A cultivation device for high accumulation rate short-range nitrification activated sludge

Abstract

The present invention discloses a cultivation device for high-accumulation-rate, short-range nitrification activated sludge, comprising a fixed frame and a reaction barrel mounted on the fixed frame. The bottom of the reaction barrel is also provided with an aeration device, and the interior of the reaction barrel is also provided with a stirring mechanism, the stirring mechanism comprising a drive motor, a stirring shaft, and a stirring paddle. The drive motor is mounted above the reaction barrel, the stirring shaft is located inside the reaction barrel, the top end of the stirring shaft is rotatably connected to the barrel body via a bearing, the stirring shaft is driven to rotate by the drive motor, and the outer wall of the stirring shaft is also provided with a stirring paddle. The present invention addresses the problem in the prior art that when mixing a sludge mixture with an additive, the stirring is not uniform during the stirring, thereby affecting the quality of the activated sludge. The present invention has the advantages of better dispersion of the additive in the sludge mixture and better mixing effect when the additive is added to adjust the sludge mixture.

Description

Technical Field

[0001] The invention relates to the technical field of activated sludge cultivation, in particular to a cultivation device for high-accumulation-rate short-range nitrification activated sludge. Background Art

[0002] Short-cut nitrification refers to the process of generating nitrite from NH3 instead of nitrate, and directly generating N2 from nitrite. This is called short-cut denitrification. As a sewage treatment process, short-cut nitrification has the characteristics of reduced energy consumption, carbon source saving, less sludge production, and less land occupation compared to traditional denitrification processes. It also has great application value for wastewater with high nitrogen content and insufficient carbon source.

[0003] In the prior art, during the cultivation process of short-range nitrification activated sludge, the sewage mixture is generally discharged into the reactor for aeration and various data are tested. When the pH value does not meet the standard, or other test data do not meet the standard, various additives need to be added to adjust the various test parameters of the sludge mixture so that the activated sludge meets the use requirements. When adding additives, it is inevitable to stir and mix the additives with the mixture. When mixing the mixture and the additives, due to the large volume of the mixed liquid and the large volume of the reactor, the stirring will not be uniform enough, and upper and lower stratification will easily occur, affecting the quality of the activated sludge.

[0004] In response to the above technical problems, the present invention discloses a cultivation device for high-accumulation-rate short-range nitrification activated sludge. The present invention has the advantages of better dispersion of additives in the sludge mixture and better mixing effect when additives are added to adjust the sludge mixture. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a cultivation device for high-accumulation rate short-range nitrification activated sludge to solve the technical problems in the existing technology that when mixing the sludge mixed liquor and additives, the mixed liquor volume is large and the reactor volume is too large, resulting in uneven stirring, easy upper and lower stratification, and affecting the quality of the activated sludge. The present invention has the advantages of better dispersion of the additives in the sludge mixture and better mixing effect when the additives are added to adjust the sludge mixed liquor.

[0006] The present invention is achieved through the following technical solutions: The present invention discloses a culture device for high-accumulation-rate short-range nitrification activated sludge, comprising a fixed frame and a reaction barrel mounted on the fixed frame, an aeration device being further provided at the bottom of the reaction barrel, a stirring mechanism being further provided inside the reaction barrel, the stirring mechanism comprising a drive motor, a stirring shaft and a stirring paddle, the drive motor being mounted above the reaction barrel, the stirring shaft being located inside the reaction barrel, the top end of the stirring shaft being rotatably connected to the barrel body via a bearing, the stirring shaft being driven to rotate by the drive motor, and a stirring paddle being further provided on the outer wall of the stirring shaft;

[0007] The stirring shaft is configured to include an outer shaft, an inner tube, a submersible pump and a connecting shaft. A central through hole is provided at the center of the outer shaft, which passes through the upper and lower end surfaces. A dosing chamber is also provided inside the outer shaft, and the dosing chamber is arranged around the central through hole. A dosing hole connected to the dosing chamber is provided on the inner wall of the central through hole. The stirring paddle is fixedly provided on the outer wall of the outer shaft. An inner tube is slidably inserted into the interior of the central through hole. The outer wall of the inner tube and the inner wall of the central through hole are slidingly sealed. A submersible pump is installed at the bottom of the reaction barrel. The bottom end of the inner tube is connected to the water outlet of the submersible pump. The top of the outer shaft is fixedly connected to the connecting shaft, and a water outlet cavity connected to the central through hole is provided at the bottom of the connecting shaft, and a water outlet hole is provided on the outer wall of the water outlet cavity.

