Food factory sludge treatment lifting equipment

By designing the sludge treatment and lifting equipment in the food factory, the sludge is automatically lifted by spiral conveyor sheets and lifting plates, and separating the sludge through the discharge plates, the problem of sludge in the existing equipment needs to be manually cleaned, and effective separation and automated treatment of sewage and sludge are achieved.

CN222821388UActive Publication Date: 2025-05-02WUHAN LVNONG RUIYI BIOTECHNOLOGY CO LTD
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Patent Information

Application Number
CN202420536865.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-19
Publication Date
2025-05-02
Estimated Expiration
2034-03-19

AI Technical Summary

Technical Problem

In the existing food factory sewage treatment equipment, the sludge inside the aeration chamber needs to be manually cleaned, which is time-consuming and labor-intensive, and is not convenient for automatic separation.

Method used

A food factory sludge treatment and lifting equipment is designed, including a treatment device, a screw conveyor sheet, a lifting plate, a discharge plate and a box. The treatment device is divided into a precipitation chamber and an aeration chamber by setting up a symmetrical inclined plate, and the sludge is lifted and separated from the aeration chamber by using a screw conveyor sheet and lifting plate. The sludge is discharged through the discharge plate and the sewage is returned to the left side of the box.

Benefits of technology

The automatic improvement of sludge and the effective separation of sewage and sludge are achieved, the time and labor of manual cleaning are reduced, and the efficiency and convenience of sludge treatment are improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses food factory sludge treatment lifting equipment, which relates to the technical field of food factory sewage treatment equipment, and particularly comprises a treatment device, two symmetrical inclined plates are arranged in the treatment device in the left-right direction, the two symmetrical inclined plates divide the internal space of the treatment device into two treatment chambers, and a settling chamber is arranged on the left side. Through the arrangement of the treatment device, the spiral conveying sheet, the lifting plate, the discharge plate and the box body, during use, sewage in the aeration chamber of the treatment device flows to the left side of the box body through the discharge hole, then the sewage sludge in the aeration chamber is slowly lifted along the lifting plate through the conveying of the spiral conveying sheet, and the sewage sludge is discharged through the through holes formed in the spiral conveying sheet. And the sludge continues to rise along the lifting plate, and when the sludge rises to the joint of the lifting plate and the discharge plate, the sludge slides downwards along the discharge plate and is discharged from the sludge outlet in the right side wall of the box body, so that the purposes of effectively lifting the sludge and separating the sewage are achieved.
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Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment for food factories, in particular to sludge treatment and lifting equipment for food factories. Background Art

[0002] Food processing plants generate a large amount of wastewater during the production process. The wastewater generated by food processing plants also contains a large amount of organic matter. If it is discharged into external water bodies, it will cause serious pollution to water resources.

[0003] The wastewater treatment process of food processing plants is generally divided into three steps: first, screen filtration, which simply filters out large particles of foreign matter through the screen mesh; second, sedimentation, the filtered wastewater flows into the sedimentation chamber for sedimentation; third, the precipitated wastewater enters the aeration chamber, and through activated sludge decomposition, the organic matter in the wastewater is degraded into inorganic matter, and then discharged.

[0004] After the sewage is decomposed in the aeration chamber, there is a lot of sludge inside. The existing equipment needs to be cleaned manually, which is troublesome, time-consuming and labor-intensive. Utility Model Content

[0005] The present invention aims at the shortcomings and defects of the prior art in that the sludge inside the aeration chamber is inconvenient to discharge.

[0006] The utility model discloses a food factory sludge treatment lifting equipment, comprising a treatment device, wherein two symmetrical inclined plates are arranged in the left and right directions inside the treatment device, and the two symmetrical inclined plates divide the internal space of the treatment device into two treatment chambers, the left one is a sedimentation chamber, and the right one is an aeration chamber, the left inclined plate comprises an upper plate and a lower plate, an overflow port is spaced between the upper plate and the lower plate, the right inclined plate is an inclined plate with a discharge hole, and a lifting device is arranged on the right side of the inclined plate, and the lifting device is used to lift the sludge in the sludge water flowing out of the discharge hole and separate the sewage and the sludge.

