High-efficiency denitrification device for breeding wastewater

Abstract

The utility model relates to the technical field of wastewater treatment equipment, and particularly discloses an efficient denitrification device for aquaculture wastewater, which comprises a tank body, a mounting frame is arranged on the tank body, a rotating shaft and a rotating sleeve are rotatably arranged on the mounting frame in the vertical direction, the rotating shaft is located in the rotating sleeve, and the rotating shaft is located in the rotating sleeve. A plurality of aeration pipes are arranged at the bottom end of the rotating shaft, a plurality of scattering rods are arranged at the bottom end of the rotating sleeve, a motor is fixedly connected to the mounting frame, and a transmission assembly used for driving the rotating shaft and the rotating sleeve to rotate in opposite directions is arranged on the mounting frame. The device has the effect of increasing the utilization rate of oxygen in wastewater.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment equipment technology, and in particular to a high-efficiency denitrification device for aquaculture wastewater. Background Technology

[0002] Livestock wastewater, especially that from pig farms, chicken farms, and cattle farms, is typically characterized by high concentrations of organic matter, high ammonia nitrogen, high suspended solids, and low carbon-to-nitrogen ratios. Among these, ammonia nitrogen pollution is particularly prominent. Untreated nitrogen-containing wastewater discharged into water bodies will lead to eutrophication, depletion of dissolved oxygen, and the production of toxic substances, severely damaging the aquatic ecosystem.

[0003] There are multiple process routes for wastewater treatment. Wastewater is sequentially treated through a collection tank, solid-liquid separation tank, anoxic tank, primary pre-reaction tank, SBR tank, secondary transition tank, flocculation sedimentation tank, ozone disinfection tank, sand filter tank, and metering discharge tank until it meets the discharge standards. This is one of the mainstream processes.

[0004] As the core treatment unit in the modified process chain, the SBR (Sedimentation Batch Reactor) typically achieves a complete cycle operation including influent, reaction (aeration), sedimentation, effluent discharge, and idle period. During the aeration reaction stage of the SBR, to meet the high dissolved oxygen requirements of aerobic microorganisms such as nitrifying bacteria, a large amount of air or oxygen is often introduced into the mixed liquor through aeration pipes. Since aquaculture wastewater usually has a high suspended solids content, to reduce the clogging rate of the aeration pipes, the holes in the aeration pipes are often made with medium to large diameter pores.

[0005] Regarding the aforementioned technologies, the inventors believe that the following defects exist: aeration pipes typically spray air vertically, resulting in excessively high airflow speed and a short path. Furthermore, the airflow from medium to large aperture aeration pipes produces large bubbles after they are formed, leading to excessively low oxygen utilization. Utility Model Content

[0006] In order to improve the problem of low oxygen utilization in the airflow ejected from the aeration pipe, this application provides a high-efficiency denitrification device for aquaculture wastewater.

[0007] The high-efficiency nitrogen removal device for aquaculture wastewater provided in this application adopts the following technical solution:

[0008] A high-efficiency nitrogen removal device for aquaculture wastewater includes a tank body with a mounting frame. A rotating shaft and a rotating sleeve are rotatably mounted on the mounting frame in a vertical direction. The rotating shaft is located inside the rotating sleeve. Multiple aeration pipes are located at the bottom end of the rotating shaft, and multiple dispersing rods are located at the bottom end of the rotating sleeve. A motor is fixedly connected to the mounting frame, and the dispersing rods are located above the aeration pipes. A transmission assembly is mounted on the mounting frame, configured to synchronously drive the rotating shaft and the rotating sleeve to rotate in opposite directions via the motor.

[0009] Optionally, the transmission assembly includes a first bevel gear disposed on the rotating shaft, a second bevel gear disposed on the rotating sleeve, and a third bevel gear disposed at the motor output end, wherein the third bevel gear meshes with the first bevel gear and the second bevel gear respectively.

[0010] Optionally, the transmission assembly includes a driving gear, a driven gear, and a reversing gear. The driving gear and the driven gear are one-to-one and there are two of each. The two driving gears are coaxially fixed to the output shaft of the motor. The two driven gears are coaxially fixed to the rotating shaft and the rotating sleeve, respectively. The reversing gear meshes with one set of the driving gear and the driven gear, and the other set of the driving gear meshes with the driven gear.

