Facility fish culture tail water pollutant integrated removal device

Abstract

The embodiment of the invention provides a facility fish culture tail water pollutant integrated removal device, and relates to the technical field of aquaculture. A facility fish culture tail water pollutant integrated removal device comprises a treatment container, a water inlet is formed in the bottom of the treatment container, the water outlet end of the water inlet is connected with the water inlet end of an inner cylinder, and tail water flows to the top of the treatment container through the inner cylinder and flows out of a gap between the inner cylinder and the treatment container. The tail water sequentially passes through the large-particle impurity remover and the demister which are mounted at the upper end of the treatment container and then reversely flows into the treatment container, the tail water is filtered by the porous sieve, the drawer-type coarse filter material and the drawer-type fine filter material which are sequentially mounted in the treatment container, and the water flow drips into the fixed fluidized bed for biological treatment and then flows out through the siphon-type water outlet; exhaust holes are formed in two side wall surfaces, close to the demister, of the treatment container. Through combination of countercurrent oxygenation and multiple layers of filter materials, efficient tail water treatment is realized, and rapid deployment and operation are facilitated.

Description

Technical Field

[0001] This application relates to the technical field of aquaculture, and more particularly, to an integrated device for removing pollutants from the tail water of facility fish farming. Background Art

[0002] Currently, in facility fish farming, especially in high-density temporary culture and quality improvement systems, the fish farming density reaches 50 - 100 kg / m 3 , and the discharged tail water often contains a large amount of nitrogen, phosphorus, COD, feces, residual bait, large particles and fine particles such as scales, as well as high concentrations of protein, carbon dioxide (CO2), etc. If the tail water is not effectively treated, it is likely to cause water pollution and cannot be recycled.

[0003] Most of the existing tail water treatment technologies purify through precipitation or biological methods, often having problems such as large floor area, low treatment efficiency, low degree of facilityization, and inability to achieve centralized and efficient treatment. Their promotion in facility fish pond farming systems with high investment is restricted, and there is an urgent need to develop an integrated tail water purification facility and equipment that can save land and have high energy efficiency for intensively treating the above pollutants. Summary of the Invention

[0004] This application aims to at least solve the problem in the prior art of being difficult to effectively remove various pollutants in high-density fish farming water bodies. Through the micro-pore aeration at the bottom of the inner cylinder and the foam separation device, this facility effectively separates mucus components such as protein and large particles from the water; further, by using the three-stage drawer-type filter media and air countercurrent stripping technology in the external purification cylinder, it efficiently removes dissolved nitrogen, phosphorus, COD and other pollutants as well as carbon dioxide in the water body, realizing water quality purification. The specially designed drop structure and the filter media that can be opened not only improve the gas-liquid mass transfer efficiency but also solve the problem of inconvenient cleaning of the traditional biological filter tower filter media, realizing an energy-saving and efficient water quality purification process. In addition, through the ingeniously designed water outlet notch, the water flow is ensured to be unobstructed, enhancing the overall treatment effect.

[0005] An integrated device for removing pollutants from the tail water of facility fish farming according to an embodiment of this application includes a treatment container. An inlet is provided at the bottom of the treatment container, and the outlet end of the inlet is connected to the inlet end of the inner cylinder. The tail water 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 tail water first passes through a large particle impurity remover and a defoamer installed at the upper end of the treatment container and then flows countercurrently into the interior of the treatment container. The tail water is then filtered successively by a porous sieve, drawer-type coarse filter media, and drawer-type fine filter media installed inside the treatment container. The water drops into a fixed fluidized bed for biological treatment and then flows out through a siphon-type water outlet. Exhaust holes are provided on both side walls of the treatment container near the defoamer.

[0006] Furthermore, an aeration port is provided at the bottom of the treatment container. Through a large amount of aeration at the bottom, the particulate matter at the top is reduced.

[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 treatment container, and the overflow weir is used to adjust the water flow rate and direction.

