Internal circulation anaerobic ammonia oxidation reactor and process for protein wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and particularly discloses an internal circulation anaerobic ammonia oxidation reactor for protein wastewater, which comprises an air flotation machine, a bracket, a positive and negative screw rod, a sliding block and a first connecting rod, and the bottom ends of the left and right sides of the bracket are respectively arranged in the middle parts of the left and right sides of the air flotation machine; the left end and the right end of the forward and reverse screw rod are rotatably arranged at the tops of the left side and the right side of an inner cavity of the support through bearings correspondingly, the left end of the forward and reverse screw rod rotatably extends out of the left side of the support, and the two sliding blocks are in threaded connection to the left side and the right side of the outer wall of the forward and reverse screw rod correspondingly. The top end of the first connecting rod is rotationally arranged on the outer wall of the sliding block through a pin shaft. By regularly detecting the thickness of the scum layer and dynamically adjusting the dissolved air bubble parameters, the problems that the treatment efficiency is unstable, the effluent quality is easily affected and the like due to the fact that the scum layer is too thin or too thick are effectively solved, and meanwhile, the adaptability and the operation efficiency of the device are further improved through integration of an automatic control system.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an internal circulation anaerobic ammonia oxidation reactor and process for protein wastewater. Background Technology

[0002] High-concentration protein wastewater generated in food processing, biopharmaceuticals, and other fields is rich in pollutants such as protein and ammonia nitrogen. Its water quality fluctuates greatly and is difficult to treat, requiring strict treatment before discharge. Air flotation technology, with its advantages of high separation efficiency and small footprint, has become a common method for treating this type of wastewater. Its core principle is to release microbubbles into the wastewater, causing the bubbles to adhere to flocs and float to the surface, forming scum, thereby achieving solid-liquid separation.

[0003] However, existing air flotation machines have significant technical shortcomings when treating protein wastewater: The lack of precision in detecting the thickness of the scum layer, relying on manual observation or indirect judgment, makes it impossible to accurately distinguish the boundary between the liquid surface and the scum layer. This results in insufficient treatment when the scum is too thin and easy caking and backflow when it is too thick, which seriously affects the quality of the effluent. With fixed dissolved air bubble parameters, the dissolved air mechanism cannot dynamically adjust the bubble volume and density according to the state of the scum layer, making it difficult to adapt to the needs of different processing stages and reducing separation efficiency. The low level of automation requires manual preset of operating parameters and cannot adapt to changes in water quality and scum, which not only increases labor costs but also leads to large fluctuations in treatment efficiency and high energy consumption.

[0004] Existing improvement schemes still suffer from insufficient detection accuracy and sluggish adjustment response, failing to fundamentally resolve the core contradiction between scum detection and bubble parameter matching. Therefore, developing an air flotation reactor capable of accurately detecting scum layer thickness and dynamically adjusting bubble parameters is of great significance for improving the stability of protein wastewater treatment and reducing operating costs. Summary of the Invention

[0005] The purpose of this invention is to provide an internal circulation anaerobic ammonia oxidation reactor and process for protein wastewater, so as to at least solve the problems in the prior art where the flotation machine cannot detect the thickness of the scum layer and cannot adjust the volume and density of dissolved air bubbles according to the thickness of the scum layer, resulting in unstable treatment efficiency and easy impact on the quality of effluent.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an internal circulation anaerobic ammonia oxidation reactor for protein wastewater, comprising: an air flotation unit, a support frame, positive and negative lead screws, sliders, a first connecting rod, a detection mechanism, a dissolved air mechanism, and a drive assembly. The bottom ends of the left and right sides of the support frame are respectively located at the middle of the left and right sides of the air flotation unit. The left and right ends of the positive and negative lead screws are respectively rotatably mounted on the top of the left and right sides of the inner cavity of the support frame via bearings. The left end of the positive and negative lead screws rotatably extends out of the left side of the support frame. There are two sliders, which are respectively screwed to the left and right sides of the outer wall of the positive and negative lead screws. The top end of the first connecting rod is rotatably mounted on the outer wall of the slider via a pin. The detection mechanism is rotatably mounted on the bottom end of the first connecting rod via a pin. The dissolved air mechanism is located on the front side of the inner cavity of the air flotation unit. The drive assembly is located on the top end of the support frame, and the drive assembly can drive the positive and negative lead screws to rotate.

[0007] Preferably, the dissolved air mechanism includes: a conveying pipe, a dissolved air tube, micro-pores, and a rotating assembly. The right end of the conveying pipe is located at the front right side of the inner cavity of the air flotation machine, and the left end of the conveying pipe extends out of the left side of the air flotation machine. The dissolved air tube is rotatably sleeved on the outer wall of the conveying pipe via a bearing. The left end of the dissolved air tube extends rotatably out of the left side of the air flotation machine. The outer walls of both the conveying pipe and the dissolved air tube are provided with a plurality of micro-pores communicating with their inner cavities. The rotating assembly is located at the front left side of the air flotation machine and can drive the dissolved air tube to rotate.

