Tanning wastewater recycling equipment with hair filtering function and working method of tanning wastewater recycling equipment

Abstract

The invention discloses tannery wastewater recycling equipment with a hair filtering function and a working method of the tannery wastewater recycling equipment, and relates to the technical field of tannery wastewater treatment equipment.The tannery wastewater recycling equipment comprises a reaction tank, the interior of the reaction tank is divided into four sections which are sequentially communicated, and a premixing tank is additionally erected in the reaction tank; a feeding mechanism for introducing tannery wastewater is arranged in the premixing tank; a chemical feeding mechanism for introducing a treatment chemical is arranged on the outer side of the feeding mechanism, and the chemical feeding mechanism comprises a stand erected at the top of the premixing tank; an impurity removal mechanism for filtering hair is arranged in the middle of the feeding mechanism; the feeding mechanism is matched with the chemical feeding mechanism, so that the reaction time of wastewater and chemicals entering the reaction tank is prolonged, and meanwhile, the impurity removal mechanism is used for removing impurity hairs doped in the wastewater. The tannery wastewater recycling equipment with the hair filtering function and the working method of the tannery wastewater recycling equipment have the effects of high stability and high operation efficiency.

Description

Technical Field

[0001] This invention relates to the field of leather wastewater treatment equipment, and in particular to a leather wastewater recycling device with a filter function and its working method. Background Technology

[0002] In the leather tanning process, steps such as soaking, hair removal, and liming generate large amounts of wastewater containing hair, lime, protein, grease, and chemical reagents. This type of wastewater has a complex composition and a high concentration of suspended solids, especially a large amount of short, fine fibers, making it difficult to treat.

[0003] Currently, most tanneries focus on end-of-pipe integrated treatment for wastewater, but the reuse rate is low. Some processes that attempt to recycle wastewater often suffer from problems such as insufficient mixing of chemicals in the early stages and incomplete removal of solid impurities (especially hair), leading to pipe blockage, increased load on subsequent treatment, and unstable quality of recycled water. These issues seriously affect the long-term stable operation of the recycling system and the quality of recycled water. Therefore, developing a specialized device that can efficiently pre-treat, effectively remove impurities, and safely recycle wastewater within the tanning process is of great significance for energy conservation, emission reduction, and cleaner production in the tanning industry. Summary of the Invention

[0004] This invention discloses a leather tanning wastewater recycling device with a filter function and its working method, aiming to address the technical problem that existing leather tanning wastewater treatment equipment needs to improve in terms of reaction efficiency and impurity removal efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A leather tanning wastewater recycling device with a filtration function includes a reaction tank, the interior of which is divided into four interconnected sections. An additional premixing tank is also constructed inside the reaction tank. The premixing tank is equipped with a feeding mechanism for introducing leather tanning wastewater. The feeding mechanism includes a straight feeding pipe extending from the outside of the reaction tank into the premixing tank. A spiral riser is fixedly connected to the end of the straight feeding pipe. Several inclined branch pipes are connected through the bottom of the spiral riser, and a material cylinder is connected through the side of each branch pipe. A filter plate is fixedly inclined inside the material cylinder, extending into the interior of the branch pipe. An inlet mechanism for introducing treatment agents is provided on the outside of the feeding mechanism, and the inlet mechanism includes a frame mounted on the top of the premixing tank. The feeding mechanism is provided with a filter removal mechanism in the middle. The filter removal mechanism includes a sleeve that is connected to the end of the spiral riser. An inner liner is installed inside the sleeve. A filter cover is provided on one side of the inner liner. The top of the filter cover extends through the middle of the frame. A cleaning component is slidably installed on the outside of the filter cover. The feeding mechanism, in conjunction with the drug feeding mechanism, increases the reaction time of wastewater and reagents entering the reaction tank, while the impurity removal mechanism removes impurities and hairs mixed in with the wastewater.

[0006] By further incorporating feeding and chemical feeding mechanisms into existing tanning wastewater treatment technologies, and adding a premixing tank inside the reaction tank, the wastewater and chemicals introduced into the reaction tank are premixed. Simultaneously, the feeding and chemical feeding mechanisms can increase the mixing time of wastewater and chemicals through flow control and turbulence, allowing the fully reacted wastewater to then enter the reaction tank through the premixing tank. This significantly improves the mixing time and efficiency during the initial wastewater treatment. Furthermore, the additional impurity removal mechanism works in conjunction with the feeding mechanism to intercept all impurities mixed in the wastewater, thus maintaining the long-term stable operation of the circulation system and the quality of water reuse. This significantly improves the working efficiency and long-term stability of traditional tanning wastewater circulation equipment.

