Recirculating aquaculture system

Abstract

The embodiment of the application discloses a circulating water aquaculture system, comprising: an aquaculture pond, a solid-liquid separation device, an elevator, a protein separator, a biochemical water treatment device and a backflow unit, the aquaculture pond, the solid-liquid separation device, the elevator, the protein separator and the biochemical water treatment device are sequentially arranged along a water inlet direction, and the backflow unit is connected with the biochemical water treatment device and the aquaculture pond. The circulating water aquaculture system can make the treated aquaculture wastewater backflow to the aquaculture pond for recycling, so that the aquaculture pond only needs to supplement a small amount of water, which can greatly save water resources, greatly reduce the infection of pathogenic bacteria brought by additional water, and effectively improve the aquaculture density and the aquaculture quality.

Description

Technical Field

[0001] This application relates to the field of aquaculture technology, and in particular to a recirculating aquaculture system. Background Technology

[0002] Existing aquaculture ponds mainly use nearby natural water (such as river water, lake water, etc.) to directly draw water into the ponds for the cultivation of aquatic species. During the cultivation process, the water used in the ponds is usually not purified, which makes it impossible to control the concentration of pollutants in the water, thus affecting the stocking density and quality of the aquaculture. Utility Model Content

[0003] Therefore, it is necessary to provide a recirculating aquaculture system that can improve stocking density and stocking quality.

[0004] A recirculating aquaculture system includes: an aquaculture pond, a solid-liquid separation device, a lift, a protein separator, a biochemical water treatment device, and a reflux unit. The aquaculture pond, the solid-liquid separation device, the lift, the protein separator, and the biochemical water treatment device are arranged sequentially along the water inlet direction. The reflux unit is connected to the biochemical water treatment device and the aquaculture pond.

[0005] The solid-liquid separation equipment is used to remove solid pollutants from the aquaculture wastewater discharged from the aquaculture pond;

[0006] The elevator is used to pressurize and lift the aquaculture wastewater treated by the solid-liquid separation equipment into the protein separator;

[0007] The protein separator is used to remove protein-containing organic matter from the aquaculture wastewater;

[0008] The biochemical water treatment equipment is used to treat the aquaculture wastewater using biochemical methods.

[0009] The reflux unit is used to return the aquaculture wastewater treated by the biochemical water treatment equipment to the aquaculture pond.

[0010] In the aforementioned recirculating aquaculture system, the aquaculture wastewater discharged from the aquaculture ponds is first fed into a solid-liquid separation device to remove solid pollutants. Then, the treated wastewater is fed into a lift pump, which pressurizes and elevates it to a protein skimmer, addressing the issue of low water levels preventing gravity flow to the skimmer. The protein skimmer then removes protein-containing organic matter. Next, a biological water treatment system removes pollutants such as ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen. Finally, the treated wastewater is returned to the aquaculture ponds via a reflux unit, forming a fully enclosed recirculating aquaculture system. Therefore, this recirculating aquaculture system allows treated wastewater to be recycled back to the aquaculture ponds, requiring only a small amount of water replenishment. This significantly saves water resources, reduces the risk of bacterial infection from external water supply, and effectively improves stocking density and quality. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the recirculating aquaculture system in one embodiment;

[0013] Figure 2 This is a structural block diagram of a recirculating aquaculture system in one embodiment;

[0014] Figure 3 for Figure 1 The diagram shows a cross-sectional view of a recirculating aquaculture system.

[0015] Figure 4 This is a schematic diagram of the solid-liquid separation device in one embodiment;

[0016] Figure 5 for Figure 4 A cross-sectional view of the solid-liquid separation device shown;

[0017] Figure 6 This is a diagram showing the combination of a solid-liquid separation device and an aquaculture pond in one embodiment.

[0018] Figure 7 for Figure 4 The diagram shows the structure of the solid-liquid separation device after the hidden portion of the housing is shown.

[0019] Figure 8 This is a schematic diagram of the structure of a microfilter in one embodiment;

[0020] Figure 9 for Figure 8 The cross-sectional view of the microfilter shown;

[0021] Figure 10 for Figure 8 A cross-sectional view of the microfilter shown from another perspective;

[0022] Figure 11 for Figure 8 Another cross-sectional view of the microfilter shown;

[0023] Figure 12 This is a schematic diagram of the protein separator in one embodiment;

[0024] Figure 13 for Figure 12 The cross-sectional view of the protein separator shown;

[0025] Figure 14 for Figure 13 Enlarged view of point A in the middle;

[0026] Figure 15 This is a schematic diagram of the structure of a biochemical water treatment device in one embodiment;

[0027] Figure 16 for Figure 15 The diagram shows a cross-sectional view of the biochemical water treatment equipment.

[0028] Figure 17 This is a schematic diagram of the water distribution assembly in one embodiment;

[0029] Figure 18 for Figure 17 A cross-sectional view of a partial structure of the water distribution assembly shown;

[0030] Figure 19 for Figure 17 A partial structural schematic diagram of the water distribution assembly shown;

[0031] Figure 20 for Figure 17 A cross-sectional view of a partial structure of the water distribution assembly shown from another perspective. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] like Figure 1 and Figure 2 As shown, this application provides a recirculating aquaculture system 10, which includes an aquaculture pond 100, a solid-liquid separation device 201, an elevator 202, a protein skimmer 400, a biochemical water treatment device 500, and a reflux unit 600. The aquaculture pond 100, solid-liquid separation device 201, elevator 202, protein skimmer 400, and biochemical water treatment device 500 are arranged sequentially along the water inlet direction. The reflux unit 600 connects the biochemical water treatment device 500 and the aquaculture pond 100. The liquid separation device 201 is used to remove solid pollutants from the aquaculture wastewater discharged from the aquaculture pond 100; the elevator 202 is used to pressurize and lift the aquaculture wastewater treated by the solid-liquid separation device 201 to the protein separator 400; the protein separator 400 is used to remove organic matter containing protein from the aquaculture wastewater; the biochemical water treatment device 500 is used to treat the aquaculture wastewater; and the reflux unit 600 is used to return the aquaculture wastewater treated by the biochemical water treatment device 500 to the aquaculture pond 100.

[0036] In operation, the aforementioned recirculating aquaculture system 10 first inputs the aquaculture wastewater discharged from the aquaculture pond 100 into the solid-liquid separation device 201. The solid pollutants in the wastewater are removed by the solid-liquid separation device 201. Then, the treated wastewater is input into the elevator 202, which pressurizes and lifts the wastewater to the protein separator 400. This addresses the problem of the wastewater's low water level preventing it from flowing to the protein separator 400 by gravity. The protein separator 400 then removes protein-containing organic matter from the wastewater, followed by biological water treatment. The equipment 500 performs biochemical treatment on aquaculture wastewater to remove pollutants such as ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen. Finally, the treated aquaculture wastewater is returned to the aquaculture pond 100 through the return unit 600, forming a fully enclosed recirculating aquaculture system 10. Therefore, the recirculating aquaculture system 10 of this application enables the treated aquaculture wastewater to be returned to the aquaculture pond 100 for recycling, so that the aquaculture pond 100 only needs to be supplemented with a small amount of water. This not only greatly saves water resources, but also greatly reduces the infection of bacteria caused by external water, and effectively improves the stocking density and aquaculture quality.

