A short-range nitrification denitrification process model parameter determination test device

Abstract

The present application relates to wastewater treatment technical field, specifically to a kind of short-cut nitrification denitrification process model parameter determination test device, including reaction kettle, contact layer is fixedly connected in reaction kettle, the contact layer and the interlayer formed between reaction kettle inner wall, the interlayer is used to fill heating solution, and interlayer fixedly connected with heating wire and temperature sensor;The top of the reaction kettle is fixedly connected with gas inlet pipe, and the top of the reaction kettle is fixedly connected with conveying assembly;The inner circle center of the gas inlet pipe is fixedly connected with inner conveying pipe, and the gas inlet pipe and conveying pipe have a interlayer.This application is driven by T-shaped adjusting lever, and adjusting conveying pipe is waved, and the conveying track of sodium hydroxide is waved downward to the lower region in reaction kettle and mixed with waste liquid, and sodium hydroxide is dynamically put through the waved track, and the coverage is wide, and the pH adjusting time is shortened by fast and uniform mixing.

Description

TECHNICAL FIELD

[0001] The present application relates to wastewater treatment technical field, specifically to a short-cut nitrification and denitrification process model parameter determination test device. BACKGROUND

[0002] In the prior art, by using SBR reactor, a control strategy combining high temperature, high pH value and low DO is used to realize stable operation of short-cut nitrification and denitrification denitrification process, and the change rule of ammonia nitrogen, nitrate nitrogen and nitrite nitrogen in the nitrification stage is studied.

[0003] In the prior art, during the operation of the short-cut nitrification and denitrification process, an aeration pipe is usually inserted into the device to provide oxygen for the waste liquid in the interior, and the aeration pipe is usually fixedly arranged in the interior of the reaction kettle, and the oxygen supply is fixed, so that the oxygen cannot be well distributed in the interior of the reaction kettle.

[0004] Therefore, a short-cut nitrification and denitrification process model parameter determination test device is proposed to solve the problems mentioned above. SUMMARY

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A short-cut nitrification and denitrification process model parameter determination test device, comprising a reaction kettle, a contact layer is fixedly connected in the reaction kettle, a gap is formed between the contact layer and the inner wall of the reaction kettle, the gap is used to fill a heating solution, and heating wires and temperature sensors are fixedly connected in the gap; an air inlet pipe is fixedly connected to the top of the reaction kettle, and a conveying assembly is fixedly connected to the top of the reaction kettle; a inner conveying pipe is fixedly connected to the center of the air inlet pipe, and a gap is formed between the air inlet pipe and the conveying pipe, which is used to convey oxygen, a plurality of aeration holes are arranged on the surface of the area in the reaction kettle at the lower end of the air inlet pipe, and the plurality of aeration holes are in communication with the gap, a rotating disc is rotatably connected to the bottom of the inner conveying pipe, one end of the rotating disc is fixedly connected with the contact conveying pipe, the aeration holes are in communication with the rotating disc and the contact conveying pipe, one end of the contact conveying pipe is fixedly connected with a stress rod, and the upper end of the stress rod is fixedly connected with a gear ring.

[0007] Preferably, the side wall of the contact layer is rotatably connected with a gear ring, the upper end of the side wall of the reaction kettle is embedded with a liquid inlet pipe, the liquid inlet pipe is used to discharge the waste liquid from the outside into the reaction kettle for reaction determination, and a liquid discharge valve is arranged below the side wall of the reaction kettle, which facilitates the discharge of the measured liquid in the reaction kettle.

[0008] Preferably, a dissolved oxygen instrument, a nitrite detector, an ammonia nitrogen detector and a PH detector are arranged on the top of the reaction kettle, and the contact ends of the dissolved oxygen instrument, the nitrite detector, the ammonia nitrogen detector and the PH detector are located in the contact layer and are in contact with the waste water in the interior, which are used to detect the waste water.

[0009] Preferably, the conveying assembly comprises a vertical pipe fixedly connected to the reaction kettle, the top of the vertical pipe is fixedly connected to the containing frame, the bottom of the vertical pipe is fixedly connected to the auger frame and communicates with the auger frame, the auger frame is rotatably connected to an auger, the top of the auger is fixedly connected to the center of the driving gear, and the auger frame is fixedly connected to the base.