[0007] In a preferred embodiment, the spiral riser is installed on top of the premixing tank, and the inclination angles of the several branch pipes are the same. At the same time, the height of each spiral segment of the spiral riser is different in the vertical direction, resulting in different water depths for each layer of the branch pipe.

[0008] By installing a spiral riser structure at the top of the premixing tank and connecting it to the feed straight pipe, the spiral structure extends the travel distance of the wastewater. Additional branch pipes at the bottom of the spiral riser divert the wastewater and filter it using filter plates, thereby reducing the operating pressure of the impurity removal mechanism. Simultaneously, the spiral riser causes the wastewater entering the premixing tank to impact at a specified angle, creating eddies within the tank. This controlled flow and turbulence increases the mixing time between the wastewater and the chemicals, allowing the fully reacted wastewater to then pass through the premixing tank into the reaction tank, significantly improving the mixing time and efficiency during the initial wastewater treatment.

[0009] In a preferred embodiment, a medicine tank is fixedly installed on the top of the platform, and a medicine inlet spiral pipe is installed at the bottom of the premixing tank. A connecting pipe is connected between the medicine inlet spiral pipe and the medicine tank, and the connecting pipe passes through the middle of the platform.

[0010] By installing a drug inlet spiral pipe structure at the bottom of the premixing tank, which is connected to the drug tank via a connecting pipe, the drug located inside the drug tank is evenly introduced into the premixing tank. Combined with the vortex wastewater inside the premixing tank, the drug and wastewater are evenly mixed, thereby greatly improving the mixing efficiency of the wastewater in the early stage.

[0011] In a preferred embodiment, an electric push rod is mounted on the top of the platform, the output end of the electric push rod is vertically fixed to the top of the cleaning component, and a paddle is rotatably mounted on the bottom of the sleeve.

[0012] By additionally setting a through-connected sleeve and inner tank structure at the end of the spiral riser, the wastewater flowing from the end of the spiral riser will flow through the filter cover on the side of the inner tank. The filter cover will intercept impurities in the wastewater, and the cleaning component structure driven by the electric push rod will move vertically along the surface of the filter cover, and carry the impurities adhering to the surface of the filter cover out from the premixing tank, thereby maintaining the long-term stable operation of the circulation system and the quality of water reuse, and greatly improving the working efficiency and long-term stability of traditional leather wastewater circulation equipment.

[0013] A method for recycling tanning wastewater with a wool-filtering function includes the following steps; S1: Before the equipment is put into operation, the four compartments of the reaction tank are sequentially filled with decolorizing solution, flocculant solution, alkaline pH adjustment solution and polyacrylamide solution, and the feeding mechanism is connected to the external wastewater conveying equipment. S2: An external wastewater conveying device introduces tanning wastewater into the premixing tank in a spiral shape through the feeding mechanism. At the same time, the chemical injection mechanism sprays the chemical agent evenly from the bottom of the premixing tank in a spiral shape, so that the turbulent tanning wastewater and the chemical agent can fully react inside the premixing tank. S3: The synchronously operating impurity removal mechanism continuously removes impurities and hairs from the inside of the premixing tank in the tanning wastewater; S4: The treated tannery wastewater flows sequentially through the four sections of the reaction tank. First, it reacts with a decolorizing solution to reduce the color of the wastewater and improve the wastewater treatment efficiency. Then, it reacts with a flocculant solution to flocculate impurities and improve the purity of the wastewater. Next, it reacts with an alkaline pH adjustment solution to enhance the biodegradability of microorganisms in the water. Finally, it reacts with a polyacrylamide solution to further improve the wastewater treatment efficiency. S5: Wastewater that has undergone multiple treatment processes is discharged through an external pump and recycled.

[0014] As can be seen from the above, the leather tanning wastewater recycling equipment and its working method provided by the present invention have the following technical effects.