[0008] Furthermore, the reaction barrel consists of a barrel body and a barrel cover, the barrel body and the barrel cover are detachably connected by screws, and a heating cavity layer is provided on the outside of the reaction barrel.

[0009] Furthermore, the outer wall of the inner tube covers and seals the dosing hole, and a connecting hole is opened on the outer wall of the inner tube, and the connecting hole and the dosing hole are at the same horizontal position.

[0010] Furthermore, the connecting shaft and the driving motor are connected in transmission via a connecting assembly, and a control groove is provided on the upper end surface of the connecting shaft, and the control groove is polygonal.

[0011] Furthermore, the connecting component includes a rotating column and a control column. The rotating column is rotatably connected to the barrel cover, and the two ends of the rotating column extend to the top and bottom of the barrel cover respectively. The control column is fixedly arranged at the bottom end of the rotating column, and the control column and the control groove are both polygonal, and the outer wall of the control column is slidably plugged into the control groove.

[0012] Furthermore, a gear 1 is fixedly sleeved on the outer wall of the rotating column at one end above the barrel cover, and a gear 2 is fixedly provided on the output end of the driving motor, and the gear 1 is meshed with the gear 2.

[0013] Furthermore, a dosing tube is fixedly provided on the inner wall of the central through hole, and one end of the dosing tube is connected to the interior of the dosing chamber, the other end of the dosing tube extends to the interior of the control groove and is fixedly connected to the connecting shaft, a connecting tube is fixedly provided inside the rotating column, and one end of the connecting tube extends to the top of the rotating column, the other end of the connecting tube extends to the bottom of the control column, and the end of the connecting tube located below the control column is slidably connected to one end of the dosing tube.

[0014] Furthermore, one end of the connecting tube located below the control column is in sliding and sealing cooperation with one end of the dosing tube.

[0015] The present invention has the following advantages:

[0016] The present invention is provided with a stirring mechanism, a stirring shaft, an outer shaft, an inner tube and a submersible pump, so that when adding additives, the submersible pump can continuously extract the mixed liquid at the bottom of the reaction barrel into the interior of the inner tube, and discharge it into the central through hole through the top opening of the inner tube, and then enter the water outlet cavity and be discharged through the water outlet hole. When the sludge mixed liquid continuously flows through the interior of the inner tube, the additive in the dosing cavity will enter the interior of the inner tube through the dosing hole and the connecting hole, so that the additive is added along with the flowing sludge mixed liquid, so that the additive is added during the circulation of the sludge mixed liquid, so that the additive and the sludge are mixed. The mixing effect of the mixed liquid is more uniform, and the addition of additives is more dispersed. In addition, the sludge mixed liquid at the bottom of the reaction barrel can be continuously circulated from the bottom to the top. In this process, the additive will be added to the flowing sludge mixed liquid, thereby avoiding the situation where the addition of additives is layered up and down. Therefore, the mixing effect can be improved. By setting an inner tube and connecting the inner tube to a submersible pump, when the outer shaft rotates for stirring, the inner tube will not be able to rotate, so that the dosing hole and the connecting hole will be intermittently connected. Therefore, the addition of additives can be intermittent, making the addition of additives more dispersed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the reaction barrel of the present invention;

[0019] Figure 3 Schematic diagram of the internal structure of the reaction barrel of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the outer shaft and the connecting shaft of the present invention;

[0021] Figure 5 This is a schematic cross-sectional view of the outer shaft and the connecting shaft of the present invention;

[0022] Figure 6 For the present invention Figure 2 A local enlarged structural diagram of point A;

[0023] Figure 7 For the present invention Figure 5 A schematic diagram of the partially enlarged structure at point C;

[0024] Figure 8 For the present invention Figure 5 A schematic diagram of the local enlarged structure at D;

[0025] Figure 9 For the present invention Figure 5 A schematic diagram of the local enlarged structure at E;

[0026] Figure 10 For the present invention Figure 1 Schematic diagram of the local enlarged structure at F.

