Aquaculture tail water treatment device

Abstract

The invention discloses an aquaculture tail water treatment device and belongs to the technical field of tail water treatment, the bottom of a culture pond is conical and provided with an adjusting hole penetrating through the bottom, an in-pond sewage suction pipe is close to the bottom and extends upwards, and the side face of the in-pond sewage suction pipe is connected with a sewage discharge pipe. A conical adjusting block and a lifting device are arranged between the adjusting hole and the sewage suction pipe, the distance between the adjusting hole and the sewage suction pipe can be adjusted, the suction force of the sewage suction pipe is changed according to the Bernoulli principle, layered cleaning is achieved, a water outlet of the sewage discharge pipe is communicated with the primary sedimentation tank through a flow guide pipe inclining downwards, a water disturbing impeller is arranged at the water outlet, water flow rotates in one direction, and sewage accumulation is avoided. A biological filter dam is arranged in the middle of the primary sedimentation tank, and a filter cavity is formed in the dam, so that dirt can be isolated, water is purified, water quality is improved, and the water is more suitable for survival or cyclic utilization of cultured organisms. The device is reasonable in overall structure and capable of effectively treating aquaculture tail water and maintaining a good aquaculture environment.

Description

Technical Field

[0001] The invention relates to the technical field of tail water treatment, in particular to an aquaculture tail water treatment device. Background Art

[0002] In the process of expanding the scale and intensive development of aquaculture, the problem of aquaculture tailwater has become prominent. The utilization rate of feed feeding is limited, and residual feed causes an increase in organic matter and nutrients in the water, causing eutrophication; the excrement of aquaculture organisms contains nitrogen and phosphorus compounds, which are converted into toxic substances that harm aquatic organisms under certain conditions; drugs remain in the water after use, destroying microbial communities and threatening human health; the bottom sediment releases harmful substances when there is a lack of oxygen, causing the water body to deteriorate. The direct discharge of tailwater into natural water bodies will cause eutrophication of water bodies, algae outbreaks, ecological imbalance, biological death, and pollution of the soil and surrounding environment. For aquaculture itself, bad tailwater affects the growth and health of aquaculture organisms, and due to stricter environmental protection regulations, the treatment of tailwater has become a necessity for compliant operations, so there is an urgent need for aquaculture tailwater treatment technology to promote the coordinated development of the industry and the environment.

[0003] In the current aquaculture process, residual feed, excrement of aquaculture organisms, and some colloidal substances settle to the bottom to form sediments, and the substances settled to the bottom are often difficult to clean. Summary of the invention

[0004] The purpose of the present invention is to provide an aquaculture tailwater treatment device to solve the problem that residual feed, excrement of aquaculture organisms and some colloidal substances in the existing aquaculture process settle to the bottom to form sediments, and the substances settled to the bottom are often difficult to clean.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: comprising a culture pond, a water pipe for conveying water into the culture pond, and a primary sedimentation tank connected to the culture pond, wherein the primary sedimentation tank is lower than the culture pond, the bottom of the culture pond is a conical structure, and the bottom of the culture pond is provided with an adjustment hole penetrating the bottom of the culture pond, the culture pond is provided with a sewage suction pipe close to the bottom of the culture pond and extending upward along the center of the bottom surface of the culture pond, the interior of the sewage suction pipe is a hollow structure penetrating from the top to the bottom, the side of the sewage suction pipe is connected with a sewage discharge pipe extending out of the culture pond, a conical adjustment block is provided between the adjustment hole and the sewage suction pipe, the bottom of the conical adjustment block is provided with a lifting device for pushing the conical adjustment block to rise and fall, and for adjusting the distance between the conical adjustment block and the bottom of the sewage suction pipe, the water outlet on the sewage discharge pipe is provided with a guide pipe inclined downwardly and connected to the primary sedimentation tank, the water outlet of the guide pipe is provided with a water disturbance impeller, and the middle of the primary sedimentation tank is provided with a biological filtration dam, and a filter cavity is provided in the biological filtration dam.