[0037] In one embodiment, the solid-liquid separation device 201 includes a solid-liquid separation unit 200 and a microfilter 300 arranged sequentially along the water inlet direction; the solid-liquid separation unit 200 is used to remove heavy solid pollutants from the aquaculture wastewater discharged from the aquaculture pond 100; the microfilter 300 is used to remove light and fine solid pollutants from the aquaculture wastewater.

[0038] like Figure 1 and Figure 2 As shown, further, the number of aquaculture ponds 100 is at least two, and the at least two aquaculture ponds 100 include a first aquaculture pond 101 and a second aquaculture pond 102. The second aquaculture pond 102 is used to raise some of the cultured organisms separated from the first aquaculture pond 101. The first aquaculture pond 101, solid-liquid separation device 200, microfilter 300, elevator 202, protein separator 400 and biochemical water treatment equipment 500 are arranged sequentially along the water inlet direction, and the reflux unit 600 is connected to the biochemical water treatment equipment 500 and the first aquaculture pond 101. The second aquaculture pond 102, microfilter 300, elevator 202, protein separator 400 and biochemical water treatment equipment 500 are arranged sequentially along the water inlet direction, and the reflux unit 600 is connected to the biochemical water treatment equipment 500 and the second aquaculture pond 102.

[0039] Specifically, the first aquaculture pond 101 is a high-density aquaculture pond, with a high stocking density of aquatic organisms, resulting in a high concentration and large quantity of pollutants such as feces. Furthermore, the aquatic organisms are small in size, making it easy for wastewater discharged from the bottom of the first aquaculture pond 101 to be lost along with the wastewater. Therefore, the aquaculture wastewater output from the first aquaculture pond 101 is first fed into a solid-liquid separation device 200 for solid-liquid separation to remove heavy solid pollutants. Then, the treated aquaculture wastewater is sequentially fed into a microfilter 300 for further solid-liquid separation to remove light and fine solid pollutants. Finally, the treated aquaculture wastewater is sequentially fed into a protein separator 400, a biochemical water treatment device 500, and other subsequent water treatment units for further treatment.

[0040] Once the cultured organisms in the first culture tank 101 have grown to a certain size, a portion of them need to be transferred to the second culture tank 102 for separate rearing to reduce the rearing load on the first culture tank 101. The wastewater from the second culture tank 102 typically only needs to be fed into a microfilter 300 for solid-liquid separation to remove light and fine solid pollutants. This treated wastewater is then fed into subsequent water treatment units such as a protein separator 400 and a biological water treatment system 500 for further treatment. Furthermore, the return unit 600 is used to return the treated wastewater (i.e., clarified liquid) from the biological water treatment system 500 to both the first and second culture tanks 101 for recycling. This allows both tanks to require only a small amount of water replenishment, significantly saving water resources and reducing the risk of bacterial infection from external water supply, effectively improving stocking density and quality.

[0041] like Figure 3 As shown, in one embodiment, the aquaculture pond 100 is connected to the solid-liquid separation device 201 via a wastewater discharge pipe 103. The aquaculture wastewater output from the aquaculture pond 100 can be input into the solid-liquid separation device 201 through the wastewater discharge pipe 103. Further, a filter element 104 is provided at the connection between the wastewater discharge pipe 103 and the aquaculture pond 100. The filter element 104 is located at the bottom of the aquaculture pond 100. One end of the wastewater discharge pipe 103 is connected to the filter element 104, and the other end of the wastewater discharge pipe 103 is connected to the solid-liquid separation device 201. The filter element 104 may include, but is not limited to, a bar screen. The filter element 104 is used to separate the aquaculture products and aquaculture wastewater output from the aquaculture pond 100, thereby preventing the aquaculture products from being discharged into the solid-liquid separation device 201 along with the aquaculture wastewater during the sewage discharge process.

[0042] Specifically, the first aquaculture pond 101 is connected to the microfilter 300 via a wastewater discharge pipe 103. The aquaculture wastewater output from the first aquaculture pond 101 can be input into the microfilter 300 through the wastewater discharge pipe 103. A filter element 104 is installed at the connection between the wastewater discharge pipe 103 and the first aquaculture pond 101. The filter element 104 is located at the bottom of the first aquaculture pond 101. One end of the wastewater discharge pipe 103 is connected to the filter element 104, and the other end of the wastewater discharge pipe 103 is connected to the microfilter 300. For example... Figure 1 and Figure 2 As shown, in one embodiment, the recirculating aquaculture system 10 further includes an ultraviolet sterilizer 700, which is disposed between the elevator 202 and the protein separator 400. The ultraviolet sterilizer 700 is used to disinfect the aquaculture wastewater and remove harmful bacteria and pathogens from the aquaculture wastewater.

[0043] like Figure 1 As shown, in one embodiment, the recirculating aquaculture system 10 further includes a workbench 800 for users to walk on in order to perform operations of the recirculating aquaculture system 10. The workbench 800 is located near the aquaculture pond 100, specifically, between the first aquaculture pond 101 and the second aquaculture pond 102.

[0044] Furthermore, the recirculating aquaculture system 10 also includes an electrical control cabinet 900, which is located near the biochemical water treatment equipment 500 and is used to control the operation of each piece of equipment in the recirculating aquaculture system 10.

[0045] like Figure 4 and Figure 5 As shown, in one embodiment, the solid-liquid separation device 200 includes a housing 210 and a filter element 220. A first inlet 211 and a first outlet 212 are provided on the side wall of the housing 210, with the first inlet 211 located above the first outlet 212. The filter element 220 is disposed inside the housing 210, and a first opening 221 and a second opening 222 are provided at the top and bottom of the filter element 220, respectively.

[0046] The aquaculture wastewater can flow into the housing 210 through the first inlet 211 and into the filter element 220 through the first opening 221. Under the solid-liquid separation action of the filter element 220, the water separated from the aquaculture wastewater can flow out of the filter element 220 through the filter holes on the periphery of the filter element 220 and then flow out of the housing 210 through the first outlet 212. The solid pollutants separated from the aquaculture wastewater can be discharged from the filter element 220 through the second opening 222 and settle to the bottom of the housing 210.

[0047] The solid-liquid separation device 200 provided in this application, when aquaculture wastewater enters the housing 210 through the first inlet 211 and flows into the filter element 220 through the first opening 221, undergoes solid-liquid separation through the filter element 220. The separated water (i.e., clear liquid) can flow out of the filter element 220 through the filter holes on the periphery of the filter element 220 and then out of the housing 210 through the first outlet 212. At the same time, solid pollutants (such as aquatic organisms) intercepted and separated by the filter element 220 in the aquaculture wastewater are separated. Solid pollutants such as uneaten feed and feces in the aquaculture wastewater are discharged from the filter element 220 through the second opening 222 and settle to the bottom of the shell 210. Compared with traditional solid-liquid separation equipment, the filter element 220 of the solid-liquid separation device 200 of this application adopts a water flow pattern of center inlet and periphery outlet, so that the solid pollutants separated from the aquaculture wastewater can flow to the bottom of the shell 210 by gravity for sedimentation and concentration, thereby efficiently removing solid pollutants from the aquaculture wastewater. It has the advantages of high treatment efficiency and good treatment effect.

