Device and method for treating sewage by short-cut denitrification in circulating water culture system

Abstract

The invention provides a device and a method for treating sewage by short-cut denitrification in a circulating water culture system, and belongs to the technical field of sturgeon culture. The device comprises an anaerobic tank, a disinfection tank, a clean water tank, a standby tank, a clean water inlet pipeline, a fry feeding assembly and a PLC control system, the outlet end of the anaerobic tank is communicated with the disinfection tank; the outlet end of the disinfection tank is communicated with the clean water tank; the standby pool is communicated with the clean water pool; clear water in the clean water tank flows into the fry feeding assembly, dissolved oxygen in the fry feeding assembly is supplemented, metabolic waste is diluted, wastewater in the fry feeding assembly is discharged into the anaerobic tank to be subjected to denitrification treatment, treated sewage enters the disinfection tank and is firstly neutralized and then disinfected, and the disinfected clean water flows into the clean water tank to be aerated. The oxygen content of the clear water is increased, and water recycling is completed. Wastewater generated in the artificial breeding process of sturgeons is recycled, water resources are saved, and the whole process is not affected by the outside world.

Description

Technical Field

[0001] The invention belongs to the technical field of sturgeon breeding, and in particular relates to a device and method for short-range denitrification treatment of sewage in a circulating water breeding system. Background Art

[0002] Sturgeon is a very rare cold-water fish, known for its unique biological characteristics and important economic value. Artificial breeding of sturgeon is an important means to protect and utilize this rare species. As natural sturgeon resources are on the verge of depletion, artificial breeding has become a key method to save sturgeons. Its main breeding methods include collecting wild seedlings or using artificial breeding technology for proliferation. During the breeding process, it is necessary to control environmental factors such as water temperature, dissolved oxygen, and water quality, and provide an appropriate amount of feed. Through careful management, sturgeons can complete their entire life cycle in an artificial environment. Artificial breeding can not only meet the market demand for high-end aquatic products such as sturgeon roe (fish roe), but also reduce the fishing pressure on wild populations, providing strong support for the protection and recovery of endangered populations.

[0003] At present, sturgeon farming is mainly based on flow-through farming and cage farming. Flow-through farming uses high-quality spring water or river water as the water source. Through mechanical water extraction or the use of natural terrain drop, the water in the fish pond is kept at an appropriate flow rate and flow rate. The aquaculture water is not reused. The advantages of this farming model are low cost and easy management; the disadvantages are that it is easily affected by the external environment, poor controllability, and drainage outside the aquaculture is easy to pollute the environment. Cage farming is a farming method that uses ecological waters such as reservoirs and large rivers, combined with intensive farming of small water bodies in cages. The advantages are easy harvesting and high yield, and the disadvantages are that it is greatly affected by the external environment and is easy to pollute the water environment. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a device and method for short-range denitrification treatment of sewage in a recirculating aquaculture system, which can timely treat the wastewater in aquaculture within a smaller range, effectively solving the problems in the prior art that sturgeon artificial breeding is easily affected by the external environment, has poor controllability, and the drainage outside the breeding is easy to pollute the environment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a device for short-range denitrification treatment of sewage in a circulating aquaculture system, comprising an anaerobic tank, a disinfection tank, sturgeons to be raised, a clean water tank, a spare tank, a clean water inlet pipe, a fry rearing component and a PLC control system; the outlet end of the anaerobic tank is connected to the disinfection tank; the outlet end of the disinfection tank is connected to the clean water tank; the spare tank is connected to the clean water tank; the clean water in the clean water tank flows into the fry rearing component through the clean water inlet pipe to replenish the dissolved oxygen in the fry rearing component and dilute metabolic wastes, the wastewater in the fry rearing component is discharged into the anaerobic tank for denitrification treatment, the treated sewage enters the disinfection tank, is first neutralized and then disinfected, the disinfected clean water flows into the clean water tank for aeration, increases the oxygen content of the clean water, and completes the recycling of water.

[0006] Preferably, the anaerobic tank comprises an anaerobic tank body, an anaerobic tank water inlet pipe, a supporting layer, a biological filler layer and an anaerobic tank drainage pipe, the anaerobic tank water inlet pipe and the anaerobic tank drainage pipe are both connected to the anaerobic tank body, the supporting layer and the biological filler layer are both located inside the anaerobic tank body, the biological filler layer is located on the top of the supporting layer, a first water pump is provided on the anaerobic tank drainage pipe, and a first stop valve is provided on the outlet pipe of the disinfection tank.

[0007] Preferably, the clear water tank includes a clear water tank body, a first liquid level sensor, a water supply pipe, a bypass pipe and a clear water tank drainage pipe, the first liquid level sensor is located on the front of the clear water tank body, the water supply pipe and the clear water tank drainage pipe are both communicated with the clear water tank body, the bypass pipe is located at the bottom of the clear water tank body and is communicated with it, the water supply pipe is provided with a first solenoid valve, the bypass pipe is provided with a second solenoid valve, the clear water tank drainage pipe is provided with a second stop valve, the standby tank includes a standby tank body, a second liquid level sensor and a standby tank drainage pipe, the second liquid level sensor is located on the front of the standby tank body, and the standby tank drainage pipe is provided with a second water pump and a standby tank one-way valve.