[0008] Preferably, the detection mechanism includes: a probe, a moving groove, a conical counterweight head, a magnetostrictive displacement sensor, a magnetic ring, a sleeve, and a buoyancy positioning assembly. The top left and right sides of the probe are rotatably mounted on the bottom ends of two first connecting rods via pins. The outer wall of the probe has several moving grooves equidistantly spaced from top to bottom along the circumference, communicating with its inner cavity. The conical counterweight head is located at the bottom end of the probe. The magnetostrictive displacement sensor is located at the top end of the inner cavity of the probe and at the bottom end of the inner cavity of the probe. The magnetic ring is slidably sleeved on the magnetostrictive displacement sensor, and the magnetic ring and the magnetostrictive displacement sensor are matched. The sleeve is sleeved on the outer wall of the magnetic ring, and the outer wall of the sleeve slidably penetrates the inner cavity of the moving groove and is slidably sleeved on the outer wall of the probe. The buoyancy positioning assembly is located on the outer wall of the sleeve.

[0009] Preferably, the buoyancy positioning assembly includes: a support ring float, positioning grooves, an outer support head, a waterproof cloth, and an outer support assembly. The support ring float is disposed at the bottom of the outer wall of the sleeve. The outer wall of the support ring float has a plurality of positioning grooves equidistantly spaced along the circumference. The outer support head is slidably fitted into the inner cavity of the positioning groove, and the outer end of the outer support head slidably extends out of the inner cavity of the positioning groove. One end of the waterproof cloth is disposed at the outer end of the outer support head, and the other end of the waterproof cloth is disposed on the outer wall of the support ring float. The outer support assembly is disposed at the top of the outer wall of the sleeve.

[0010] Preferably, the external support assembly includes: a collar, a second connecting rod, a spring, and a traction assembly. The collar is slidably sleeved on the top of the outer wall of the sleeve. There are several second connecting rods, with the top ends of the second connecting rods rotatably disposed on the outer wall of the collar at equal intervals along the circumference via pins. The bottom ends of the second connecting rods are rotatably disposed on the top ends of several external support heads via pins. The spring is sleeved on the outer wall of the sleeve, with the top end of the spring engaging the bottom end of the collar and the bottom end of the spring engaging the top end of the support ring float. The traction assembly is disposed in the inner cavity of the conical counterweight head.

[0011] Preferably, the traction assembly includes: a third motor, a third connecting rod, a reel, and pull ropes. The third motor is screwed into the inner cavity of the conical counterweight head. One end of the third connecting rod is locked to the output end of the third motor via a coupling. The other end of the third connecting rod is rotatably mounted on the inner wall of the conical counterweight head via a bearing. The reel is sleeved on the outer wall of the third connecting rod. There are two pull ropes, which are respectively wound around the left and right sides of the outer wall of the reel. The top ends of both pull ropes can slide into the inner cavity of the probe rod. The top ends of the two pull ropes are respectively located on the left and right sides of the bottom end of the sleeve.

[0012] Preferably, the detection mechanism further includes: a first electromagnet and a second electromagnet, wherein the first electromagnet is disposed at the top of the support ring float, and the second electromagnet is disposed at the bottom of the collar, and the first electromagnet and the second electromagnet are magnetically attracted to each other.

[0013] An internal circulation anaerobic ammonia oxidation process for protein wastewater includes the following steps: S1. The pretreated protein wastewater is fed into the air flotation machine, and flocculants and coagulants are added. The flocculation reaction is completed in the air flotation contact zone to form suspended flocs. S2. Gas is introduced into the gas dissolving mechanism through the gas delivery pump. The gas flows into the gas dissolving pipe through the micro-pores of the delivery pipe and is finally released by the micro-pores of the gas dissolving pipe, which fully contact and adhere to the suspended flocs. S3. The flocs with attached microbubbles float to the liquid surface to form a scum layer; the drive component is activated at regular intervals to move the probe of the detection mechanism downwards, and the support ring float and waterproof cloth cooperate to position the scum layer. The thickness of the scum layer is detected by the magnetostrictive displacement sensor and the magnetic ring. S4. Based on the detected thickness, the rotation speed of the dissolved air tube is adjusted by the second motor (accelerating when the scum is thin, reducing the bubble volume and increasing the bubble density; slowing down when the scum is thick, increasing the bubble volume and decreasing the bubble density), and the scraping speed of the air flotation machine scraper is adjusted simultaneously. The scum is scraped off and separated by the scraper, and the treated wastewater meets the discharge standards.