[0006] Furthermore, the lifting device includes a supporting guide rail arranged in the adjusting hole and a supporting slide rod arranged in the supporting guide rail and connected to the bottom of the conical adjusting block, the supporting slide rod is provided with a lifting gear, and a driving gear meshing with the lifting gear and an adjusting rod for driving the driving gear to rotate are provided under the breeding pond.

[0007] Furthermore, a leak-proof cover is provided at the bottom of the breeding pond above the adjusting hole, the supporting slide rod passes through the leak-proof cover, and a flexible water-blocking cover is provided on the supporting slide rod between the leak-proof cover and the conical adjusting block.

[0008] Furthermore, the bottom surface of the breeding pond is provided with a plurality of circumferential grooves in the radial direction, and an agitation mechanism is installed in the circumferential grooves so that the sludge at the bottom of the pond flows to the sludge discharge pipe, and the agitation mechanism includes an elastic layer, a mounting pipe, and connecting air holes, wherein the mounting pipe is embedded in the circumferential groove, the top surface of the mounting pipe is a plane, and a plurality of connecting air holes are opened on the top surface of the mounting pipe, and the elastic layer is coated on the top surface of the mounting pipe to form an air cavity, and the air cavity is connected to all the connecting air holes, and the air cavity is connected to an external air source.

[0009] Furthermore, the installation tube has an air inlet and an air outlet, the external air source is an aeration air pump connected to the air inlet, and the air outlet is equipped with an air outlet one-way valve.

[0010] Furthermore, the gas outlet one-way valve includes a connecting pipe connected to the gas outlet, a spring is arranged inside the connecting pipe and a sealing sheet is arranged at an outer end of the connecting pipe, and the sealing sheet is connected to the spring.

[0011] Furthermore, the biological filtration dam includes an outermost filter plate, a filter material supporting layer arranged in the filter plate, and a porous biological filter material layer arranged in the filter material supporting layer.

[0012] Furthermore, the biological filtration dam also includes a single-pore membrane aeration pipe located in the porous biological filter material layer.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The bottom of the breeding pond is designed to be a conical structure, the purpose of which is to allow various impurities and dirt generated in the pond to naturally gather to the lowest point at the bottom under the action of gravity. The sewage suction pipe is close to the bottom of the breeding pond and extends upward along the center of the bottom circle. Its interior is a hollow structure that runs from the top to the bottom. Because it is close to the bottom and is in an area where impurities are easily collected, when there is water in the breeding pond and the water level difference exceeds that of the sewage pipe,

[0015] According to the overflow principle, in this process, the impurities settled at the bottom of the breeding pond will flow along the water close to the bottom opening of the suction pipe, and then be guided upward along the hollow channel inside the suction pipe. The side of the suction pipe is connected to the sewage pipe extending out of the breeding pond. When water containing impurities and dirt gathers in the suction pipe, the sewage can be discharged out of the breeding pond through the sewage pipe, thereby extracting and cleaning the impurities and dirt settled at the bottom of the breeding pond, thereby achieving the effect of cleaning the dirt in the breeding pond and maintaining a good breeding environment.

