Multi-stage filtration treatment device for food additive production wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a food additive production wastewater multi-stage filtration treatment device which comprises a wastewater pool body, a stage filtration pool and a dosing reaction pool are sequentially arranged in the wastewater pool body in the water flow direction, a medicine storage assembly is arranged in the dosing reaction pool, and a dosing assembly is assembled at the bottom of the medicine storage assembly. An adjusting assembly is arranged between the chemical storage assembly and the chemical feeding assembly, and the chemical feeding assembly feeds back the pollutant concentration of the corresponding water layer in real time by means of the reverse thrust change during spraying of the chemical feeding nozzle, and the chemical spraying flow is automatically controlled in cooperation with stretching and retracting of a first spring and tightness adjustment of a tensioning rope; after the pollutants of the current water layer are removed, medicament accumulation enables the weight of the medicament storage assembly to change, the whole device is driven to ascend and descend to the water area of the next layer, switching dosing of different water layers can be completed without manual intervention, sufficient treatment of the pollutants of all the water layers is guaranteed, and the problem of uneven treatment caused by dosing of a single water layer is solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage filtration treatment device for wastewater from food additive production. Background Technology

[0002] In patent application CN213595930U, a base and a movable shaft are included. The base has a slider inside, and a collection tank is located on top of the slider. A side plate is located on the side of the collection tank, and a slot is formed inside the side plate. A connecting rod is located inside the slot, and a limiting post is located on the side of the connecting rod. A filter tank is located on top of the limiting post, and a top plate is located on the outside of the filter tank. A connecting block is located inside the top plate, and a fixing plate is located at the bottom of the connecting block. An elastic spring is connected to the end of the fixing plate, and an abutment plate is located at the end of the elastic spring. The movable shaft is located on top of the filter tank. The advantage is that this visual wastewater treatment device for activated carbon production in food additives allows users to easily adjust the height of the tank, facilitating precise collection and treatment of wastewater.

[0003] In existing technologies, including the aforementioned patents, wastewater from food additive production needs to be filtered through multi-stage filtration ponds. After most impurities in the wastewater are removed by the filtration mechanism, chemicals are added to the wastewater pond to remove the remaining impurities. However, existing chemical addition methods are mostly quantitative or timed additions, which cannot dynamically adjust the dosage according to the actual pollution level of the wastewater, making it difficult to ensure accurate chemical addition. To achieve precise dosing, additional equipment needs to be set up for multiple tests and replenishments of chemicals, which not only increases costs but also interrupts the wastewater treatment process, seriously affecting the overall treatment efficiency. At the same time, the pollutants in food additive wastewater are distributed in different water layers. The upper layer is mostly floating matter (such as oil and light raw material residues), while the lower layer is mostly solid particle sediment. A single dosing location and fixed dosage cannot be adapted to the pollution characteristics of the entire water layer, resulting in uneven treatment effects and excessive pollutant residues in some areas. Summary of the Invention

[0004] The problem this invention aims to solve is that in the existing treatment of wastewater from food additive production, the addition of chemicals requires multiple tests and replenishments to ensure accurate dosage, and it cannot be adapted to the pollution characteristics of different water layers, thus affecting treatment efficiency and effectiveness.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a multi-stage filtration treatment device for food additive production wastewater, comprising a wastewater tank body, wherein a graded filtration tank and a dosing reaction tank are arranged sequentially along the water flow direction inside the wastewater tank body, a dosing reaction tank is provided in the dosing reaction tank, a dosing component is assembled at the bottom of the dosing component, an adjustment component for adjusting the dosing state is provided between the dosing component and the dosing component, and a control component for controlling the dosage is provided below the dosing component; The graded filtration tank is used to remove large particulate impurities, suspended solids and some colloids from wastewater in stages, providing pretreated water quality for chemical dosing reactions; The drug storage component is used to store and transport treatment agents, and can adjust the water level according to its own weight to meet the drug dosing requirements of different water levels. The dosing assembly is used to precisely spray the agent into the water body and to provide feedback on the pollution removal status through the jet thrust. The adjustment component is used to switch the dosing direction and aeration position according to the degree of water pollution. The control component is used to adjust the spray flow rate of the dosing component in conjunction with the dosing component, thereby achieving dynamic control of the dosage.