[0048] like Figure 5 and Figure 6 As shown, in one embodiment, the solid-liquid separation device 200 further includes an inlet pipe 230, the outlet end of which is connected to a first inlet 211. The inlet end of the inlet pipe 230 is used to extend into the aquaculture pond 100, and the first inlet 211 is located above the inlet end of the inlet pipe 230. The aquaculture wastewater output from the aquaculture pond 100 can flow into the solid-liquid separation device 200 through the inlet pipe 230 and the first inlet 211 in sequence for solid-liquid separation.

[0049] Specifically, traditional aquaculture ponds use bottom drainage, resulting in a large volume of wastewater at the bottom due to gravity. This causes small organisms (especially in the early stages of aquaculture when they are relatively small) to easily flow out with the wastewater. The solid-liquid separation device 200 of this application uses a specific inlet method: the wastewater enters the device through a higher inlet 211 for solid-liquid separation. This prevents smaller organisms from being discharged with the wastewater to subsequent treatment units during drainage. Furthermore, traditional bottom drainage relies on valves on the drain pipe for wastewater control, which are prone to clogging and difficult to operate. The solid-liquid separation device 200 of this application, however, eliminates the risk of valve clogging because no large amounts of organisms are discharged through the drain pipe, resulting in more accurate and stable wastewater control.

[0050] like Figure 7As shown, in one embodiment, a water outlet 212 is provided with a water outlet pipe 240. The first end of the water outlet pipe 240 extends into the housing 210 and surrounds the filter element 220. The second end of the water outlet pipe 240 extends out of the housing 210. The first end of the water outlet pipe 240 is provided with a plurality of perforations at intervals. The water separated from the aquaculture wastewater (i.e., the clear liquid) can flow into the first end of the water outlet pipe 240 through the perforations and then be discharged to the outside through the second end of the water outlet pipe 240.

[0051] like Figure 5 As shown, in one embodiment, the filter element 220 is a hollow cubic grid structure. A first opening 221 is provided in the center of the top wall of the filter element 220, and a second opening 222 is provided in the center of the bottom wall of the filter element 220. The first opening 221 and the second opening 222 are aligned in the height direction of the filter element 220, and filter holes are provided on the four opposite side walls of the filter element 220.

[0052] like Figure 5 As shown, in one embodiment, the solid-liquid separation device 200 further includes a siphon inlet pipe 250, which is disposed on the side wall of the housing 210. The siphon inlet pipe 250 is used to inject water into the housing 210 to change the water level inside the housing 210, thereby triggering a siphon, so that the aquaculture wastewater to be treated can automatically flow into the housing 210 through the first inlet 211 by siphon. By adopting a siphon-based non-powered water intake method, the aquaculture wastewater to be treated can automatically flow into the housing 210 through the first inlet 211 without additional power, eliminating the need for an inlet pump and effectively reducing the operating energy consumption of the solid-liquid separation device 200.

[0053] Specifically, the water injected into the shell 210 by the siphon pipe 250 may include at least one of clean water (e.g., tap water), raw water for aquaculture wastewater (e.g., aquaculture wastewater), and circulating water. In practice, the first outlet 212 is first blocked, and water is poured into the shell 210 through the siphon pipe 250. Then, the first outlet 212 is opened to lower the water level in the shell 210, thereby triggering a siphon. This allows the aquaculture wastewater to be treated to automatically flow into the shell 210 through the first inlet 211 without additional power.

[0054] like Figure 7As shown, in one embodiment, the solid-liquid separation device 200 further includes an aeration backwashing assembly 260, which is disposed within the housing 210 and located near the bottom of the filter element 220. Specifically, when the filter element 220 is covered with solid contaminants (such as uneaten food or feces), causing poor water flow, the aeration backwashing assembly 260 cleans the filter element 220 by aeration backwashing, promptly removing the solid contaminants adhering to the filter element 220. Simultaneously, the solid contaminants detached from the filter element 220 can be discharged through the second opening 222 of the filter element 220 and settle at the bottom of the housing 210, ensuring the normal operation of the filter element 220. Furthermore, this solution, by employing aeration backwashing, eliminates the need for a backwash drainage pump, resulting in lower energy consumption.

[0055] In one embodiment, the aeration backwashing assembly 260 includes an aeration pipe 261 and a plurality of aeration heads 262. The aeration pipe 261 surrounds the outer periphery of the filter element 220, and the plurality of aeration heads 262 are spaced apart on the aeration pipe 261 circumferentially. Further, the aeration backwashing assembly 260 also includes an air inlet pipe 263, one end of which is connected to the aeration pipe 261, and the other end of which extends out of the housing 210 through the side wall of the housing 210.

[0056] like Figure 7 As shown, in one embodiment, the solid-liquid separation device 200 further includes an exhaust pipe 270, which is disposed on the top of the housing 210. The exhaust pipe 270 is used to discharge excess gas output by the aeration backwashing component 260, as well as foam formed during the contact between the organic matter containing protein in the aquaculture wastewater and the gas output by the aeration backwashing component 260.

[0057] Specifically, the aeration backwashing component 260 also functions as a protein separation unit for aquaculture wastewater. When the aeration backwashing component 260 starts aeration, the gas bubbles generated by the aeration backwashing component 260 injected into the aquaculture wastewater are broken down by the filtration component into tiny bubbles. In this state, when organic pollutants containing protein in the aquaculture wastewater come into contact with these bubbles, foam is formed. This foam can eventually be discharged to the outside through the exhaust pipe 270 provided at the top of the shell 210, thereby achieving a large-scale removal of organic matter containing protein from the aquaculture wastewater. Therefore, compared with traditional solid-liquid separation equipment, the solid-liquid separation device 200 of this application integrates sedimentation, filtration, and protein separation functions into one unit. The solid pollutants (such as uneaten feed and feces) separated from the aquaculture wastewater are discharged after sedimentation, resulting in a higher discharge concentration.

[0058] like Figure 7As shown, in one embodiment, a partition 280 is provided inside the housing 210 to divide the interior of the housing 210 into a first space 213 and a second space 214 distributed from top to bottom. A filter element 220 is disposed in the second space 214. The partition 280 is provided with through holes. An exhaust pipe 270 is connected to the first space 213. Excess gas and foam output by the aeration backwashing assembly 260 can enter the second space 214 through the holes and then be discharged to the outside through the exhaust pipe 270.

[0059] Furthermore, the partition 280 includes a first inclined plate 281 and a second inclined plate 282 connected to each other. Both the first inclined plate 281 and the second inclined plate 282 are obliquely placed inside the housing 210, and the inclination directions of the first inclined plate 281 and the second inclined plate 282 are opposite. The first inclined plate 281 and the second inclined plate 282 form an inverted V-shaped structure, and multiple through holes are provided at intervals at the connection between the first inclined plate 281 and the second inclined plate 282. Specifically, multiple rows of through holes are provided on the side where the first inclined plate 281 and the second inclined plate 282 are connected to each other, and each row of through holes includes multiple through holes spaced apart along the same straight line.