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

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

[0011] Furthermore, a sealing plate is slidably arranged in the treatment container on one side of the drawer-type coarse filter material. A water collecting port is opened on the lower side of the sealing plate. A flow guide plate is arranged on one side of the water collecting port. The water outlet end of the water collecting port is connected to a sewage discharge pipe. The water outlet end of the sewage discharge pipe extends into the impurity collection box. A valve is installed on the sewage discharge pipe. A convex plate for supporting the sealing plate is arranged on the inner wall of the treatment container.

[0012] Furthermore, sliding grooves are opened on both sides of the impurity collection box. Filter plates are arranged on the outer walls of the two groups of sliding grooves. The filter plates are slidably connected to the outer walls of the sliding grooves through the opened sliding openings. The water outlet end of the sewage discharge pipe penetrates through the filter plate and extends into the interior. Both sides of the filter plate are supported by support plates arranged on the inner wall of the impurity collection box.

[0013] Furthermore, a bottom plate is slidably installed at the bottom of the sliding groove. Both sides of the bottom plate are respectively threadedly connected to a pair of lead screws rotatably arranged in the two groups of sliding grooves.

[0014] Furthermore, a sewage discharge port is opened on the side wall of the impurity collection box. A filter screen is arranged inside the sewage discharge port, and a valve is installed on the sewage discharge port.

[0015] 1. The beneficial effects of this application are as follows: By sending the tail water into the inner cylinder from the bottom and then flowing reversely from the top into the treatment container for treatment, and combining with the aeration method at the bottom, a low-pressure oxygenation method of reverse-flow air / water is formed. It can not only effectively remove carbon dioxide, but also greatly improve the oxygen dissolution efficiency, ensure the sufficiency of oxygen in the tail water, promote the efficient progress of the nitrification process, and use filter materials with different particle sizes, which not only provides more filter surface area, but also enhances the adhesion ability of bacteria through the water-absorbing coating, significantly improving the ammonia removal effect. The drawer-type design is convenient for immediate replacement and recycling. The device adopts a plug-and-play structural design, which can be quickly deployed and operated, reducing the installation and operation difficulties for farmers.

[0016] 2. The beneficial effects of this application are as follows: By installing valves on the water inlet and the siphon outlet, and introducing external cleaning water through the flushing pipeline for reverse flushing, impurities in the filter media are effectively removed, the filtration efficiency is restored, and the service life is extended. To further optimize the cleaning process, a sliding sealing plate is added inside the treatment container, which is connected to the impurity collection box through the water collection port and the sewage pipe, realizing the centralized collection and treatment of impurities. In addition, chutes are provided on both sides of the impurity collection box, and the filter plate connected by sliding further retains impurities, ensuring the high efficiency of the system. The design of the bottom plate and the lead screw makes the impurity cleaning more convenient, and the filter screen at the sewage outlet ensures that impurities are effectively intercepted when the sewage is discharged. These designs not only improve the resource recovery efficiency, but also significantly reduce the maintenance cost, enhancing the stability and reliability of the system.

[0017] Additional aspects and advantages of this application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required to be used in the embodiments of this application. It should be understood that the following drawings only show some embodiments of this application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the overall planar structure schematic diagram of the integrated device for removing pollutants from the tail water of facility fish farming according to the embodiments of this application;

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

[0021] Figure 3 is the partial schematic diagram of the structure of the treatment container according to the embodiments of this application;

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

[0023] Figure 5 is the schematic diagram of the structure of the sealing plate according to the embodiments of this application;

[0024] Figure 6 is the side view schematic diagram of the structure of the treatment container according to the embodiments of this application;

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

[0026] Figure 8 It is a schematic structural diagram of a support plate according to an embodiment of the present application;

[0027] Figure 9 It is a schematic structural diagram of a filter plate according to an embodiment of the present application.

[0028] Icons: 1. Inner cylinder; 2. Large particle impurity remover; 3. Demister; 4. Overflow weir; 5. Porous sieve; 6. Drawer-type coarse filter media; 7. Drawer-type fine filter media; 8. Siphon-type water outlet; 9. Fixed fluidized bed; 10. Aeration port; 11. Water inlet; 12. Sealing plate; 13. Drain pipe; 14. Water collection port; 15. Deflector; 16. Convex plate; 17. Impurity collection box; 18. Slide groove; 19. Bottom plate; 20. Lead screw; 21. Filter plate; 22. Support plate; 23. Slide opening; 24. Processing container; 25. Filter screen; 26. Flushing pipeline; 27. Exhaust hole. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application.