[0006] Preferably, the drug storage assembly includes a drug storage tank, which is located inside the drug dosing reaction tank. The bottom of the drug storage tank is provided with a telescopic base, and the telescopic base is provided with rollers. The top of the drug storage tank is provided with a delivery pipe assembly for connecting external equipment. The top of the drug storage tank has a first aeration hole arranged in a circumferential array, and the side wall of the drug storage tank has a second aeration hole arranged in a circumferential array.

[0007] Preferably, the dosing assembly includes dosing nozzles arranged in a circumferential array on the storage tank, and a limiting rod is provided on the storage tank. One end of the limiting rod is inserted into a plug rod, and a first spring is sleeved on the plug rod.

[0008] Preferably, the dosing nozzle is provided with a limiting block, and the end of the insertion rod away from the limiting rod is rotatably connected to a rotating rod, which is slidably connected to the limiting block.

[0009] Preferably, the dosing assembly further includes a tension rope, which is disposed on the storage tank. A tension ring is provided at the end of the tension rope away from the storage tank, and the tension ring is sleeved on the dosing nozzle.

[0010] Preferably, the adjusting component includes a pressure plate, which is horizontally disposed on a telescopic base. A first control button is disposed on the telescopic base, and the pressure plate is disposed outside the first control button. A lifting baffle is disposed on the telescopic base, and the lifting baffle is disposed outside the first aeration hole.

[0011] Preferably, the control component includes a pressing block disposed on the lower side of the medicine storage tank, and a telescopic sleeve is provided between the medicine storage tank and the telescopic base, with a second spring sleeved on the telescopic sleeve. Preferably, the control component further includes a second control button, which is provided on the telescopic base and the pressing block is positioned above the second control button.

[0012] Preferably, the inner wall of the dosing nozzle integrates a pressure sensor that is linked to the signal of the second control button.

[0013] Preferably, the graded filtration tank includes a grid unit, an inclined plate sedimentation unit, a dual-media filtration unit, and an activated carbon adsorption unit connected in series.

[0014] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) The dosing component uses the change in the reverse thrust when the dosing nozzle sprays to provide real-time feedback on the pollutant concentration of the corresponding water layer. Combined with the extension and retraction of the first spring and the tension adjustment of the tension rope, the flow rate of the sprayed agent is automatically controlled. When the pollutants in the current water layer are removed, the accumulation of the agent causes the weight of the storage component to change, which drives the whole to rise and fall to the next water layer. The switching of dosing between different water layers can be completed without manual intervention, which not only ensures the full treatment of pollutants in each water layer, but also avoids the problem of uneven treatment caused by dosing in a single water layer. (2) The graded filtration tank pre-treats the wastewater through a series of steps including grid, inclined plate sedimentation, dual-media filtration and activated carbon adsorption, which greatly reduces solid impurities and some colloids in the wastewater, laying a good water quality foundation for subsequent chemical dosing. The regulating component controls the lifting baffle to switch the aeration position, and works with the first and second aeration holes of the chemical storage component to achieve synergy between aeration and chemical dosing. This not only strengthens the mixing reaction between the chemical and the pollutants, but also accelerates the degradation of the pollutants. At the same time, the dosage is dynamically adjusted by the back thrust, avoiding the waste of chemical caused by quantitative dosing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the drug storage component of the present invention in a stretched state; Figure 3 This is a three-dimensional structural diagram of the drug storage component of the present invention in a compressed state; Figure 4 This is a top view of the drug storage component of the present invention; Figure 5 This is a schematic diagram of the bottom structure of the drug storage component of the present invention; Figure 6 This is a partial structural diagram of the drug storage component of the present invention; Figure 7 This is a schematic diagram of the side structure of the dosing nozzle of the present invention; Figure 8 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 9 for Figure 6 Enlarged structural diagram at point B.