[0015] Firstly, based on existing tanning wastewater treatment technology, a premixing tank structure is further installed inside the reaction tank. A spiral riser connected to the feed straight pipe extends the wastewater's travel distance, and a branch pipe at the bottom of the spiral riser diverts the wastewater, causing it to impact at a specified angle and creating eddies within the premixing tank. Simultaneously, the medicine located inside the medicine tank is evenly introduced into the premixing tank through the medicine inlet spiral pipe. Combined with the eddy wastewater within the premixing tank, this controlled flow and turbulence increase the mixing time between wastewater and medicine. The fully reacted wastewater then enters the reaction tank through the premixing tank, significantly improving the mixing time and efficiency during the initial wastewater treatment.

[0016] Secondly, by additionally setting a through-connected sleeve and inner tank structure at the end of the spiral riser, the wastewater flowing from the end of the spiral riser will flow through the filter cover on the side of the inner tank. The filter cover will intercept impurities in the wastewater, and the cleaning component structure driven by the electric push rod will move vertically along the surface of the filter cover, and carry the impurities adhering to the surface of the filter cover out from the premixing tank. Meanwhile, the filter plates additionally set inside the branch pipe will operate synchronously, thereby reducing the operating pressure of the impurity removal mechanism, maintaining the long-term stable operation of the circulation system and the quality of water reuse, and greatly improving the working efficiency and long-term stability of traditional leather wastewater circulation equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure proposed in this invention.

[0018] Figure 2 This is a schematic diagram of the premixing tank structure proposed in this invention.

[0019] Figure 3 This is a schematic diagram of the internal structure of the premixing tank proposed in this invention.

[0020] Figure 4 This is an exploded view of the internal structure of the premixing tank proposed in this invention.

[0021] Figure 5 This is a schematic diagram of the feeding mechanism proposed in this invention.

[0022] Figure 6 This is a cross-sectional view of the branch pipe structure proposed in this invention.

[0023] Figure 7 This is an exploded view of the impurity removal mechanism proposed in this invention.

[0024] Figure 8 This is a schematic diagram of the cleaning component structure proposed in this invention.

[0025] In the diagram: 1. Reaction tank; 2. Premixing tank; 201. Grid window; 3. Feeding mechanism; 301. Feeding straight pipe; 302. Spiral riser; 3021. Feed inlet; 303. Branch pipe; 304. Material cylinder; 3041. Back plate; 305. Filter plate; 4. Drug feeding mechanism; 401. Stand; 402. Drug tank; 403. Drug feeding spiral pipe; 404. Connecting pipe; 5. Impurity removal mechanism; 501. Sleeve; 502. Inner liner; 503. Filter cover; 5031. Drain outlet; 504. Cleaning component; 5041. Combing component; 5042. Support; 5043. Comb teeth; 505. Electric push rod; 506. Paddle. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] The invention discloses a leather tanning wastewater recycling device with a filter function and its working method, which is mainly applied to the scenario of recycling leather tanning wastewater.

[0028] Reference Figures 1 to 8 A leather tanning wastewater recycling device with a filter function includes a reaction tank 1. The interior of the reaction tank 1 is divided into four sections that are connected in sequence. A premixing tank 2 is also additionally installed inside the reaction tank 1. The premixing tank 2 is equipped with a feeding mechanism 3 for introducing leather tanning wastewater. The feeding mechanism 3 includes a straight feeding pipe 301 that is inserted into the premixing tank 2 from the outside of the reaction tank 1. A spiral riser 302 is fixedly connected to the end of the straight feeding pipe 301. Several inclined branch pipes 303 are connected through the bottom of the spiral riser 302. A material cylinder 304 is connected through the side of each branch pipe 303. A filter plate 305 is fixedly inclined inside the material cylinder 304 and extends into the interior of the branch pipe 303. An inlet mechanism 4 for introducing treatment agents is provided on the outside of the feeding mechanism 3. The inlet mechanism 4 includes a platform 401 mounted on the top of the premixing tank 2. The feeding mechanism 3 is provided with a filter removal mechanism 5 in the middle. The filter removal mechanism 5 includes a sleeve 501 that is connected to the end of the spiral riser 302. The sleeve 501 is equipped with an inner liner 502. A filter cover 503 is provided on one side of the inner liner 502. The top of the filter cover 503 extends through the middle of the frame 401, and a cleaning component 504 is slidably installed on the outside of the filter cover 503. The feeding mechanism 3, in conjunction with the drug feeding mechanism 4, increases the reaction time of the wastewater and the reagents entering the reaction tank 1. At the same time, the impurity removal mechanism 5 removes impurities mixed in with the wastewater.

