Fishery breeding tail water treatment system

Abstract

The utility model discloses a fishery breeding tail water treatment system, and mainly relates to the field of breeding tail water treatment. Comprising a first ecological ditch, a sedimentation tank, an aeration tank and an ecological purification tank which are sequentially communicated, the water inlet end of the first ecological ditch is communicated with aquaculture tail water, the water outlet end of the first ecological ditch is communicated with the sedimentation tank, a first filter dam for communicating the sedimentation tank with the aeration tank is arranged between the sedimentation tank and the aeration tank, and a second filter dam for communicating the aeration tank with the ecological purification tank is arranged between the aeration tank and the ecological purification tank; a filter feeding shellfish wall and an ecological floating island are put in the first ecological ditch. The device disclosed by the utility model has the beneficial effects that a water body is treated by utilizing a'filter feeding shellfish and three-pool two-dam process', the initial tail water can be pretreated, and the treatment effect is better.

Description

Technical Field

[0001] The utility model relates to the field of aquaculture tail water treatment, in particular to a fishery aquaculture tail water treatment system. Background Art

[0002] The tail water from aquaculture contains a large amount of suspended solids, complex pathogens, organic matter, and various impurities, so it needs to be properly treated before being discharged to reduce the impact on the environment.

[0003] "Three ponds and two dams" is a common aquaculture tailwater treatment system, which is mainly used to treat polluted water containing fish feces, residual feed and other organic matter generated during aquaculture. This system reduces the impact of aquaculture activities on the environment through a series of treatment processes, while improving the effective use of water resources.

[0004] Under the current common technology, the "three pools and two dams" technology has the problem of unstable water purification in practical application. The process of the three pools and two dams is first sedimentation, which removes and precipitates suspended matter in the sedimentation tank, and then performs filtration and biological treatment. However, due to the excessive abundance of various organic matter in the water body, the sedimentation tank has a high treatment pressure and cannot be effectively purified, resulting in poor results in subsequent physical treatment measures. Utility Model Content

[0005] The utility model aims to provide a fishery aquaculture tailwater treatment system, which utilizes "filter-feeding shellfish and three-ponds-two-dams process" to treat water bodies, can pre-treat initial tailwater, and has better treatment effect.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A fishery aquaculture tailwater treatment system comprises a first ecological ditch, a sedimentation tank, an aeration tank, and an ecological purification tank which are connected in sequence; the water inlet end of the first ecological ditch is connected to the aquaculture tailwater, the water outlet end of the first ecological ditch is connected to the sedimentation tank, a first filter dam is provided between the sedimentation tank and the aeration tank to connect the two, a second filter dam is provided between the aeration tank and the ecological purification tank to connect the two, and a filter-feeding shellfish wall and an ecological floating island are placed in the first ecological ditch.

[0008] Artificial aquatic plants, emergent plants and submerged plants are arranged in the sedimentation tank;

[0009] and / or

[0010] Emergent plants and submerged plants are planted in the ecological purification pool.

[0011] The outlet end of the first ecological ditch is connected to the center of the wall of the sedimentation tank away from the first filter dam. The artificial aquatic plant structure is arranged on the side of the sedimentation tank close to the outlet end. The artificial aquatic plant structure includes a plurality of fixed ropes arranged in parallel. The length of the fixed rope is adapted to the length of the adjacent pool wall. Both ends of the fixed rope are fixed with ground-inserted wooden stakes, and the ground-inserted wooden stakes are inserted into the bottom of the sedimentation tank. Artificial aquatic plants are fixed on the fixed ropes.

[0012] In the sedimentation tank and / or ecological purification tank, the emergent plants are distributed around the tank body, and the submerged plants are spread all over the bottom of the tank body.

[0013] The first filter dam and the second filter dam both include a dam body frame, and the dam body frame is filled with multiple filter material layers, the filter material layers include a large particle filter material layer, a medium particle filter material layer, and a small particle filter material layer. The large particle filter material layer is located in the top layer and the average filter material particle size is 13±1cm, the medium particle filter material layer is located in the middle layer and the average filter material particle size is 8±1cm, and the small particle filter material layer is located in the lower layer and the average filter material particle size is 3±1cm.