[0060] like Figure 7 As shown, in one embodiment, a sludge hopper 215 is formed at the bottom of the shell 210. The sludge hopper 215 is used to collect solid pollutants separated from aquaculture wastewater. A sludge discharge pipe 216 is provided at the bottom of the sludge hopper 215. The sludge discharge pipe 216 is used to discharge the solid pollutants collected by the sludge hopper 215 to the outside.

[0061] like Figure 8 As shown, in one embodiment, the microfilter 300 includes a housing 310, a drum assembly 320, a backwashing mechanism 330, and a sludge collection tank 340. The housing 310 is divided into an inlet chamber 311 and a filter chamber 312. A second inlet 313 and a second outlet 314 are provided on the side wall of the housing 310. The second inlet 313 communicates with the inlet chamber 311, and the second outlet 314 communicates with the filter chamber 312. The drum assembly 320 is rotatably disposed in the filter chamber 312, and one end of the drum assembly 320 is connected to the inlet chamber 311. The backwashing mechanism 330 is used to backwash the drum assembly 320. One end of the sludge collection tank 340 is disposed in the drum assembly 320, and the other end of the sludge collection tank 340 extends out of the drum assembly 320 and extends to the inlet chamber 311 and connects to the inner side wall of the housing 310. The sludge collection tank 340 does not rotate with the drum assembly 320.

[0062] In operation, the aforementioned microfilter 300 allows aquaculture wastewater to enter the inlet chamber 311 through the second inlet 313. The wastewater then flows into the rotating drum assembly 320 from one end. Under the centrifugal force and filtration action of the rotating drum assembly 320, the wastewater undergoes solid-liquid separation. Solid pollutants separated from the wastewater are retained within the rotating drum assembly 320, while the separated water (i.e., clear liquid) flows out from the periphery of the rotating drum assembly 320 and falls into the filter chamber 312, finally exiting through the second outlet 314. Furthermore... The backwashing mechanism 330 can backwash the drum assembly 320 to promptly remove solid pollutants trapped on the drum assembly 320. At the same time, the aquaculture wastewater after backwashing the drum assembly 320 can fall into the collection tank 340 for subsequent centralized discharge to the outside. Therefore, the microfilter 300 of this application allows the aquaculture wastewater in the inlet chamber 311 to flow directly into the drum assembly 320 through one end of the drum assembly 320, realizing open water intake. This eliminates the structural form of the inlet pipe running through the box and extending along the axis of the drum assembly into the drum assembly. The structure and process are simpler, the product manufacturing cost is lower, and disassembly and maintenance are convenient.

[0063] like Figure 9 As shown, further, the end of the sludge collection tank 340 away from the drum assembly 320 is connected to a drain pipe 341, which protrudes from the side wall of the housing 310 and is exposed. Specifically, when the backwashing mechanism 330 backwashes the drum assembly 320, the aquaculture wastewater after backwashing the drum assembly 320 falls into the sludge collection tank 340 and then flows out of the housing 310 along the drain pipe 341.

[0064] like Figure 10 As shown, the sludge collection trough 340 includes a first inclined sidewall 342 and a second inclined sidewall 343 connected to each other, and the first inclined sidewall 342 and the second inclined sidewall 343 have opposite inclination directions. The first inclined sidewall 342 and the second inclined sidewall 343 enclose each other to form a V-shaped sludge collection trough 340. Specifically, the first inclined sidewall 342 and the second inclined sidewall 343 extend along the length direction of the sludge collection trough 340, the lengths of the first inclined sidewall 342 and the second inclined sidewall 343 are the same, the width of the first inclined sidewall 342 is greater than the width of the second inclined sidewall 343, and the included angle formed between the first inclined sidewall 342 and the second inclined sidewall 343 is 90 degrees, that is, the first inclined sidewall 342 and the second inclined sidewall 343 are vertically connected.

[0065] Furthermore, the sludge collection tank 340 also includes a first enclosure wall 344 and a second enclosure wall, which are located at opposite ends of the sludge collection tank 340. The first enclosure wall 344 is connected to one end of the first inclined side wall 342 and the second inclined side wall 343. The first enclosure wall 344 extends into the water inlet cavity 311 and is connected to the inner side wall of the tank 310. The second enclosure wall is connected to the other end of the first inclined side wall 342 and the second inclined side wall 343. The second enclosure wall is located inside the drum assembly 320.

[0066] like Figure 9 As shown, the drum assembly 320 further includes a drum 321 and a filter screen 322. The drum 321 is rotatably disposed in the filter chamber 312. One end of the drum 321 is provided with an inlet 323 that communicates with the second inlet 313. The outer periphery of the drum 321 is provided with a plurality of water passage holes 324. The filter screen 322 covers the outer periphery of the drum 321. One end of the sludge collection tank 340 extends into the drum 321 through the inlet 323. The backwashing mechanism 330 is used to backwash the filter screen 322 of the drum assembly 320.

[0067] Specifically, the aquaculture wastewater in the inlet chamber 311 can flow into the rotating drum 321 through the inlet 323 at one end of the rotating drum 321. Under the centrifugal force and filtration action of the rotating drum 321, the aquaculture wastewater flowing into the rotating drum 321 is subjected to solid-liquid separation treatment. The solid pollutants separated in the aquaculture wastewater are trapped in the rotating drum 321, and the water separated in the aquaculture wastewater (i.e., clear liquid) flows out from the water passage 324 and filter screen 322 on the periphery of the rotating drum 321 and falls into the filter chamber 312 and finally flows out through the second outlet 314. The backwashing mechanism 330 is used to backwash the filter screen 322. The solid pollutants trapped on the filter screen 322, especially the solid pollutants trapped on the inner periphery of the filter screen 322, fall into the sludge collection tank 340 and then flow out through the drain pipe 341 to the outside of the box 310.

[0068] like Figure 9 As shown, a water passage 315 is provided between the water inlet chamber 311 and the filter chamber 312, and the water inlet 323 is connected to the water passage 315. The aquaculture wastewater in the water inlet chamber 311 can flow into the drum 321 in sequence through the water passage 315 and the water inlet 323.

[0069] like Figure 8As shown, the backwashing mechanism 330 further includes multiple backwashing nozzles 331 disposed above the drum assembly 320, a backwashing pipe 332 connected to the multiple backwashing nozzles 331, and a water pump 333. The water inlet end of the backwashing pipe 332 extends outside the housing 310, and the water pump 333 is disposed outside the housing 310, and the water pump 333 is connected to the water inlet end of the backwashing pipe 332 and the bottom of the filter chamber 312. During operation, the water at the bottom of the filter chamber 312 is lifted by the water pump 333 into the backwashing pipe 332, and finally sprayed out from the backwashing nozzles 331 to flush the drum assembly 320.

[0070] like Figure 8 As shown, the backwashing mechanism 330 further includes a transmission pipe 334, which is located outside the housing 310. Both ends of the transmission pipe 334 are connected to the bottom of the filter chamber 312 and the water pump 333, respectively. Water at the bottom of the filter chamber 312 can be transported to the water pump 333 via the transmission pipe 334 and then pumped into the backwashing pipe 332. Furthermore, the backwashing mechanism 330 also includes a filter 335, located at the inlet end of the backwashing pipe 332. This filter 335 filters the backwash water output from the filter chamber 312 to the backwashing pipe 332 to improve the cleanliness of the backwash water and prevent it from clogging the backwash nozzles 331.