[0011] Optionally, a one-way bearing is coaxially fixed to the rotating sleeve, and the transmission assembly is connected to the rotating sleeve through the one-way bearing.

[0012] Optionally, the dispersing rod has a dispersing mesh perforated on its periphery.

[0013] Optionally, the number of air holes on the aeration pipe gradually increases from the end closer to the rotating shaft to the end farther away from the rotating shaft.

[0014] Optionally, the number of the dispersing rods is greater than the number of the aeration pipes.

[0015] Optionally, the surface of the dispersing rod is provided with a rough layer.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. The dispersing rod and the aeration pipe rotate in opposite directions. The rotating aeration pipe provides horizontal velocity to the bubbles formed by the airflow after spraying, so as to extend the movement path of the bubbles in the wastewater. At the same time, the aeration pipe, together with the dispersing rod, creates a strong shear layer and turbulence zone in the wastewater. When the bubbles pass through these zones, the shear force pulls and tears the large bubbles into smaller bubbles. The turbulence also increases the probability of collision and breakage between bubbles. Some bubbles also directly collide with the rotating dispersing rod, further aggravating the breakage of the bubbles. This improves the uniformity and contact area of ​​the bubbles in the wastewater. Compared with the large bubbles with greater buoyancy, the small bubbles rise at a slower speed, thus effectively increasing the utilization rate of oxygen in the wastewater.

[0018] 2. Compared with directly increasing the gas supply rate to increase the dissolved oxygen content, the energy consumption of the motor is controllable and lower, while the energy consumption of air compressors and other air sources increases dramatically with the increase of flow rate. The connection points of rotating mechanisms such as rotating shafts and rotating sleeves are all located above the wastewater, which is not easily affected by bacteria and debris in the wastewater, thus effectively reducing the maintenance frequency.

[0019] 3. When the motor is running, the third bevel gear drives the first bevel gear and the second bevel gear to rotate, causing the first bevel gear and the second bevel gear to rotate in opposite directions on the same axis. That is, the aeration pipe and the dispersing rod rotate in opposite directions. This structure is relatively simple and easy to maintain.

[0020] 4. When the motor is running, the driving gear rotates, and the driving gear at the same height as the driven gear on the rotating shaft drives the reversing gear meshing with it to rotate, which in turn drives the driven gear on the rotating shaft to rotate; the driving gear at the same height as the driven gear on the rotating sleeve drives the driven gear meshing with it to rotate, thus finally completing the reverse rotation of the rotating shaft and the rotating sleeve. This structure is relatively simple. The reversing gear can also be replaced with a speed-changing gear to change the rotational speed between the rotating shaft and the rotating sleeve. This structure has a strong load-bearing capacity and low cost. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0022] Figure 2 yes Figure 1 A partial structural diagram showing the hidden pool body and mounting frame in the middle;

[0023] Figure 3 This is a cross-sectional structural diagram of Embodiment 1 of this application used to illustrate the disintegration rod and the disintegration net;

[0024] Figure 4 This is a partial structural schematic diagram of the driving gear, driven gear, mounting bracket, rotating sleeve, rotary joint, and motor, as shown in Embodiment 2 of this application.

[0025] Figure 5 This is a schematic diagram of the structure of the rotating shaft, rotary joint, rotating sleeve, transmission assembly and one-way bearing, as shown in Embodiment 2 of this application.

[0026] Reference numerals in the attached drawings: 1. Pool body; 11. Mounting frame; 21. Rotating shaft; 22. Aeration pipe; 223. Rotary joint; 31. Rotating sleeve; 32. Dispersing rod; 321. Dispersing net; 4. Motor; 51. First bevel gear; 52. Second bevel gear; 53. Third bevel gear; 61. Driving gear; 62. Driven gear; 63. Reversing gear; 7. One-way bearing. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0028] This application discloses an efficient nitrogen removal device for aquaculture wastewater.