[0014] A breeding pond is also dug at the bottom of the first ecological ditch, in which filter-feeding shellfish are placed, and the breeding pond is staggered with the filter-feeding shellfish wall.

[0015] The filter-feeding shellfish wall includes a buoyancy frame, which is a rectangular frame structure obtained by processing PVC pipes. At least four vertical pipes extending vertically downward are provided on the bottom side of the buoyancy frame. The setting positions of the vertical pipes include at least the four corner ends of the buoyancy frame. Floats are movably sleeved on the vertical pipes. A plug for blocking the float is detachably connected to the bottom of the vertical pipe. A breeding net is fixed under the buoyancy frame, and the breeding net is arranged in several layers along the depth direction.

[0016] Pull ropes are fixed on both sides of the buoyancy frame respectively, and the outer ends of the pull ropes are provided with ground-inserted wooden stakes nailed into the side walls of the first ecological ditch.

[0017] Pull rings are fixed on the upper part of the side walls on both sides of the first ecological ditch, and a pull rope passes through the two pull rings. A vertically extending strip hole passes through the lower part of the riser located at the corner end of the buoyancy frame. A counterweight block and a pull rope are arranged in the riser. The two ends of the pull rope pass through the strip hole respectively and are then wrapped around and fixed on the counterweight block.

[0018] The ecological purification pool is provided with a second ecological ditch connected to the aeration pool on one side away from the aeration pool, and the second ecological ditch is used to discharge the water treated by the system. The ecological purification pool is connected to the second ecological ditch through a bellows or a gate.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This technology adopts the "enhanced ecological ditch + three pools and two dams fishery tailwater treatment system and process". On the basis of the original treatment process "three pools and two dams", a filter-feeding shellfish net wall structure is added to the ecological ditch to preliminarily purify the initial tailwater. Filter-feeding shellfish feed on bacteria, algae, and organic debris in the water body, which can increase the transparency of the tailwater and reduce the organic matter content. Compared with physical and chemical methods, it can pre-treat the initial tailwater and has a better treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view schematic diagram of the system of the utility model.

[0022] Figure 2 It is a schematic diagram of the artificial water grass structure of the utility model.

[0023] Figure 3 It is a top view schematic diagram of the aeration mechanism of the utility model.

[0024] Figure 4 It is a schematic diagram of the installation of embodiment 1 of the utility model.

[0025] Figure 5 It is a schematic diagram of the buoyancy frame of Example 1 of the utility model.

[0026] Figure 6 It is a schematic diagram of the filter-feeding shellfish wall of Example 2 of the present utility model.

[0027] Figure 7 It is a top view of a portion of the first ecological ditch in Example 2 of the utility model.

[0028] Figure 8 It is a schematic diagram of the buoyancy frame of Example 3 of the utility model.

[0029] Fig. 9 It is a schematic diagram of the component disassembly of the buoyancy frame of Example 3 of the utility model.

[0030] Numbers shown in the accompanying drawings:

[0031] 1. The first ecological ditch; 2. The sedimentation tank; 3. The aeration tank; 4. The ecological purification tank; 5. The second ecological ditch; 6. The water inlet; 7. The water outlet; 8. The first filter dam; 9. The second filter dam; 10. The artificial aquatic plant structure; 11. The fixing rope; 12. The wooden stakes inserted into the ground; 13. The emergent plants; 14. The submerged plants; 15. The filter-feeding shellfish wall; 16. The ecological floating island; 17. The breeding pond; 18. The straight pipe; 19. The three-way connector; 20. The connector; 21. The float; 22. The vertical pipe; 23. The plug; 24. The breeding net; 25. The supporting grid; 26. The hanging rope; 27. The pull rope; 28. The pull ring; 29. ​​The counterweight; 30. The strip hole; 31. The main air pipe; 32. The air distribution pipe; 33. The disc aerator. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0033] The system includes a first ecological ditch 1, a sedimentation tank 2, an aeration tank 3, and an ecological purification tank 4 which are connected in sequence; the water inlet end 6 of the first ecological ditch 1 is connected to the aquaculture tail water, the water outlet end 7 of the first ecological ditch 1 is connected to the sedimentation tank 2, a first filter dam 8 is provided between the sedimentation tank 2 and the aeration tank 3 to connect the two, a second filter dam 9 is provided between the aeration tank 3 and the ecological purification tank 4 to connect the two, and a filter-feeding shellfish wall 15 and an ecological floating island 16 are placed in the first ecological ditch 1.