[0029] In this embodiment: an external wastewater conveying device introduces tanning wastewater into the premixing tank 2 in a spiral shape through the feeding mechanism 3. At the same time, the chemical injection mechanism 4 sprays the chemical agent evenly from the bottom of the premixing tank 2 in a spiral shape, creating turbulence. The tanning wastewater and the chemical agent react fully inside the premixing tank 2. Meanwhile, the impurity removal mechanism 5 continuously removes impurities and hairs from the tanning wastewater from the inside of the premixing tank 2. The treated tanning wastewater then flows from the premixing tank 2 into the reaction tank 1, passing through the four sections of the reaction tank 1 in sequence. First, it reacts with the decolorizing solution to reduce the color of the wastewater and improve the wastewater treatment efficiency. Then, it reacts with the flocculant solution to flocculate impurities and improve the purity of the wastewater. Next, it reacts with the alkaline pH adjustment solution to improve the biodegradability of microorganisms in the water. Finally, it reacts with the polyacrylamide solution to further improve the wastewater treatment efficiency. After completing multiple treatment processes, the wastewater is discharged through an external pump and recycled.

[0030] The premixing tank 2 has symmetrical grid windows 201 on both sides of its bottom, with the grid windows 201 facing the inside of the reaction tank 1, for introducing the mixed wastewater into the interior of the reaction tank 1.

[0031] Reference Figures 1 to 6 In a preferred embodiment, the spiral riser 302 is installed on the top of the premixing tank 2, and the inclination angle of the several branch pipes 303 is the same. At the same time, the height of each spiral segment of the spiral riser 302 in the vertical direction is different, resulting in different water depths for each branch pipe 303.

[0032] An external wastewater conveying device introduces tanning wastewater into the spiral riser 302 through the feed straight pipe 301, causing the tanning wastewater to move in a spiral shape along the spiral riser 302 and into the premixing tank 2. During the movement, some wastewater will be sprayed into the premixing tank 2 through the inclined branch pipe 303, impacting the wastewater inside the premixing tank 2 and causing the wastewater in the premixing tank 2 to generate eddies. At the same time, the wastewater flowing from the branch pipe 303 will be filtered by the filter plate 305 inside the material cylinder 304, thereby intercepting and storing impurities inside the material cylinder 304.

[0033] Each material cylinder 304 has a back plate 3041 fixed to its end by bolts, which makes it convenient for workers to disassemble the material cylinder 304 and clean the filter plates 305 inside regularly.

[0034] Reference Figures 2 to 4 In a preferred embodiment, a medicine tank 402 is fixedly installed on the top of the stand 401, and a medicine inlet spiral pipe 403 is installed at the bottom of the premixing tank 2. A connecting pipe 404 is connected between the medicine inlet spiral pipe 403 and the medicine tank 402, and the connecting pipe 404 passes through the middle of the stand 401.

[0035] The medicine tank 402 uses a built-in pump to introduce the medicine from the connecting pipe 404 into the inside of the medicine inlet spiral tube 403, and sprays it out evenly from the top of the medicine inlet spiral tube 403. At the same time, it mixes and blends with the wastewater in the premixing tank 2.

[0036] Reference Figures 2 to 4 , Figures 7 to 8 In a preferred embodiment, an electric push rod 505 is mounted on the top of the platform 401, the output end of the electric push rod 505 is vertically fixed to the top of the cleaning component 504, and a paddle 506 is rotatably mounted on the bottom of the sleeve 501.

[0037] Some of the wastewater located inside the spiral riser 302 flows out through the branch pipe 303, while most of the wastewater continues to flow towards the end of the spiral riser 302 and flows into the premixing tank 2 from the side of the inner liner 502 inside the sleeve 501. At the same time, it is filtered by the filter cover 503. Impurities are intercepted by the filter cover 503 and located inside the inner liner 502. At this time, the electric push rod 505 reciprocates by extending and retracting its output shaft, thereby driving the cleaning component 504 to move vertically along the outside of the filter cover 503. When the cleaning component 504 moves downward, it does not work, while when it moves upward, it carries the impurities out from the top of the filter cover 503, thus completing the removal of impurities from the wastewater.