[0016] 2. An adjustment hole penetrating the bottom of the breeding pool is provided at the bottom of the breeding pool. A conical adjustment block and a lifting device that can be extended into the breeding pool can be provided at the bottom of the breeding pool through the adjustment hole. The conical adjustment block is aligned with the bottom of the sewage suction pipe. The height of the conical adjustment block is adjusted by the lifting device to change the gap between the circumference of the conical adjustment block and the bottom of the sewage suction pipe. By using the Bernoulli principle, the smaller the distance between the circumference of the conical adjustment block and the bottom of the sewage suction pipe, that is, the smaller the distance between the channel where the water flows into the reverse suction pipe, the faster the flow speed of the water around the bottom of the sewage suction pipe is, thereby strengthening the suction force formed at the bottom of the sewage suction pipe. On the contrary, the larger the distance between the circumference of the conical adjustment block and the bottom of the sewage suction pipe, the larger the distance between the channel where the water flows into the sewage suction pipe. The distance becomes smaller and the water flow speed becomes slower, which reduces the suction formed at the bottom of the suction pipe. The adjustable suction design can realize gradual and layered cleaning. The smaller suction can first suck away the relatively loose and easily moved dirt in the upper layer, avoiding the violent disturbance of the entire breeding pond water body caused by one-time strong suction, and preventing the unprecipitated dirt from being re-suspended in the water, affecting the clarity of the water quality and the normal life of the farmed organisms. As the cleaning process progresses, the distribution of dirt at the bottom of the breeding pond gradually becomes loose. At this time, the suction can be increased to further clean the heavy dirt at the bottom that cannot be sucked up by small suction. Such a step-by-step cleaning method can efficiently handle a large amount of dirt while ensuring the stability of the breeding environment.

[0017] 3. The primary sedimentation tank is used to completely separate pollution from the water body. The water with dirt discharged from the breeding pond is introduced into the primary sedimentation tank through the diversion pipe. There is a biological filtration dam in the middle of the primary sedimentation tank. The dirt is isolated in the primary sedimentation tank by the biological filtration dam, and the evolved water will enter the filter chamber through the biological filtration dam, thereby realizing the fine purification of water quality, significantly improving the water quality in a short time, effectively removing odor and color, making the water body clearer and more transparent, and more suitable for the survival of breeding organisms or subsequent recycling.

[0018] 4. At the same time, a water disturbance impeller is provided at the outlet of the guide pipe, which can disturb the water body so that the water entering the primary sedimentation tank flows in one direction, so that the water in the primary sedimentation tank rotates continuously, avoiding the complete sedimentation of dirt at the outlet of the guide pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of an aquaculture tailwater treatment device of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the lifting device of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the conical adjustment block of the present invention;

[0023] Figure 4 For the present invention Figure 3 The enlarged schematic diagram of point A in the middle;

[0024] Figure 5 It is a schematic diagram of the structure of the installation tube and the elastic layer of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the biological filtration dam of the present invention;

[0026] Figure 7 It is a top view of the breeding pond of the present invention.

[0027] In the figure: 1 breeding pond, 11 regulating hole, 12 leakproof cover, 13 circumferential groove, 2 water pipe, 3 primary sedimentation tank, 31 biological filtration dam, 4 sewage suction pipe, 5 sewage discharge pipe, 6 conical regulating block, 7 lifting device, 71 supporting guide rail, 72 supporting slide bar, 73 lifting gear, 74 driving gear, 75 regulating rod, 76 flexible water blocking cover, 8 guide pipe, 14 water disturbing impeller, 8 agitation mechanism, 81 elastic layer, 82 mounting pipe, 84 air cavity, 85 agitation air pump, 86 air outlet check valve, 861 spring, 862 sealing sheet, 9 biological filtration dam, 91 filter plate, 92 filter material supporting layer, 93 porous biological filter material layer, 94 single-hole membrane aeration pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0030] Embodiment 1;

[0031] like Figures 1 to 7As shown, the present invention provides an aquaculture tailwater treatment device, comprising a culture pond 1, a water pipe 2 for conveying water into the culture pond 1, and a primary sedimentation tank 3 connected to the culture pond 1, wherein the primary sedimentation tank 3 is lower than the culture pond 1, the bottom of the culture pond 1 is a conical structure, and the bottom of the culture pond 1 is provided with an adjustment hole 11 penetrating the bottom of the culture pond 1, the culture pond 1 is provided with a sewage suction pipe 4 close to the bottom of the culture pond 1 and extending upward along the center of the bottom surface of the culture pond 1, the interior of the sewage suction pipe 4 is a hollow structure penetrating from the top to the bottom, and the sewage suction pipe 4 A sewage pipe 5 extending out of the breeding pond 1 is connected to the side thereof, a conical adjusting block is provided between the adjusting hole 11 and the sewage suction pipe 4, a lifting device 7 is provided at the bottom of the conical adjusting block 6 for pushing the conical adjusting block 6 up and down and for adjusting the distance between the conical adjusting block 6 and the bottom of the sewage suction pipe 4, a water outlet on the sewage pipe 5 is provided with a guide pipe 8 inclined downward and connected to the primary sedimentation tank 3, a water disturbing impeller 14 is provided at the water outlet of the guide pipe 8, a biological filtration dam 931 is provided in the middle of the primary sedimentation tank 3, and a filtration chamber is provided in the biological filtration dam 931.