[0034] By setting up the first ecological ditch 1 in front of the sedimentation tank 2, and installing multiple treatment systems in the first ecological ditch 1, namely, the filter-feeding shellfish wall 15 and the ecological floating island 16, the initial tail water can be initially purified. The filter-feeding shellfish feed on bacteria, algae, and organic debris in the water body, which can increase the transparency of the tail water and reduce the organic matter content. This lays a good foundation for subsequent treatment and realizes the reuse of substances in the water.

[0035] An artificial aquatic plant structure 10 , emergent plants 13 , and submerged plants 14 are arranged in the sedimentation tank 2 .

[0036] Emergent plants 13 and submerged plants 14 are planted in the ecological purification pool 4 .

[0037] Specifically, the outlet end 7 of the first ecological ditch 1 is connected to the center of the wall of the sedimentation tank 2 away from the first filter dam 8. The artificial aquatic plant structure 10 is arranged on the side of the sedimentation tank 2 close to the outlet end 7. The artificial aquatic plant structure 10 includes a plurality of fixed ropes 11 arranged in parallel. The length of the fixed rope 11 is adapted to the length of the adjacent pool wall. Both ends of the fixed rope 11 are fixed with ground-inserted wooden stakes 12. The ground-inserted wooden stakes 12 are inserted into the bottom of the sedimentation tank 2, and artificial aquatic plants are fixed on the fixed ropes 11.

[0038] Based on the arrangement of the artificial aquatic plant structure 10, the water entering the sedimentation tank 2 is first filtered and processed by the artificial aquatic plants. The structure is easy to install and maintain, and the spacing between each row of artificial aquatic plants can be adjusted as needed.

[0039] The fixing rope 11 can be a nylon rope, which is strong and durable.

[0040] In the sedimentation tank 2 and the ecological purification tank 4, the emergent plants 13 can be distributed around the sedimentation tank 2, and the submerged plants 14 can cover the bottom of the sedimentation tank 2 or the ecological purification tank 4 as needed.

[0041] During the specific arrangement, the widths of the sedimentation tank 2, the aeration tank 3 and the ecological purification tank 4 are consistent, and the three tank bodies are arranged adjacent to each other in sequence along the length direction, which is convenient for construction.

[0042] The first filter dam 8 and the second filter dam 9 are respectively arranged on opposite side walls of the aeration tank 3, and the first filter dam 8 and the second filter dam 9 are respectively arranged at ends away from each other.

[0043] Based on the fact that the aeration tank 3 is arranged between the sedimentation tank 2 and the ecological purification tank 4, and the aeration tank 3 is relatively narrow, the first filter dam 8 and the second filter dam 9 are staggered. The first filter dam 8 is arranged at one end of the adjacent pool wall of the aeration tank 3 and the sedimentation tank 2, and the second filter dam 9 is arranged at the other end of the adjacent ecological purification tank 4 of the aeration tank 3, so that the water body can be fully mixed with the gas when passing through the aeration tank 3.

[0044] An aeration mechanism is installed at the bottom of the aeration tank 3, and the aeration mechanism includes: a main air pipe 31, an air distribution pipe 32, and a disc aerator 33. A single control valve is installed on the main air pipe 31, and the main air pipe 31 is connected to the air distribution pipe 32. The air distribution pipe 32 is an air distribution structure in a "F" shape, which has a good distributed aeration effect.