[0008] Preferably, the clean water inlet pipe includes a U-shaped main water inlet pipe, a first branch water inlet pipe, a second branch water inlet pipe, a third branch water inlet pipe and a fourth branch water inlet pipe. The first branch water inlet pipe, the second branch water inlet pipe, the third branch water inlet pipe and the fourth branch water inlet pipe are all connected to the U-shaped main water inlet pipe, there is a third stop valve on the first branch water inlet pipe, a fourth stop valve on the second branch water inlet pipe, a fifth stop valve on the third branch water inlet pipe, and a sixth stop valve on the fourth branch water inlet pipe.

[0009] Preferably, the fry rearing assembly includes a breeding box assembly, a blocking pipe assembly, a lifting assembly and a breeding box drainage pipe, the movable box on the top of the lifting assembly is located inside the breeding box assembly, the fixed box on the top of the breeding box drainage pipe is located inside the breeding box assembly, the blocking pipe assembly is located inside the breeding box assembly, and the movable box is located on the top of the fixed box.

[0010] Preferably, the breeding box assembly includes a breeding box shell, a partition plate and a card plate assembly, the partition plate is located inside the breeding box shell, a first through hole and a second through hole are opened on the bottom plate of the breeding box shell, a partition opening is provided on the partition plate, three sides of the partition opening are provided with a first groove, the card plate assembly is engaged in the partition opening, the card plate assembly includes a pull-out plate and a handle, the handle is located on the top of the pull-out plate and fixedly connected thereto; the partition plate, the mobile box and the breeding box shell divide the fry breeding assembly into four areas A, B, C and D.

[0011] Preferably, a third through hole is provided at the center of the blocking tube assembly, the blocking tube assembly comprises a blocking tube and a connecting end plate, a fourth through hole and a second groove are provided on the connecting end plate, and the end of the blocking tube away from the connecting end plate is a tapered end.

[0012] Preferably, the flow rate V1 of water passing through a single branch inlet pipe of the clean water inlet pipe, the discharge flow rate V2 of water passing only through the fourth through holes of the two blocking pipe assemblies, and the discharge flow rate V3 of water passing through both the fourth through hole and the third through hole of the two blocking pipe assemblies simultaneously have the following relationship: V2<V1<V3.

[0013] Preferably, the lifting assembly also includes an electric cylinder assembly, the moving box is located on the top of the electric cylinder assembly and is fixedly connected thereto, a fifth through hole is provided around the box body of the moving box, a sixth through hole is provided on the bottom plate of the moving box, the breeding box drainage pipe also includes a U-shaped main water outlet pipe, a seventh through hole and an eighth through hole are provided on the bottom plate of the fixed box, and a conical mouth corresponding to the conical end is provided on the pipe of the U-shaped main water outlet pipe.

[0014] The present invention also provides a method for using the above device, which includes a sturgeon transfer method S1, a water circulation method S2, and a method for maintaining the water level in a clear water tank S3;

[0015] The sturgeon transfer method S1 comprises the following steps:

[0016] S11, putting clean water into the four areas A, B, C, and D of the fry rearing component, at which time the clean water cannot flow out through the fourth through hole, and putting sturgeons to be reared into the D area, the C area, and the B area of ​​the fry rearing component in sequence at preset time intervals;

[0017] S12, placing feed in the area where sturgeons are present, wherein undigested food residues and sturgeon feces will sink to the bottom of the mobile box in the corresponding area;

[0018] S13, after a preset time, the third stop valve on the A area of ​​the fry rearing assembly is opened and the sixth stop valve on the D area is closed, and the electric cylinder assembly under the D area of ​​the fry rearing assembly is lifted until the mobile box of the area abuts against the connecting end plate, the water level in the D area will drop and be discharged through the third through hole, a part of which directly enters the anaerobic tank through the drainage pipe of the breeding box, and a part of which falls into the area between the mobile box and the fixed box through the fourth through hole. When the water level in the D area drops to a preset value, the card plate assembly between the D area and the A area is raised, and the sturgeons and a small amount of water enter the A area;

[0019] S14, resetting the card assembly between the D area and the A area, and pumping the food residues and sturgeon feces in the mobile box into a designated location for composting by means of a mud pump;

[0020] S15, continue to lift the electric cylinder assembly under the D area, so that the plugging pipe assembly is completely separated from the drainage pipe of the breeding box, and the water between the mobile box and the fixed box enters the anaerobic tank through the drainage pipe of the breeding box;

[0021] S16, resetting the electric cylinder assembly in the D area, and injecting clean water into the D area, so that the clean water cannot flow out through the fourth through hole;

[0022] S17, sequentially at preset time intervals, moving the sturgeons in area C to area D and cleaning area C, moving the sturgeons in area B to area C and cleaning area B, and moving the sturgeons in area A to area B and cleaning area A;

[0023] The water recycling method S2 comprises the following steps:

[0024] S21, the wastewater in the anaerobic tank is denitrified, further purified through the biological filler layer and then pumped into the disinfection tank;