[0032] The bottom of the culture pond 1 is hollowed out, and the bottom of the culture pond 1 is designed to be a conical structure, the purpose of which is to allow various impurities and dirt generated in the pond to naturally gather at the lowest point of the bottom under the action of gravity. The sewage suction pipe 4 is close to the bottom of the culture pond 1 and extends upward along the center of the bottom circle, and its interior is a hollow structure that runs from the top to the bottom. Because it is close to the bottom and is in an area where impurities are easily gathered, when there is water in the culture pond 1 and the water level difference exceeds the sewage discharge pipe 5, according to the overflow principle, in this process, the impurities deposited at the bottom of the culture pond 1 will approach the bottom opening of the sewage suction pipe 4 along the water flow, and then can be guided upward along the hollow channel inside the sewage suction pipe 4. The sewage suction pipe 4 is connected to the sewage discharge pipe 5 extending out of the culture pond 1. When the water flow containing impurities and dirt is gathered in the sewage suction pipe 4, these sewage can be discharged out of the culture pond 1 through the sewage discharge pipe 5, so as to realize the extraction and cleaning of the impurities and dirt deposited at the bottom of the culture pond 1, thereby achieving the effect of cleaning the dirt in the culture pond 1 and maintaining a good culture environment.

[0033] The bottom of the culture pond 1 is provided with an adjustment hole 11 which runs through the bottom of the culture pond 1. Through the adjustment hole 11, a conical adjustment block 6 and a lifting device 7 which can be extended into the culture pond 1 can be provided at the bottom of the culture pond 1. The maximum diameter of the conical adjustment block 6 is larger than the inner diameter of the sewage suction pipe 4, and the minimum diameter of the conical adjustment block 6 is one-third of the inner diameter of the sewage suction pipe 4. The conical adjustment block 6 is aligned with the bottom of the sewage suction pipe 4. The height of the conical adjustment block 6 is adjusted by the lifting device 7 to change the gap between the circumference of the conical adjustment block 6 and the bottom of the sewage suction pipe 4. By using the Bernoulli principle, the smaller the gap between the circumference of the conical adjustment block 6 and the bottom of the sewage suction pipe 4, that is, the smaller the channel spacing of the water flow into the reverse suction pipe 4, the faster the flow speed of the water flow around the bottom of the sewage suction pipe 4 is, so that the suction force formed at the bottom of the sewage suction pipe 4 is strengthened, and on the contrary, the conical adjustment block 6 is adjusted to a certain height. The distance between the circumference of the shaped adjustment block 6 and the bottom of the sewage suction pipe 4 becomes larger, the channel distance of the water flowing into the sewage suction pipe 4 becomes smaller, and the water flow speed slows down, so that the suction formed at the bottom of the sewage suction pipe 4 is reduced. The adjustable suction design can realize gradual and layered cleaning. The smaller suction can first suck away the relatively loose and easily driven dirt in the upper layer, avoiding the violent disturbance of the water body of the entire breeding pond 1 due to a one-time strong suction, and preventing the unprecipitated dirt from being re-suspended in the water, affecting the clarity of the water quality and the normal life of the cultured organisms. As the cleaning process proceeds, the dirt distribution at the bottom of the breeding pond 1 gradually becomes loose. At this time, the suction can be increased to further clean the bottom dirt that is heavy and cannot be sucked up by the small suction. Such a step-by-step cleaning method can efficiently handle a large amount of dirt while ensuring the stability of the breeding environment.