[0016] In the diagram: 1. Wastewater tank body; 11. Staged filtration tank; 12. Chemical dosing reaction tank; 2. Drug storage assembly; 21. Drug storage tank; 22. Telescopic base; 23. Rollers; 24. Delivery pipe assembly; 25. First aeration hole; 26. Second aeration hole; 3. Dosing assembly; 31. Dosing nozzle; 32. Tensioning rope; 33. Tensioning ring; 34. Limiting rod; 35. Inserting rod; 36. First spring; 37. Limiting block; 4. Adjustment component; 41. Pressure plate; 42. First control button; 43. Lifting baffle; 5. Control components; 51. Pressing block; 52. Telescopic sleeve; 53. Second spring; 54. Second control button. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0018] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0019] like Figures 1-9 As shown, the present invention provides a multi-stage filtration treatment device for food additive production wastewater, including a wastewater tank body 1. A graded filtration tank 11 and a dosing reaction tank 12 are arranged sequentially along the water flow direction inside the wastewater tank body 1. A drug storage component 2 is arranged in the dosing reaction tank 12. A dosing component 3 is assembled at the bottom of the drug storage component 2. An adjustment component 4 for adjusting the dosing state is arranged between the drug storage component 2 and the dosing component 3. A control component 5 for controlling the amount of drug is arranged below the dosing component 3. The graded filtration tank 11 is used to remove large particulate impurities, suspended solids and some colloids from wastewater in stages, providing pretreated water quality for chemical dosing reactions; The chemical storage component 2 is used to store and transport treatment agents. It can adjust the water level according to its own weight to meet the dosing requirements of different water levels. The dosing component 3 is used to precisely spray the agent into the water and use the jet thrust to provide feedback on the pollution removal status. Adjustment component 4 is used to switch the dosing direction and aeration position according to the degree of water pollution; Control component 5 is used to adjust the spray flow rate of dosing component 3 in conjunction with the dosing component 3 to achieve dynamic control of the dosage.

[0020] Please refer to Figure 2 and Figure 3 The drug storage component 2 includes a drug storage tank 21, which is located inside the drug dosing reaction tank 12. The bottom of the drug storage tank 21 is provided with a telescopic base 22, and the telescopic base 22 is provided with rollers 23. The top of the drug storage tank 21 is provided with a delivery pipe assembly 24 for connecting external equipment. The top of the drug storage tank 21 has a first aeration hole 25 arranged in a circumferential array, and the side wall of the drug storage tank 21 has a second aeration hole 26 arranged in a circumferential array.

[0021] The storage tank 21 is a hollow, corrosion-resistant structure made of FRP material with a built-in buoyancy regulating layer. The delivery pipe assembly 24 includes a chemical delivery branch pipe, an ozone delivery branch pipe, and an aeration branch pipe. The chemical delivery branch pipe is used to deliver the chemical into the storage tank 21. The ozone delivery branch pipe is used to deliver ozone to the second aeration hole 26 for aeration of the lower water layer. The aeration branch pipe is used to deliver oxygen to the first aeration hole 25 for aeration of the upper water layer.

[0022] Please refer to Figures 3-8 The dosing assembly 3 includes a dosing nozzle 31 arranged in a circumferential array on the storage tank 21. A limiting rod 34 is provided on the storage tank 21. One end of the limiting rod 34 is inserted into a rod 35, and a first spring 36 is sleeved on the rod 35. A limiting block 37 is provided on the dosing nozzle 31. A rotating rod is rotatably connected to the end of the rod 35 away from the limiting rod 34. The rotating rod is slidably connected to the limiting block 37. The dosing assembly 3 also includes a tension rope 32, which is provided on the storage tank 21. A tension ring 33 is provided at the end of the tension rope 32 away from the storage tank 21, and the tension ring 33 is sleeved on the dosing nozzle 31.