[0025] S22, the water in the disinfection tank is first neutralized and then disinfected, and the clean water after disinfection flows into the clean water tank;

[0026] S23, aerating the water in the clean water tank to increase the oxygen content of the clean water and provide a water source for the fry rearing assembly;

[0027] The water level in the clean water tank is automatically controlled by the liquid level sensor and PLC control system;

[0028] The method S3 for maintaining the water level in the clear water tank comprises the following steps:

[0029] S31, when the water level in the clean water tank is higher than the high value set by the first liquid level sensor, the first liquid level sensor feeds back a signal to the PLC control system, opens the second solenoid valve, and the clean water in the clean water tank flows into the standby tank. When the water level in the clean water tank drops and is lower than the high value set by the first liquid level sensor, closes the second solenoid valve;

[0030] S32, when the water level in the clear water tank is lower than the low value set by the first liquid level sensor, the first liquid level sensor feeds back a signal to the PLC control system, and at this time the liquid level of the second liquid level sensor is judged;

[0031] S321, if the liquid level in the standby tank is higher than the low value set by the second liquid level sensor, start the second pump to pump the clean water in the standby tank into the clean water tank; when the water level in the clean water tank rises and is higher than the low value set by the first liquid level sensor, turn off the second pump;

[0032] S322, if the liquid level in the standby tank is lower than the low value set by the second liquid level sensor, open the first solenoid valve to replenish water into the clean water tank through the water replenishment pipe. When the water level in the clean water tank rises and is higher than the low value set by the first liquid level sensor, close the first solenoid valve.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention provides a device for short-range denitrification treatment of sewage in a circulating aquaculture system. Through the arrangement of an anaerobic tank, a disinfection tank, a clean water tank, a standby tank, a clean water inlet pipeline, a fry breeding component and a PLC control system, the wastewater in the artificial breeding process of sturgeons is recycled, thereby saving water resources, and the entire process is not affected by the outside world.

[0035] The present invention provides a device for short-range denitrification treatment of sewage in a circulating water aquaculture system. During the aquaculture process, the water inlet flow rate V1 is greater than the discharge flow rate V2 only through the fourth through hole. The continuous inflow of fresh water and discharge of wastewater ensures the water quality of the area where the sturgeons are located, which is beneficial to the healthy growth of the sturgeons and improves the aquaculture efficiency. At the same time, the food residues (including uneaten feed) and sturgeon feces generated during the aquaculture process are centrally cleaned, the ammonia nitrogen content of the wastewater entering the anaerobic tank is reduced, the difficulty of denitrification treatment is reduced, and a biological filler layer is arranged in the anaerobic tank to ensure the effluent water quality.

[0036] The invention provides a device for short-range denitrification treatment of sewage in a circulating aquaculture system, which breaks the traditional sturgeon cage culture process in which the fry to adult fish are raised in only one area, and sets up a transfer area with a non-fixed position, so that the fry raising components can be cleaned in time, so that the sturgeons can always live in a high-quality breeding environment.

[0037] The invention provides a device for treating sewage by short-range denitrification in a circulating aquaculture system. The water level in the clear water tank can be automatically maintained within a reasonable range, thereby ensuring sufficient water supply in the fry breeding component. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is an overall schematic diagram of the present invention;

[0039] Figure 2 is a schematic diagram of an anaerobic tank of the present invention;

[0040] Figure 3 It is a schematic diagram of a clear water tank of the present invention;

[0041] Figure 4 It is a structural schematic diagram of the clean water inlet pipeline of the present invention;

[0042] Figure 5 The present invention Figure 1 E-direction view;

[0043] Figure 6 is a three-dimensional schematic diagram of a fry rearing assembly of the present invention;

[0044] Figure 7 It is a schematic diagram of the structure of the breeding box assembly of the present invention;

[0045] Figure 8 It is a schematic diagram of the structure of the card board assembly of the present invention;

[0046] Fig. 9 It is a schematic diagram of the structure of the plugging tube assembly of the present invention;

[0047] Fig.10 It is a schematic diagram of the lifting assembly structure of the present invention;

[0048] Fig.11 It is a schematic diagram of the drainage pipe structure of the breeding box of the present invention;

[0049] Fig.12 It is a schematic diagram of the internal structure of the fry rearing assembly of the present invention under normal rearing conditions;

[0050] Fig.13 It is a schematic diagram of the internal structure when the moving box and the connecting end plate in the D area of ​​the fry rearing assembly of the present invention are abutted;

[0051] Fig.14 It is a schematic diagram of the internal structure of the fry rearing assembly of the present invention when the card board assembly connected to the A area in the D area is lifted;

[0052] Fig.15 It is a schematic diagram of the internal structure when the D-area blocking pipe assembly of the fry rearing assembly of the present invention is completely separated from the drainage pipe of the breeding box.