[0034] The primary sedimentation tank 3 is used to completely separate the pollution from the water body. The water body with dirt discharged from the breeding pond 1 is introduced into the primary sedimentation tank 3 through the diversion pipe 8. A biological filtration dam 931 is provided in the middle of the primary sedimentation tank 3. The dirt is isolated in the primary sedimentation tank 3 by the biological filtration dam 931, and the evolved water will enter the filter chamber through the biological filtration dam 931, thereby realizing the fine purification of the water quality, significantly improving the water quality in a short time, effectively removing odor and color, making the water body clearer and more transparent, and more suitable for the survival of farmed organisms or subsequent recycling; at the same time, a water disturbance impeller 14 is provided at the outlet of the diversion pipe 8, which can disturb the water body so that the water entering the primary sedimentation tank 3 flows in one direction, so that the water in the primary sedimentation tank 3 rotates continuously, avoiding the complete precipitation of dirt at the outlet of the diversion pipe 8.

[0035] The lifting device 7 includes a cylindrical support rail 71, a slide rail and a slider are arranged on the inner side of the support rail 71, and a support slide bar 72 is installed on the slider to enable the support slide bar 72 to slide on the support rail 71. The top of the support slide bar 72 is fixedly supported on the bottom of the conical adjustment block 6. A lifting gear 73 is arranged on the circumference of the support slide bar 72. At the same time, a gear mounting groove is provided on the side of the support rail 71. A driving gear 74 is installed under the breeding pond 1 through a bearing seat. The driving gear 74 is connected to the lifting gear 73 through the gear mounting groove. The drive gear 74 is meshed, and an adjusting rod 75 is connected to the drive gear 74. The adjusting rod 75 extends from the bottom of the culture pond 1 to the outside of the culture pond 1. A bearing seat fixed to the bottom is also provided at the outermost end of the adjusting rod 75, so that the driving gear 74 can be rotated by rotating the adjusting rod 75. The rotating driving gear 74 can drive the supporting slide bar 72 to rise and fall by meshing with the lifting gear 73, so that the reduction between the conical adjusting block 6 and the bottom of the sewage suction pipe 4 can be adjusted on the outside of the culture pond 1, thereby changing the suction force of the overflow suction.

[0036] A leakproof cover 12 is provided at the bottom of the breeding pond 1 above the adjusting hole 11, the supporting slide bar 72 passes through the leakproof cover 12, and a flexible water-blocking cover 76 is provided on the supporting slide bar 72 between the leakproof cover 12 and the conical adjusting block 6; the leakproof cover 12 is made of steel material, and the leakproof cover 12 is also a conical structure, and the middle of the leakproof cover 12 has an opening adapted to the supporting slide bar 72, the supporting slide bar 72 passes through the leakproof cover 12 and is connected to the conical adjusting block 6, the flexible water-blocking cover 76 is installed on the supporting slide bar 72 and is located on the conical adjusting block 6 and the leakproof cover 12, and the flexible water-blocking cover 76 covers the circumference of the leakproof cover 12 and can slide on the circumference of the leakproof cover 12, the flexible water-blocking cover 76 is located at the bottom of the breeding pond 1, and can remain in contact with the circumference of the leakproof cover 12 under the water pressure of the water body at the bottom of the breeding pond 1, thereby effectively preventing water from leaking from the bottom of the breeding pond 1.