[0014] The internal circulation anaerobic ammonia oxidation reactor for protein wastewater proposed in this invention has the following advantages: 1. This invention uses a dissolved gas delivery pump to deliver gas to a delivery pipe. The gas flows through the inner cavity of the delivery pipe to the dissolved gas pipe and is evenly released into the wastewater through the micropores on the outer wall of the dissolved gas pipe. This provides a stable and uniform source of microbubbles for the wastewater, ensuring that the bubbles can fully contact and adhere to the flocs to form scum with a specific gravity less than water, laying the foundation for subsequent solid-liquid separation. 2. This invention uses a magnetostrictive displacement sensor to accurately measure the position change of the magnetic ring, thereby determining the position of the sleeve and the support ring float. This allows the invention to reflect the position of the top and bottom of the scum layer above the liquid surface of the flotation machine. By comparing the two detected positions, the thickness of the scum layer can be reflected, thus providing operators with accurate information on the state of the scum layer. This avoids problems such as reduced treatment efficiency due to an excessively thin scum layer or scum caking and deterioration of effluent quality due to an excessively thick scum layer. 3. Based on the detection results of the scum layer thickness, this invention adjusts the volume and density of bubbles by rotating the dissolved air tube. When the scum layer is too thin, the dissolved air tube rotates faster, and the bubbles are broken into smaller sizes by shearing. At the same time, centrifugal force accelerates gas release, reduces bubble merging, thereby increasing bubble density and improving the attachment efficiency of suspended matter. When the scum layer is too thick, the rotation speed of the dissolved air tube decreases, the bubble volume increases, and the density decreases, accelerating the rise and separation of scum and preventing excessive accumulation of scum. This allows for precise adjustment of bubble parameters, ensuring that the air flotation machine maintains the best treatment effect under different operating conditions. 4. This device effectively solves the problems of unstable treatment efficiency and easily affected effluent quality caused by excessively thin or thick scum layers by periodically detecting the thickness of the scum layer and dynamically adjusting the dissolved air bubble parameters. At the same time, the integration of the automated control system further improves the adaptability and operating efficiency of the device, providing strong support for the optimized application of air flotation technology. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the dissolved gas mechanism; Figure 4 This is an exploded view of the dissolved gas mechanism; Figure 5 This is a schematic diagram of the support structure; Figure 6 This is a schematic diagram of the testing organization's structure; Figure 7 This is a front sectional view of the testing facility; Figure 8 Exploded view of the testing agency; Figure 9 for Figure 7 Enlarged view of point A; Figure 10 for Figure 8 Enlarged view of point B; Figure 11 for Figure 8 Enlarged view of point C; Figure 12 for Figure 6 Enlarged view of point D.

[0016] In the diagram: 1. Air flotation machine; 2. Support frame; 3. Positive and negative lead screws; 4. Slider; 5. First connecting rod; 6. Detection mechanism; 61. Probe; 62. Moving groove; 63. Conical counterweight head; 64. Magnetostrictive displacement sensor; 65. Magnetic ring; 66. Sleeve; 67. Support ring float; 68. Positioning groove; 69. Outer support head; 610. Waterproof cloth; 611. First electromagnet; 612. Collar; 613. Second connecting rod; 614. Second electromagnet; 615. Spring; 616. Third motor; 617. Third connecting rod; 618. Reel; 619. Pull rope; 7. Gas dissolving mechanism; 71. Conveying pipe; 72. Gas dissolving pipe; 73. Second connecting rod; 74. Second pulley; 75. Second belt; 76. Second motor; 77. Micro-pore; 8. First motor; 9. First connecting rod; 10. First pulley; 11. First belt. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-12This invention provides a technical solution for an internal circulation anaerobic ammonia oxidation reactor for protein wastewater, comprising: a flotation unit 1, a support 2, positive and negative lead screws 3, sliders 4, a first connecting rod 5, a detection mechanism 6, a dissolved air mechanism 7, and a drive assembly. The flotation unit 1 is existing technology and serves as the core processing unit of the entire device, providing a place for mixing wastewater and flocculant, flocculation reaction, and flotation separation, achieving the key function of solid-liquid separation. The bottom ends of the left and right sides of the support 2 are respectively located in the middle of the left and right sides of the flotation unit 1. The support 2 can provide a stable support structure for the positive and negative lead screws 3, drive assembly, etc., ensuring the rigidity and smooth operation of the overall mechanical system. The left and right ends of the positive and negative lead screws 3 are rotatably set on the top of the left and right sides of the inner cavity of the support 2 through bearings. The left end of the positive and negative lead screws 3 rotatably extends out of the left side of the support 2. The rotation of the positive and negative lead screws 3 drives the sliders 4 on both sides to move synchronously in opposite directions. The vertical lifting and lowering adjustment of the detection mechanism is achieved by using two sliders 4, which are screwed to the left and right sides of the outer wall of the positive and negative lead screws 3 respectively. The sliders 4 are used to drive the first connecting rod and the detection mechanism to complete the lifting and lowering action. The top of the first connecting rod 5 is rotatably set on the outer wall of the slider 4 through a pin. The first connecting rod 5 serves as a transmission component, converting the linear motion of the slider into the up and down motion of the detection mechanism 6. The detection mechanism 6 is rotatably set on the bottom of the first connecting rod 5 through a pin. The core function of the detection mechanism 6 is to monitor the state of the scum on the liquid surface at regular intervals and feed the data back to the control system. The dissolved air mechanism 7 is set on the front side of the inner cavity of the air flotation machine 1. The dissolved air mechanism 7 releases microbubbles of controllable size into the wastewater through micro-pores 77 to provide an attachment carrier for the flocs and achieve efficient air flotation separation. The drive component is set on the top of the support 2 and can drive the positive and negative lead screws 3 to rotate. The drive assembly includes: a first motor 8, a first connecting rod 9, a first pulley 10, and a first belt 11. The first motor 8 is screwed to the top left side of the bracket 2. The first motor 8 serves as a drive source to provide stable rotational power. The first connecting rod 9 is locked to the output end of the first motor 8 by a coupling. There are two first pulleys 10. The two first pulleys 10 are respectively sleeved on the left side of the outer wall of the first connecting rod 9 and the positive and negative lead screw 3, and locked by a set screw. The two ends of the first belt 11 are respectively sleeved on the outer wall of the two first pulleys 10.