[0027] In the figure: 1. Fixed frame; 2. Reaction barrel; 3. Rotary joint; 4. Aeration device; 5. Heating cavity layer; 6. Stirring mechanism; 7. Central through hole; 8. Dosing cavity; 9. Dosing hole; 10. Connecting hole; 11. Water outlet cavity; 12. Water outlet hole; 13. Connecting assembly; 14. Control groove; 15. Gear 1; 16. Gear 2; 17. Dosing pipe; 18. Connecting pipe; 21. Barrel body; 22. Barrel cover; 61. Drive motor; 62. Stirring shaft; 63. Stirring paddle; 621. Outer shaft; 622. Inner tube; 623. Submersible pump; 624. Connecting shaft; 131. Rotating column; 132. Control column. Implementation Method

[0028] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and a detailed implementation method and specific operation process are given. However, the scope of protection of the present invention is not limited to the following embodiment. In the description of the present invention, words indicating directions or positional relationships such as "front", "rear", "left", and "right" are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention. Example

[0029] Example 1 discloses a culture device for high accumulation rate short-range nitrification activated sludge, such as Figures 1-10 As shown, it includes a fixing frame 1 and a reaction barrel 2 installed on the fixing frame 1, as shown in FIG. Figure 1 and Figure 2As shown, the bottom of the reaction barrel 2 is also provided with an aeration device 4. Specifically, the reaction barrel 2 can be turned over on the fixing frame 1. The reaction barrel 2 is made of metal and consists of a barrel body 21 and a barrel cover 22. The barrel body 21 and the barrel cover 22 are detachably connected by screws, so that when sludge culture is carried out, the barrel cover 22 is opened and the sludge mixture is added to the barrel body 21 for culture. In addition, a heating cavity layer 5 is provided on the outside of the reaction barrel 2. By adding high-temperature liquid, such as heating oil, into the heating cavity layer 5, the temperature inside the heating cavity layer 5 is increased to heat the inside of the reaction barrel 2. Therefore, when sludge is cultured, the internal sludge mixture can be heated by the heating layer so that the inside of the reaction barrel 2 is maintained at the required temperature. In addition, as shown in FIG. Figure 1-Figure 3 As shown, a stirring mechanism 6 is further provided inside the reaction barrel 2, so that when the pH value of the sludge mixture needs to be adjusted during the sludge cultivation process, additives are added to the reaction barrel 2, and then stirred by the stirring mechanism 6 so that the sludge mixture and the additives are evenly mixed;

[0030] Specifically, such as Figure 1-Figure 3 As shown, the stirring mechanism 6 includes a drive motor 61, a stirring shaft 62 and a stirring paddle 63, wherein the drive motor 61 is installed above the reaction barrel 2, and the drive motor 61 is connected to the barrel cover 22 of the reaction barrel 2, and the stirring shaft 62 is located inside the reaction barrel 2, and the top end of the stirring shaft 62 is rotatably connected to the barrel body 21 through a bearing. In addition, the stirring shaft 62 is driven to rotate by the drive motor 61, and the outer wall of the stirring shaft 62 is further provided with a stirring paddle 63, and the stirring paddle 63 is provided with at least two groups, and the two groups of stirring paddles 63 are arranged longitudinally on the outer wall of the stirring shaft 62. Therefore, when adding additives to the inside of the reaction barrel 2, the drive motor 61 can be started to rotate the stirring shaft 62, thereby driving the stirring paddle 63 to stir and mix the sludge mixture and the additives inside the reaction barrel 2;

[0031] In actual work, since the volume of the reaction barrel 2 is too large during stirring, the sludge mixture inside is large, and when adding additives, the additives can generally only be added at a certain point inside the reaction barrel 2. Since the sludge mixture is relatively viscous, the mixture is prone to stratification during subsequent stirring and mixing, resulting in uneven mixing. Therefore, in order to achieve a better mixing effect of the additive and the sludge mixture, Figures 1-8As shown, the stirring shaft 62 is configured to include an outer shaft 621, an inner tube 622, a submersible pump 623 and a connecting shaft 624, wherein a central through hole 7 penetrating the upper and lower end surfaces is provided at the center of the outer shaft 621, and a dosing chamber 8 is further provided inside the outer shaft 621, and the dosing chamber 8 is arranged around the central through hole 7, and a dosing hole 9 is opened on the inner wall of the central through hole 7, and the dosing chamber 8 is communicated with the central through hole 7 through the dosing hole 9, and the stirring paddle 63 is fixedly provided on the outer wall of the outer shaft 621, and the inner tube 622 is slidably inserted into the inner wall of the central through hole 7, the top end of the inner tube 622 is in an open state, and the outer wall of the inner tube 622 and the inner wall of the central through hole 7 are slidingly sealed, the top end of the inner tube 622 is located inside the central through hole 7, and the outer wall of the inner tube 622 covers and seals the dosing hole 9, and In order to allow the additives on the inner wall of the dosing chamber 8 to enter the interior of the inner tube 622, a connecting hole 10 is opened on the outer wall of the inner tube 622, and the connecting hole 10 and the dosing hole 9 are at the same horizontal position. When the outer shaft rotates, the connecting hole 10 and the dosing hole 9 will intermittently communicate with each other as the outer shaft rotates. In addition, a submersible pump 623 is installed at the bottom of the reaction barrel 2, and the bottom end of the inner tube 622 is connected to the water outlet of the submersible pump 623, so that the submersible pump 623 can draw the sludge mixture inside the reaction barrel 2 and discharge it through the top opening of the inner tube 622, and the top of the outer shaft 621 is fixedly connected to the connecting shaft 624, and the bottom of the connecting shaft 624 is opened with a water outlet cavity 11 connected to the central through hole 7, and the outer wall of the water outlet cavity 11 is opened with a water outlet hole 12;