[0010] Preferably, the base is fixedly connected to the side wall of the contact layer, the driving gear is rotatably connected to the top of the auger frame, the driving gear is drivingly connected to the bevel gear below the bevel gear set, the bevel gear set is rotatably connected to the base, the other end of the bevel gear set is fixedly connected to the screw rod at the center of the bevel gear, and the screw rod is rotatably connected to the side wall of the limiting frame.

[0011] Preferably, the limiting frame is fixedly connected to the side wall of the base, the screw rod is screwedly connected to the internal thread of the threaded sleeve, the bottom of the threaded sleeve is fixedly connected to the sliding rod, the T-shaped adjusting rod is slidingly connected in the T-shaped sliding groove in the lower region of the sliding rod, the T-shaped adjusting rod is slidingly inserted into the arc-shaped sliding groove on the horizontal plate below, and the horizontal plate is fixedly connected to the limiting frame.

[0012] Preferably, the side wall of the reaction kettle is fixedly connected to a driving motor, the output shaft of the driving motor is fixedly connected to the center of the bevel gear at the upper end of the bevel gear set, and the driving gear is meshed with the gear ring; a discharge port is arranged below the auger frame, a mixing rod is rotatably connected to the bottom of the auger frame, and a plurality of groups of stirring blades are arranged on the side wall of the mixing rod.

[0013] Preferably, the conveying assembly is provided with a plurality of groups, a suction magnetic ring is fixedly connected to the center of the driving gear of the conveying assembly, the center of the suction magnetic ring is in contact with the transmission shaft of the bevel gear below the bevel gear set, the suction magnetic ring is electrified to be magnetically attracted to the transmission shaft, so that the bevel gear set drives the driving gear and the auger to rotate through the suction magnetic ring.

[0014] Preferably, the discharge port below the auger frame is connected to one end of a corrugated pipe, the other end of the corrugated pipe is fixedly connected to an adjusting conveying pipe, a contact rod is movably connected to the top side wall of the adjusting conveying pipe, and the other end of the contact rod is movably connected to the bottom of the T-shaped adjusting rod.

[0015] Preferably, the T-shaped adjusting rod is used to change the angle and the front and back position between the adjusting conveying pipe and the auger frame.

[0016] Compared with the prior art, the short-range nitrification denitrification process model parameter determination test device has the following beneficial effects:

[0017] 1. In this invention, a dissolved oxygen meter, a nitrite meter, an ammonia nitrogen meter, and a pH meter are integrated. Data is transmitted in real time through a controller and a 5G module, which facilitates researchers to remotely monitor the experimental process and record data, thereby improving experimental efficiency and convenience, and facilitating data analysis and model optimization.

[0018] The T-shaped regulating rod drives the regulating delivery pipe to swing in a wavy line. The sodium hydroxide is delivered downwards in a wavy pattern to the lower area inside the reactor to mix with the waste liquid. The sodium hydroxide is dynamically added in a wavy pattern, covering a wide area (ring distribution). The rapid and uniform mixing shortens the pH adjustment time, allowing the nitrification reaction to enter and maintain the optimal pH range (7.5-8.5) more quickly. This improves the ammonia nitrogen conversion efficiency and the nitrite accumulation rate. Efficient mixing may reduce the total amount of alkali solution required to reach the target pH.

[0019] 2. This invention utilizes a combined axial and radial stirring mode with a contact conveying pipe and a mixing rod, combined with dynamic dosing, to significantly improve the contact efficiency between reactants (ammonia nitrogen, alkali, and oxygen) and microorganisms (nitrifying bacteria), reduce concentration gradients, and accelerate the reaction rate. Rotary aeration can change the distribution of oxygen in the reactor as needed, helping to create a DO gradient environment conducive to nitrite accumulation. The combination of fixed and rotary aeration provides greater operational flexibility. When the force rod rotates, it scrapes the sidewalls of the contact layer, preventing the adhesion and scaling of materials such as sodium hydroxide, ensuring heat transfer efficiency and the effective volume of the reactor.