[0007] Furthermore, the lifting device includes a box body, a lifting plate is arranged inside the box body, a discharge plate is arranged at the right end of the lifting plate, both side walls of the lifting plate and the discharge plate are fixed to the inner wall of the box body, a sludge outlet is opened at the position of the right side wall of the box body corresponding to the discharge plate, and a spiral conveying plate is arranged above the lifting plate.

[0008] Furthermore, a support plate is provided on the left side of the upper end surface of the lifting plate, the top end of the support plate is fixed to the right side surface of the inclined plate, the left end of the central axis of the spiral conveying plate is rotatably connected to the support plate through a bearing and passes through the support plate, and the right end of the central axis of the spiral conveying plate is rotatably connected to the right side wall of the box body through a bearing.

[0009] Furthermore, a motor is fixed to the left side of the support plate, and an output shaft of the motor is fixed to the left end of the central axis of the spiral conveying sheet.

[0010] Furthermore, a plurality of through holes are radially provided at the contact point between the spiral conveying piece and the central shaft, and the through holes are evenly arranged along the axis of the central shaft.

[0011] Furthermore, two spiral conveying plates are provided, the right end of the central axis of the spiral conveying plate passes through the right side wall of the box and is provided with a synchronous wheel, the two synchronous wheels are connected by belt drive, and a transmission belt cover is provided on the outside of the synchronous wheel, and the transmission belt cover is fixed to the right side wall of the box.

[0012] Furthermore, a sliding cavity is opened inside the inclined plate, and a baffle is arranged inside the sliding cavity so that the inclined plate can slide up and down. A driving pin is arranged on the right side of the baffle. A vertical sliding groove and a horizontal sliding groove connected to the sliding cavity are opened at a position on the right side of the inclined plate corresponding to the driving pin. The top of the vertical sliding groove is perpendicular to and connected to the left side of the horizontal sliding groove. When the baffle slides downward to the lower limit position, the baffle closes the discharge hole. When the baffle slides upward to the upper limit position, the baffle opens the discharge hole.

[0013] Furthermore, a plurality of springs are evenly arranged on the top surface of the baffle, and the top end of each spring is fixed to the inner top wall of the sliding cavity of the inclined plate.

[0014] Furthermore, an air pipe is arranged at the intersection of the lower plate and the bottom end of the inclined plate, and air holes are evenly opened on the outer surface of the air pipe. An air nozzle is threadedly connected to the outer side of the processing device, and the air nozzle is connected to the inside of the air pipe. The outer side of the air nozzle is connected to the air injection device through a pipeline.

[0015] Furthermore, a sewage sludge inlet pipe is arranged on the upper end surface of the treatment device above the sedimentation chamber, and a grid plate is slidably connected to the upper edge of the internal overflow port of the sedimentation chamber in the front-to-back direction.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] 1. The utility model is provided with a treatment device, a spiral conveying sheet, a lifting plate, a discharge plate, and a box body. When the device is used, the sewage in the aeration chamber of the treatment device flows into the left side of the box body through the discharge hole, and then is transported by the spiral conveying sheet. The sewage sludge inside is slowly lifted along the lifting plate, and the sewage is more convenient to flow back through the through holes provided on the spiral conveying sheet. The sludge continues to rise along the lifting plate. When the sludge rises to the junction of the lifting plate and the discharge plate, the sludge slides down along the discharge plate and is discharged from the sludge outlet on the right side wall of the box body, thereby achieving the purpose of effectively lifting the sludge and separating the sewage.

[0018] 2. The utility model is provided with an inclined plate, a baffle, a driving pin and a spring. When the device is in use, when it is not necessary to discharge the sludge, the spring pushes the baffle to slide downward so that the baffle seals the discharge hole of the inclined plate. When it is necessary to discharge the sludge, the baffle is lifted upward by the driving pin so that the baffle opens the discharge hole. When the driving pin moves to the top of the vertical slide groove, the driving pin is slid to the right so that the driving pin enters the interior of the horizontal slide groove, so that the baffle is kept in the upper limit position, and then the sludge in the sewage flowing out of the discharge hole is lifted and separated by the lifting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the front view structure of the utility model;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the processing device and the interior of the box of the utility model;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the trachea of ​​the utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the processing device and the box of the utility model;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the inclined plate of the utility model;

[0026] Figure 7 It is a schematic diagram of the internal three-dimensional structure of the inclined plate of the utility model.