[0071] like Figure 9 As shown, the housing 310 is further provided with a partition 316 to divide the housing 310 into a water inlet chamber 311 and a filter chamber 312, and a water passage 315 is provided on the partition 316.

[0072] like Figure 8 and Figure 11 As shown, in one embodiment, the bottom of the water inlet chamber 311 is provided with a drain pipe 317 for draining the water in the water inlet chamber 311. Further, the bottom of the filter chamber 312 is provided with a drain pipe 317 for draining the water in the filter chamber 312.

[0073] like Figure 9 As shown, the microfilter 300 further includes a drum drive mechanism 350, which drives the drum 321 to rotate. Specifically, in this embodiment, the drum drive mechanism 350 includes a motor 351, a drive gear 352, and a driven gear 353. The motor 351 is mounted on the side wall of the housing 310, and its power output end is connected to the drive gear 352, which is located inside the filter chamber 312. The driven gear 353 is located at the end of the drum 321 away from the inlet 323, and the drive gear 352 meshes with the driven gear 353. Specifically, the motor 351 drives the drive gear 352 to rotate, the drive gear 352 drives the driven gear 353 to rotate, and thus drives the drum 321 to rotate.

[0074] like Figure 11 As shown, to further ensure that the drum 321 can rotate stably, the microfilter 300 also includes a support shaft 360, which is disposed on the inner side wall of the filter chamber 312, and the drum 321 is rotatably disposed on the support shaft 360.

[0075] like Figure 12 and Figure 13 As shown, in one embodiment, the protein separator 400 includes a reaction chamber 410, a pump body 420, an air supply assembly 430, and a microbubble generating assembly 440. The top and bottom of the reaction chamber 410 are respectively provided with an inlet pipe 411 and an outlet pipe 412. The top of the reaction chamber 410 also has a foam outlet 413 located axially above the reaction chamber 410. The inlet and outlet of the pump body 420 are both connected to the bottom of the reaction chamber 410. The air supply assembly 430 is connected to the pump body 420 and is used to supply air to the water being pumped by the pump body 420, thereby increasing the gas content. Dissolved gas water is formed in the water transported by the pump body 420; the microbubble generating component 440 is disposed in the reaction chamber 410 and is located near the water outlet of the pump body 420; the microbubble generating component 440 includes a first porous plate 441, a second porous plate 443 and a cutting blade 442, the first porous plate 441 and the second porous plate 443 are arranged alternately from bottom to top along the height direction of the reaction chamber 410; the cutting blade 442 is rotatably disposed between the first porous plate 441 and the second porous plate 443, and both ends of the cutting blade 442 are rotatably connected to the first porous plate 441 and the second porous plate 443 respectively.

[0076] The aforementioned protein separator 400 and pump body 420 are connected to the reaction chamber 410 at both the inlet and outlet ends, allowing the aquaculture wastewater in the reaction chamber 410 to be drawn into the pump body 420. During the pumping process, the air supply component 430 supplies air to the water being pumped into the pump body 420, causing the gas to dissolve in the water to form dissolved air water. The air bubbles released from the dissolved air water enter the reaction chamber 410 through the bottom and flow upwards within the chamber. Simultaneously... The aquaculture wastewater to be treated enters the reaction chamber 410 through the inlet pipe 411 at the top of the reaction chamber 410 and flows from top to bottom inside the reaction chamber 410. During the process of contact between the aquaculture wastewater and the bubbles, the organic matter containing protein in the aquaculture wastewater will form foam. The foam will eventually be discharged through the foam outlet 413 at the top of the reaction chamber 410. The water separated from the aquaculture wastewater (i.e., clear liquid) is discharged to the outside through the outlet pipe 412 at the bottom of the reaction chamber 410, thereby completing the separation of organic matter and water in the aquaculture wastewater.

[0077] In this scheme, since the water outlet of the pump body 420 is located near the microbubble generating component 440, the water carrying bubbles sprayed from the liquid outlet of the pump body 420 can act on the microbubble generating component 440. During the rise of the bubbles, the bubbles pass through the three-stage cutting of the first porous plate 441, the cutting blade 442 and the second porous plate 443 of the microbubble generating component 440 in sequence, so that the released small bubbles can be divided into smaller and denser microbubbles. As the microbubbles rise, they become larger and have greater tension, which can increase their residence time in the water. This results in better contact with organic matter such as proteins in the aquaculture wastewater, making it easier to separate the water from the organic matter such as proteins. Furthermore, the microbubbles are not easy to break, preventing the attached or separated organic matter from returning to the water, effectively improving the separation effect of the protein separator 400.

[0078] like Figure 14 As shown, specifically, the first porous plate 441 is provided with a plurality of dividing holes 444 for bubbles to pass through. During the process of the bubbles passing through the dividing holes 444 on the first porous plate 441, the hole walls of the dividing holes 444 on the first porous plate 441 play a dividing role on the bubbles, so that the bubbles can be divided into a plurality of smaller bubbles.

[0079] After passing through the first porous plate 441, the bubble continues to rise and approach the cutting blade 442. Since the cutting blade 442 can rotate under the action of the airflow, the rotating cutting blade 442 can further divide this part of the bubble, so that the bubble can be divided into multiple small bubbles again.

[0080] The second porous plate 443 is provided with multiple dividing holes 444 for bubbles to pass through. After the bubbles pass through the cutting blades 442, they continue to rise and approach the second porous plate 443. During the process of the bubbles passing through the dividing holes 444 on the second porous plate 443, the hole walls of the dividing holes 444 on the second porous plate 443 again divide the bubbles, so that the bubbles can be divided into multiple small bubbles again. This makes the small bubbles rising to the top of the reaction chamber 410 smaller and denser, which is beneficial to improving the separation effect of the protein separator 400.

[0081] like Figure 13 As shown, in one embodiment, the protein separator 400 further includes a release tank 450, which is disposed inside the reaction chamber 410. The outlet end of the pump body 420 extends into the reaction chamber 410 and is connected to the bottom end of the release tank 450. The top end of the release tank 450 has a first opening 452. A first porous plate 441 is disposed at the first opening 452 of the release tank 450. A second porous plate 443 and a cutting blade 442 are both disposed outside the release tank 450.

[0082] Specifically, the dissolved air water sprayed from the outlet end of the pump body 420 enters the release tank 450. The bubbles released by the dissolved air water flow from bottom to top within the release tank 450 and are sequentially cut by a three-stage process involving a first perforated plate 441, a cutting blade 442, and a second perforated plate 443, thus breaking the bubbles into smaller and denser microbubbles. In this embodiment, the release tank 450 is coaxially arranged with the reaction chamber 410, and the bottom end of the release tank 450 has a second opening 454, which is sealed by the bottom wall of the reaction chamber 410.