[0032] Therefore, additives can be added to the interior of the dosing chamber 8. When the submersible pump 623 is running, the submersible pump 623 can continuously extract the mixed liquid at the bottom of the reaction barrel 2 into the interior of the inner tube 622, and discharge it into the central through hole 7 through the top opening of the inner tube 622, and then enter the water outlet cavity 11 and be discharged through the water outlet hole 12. When the sludge mixed liquid continuously flows through the interior of the inner tube 622, the additives in the dosing chamber 8 will enter the interior of the inner tube 622 through the dosing hole 9 and the connecting hole 10, so that the additives are added along with the flowing sludge mixed liquid, so that the additives are added during the circulating flow of the sludge mixed liquid, so that the additives and the sludge mixed liquid are mixed. The mixing effect of the mud mixture is more uniform, and the addition of additives is more dispersed. In addition, the sludge mixture at the bottom of the reaction barrel 2 can be continuously circulated from the bottom to the top. In this process, the additive will be added to the flowing sludge mixture, thereby avoiding the situation where the addition of additives is separated into upper and lower layers. Therefore, the mixing effect can be improved. By providing the inner tube 622 and connecting the inner tube 622 to the submersible pump 623, when the outer shaft rotates for stirring, the inner tube 622 will not be able to rotate, so that the dosing hole 9 and the connecting hole 10 will be intermittently connected. Therefore, the addition of additives can be intermittent, making the addition of additives more dispersed.

[0033] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 、 Figure 9 and Figure 10 As shown, the connecting shaft 624 is connected to the driving motor 61 through the connecting assembly 13, so that the driving motor 61 can drive the connecting shaft 624 to rotate through the connecting assembly 13, thereby driving the outer shaft 621 to rotate. More specifically, a control groove 14 is provided on the upper end surface of the connecting shaft 624, and the control groove 14 is polygonal. In this embodiment, it is set to a quadrilateral, and the connecting assembly 13 includes a rotating column 131 and a control column 132, wherein the rotating column 131 is rotatably connected to the barrel cover 22 through a bearing, and the two ends of the rotating column 131 extend to the top and bottom of the barrel cover 22 respectively, and the control column 132 is fixedly arranged at the bottom end of the rotating column 131, and the control column 132 is the same as the control groove 14, both of which are quadrilaterals, and the outer wall of the control column 132 is connected to the control column 132. The groove 14 is slidably plugged in, and the outer wall of the rotating column 131 located at one end above the barrel cover 22 is fixedly sleeved with a gear 15, and the output end of the drive motor 61 is fixedly provided with a gear 2 16, and the gear 1 15 is meshed and connected with the gear 2 16, so that the drive motor 61 can drive the rotating column 131 to rotate through the gear 15 and the gear 2 16, and the rotating column 131 drives the control column 132 to rotate, so that during operation, the barrel cover 22 is closed, and the control column 132 is inserted into the interior of the control groove 14, and the control column 132 rotates with the rotating column 131. The control column 132 drives the connecting shaft 624 to rotate by cooperating with the control groove 14, thereby driving the outer shaft 621 to rotate, so that the stirring paddle 63 rotates to stir and mix the sludge mixture and the additive;