[0019] As a preferred embodiment, the dissolved gas mechanism 7 further includes: a delivery pipe 71, a dissolved gas pipe 72, micro-pores 77, and a rotating assembly. The right end of the delivery pipe 71 is located at the front right side of the inner cavity of the air flotation machine 1, and the left end of the delivery pipe 71 extends out of the left side of the air flotation machine 1. The delivery pipe 71 serves as a gas delivery channel, stably delivering the high-pressure gas generated by the dissolved gas pump to the dissolved gas pipe, ensuring continuous gas supply. The dissolved gas pipe 72 is rotatably sleeved on the outer wall of the delivery pipe 71 via a bearing. The left end of the dissolved gas pipe 72 rotatably extends out of the left side of the air flotation machine 1. The outer wall of the dissolved air tube 72 is provided with several micro-pores 77 that communicate with its inner cavity. When the dissolved air tube 72 rotates, microbubbles are released through the micro-pores. Not only can the volume and density of the microbubbles be adjusted by adjusting the rotation speed of the dissolved air tube 72, but the centrifugal force generated by the rotation of the dissolved air tube 72 can also prevent dirt in the sewage from clogging the micro-pores 77, thereby affecting the release of microbubbles. The rotating component is located at the left front end of the air flotation machine 1. The rotating component can drive the dissolved air tube 72 to rotate and adjust the bubble release characteristics. The rotating assembly includes: a second connecting rod 73, a second pulley 74, a second belt 75, and a second motor 76. One end of the second connecting rod 73 is rotatably mounted on the left front end of the air flotation machine 1 via a bearing. There are two second pulleys 74, which are respectively sleeved on the outer walls of the second connecting rod 73 and the dissolved air tube 72 and locked by set screws. Both ends of the second belt 75 are respectively sleeved on the outer walls of the two second pulleys 74. The second motor 76 is screwed to the left front end of the air flotation machine 1. The other end of the second connecting rod 73 is locked to the output end of the second motor 76 via a coupling. The second motor 76 serves as a drive source to provide stable rotational power.