[0045] The first filter dam 8 and the second filter dam 9 both include a dam body frame, and multiple filter material layers are filled in the dam body frame. The particle sizes of the filter material layers decrease from top to bottom.

[0046] The filter material layer comprises a large particle filter material layer, a medium particle filter material layer and a small particle filter material layer. The average particle size of the large particle filter material layer is 13±1 cm, the average particle size of the medium particle filter material layer is 8±1 cm, and the average particle size of the small particle filter material layer is 3±1 cm.

[0047] A breeding pond 17 is also dug at the bottom of the first ecological ditch 1 , in which filter-feeding shellfish are placed. The breeding pond 17 and the filter-feeding shellfish wall 15 are staggered.

[0048] In the ecological ditch, the water may contain a large amount of suspended matter, such as residual feed, fish excrement, etc. In the process of passing through the ecological ditch, a large amount of suspended matter will gradually gather at the bottom if the flow rate is stable or slow. Therefore, in order to increase the treatment efficiency, the method of shellfish bottom farming is adopted at the same time. When it is implemented, the breeding pond is dug about 30 centimeters below 17, and the shellfish are placed in this pond for breeding. Take into account the treatment of water bodies at different height levels and enhance the digestion capacity of suspended matter in the bottom water body.

[0049] The ecological ditch can be arranged at any length as required, and the length can be more than ten meters or tens of meters, or even one or two hundred meters. Based on the length of the ecological ditch and according to the on-site conditions, the filter-feeding shellfish wall 15, the breeding pond 17, and the ecological floating island 16 are arranged at a distance.

[0050] The filter-feeding shellfish wall 15 includes a buoyancy frame and a culture net 24;

[0051] The buoyancy frame is a rectangular frame structure made of PVC pipes, and the size is customized according to the width of the ditch. In order to facilitate modular installation and use, the buoyancy frame is flexibly assembled by processing into assembleable parts, including a straight pipe 18, a three-way connection seat 19, a connector 20, and a float 21;

[0052] (1) Straight pipe 18

[0053] The straight tube 18 can be customized to be 50cm, 80cm, and 100cm, and the 50cm specification is recommended. It has an appropriate length, good load-bearing capacity, higher flexibility in assembly, and can be directly used with the common 50-50 specification mesh box.

[0054] (2) Three-way connector 19

[0055] There are four three-way connecting seats 19 for each group of filter-feeding shellfish walls 15 and they are respectively located at the four corner ends of the entire buoyancy frame. The three-way connector 20 is a three-way pipe made of PVC pipe, including two first sleeves extending horizontally and arranged at right angles. The right-angled ends of the two first sleeves are provided with a vertical pipe 22 extending downward. The inner diameter of the first sleeve is adapted to the outer diameter of the straight pipe 18. After one end of the straight pipe 18 is sleeved in the first sleeve, the specific fixing method of the two can be threaded connection, plugged with electrical tape, or fixed with glue after insertion. The vertical pipe 22 is used to install other functional components.

[0056] (3) Float 21

[0057] The float 21 is an elliptical or round sphere, which is not easy to scratch the net. The float 21 is provided with through holes running through the top and bottom. The float 21 is sleeved on the standpipe 22 through the through holes to achieve quick installation.

[0058] (4) Plug 23

[0059] The bottom of the riser 22 is sleeved with a detachable plug 23 , the diameter of the plug 23 being larger than the through hole of the float 21 , so as to prevent the float 21 from being separated from the riser 22 and achieve quick installation.

[0060] The first pipe sleeve is used to combine the straight pipe 18 into two end parts of the frame structure, and the float 21 can be quickly installed based on the vertical pipe 22 to provide buoyancy for the entire buoyancy frame.

[0061] (5) Connector 20

[0062] The connector 20 is used to connect the straight pipes 18 in the middle connecting part of the buoyancy frame, so as to connect the four straight pipes 18 into adjacent square frame units. If the ditch is narrow, a group of four straight pipes 18 are used to form a square buoyancy frame, then only four three-way connectors 19 and four straight pipes 18 are needed. If the ditch is wide, multiple groups of square frames can be formed into a row, spanning the middle of the ditch, and the connections between adjacent straight pipes 18 at non-corner positions can be spliced ​​and fixed by the connector 20.