[0053] In the figure: 100, anaerobic tank; 110, anaerobic tank body; 120, anaerobic tank water inlet pipe; 130, supporting layer; 140, biological filler layer; 150, anaerobic tank drainage pipe; 151, first pump; 200, disinfection tank; 201, first stop valve; 300, clean water tank; 310, clean water tank body; 320, first liquid level sensor; 330, water supply pipe; 331, first solenoid valve; 340, bypass pipe; 341 , second solenoid valve; 350, clean water tank drainage pipe; 351, second stop valve; 400, spare tank; 410, spare tank body; 420, second liquid level sensor; 430, spare tank drainage pipe; 431, second pump; 432, spare tank check valve; 500, clean water inlet pipe; 510, U-shaped main inlet pipe; 520, first branch inlet pipe; 521, third stop valve; 530, second branch inlet pipe; 531, fourth cut-off valve stop valve; 540, third branch water inlet pipe; 541, fifth stop valve; 550, fourth branch water inlet pipe; 551, sixth stop valve; 600, breeding box assembly; 610, breeding box shell; 611, first through hole; 612, second through hole; 620, partition plate; 621, partition opening; 622, first groove; 630, card plate assembly; 631, pull-out plate; 632, pull-out boss; 633, handle; 700, plugging pipe assembly; 7 01, third through hole; 710, blocking tube; 711, fourth through hole; 712, second groove; 713, tapered end; 720, connecting end plate; 800, lifting assembly; 810, electric cylinder assembly; 820, moving box; 821, fifth through hole; 822, sixth through hole; 900, drainage pipe of breeding box; 910, fixing box; 911, seventh through hole; 912, eighth through hole; 920, U-shaped main outlet pipe; 921, tapered mouth. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be pointed out that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0056] It should be understood that, in the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense.

[0057] Example 1

[0058] See attached Figure 1 To Attachment Fig.15 The present embodiment provides a device for short-range denitrification treatment of sewage in a circulating aquaculture system, comprising sturgeons to be raised, an anaerobic tank 100, a disinfection tank 200, a clean water tank 300, a standby tank 400, a clean water inlet pipe 500, a fry raising component and a PLC control system.

[0059] The anaerobic tank 100 includes an anaerobic tank body 110, an anaerobic tank water inlet pipe 120, a supporting layer 130, a biological filler layer 140 and an anaerobic tank drainage pipe 150. The anaerobic tank water inlet pipe 120 and the anaerobic tank drainage pipe 150 are both connected to the anaerobic tank body 110. The anaerobic tank water inlet pipe 120 is located on one side of the anaerobic tank body 110, and the anaerobic tank drainage pipe 150 is located on the other side of the anaerobic tank body 110. The supporting layer 130 and the biological filler layer 140 are both located inside the anaerobic tank body 110, and the biological filler layer 140 is located on the top of the supporting layer 130. A first water pump 151 is provided on the anaerobic tank drainage pipe 150.

[0060] During the sturgeon breeding process, water is recycled and denitrified in the anaerobic tank 100 to remove nitrate and nitrite pollution in the water. A large amount of wastewater containing high-concentration nitrogen compounds (such as ammonia nitrogen, nitrate, and nitrite) is produced during artificial breeding of sturgeons. If it is directly discharged, it will lead to eutrophication of the water body and seriously damage the water ecological balance. When denitrification is carried out in the anaerobic tank 100, anaerobic bacteria can reduce nitrates to nitrogen gas, thereby effectively removing excess nitrogen compounds in the water body, improving water quality, and avoiding eutrophication of the water body. At the same time, a biological filler layer 140 is arranged in the anaerobic tank 100 to further improve the effluent water quality. A large amount of high-concentration nitrogen compounds produced during artificial breeding of sturgeons mainly comes from sludge, and the main components of the sludge are food residues (including uneaten feed) and sturgeon feces, so it is necessary to reduce the sludge entering the anaerobic tank 100 as much as possible.

[0061] The outlet end of the anaerobic tank 100 is connected to the disinfection tank 200. A first stop valve 201 is provided on the outlet pipe of the disinfection tank 200. The outlet end of the disinfection tank 200 is connected to the clean water tank 300. After the water in the anaerobic tank 100 enters the disinfection tank 200, a neutralizer is first added for neutralization to make its pH value close to 7, and then a disinfectant is added for sterilization.

[0062] The clear water tank 300 includes a clear water tank body 310, a first liquid level sensor 320, a water supply pipe 330, a bypass pipe 340 and a clear water tank drainage pipe 350. The first liquid level sensor 320 is located at the front of the clear water tank body 310. The water supply pipe 330 and the clear water tank drainage pipe 350 are both connected to the clear water tank body 310. The water supply pipe 330 is located at the top of the clear water tank drainage pipe 350. The bypass pipe 340 is located at the bottom of the clear water tank body 310 and is connected thereto. A first solenoid valve 331 is provided on the water supply pipe 330, a second solenoid valve 341 is provided on the bypass pipe 340, and a second stop valve 351 is provided on the clear water tank drainage pipe 350. An aeration device (not shown) is usually provided in the clear water tank 300. The backup pool 400 is connected to the clean water pool 300 and includes a backup pool body 410, a second liquid level sensor 420 and a backup pool drainage pipe 430. The second liquid level sensor 420 is located on the front of the backup pool body 410. The backup pool drainage pipe 430 is provided with a second pumping pump 431 and a backup pool one-way valve 432.