[0020] 3. This invention provides two aeration methods: fixed and movable (rotating). Oxygen can enter the rotating contact conveying pipe through the inner conveying pipe for radial distribution aeration. Combined with real-time monitoring by a dissolved oxygen meter, by adjusting the aeration volume and method (fixed, rotating, or a combination), DO can be more accurately controlled within the optimal range required for short-cut nitrification, thereby increasing the nitrite accumulation rate. The combined effect of dynamic aeration and enhanced stirring improves the mass transfer rate and utilization of oxygen, and reduces energy consumption.

[0021] 4. This invention allows for independent control of stirring (contact delivery pipe system) or combined stirring and dosing through the engagement and disengagement of the adsorption magnetic ring. Aeration can also be carried out independently or in conjunction with dosing or stirring. Experimental conditions can be flexibly set, for example, to study the effects of different operating modes such as stirring alone, stirring and aeration simultaneously with dosing, on short-cut nitrification performance. Through dynamic dosing and enhanced mixing, a suitable and uniform pH and substrate concentration are maintained. Through flexible aeration and real-time DO control, the DO environment is optimized, promoting the efficient accumulation of nitrite. The structure is compact, reducing cost and energy consumption. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0023] Figure 1 Schematic diagram of the three-dimensional structure of the present application;

[0024] Figure 2 Schematic diagram of the sandwich and contact layer structure of the present application;

[0025] Figure 3 Schematic diagram of the internal structure of the reaction kettle of the present application Figure 1 ;

[0026] Figure 4 Schematic diagram of the internal structure of the reaction kettle of the present application Figure 2 ;

[0027] Figure 5 Schematic diagram of the enlarged structure at A in the present application Figure 2 ;

[0028] Figure 6 Schematic diagram of the conveying assembly structure of the present application Figure 1 ;

[0029] Figure 7 Schematic diagram of the conveying assembly structure of the present application Figure 2 ;

[0030] Figure 8 Schematic diagram of the conveying track structure of the multiple sets of adjusting conveying pipes of the present application.

[0031] In the figure: 1, reaction kettle; 2, liquid inlet pipe; 3, dissolved oxygen instrument; 4, nitrite detection instrument; 5, ammonia nitrogen detection instrument; 6, PH detection instrument; 7, gas inlet pipe; 8, conveying assembly; 9, liquid outlet valve;

[0032] 11, sandwich; 12, contact layer; 13, gear ring;

[0033] 71, inner conveying pipe; 72, aeration through hole; 73, rotating disc; 74, contact conveying pipe; 75, force bar;

[0034] 81, vertical pipe; 82, containing frame; 83, auger frame; 84, driving gear; 85, base; 86, bevel gear set; 87, limiting frame; 88, screw; 89, threaded sleeve; 810, sliding rod; 811, T-shaped adjusting rod; 812, cross plate; 813, arc-shaped sliding groove; 814, driving motor; 815, conveying track; 831, corrugated pipe; 832, adjusting conveying pipe; 833, contact rod; 834, mixing rod. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] Please refer to Figure 1 - Figure 8 The short-range nitrification denitrification process model parameter determination test device in the embodiment comprises a reaction kettle 1, a contact layer 12 is fixedly connected in the reaction kettle 1, a layer 11 is formed between the contact layer 12 and the inner wall of the reaction kettle 1, the layer 11 is used for filling a heating solution, and heating wires and a temperature sensor are fixedly connected in the layer 11; a gear ring 13 is rotatably connected to the side wall of the contact layer 12, a liquid inlet pipe 2 is embedded in the upper end side wall of the reaction kettle 1, the liquid inlet pipe 2 is used for discharging waste liquid from the outside into the reaction kettle 1 for reaction determination, a liquid discharge valve 9 is arranged below the side wall of the reaction kettle 1, which facilitates the discharge of the determined liquid in the reaction kettle 1, an adjusting valve (not shown in the figure) is arranged at the top of the reaction kettle 1, which facilitates the conveying of the material through the adjusting valve; a controller is arranged on the reaction kettle 1, and the controller is connected with a dissolved oxygen instrument 3, a nitrite detector 4, an ammonia nitrogen detector 5 and a PH detector 6, a 5G communication module is arranged on the controller, and the detected data is transmitted to the display end outside through the 5G communication module.