[0034] In order to make the addition of additives more convenient, a dosing tube 17 is fixedly provided on the inner wall of the central through hole 7, and one end of the dosing tube 17 is communicated with the interior of the dosing chamber 8, and the other end of the dosing tube 17 extends to the inside of the control groove 14 of the connecting shaft 624 and is fixedly connected to the connecting shaft 624. In addition, a connecting tube 18 is fixedly provided inside the rotating column 131, and one end of the connecting tube 18 extends to the top of the rotating column 131. The end of the connecting tube 18 located above the rotating column 131 can be connected to the pipeline of the external dosing pump through the rotary joint 3, and the connecting tube 18 is fixed to the inner wall of the central through hole 7. The other end of the connecting pipe 18 extends to the bottom of the control column 132, and the end of the connecting pipe 18 below the control column 132 is slidably plugged into one end of the dosing pipe 17. The end of the connecting pipe 18 below the control column 132 is slidably sealed with one end of the dosing pipe 17, so that when adding additives, the end of the connecting pipe 18 above the rotating column 131 is connected to the pipeline of the external dosing pump through the rotary joint 3. When dosing, the dosing pump is started, and the drive motor 61 and the submersible pump 623 are started at the same time. The dosing pump starts The additive enters the dosing chamber 8 through the connecting tube 18 and the dosing tube 17, and is discharged through the dosing hole 9 and the connecting hole 10. At the same time, the driving motor 61 drives the rotating column 131 to rotate through the gear 2 16 and the gear 1 15, and the rotating column 131 drives the control column 132 to rotate, and the control column 132 drives the connecting shaft 624 to rotate, so that the outer shaft rotates, and the rotation of the outer shaft drives the stirring paddle 63 to stir the mixed liquid inside the reaction barrel 2. At the same time, due to the rotation of the outer shaft, the inner tube 622 cannot rotate, so that the dosing hole 9 and the connecting hole 10 are not rotated. It can be intermittently connected so that the additives inside the dosing chamber 8 can be discharged intermittently. In addition, when the submersible pump 623 is running, the sludge mixture at the bottom of the reaction barrel 2 will be continuously drawn into the inner tube 622 and discharged into the water outlet cavity 11 through the central through hole 7, and then discharged through the water outlet hole 12. In this process, the additive will be intermittently added to the flowing sludge mixture, so that the additive can be dispersed and evenly added to the sludge mixture, and then continuously stirred by the stirring paddle 63 to improve the mixing effect.

[0035] The principle of the present invention is as follows: when the present invention is in operation, the barrel cover 22 is first opened, and the sludge mixture is added into the reaction barrel 2, and then the sludge mixture is tested, such as pH testing, etc. When the pH needs to be adjusted, the corresponding additives are added to the sludge mixture, and the dosing pump is started first, and the drive motor 61 and the submersible pump 623 are started at the same time. When the dosing pump is started, the additive enters the dosing chamber 8 through the connecting pipe 18 and the dosing pipe 17, and is discharged through the dosing hole 9 and the connecting hole 10. At the same time, the drive motor 61 drives the rotating column 131 to rotate through the gear 2 16 and the gear 1 15, and the rotating column 131 drives the control column 132 to rotate, and the control column 132 drives the connecting shaft 624 to rotate, so that the outer shaft 621 rotates, and the rotation of the outer shaft 621 drives the stirring paddle 63 to pump the mixed liquid into the reaction barrel 2. The mixing is carried out, and at the same time, due to the rotation of the outer shaft 621, the inner tube 622 cannot rotate, so that the dosing hole 9 and the connecting hole 10 can be intermittently connected, so that the additives inside the dosing chamber 8 can be intermittently discharged. In addition, when the submersible pump 623 is running, the sludge mixture at the bottom of the reaction barrel 2 will be continuously drawn into the inner tube 622 and discharged into the water outlet cavity 11 through the central through hole 7, and then discharged through the water outlet hole 12. In this process, the additive will be intermittently added to the flowing sludge mixture, so that the additive can be dispersed and evenly added to the sludge mixture, and then continuously stirred by the stirring paddle 63 to improve the mixing effect. After the mixing is completed, the sludge mixture is left to settle and aerated through the aeration device 4. When the sludge cultivation is completed, the reaction barrel 2 is turned over and the sludge is discharged.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A device for cultivating activated sludge with a high accumulation rate and short-range nitrification, comprising a fixed frame (1) and a reaction barrel (2) mounted on the fixed frame (1), wherein an aeration device (4) is further provided at the bottom of the reaction barrel (2), characterized in that: A stirring mechanism (6) is further provided inside the reaction barrel (2), and the stirring mechanism (6) includes a driving motor (61), a stirring shaft (62), and a stirring paddle (63). The driving motor (61) is installed above the reaction barrel (2), and the stirring shaft (62) is located inside the reaction barrel (2). The top end of the stirring shaft (62) is rotatably connected to the barrel body (21) via a bearing. The stirring shaft (62) is driven to rotate by the driving motor (61), and a stirring paddle (63) is further provided on the outer wall of the stirring shaft (62); The stirring shaft (62) is configured to include an outer shaft (621), an inner tube (622), a submersible pump (623) and a connecting shaft (624). A central through hole (7) penetrating the upper and lower end surfaces is provided at the center of the outer shaft (621). A dosing cavity (8) is further provided inside the outer shaft (621), and the dosing cavity (8) is provided around the central through hole (7). A dosing hole (9) communicating with the dosing cavity (8) is provided on the inner wall of the central through hole (7). The stirring paddle (63) is fixedly provided on the outer wall of the outer shaft (621). The central through hole ( An inner tube (622) is slidably inserted into the interior of the reaction barrel (7), and the outer wall of the inner tube (622) and the inner wall of the central through hole (7) are in a sliding seal. A submersible pump (623) is installed at the bottom of the interior of the reaction barrel (2), and the bottom end of the inner tube (622) is connected to the water outlet of the submersible pump (623). A connecting shaft (624) is fixedly connected to the top of the outer shaft (621), and a water outlet cavity (11) communicating with the central through hole (7) is provided at the bottom of the interior of the connecting shaft (624), and a water outlet hole (12) is provided on the outer wall of the water outlet cavity (11); The outer wall of the inner tube (622) covers and seals the dosing hole (9). A connecting hole (10) is provided on the outer wall of the inner tube (622), and the connecting hole (10) and the dosing hole (9) are at the same horizontal position.