[0023] The dosing nozzle 31 is connected to the bottom outlet of the storage tank 21 via a corrosion-resistant rubber hose, allowing it to oscillate at an angle of 0-45°. When impurities are present in the wastewater, the resistance encountered by the dosing nozzle 31 when spraying the medicine is at its maximum, and the recoil force on the dosing nozzle 31 is also at its maximum. At this time, the dosing nozzle 31 is pushed back by the recoil force to compress the first spring 36. The limiting rod 34 and the insert rod 35 are used to limit the movement direction of the dosing nozzle 31. The tension rope 32 and the tension ring 33 are in a relaxed state when the dosing nozzle 31 moves backward. When the spray volume of the dosing nozzle 31 is at its maximum, the spray rate of the dosing nozzle 31 is the same as the rate at which the dosing pipe assembly 24 delivers the dosing fluid into the storage tank 21. At this point, the storage tank 21 cannot store any more dosing fluid, and its weight remains stable. Thus, the storage tank 21 remains at the same height in the wastewater. As the dosing fluid reacts in the wastewater, impurities in this layer are gradually removed. The resistance of the dosing nozzle 31 spraying the dosing fluid decreases, and the recoil force gradually diminishes. The first spring 36 begins to rebound and reset. When the impurities in this layer of wastewater are almost removed, the first spring 36 rebounds and resets, pushing the dosing nozzle 31 out. The limiting block 37, in conjunction with the rotating rod of the insertion rod 35, restricts the movement direction of the dosing nozzle 31. At this time, the tension rope 32 and tension ring 33 are in a tensioned state, and the tension ring 33 squeezes the hose of the dosing nozzle 31. At this time, the amount of medicine sprayed by the dosing nozzle 31 decreases, and the amount of medicine delivered into the storage tank 21 by the delivery pipe assembly 24 begins to accumulate. The weight of the storage tank 21 begins to change, and the entire storage assembly 2 begins to descend. When it reaches the next layer of water to spray medicine, the resistance increases. When the dosing nozzle 31 is pushed back by the recoil force, the dosage of medicine sprayed by the dosing nozzle 31 returns to the maximum state. The entire storage assembly 2 will stay in this layer for dosing. This allows the equipment to adapt to dosing medicine in different layers of water, and automatically switch layers when the impurities in each layer of water are almost removed. This automatic layered dosing instead of single-layer dosing can increase the overall impurity removal effect and efficiency.

[0024] Please refer to Figure 3 and Figure 5 The adjusting component 4 includes a pressure plate 41, which is horizontally arranged on the telescopic base 22. A first control button 42 is provided on the telescopic base 22, and the pressure plate 41 is located outside the first control button 42. A lifting baffle 43 is provided on the telescopic base 22, and the lifting baffle 43 is located outside the first aeration hole 25.

[0025] After the medicine storage tank 21 is filled with medicine, its weight will cause the entire medicine storage assembly 2 to sink to the bottom. At this time, the roller 23 will contact the bottom of the dosing reaction tank 12. The weight of the medicine storage tank 21 will then compress the control assembly 5, causing the medicine storage tank 21 to descend a certain distance. Part of the medicine storage tank 21 will be retracted into the telescopic base 22. At this time, the entire medicine storage tank 21 will descend, while one side of the telescopic base 22's lifting baffle 43 will be raised, and the other side of the telescopic base 22 will be lowered and retracted. When the medicine storage tank 21 descends, the second aeration hole 26 on the side of the raised baffle will be blocked. When it is at the bottom of the tank... The second aeration hole 26 outputs ozone for aeration. Since the ozone is only output through the second aeration hole 26 on one side, the ozone will generate thrust to push the entire drug storage component 2 forward. The first aeration hole 25 also faces upward for aeration. By repositioning the entire equipment to aerate in different places, the reaction rate of the drug inside the dosing reaction tank 12 is accelerated. When the entire equipment reaches the edge of the dosing reaction tank 12, the pressure plate 41 on this side is pressed down and squeezes the first control button 42. At this time, the lifting baffle 43 switches, and the second aeration hole 26 near the edge of the tank starts aeration, driving the entire equipment to move in the opposite direction.

[0026] Please refer to Figure 9 The control component 5 includes a pressing block 51, which is located on the lower side of the medicine storage tank 21. A telescopic sleeve 52 is provided between the medicine storage tank 21 and the telescopic base 22. A second spring 53 is sleeved on the telescopic sleeve 52. The control component 5 also includes a second control button 54, which is provided on the telescopic base 22. The pressing block 51 is located above the second control button 54. A pressure sensor integrated on the inner wall of the dosing nozzle 31 is linked to the signal of the second control button 54. The rubber hose is elastic and can be adjusted according to the change of the counter-thrust.