[0037] As Figures 1-8 shown, the top of the reaction kettle 1 is provided with the dissolved oxygen instrument 3, the nitrite detector 4, the ammonia nitrogen detector 5 and the PH detector 6, and the contact ends of the dissolved oxygen instrument 3, the nitrite detector 4, the ammonia nitrogen detector 5 and the PH detector 6 are located in the contact layer 12 and contact with the wastewater in the interior, which is used for detecting the wastewater; the dissolved oxygen instrument 3 measures the dissolved oxygen concentration (DO value) in the wastewater, the dissolved oxygen is the key condition of the nitrification reaction, and the nitrifying bacteria (such as nitrite bacteria and nitrate bacteria) need oxygen to oxidize ammonia nitrogen into nitrite and nitrate, by monitoring the DO value, the aeration amount (such as conveying oxygen through the air inlet pipe 7) can be controlled to ensure that the nitrification reaction is carried out in a suitable oxidation environment, while avoiding excessive aeration to increase energy consumption;

[0038] The nitrite detector 4 measures the concentration of nitrite (NO2⁻-N) in the wastewater, the core goal of the short-range nitrification denitrification process is to oxidize ammonia nitrogen (NH3-N / NH4⁺-N) into nitrite instead of nitrate, so as to shorten the reaction path and reduce the demand for carbon source, and the nitrite concentration directly reflects the progress of the nitrification reaction, which is a key indicator for judging whether the process realizes “short-range” or not;

[0039] The ammonia nitrogen detector 5 measures the concentration of ammonia nitrogen (NH3-N / NH4⁺-N) in the wastewater. Ammonia nitrogen is the substrate of nitrification reaction, and its concentration change reflects the nitrification efficiency. By monitoring the ammonia nitrogen removal rate, the treatment capacity of the process for nitrogen pollutants can be evaluated, and parameters such as reaction time and pH value can be optimized.

[0040] The pH detector 6 measures the acidity and alkalinity (pH value) of the wastewater. The pH value has a significant impact on the activity of nitrifying bacteria. The best nitrification reaction usually occurs in a neutral to weakly alkaline environment (pH ≈ 7.5-8.5). By monitoring the pH value, the composition of the inlet liquid or the addition of alkaline substances can be adjusted to maintain suitable conditions in the reaction kettle and prevent acidification from reducing nitrification efficiency. The top of the reaction kettle 1 is fixedly connected with an air inlet pipe 7, and the top of the reaction kettle 1 is fixedly connected with a conveying assembly 8.

[0041] Further, as shown in Figures 1-8 The inner conveying pipe 71 is fixedly connected with the inner circle of the air inlet pipe 7. The air inlet pipe 7 and the conveying pipe 71 have a sandwich layer. Unidirectional valves are arranged on the side walls of the air inlet pipe 7 and the conveying pipe 71. Oxygen is conveyed through the unidirectional valves. The sandwich layer is used for conveying oxygen. A plurality of groups of aeration holes 72 are arranged on the surface of the inner area of the reaction kettle 1 at the lower end of the air inlet pipe 7. The plurality of groups of aeration holes 72 are in communication with the sandwich layer. The bottom of the inner conveying pipe 71 is rotatably connected with a rotating disc 73. One end of the rotating disc 73 is fixedly connected with a contact conveying pipe 74. The aeration holes 72 are in communication with the rotating disc 73 and the contact conveying pipe 74. One end of the contact conveying pipe 74 is fixedly connected with a stress rod 75. The contact conveying pipe 74 is provided with aeration holes 72. The upper end of the stress rod 75 is fixedly connected with the gear ring 13.