[0038] The cleaning component 504 includes a combing component 5041 distributed on the outside of the filter cover 503. A bracket 5042 is fixedly installed on the top of the combing component 5041. The bracket 5042 is fixedly installed at the bottom of the output shaft of the electric push rod 505. The combing component 5041 has several evenly distributed comb teeth 5043 that rotate in one direction. The comb teeth 5043 are slidably inserted into the inside of the filter cover 503. The electric push rod 505 drives the combing component 5041 to move vertically through the bracket 5042. When the combing component 5041 moves downward, it will use resistance to push the comb teeth 5043 to rotate upward, thus not working. When the cleaning component 504 moves upward, it will drive the comb teeth 5043 to insert horizontally into the inside of the filter cover 503 and scrape the impurities from the top of the filter cover 503, thereby completing the removal of impurities from the wastewater.

[0039] Furthermore, the spiral riser 302 has an inlet 3021 at its end. The inlet 3021 is connected to the inside of the sleeve 501 and the inner liner 502, and faces the blade 506. The wastewater sprayed through the inlet 3021 will impact the blade 506, causing the blade 506 to rotate. The rotation direction of the blade 506 is opposite to the direction of the vortex inside the premixing tank 2, thereby generating a turbulence effect and promoting the mixing of wastewater and drugs.

[0040] Specifically, the top of the filter cover 503 is provided with a drain port 5031, which is located on the top of the frame 401 and is used in conjunction with the cleaning component 504 to remove dirt from inside the filter cover 503.

[0041] Working Principle: During operation, an external wastewater conveying device introduces tanning wastewater into the spiral riser 302 through the feed straight pipe 301. This causes the wastewater to move in a spiral shape along the spiral riser 302 and into the premixing tank 2. During this movement, some wastewater is sprayed into the premixing tank 2 through the inclined branch pipe 303, impacting the wastewater inside the premixing tank 2 and creating a vortex. Simultaneously, the wastewater flowing from the branch pipe 303 is filtered by the filter plate 305 inside the material cylinder 304, thus trapping and storing impurities inside the material cylinder 304. Meanwhile, the medicine tank 402, through a built-in pump, introduces medicine from the connecting pipe 404 into the medicine inlet spiral pipe 403, and sprays it evenly from the top of the medicine inlet spiral pipe 403. The wastewater inside the premixing tank 2 is mixed thoroughly by vortexing. The uniformly mixed wastewater then enters the interior of the reaction tank 1. Some of the wastewater located inside the spiral riser 302 flows out from the branch pipe 303. Most of the wastewater continues to flow towards the end of the spiral riser 302 and flows into the premixing tank 2 from the side of the inner liner 502 inside the sleeve 501. At the same time, it is filtered by the filter cover 503. Impurities are intercepted by the filter cover 503 and located inside the inner liner 502. At this time, the electric push rod 505 reciprocates by extending and retracting its output shaft, thereby driving the cleaning component 504 to move vertically along the outside of the filter cover 503. When moving downward, the cleaning component 504 does not work, while when moving upward, the cleaning component 504 carries the impurities out from the top of the filter cover 503, thus completing the removal of impurities from the wastewater.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A leather tanning wastewater recycling device with a wool-filtering function, comprising a reaction tank (1), wherein the interior of the reaction tank (1) is divided into four sections connected in sequence, characterized in that, Inside the reaction tank (1), a premixing tank (2) is additionally constructed. Inside the premixing tank (2), a feeding mechanism (3) for introducing tannery wastewater is provided. The feeding mechanism (3) includes a feeding straight pipe (301) that is inserted into the premixing tank (2) from the outside of the reaction tank (1). The end of the feeding straight pipe (301) is connected to a spiral riser (302). The bottom of the spiral riser (302) is connected to several inclined branch pipes (303). Each branch pipe (303) is connected to a material cylinder (304) on its side. Inside the material cylinder (304), a filter plate (305) is inclinedly fixed. The filter plate (305) extends into the interior of the branch pipe (303). The outside of the feeding mechanism (3) is provided with a drug feeding mechanism (4) for introducing treatment agents. The drug feeding mechanism (4) includes a frame (401) mounted on the top of the premixing tank (2). The feeding mechanism (3) is provided with a filter removal mechanism (5) in the middle. The filter removal mechanism (5) includes a sleeve (501) that is connected to the end of the spiral riser (302). An inner liner (502) is installed inside the sleeve (501). A filter cover (503) is provided on one side of the inner liner (502). The top of the filter cover (503) extends through the middle of the frame (401), and a cleaning component (504) is slidably installed on the outside of the filter cover (503). The feeding mechanism (3) is used in conjunction with the drug feeding mechanism (4) to increase the reaction time of wastewater and reagents entering the reaction tank (1), while the impurity removal mechanism (5) removes impurities mixed in with the wastewater.

