collection box (17) has a drain outlet on its side wall, a filter screen (25) is installed inside the drain outlet, and a valve is installed on the drain outlet.

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