[0063] The connecting member 20 includes three second sleeves extending horizontally and adjacent to each other vertically. The three second sleeves are integrally formed to form a planar three-way structure. The second sleeves are detachably fixed to one end of the straight pipe 18 respectively, and the fixing method is consistent with the first sleeve, which is convenient for unified processing and installation.

[0064] As required, a riser 22 may also be fixed below the connector 20, thereby increasing the number of floats 21 and improving buoyancy.

[0065] The buoyancy frame realizes a Lego-style assembly form through modularization of components. Any group of square frame units can be flexibly assembled as needed to adapt them to the width of the ditch. It is easy to install and use flexibly, and has good adaptability to the site.

[0066] (6) Breeding net 24

[0067] The aquaculture net 24 is a common aquaculture net 24 available on the market. A round or square net can be used. A single layer or multiple layers of aquaculture nets 24 can be selected according to the depth. For example, if the 50-50 cage is 2 meters deep, it should be divided into 2-3 layers. If it is 1 meter deep, it is not divided into layers. The top side of the aquaculture net 24 is fixed on the buoyancy frame. If it is a square cage, a cage corresponding to the width of the straight tube 18 can be selected, and the top sides of the aquaculture net 24 are respectively fixed on the straight tube 18 on the same side to facilitate the aquaculture net 24 to be better deployed in the water body.

[0068] Embodiment 1:

[0069] like Figure 1 As shown, the system includes a first ecological ditch 1, a sedimentation tank 2, an aeration tank 3, an ecological purification tank 4, and a second ecological ditch 5 which are connected in sequence.

[0070] The water inlet end 6 of the first ecological ditch 1 is connected to the aquaculture tail water, the water outlet end 7 of the first ecological ditch 1 is connected to the center of one side of the sedimentation tank 2, a first filter dam 8 is provided between the sedimentation tank 2 and the aeration tank 3 to connect the two, a second filter dam 9 is provided between the aeration tank 3 and the ecological purification tank 4 to connect the two, the side of the ecological purification tank 4 away from the aeration tank 3 is connected to the second ecological ditch 5 through a gate, and the second ecological ditch 5 is used to discharge the water treated by the system.

[0071] Based on this treatment system, the aquaculture tail water enters the first ecological ditch 1 through the water inlet end 6, enters the sedimentation tank 2 from the water outlet end 7, and after sedimentation in the sedimentation tank 2, enters the aeration tank 3 through the first filter dam 8. The water in the aeration tank 3 passes through the second filter dam 9 and enters the ecological purification tank 4, and is discharged after purification.

[0072] The sedimentation tank 2 is provided with artificial aquatic grass structures 10, emergent plants 13, and submerged plants 14. The artificial aquatic grass is arranged in three layers adjacent to the outlet end 7 of the first ecological ditch 1, and each layer is fixed to the bottom of the sedimentation tank 2 by wooden stakes 12 inserted into the ground.

[0073] Emergent plants 13 and submerged plants 14 are planted in the ecological purification pool 4 .

[0074] The first ecological ditch 1 is connected to a filter-feeding shellfish wall 15 and an ecological floating island 16. The filter-feeding shellfish wall 15 is arranged at both ends of the first ecological ditch 1, and the ecological island is arranged between the filter-feeding shellfish walls 15 and has three groups.

[0075] like Figure 4-5 As shown, the buoyancy frame includes a row of three groups of square frames along the width direction of the first ecological ditch 1, and is specifically composed of 10 straight pipes 18, 4 connectors 20 and 4 three-way connectors 19.

[0076] The straight pipe 18 is a PVC straight pipe 18 with a length of 50 cm. It is combined into three continuous square frames, wherein four connectors 20 are distributed in a square shape in the middle to fix adjacent straight pipes 18 respectively, and the three-way connector 19 is located at the four corners, so as to connect the straight pipes 18 at the four corners. After the straight pipe 18 is inserted into the first sleeve and the second sleeve, it is fixed by gluing, which is firm and reliable.