[0042] The gear ring 13 rotates and moves the stress rod 75 at the same time. The stress rod 75 contacts and scrapes the side wall of the contact layer 12 to prevent sodium hydroxide from adhering to the side wall of the contact layer 12. Then the stress rod 75 drives the contact conveying pipe 74 to rotate around the center of the reaction kettle 1. The contact conveying pipe 74 rotates circumferentially to stir the waste liquid in the interior while the sodium hydroxide is being added. The mixing rod 834 axially stirs the waste liquid;

[0043] When it is necessary to stir the reaction kettle 1 alone, the adsorbing magnetic ring is powered off, the driving motor 814 can drive the gear ring 13 to rotate alone, and the gear ring 13 drives the contact conveying pipe 74 and the stress rod 75 to rotate to stir and mix the waste liquid in the interior;

[0044] When it is needed to add oxygen in the interior, the one-way valve provided on the sidewall of the air inlet pipe 7 is connected with the oxygen delivery device outside, and then the oxygen is delivered into the inner layer of the air inlet pipe 7 and then delivered into the reaction kettle 1 through the aeration holes 72; at the same time, the inner delivery pipe 71 can be connected with the oxygen delivery device outside, and then the oxygen is delivered into the inner delivery pipe 71 and then enters into the contact delivery pipe 74 through the rotating disc 73, and then the oxygen is delivered into the radial position in the reaction kettle 1 through the aeration holes 72 on the contact delivery pipe 74, and then the contact delivery pipe 74 is adjusted by the gear ring 13 to adjust the radial position of the aeration of the waste liquid in the reaction kettle 1.

[0045] Or, the sodium hydroxide is added at the same time and oxygen is delivered, so that the sodium hydroxide and the oxygen can be simultaneously delivered into the reaction kettle 1 to react with the waste water.

[0046] At the same time, as shown in Figures 1-8 the delivery assembly 8 comprises a vertical pipe 81 fixedly connected to the reaction kettle 1, a containing frame 82 fixedly connected to the top of the vertical pipe 81, an auger frame 83 fixedly connected to the bottom of the vertical pipe 81 and in communication with the inside of the auger frame 83, an auger rotatably connected to the inside of the auger frame 83, the top of the auger fixedly connected to the center of the driving gear 84, the auger frame 83 fixedly connected to the base 85, the base 85 fixedly connected to the sidewall of the contact layer 12, the driving gear 84 rotatably connected to the top of the auger frame 83, the driving gear 84 drivingly connected to the bevel gears below the bevel gear set 86, the bevel gear set 86 rotatably connected to the base 85, the other end of the bevel gear set 86 fixedly connected to the screw rod 88, the screw rod 88 rotatably connected to the sidewall of the limiting frame 87, the limiting frame 87 fixedly connected to the sidewall of the base 85, the screw rod 88 threadedly connected to the threaded sleeve 89, the threaded sleeve 89 fixedly connected to the sliding rod 810, a T-shaped adjusting rod 811 slidably connected to the T-shaped sliding groove in the lower region of the sliding rod 810, the T-shaped adjusting rod 811 slidably inserted into the arc-shaped sliding groove 813 on the horizontal plate 812, the horizontal plate 812 fixedly connected to the limiting frame 87, a driving motor 814 fixedly connected to the sidewall of the reaction kettle 1, the output shaft of the driving motor 814 fixedly connected to the center of the bevel gear above the bevel gear set 86, and the driving gear 84 meshed with the gear ring 13; a discharge port is arranged below the auger frame 83; an mixing rod 834 is rotatably connected to the bottom of the auger frame 83, a plurality of stirring blades are arranged on the sidewall of the mixing rod 834, and the distance between the bottom of the mixing rod 834 and the bottom of the reaction kettle is 10-20 cm.

[0047] Specifically, the vertical pipe 81, the containing frame 82, the auger frame 83 and the auger are made of stainless steel.

[0048] When the PH value needs to be adjusted, sodium hydroxide is placed in the containing frame 82 in advance, and then the driving motor 814 is started to rotate the bevel gear set 86, which drives the driving gear 84, the auger and the screw rod 88 to rotate, the driving gear 84 drives the gear ring 13 to rotate, the gear ring 13 drives another driving gear 84 (the adsorbing magnetic ring is powered on) to rotate, and the driving gear 84 drives another auger and the mixing rod 834 to rotate;

[0049] The screw rod 88 drives the threaded sleeve 89 to move, and the threaded sleeve 89 drives the sliding rod 810 to move in the process of moving, the sliding rod 810 drives the lower T-shaped adjusting rod 811 to slide in the arc-shaped sliding groove 813 on the horizontal plate 812, so that the T-shaped adjusting rod 811 slides left and right while moving forward and backward, and the movement track of the T-shaped adjusting rod 811 is in a wavy line shape;