[0029] Example 1

[0030] Reference Figure 1 , Figure 2 and Figure 3 The high-efficiency nitrogen removal device for aquaculture wastewater includes a tank body 1, on which a mounting frame 11 is fixedly connected. The tank body 1 can be cast-in-place or constructed on-site, or it can be prefabricated from materials such as steel. A rotating shaft 21 and a rotating sleeve 31 are rotatably mounted vertically on the mounting frame 11. The rotating shaft 21 is located inside the rotating sleeve 31. Multiple aeration pipes 22 are installed at the bottom end of the rotating shaft 21. The middle part of the rotating shaft 21 is hollow and connected to the aeration pipes 22. A rotary joint 223 is connected to the end of the rotating shaft 21 away from the aeration pipes 22. An air source is connected to the rotary joint 223. The airflow path is as follows: air source - rotary joint 223 - rotating shaft 21 - aeration pipe 22. The air source can be a blower or air compressor, or it can be a main air pipe with high-pressure gas. When the air source is a main air pipe, air can be supplied to the multiple aeration pipes 22 in the tank body 1 through the main air pipe. Multiple dispersing rods 32 are provided at the bottom of the rotating sleeve 31, that is, the dispersing rods 32 are located above the aeration pipe 22. The dispersing rods 32 and the aeration pipe 22 are arranged radially. The dispersing rods 32 and the aeration pipe 22 are staggered in the vertical direction. Reinforcing rods can be installed between adjacent dispersing rods 32 and adjacent aeration pipes 22. Reinforcing rods can also be installed between the dispersing rods 32 and the rotating shaft 21, and between the aeration pipe 22 and the rotating sleeve 31, to enhance the strength of the dispersing rods 32 and the aeration pipe 22. A motor 4 is fixedly connected to the mounting frame 11. A transmission assembly is provided on the mounting frame 11. The transmission assembly is configured to synchronously drive the rotating shaft 21 and the rotating sleeve 31 to rotate in opposite directions through the motor 4.

[0031] During aeration, motor 4 is turned on, and its power is transmitted to rotating shaft 21 and rotating sleeve 31 through the transmission assembly. Rotating shaft 21 and rotating sleeve 31 rotate coaxially in opposite directions, causing dispersing rod 32 and aeration pipe 22 to rotate in opposite directions. The rotating aeration pipe 22 provides horizontal velocity for the bubbles formed by the sprayed airflow, thereby extending the movement path of the bubbles in the wastewater. At the same time, the aeration pipe 22, in conjunction with dispersing rod 32, creates a strong shear layer and turbulence zone in the wastewater. When bubbles pass through these zones, the shear force pulls and tears large bubbles into smaller bubbles. Turbulence also increases the probability of collision and breakage between bubbles. Some bubbles also directly collide with the rotating dispersing rod 32, further aggravating bubble breakage. This improves the uniformity and contact area of ​​bubbles in the wastewater. Compared to large bubbles with greater buoyancy, small bubbles rise more slowly, thus effectively increasing the utilization rate of oxygen in the airflow.

[0032] Although this application adds a motor 4, which would intuitively lead to increased energy consumption, compared to directly increasing the air supply rate to increase dissolved oxygen content, the energy consumption of motor 4 is controllable and lower. Air sources such as air compressors, on the other hand, experience a dramatic increase in energy consumption with increasing flow rate. Furthermore, the connection points of the rotating mechanisms, such as the rotating shaft 21 and rotating sleeve 31, are all located above the wastewater, making them less susceptible to the influence of bacteria and debris in the wastewater, thus effectively reducing maintenance frequency.

[0033] Reference Figure 3 The transmission assembly includes a first bevel gear 51 coaxially fixed to the rotating shaft 21, a second bevel gear 52 coaxially fixed to the rotating sleeve 31, and a third bevel gear 53 coaxially fixed to the output shaft of the motor 4. The first bevel gear 51 and the second bevel gear 52 are arranged opposite to each other, and the third bevel gear 53 meshes with the first bevel gear 51 and the second bevel gear 52 respectively.

[0034] When the motor 4 is running, the third bevel gear 53 drives the first bevel gear 51 and the second bevel gear 52 to rotate, causing the first bevel gear 51 and the second bevel gear 52 to rotate in opposite directions on the same axis. That is, the aeration pipe 22 and the dispersing rod 32 rotate in opposite directions. This structure is relatively simple and easy to maintain.