[0027] A solenoid valve is installed inside the drug delivery branch pipe. The second control button 54 is electrically connected to the solenoid valve. When the drug storage tank 21 is at the bottom of the pool, the drug storage tank 21 descends, causing the lower pressure block 51 to descend. The second spring 53 and the telescopic sleeve 52 are in a compressed state. The lower pressure block 51 presses down on the second control button 54. At this time, the second control button 54 transmits an electrical signal to the solenoid valve. However, the solenoid valve is not yet closed. A pressure sensor is installed on the drug dosing nozzle 31. When the impurities in the bottom water are almost removed, the recoil force received by the drug dosing nozzle 31 decreases. The pressure sensor receives a lower pressure signal and transmits a signal to the solenoid valve. The solenoid valve closes. At this time, the delivery pipe assembly 24 no longer delivers drugs into the drug storage tank 21. As the output of drugs from the drug storage tank 21 decreases, the entire drug storage assembly 2 begins to float and rise. When it reaches the top of the pool, all the drugs have been delivered, and the drug dosing stops.

[0028] Please refer to Figure 1The graded filtration tank 11 includes a grid unit, an inclined plate sedimentation unit, a dual-media filtration unit and an activated carbon adsorption unit connected in series.

[0029] The grid unit is equipped with stainless steel bars spaced 5-10mm apart to intercept large particles of residue; the inclined plate sedimentation unit is equipped with PVC inclined plates at a 60° angle with a plate spacing of 80-100mm to accelerate the settling of suspended solids; the dual-media filtration unit is laid from top to bottom with anthracite coal layer (particle size 1.2-2.0mm, thickness 400-500mm) and quartz sand layer (particle size 0.5-1.0mm, thickness 600-800mm) to finely filter out small impurities; the activated carbon adsorption unit is laid with a granular activated carbon layer (iodine value ≥800mg / g, thickness 1000-1500mm) to adsorb trace organic matter and color.

[0030] The working principle and usage process of this invention: Multi-stage filtration stage: Wastewater from food additive production first enters the graded filtration tank 11, and then passes through the grid unit to intercept large particles of residue, the inclined plate sedimentation unit to settle suspended solids and colloids, the dual-media filtration unit to finely filter fine impurities, and the activated carbon adsorption unit to adsorb trace organic matter and color. The pretreated wastewater then enters the dosing reaction tank 12. Upper water dosing: Initially, the liquid level in the storage component 2 is low, and the buoyancy is greater than the gravity, so it floats on the upper layer of the dosing reaction tank 12. The lifting baffle 43 descends to block the first aeration hole 25, and ozone is sprayed out from the second aeration hole 26, which, together with the aeration, disperses the floating matter on the upper layer. The delivery pipe group 24 delivers the medicine to the storage tank 21, and the dosing nozzle 31 sprays the medicine. At this time, the concentration of floating matter is high, the water resistance is large, and the back thrust is large. The pressure sensor feeds back a signal to the control component 5 to maintain a large amount of medicine spray. As the floating matter reacts with the medicine, the water resistance decreases and the back thrust decreases. The dosing nozzle 31 pulls the tension rope 32, and the insertion rod 35 triggers the control component 5. The medicine delivery slows down, the liquid level in the storage tank 21 rises, the weight increases, and it gradually sinks. Dosing in the lower water layer: The storage component 2 sinks to the bottom of the pool, the roller 23 contacts the bottom of the pool, the telescopic base 22 is compressed, the pressure plate 41 triggers the first control button 42, the lifting baffle 43 rises to block the second aeration hole 26, and ozone is sprayed out from the first aeration hole 25 to disturb the lower sediment; at this time, the lower particle concentration is high and the water resistance is large, and the back thrust increases again, and the control component 5 increases the dosage in conjunction; as the particles are removed by reaction, the water resistance decreases and the back thrust decreases, the dosing nozzle 31 resets, the control component 5 shuts off the agent delivery, the agent in the storage tank 21 continues to spray, the liquid level decreases, the buoyancy is restored, and the storage component 2 floats up and resets; Sludge removal and compliant discharge: The sediment generated by the chemical reaction settles into the conical sludge hopper at the bottom of the chemical reaction tank 12. The control component 5 is activated to open the solenoid valve of the sludge discharge pipe to discharge the sludge. After treatment, the wastewater meets the standards and overflows from the top of the chemical reaction tank 12 or enters the reuse treatment unit.