2. The leather tanning wastewater recycling equipment with a wool-filtering function according to claim 1, characterized in that, The spiral riser (302) is installed on the top of the premixing tank (2). Several branch pipes (303) have the same inclination angle. At the same time, the height of each spiral segment of the spiral riser (302) in the vertical direction is different, resulting in different water depths for each layer of branch pipes (303).

3. The leather tanning wastewater recycling equipment with a wool-filtering function according to claim 1, characterized in that, A medicine tank (402) is fixedly installed on the top of the stand (401), and a medicine inlet spiral pipe (403) is installed at the bottom of the premixing tank (2). A connecting pipe (404) is connected between the medicine inlet spiral pipe (403) and the medicine tank (402), and the connecting pipe (404) passes through the middle of the stand (401).

4. The leather tanning wastewater recycling equipment with a wool-filtering function according to claim 1, characterized in that, An electric push rod (505) is mounted on the top of the platform (401). The output end of the electric push rod (505) is vertically fixed to the top of the cleaning component (504). A paddle (506) is rotatably mounted on the bottom of the sleeve (501).

5. A leather tanning wastewater recycling device with a wool-filtering function according to claim 4, characterized in that, The cleaning component (504) includes a combing component (5041) distributed on the outside of the filter cover (503). A bracket (5042) is fixedly installed on the top of the combing component (5041). The bracket (5042) is fixedly installed on the bottom of the output shaft of the electric push rod (505). The combing component (5041) has a number of evenly distributed comb teeth (5043) that rotate in one direction. The comb teeth (5043) are slidably inserted into the inside of the filter cover (503).

6. A leather tanning wastewater recycling device with a wool-filtering function according to claim 1, characterized in that, The premixed tank (2) has symmetrical grid windows (201) on both sides of its bottom, and the grid windows (201) face the inside of the reaction tank (1).

7. A leather tanning wastewater recycling device with a wool-filtering function according to claim 4, characterized in that, The spiral riser (302) has a feed inlet (3021) at its end. The feed inlet (3021) is connected to the inside of the sleeve (501) and the inner liner (502) and faces the blade (506).

8. A leather tanning wastewater recycling device with a wool-filtering function according to claim 1, characterized in that, Each of the aforementioned barrels (304) has a back plate (3041) bolted to its end.

9. A leather tanning wastewater recycling device with a wool-filtering function according to claim 1, characterized in that, The filter cover (503) has a drain port (5031) on its top, and the drain port (5031) is located on the top of the frame (401).

10. The method for recycling tanning wastewater with a wool-filtering function according to claim 1, characterized in that, Includes the following steps; S1: Before the equipment is put into operation, the four compartments of the reaction tank (1) are filled with decolorizing solution, flocculant solution, alkaline pH adjustment solution and polyacrylamide solution in sequence. At the same time, the feeding mechanism (3) is connected to the external wastewater conveying equipment. S2: The external wastewater conveying equipment introduces the tanning wastewater into the premixing tank (2) in a spiral shape through the feeding mechanism (3), while the drug feeding mechanism (4) sprays the drug out evenly from the bottom of the premixing tank (2) in a spiral shape, so that the turbulent tanning wastewater and the drug react fully inside the premixing tank (2). S3: The synchronously operating impurity removal mechanism (5) continuously removes impurities and hairs from the inside of the premixing tank (2) in the tanning wastewater; S4: The treated tannery wastewater flows sequentially through the four sections of the reaction tank (1), first reacting with the decolorizing solution to reduce the color of the wastewater and improve the wastewater treatment efficiency, then reacting with the flocculant solution to flocculate impurities and improve the purity of the wastewater, then reacting with the alkaline pH adjustment solution to improve the biodegradability of microorganisms in the water, and finally reacting with the polyacrylamide solution to further improve the wastewater treatment efficiency. S5: Wastewater that has undergone multiple treatment processes is discharged through an external pump and recycled.

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