[0037] Embodiment 2;

[0038] In order to facilitate the sludge discharge and enable the sludge to be gathered in the sludge discharge pipe, the bottom surface of the culture pond 1 is provided with a plurality of circumferential grooves 13 in the radial direction, and an agitation mechanism 8 is installed in the circumferential groove 13, so that the sludge at the bottom of the pond flows to the sludge discharge pipe, and the agitation mechanism 8 includes an elastic layer 81, a mounting pipe 82, and connecting air holes, wherein the mounting pipe 82 is embedded in the circumferential groove 13, the top surface of the mounting pipe 82 is a plane, and a plurality of connecting air holes are opened on the top surface of the mounting pipe 82, and the elastic layer 81 is coated on the top surface of the mounting pipe 82 to form an air cavity 84, and the air cavity 84 is connected to all the connecting air holes. And the air cavity 84 is connected to the external air source; the mounting tube 82 and the elastic member are made of one piece. When the mounting tube 82 is embedded in the circumferential groove 13, the plane of the mounting tube 82 is just parallel to the circumferential surface of the breeding pond 1, and the elastic layer 81 is located above the circumferential surface of the breeding pond 1, which prevents dirt from settling in the gap between the mounting tube 82 and the circumferential groove 13. When the external air source intermittently inflates and deflates the elastic layer 81, the size of the elastic layer 81 changes intermittently. At this time, the sludge at the bottom of the pool can continue to flow, and thus, under the dual effects of gravity and the agitation mechanism 8, it continues to converge to the sludge discharge pipe.

[0039] The mounting tube 82 has an air inlet and an air outlet, the external air source is an agitation air pump 85 connected to the air inlet, and the air outlet is installed on an air outlet check valve 86; the agitation air pump 85 is connected to the air inlet of the mounting tube 82, and indirectly supplies gas to the cavity formed by the mounting tube 82 and the elastic layer 81, so that the elastic layer 81 is agitated, and an air outlet check valve 86 is installed at the air outlet. When the agitation air pump 85 inputs indirect gas, the air outlet check valve 86 also performs indirect exhaust along with the input of intermittent gas, thereby avoiding the deterioration of the agitation effect after the cavity is filled with gas.

[0040] The air outlet one-way valve 86 includes a connecting pipe connected to the air outlet, in which a spring 861 and a sealing sheet 862 are arranged at the outer port of the connecting pipe, and the sealing sheet 862 is connected to the spring 861; the elasticity of the spring 861 always allows the sealing sheet 862 to keep the outer port of the connecting pipe sealed, thereby avoiding excessive leakage of the cavity and poor agitation effect.

[0041] The biological filter dam 931 includes the outermost filter plate 91 and the filter material support layer 92 arranged in the filter plate 91 and the porous biological filter material layer 93 arranged in the filter material support layer 92; the filter plate 91 is made of stainless steel or high-strength engineering plastic material, and is cast into a cylindrical frame as the outermost structure of the biological filter dam 931. The filter plate 91 plays a role in initially intercepting larger particles of dirt, preventing them from directly impacting the internal filter material support layer 92 and the porous biological filter material layer 93, and protecting the structural integrity of the internal filter material. Its evenly distributed filter holes can make the water body flow into the biological filter dam 931 more evenly, avoid the short-circuit phenomenon of water flow, and ensure that the entire biological filter dam 931 can fully play the role of filtering and purifying; the filter material support layer 92 is selected from gravel and ceramsite with certain strength and porosity, and its main function is to support the porous biological filter material layer 93, so that it maintains a stable position and structure in the biological filter dam 931, and avoids displacement or uneven accumulation of the filter material under the action of water flow. It can evenly disperse the water flow pressure, so that the water flow evenly passes through the porous biological filter material layer 93, thereby improving the efficiency of filtration and biological purification; the porous biological filter material layer 93 adopts common porous biological filter materials such as volcanic rock, zeolite, activated carbon, etc., and its material has the characteristics of porous structure, large specific surface area, light texture and rich in various mineral elements. It can provide a large number of attachment sites for microorganisms and promote the reproduction and growth of microorganisms. In addition, its own mineral components can chemically react with harmful substances in the water to a certain extent, thereby playing a role in adsorbing and removing pollutants.