[0077] The breeding net 24 is composed of 6 standard aquaculture net boxes of 50*50cm, which are arranged in two layers of upper and lower layers in a row of 3. Since the size of the net boxes is basically corresponding to the size of the square frame formed by 4 straight tubes 18, the openings of the net boxes in the upper row are directly fixed to the adjacent straight tubes 18 by fishing lines, and the 3 net boxes in the lower row are sewn and fixed to the 3 net boxes in the upper row correspondingly, so as to obtain a net wall with a 3*2 net box structure.

[0078] A supporting grid 25 adapted to the size of a single net box is provided at the bottom thereof. The supporting grid 25 is a metal bracket used to prop up the net box and keep it in a square unfolded state.

[0079] A vertical pipe 22 is fixed below the three-way connection seat 19 and the connector 20. A plug 23 mounted on the straight pipe 18 is sleeved at the bottom of the vertical pipe 22. The plug 23 is inserted into the vertical pipe 22 and fixed by gluing. When installing, the float 21 is inserted into the vertical pipe 22 from bottom to top, and then the plug 23 is inserted and fixed.

[0080] The buoyancy frame has floats 21 at the connection positions of the straight pipes 18, which has good buoyancy effect and stable support.

[0081] A pull rope 27 is tied to the straight tube 18 located at both ends of the buoyancy frame, and the outer end of the pull rope 27 is also provided with a ground-inserted wooden stake 12. The ground-inserted wooden stake 12 is inserted into the upper part of the side wall of the slope protection on both sides of the first ecological ditch 1, so that the entire buoyancy frame is pulled and positioned in the middle position of the first ecological ditch 1, and the length direction of the buoyancy frame corresponds to the width of the first ecological ditch 1.

[0082] Embodiment 2:

[0083] The system includes a first ecological ditch 1, a sedimentation tank 2, an aeration tank 3, an ecological purification tank 4, and a second ecological ditch 5 which are connected in sequence. The arrangement of each tank is the same as that of the first embodiment.

[0084] The difference lies in the structure of the first ecological ditch 1. Specifically:

[0085] (1) In the first ecological ditch 1, filter-feeding shellfish walls 15 and ecological floating islands 16 are arranged alternately, and a 30 cm breeding pond 17 is dug between the filter-feeding shellfish walls 15 and the ecological floating islands 16, and shellfish are cultured in this breeding pond 17 at the same time.

[0086] (2) The structure of the filter-feeding shellfish wall 15 is different, and the difference is:

[0087] like Figure 6-7 As shown, in this example, the buoyancy frame is composed of two square frames composed of seven straight pipes 18, which are arranged in parallel along the width direction of the first ecological ditch 1. It also includes two connectors 20 and four three-way connectors 19.

[0088] The straight pipe 18 is a PVC straight pipe 18 with a length of 80 cm, the two connectors 20 are centered, and the four three-way fixing seats are still located at the corner ends, which are spliced ​​together to form two continuous square frames.

[0089] The straight pipe 18 is threadedly connected to the first sleeve and the second sleeve respectively, which is convenient for assembly.

[0090] There is no riser 22 at the bottom of the connector 20 , and the float 21 is only installed through the three-way connector 19 .

[0091] The breeding net 24 is a cylindrical breeding net 24, including two layers, and a circular supporting grid 25 is fixed at the bottom of each layer. A hanging rope 26 is provided on the top of the breeding net 24, which is fixed to the center of each straight tube 18 through the hanging rope 26 (nylon rope), thereby obtaining a triple net wall structure staggered along the flow direction of the water body, causing certain disturbances to the flow of the water body, making it easier for the water body to fully contact with the shellfish, and improving the treatment effect.

[0092] The two ends of the buoyancy frame are also used to achieve the centering of the filter-feeding shellfish wall 15 through the pull rope 27 and the ground-inserted wooden piles 12. The pull rope 27 is fastened to the riser 22 of the three-way connecting seat 19, and the positioning effect is better through the pulling of the four corner ends.

