A leather sewage emission reduction treatment device

Abstract

This invention discloses a leather wastewater reduction and treatment device, comprising a tank containing, from left to right, a coagulation tank, an aeration tank, a flotation tank, a sludge collection tank, and a clear water tank. The upper part of the flotation tank is equipped with a scraper and a chain scraping mechanism that drives its rotation. The bottom of the flotation tank is equipped with an aeration pipe and a driving mechanism that enables the aeration pipe to move horizontally reciprocatingly. The aeration pipe is in close contact with the bottom surface of the flotation tank. This invention solves the problem of siltation caused by long-term operation of the flotation tank bottom by setting a reciprocating airflow crushing mechanism at the bottom of the flotation tank, ensuring continuous and high-efficiency wastewater treatment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a leather wastewater reduction and treatment device. Background Technology

[0002] Leather wastewater has a wide variety of complex components, especially containing soluble proteins, dander, grease (animal fat), tannins (vegetable tanning agents), lignin, blood, meat scraps, and fecal matter. It needs to be pretreated before oxidation treatment, and must pass through processes such as screens, coagulation, and flotation before it can be biochemically treated. In practical applications, coagulation and flotation processes are often combined. The treatment structure, as disclosed in patent number 202121145155.6, involves adding chemicals to settle suspended colloids. The upper layer of clear water flows into the flotation tank for further treatment. The flotation tank contains numerous microbubbles that adsorb suspended particles, emulsified oil droplets, and other pollutants. These are then collected by a scraper mechanism, and the lower layer of clear water flows into subsequent processes. However, the water flowing from the coagulation tank into the flotation tank may contain a small amount of large colloid particles that cannot be collected by the flotation process. These particles eventually fall to the bottom of the flotation tank and are discharged into subsequent processes via the water inlet pipe, causing blockages. The current solution is to shut down the system for cleaning every six months, but this shutdown severely impacts wastewater treatment efficiency, necessitating a solution to ensure continuous wastewater treatment. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a leather wastewater reduction and treatment device to solve the problem of reduced wastewater treatment efficiency caused by the accumulation of large colloidal particles at the bottom of the tank due to the air flotation process in the prior art.

[0004] The objective of this invention is achieved through the following technical solution: a leather wastewater reduction and treatment device, comprising a tank, wherein a coagulation tank, an aeration tank, a flotation tank, a sludge collection tank, and a clear water tank are arranged sequentially from left to right inside the tank. The upper part of the flotation tank is provided with a sludge scraper and a chain scraping mechanism that drives its rotation. The bottom of the flotation tank is provided with an aeration pipe and a driving mechanism that enables the aeration pipe to move horizontally back and forth. The aeration pipe is in close contact with the bottom surface of the flotation tank.

[0005] Preferably, a plurality of crushing mechanisms are connected to the lower part of the aeration pipe. Each crushing mechanism includes a shell and a Laval tube. The lower end of the shell is sealed and connected to the upper end of the Laval tube. The Laval tube has a liquid inlet at its narrow throat.

[0006] Preferably, a first support plate is provided inside the housing, the first support plate is provided with a first vent hole, a rotating shaft is provided inside the housing, one end of the rotating shaft is rotatably connected to the first support plate, the lower part of the rotating shaft extends to the lower part of the Laval tube, an impeller for driving its rotation is provided in the middle of the rotating shaft, and a flexible stirring strip is fixedly provided at the bottom of the rotating shaft.

[0007] Preferably, a second support plate is provided inside the housing, the second support plate is located below the first support plate, a second vent hole is provided in the middle of the second support plate, the rotating shaft is located in the second vent hole, and the impeller has a semi-open structure.

[0008] Preferably, the bottom of the rotating shaft is fixedly provided with a sealing column that reciprocates up and down and seals the narrow throat of the Laval tube, and one end of the flexible stirring strip is fixedly connected to the bottom surface of the sealing column.

[0009] Preferably, the housing is provided with an inner cylinder, the top end of the inner cylinder is fixedly connected to the first support plate, the rotating shaft passes through and is rotatably connected to the bottom surface of the inner cylinder, the inner cylinder is provided with a spring and a push plate, the push plate is fixedly connected to the rotating shaft and slides up and down in the inner cylinder, and the spring is fitted on the rotating shaft and located between the push plate and the bottom surface of the inner cylinder.

[0010] Preferably, the rotating shaft is a hollow tubular structure, the rotating shaft passes through the sealing column, the top end of the rotating shaft is provided with an air guide column, the air guide column is provided with a fourth vent hole horizontally, the top end of the rotating shaft is connected to the fourth vent hole, the first support plate is provided with a sealing tube, the sealing tube is provided with a third vent hole horizontally matching the fourth vent hole, and the sealing column slides up and down inside the sealing tube.

[0011] Preferably, the drive mechanism includes a motor, a sprocket, and a chain that matches the sprocket. The motor is fixedly mounted outside the housing, and the output end of the motor passes through and rotates to seal the housing. The output end of the motor is fixedly connected to the shaft of the sprocket.