[0063] That is to say, the clean water in the clean water tank 300 flows into the fry breeding assembly through the clean water inlet pipe 500, replenishes the dissolved oxygen in the fry breeding assembly, and dilutes metabolic waste. The wastewater in the fry breeding assembly is discharged into the anaerobic tank 100 for denitrification treatment to reduce its nitrate and nitrite components. The treated wastewater enters the disinfection tank 200, is neutralized first and then disinfected. The clean water after disinfection flows into the clean water tank 300 for aeration to increase the oxygen content of the clean water, thereby completing the recycling of water.

[0064] The clean water inlet pipe 500 includes a U-shaped main water inlet pipe 510, a first branch water inlet pipe 520, a second branch water inlet pipe 530, a third branch water inlet pipe 540 and a fourth branch water inlet pipe 550. The first branch water inlet pipe 520, the second branch water inlet pipe 530, the third branch water inlet pipe 540 and the fourth branch water inlet pipe 550 are all connected to the U-shaped main water inlet pipe 510, the first branch water inlet pipe 520 has a third stop valve 521, the second branch water inlet pipe 530 has a fourth stop valve 531, the third branch water inlet pipe 540 has a fifth stop valve 541, and the fourth branch water inlet pipe 550 has a sixth stop valve 551.

[0065] The fry rearing assembly includes a breeding box assembly 600, a blocking pipe assembly 700, a lifting assembly 800 and a breeding box drainage pipe 900. The movable box 820 on the top of the lifting assembly 800 is located inside the breeding box assembly 600, the fixed box 910 on the top of the breeding box drainage pipe 900 is located inside the breeding box assembly 600, the blocking pipe assembly 700 is located inside the breeding box assembly 600, and the movable box 820 is located on the top of the fixed box 910.

[0066] The breeding box assembly 600 includes a breeding box shell 610, a partition plate 620 and a card assembly 630. The main body of the partition plate 620 is a cross-shaped structure. The breeding box shell 610 is fixedly connected by a support (not shown in the figure). The partition plate 620 is located inside the breeding box shell 610. A first through hole 611 and a second through hole 612 are provided on the bottom plate of the breeding box shell 610. A partition opening 621 is provided on the partition plate 620. The three sides of the partition opening 621 are provided with a first groove 622. The card assembly 630 is engaged in the partition opening 621. The card assembly 630 includes a pull-out plate 631 and a handle 633. The three sides of the pull-out plate 631 are provided with a pull-out boss 632 corresponding to the first groove 622. The handle 633 is located at the top of the pull-out plate 631 and is fixedly connected thereto. The partition plate 620, the mobile box 820 and the breeding box shell 610 divide the fry breeding assembly into four areas A, B, C and D.

[0067] A third through hole 701 is provided at the center of the blocking tube assembly 700. The blocking tube assembly 700 includes a blocking tube 710 and a connecting end plate 720. The connecting end plate 720 is located at the top of the blocking tube 710 and is fixedly connected thereto. A fourth through hole 711 and a second groove 712 are provided on the connecting end plate 720. The second groove 712 is located at the bottom of the fourth through hole 711. The end of the blocking tube 710 away from the connecting end plate 720 is a tapered end 713. In order to better separate food residues and sturgeon feces in the sturgeon breeding area, a filter net is usually provided on the top surface of the third through hole 701, and a filter hole can also be provided on the side of the connecting end plate 720.

[0068] It should be pointed out that the flow rate V1 of water passing through a single branch inlet pipe of the clean water inlet pipe 500, the discharge flow rate V2 of water passing only through the fourth through hole 711 of the two blocking pipe assemblies 700, and the discharge flow rate V3 of water passing through both the fourth through hole 711 and the third through hole 701 of the two blocking pipe assemblies 700 simultaneously have the following relationship: V2<V1<V3.

[0069] The lifting assembly 800 also includes an electric cylinder assembly 810. The moving box 820 is located on the top of the electric cylinder assembly 810 and is fixedly connected thereto. The moving box 820 is a square box body. A fifth through hole 821 is provided around the box body of the moving box 820. A sealing structure is provided between the extending shaft of the electric cylinder assembly 810 and the moving box 820. A sixth through hole 822 is provided on the bottom plate of the moving box 820.

[0070] The drainage pipe 900 of the breeding box also includes a U-shaped main water outlet pipe 920. The fixing box 910 is a square box body. The bottom plate of the fixing box 910 is provided with a seventh through hole 911 and an eighth through hole 912. A sealing structure is arranged between the protruding shaft of the electric cylinder assembly 810 and the eighth through hole 912. A tapered mouth 921 corresponding to the tapered end 713 is arranged on the pipe of the U-shaped main water outlet pipe 920. When the blocking pipe assembly 700 is in a working state, the blocking pipe assembly 700 passes through the sixth through hole 822 and the seventh through hole 911, and the blocking pipe assembly 700 is fixed by the cooperation of the tapered end 713 and the tapered mouth 921. The outer diameter of the protruding shaft of the electric cylinder assembly 810 is smaller than the aperture of the second through hole 612, and the U-shaped main water outlet pipe 920 passes through the first through hole 611.