[0093] Embodiment 3:

[0094] The system includes a first ecological ditch 1, a sedimentation tank 2, an aeration tank 3, and an ecological purification tank 4 which are connected in sequence; the structures of the sedimentation tank 2, the aeration tank 3, and the ecological purification tank 4 are the same as those in Example 1.

[0095] The difference lies in the structure of the first ecological ditch 1. The structure of the filter-feeding shellfish wall 15 is different, and the difference is:

[0096] like Figure 8-9 As shown, in this example, the buoyancy frame is composed of two square frames composed of seven straight pipes 18, which are arranged in parallel along the width direction of the first ecological ditch 1. It also includes two connectors 20 and four three-way connectors 19.

[0097] The straight pipe 18 is a PVC straight pipe 18 with a length of 50 cm, the two connectors 20 are centered, and the four three-way fixing seats are still located at the corner ends, which are spliced ​​together to form two continuous square frames.

[0098] The straight pipe 18 is threadedly connected to the first sleeve and the second sleeve respectively, which is convenient for assembly.

[0099] The bottom of the plug 23 is a closed structure and the peripheral side has a concave-convex pattern, which is easy to rotate. The upper part of the plug 23 is threadedly connected to the bottom end of the standpipe 22, and the assembly is very convenient.

[0100] A riser 22 is fixed below the three-way connection seat 19 and the connection piece 20, wherein two floats 21 are sleeved on the riser 22 of the connection piece 20 and blocked with a plug 23 at the bottom, and one riser 22 is sleeved on the riser 22 below the three-way connection seat 19 at both ends. Therefore, the buoyancy and bearing capacity are significantly higher.

[0101] Pull rings 28 are fixed on the upper part of the side walls of both sides of the first ecological ditch 1. The pull rings 28 are metal rings that are nailed into the slope protection for fixation. A pull rope 27 passes through the pull rings 28. One pull rope 27 + two pull rings 28 form a group. One group can be set, or two groups can be set at equal distances corresponding to the length of the straight pipe 18.

[0102] The two ends of the pull rope 27 are fixed with counterweights 29, which can be fixed by winding, and the length can be conveniently adjusted. The counterweight 29 is matched with the tube cavity gap of the vertical pipe 22, and the lower part of the vertical pipe 22 is penetrated by a vertically extending strip hole 30, and the strip hole 30 is provided with an opening at the bottom end. When the counterweight 29 is inserted into the vertical pipe 22 from the bottom end, the pull rope 27 is pulled into the strip hole 30 from the opening and penetrates from the strip hole 30, so as to pull the buoyancy frame at both ends.

[0103] The installation sequence of this part is to pass the pull rope 27 through the two corresponding pull rings 28 as needed, then fix the pull rope 27 between the two counterweights 29 and adjust the appropriate length. After the buoyancy frame body is installed, the installation sequence of the riser 22 located below the three-way connecting seat 19 is: first insert the floats 211 - insert the counterweights 29 - pass the pull rope 27 through the strip hole 30 - tighten the plug 23.

[0104] After installation, the position of the buoyancy frame in the first ecological ditch 1 can be adjusted by pulling the pull rope 27. Since the first ecological ditch 1 is often very long, if it is fixed in the traditional way, it is necessary to loosen the ground piles on both sides of the ditch at the same time to pull the net cage to the shore for maintenance. Under this structure, the two ends of the buoyancy frame are pulled by the two ends of the pull rope 27, and the middle part of the pull rope 27 passes through the pull rings 28 on both sides, so the entire net wall can be pulled to the shore by pulling the pull rope 27 on one side. There is no need for two people to cooperate, or to shuttle back and forth between the two sides, and the fixation requires that the pull rope 27 and the pull ring 28 be tied at the appropriate position through a fishing line or nylon rope. In addition, when the water level floats, the pull rope 27 has up and down activity space in the strip hole 30, which can adapt to the appropriate floating changes of the water level.