[0050] The T-shaped adjusting rod 811 drives the lower connected contact rod 833 to move, the contact rod 833 pulls the adjusting conveying pipe 832 to open the adjusting angle (swing to the center of the reaction kettle 1) while swinging forward and backward, so that the adjusting conveying pipe 832 receives the sodium hydroxide conveyed by the auger, and the conveying track 815 of the sodium hydroxide is in a wavy shape and is conveyed downward to the lower area in the reaction kettle 1 to mix with the waste liquid;

[0051] A plurality of adjusting conveying pipes 832 are arranged at equal distances on the inner circular side wall of the reaction kettle 1, and the sodium hydroxide is conveyed in a ring shape to the reaction area in the reaction kettle 1.

[0052] Further, as shown in Figures 1-8 , the conveying assembly 8 is provided with a plurality of groups, and the driving gear 84 on the conveying assembly 8 is fixedly connected at the center thereof with an adsorbing magnetic ring, the center of the adsorbing magnetic ring is in contact with the bevel gear transmission shaft below the bevel gear set 86, the adsorbing magnetic ring is powered on for magnetic attraction with the transmission shaft, so that the bevel gear set 86 drives the driving gear 84 and the auger to rotate through the adsorbing magnetic ring.

[0053] Finally, as shown in Figures 1-8 , the discharge port below the auger frame 83 is connected with one end of the bellows 831, the other end of the bellows 831 is fixedly connected with the adjusting conveying pipe 832, the contact rod 833 is movably connected to the top side wall of the adjusting conveying pipe 832, and the other end of the contact rod 833 is movably connected to the bottom of the T-shaped adjusting rod 811; the T-shaped adjusting rod 811 is used to change the angle and the forward and backward position between the adjusting conveying pipe 832 and the auger frame 83.

[0054] As shown in Figures 1-8 , the principle of the short-range nitrification denitrification process model parameter determination test device provided by the embodiment is as follows:

[0055] When the wastewater is determined, the wastewater is transported into the contact layer 12 through the liquid inlet pipe 2, and then the materials required for the reaction are put into the contact layer 12 through the adjusting valve to mix with the wastewater, and the wastewater is detected through the dissolved oxygen meter 3, the nitrite detector 4, the ammonia nitrogen detector 5 and the PH detector 6, and then the oxygen and sodium hydroxide are transported into the reaction kettle 1 through the gas inlet pipe 7 and the conveying assembly 8 to react.

[0056] The mounting mode, the connecting mode or the setting mode disclosed in the embodiment are all common mechanical connections

[0057] The mounting mode, the connecting mode or the setting mode disclosed in the embodiment are all common mechanical connections