[0020] As a preferred embodiment, the detection mechanism 6 further includes: a probe 61, a moving groove 62, a conical counterweight head 63, a magnetostrictive displacement sensor 64, a magnetic ring 65, a sleeve 66, and a buoyancy positioning assembly. The top left and right sides of the probe 61 are rotatably mounted on the bottom ends of two first connecting rods 5 via pins. The outer wall of the probe 61 has several moving grooves 62, equidistantly spaced from top to bottom along the circumferential direction, communicating with its inner cavity. The probe 61 serves as the main structure of the detection mechanism, carrying the sensor and the execution assembly, enabling vertical lifting. The conical counterweight head 63 is located at the bottom end of the probe 61, providing downward force to ensure the probe 61 enters the water vertically, and also serves as the mounting base for the traction assembly. The magnetostrictive displacement sensor 64 is located at the top end of the inner cavity of the probe 61, and its bottom end is located at the bottom end of the inner cavity of the probe 61. The telescopic displacement sensor 64 is existing technology and will not be described in detail here. The magnetostrictive displacement sensor 64 is used here to detect the axial displacement of the sleeve 66 with high precision and to provide feedback on the thickness of the scum layer. The magnetic ring 65 is slidably sleeved on the magnetostrictive displacement sensor 64. The magnetic ring 65 and the magnetostrictive displacement sensor 64 are matched. The magnetic ring 65 serves as a moving marker point for displacement detection and works with the magnetostrictive displacement sensor 64 to achieve non-contact measurement. The sleeve 66 is sleeved on the outer wall of the magnetic ring 65. The outer wall of the sleeve 66 slidably penetrates the inner cavity of the moving groove 62 and is slidably sleeved on the outer wall of the probe 61. The sleeve 66 connects the magnetic ring 65 and the buoyancy positioning component to realize the linkage between the sensor signal and the buoyancy adjustment. The buoyancy positioning component is set on the outer wall of the sleeve 66. The buoyancy positioning component adjusts the position of the detection mechanism through buoyancy self-adaptive adjustment to ensure accurate measurement of the scum layer thickness. The buoyancy positioning assembly includes: a support ring float 67, positioning grooves 68, an outer support head 69, a waterproof cloth 610, a first electromagnet 611, and an outer support assembly. The support ring float 67 is disposed at the bottom of the outer wall of the sleeve 66. The outer wall of the support ring float 67 has several positioning grooves 68 evenly spaced along its circumference. The support ring float 67 serves as the core load-bearing structure of the buoyancy positioning assembly, providing basic buoyancy and connecting other components. The outer support head 69 is slidably fitted into the inner cavity of the positioning groove 68, and its outer end slidably extends out of the inner cavity of the positioning groove 68. The support head 69 acts as the actuating element for buoyancy deployment, driving the waterproof cloth 610 to expand the buoyancy area. One end of the waterproof cloth 610 is located at the outer end of the outer support head 69, and the other end of the waterproof cloth 610 is located on the outer wall of the support ring float 67. The waterproof cloth 610 adjusts the buoyancy by changing its area. The first electromagnet 611 is located at the top of the support ring float 67. The first electromagnet 611 is existing technology and will not be described in detail here. The first electromagnet 611 cooperates with the second electromagnet 614 to control the locking and releasing of the outer support assembly. The outer support assembly is located on the top of the outer wall of the sleeve 66. The external support assembly includes: a collar 612, a second connecting rod 613, a second electromagnet 614, a spring 615, and a traction assembly. The collar 612 is slidably sleeved on the top of the outer wall of the sleeve 66. As the core transmission component of the external support assembly, the collar 612 converts the axial displacement of the sleeve 66 into the radial unfolding motion of the external support head 69. There are several second connecting rods 613, with their top ends rotatably mounted on the outer wall of the collar 612 at equal intervals along the circumference via pins. The bottom ends of the second connecting rods 613 are rotatably mounted on the tops of several external support heads 69 via pins. The second connecting rods 613 can convert the linear motion of the collar 612 into the radial unfolding motion of the external support head 69, forming a buoyancy-adjustable robotic arm. The second electromagnet 614 is located at the bottom end of the collar 612. Electromagnet 611 and electromagnet 614 are magnetically attracted to each other. Electromagnet 614 is existing technology and will not be described in detail here. Electromagnet 614 cooperates with electromagnet 611 to realize the locking and releasing control of the outer support assembly. Spring 615 is sleeved on the outer wall of sleeve 66. The top end of spring 615 is engaged with the bottom end of collar 612. The bottom end of spring 615 is engaged with the top end of support ring float 67. Spring 615 is a rotary spring. It undergoes elastic deformation after being squeezed or stretched by external force. It returns to its initial state after the external force is removed. Spring 615 is used here to provide a restoring force to ensure that the outer support assembly automatically retracts after the electromagnet is de-energized. The traction assembly is set in the inner cavity of the conical counterweight head 63. The traction assembly controls the axial position of sleeve 66 by pulling rope 619 to realize the remote adjustment of buoyancy positioning assembly. The traction assembly includes: a third motor 616, a third connecting rod 617, a reel 618, and a pull rope 619. The third motor 616 is screwed into the inner cavity of the conical counterweight head 63. The third motor 616 serves as a drive source, providing stable rotational power to drive the reel 618 in both forward and reverse directions to control the winding and unwinding of the pull rope 619. One end of the third connecting rod 617 is locked to the output end of the third motor 616 via a coupling, and the other end of the third connecting rod 617 is rotatably mounted on the inner wall of the conical counterweight head 63 via a bearing. The reel 618... The reel 618 is sleeved on the outer wall of the third connecting rod 617 and is used to wind and store the pull rope 619. The pull rope 619 is wound and unwound by rotation. There are two pull ropes 619, which are wound on the left and right sides of the outer wall of the reel 618 respectively. The top ends of the two pull ropes 619 can slide into the inner cavity of the probe rod 61. The top ends of the two pull ropes 619 are respectively set on the left and right sides of the bottom end of the sleeve 66. The pull rope 619 connects the reel 618 and the sleeve 66 and transmits traction force to control the axial position of the sleeve 66.