Claims

1. A fishery tailwater treatment system, characterized in that: It includes a first ecological ditch, a sedimentation tank, an aeration tank, and an ecological purification tank which are connected in sequence; the water inlet end of the first ecological ditch is connected to the aquaculture tail water, the water outlet end of the first ecological ditch is connected to the sedimentation tank, a first filter dam is provided between the sedimentation tank and the aeration tank to connect the two, a second filter dam is provided between the aeration tank and the ecological purification tank to connect the two, and a filter-feeding shellfish wall and an ecological floating island are placed in the first ecological ditch.

2. A fishery aquaculture tailwater treatment system according to claim 1, characterized in that: Artificial aquatic plants, emergent plants and submerged plants are arranged in the sedimentation tank; and / or Emergent plants and submerged plants are planted in the ecological purification pool.

3. A fishery aquaculture tailwater treatment system according to claim 2, characterized in that: The outlet end of the first ecological ditch is connected to the center of the wall of the sedimentation tank away from the first filter dam. The artificial aquatic plant structure is arranged on the side of the sedimentation tank close to the outlet end. The artificial aquatic plant structure includes a plurality of fixed ropes arranged in parallel. The length of the fixed rope is adapted to the length of the adjacent pool wall. Both ends of the fixed rope are fixed with ground-inserted wooden stakes, and the ground-inserted wooden stakes are inserted into the bottom of the sedimentation tank. Artificial aquatic plants are fixed on the fixed ropes.

4. A fishery aquaculture tailwater treatment system according to claim 2, characterized in that: In the sedimentation tank and / or ecological purification tank, the emergent plants are distributed around the tank body, and the submerged plants are spread all over the bottom of the tank body.

5. A fishery aquaculture tailwater treatment system according to claim 1, characterized in that: The first filter dam and the second filter dam both include a dam body frame, and the dam body frame is filled with multiple filter material layers, the filter material layers include a large particle filter material layer, a medium particle filter material layer, and a small particle filter material layer. The large particle filter material layer is located in the top layer and the average filter material particle size is 13±1cm, the medium particle filter material layer is located in the middle layer and the average filter material particle size is 8±1cm, and the small particle filter material layer is located in the lower layer and the average filter material particle size is 3±1cm.

6. A fishery aquaculture tailwater treatment system according to claim 1, characterized in that: A breeding pond is also dug at the bottom of the first ecological ditch, in which filter-feeding shellfish are placed, and the breeding pond is staggered with the filter-feeding shellfish wall.

7. A fishery aquaculture tailwater treatment system according to claim 1, characterized in that: The filter-feeding shellfish wall includes a buoyancy frame, which is a rectangular frame structure obtained by processing PVC pipes. At least four vertical pipes extending vertically downward are provided on the bottom side of the buoyancy frame. The setting positions of the vertical pipes include at least the four corner ends of the buoyancy frame. Floats are movably sleeved on the vertical pipes. A plug for blocking the float is detachably connected to the bottom of the vertical pipe. A breeding net is fixed under the buoyancy frame, and the breeding net is arranged in several layers along the depth direction.

8. A fishery aquaculture tailwater treatment system according to claim 7, characterized in that: Pull ropes are fixed on both sides of the buoyancy frame respectively, and the outer ends of the pull ropes are provided with ground-inserted wooden stakes nailed into the side walls of the first ecological ditch.

9. A fishery aquaculture tailwater treatment system according to claim 7, characterized in that: Pull rings are fixed on the upper part of the side walls on both sides of the first ecological ditch, and a pull rope passes through the two pull rings. A vertically extending strip hole passes through the lower part of the riser located at the corner end of the buoyancy frame. A counterweight block and a pull rope are arranged in the riser. The two ends of the pull rope pass through the strip hole respectively and are then wrapped around and fixed on the counterweight block.

10. A fishery aquaculture tailwater treatment system according to claim 7, characterized in that: A second ecological ditch connected to the aeration tank is provided on one side of the ecological purification tank away from the aeration tank. The second ecological ditch is used to discharge water treated by the system. The ecological purification tank is connected to the second ecological ditch through a bellows or a gate.

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