[0035] Reference Figure 2 A one-way bearing 7 is coaxially fixed to the rotating sleeve 31, and the second bevel gear 52 is connected to the rotating sleeve 31 through the one-way bearing 7. That is, the rotating shaft 21 and the rotating sleeve 31 can be driven to rotate by the motor 4. However, when the motor 4 stops and it is necessary to maintain the bottom of the tank 1 or adjust the position between the aeration pipe 22 and the dispersing rod 32, it can be manually rotated and adjusted in the opposite direction of the rotation of the rotating sleeve 31. The structure is simple and the operation is convenient.

[0036] Reference Figure 1 , Figure 2 and Figure 3 The number of dispersing rods 32 is greater than that of aeration pipes 22. The specific number of aeration pipes 22 and dispersing rods 32 can be set according to the size of the tank 1, the power of the air source, and other working conditions. The peripheral wall of the dispersing rods 32 is welded or bolted to a dispersing mesh 321, and the dispersing mesh 321 has perforations of the diameter of the dispersing rods 32. The mesh size of the dispersing mesh 321 can be selected according to actual working conditions to avoid clogging due to excessively small mesh and weak shearing effect due to excessively large mesh. A larger number of dispersing rods 32 and dispersing mesh 321 increases the contact probability between bubbles and the dispersing mesh 321, thereby enhancing the breaking effect of large bubbles. The surface of the dispersing rods 32 is provided with a rough layer, which can be multiple small protrusions or spiral patterns fixed to the surface of the dispersing rods 32. The side of the dispersing rod 32 facing its rotation direction during operation has a cutting edge to enhance the shearing and dispersing effect of the dispersing rods 321 on the bubbles entering the dispersing mesh 321.

[0037] Reference Figure 3 The number of air holes on the aeration pipe 22 gradually increases from the end closer to the rotating shaft 21 to the end farther away from the rotating shaft 21, thereby increasing the bubble density on the side of the aeration pipe 22 away from the rotating shaft 21 and improving the uniformity of bubbles in the wastewater, which in turn improves the uniformity of dissolved oxygen concentration in different areas of the wastewater. Branch pipes with aeration holes can also be added at various locations on the aeration pipe 22 according to actual operating conditions, connecting the branch pipes to the aeration pipe 22 to further alter the bubble content in different parts of the wastewater.

[0038] The implementation principle of the efficient nitrogen removal device for aquaculture wastewater in this application embodiment is as follows: During aeration, the motor 4 is turned on, and the third bevel gear 53 drives the first bevel gear 51 and the second bevel gear 52 to rotate, so that the first bevel gear 51 and the second bevel gear 52 rotate in opposite directions on the same axis, thereby causing the aeration pipe 22 and the dispersing rod 32 to rotate in opposite directions. The rotating aeration pipe 22 provides horizontal velocity for the bubbles formed by the airflow after spraying, so as to extend the movement path of the bubbles in the wastewater. At the same time, the aeration pipe 22, together with the dispersing rod 32, forms a strong shear layer and turbulence zone in the wastewater, so that large bubbles are broken into small bubbles when passing through these areas. Some bubbles also directly collide with the rotating dispersing rod 32 and the dispersing net 321, further aggravating the breakup of bubbles, thereby effectively increasing the utilization rate of oxygen in the airflow.

[0039] Example 2

[0040] Reference Figure 4 and Figure 5 The difference between this embodiment and Embodiment 1 is that the transmission assembly includes a driving gear 61, a driven gear 62, and a reversing gear 63. The driving gear 61 and the driven gear 62 are one-to-one and there are two of each. The two driving gears 61 are coaxially fixed to the output shaft of the motor 4. The two driven gears 62 are coaxially fixed to the rotating shaft 21 and the rotating sleeve 31 respectively through one-way bearings 7. The driving gear 61 and the driven gear of the same height form a group. The reversing gear 63 is meshed with one group of driving gears 61 and driven gears 62, and the other group of driving gears 61 and driven gears 62 are directly meshed. In this application, the reversing gear 63 is meshed with the driven gear 62 located on the rotating shaft 21. The driving gear 61, driven gear 62, and reversing gear 63 can all be spur gears or helical gears.