[0021] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0022] Step 1: During use, connect the delivery pipe 71 to the dissolved air delivery pump. The dissolved air delivery pump delivers gas to the inner cavity of the delivery pipe 71. The gas in the inner cavity of the delivery pipe 71 flows into the inner cavity of the dissolved air pipe 72 through the micro-air holes 77, and then flows into the wastewater of the dissolved air flotation machine 1 through the micro-air holes 77. The wastewater is treated by the dissolved air flotation machine 1. When the wastewater is treated by the dissolved air flotation machine 1, after the wastewater reacts effectively with the flocculant and coagulant aid, the raw water enters the air flotation contact zone of the dissolved air flotation machine 1. In the contact zone, it comes into contact with the microbubbles flowing in through the dissolved air pipe 72. The microbubbles attach to the flocculated suspended matter, and the flocs and bubbles rise to the liquid surface together to form scum. As the dissolved air flotation machine 1 is used, the scum that rises to the liquid surface accumulates into a scum layer. The scum layer is scraped off by the scraper of the dissolved air flotation machine 1, which can promote the separation of scum from raw water. Step 2: With the use of the air flotation machine 1, the third motor 616 is started. The third motor 616 drives the reel 618 to rotate through the third connecting rod 617, thereby releasing the pull rope 619 from the reel 618. The first motor 8 is started at a set time. The output end of the first motor 8, through the cooperation between the first connecting rod 9, the first pulley 10 and the first belt 11, can drive the positive and negative lead screw 3 to rotate. The rotation of the positive and negative lead screw 3 can cause the two sliders 4 to move inward synchronously. Thus, under the action of the two first connecting rods 5, the probe rod 61 can be moved downward. At this time, the first electromagnet 611 and the second electromagnet 614 are started. The magnetic attraction between the first electromagnet 611 and the second electromagnet 614 can cause the collar 612 to move downward and compress the spring 615 to undergo elastic deformation. Moving 612 downwards can use the second connecting rod 613 to push the outer support head 69 outwards. The outward movement of the outer support head 69 can drive one end of the waterproof cloth 610 outwards, thereby expanding the waterproof cloth 610 and increasing the area of ​​the support ring float 67. As the probe rod 61 moves downwards until the support ring float 67 moves to the top of the liquid surface of the air flotation machine 1, the viscous resistance of the scum pushes the support ring float 67 upwards, causing it to float on the scum layer. The probe rod 61 will continue to move downwards, causing the sleeve 66 to drive the magnetic ring 65 to move upwards along the outer wall of the probe rod 61 until the bottom of the probe rod 61 moves to a suitable position. At this time, the position of the magnetic ring 65 is recorded by the magnetostrictive displacement sensor 64, thereby determining the position of the sleeve 66. Step 3: After the position recording of the magnetic ring 65 is completed, turn off the first electromagnet 611 and the second electromagnet 614. At this time, under the elastic force of the spring 615, the collar 612 can be pushed upward. The upward movement of the collar 612 can be achieved by using the second connecting rod 613 to pull the outer support head 69 into the inner cavity of the positioning groove 68 until the collar 612 returns to its initial position. Then, start the third motor 616. The third motor 616 drives the reel 618 to rotate in the opposite direction through the third connecting rod 617, thereby pulling the rope. 619 continues to wind around the outer wall of reel 618, and under the action of the pull rope 619, it can pull the sleeve 66 downward, thereby causing the sleeve 66 to move downward below the liquid surface until the sleeve 66 contacts the conical counterweight head 63. At this time, the first electromagnet 611 and the second electromagnet 614 are activated again. Utilizing the cooperation between the first electromagnet 611 and the second electromagnet 614, the magnetic attraction causes the collar 612 to move downward, compressing the spring 615 to cause elastic deformation. The downward movement of the collar 612 can be achieved by utilizing the first electromagnet 611 and the second electromagnet 614. The second linkage 613 pushes the outer support head 69 to move outward. This outward movement of the outer support head 69 causes one end of the waterproof cloth 610 to move outward, thus expanding the waterproof cloth 610 and increasing the area of ​​the support ring float 67. This activates the third motor 616, which, via the third connecting rod 617, drives the reel 618 to rotate. This releases the pull rope 619 from the reel 618, and under the buoyancy of the support ring float 67, moves the sleeve 66 upward until the support ring floats... The top of the body 67 contacts the bottom of the scum layer. At this time, the viscous resistance of the scum can prevent the support ring float 67 from continuing to float. After the position of the support ring float 67 is stable, the position of the magnetic ring 65 is recorded by the magnetostrictive displacement sensor 64, and then the position of the sleeve 66 can be determined. The thickness of the scum layer above the liquid surface of the air flotation machine 1 can be determined by the two positions of the magnetic ring 65 recorded by the magnetostrictive displacement sensor 64. After the detection is completed, the probe rod 61 is pulled to return to the initial position by moving in the opposite direction to the above. Step 4: Adjust the volume and density of microbubbles ejected from the dissolved air tube 72 according to the thickness of the scum layer. When the scum layer is detected to be too thin, start the second motor 76. The second motor 76 drives the dissolved air tube 72 to rotate via the second connecting rod 73, the second pulley 75, and the second belt 75. When the dissolved air tube 72 rotates, the liquid at the micropores 77 on the outer wall of the dissolved air tube 72 generates tangential shear force. When the gas is released from the micropores 77, it will be subjected to stronger shear force, causing the bubbles to break into smaller bubbles more easily. At the same time, the centrifugal force generated by the rotation will accelerate the gas from leaving the micropores, reducing the probability of bubbles merging at the orifice opening and avoiding the formation of large bubbles. This reduces the bubble volume. Under the same air intake, the bubble volume decreases and the bubble density increases. Smaller bubbles have a larger specific surface area (per unit volume). The surface area of ​​the high-density microbubbles allows for more effective adsorption of fine suspended solids or colloidal particles. Simultaneously, the high-density microbubbles form stable "bubble-particle" copolymers, promoting scum layer growth. This reduces the scraping speed of the scraper in the flotation machine 1. Conversely, if the scum layer is too thick, the rotation speed of the second motor 76 is reduced, thereby reducing the rotation speed of the dissolved air tube 72, increasing bubble volume, and decreasing bubble density. Larger bubbles rise faster, accelerating scum layer separation and reducing excessive binding between bubbles and pollutants, preventing the formation of viscous scum. Reducing bubble density alleviates excessive scum accumulation and reduces energy consumption. Furthermore, increasing the scraping speed of the scraper in the flotation machine 1, along with the centrifugal force generated by the rotation of the dissolved air tube 72, prevents dirt in the wastewater from clogging the micropores 77 of the dissolved air tube 72, thus affecting the release of microbubbles.