[0027] In the figure: 1. treatment device; 2. box body; 3. inlet pipe; 4. inclined plate; 5. grille plate; 6. sludge outlet; 7. transmission belt cover; 8. driving pin; 9. vertical slide; 10. air nozzle; 11. upper plate; 12. lower plate; 13. synchronous wheel; 14. belt; 15. support plate; 16. lifting plate; 17. discharge plate; 18. spiral conveyor plate; 19. air pipe; 20. through hole; 21. discharge hole; 22. baffle; 23. motor; 24. horizontal slide; 25. center axis; 26. spring. DETAILED DESCRIPTION

[0028] The following will disclose multiple embodiments of the utility model with diagrams. For the purpose of clear description, many physical details will be described together in the following description. However, it should be understood that these physical details should not be used to limit the utility model. In other words, in some embodiments of the utility model, these physical details are not necessary. In addition, for the purpose of simplifying the diagram, some conventional structures and components will be depicted in a simple schematic manner in the diagram.

[0029] See also Figure 1-7 The utility model of the food factory sludge treatment and lifting equipment comprises a treatment device 1, wherein two symmetrical inclined plates are arranged in the left and right directions inside the treatment device 1, and the two symmetrical inclined plates divide the internal space of the treatment device 1 into two treatment chambers, the left one is a sedimentation chamber, and the right one is an aeration chamber. The left inclined plate comprises an upper plate 11 and a lower plate 12, and an overflow port is arranged between the upper plate 11 and the lower plate 12. The right inclined plate is an inclined plate 4 with a discharge hole 21, and a lifting device is arranged on the right side of the inclined plate 4. The lifting device is used to lift the sludge in the sludge water flowing out of the discharge hole 21, and separate the sewage and the sludge. When in use, the sewage sludge of the food factory is discharged into the sedimentation chamber for sedimentation, and the sewage in the sedimentation chamber passes through the sedimentation passage The sewage flows into the aeration chamber between the two inclined plates through the overflow port between the upper plate 11 and the lower plate 12. Activated sludge is put into the aeration chamber. Aerobic bacteria are contained in the activated sludge. The organic matter in the sewage is decomposed into inorganic matter by the aerobic bacteria, and the sewage is effectively degraded. When the sewage in the aeration chamber needs to be discharged, the discharge hole 21 is opened to allow the sewage in the aeration chamber to flow into the lifting device through the discharge hole 21, and then the sludge in the sewage is lifted and discharged by the lifting device, while the sewage is retained at the lower end of the lifting device. Then, the sewage retained in the lifting device is pumped out by the pumping equipment, so as to achieve the purpose of effectively separating the sludge from the sewage while lifting the sludge.

[0030] See also Figure 1 , 2, 3, 4, 5, the lifting device includes a box body 2, a lifting plate 16 is arranged inside the box body 2, a discharge plate 17 is arranged at the right end of the lifting plate 16, both side walls of the lifting plate 16 and the discharge plate 17 are fixed to the inner side wall of the box body 2, a sludge outlet 6 is opened at the right side wall of the box body 2 corresponding to the discharge plate 17, a spiral conveying piece 18 is arranged above the lifting plate 16, when the sewage in the aeration chamber flows into the box body 2 through the discharge hole 21, the spiral conveying piece 18 rotates, so that the sewage and sludge on the left side of the lifting plate 16 are slowly discharged together When the sewage is lifted along the lifting plate 16 to a certain height, it will flow back from the gap between the spiral conveying plate 18 and the side wall of the box body 2, and the sludge will continue to be lifted and move upward along the lifting plate 16. When the sludge moves to the junction of the lifting plate 16 and the discharge plate 17, the sludge enters the upper end surface of the discharge plate 17, slides down along the upper end surface of the discharge plate 17, and is discharged from the sludge outlet 6, while the sewage is retained on the left side of the lifting plate 16. The sewage can then be pumped out by a pumping equipment, thereby achieving the purpose of separating the sludge from the sewage while lifting the sludge.