[0058] It should be noted that, in this document, the terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In addition, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0059] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A test device for determining the parameters of a short-range nitrification denitrification process model, comprising a reactor (1), a contact layer (12) fixedly connected inside the reactor (1), an interlayer (11) formed between the contact layer (12) and the inner wall of the reactor (1), the interlayer (11) being used to fill a heating solution, and a heating wire and a temperature sensor fixedly connected inside the interlayer (11); Its features are: An air inlet pipe (7) is fixedly connected to the top of the reactor (1), and a conveying assembly (8) is fixedly connected to the top of the reactor (1). An inner conveying pipe (71) is fixedly connected to the center of the air inlet pipe (7). There is a sandwich between the air inlet pipe (7) and the inner conveying pipe (71). The sandwich is used to convey oxygen. The lower end of the air inlet pipe (7) is provided with multiple sets of aeration holes (72) on the surface of the area inside the reactor (1). The multiple sets of aeration holes (72) are connected to the sandwich. A rotating disk (73) is rotatably connected to the bottom of the inner conveying pipe (71). One end of the rotating disk (73) is fixedly connected to the contact conveying pipe (74). The aeration holes (72) are connected to the rotating disk (73) and the contact conveying pipe (74). One end of the contact conveying pipe (74) is fixedly connected to the force rod (75). The upper end of the force rod (75) is fixedly connected to the gear ring (13). The conveying assembly (8) includes a vertical pipe (81), which is fixedly connected to the reactor (1). The top of the vertical pipe (81) is fixedly connected to the receiving frame (82), and the bottom of the vertical pipe (81) is fixedly connected to the auger frame (83) and communicates with the inside of the auger frame (83). An auger is rotatably connected inside the auger frame (83). The top of the auger is fixedly connected to the center of the drive gear (84). The auger frame (83) is fixedly connected to the base (85). The base (85) is fixedly connected to the side wall of the contact layer (12), the drive gear (84) is rotatably connected to the top of the auger frame (83), the drive gear (84) is driven by the bevel gear below the bevel gear set (86), the bevel gear set (86) is rotatably connected to the base (85), the center of the bevel gear at the other end of the bevel gear set (86) is fixedly connected to the screw (88), and the screw (88) is rotatably connected to the side wall of the limiting frame (87). The limiting frame (87) is fixedly connected to the side wall of the base (85), the screw (88) is internally threaded to the threaded sleeve (89), the bottom of the threaded sleeve (89) is fixedly connected to the sliding rod (810), a T-shaped adjusting rod (811) is slidably connected in the T-shaped groove in the area below the sliding rod (810), the T-shaped adjusting rod (811) is slidably inserted into the arc-shaped groove (813) on the horizontal plate (812), and the horizontal plate (812) is fixedly connected to the limiting frame (87); The discharge port below the auger frame (83) is connected to one end of the corrugated pipe (831), and the other end of the corrugated pipe (831) is fixedly connected to the regulating conveying pipe (832). A contact rod (833) is movably connected to the top side wall of the regulating conveying pipe (832), and the other end of the contact rod (833) is movably connected to the bottom of the T-shaped adjusting rod (811).

2. The experimental apparatus for determining model parameters of a short-range nitrification denitrification process according to claim 1, characterized in that: The contact layer (12) is rotatably connected to a toothed ring (13). The upper side wall of the reactor (1) is embedded with a liquid inlet pipe (2). The liquid inlet pipe (2) is used to discharge external waste liquid into the reactor (1) for reaction measurement. The side wall of the reactor (1) is provided with a drain valve (9) to facilitate the discharge of the measured liquid in the reactor (1) of the subsequent component.

3. The experimental apparatus for determining model parameters of a short-range nitrification denitrification process according to claim 2, characterized in that: The top of the reactor (1) is equipped with a dissolved oxygen meter (3), a nitrite detector (4), an ammonia nitrogen detector (5), and a pH meter (6). The contact ends of the dissolved oxygen meter (3), the nitrite detector (4), the ammonia nitrogen detector (5), and the pH meter (6) are located inside the contact layer (12) and are in contact with the wastewater inside, for the purpose of detecting the wastewater.

4. The experimental apparatus for determining model parameters of a short-range nitrification denitrification process according to claim 1, characterized in that: The side wall of the reactor (1) is fixedly connected to a drive motor (814). The output shaft of the drive motor (814) is fixedly connected to the center of the bevel gear at the upper end of the bevel gear set (86). The drive gear (84) meshes with the gear ring (13). A discharge port is provided below the auger frame (83). A mixing rod (834) is rotatably connected to the bottom of the auger frame (83). Multiple sets of stirring blades are provided on the side wall of the mixing rod (834).

5. The experimental apparatus for determining model parameters of a short-range nitrification denitrification process according to claim 1, characterized in that: The conveying assembly (8) is provided with multiple sets. A magnetic adsorption ring is fixedly connected to the center of the drive gear (84) on the conveying assembly (8). The center of the magnetic adsorption ring is in contact with the bevel gear drive shaft below the bevel gear set (86). The magnetic adsorption ring is energized to magnetically attract the drive shaft, so that the bevel gear set (86) drives the drive gear (84) and the auger to rotate through the magnetic adsorption ring.

6. The experimental apparatus for determining model parameters of a short-range nitrification denitrification process according to claim 1, characterized in that: The T-shaped adjusting rod (811) is used to change the angle and front-back position between the adjusting conveying pipe (832) and the auger frame (83).

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