[0012] Preferably, the air inlet end of the aeration pipe is connected to external high-pressure gas via a flexible hose.

[0013] The present invention has the following advantages: 1. This invention, by setting a reciprocating drive mechanism and a Laval tube at the bottom of the flotation tank, utilizes the low-pressure suction function of the Laval tube to achieve the effect of cyclical suction and gas-liquid mixing of large-particle colloidal solution at the bottom of the tank, thereby breaking the colloidal particles into smaller particles and allowing them to float again under the action of air bubbles. This solves the problem of sedimentation at the bottom of the flotation tank caused by long-term operation, and ensures the continuity and high efficiency of wastewater treatment. 2. This invention achieves a secondary impact crushing function on the colloid after gas-liquid mixing by the cooperation of the impeller, the rotating shaft and the flexible stirring strip, thereby further improving the crushing effect; 3. This invention achieves the function of intermittent aeration of colloidal mixture by means of the linkage between the rotating shaft, spring, sealing tube and air guide column. The high-energy impact energy of intermittent aeration can further improve the breaking effect of the colloid. 4. This invention, through the unique structural design of the sealing column, sealing pipe and air guide column, can achieve automatic sealing after the gas supply is cut off due to the action of spring, avoiding equipment blockage caused by backflow and realizing long-term trouble-free operation of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the bottom cleaning mechanism structure of the present invention; Figure 4 This is a schematic diagram of the crushing mechanism of the present invention; Figure 5 yes Figure 4 A cross-sectional structural diagram.

[0015] In the diagram, 1. Box body; 2. Coagulation tank; 3. Aeration tank; 4. Air flotation tank; 5. Clear water tank; 6. Sludge collection tank; 7. Chain scraping mechanism; 8. Sludge scraper; 9. Drive mechanism; 10. Aeration pipe; 11. Crushing mechanism; 12. Shell; 13. Laval tube; 14. First support plate; 15. First vent; 16. Inner cylinder; 17. Spring; 18. Rotating shaft; 19. Push plate; 20. Second vent; 21. Impeller; 22. Liquid inlet; 23. Sealing column; 24. Flexible stirring strip; 25. Sealing pipe; 26. Third vent; 27. Air guide column; 28. Fourth vent; 29. ​​Second support plate; 30. Sprocket; 31. Chain; 32. Motor. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0018] like Figure 1 As shown, a leather wastewater reduction and treatment device includes a rectangular box 1 for wastewater treatment. From left to right, the box 1 contains a coagulation tank 2, an aeration tank 3, a flotation tank 4, a sludge collection tank 6, and a clear water tank 5. Flocculants are added to the coagulation tank 2 and mixed using an installed stirring paddle. Faster-sinking colloids collect directly at the bottom and are discharged for dewatering. Suspended colloids are discharged into the aeration tank 3 for aeration treatment. Scum enters the flotation tank for treatment. During the treatment process, a small amount of colloids settles to the bottom of the flotation tank. The upper part of the flotation tank 4 is equipped with a scraper 8 and a chain scraping mechanism 7 that drives its rotation. The chain scraping mechanism 7 has multiple structures and can use existing technologies. Under the action of the chain scraping mechanism 7, the scum is scraped into the sludge collection tank 6. Clear water in the middle enters the clear water tank 5 through a pipe. To break up and float the settled colloids again, as... Figure 2 As shown, an aeration pipe 10 and a drive mechanism 9 for horizontal reciprocating movement of the aeration pipe 10 are installed at the bottom of the flotation tank 4. The aeration pipe 10 is closely attached to the bottom surface of the flotation tank 4. Multiple crushing mechanisms 11 are connected below the aeration pipe 10. Each crushing mechanism 11 includes a shell 12 and a Laval tube 13. The shell 12 is a tubular structure. The upper end of the shell 12 is sealed to the aeration pipe 10 and is used to transmit high-pressure gas. The lower end of the shell 12 is sealed to the upper end of the Laval tube 13. The Laval tube 13 is a tubular structure that is thin in the middle and thick at both ends. An inlet 22 is provided at the narrow throat of the Laval tube 13. When the high-speed airflow passes through the narrow throat of the Laval tube 13, a low-pressure zone is formed. The liquid adsorbed from the inlet 22 enters the Laval tube 13 for gas-liquid mixing. The bottom of the Laval tube 13 is close to the bottom surface of the flotation tank 4, so that the airflow is sprayed out from directly to the bottom of the tank, achieving the effect of cleaning.

[0019] like Figure 3As shown, the aeration pipe 10 consists of two interconnected pipes. The drive mechanism 9 includes a motor 32, a sprocket 30, and a chain 31 that matches the sprocket 30. There are four sprockets 30, which are linked in pairs via a drive shaft. There are two chains 31 that connect the four sprockets. The motor 32 is fixedly mounted outside the housing 1. The output end of the motor 32 passes through and rotates the sealed housing 1. The output end of the motor 32 is fixedly connected to the shaft of the sprocket 30. The motor 32 is a servo motor or other motor with controllable rotation. Both ends of the aeration pipe 10 are fixedly connected to the chain. The movement of the motor 32 causes the aeration pipe 10 to move horizontally back and forth at the bottom of the flotation tank. The air inlet of the aeration pipe 10 is connected to external high-pressure gas through a hose. The hose can be adjusted according to the movement of the aeration pipe 10 to avoid contact with the chain and other structures.