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0035] In the present application, unless otherwise clearly specified and limited, the terms such as "install", "connect", "link", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] The following describes an integrated device for removing pollutants from the tail water of facility fish farming according to an embodiment of the present application with reference to the drawings.

[0038] Embodiment 1

[0039] As Figure 2As shown, according to the integrated device for removing pollutants from tail water of fish farming facilities of the embodiment of the present application, by setting up an inner and outer double-cylinder treatment facility structure, various pollutants in the water body can be synergistically treated, including a treatment container 24, and an inner cylinder 1 in the treatment container 24. The inner cylinder 1 and the treatment container 24 are of inner and outer double-cylinder design. A water inlet 11 is provided at the bottom of the treatment container 24. The tail water extends from the inner cylinder 1 through the water inlet 11 and flows to the top of the treatment container 24. An aeration port 10 is provided at the bottom of the treatment container 24. By using the inner cylinder 1 to enter water and the bottom micropore aeration, the protein components such as mucus generated in the high-density breeding of fish are brought to the top of the tower in the form of a large amount of foam and passed through the foam separation device (demister 3) to achieve separation from the water body. Exhaust holes 27 are provided on the two side walls of the treatment container 24 close to the demister 3. The exhaust holes 27 can discharge the gas to maintain the internal air pressure balance. Under the action of the aeration port 10, the impurities in the water flow also rise together, so as not to gather at the water inlet 11 and cause blockage.

[0040] A gap is left at the top of the treatment container 24 and the inner tube 1. The tail water is discharged from the gap after reaching the top. The tail water passes through the large particle impurity remover 2 and the demister 3 installed on the upper end of the treatment container 24 in turn and then flows back into the interior of the treatment container 24. The tail water passes through the large particle impurity remover 2 to remove some large particle pollutants such as leaves, soil and stones. The water flows from top to bottom and passes through the demister 3 to remove mucus and film-like substances produced by fishery farming.

[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 for flowing foam and the other layer for overflowing water and solid particles. The arc screen uses a 250-mesh arc screen, and the size of the arc screen meets the water flow requirements. The water flow can all flow into the processing container 24 from the arc screen.

[0042] That is, in this process, large particles such as feces, leftover bait, fish scales, and fine particles in the water are also brought to the top of the tower by microbubbles along with the water, and are separated from the water through a fine arc screen, thereby achieving the removal of more pollutants in the water.

[0043] The water flows from top to bottom. The separated water still contains dissolved pollutants such as dissolved nitrogen, phosphorus, COD and some fine particles (<sieve aperture), which are screened through the arc at the top of the tower to the external treatment container 24. The water flows down from the top and flows through the three-stage drawer-type filter filler layer by layer, namely the porous screen 5, the drawer-type coarse filter material 6 and the drawer-type fine filter material 7 to form water droplets flowing downward, while the air is blown off from the bottom in countercurrent, and the gas-liquid mass transfer efficiency is higher, so as to further remove carbon dioxide and carbon, nitrogen and phosphorus in the water.

[0044] Skillfully utilize the water level potential energy brought by the internal filter tank for foam lifting, and let the water cascade down through the three-stage drawer biological filter barrel from top to bottom, and use air reverse blowing to achieve energy conservation and efficient purification.

[0045] Since the gas in the external treatment container 24 goes from bottom to top, when it reaches the top, the gas is discharged from the gap between the inner and outer cylinders. The water-droplet arc-shaped net is only 50%. The inner cylinder 1, the large-particle impurity remover 2, and the foam remover 3 are provided with water outlet notches (about 50% of the diameter of the inner cylinder 1). The water under the foam in the upper part of the inner cylinder 1 flows to the overflow plate through the notch, solving the problem of unsmooth downstream flow caused by air pushing against the water.

[0046] The three-stage drawer-type filter filler is unsaturated filling. The drawer-type design can be opened, which is convenient for taking out the filler and cleaning it regularly, solving the problem that it is difficult to take out and clean the filler in the traditional biological filter tower.