[0071] The present invention also provides a method for using the lifting device, which includes a sturgeon transfer method S1, a water circulation method S2, and a method for maintaining the water level of a clear water tank S3;

[0072] The sturgeon transfer method S1 comprises the following steps:

[0073] S11, clean water is put into the four areas A, B, C, and D of the fry rearing assembly. At this time, the clean water cannot flow out through the fourth through hole 711. Sturgeons to be reared are put into the D area, C area, and B area of ​​the fry rearing assembly in sequence at preset time intervals. When sturgeons are put into each area, the stop valve at the top of the corresponding area is opened to allow clean water to flow in. Since V2<V1<V3, the water level in the area with sturgeons is maintained within a certain height range;

[0074] S12, feeding is placed in the area where the sturgeons are present, wherein the undigested food residues (including uneaten feed) and the feces of the sturgeons will sink to the bottom of the mobile box 820 in the corresponding area;

[0075] S13, after a preset time, the third stop valve 521 on the A area of ​​the fry rearing assembly is opened and the sixth stop valve 551 on the D area is closed, and the electric cylinder assembly 810 under the D area of ​​the fry rearing assembly is lifted to the movable box 820 in the area and abuts against the connecting end plate 720, and the water level in the D area will drop and be discharged through the third through hole 701, a part of which directly enters the anaerobic tank 100 through the drainage pipe 900 of the breeding box, and a part of which falls into the area between the movable box 820 and the fixed box 910 through the fourth through hole 711. When the water level in the D area drops to a preset value, the card plate assembly 630 between the D area and the A area is raised, and the sturgeons and a small amount of water enter the A area;

[0076] S14, when no liquid is discharged from the mobile box 820 in step S12, the cardboard assembly 630 between the D area and the A area is reset, and the food residues (including uneaten feed) and sturgeon feces in the mobile box 820 are pumped into a designated location for composting by a mud pump (not shown);

[0077] S15, continue to lift the electric cylinder assembly 810 below the D area, so that the plugging pipe assembly 700 is completely separated from the drainage pipe 900 of the breeding box, and the water between the movable box 820 and the fixed box 910 enters the anaerobic tank 100 through the drainage pipe 900 of the breeding box;

[0078] S16, when there is no liquid discharged between the movable box 820 and the fixed box 910, the electric cylinder assembly 810 in the D area is reset, and clean water is injected into the D area. At this time, the clean water cannot flow out through the fourth through hole 711;

[0079] S17, sequentially at preset time intervals, move the sturgeons in area C to area D and clean up area C, move the sturgeons in area B to area C and clean up area B, and move the sturgeons in area A to area B and clean up area A.

[0080] It should be noted that in order to reduce the possible damage to the sturgeons during the transfer process, the plugging pipe assembly 700 and the moving box 820 are usually made of non-metallic materials. In step S14, the sludge pump is generally set as a lifting mechanism, and its connecting platform can be rotated. According to needs, the sludge in the area can be pumped to the designated location for sludge stacking by lifting and moving its connecting platform. Fig.14 In step S13, the card board assembly 630 can be completely separated from the partition board 620 or partially separated.

[0081] The water recycling method S2 comprises the following steps:

[0082] S21, the wastewater in the anaerobic tank 100 is denitrified by anaerobic bacteria, and is further purified by the biological filler layer 140 and then pumped into the disinfection tank 200;

[0083] S22, the water in the disinfection tank 200 is neutralized and then disinfected, and the clean water after disinfection flows into the clean water tank 300;

[0084] S23, aerating the water in the clean water tank 300 to increase the oxygen content of the clean water and provide a water source for the fry breeding assembly.

[0085] The water level in the clean water tank 300 is automatically controlled by a liquid level sensor and a PLC control system.

[0086] The method S3 for maintaining the water level in the clear water tank comprises the following steps:

[0087] S31, when the water level in the clean water tank 300 is higher than the high value set by the first liquid level sensor 320, the first liquid level sensor 320 feeds back a signal to the PLC control system, opens the second solenoid valve 341, and the clean water in the clean water tank 300 flows into the standby tank 400. When the water level in the clean water tank 300 drops and is lower than the high value set by the first liquid level sensor 320, closes the second solenoid valve 341;

[0088] S32, when the water level in the clean water tank 300 is lower than the low value set by the first liquid level sensor 320, the first liquid level sensor 320 feeds back a signal to the PLC control system, and at this time the liquid level of the second liquid level sensor 420 is judged;

[0089] S321, if the liquid level in the standby tank 400 is higher than the low value set by the second liquid level sensor 420, start the second pump 431 to pump the clean water in the standby tank 400 into the clean water tank 300, and when the water level in the clean water tank 300 rises and is higher than the low value set by the first liquid level sensor 320, turn off the second pump 431;

[0090] S322, if the liquid level in the backup tank 400 is lower than the low value set by the second liquid level sensor 420, open the first solenoid valve 331, and replenish water into the clean water tank 300 through the water replenishment pipe 330. When the water level in the clean water tank 300 rises and is higher than the low value set by the first liquid level sensor 320, close the first solenoid valve 331.