[0031] In order to achieve the purpose of driving the spiral conveying piece 18, in this embodiment, please refer to Figure 3 , 5 A support plate 15 is provided on the left side of the upper end surface of the lifting plate 16, and the top end of the support plate 15 is fixed to the right side surface of the inclined plate 4. The left end of the central axis 25 of the spiral conveying plate 18 is rotatably connected to the support plate 15 through a bearing and penetrates the support plate 15. The right end of the central axis 25 of the spiral conveying plate 18 is rotatably connected to the right side wall of the box body 2 through a bearing. The rotation of the central axis 25 drives the spiral conveying plate 18 to rotate. The front and rear sides of the support plate 15 are fixed to the side walls of the box body 2, so as to achieve the purpose of completely isolating the space formed by the left side of the support plate 15 and the inclined plate 4 from the space where the spiral conveying plate 18 is located.

[0032] See also Figure 5 A motor 23 is fixed to the left side of the support plate 15, and the output shaft of the motor 23 is fixed to the left end of the central axis 25 of the spiral conveying sheet 18. The motor 23 is located in the space on the left side of the support plate 15 to prevent the motor 23 from being soaked by sewage.

[0033] In order to improve the sewage return effect when the spiral conveying piece 18 lifts the sludge, in this embodiment, please refer to Figure 3 , 4 5. A plurality of through holes 20 are radially opened at the contact point between the spiral conveying piece 18 and the central axis 25. The through holes 20 are evenly arranged along the axis of the central axis 25. When the spiral conveying piece 18 rotates to lift the sludge, the sewage is lifted to a certain height and can flow back through the through holes 20, so that the separation effect of sewage and sludge is better.

[0034] In order to improve the efficiency of the spiral conveying piece 18 in lifting the sludge, in this embodiment, please refer to Figure 3 , 4 There are two spiral conveying pieces 18. The right end of the central axis 25 of the spiral conveying piece 18 passes through the right side wall of the box body 2 and is provided with a synchronous wheel 13. The two synchronous wheels 13 are connected through a belt 14. A transmission belt cover 7 is provided on the outside of the synchronous wheel 13. The transmission belt cover 7 is fixed to the right side wall of the box body 2. The motor 23 drives one of the spiral conveying pieces 18 to rotate through the central axis 25, and drives one of the synchronous wheels 13 to rotate at the same time. The synchronous wheel 13 drives the other synchronous wheel 13 to rotate through the belt 14, and then drives the other spiral conveying piece 18 to rotate, so that the two spiral conveying pieces 18 rotate synchronously, thereby improving the sludge lifting efficiency.

[0035] In order to make the opening and closing of the discharge hole 21 controllable, in this embodiment, please refer to Figure 1 , 2 , 3, 4, 5, 7, a sliding cavity is provided inside the inclined plate 4, and a baffle 22 is provided on the inclined plate 4 to slide up and down inside the sliding cavity. A driving pin 8 is provided on the right side of the baffle 22, and a vertical slide groove 9 and a horizontal slide groove 24 connected to the sliding cavity are provided at a position corresponding to the driving pin 8 on the right side of the inclined plate 4. The top of the vertical slide groove 9 is perpendicular to and connected to the left side of the horizontal slide groove 24. When the baffle 22 slides downward to the lower limit position, the baffle 22 closes the discharge hole 21. At this time, the sewage inside the aeration chamber is decomposed into activated sludge. When the sewage inside the aeration chamber needs to be discharged, the baffle 22 is slid upward to the upper limit position, and the baffle 22 opens the discharge hole 21. At this time, the sewage inside the aeration chamber is discharged into the left side of the box body 2 through the discharge hole 21, and then the sludge therein is lifted by the spiral conveying sheet 18, and the sludge is discharged for centralized treatment, while the sewage therein is retained on the left side of the box body 2, and then the retained sewage inside the box body 2 is discharged through the pumping equipment.