[0041] When the motor 4 is running, the drive gear 61 rotates. The drive gear 61, which is at the same height as the driven gear 62 on the rotating shaft 21, drives the reversing gear 63 that meshes with it to rotate, which in turn drives the driven gear 62 on the rotating shaft 21 to rotate. The drive gear 61, which is at the same height as the driven gear 62 on the rotating sleeve 31, drives the driven gear 62 that meshes with it to rotate, thus finally completing the reverse rotation of the rotating shaft 21 and the rotating sleeve 31. This structure is also relatively simple.

[0042] The reversing gear 63 can also be replaced by a variable speed gear (i.e., a multi-layered coaxial gear with different gear ratios) to change the rotational speed between the rotating shaft 21 and the rotating sleeve 31.

[0043] In other feasible embodiments, the driving gear 61 and the driven gear 62 are replaced by a driving pulley and a driven pulley, respectively, and the reversing gear 63 is replaced by a reversing wheel. The driving pulley, which is at the same height as the rotating shaft 21, drives the reversing wheel to rotate via a belt, and the reversing wheel drives the driven pulley to rotate via a belt; the driving pulley, which is at the same height as the driven pulley on the rotating sleeve 31, drives the driven pulley to rotate via a belt, so as to achieve the effect of reverse rotation of the rotating shaft 21 and the rotating sleeve 31.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-efficiency nitrogen removal device for aquaculture wastewater, comprising a tank (1), characterized in that: The pool body (1) is provided with an installation frame (11). The installation frame (11) is provided with a rotating shaft (21) and a rotating sleeve (31) rotatably in the vertical direction. The rotating shaft (21) is located inside the rotating sleeve (31). Multiple aeration pipes (22) are provided at the bottom end of the rotating shaft (21). Multiple dispersing rods (32) are provided at the bottom end of the rotating sleeve (31). A motor (4) is fixedly connected to the installation frame (11). The dispersing rods (32) are located above the aeration pipes (22). A transmission assembly is provided on the installation frame (11). The transmission assembly is configured to synchronously drive the rotating shaft (21) and the rotating sleeve (31) to rotate in opposite directions through the motor (4).

2. The high-efficiency nitrogen removal device for aquaculture wastewater according to claim 1, characterized in that: The transmission assembly includes a first bevel gear (51) disposed on the rotating shaft (21), a second bevel gear (52) disposed on the rotating sleeve (31), and a third bevel gear (53) disposed at the output end of the motor (4). The third bevel gear (53) meshes with the first bevel gear (51) and the second bevel gear (52) respectively.

3. The high-efficiency nitrogen removal device for aquaculture wastewater according to claim 1, characterized in that: The transmission assembly includes a drive gear (61), a driven gear (62), and a reversing gear (63). The drive gear (61) corresponds one-to-one with the driven gear (62), and there are two of each. The two drive gears (61) are coaxially fixed to the output shaft of the motor (4). The two driven gears (62) are coaxially fixed to the rotating shaft (21) and the rotating sleeve (31), respectively. The reversing gear (63) meshes with one set of drive gears (61) and driven gears (62), and the other set of drive gears (61) meshes with the driven gears (62).

4. The high-efficiency nitrogen removal device for aquaculture wastewater according to claim 1, characterized in that: A one-way bearing (7) is coaxially fixed to the rotating sleeve (31), and the transmission assembly is connected to the rotating sleeve (31) through the one-way bearing (7).

5. The high-efficiency nitrogen removal device for aquaculture wastewater according to claim 1, characterized in that: The dispersing rod (32) has a dispersing mesh (321) hollowed out on its periphery.

6. The high-efficiency nitrogen removal device for aquaculture wastewater according to claim 1, characterized in that: The number of air holes on the aeration pipe (22) gradually increases from the end closer to the rotating shaft (21) to the end farther away from the rotating shaft (21).

7. The high-efficiency nitrogen removal device for aquaculture wastewater according to claim 1, characterized in that: The number of the dispersing rods (32) is greater than the number of the aeration pipes (22).

8. The high-efficiency nitrogen removal device for aquaculture wastewater according to claim 1, characterized in that: The surface of the dispersing rod (32) is provided with a rough layer.

Images