[0042] The biological filtration dam 931 also includes a single-hole membrane aeration pipe 94 located in the porous biological filter material layer 93; the single-hole membrane aeration pipe 94 located in the porous biological filter material layer 93 can increase the dissolved oxygen content in the water by aerating the water. Sufficient dissolved oxygen is essential for the growth and reproduction of microorganisms in the biological filtration dam 931, and it can promote the metabolic activities of aerobic microorganisms and enable them to decompose organic pollutants more efficiently.

[0043] The above contents are some specific implementation modes of the present invention and do not limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An aquaculture tailwater treatment device, comprising a culture pond, a water pipe for conveying water into the culture pond, and a primary sedimentation tank connected to the culture pond, wherein the primary sedimentation tank is lower than the culture pond, characterized in that: The bottom of the breeding pond is a conical structure, and the bottom of the breeding pond is provided with an adjustment hole that passes through the bottom of the breeding pond. A sewage suction pipe close to the bottom of the breeding pond and extending upward along the center of the bottom of the breeding pond is provided in the breeding pond. The interior of the sewage suction pipe is a hollow structure that passes through the bottom from the top. The side of the sewage suction pipe is connected to a sewage discharge pipe extending out of the breeding pond. A conical adjustment block is provided between the adjustment hole and the sewage suction pipe. The bottom of the conical adjustment block is provided with a lifting device that pushes the conical adjustment block to rise and fall and is used to adjust the distance between the conical adjustment block and the bottom of the sewage suction pipe. The water outlet on the sewage discharge pipe is provided with a guide pipe that is inclined downward and connected to the primary sedimentation tank. The water outlet of the guide pipe is provided with a water disturbing impeller. A biological filtration dam is provided in the middle of the primary sedimentation tank, and a filter cavity is provided in the biological filtration dam.

2. The aquaculture tailwater treatment device according to claim 1, characterized in that: The lifting device includes a support rail arranged in the adjustment hole and a support slide rod arranged in the support rail and connected to the bottom of the conical adjustment block. A lifting gear is provided on the support slide rod. A driving gear meshing with the lifting gear and an adjustment rod for driving the driving gear to rotate are provided under the breeding pond.

3. The aquaculture tailwater treatment device according to claim 2, characterized in that: A leakproof cover is provided at the bottom of the culture pond above the adjusting hole, the supporting slide rod passes through the leakproof cover, and a flexible water-blocking cover is provided on the supporting slide rod between the leakproof cover and the conical adjusting block.

4. The aquaculture tailwater treatment device according to claim 1, characterized in that: The bottom surface of the breeding pond is provided with a plurality of circumferential grooves in the radial direction, and an agitation mechanism is installed in the circumferential grooves so that the sludge at the bottom of the pond flows to the sludge discharge pipe, and the agitation mechanism includes an elastic layer, a mounting pipe, and connecting air holes, wherein the mounting pipe is embedded in the circumferential groove, the top surface of the mounting pipe is a plane, and a plurality of connecting air holes are opened on the top surface of the mounting pipe, the elastic layer is coated on the top surface of the mounting pipe to form an air cavity, and the air cavity is connected to all the connecting air holes, and the air cavity is connected to an external air source.

5. The aquaculture tailwater treatment device according to claim 4, characterized in that: The installation pipe has an air inlet and an air outlet, the external air source is an agitation air pump connected to the air inlet, and the air outlet is installed on an air outlet one-way valve.

6. The aquaculture tailwater treatment device according to claim 5, characterized in that: The gas outlet one-way valve comprises a connecting pipe connected to the gas outlet, a spring is arranged in the connecting pipe and a sealing sheet is arranged at the outer end of the connecting pipe, and the sealing sheet is connected to the spring.

7. The aquaculture tailwater treatment device according to claim 1, characterized in that: The biological filtration dam comprises an outermost filter plate, a filter material supporting layer arranged in the filter plate, and a porous biological filter material layer arranged in the filter material supporting layer.

8. The aquaculture tailwater treatment device according to claim 7, characterized in that: The biological filtration dam also includes a single-pore membrane aeration pipe located in the porous biological filter material layer.

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