[0036] In order to prevent the baffle 22 from being easily moved by external force when it is located at the lower limit position, in this embodiment, please refer to Figure 6 , 7 A plurality of springs 26 are evenly arranged on the top surface of the baffle 22, and the top end of each spring 26 is fixed to the inner top wall of the sliding cavity of the inclined plate 4. When the baffle 22 is at the lower limit position to seal the discharge hole 21, the spring 26 always generates a thrust on the baffle 22, so that the baffle 22 is at the lower limit position and is not easily moved.

[0037] When sewage enters the aeration chamber, the organic matter inside the sewage is decomposed by activated sludge. Since the bacteria inside the activated sludge are aerobic bacteria, air needs to be continuously introduced into the sewage inside the aeration chamber. The air introduced into the aeration chamber has another function. When the sewage inside the aeration chamber needs to be discharged, the discharge hole 21 is opened. At this time, the air introduced from the bottom of the aeration chamber can stir up the sludge and sewage, making it easier for the sludge in the sewage to be discharged from the discharge hole 21.

[0038] In this embodiment, please refer to Figure 1 , 2 , 3, 4, 5, 7, an air pipe 19 is arranged at the intersection of the lower plate 12 and the bottom end of the inclined plate 4, and air holes are evenly opened on the outer surface of the air pipe 19. An air nozzle 10 is threadedly connected to the outside of the treatment device 1, and the air nozzle 10 is communicated with the inside of the air pipe 19. The outside of the air nozzle 10 is communicated with the air injection device through a pipeline, and the air injection device injects air into the air nozzle 10 through the pipeline. The air enters the air pipe 19 through the air nozzle 10 and is discharged from the air holes of the air pipe 19. The air discharged from the air holes stirs up the sewage and sludge at the bottom of the aeration chamber, provides oxygen for aerobic bacteria, and can make the sewage sludge in a tumbling state, which is convenient for aerobic bacteria to degrade organic matter in the sewage. At the same time, when it is necessary to discharge the sewage inside the aeration chamber, the introduced air facilitates the sludge at the bottom of the aeration chamber to be discharged from the discharge hole 21.

[0039] See also Figure 1 , 2 , 3, 4, 5. The upper end surface of the treatment device 1 located above the sedimentation chamber is provided with a sewage sludge inlet pipe 3, and the upper edge of the internal overflow port of the sedimentation chamber is slidably connected with a grid plate 5 in the front-to-rear direction. When in use, the sewage sludge of the food factory is discharged into the sedimentation chamber through the inlet pipe 3 and is initially filtered through the grid plate 5, so that large particles of foreign matter are separated and processed, and then the sewage enters the sedimentation chamber for sedimentation.

[0040] When using the utility model: When in use, the sewage sludge of the food factory is discharged into the sedimentation chamber through the inlet pipe 3 and is initially filtered through the grid plate 5, so that large particles of foreign matter are separated and processed, and then the sewage enters the sedimentation chamber for sedimentation. The sewage in the sedimentation chamber flows into the aeration chamber between the two inclined plates through the overflow port between the upper plate 11 and the lower plate 12 after sedimentation. The sewage inside the aeration chamber is decomposed by the activated sludge, and then the baffle 22 is moved upward to open the discharge hole 21, so that the sewage inside the aeration chamber flows into the interior of the box 2, and then the sludge in the sewage is lifted and discharged through the lifting of the spiral conveying sheet 18, and the sewage retained on the left side of the box 2 can be pumped out by the pumping equipment.

[0041] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A food factory sludge treatment and lifting equipment, comprising a treatment device (1), characterized in that: Two symmetrical inclined plates are arranged in the left and right directions inside the treatment device (1), and the two symmetrical inclined plates divide the internal space of the treatment device (1) into two treatment chambers, the left one being a sedimentation chamber and the right one being an aeration chamber. The left inclined plate comprises an upper plate (11) and a lower plate (12), and an overflow port is provided between the upper plate (11) and the lower plate (12). The right inclined plate is an inclined plate (4) with a discharge hole (21). A lifting device is arranged on the right side of the inclined plate (4), and the lifting device is used to lift the sludge in the sludge water flowing out of the discharge hole (21) and separate the sewage and the sludge.