[0091] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for treating sewage by short-range denitrification in a circulating aquaculture system, comprising an anaerobic tank (100), a disinfection tank (200) and sturgeons to be raised, characterized in that: It also includes a clean water tank (300), a standby tank (400), a clean water inlet pipeline (500), a fry rearing component and a PLC control system; The outlet end of the anaerobic tank (100) is connected to the disinfection tank (200); The outlet end of the disinfection tank (200) is connected to the clean water tank (300); The standby tank (400) is connected to the clean water tank (300); The clean water in the clean water tank (300) flows into the fry rearing assembly through the clean water inlet pipe (500) to replenish the dissolved oxygen in the fry rearing assembly and dilute metabolic waste. The wastewater in the fry rearing assembly is discharged into the anaerobic tank (100) for denitrification treatment. The treated wastewater enters the disinfection tank (200) for neutralization and then disinfection. The disinfected clean water flows into the clean water tank (300) for aeration to increase the oxygen content of the clean water, thereby completing the recycling of water.

2. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 1, characterized in that: The anaerobic tank (100) comprises an anaerobic tank body (110), an anaerobic tank water inlet pipe (120), a supporting layer (130), a biological filler layer (140) and an anaerobic tank drainage pipe (150); the anaerobic tank water inlet pipe (120) and the anaerobic tank drainage pipe (150) are both connected to the anaerobic tank body (110); the supporting layer (130) and the biological filler layer (140) are both located inside the anaerobic tank body (110); the biological filler layer (140) is located on the top of the supporting layer (130); a first water pump (151) is provided on the anaerobic tank drainage pipe (150); and a first stop valve (201) is provided on the outlet pipe of the disinfection tank (200).

3. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 1, characterized in that: The clean water tank (300) comprises a clean water tank body (310), a first liquid level sensor (320), a water supply pipe (330), a bypass pipe (340) and a clean water tank drainage pipe (350), wherein the first liquid level sensor (320) is located at the front of the clean water tank body (310), the water supply pipe (330) and the clean water tank drainage pipe (350) are both connected to the clean water tank body (310), the bypass pipe (340) is located at the bottom of the clean water tank body (310) and is connected thereto, and the water supply pipe (330) is connected to the bypass pipe (340). A first solenoid valve (331) is provided, a second solenoid valve (341) is provided on the bypass pipe (340), a second stop valve (351) is provided on the clean water tank drainage pipe (350), the backup tank (400) comprises a backup tank body (410), a second liquid level sensor (420) and a backup tank drainage pipe (430), the second liquid level sensor (420) is located on the front of the backup tank body (410), and a second water pump (431) and a backup tank one-way valve (432) are provided on the backup tank drainage pipe (430).

4. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 3, characterized in that: The clean water inlet pipeline (500) comprises a U-shaped main water inlet pipe (510), a first branch water inlet pipe (520), a second branch water inlet pipe (530), a third branch water inlet pipe (540) and a fourth branch water inlet pipe (550); the first branch water inlet pipe (520), the second branch water inlet pipe (530), the third branch water inlet pipe (540) and the fourth branch water inlet pipe (550) are all connected to the U-shaped main water inlet pipe (510); the first branch water inlet pipe (520) is provided with a third stop valve (521); the second branch water inlet pipe (530) is provided with a fourth stop valve (531); the third branch water inlet pipe (540) is provided with a fifth stop valve (541); and the fourth branch water inlet pipe (550) is provided with a sixth stop valve (551).

5. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 1, characterized in that: The fry rearing assembly comprises a breeding box assembly (600), a plugging pipe assembly (700), a lifting assembly (800) and a breeding box drainage pipe (900); a movable box (820) on the top of the lifting assembly (800) is located inside the breeding box assembly (600); a fixed box (910) on the top of the breeding box drainage pipe (900) is located inside the breeding box assembly (600); the plugging pipe assembly (700) is located inside the breeding box assembly (600); and the movable box (820) is located on the top of the fixed box (910).

6. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 5, characterized in that: The breeding box assembly (600) comprises a breeding box shell (610), a partition plate (620) and a cardboard assembly (630); the partition plate (620) is located inside the breeding box shell (610); a first through hole (611) and a second through hole (612) are provided on the bottom plate of the breeding box shell (610); a partition opening (621) is provided on the partition plate (620); three sides of the partition opening (621) are provided with first grooves (622); the cardboard assembly (630) is engaged in the partition opening (621); the cardboard assembly (630) comprises a pull-out plate (631) and a handle (633); the handle (633) is located on the top of the pull-out plate (631) and is fixedly connected thereto; the partition plate (620), the mobile box (820) and the breeding box shell (610) divide the fry breeding assembly into four areas, namely, A, B, C and D.

7. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 6, characterized in that: A third through hole (701) is provided at the center of the blocking tube assembly (700), the blocking tube assembly (700) comprises a blocking tube (710) and a connecting end plate (720), a fourth through hole (711) and a second groove (712) are provided on the connecting end plate (720), and an end of the blocking tube (710) away from the connecting end plate (720) is a tapered end (713).

8. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 7, characterized in that: The flow rate V1 of water passing through a single branch water inlet pipe of the clean water inlet pipe (500), the discharge flow rate V2 of water passing only through the fourth through holes (711) of the two blocking pipe assemblies (700), and the discharge flow rate V3 of water passing simultaneously through the fourth through holes (711) and the third through holes (701) of the two blocking pipe assemblies (700) have the following relationship: V2<V1<V3.

9. The device for treating sewage by short-range denitrification in a circulating aquaculture system according to claim 8, characterized in that: The lifting assembly (800) further comprises an electric cylinder assembly (810), the moving box (820) is located on the top of the electric cylinder assembly (810) and is fixedly connected thereto, a fifth through hole (821) is provided around the box body of the moving box (820), a sixth through hole (822) is provided on the bottom plate of the moving box (820), the aquaculture box drainage pipe (900) further comprises a U-shaped main water outlet pipe (920), a seventh through hole (911) and an eighth through hole (912) are provided on the bottom plate of the fixed box (910), and a conical opening (921) corresponding to the conical end (713) is provided on the pipe of the U-shaped main water outlet pipe (920).

10. The method for using the device for short-range denitrification treatment of sewage in a circulating aquaculture system according to any one of claims 6 to 9, characterized in that: The method of use includes a sturgeon transfer method S1, a water circulation method S2, and a method of maintaining the water level in a clear water tank S3; The sturgeon transfer method S1 comprises the following steps: S11, putting clean water into the four areas A, B, C and D of the fry rearing component, at which time the clean water cannot flow out through the fourth through hole (711), and putting sturgeons to be reared into the D area, C area and B area of ​​the fry rearing component in sequence at preset time intervals; S12, placing feed in the area where the sturgeons are, wherein the undigested food residues and sturgeon feces will sink to the bottom of the mobile box (820) in the corresponding area; S13, after a preset time, the third stop valve (521) on the A area of ​​the fry rearing assembly is opened and the sixth stop valve (551) on the D area is closed, and the electric cylinder assembly (810) under the D area of ​​the fry rearing assembly is lifted to the point where the movable box (820) of the area abuts against the connecting end plate (720), and the water level in the D area will drop and be discharged through the third through hole (701), with a portion of the water directly entering the anaerobic tank (100) through the drainage pipe (900) of the breeding box, and a portion of the water falling into the area between the movable box (820) and the fixed box (910) through the fourth through hole (711). When the water level in the D area drops to a preset value, the cardboard assembly (630) between the D area and the A area is raised, and the sturgeons and a small amount of water enter the A area; S14, resetting the card plate assembly (630) between the D area and the A area, and pumping the food residues and sturgeon feces in the mobile box (820) into a designated location for composting by means of a mud pump; S15, continue to lift the electric cylinder assembly (810) below the D area, so that the plugging pipe assembly (700) is completely separated from the drainage pipe (900) of the breeding box, and the water between the movable box (820) and the fixed box (910) enters the anaerobic tank (100) through the drainage pipe (900) of the breeding box; S16, resetting the electric cylinder assembly (810) in the D region, and injecting clean water into the D region, so that the clean water cannot flow out through the fourth through hole (711); S17, sequentially at preset time intervals, moving the sturgeons in area C to area D and cleaning area C, moving the sturgeons in area B to area C and cleaning area B, and moving the sturgeons in area A to area B and cleaning area A; The water recycling method S2 comprises the following steps: S21, the wastewater in the anaerobic tank (100) is subjected to denitrification treatment, further purified by the biological filler layer (140), and then pumped into the disinfection tank (200); S22, the water in the disinfection tank (200) is first neutralized and then disinfected, and the clean water after disinfection flows into the clean water tank (300); S23, aerating the water in the clean water tank (300) to increase the oxygen content of the clean water and provide a water source for the fry breeding assembly; The water level in the clean water tank (300) is automatically controlled by a liquid level sensor and a PLC control system; The method S3 for maintaining the water level in the clear water tank comprises the following steps: S31, when the water level in the clean water tank (300) is higher than the high value set by the first liquid level sensor (320), the first liquid level sensor (320) feeds back a signal to the PLC control system, and the second solenoid valve (341) is opened, and the clean water in the clean water tank (300) flows into the standby tank (400); when the water level in the clean water tank (300) drops and is lower than the high value set by the first liquid level sensor (320), the second solenoid valve (341) is closed; S32, when the water level in the clear water tank (300) is lower than the low value set by the first liquid level sensor (320), the first liquid level sensor (320) feeds back a signal to the PLC control system, and at this time, the liquid level of the second liquid level sensor (420) is judged; S321, if the liquid level in the standby tank (400) is higher than the low value set by the second liquid level sensor (420), the second water pump (431) is started to pump the clean water in the standby tank (400) into the clean water tank (300); when the water level in the clean water tank (300) rises and is higher than the low value set by the first liquid level sensor (320), the second water pump (431) is turned off; S322, if the liquid level in the standby tank (400) is lower than the low value set by the second liquid level sensor (420), the first solenoid valve (331) is opened, and water is replenished into the clean water tank (300) through the water replenishment pipe (330); when the water level in the clean water tank (300) rises and is higher than the low value set by the first liquid level sensor (320), the first solenoid valve (331) is closed.

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