[0083] like Figure 13 and Figure 14 As shown, the first perforated plate 441, the second perforated plate 443, and the cutting blade 442 are coaxially arranged. The outer diameter of the second perforated plate 443 is larger than the outer diameter of the first perforated plate 441. The outer diameter of the first perforated plate 441 matches the size of the opening 452 of the release tank 450 to achieve an adaptive assembly between the first perforated plate 441 and the release tank 450. The outer diameter of the second perforated plate 443 matches the size of the inner diameter of the reaction chamber 410 to achieve an adaptive assembly between the second perforated plate 443 and the reaction chamber 410.

[0084] like Figure 14 As shown, in one embodiment, to facilitate the assembly and disassembly of the second porous plate 443 and the reaction chamber 410, the outer edge of the second porous plate 443 is also provided with fixing holes 445 for detachably and fixedly connecting the second porous plate 443 and the reaction chamber 410. In one embodiment, the fixing holes 445 are arc-shaped holes, and there are multiple arc-shaped holes. The multiple arc-shaped holes are distributed at intervals along the circumference of the second porous plate 443 on its outer edge, and the dividing holes 444 on the second porous plate 443 are located in the area enclosed by the multiple arc-shaped holes. Specifically, the arc-shaped holes can be used to rivet the second porous plate 443 and the reaction chamber 410. By setting the fixing holes 445 to an arc shape, it is to prevent the second porous plate 443 from being unable to be smoothly installed in the reaction chamber 410 due to processing errors.

[0085] like Figure 14 As shown, furthermore, both ends of the cutting blade 442 are provided with connecting shafts 446, which are coaxially arranged and rotatably connected to the first perforated plate 441 and the second perforated plate 443, respectively. The outer diameter of the cutting blade 442 is between the outer diameter of the first perforated plate 441 and the outer diameter of the second perforated plate 443.

[0086] like Figure 12As shown, in one embodiment, the gas supply assembly 430 includes a Venturi tube 432. The air inlet end of the Venturi tube 432 is exposed to the outside, the water inlet end of the Venturi tube 432 is connected to the pump body 420, and the air outlet end of the Venturi tube 432 is connected to the reaction chamber 410. Specifically, the Venturi tube 432 has a natural air intake function, which can use the pressure difference generated by the liquid flow in the Venturi tube 432 to draw in external gas and input the drawn gas into the water conveyed by the pump body 420. This eliminates the need for additional electromechanical equipment such as fans and air pumps in the protein separator 400, and ensures that the dissolved air water output by the pump body 420 ultimately releases microbubbles, while effectively reducing the operating energy consumption of the protein separator 400.

[0087] Specifically, the pump body 420 has a water outlet pipe 421, and the water outlet end of the pump body 420 is located at the end of the water outlet pipe 421 away from the pump body 420. The water inlet end of the venturi tube 432 is connected to the water outlet pipe 421. The venturi tube 432 has a natural air intake function, which can use the pressure difference generated by the liquid flow in the venturi tube 432 to draw in external air and input the drawn air into the water body transported by the water outlet pipe 421 of the pump body 420 to form dissolved air water. The dissolved air water is input into the reaction chamber 410 through the air outlet end of the venturi tube 432 for subsequent bubble release.

[0088] like Figure 13 As shown, in one embodiment, the protein separator 400 further includes a water distribution component 460, which is disposed within the reaction chamber 410 and connected to the liquid inlet pipe 411 to improve the water distribution area and water distribution uniformity. In one embodiment, the water distribution component 460 includes a water distribution chamber 462, which is located above the second porous plate 443 and is coaxially arranged with the second porous plate 443. The bottom end of the water distribution chamber 462 is provided with a plurality of spaced water distribution holes 464.

[0089] like Figure 12 As shown, in one embodiment, the protein separator 400 further includes an exhaust pipe 470, which is connected to the liquid outlet pipe 412. Specifically, one end of the exhaust pipe 470 is connected to the liquid outlet pipe 412, and the other end of the exhaust pipe 470 extends upward. The exhaust pipe 470 is used to discharge the gas stagnating in the liquid outlet pipe 412 to avoid the problem of poor water flow due to gas stagnation in the liquid outlet pipe 412.

[0090] like Figure 12 and Figure 13 As shown, in one embodiment, the protein separator 400 further includes a transparent observation tube 480, which is connected to the side wall of the reaction chamber 410. Specifically, one end of the transparent observation tube 480 is connected to the side wall of the reaction chamber 410, and the other end of the transparent observation tube 480 extends upward. The transparent observation tube 480 is used for operators to observe the operation inside the reaction chamber 410.

[0091] like Figure 15 and Figure 16 As shown, in one embodiment, the biochemical water treatment equipment 500 further includes a reaction tank 530, a packing assembly 540, an aeration assembly 550, and a water distribution assembly 510. The packing assembly 540 and the aeration assembly 550 are both disposed in the reaction tank 530, with the aeration assembly 550 located below the packing assembly 540 and the water distribution assembly 510 extending into the reaction tank 530 and located above the packing assembly 540.

[0092] Specifically, the reaction tank 530 is preferably a circular reaction tank. The water distribution assembly 510 is used to uniformly distribute the aquaculture wastewater input into the reaction tank 530. The packing assembly 540 is used for the attachment and growth of microorganisms. The microorganisms are used to perform biochemical treatment on the aquaculture wastewater in the reaction tank 530 to remove pollutants such as ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen from the aquaculture wastewater. Preferably, the packing material in the packing assembly 540 is arranged at a high density to provide sufficient space for the attachment and growth of microorganisms. The aeration assembly 550 is used to oxygenate the aquaculture wastewater in the reaction tank 530 to provide oxygen for the microorganisms to decompose pollutants in the aquaculture wastewater. The aeration assembly 550 may include any one of an aeration disc and a micro / nano aeration module.

[0093] like Figures 17 to 19 As shown, the water distribution assembly 510 includes a water distribution cover 512, a water distribution weir 513, and multiple water distribution pipes 514. The water distribution cover 512 is rotatably sleeved on the outside of the outlet end of the inlet pipe body 520. The side wall of the water distribution cover 512 is provided with multiple water distribution ports 5121 along the circumferential direction. The water distribution weir 513 is disposed inside the water distribution cover 512 and can move up and down relative to the water distribution cover 512 along the height direction of the water distribution cover 512. The side wall of the water distribution weir 513 is provided with multiple weir openings 5131 that correspond one-to-one with the multiple water distribution ports 5121. The multiple water distribution pipes 514 are respectively connected to the corresponding multiple water distribution ports 5121. The side wall of each water distribution pipe 514 is provided with multiple water distribution holes 5141 that are spaced apart.

[0094] When the aforementioned water distribution assembly 510 is in operation, the aquaculture wastewater output from the outlet end of the inlet pipe 520 flows into the water distribution hood 512. Then, under the water distribution effect of the water distribution weir 513, it flows sequentially through the weir opening 5131 of the water distribution weir 513 and the water distribution outlet 5121 of the water distribution hood 512 into the water distribution pipe 514, and finally sprays out through the water distribution holes 5141 on the water distribution pipe 514. Under the reaction force of the water exiting the water distribution holes 5141 and the water distribution force of the water distribution weir 513 on each water distribution pipe 514, the water distribution pipe 514 and the water distribution... The water distribution cover 512 connected to the pipe 514 rotates relative to the inlet pipe body 520 to achieve uniform rotational water distribution of the water distribution assembly 510. Therefore, the water distribution assembly 510 of this application uses the reaction force of the water outlet 5141 and the combined force of the water distribution weir 513 on each water distribution pipe 514 to drive the water distribution pipe 514 to rotate and distribute water, thereby completing the rotational water distribution without the need for a power device. The water distribution is uniform, the structure is simple, the operating cost is low, and the adaptability is strong. It is especially suitable for water distribution in various circular reaction tanks.