[0031] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A multi-stage filtering treatment device for food additive production wastewater, comprising a wastewater pool body (1), characterized in that: The wastewater tank body (1) is sequentially provided with a staged filtering tank (11) and a dosing reaction tank (12) inside along the water flow direction, the dosing reaction tank (12) is provided with a medicine storage assembly (2), the bottom of the medicine storage assembly (2) is assembled with a dosing assembly (3), an adjusting assembly (4) for adjusting the dosing state is arranged between the medicine storage assembly (2) and the dosing assembly (3), and a control assembly (5) for controlling the medicine amount is arranged below the dosing assembly (3); The staged filtering tank (11) is used for removing large-particle impurities, suspended solids and part of colloids in wastewater step by step, and providing pretreated water quality for dosing reaction; The medicine storage assembly (2) is used for storing and conveying treatment medicine, and can realize water layer lifting according to the weight change, and adapt to different water layer dosing requirements; The dosing assembly (3) is used for accurately spraying medicine into water, and feedbacks the pollution removal condition through the spray reverse thrust; The adjusting assembly (4) is used for switching the dosing direction and the aeration position according to the water layer pollution degree; The control assembly (5) is used for linkage adjusting the spray flow of the dosing assembly (3), and realizing dynamic control of the medicine amount.

2. The multi-stage filtering device for food additive production wastewater treatment according to claim 1, characterized in that: The medicine storage assembly (2) comprises a medicine storage tank (21), the medicine storage tank (21) is arranged inside the dosing reaction tank (12), the bottom of the medicine storage tank (21) is provided with a telescopic base (22), the telescopic base (22) is provided with a roller (23), the top end of the medicine storage tank (21) is provided with a conveying pipe group (24) for connecting external equipment, the top of the medicine storage tank (21) is circularly arrayed and provided with first aeration holes (25), and the side wall of the medicine storage tank (21) is circularly arrayed and provided with second aeration holes (26).

3. The multi-stage filtering device for food additive production wastewater treatment according to claim 1, characterized in that: The dosing assembly (3) comprises a dosing nozzle (31), the dosing nozzle (31) is circularly arranged on the medicine storage tank (21), the medicine storage tank (21) is provided with a limiting rod (34), one end of the limiting rod (34) is inserted with a plug rod (35), and the plug rod (35) is sleeved with a first spring (36).

4. The multi-stage filtering device for food additive production wastewater treatment according to claim 3, characterized in that: The dosing nozzle (31) is provided with a limiting block (37), the end of the plug rod (35) away from the limiting rod (34) is rotationally connected with a rotating rod, and the rotating rod is slidingly connected with the limiting block (37).

5. The multi-stage filtering device for food additive production wastewater treatment according to claim 4, characterized in that: The dosing assembly (3) further comprises a tensioning rope (32), the tensioning rope (32) is arranged on the medicine storage tank (21), and the end of the tensioning rope (32) away from the medicine storage tank (21) is provided with a tensioning ring (33), and the tensioning ring (33) is sleeved on the dosing nozzle (31).

6. The multi-stage filtering device for food additive production wastewater treatment according to claim 3, characterized in that: The adjusting assembly (4) comprises a pressing plate (41), the pressing plate (41) is horizontally arranged on the telescopic base (22), the telescopic base (22) is provided with a first control button (42), the pressing plate (41) is arranged outside the first control button (42), the telescopic base (22) is provided with a lifting baffle (43), and the lifting baffle (43) is arranged outside the first aeration hole (25).

7. The multi-stage filtering device for food additive production wastewater treatment according to claim 6, characterized in that: The control assembly (5) comprises a lower pressing block (51) arranged at the lower side of a medicine storage tank (21), a telescopic sleeve rod (52) arranged between the medicine storage tank (21) and a telescopic base (22), and a second spring (53) sleeved on the telescopic sleeve rod (52).

8. The multi-stage filtering device for food additive production wastewater treatment according to claim 7, characterized in that: The control assembly (5) further comprises a second control button (54), and the telescopic base (22) is provided with the second control button (54), and the lower pressing block (51) is arranged above the second control button (54).

9. The multi-stage filtering device for food additive production wastewater treatment according to claim 8, characterized in that: A pressure sensor is integrated on the inner wall of the medicine injection nozzle (31) and is signal-linked with the second control button (54).

10. The multi-stage filtering device for food additive production wastewater treatment according to claim 1, characterized in that: The grading filter tank (11) comprises a grating unit, an inclined plate sedimentation unit, a double medium filtration unit and an activated carbon adsorption unit which are sequentially connected in series.

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