[0023] This device effectively solves the problems of unstable treatment efficiency and easily affected effluent quality caused by excessively thin or thick scum layers by periodically detecting the thickness of the scum layer and dynamically adjusting the dissolved air bubble parameters. At the same time, the integration of the automated control system further improves the adaptability and operating efficiency of the device, providing strong support for the optimized application of air flotation technology.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal circulation anaerobic ammonia oxidation reactor for protein wastewater, characterized in that, include: Air flotation machine (1); The support (2) is located at the bottom of the left and right sides of the air flotation machine (1). The positive and negative lead screws (3) are rotatably mounted on the top of the left and right sides of the inner cavity of the bracket (2) via bearings at their respective ends. The left end of the positive and negative lead screws (3) extends rotatably out of the left side of the bracket (2). Slider (4), there are two sliders (4), and the two sliders (4) are respectively screwed to the left and right sides of the outer wall of the positive and negative lead screw (3); The top end of the first connecting rod (5) is rotatably mounted on the outer wall of the slider (4) via a pin. The detection mechanism (6) is rotatably mounted on the bottom end of the first connecting rod (5) via a pin. A dissolved air mechanism (7) is provided on the front side of the inner cavity of the air flotation machine (1); A drive assembly is located at the top of the bracket (2) and is used to drive the positive and negative lead screws (3) to rotate.

2. The internal circulation anaerobic ammonia oxidation reactor for protein wastewater according to claim 1, characterized in that: The dissolved gas mechanism (7) includes: The right end of the conveying pipe (71) is located at the front right side of the inner cavity of the air flotation machine (1), and the left end of the conveying pipe (71) extends out of the left side of the air flotation machine (1). The dissolved air tube (72) is rotatably sleeved on the outer wall of the conveying pipe (71) via a bearing. The left end of the dissolved air tube (72) extends rotatably out of the left side of the air flotation machine (1). The outer walls of the conveying pipe (71) and the dissolved air tube (72) are provided with a number of micro-holes (77) that communicate with their inner cavities. A rotating assembly is located at the left front end of the air flotation machine (1), and the rotating assembly is capable of driving the dissolved air tube (72) to rotate.

3. The internal circulation anaerobic ammonia oxidation reactor for protein wastewater according to claim 2, characterized in that: The testing organization (6) includes: The probe (61) has its top end rotatably mounted on the bottom ends of two first connecting rods (5) via pins on the left and right sides. The outer wall of the probe (61) has several movable grooves (62) that communicate with its inner cavity, which are equidistantly spaced from top to bottom along the circumferential direction. A conical counterweight (63) is provided at the bottom end of the probe (61); A magnetostrictive displacement sensor (64) is disposed at the top end of the inner cavity of the probe rod (61), and the bottom end of the magnetostrictive displacement sensor (64) is disposed at the bottom end of the inner cavity of the probe rod (61).