2. The cultivation device for a high accumulation rate short-range nitrification activated sludge according to claim 1, characterized in that: The reaction barrel (2) consists of a barrel body (21) and a barrel cover (22), wherein the barrel body (21) and the barrel cover (22) are detachably connected via screws, and a heating cavity layer (5) is provided on the outside of the reaction barrel (2).

3. The cultivation device for a high accumulation rate short-range nitrification activated sludge according to claim 2, characterized in that: The connecting shaft (624) is transmission-connected to the driving motor (61) via a connecting assembly (13). A control groove (14) is provided on the upper end surface of the connecting shaft (624), and the control groove (14) is polygonal.

4. The cultivation device for a high accumulation rate short-range nitrification activated sludge according to claim 3, characterized in that: The connecting assembly (13) comprises a rotating column (131) and a control column (132). The rotating column (131) is rotatably connected to the barrel cover (22). The two ends of the rotating column (131) extend to the upper and lower parts of the barrel cover (22) respectively. The control column (132) is fixedly arranged at the bottom end of the rotating column (131). The control column (132) and the control groove (14) are both polygonal in shape. The outer wall of the control column (132) is slidably plugged into the control groove (14).

5. The cultivation device for a high accumulation rate short-range nitrification activated sludge according to claim 4, characterized in that: The outer wall of the rotating column (131) located above the barrel cover (22) is fixedly sleeved with a gear 1 (15), and the output end of the driving motor (61) is fixedly provided with a gear 2 (16), and the gear 1 (15) is meshedly connected with the gear 2 (16).

6. The cultivation device for high accumulation rate short-range nitrification activated sludge according to claim 5, characterized in that: A dosing tube (17) is fixedly provided on the inner wall of the central through hole (7), and one end of the dosing tube (17) is communicated with the interior of the dosing chamber (8), and the other end of the dosing tube (17) extends to the interior of the control groove (14) and is fixedly connected to the connecting shaft (624). A connecting tube (18) is fixedly provided inside the rotating column (131), and one end of the connecting tube (18) extends to the top of the rotating column (131), and the other end of the connecting tube (18) extends to the bottom of the control column (132), and the end of the connecting tube (18) located below the control column (132) is slidably plugged into one end of the dosing tube (17).

7. The cultivation device for high accumulation rate short-range nitrification activated sludge according to claim 6, characterized in that: One end of the connecting tube (18) located below the control column (132) is in sliding sealing engagement with one end of the dosing tube (17).

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