[0047] The drawer-type coarse filter material 6 removes larger suspended solids and impurities, and the drawer-type fine filter material 7 removes smaller-sized particulate matters and impurities. Through the above optimization of the air / water ratio and the aeration mode, the energy consumption is greatly reduced, and the energy consumption can be effectively saved when treating high-flow tail water. The tail water first flows into the countercurrent aeration zone, where the water flows upward from the bottom, and the air is introduced from above through a specific pipeline system to form a counterflow air / water mixed flow.

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

[0049] The water after physical treatment enters the biological filtration area, and the water flow drips into the fixed fluidized bed 9 for a certain degree of biological treatment. The fixed fluidized bed 9 uses positively buoyant carbon particles as the filter material, which not only improves the filtration effect, but also reduces the use of traditional materials. And during the use process, the materials can be recycled, reducing the raw material cost. At this time, the ammonia nitrogen in the water is removed by reacting with nitrifying bacteria attached to the floating carbon particles. To further enhance the bacteria attachment ability, the surface of the carbon particles is coated with a water-absorbing substance, ensuring an efficient biological filtration effect.

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

[0051] And an overflow weir 4 is provided at the upper end of the treatment container 24, and the overflow weir 4 is used to adjust the water flow rate and direction.

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

[0053] Example Two

[0054] Considering that impurities are likely to accumulate inside the drawer - type coarse filter material 6 and the drawer - type fine filter material 7 after long - term use, in order to ensure the cleanliness of the filter material and maintain its high - efficiency performance, the present invention also designs a cleaning system. As Figure 1 shown, valves are installed on both the water inlet 11 and the siphon - type water outlet 8 to facilitate the cleaning operation of the filter material in the treatment container 24. First, close the valves on the water inlet 11 and the siphon - type water outlet 8 to prevent water from flowing into or out of the treatment container 24, and make preparations for the subsequent cleaning work. A flushing pipeline 26 is connected to the side wall of the treatment container 24, and a valve is also installed on the flushing pipeline 26. This pipeline is specifically used to introduce external cleaning water. Open the valve on the flushing pipeline 26 and introduce the cleaning water into the interior of the treatment container 24 through devices such as a water pump. These cleaning waters will conduct back - flushing on the drawer - type fine filter material 7 and the drawer - type coarse filter material 6, effectively removing the accumulated impurities in the filter material. During the back - flushing process, the impurities flow upward with the water flow and are finally carried away from the filter material area. This not only restores the filtration efficiency of the filter material but also extends its service life and reduces the need for frequent replacement.

[0055] To further optimize the cleaning process of the drawer - type coarse filter material 6, the present invention additionally installs 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 arranged inside the treatment container 24 on one side of the drawer - type coarse filter material 6. The sealing plate 12 can slide into the treatment container 24 when cleaning is required to seal the part below the drawer - type coarse filter material 6. A water collecting port 14 is opened on the lower side of the sealing plate 12, and the water flow direction is guided by a diversion plate 15. The water outlet end of the water collecting port 14 is connected to a sewage discharge pipe 13, and the other end of the sewage discharge pipe 13 extends into the interior of the impurity collection box 17 for centrally collecting the sewage generated during the cleaning process. A valve is installed on the sewage discharge pipe 13. By opening this valve, the sewage collected from the water collecting port 14 during the cleaning process can be introduced into the impurity collection box 17 through the sewage discharge pipe 13 to complete the cleaning operation of the filter material. To prevent water from overflowing, sealing strips are installed at the sliding part of the sealing plate 12 and the treatment container 24 to ensure good sealing of the entire system. In addition, the sewage discharge pipe 13 is designed with a certain length to adapt to the movement requirements of the sealing plate 12.

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

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

[0058] A bottom plate 19 is slidably installed at the bottom of the chute 18. Both sides of the bottom plate 19 are respectively threadedly connected to a pair of lead screws 20 rotating in the two groups of chutes 18. When impurities enter the impurity collection box 17, they will deposit on the bottom plate 19. By rotating the lead screws 20, the height of the bottom plate 19 can be controlled to move it up and down, facilitating subsequent impurity cleaning work.