[0095] It is understandable that the water distribution weir 513 can move up and down relative to the water distribution cover 512 along the height direction of the water distribution cover 512 by its own buoyancy in the water body inside the water distribution cover 512, or it can be moved up and down relative to the water distribution cover 512 along the height direction of the water distribution cover 512 by external components connected to the water distribution weir 513. There is no single limitation here.

[0096] like Figure 18 and Figure 20 As shown, in one embodiment, the water distribution assembly 510 further includes a connector 511, one end of which is connected to the outlet end of the water inlet pipe, and the other end of which is rotatably connected to the water distribution cover 512.

[0097] Specifically, when the water distribution assembly 510 is working, the aquaculture wastewater output from the outlet end of the inlet pipe 520 flows into the water distribution hood 512 through the connector 511. Then, under the water distribution effect of the water distribution weir 513, it flows sequentially through the weir opening 5131 of the water distribution weir 513 and the water distribution port 5121 of the water distribution hood 512 into the water distribution pipe 514, and finally sprays out through the water distribution hole 5141 on the water distribution pipe 514. Under the reaction force of the water exiting the water distribution hole 5141 and the water distribution force of the water distribution weir 513 on each water distribution pipe 514, the water distribution pipe 514 and the water distribution hood 512 connected to the water distribution pipe 514 rotate relative to the connector 511, so as to achieve uniform rotational water distribution of the water distribution assembly 510. Figure 2 and Figure 4As shown, in this embodiment, the connector 511, the water distribution weir 513, and the water distribution cover 512 are coaxially arranged. The water distribution cover 512 is rotatably sleeved on the outside of the top end of the connector 511, and the bottom end of the connector 511 is fixedly sleeved on the outside of the outlet end of the inlet pipe body 520. Specifically, the bottom end of the connector 511 and the outlet end of the inlet pipe body 520 are fixedly connected by an interference fit.

[0098] Understandably, due to the influence of gravity on water flow, if water enters the inlet pipe 520 from the top of the connector 511, it cannot be guaranteed that the inlet pipe 520 will be full of water, which will cause uneven water output from the various weirs 5131 of the distribution weir 513. Therefore, the bottom end of the connector 511 is fixedly connected to the outlet end of the inlet pipe 520, that is, water enters from the bottom end of the connector 511, so that the aquaculture wastewater output from the inlet pipe 520 can be evenly distributed through the multiple weirs 5131 in the circumferential direction of the distribution weir 513, ensuring that the water output from the distribution weir 513 is the same in all directions, thereby ensuring that the water output delivered to each distribution pipe 514 is uniform. Only when the water volume of each distribution pipe 514 is uniform can the entire water distribution assembly 510 be guaranteed to rotate in a balanced and uniform manner.

[0099] Specifically, in this embodiment, the water distribution weir 513 is in the shape of a frustum, and multiple weir openings 5131 are evenly spaced on the circumference of the water distribution weir 513, and multiple water distribution outlets 5121 are evenly spaced on the circumference of the water distribution cover 512.

[0100] like Figure 18 and Figure 20 As shown, the water distribution cover 512 further includes a small diameter portion 5122 and a large diameter portion 5123 connected sequentially from top to bottom. The diameter of the small diameter portion 5122 is smaller than the diameter of the large diameter portion 5123. The small diameter portion 5122 and the large diameter portion 5123 are coaxially arranged. The large diameter portion 5123 is rotatably sleeved on the outside of the outlet end of the water inlet pipe body 520. Specifically, the large diameter portion 5123 is rotatably sleeved on the outside of the connector 511. Multiple water distribution ports 5121 are arranged circumferentially on the large diameter portion 5123. The water distribution weir 513 is located inside the large diameter portion 5123.

[0101] like Figure 17 As shown, in one embodiment, to improve the uniformity of water distribution in the water distribution assembly 510, multiple water distribution pipes 514 are symmetrically distributed around the axis of the water distribution cover 512, and the multiple water distribution pipes 514 are radially and evenly distributed on the outer periphery of the water distribution cover 512. Figure 3 As shown, in one embodiment, in order to improve the water distribution uniformity of the water distribution assembly 510, a plurality of water distribution holes 5141 are evenly spaced along the length direction of the water distribution pipe 514 on the same side. Specifically, a plurality of water distribution holes 5141 are evenly spaced along the length direction of the water distribution pipe 514 on the bottom side of the water distribution pipe 514.

[0102] like Figure 17 As shown, in one embodiment, a plug 5142 is provided at the end of the water distribution pipe 514 away from the water outlet 5121. Figure 18 and Figure 20 As shown, in one embodiment, to facilitate adjustment of the height of the water distribution weir 513 to an optimal height corresponding to the water distribution state, the top of the water distribution cover 512 has an opening. Specifically, the top of the small diameter portion 5122 has an opening. The water distribution assembly 510 also includes a cover 515, which is disposed at the opening to open or close the opening. In one embodiment, the top of the cover 515 is also provided with a tool hole 5152 for easy removal of the cover 515. This tool hole 5152 can be, but is not limited to, a cross-shaped hole.

[0103] like Figure 18 and Figure 20 As shown, in one embodiment, the water distribution assembly 510 further includes an adjusting member 516, which is threadedly connected to the water distribution cover 512 and is used to abut the top of the water distribution weir 513. By rotating the adjusting member 516, the position of the adjusting member 516 in the height direction of the water distribution cover 512 can be adjusted, thereby adjusting the position of the water distribution weir 513 in the height direction of the water distribution cover 512.

[0104] Specifically, since the adjusting member 516 is threadedly connected inside the water distribution cover 512, rotating the adjusting member 516 can drive the adjusting member 516 to move axially relative to the water distribution cover 512, thereby adjusting the position of the adjusting member 516 in the height direction of the water distribution cover 512. Since the adjusting member 516 can abut against the top of the water distribution weir 513, when the position of the adjusting member 516 in the height direction of the water distribution cover 512 changes, the water distribution weir 513 can adaptively adjust to the height position corresponding to the adjusting member 516 under its own buoyancy and the limiting action of the adjusting member 516 (or when the adjusting member 516 is connected to the top of the water distribution weir 513, the water distribution weir 513 is directly driven by the adjusting member 516), so as to adjust the water distribution weir 513 to the height position corresponding to the optimal water distribution state.

[0105] In this embodiment, the adjusting member 516 may be, but is not limited to, a screw. A support platform 5124 is formed inside the water distribution cover 512. The adjusting member 516 passes through the support platform 5124 and is threadedly connected to the support platform 5124. One end of the adjusting member 516 is used to abut the top of the water distribution weir 513. Specifically, a support platform 5124 is formed inside the small diameter portion 5122. One end of the adjusting member 516 is located inside the small diameter portion 5122, and the other end of the adjusting member 516 extends into the large diameter portion 5123.