2. A food factory sludge treatment and lifting equipment according to claim 1, characterized in that: The lifting device comprises a box body (2), a lifting plate (16) is arranged inside the box body (2), a discharge plate (17) is arranged at the right end of the lifting plate (16), both side walls of the lifting plate (16) and the discharge plate (17) are fixed to the inner side wall of the box body (2), a sludge outlet (6) is provided at a position corresponding to the discharge plate (17) on the right side wall of the box body (2), and a spiral conveying plate (18) is arranged above the lifting plate (16).

3. A food factory sludge treatment and lifting equipment according to claim 2, characterized in that: A support plate (15) is provided on the left side of the upper end surface of the lifting plate (16), the top end of the support plate (15) is fixed to the right side surface of the inclined plate (4), the left end of the central axis (25) of the spiral conveying plate (18) is rotatably connected to the support plate (15) through a bearing and passes through the support plate (15), and the right end of the central axis (25) of the spiral conveying plate (18) is rotatably connected to the right side wall of the box body (2) through a bearing.

4. A food factory sludge treatment and lifting equipment according to claim 3, characterized in that: A motor (23) is fixed to the left side of the support plate (15), and an output shaft of the motor (23) is fixed to the left end of the central axis (25) of the spiral conveying piece (18).

5. The food factory sludge treatment and lifting equipment according to claim 3 is characterized by: A plurality of through holes (20) are radially provided at the contact point between the spiral conveying piece (18) and the central shaft (25), and the through holes (20) are evenly arranged along the axis of the central shaft (25).

6. A food factory sludge treatment and lifting equipment according to claim 4 or 5, characterized in that: Two spiral conveying pieces (18) are provided. The right end of the central axis (25) of the spiral conveying piece (18) penetrates the right side wall of the box body (2) and is provided with a synchronous wheel (13). The two synchronous wheels (13) are connected by a belt (14). A transmission belt cover (7) is provided outside the synchronous wheel (13), and the transmission belt cover (7) is fixed to the right side wall of the box body (2).

7. A food factory sludge treatment and lifting equipment according to claim 6, characterized in that: A sliding cavity is provided inside the inclined plate (4), and a baffle (22) is provided on the inclined plate (4) so ​​as to slide up and down inside the sliding cavity. A driving pin (8) is provided on the right side of the baffle (22). A vertical sliding groove (9) and a horizontal sliding groove (24) which are connected to the sliding cavity are provided at a position corresponding to the driving pin (8) on the right side of the inclined plate (4). The top of the vertical sliding groove (9) is perpendicular to and connected to the left side of the horizontal sliding groove (24). When the baffle (22) slides downward to the lower limit position, the baffle (22) closes the discharge hole (21). When the baffle (22) slides upward to the upper limit position, the baffle (22) opens the discharge hole (21).

8. A food factory sludge treatment and lifting equipment according to claim 7, characterized in that: A plurality of springs (26) are evenly arranged on the top surface of the baffle plate (22), and the top end of each spring (26) is fixed to the inner top wall of the sliding cavity of the inclined plate (4).

9. A food factory sludge treatment and lifting equipment according to claim 8, characterized in that: An air pipe (19) is provided at the intersection of the bottom ends of the lower plate (12) and the inclined plate (4), and air holes are evenly opened on the outer surface of the air pipe (19). An air nozzle (10) is threadedly connected to the outer side of the processing device (1), and the air nozzle (10) is connected to the inside of the air pipe (19), and the outer side of the air nozzle (10) is connected to the air injection device through a pipeline.

10. A food factory sludge treatment and lifting equipment according to claim 9, characterized in that: A sewage sludge inlet pipe (3) is arranged on the upper end surface of the treatment device (1) above the sedimentation chamber, and a grid plate (5) is slidably connected to the upper edge of the internal overflow port of the sedimentation chamber in the front-to-back direction.