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

[0060] In summary: First, close the valves on the water 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 material 6. Open the valve on the flushing pipeline 26 to allow the external cleaning water to enter the treatment container 24 and backwash the filter material. The impurities flow upward with the water flow and are collected at the water collection port 14. Open the valve on the sewage discharge pipe 13, and the sewage flows into the impurity collection box 17 through the water collection port 14 and the sewage discharge pipe 13. The impurities deposit on the bottom plate 19 after entering the impurity collection box 17 and are further screened and retained by the filter plates 21. Open the valve at the sewage discharge port to discharge the sewage, and the impurities are blocked by the filter screen 25 and retained inside the impurity collection box 17. Remove the filter plates 21, then rotate the lead screws 20 to move the bottom plate 19 upward to bring the impurities to the upper end of the impurity collection box 17 for easy cleaning.

[0061] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0062] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An integrated device for removing pollutants from the tail water of facility fish farming, characterized in that: It includes a processing container (24). An inlet (11) is provided at the bottom of the processing container (24). The water outlet end of the inlet (11) is connected to the water inlet end of the inner cylinder (1). The tail water flows through the inner cylinder (1) to the top of the processing container (24) and flows out from the gap between the inner cylinder (1) and the processing container (24). The tail water successively passes through a large particle impurity remover (2) and a demister (3) installed at the upper end of the processing container (24) and then flows reversely into the interior of the processing container (24). The tail water is then filtered by a porous sieve (5), a drawer-type coarse filter material (6), and a drawer-type fine filter material (7) successively installed inside the processing container (24). The water drops into a fixed fluidized bed (9) for biological treatment and then flows out through a siphon water outlet (8). Exhaust holes (27) are provided on both side wall surfaces of the processing container (24) near the demister (3).

2. The integrated removal device for pollutants in the tail water of facility fish farming according to claim 1, characterized in that: An aeration port (10) is provided at the bottom of the processing container (24). By aerating a large amount at the bottom, the particulate matter at the top is reduced.

3. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 2, wherein: The fixed fluidized bed (9) uses positively buoyant carbon particles as the filtering material.

4. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 3, wherein: An overflow weir (4) is provided at the upper end of the processing container (24). The overflow weir (4) is used to adjust the water flow rate and direction.

5. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 4, characterized in that: Valves are installed on both the inlet (11) and the siphon water outlet (8).

6. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 1, characterized in that: A flushing pipeline (26) is connected to the side wall of the processing container (24). A valve is installed on the flushing pipeline (26).

7. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 6, characterized in that: A sealing plate (12) is slidably arranged inside the processing container (24) on one side of the drawer-type coarse filter material (6). A water collecting port (14) is provided on the lower side of the sealing plate (12). A flow guide plate (15) is arranged on one side of the water collecting port (14). The water outlet end of the water collecting port (14) is connected to a sewage discharge pipe (13). The water outlet end of the sewage discharge pipe (13) extends into the interior of an impurity collection box (17). A valve is installed on the sewage discharge pipe (13). A convex plate (16) for supporting the sealing plate (12) is arranged on the inner wall of the processing container (24).

8. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 7, characterized in that: Chute grooves (18) are provided on both sides of the impurity collection box (17). A filter plate (21) is arranged on the outer walls of the two groups of chute grooves (18). The filter plate (21) is slidably connected to the outer walls of the chute grooves (18) through sliding openings (23) provided. The water outlet end of the sewage discharge pipe (13) penetrates through the filter plate (21) and extends into the interior. The two sides of the filter plate (21) are supported by support plates (22) arranged on the inner wall of the impurity collection box (17).

9. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 8, wherein: A bottom plate (19) is slidably installed at the bottom of the chute groove (18). The two sides of the bottom plate (19) are respectively threadedly connected to a pair of lead screws (20) rotating in the two groups of chute grooves (18).

10. The integrated device for removing pollutants from the tail water of facility fish farming according to claim 9, characterized in that: A sewage discharge port is provided on the side wall of the impurity collection box (17). A filter screen (25) is arranged inside the sewage discharge port, and a valve is installed on the sewage discharge port.

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