4. The internal circulation anaerobic ammonia oxidation reactor for protein wastewater according to claim 3, characterized in that: The testing facility (6) also includes: A magnetic ring (65) is slidably sleeved on a magnetostrictive displacement sensor (64), and the magnetic ring (65) and the magnetostrictive displacement sensor (64) are matched. Sleeve (66), the sleeve (66) is fitted onto the outer wall of the magnetic ring (65), the outer wall of the sleeve (66) slidably penetrates the inner cavity of the moving groove (62), and slidably fits onto the outer wall of the probe rod (61); A buoyancy positioning component is disposed on the outer wall of the sleeve (66).

5. The internal circulation anaerobic ammonia oxidation reactor for protein wastewater according to claim 4, characterized in that: The buoyancy positioning component includes: Support ring float (67), the support ring float (67) is disposed at the bottom of the outer wall of the sleeve (66), and the outer wall of the support ring float (67) is provided with a plurality of positioning grooves (68) at equal intervals along the circumference. An outer support head (69) is slidably adapted to be inserted into the inner cavity of a positioning groove (68), and the outer end of the outer support head (69) extends slidably out of the inner cavity of the positioning groove (68). Waterproof cloth (610), one end of which is disposed at the outer end of the outer support head (69), and the other end of which is disposed at the outer wall of the support ring float (67); An external support assembly is disposed on the top of the outer wall of the sleeve (66).

6. The internal circulation anaerobic ammonia oxidation reactor for protein wastewater according to claim 5, characterized in that: The external support component includes: A collar (612) is slidably fitted onto the top of the outer wall of the sleeve (66); The second link (613) has a number of links. The top ends of the links (613) are rotatably disposed on the outer wall of the collar (612) at equal intervals along the circumference and via pins. The bottom ends of the links (613) are rotatably disposed on the top ends of the outer supports (69) via pins. Spring (615), the spring (615) is sleeved on the outer wall of sleeve (66), the top end of the spring (615) is engaged with the bottom end of collar (612), and the bottom end of the spring (615) is engaged with the top end of support ring float (67). A traction assembly is disposed in the inner cavity of a conical counterweight head (63).

7. The internal circulation anaerobic ammonia oxidation reactor for protein wastewater according to claim 6, characterized in that: The traction component includes: The third motor (616) is screwed into the inner cavity of the conical counterweight head (63); The third connecting rod (617) has one end locked to the output end of the third motor (616) by a coupling, and the other end of the third connecting rod (617) is rotatably set on the inner wall of the conical counterweight head (63) by a bearing. A reel (618) is sleeved on the outer wall of a third connecting rod (617); Pull rope (619), there are two pull ropes (619), the two pull ropes (619) are respectively wound around the left and right sides of the outer wall of the reel (618), the top ends of the two pull ropes (619) can slide into the inner cavity of the probe rod (61), and the top ends of the two pull ropes (619) are respectively set on the left and right sides of the bottom end of the sleeve (66).

8. The internal circulation anaerobic ammonia oxidation reactor for protein wastewater according to claim 7, characterized in that: The testing facility (6) also includes: The first electromagnet (611) is disposed at the top of the support ring float (67); The second electromagnet (614) is disposed at the bottom end of the collar (612), and the first electromagnet (611) and the second electromagnet (614) are magnetically attracted to each other.

9. An internal circulation anaerobic ammonia oxidation process for protein wastewater, applied in an internal circulation anaerobic ammonia oxidation reactor for protein wastewater as described in claim 8, characterized in that: Includes the following steps: S1. The pretreated protein wastewater is fed into the air flotation machine (1), and flocculants and coagulants are added. The flocculation reaction is completed in the air flotation contact zone to form suspended flocs. S2. Gas is introduced into the delivery pipe (71) of the gas dissolving mechanism (7) through the gas delivery pump. The gas flows into the gas dissolving pipe (72) through the micro air holes (77) of the delivery pipe (71). Finally, uniform micro bubbles are released through the micro air holes (77) of the gas dissolving pipe (72) to fully contact and adhere to the suspended flocs. S3. The flocs with attached microbubbles float to the liquid surface to form a scum layer; the drive assembly is started at a time to drive the probe (61) of the detection mechanism (6) to move down, the support ring float (67) and the waterproof cloth (610) cooperate to position the scum layer, and the thickness of the scum layer is detected by the magnetostrictive displacement sensor (64) and the magnetic ring (65). S4. Based on the thickness detected, the rotation speed of the dissolved air pipe (72) is adjusted by the second motor (76), and the scraping speed of the air flotation machine (1) is adjusted synchronously. The scum is scraped off and separated by the scraper, and the treated wastewater is discharged in compliance with the standards.

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