[0106] like Figure 15As shown, in one embodiment, the biochemical water treatment equipment 500 further includes a drain pipe 560, which is disposed at the bottom end of the reaction tank 530. The drain pipe 560 is used to discharge the aquaculture wastewater in the reaction tank 530 after biochemical treatment by the packing assembly 540. Specifically, the outlet end of the inlet pipe 520 extends to the top of the reaction tank 530, the water distribution assembly 510 is located at the top of the reaction tank 530, and the drain pipe 560 is disposed at the bottom of the reaction tank 530. That is, the biochemical water treatment equipment 500 of this application adopts a top-inlet and bottom-outlet water flow method.

[0107] like Figure 16 As shown, in one embodiment, a filter structure 570 is provided at the connection between the drain pipe 560 and the reaction tank 530. The filter structure 570 may include, but is not limited to, a bar screen. The filter structure 570 is used to filter the aquaculture wastewater after biochemical treatment by the packing assembly 540 before discharge, so as to remove sludge from the effluent. This not only improves the quality of the effluent, but also avoids clogging of the drain pipe 560 due to excessive sludge concentration in the effluent.

[0108] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A recirculating aquaculture system, characterized in that, include: The system includes an aquaculture pond, a solid-liquid separation device, an elevator, a protein separator, a biochemical water treatment device, and a reflux unit. The aquaculture pond, the solid-liquid separation device, the elevator, the protein separator, and the biochemical water treatment device are arranged sequentially along the water inlet direction. The reflux unit is connected to the biochemical water treatment device and the aquaculture pond. The solid-liquid separation equipment is used to remove solid pollutants from the aquaculture wastewater discharged from the aquaculture pond; The elevator is used to pressurize and lift the aquaculture wastewater treated by the solid-liquid separation equipment into the protein separator; The protein separator is used to remove protein-containing organic matter from the aquaculture wastewater; The biochemical water treatment equipment is used to treat the aquaculture wastewater using biochemical methods. The reflux unit is used to return the aquaculture wastewater treated by the biochemical water treatment equipment to the aquaculture pond.

2. The recirculating aquaculture system according to claim 1, characterized in that, The solid-liquid separation equipment includes a solid-liquid separation device and a microfilter arranged sequentially along the water inlet direction; The solid-liquid separation device is used to remove heavy solid pollutants from the aquaculture wastewater discharged from the aquaculture pond; The microfilter is used to remove light, fine solid pollutants from the aquaculture wastewater.

3. The recirculating aquaculture system according to claim 2, characterized in that, The number of the breeding ponds is at least two, and the at least two breeding ponds include a first breeding pond and a second breeding pond, wherein the second breeding pond is used to raise a portion of the cultured organisms separated from the first breeding pond. The first aquaculture pond, the solid-liquid separation device, the microfilter, the elevator, the protein separator, and the biochemical water treatment equipment are arranged sequentially along the water inlet direction, and the reflux unit is connected to the biochemical water treatment equipment and the first aquaculture pond; The second aquaculture pond, the microfilter, the elevator, the protein separator, and the biochemical water treatment equipment are arranged sequentially along the water inlet direction, and the reflux unit is connected to the biochemical water treatment equipment and the second aquaculture pond.

4. The recirculating aquaculture system according to claim 2, characterized in that, The solid-liquid separation device includes: A housing, wherein a first water inlet and a first water outlet are provided on the side wall of the housing, the first water inlet being located above the first water outlet; and A filter element is disposed inside the housing, and the top and bottom of the filter element are respectively provided with a first opening and a second opening; The aquaculture wastewater can flow into the shell through the first inlet and into the filter element through the first opening. Under the solid-liquid separation action of the filter element, the water separated from the aquaculture wastewater can flow out of the filter element through the filter holes on the periphery of the filter element and then flow out of the shell through the first outlet; and the solid pollutants separated from the aquaculture wastewater can be discharged from the filter element through the second opening and settle to the bottom of the shell.

5. The recirculating aquaculture system according to claim 2, characterized in that, The microfiltration unit includes: The housing is divided into an inlet chamber and a filter chamber. A second inlet and a second outlet are provided on the side wall of the housing. The second inlet is connected to the inlet chamber and the second outlet is connected to the filter chamber. A rotating drum assembly is rotatably disposed within the filter chamber, with one end of the rotating drum assembly connected to the water inlet chamber; A backwashing mechanism is used to backwash the drum assembly; and A sludge collection trough, one end of which is disposed inside the rotating drum assembly, and the other end of which extends out of the rotating drum assembly and extends to the water inlet cavity and connects to the inner side wall of the housing, and the sludge collection trough does not rotate with the rotating drum assembly.

6. The recirculating aquaculture system according to claim 2, characterized in that, The protein separator includes: The reaction chamber is provided with an inlet pipe and an outlet pipe at its top and bottom, respectively, and a foam outlet is also provided at the top of the reaction chamber. The pump body, with both its inlet and outlet ends connected to the bottom of the reaction chamber; An air supply assembly is connected to the pump body; the air supply assembly is used to supply air to the water being pumped by the pump body, so that the gas dissolves in the water being pumped by the pump body to form dissolved air water; and A microbubble generating component is disposed within the reaction chamber and near the water outlet of the pump body; the microbubble generating component includes a first porous plate, a second porous plate, and a cutting blade, wherein the first porous plate and the second porous plate are arranged alternately from bottom to top along the height direction of the reaction chamber; the cutting blade is rotatably disposed between the first porous plate and the second porous plate, and both ends of the cutting blade are rotatably connected to the first porous plate and the second porous plate, respectively.

7. The recirculating aquaculture system according to claim 1, characterized in that, The biochemical water treatment equipment includes a reaction tank, a packing assembly, an aeration assembly, and a water distribution assembly. The packing assembly and the aeration assembly are both disposed in the reaction tank, with the aeration assembly located below the packing assembly. The water distribution assembly extends into the reaction tank and is located above the packing assembly.

8. The recirculating aquaculture system according to claim 7, characterized in that, The water distribution assembly includes: A water distribution cover is used to rotate and be fitted on the outside of the water outlet end of the water inlet pipe. The side wall of the water distribution cover is provided with multiple water outlets along the circumference. A water distribution weir, disposed within the water distribution hood, is movable vertically relative to the water distribution hood along its height. The sidewall of the weir is provided with multiple weir openings corresponding one-to-one with the multiple water distribution outlets. Multiple water distribution pipes are connected to corresponding multiple water outlets, and each water distribution pipe has multiple water distribution holes spaced apart on its side wall.

9. The recirculating aquaculture system according to claim 1, characterized in that, The recirculating aquaculture system also includes an ultraviolet sterilizer, which is located between the elevator and the protein separator.

10. The recirculating aquaculture system according to claim 1, characterized in that, The recirculating aquaculture system also includes at least one of a workbench and an electrical control cabinet, the electrical control cabinet being used to control the operation of each piece of equipment in the recirculating aquaculture system.

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