[0020] like Figure 4 , Figure 5 As shown, a circular first support plate 14 and a second support plate 29 are installed inside the housing 12. The second support plate 29 is located below the first support plate 14. The first support plate 14 has multiple first vent holes 15. A rotating shaft 18 is installed inside the housing 12. The center of the first support plate 14 has a circular hole that matches the rotating shaft 18. The second support plate 29 has a second vent hole 20 in the middle. The diameter of the second vent hole 20 is larger than that of the rotating shaft 18. One end of the rotating shaft 18 is rotatably connected to the first support plate 14 through the circular hole. This circular hole structure also allows the rotating shaft 18 to rotatably connect with the first support plate 29. The inner cylinder 16 is provided inside the housing 12. The top of the inner cylinder 16 is fixedly connected to the first support plate 14. The rotating shaft 18 passes through and is rotatably connected to the bottom surface of the inner cylinder 16. The lower part of the rotating shaft 18 passes through the second vent hole 20 again and extends to the lower part of the Laval tube 13. The inner cylinder 16 is provided with a spring 17 and a push plate 19. The push plate 19 is fixedly connected to the rotating shaft 18 and slides up and down inside the inner cylinder 16. The spring 17 is fitted on the rotating shaft 18 and is located between the push plate 19 and the bottom surface of the inner cylinder 16. The spring 17 pushes the push plate 19 upward, thereby driving the rotating shaft 18 to move upward.

[0021] An impeller 21 is provided in the middle of the rotating shaft 18 to drive the rotating shaft 18 to rotate. The impeller 21 has a semi-open structure and its diameter is smaller than the inner diameter of the housing 12. Gas flows through the impeller 21 and enters the Laval tube 13 through the second vent 20 in the middle of the second support plate 29. The gas pushes the impeller 21 and drives the rotating shaft 18 to rotate. A sealing column 23 is fixed at the bottom of the rotating shaft 18, which moves up and down and seals the narrow throat of the Laval tube 13. The upper part of the sealing column 23 is used to seal the liquid inlet. The cylinder of the throat tube 22 and the lower part of the sealing column 23 are frustoconical and fit against the lower part of the Laval tube 13 to prevent the high-pressure water flow from pressing the sealing column 23 into the shell 12. The bottom surface of the sealing column 23 is provided with a flexible stirring strip 24. One end of the flexible stirring strip 24 is fixedly connected to the bottom surface of the sealing column 23, and the other end of the flexible stirring strip 24 can extend and approach the inner wall of the Laval tube 13. The flexible stirring strip 24 hangs down when the sealing column 23 is not rotating, and extends horizontally after rotation to break up the colloid.

[0022] To further break the colloid into smaller particles and facilitate bubble floating, the rotating shaft 18 is designed as a hollow tubular structure. The rotating shaft 18 passes through the sealing column 23, and a small injection hole is formed at the bottom end of the rotating shaft 18. A guide column 27 is installed at the top end of the rotating shaft 18. The diameter of the guide column 27 is larger than the diameter of the rotating shaft 18 to prevent the rotating shaft 18 from sliding down from the first support plate 14. The guide column 27 has a fourth vent hole 28 horizontally, which runs horizontally through the entire guide column 27. The top end of the rotating shaft 18 is connected to the fourth vent hole 28. The first support plate 14 is fixedly installed with a sealing tube 25. The sealing tube 25 has a third vent hole 26 horizontally that matches the fourth vent hole 28. Both the third vent hole 26 and the fourth vent hole 28 are flat hole structures. The sealing column 23 slides up and down inside the sealing tube 25 to intermittently connect the third vent hole 26 and the fourth vent hole 28, so that high-pressure gas is intermittently ejected from the bottom end of the rotating shaft 18, realizing the pulse aeration function.

[0023] Working principle: The air compressor system installed at the end of the housing 1 stores a large amount of high-pressure gas. On one hand, it supplies gas to the aeration tank for aeration, and on the other hand, it is introduced into the aeration pipe 10 through a hose. The motor 32 is started, and the motor 32 rotates in different directions at certain intervals to drive the chain 31 to rotate. This causes the aeration pipe 10 to drive the crushing mechanism 11 to move horizontally back and forth at the bottom of the flotation tank 4. After the gas enters the housing 12, it passes through the first vent 15, the impeller 21, the second vent 20, and finally moves downward through the Laval tube 13. The high-pressure gas pushes the sealing column 23 downward, opening the liquid inlet 22 and the narrow throat of the Laval tube 13. The high-speed airflow creates a low-pressure zone at the narrow throat of the Laval tube 13, causing the inlet 22 to draw in the colloidal solution from the bottom of the pool and mix it with the liquid, thus achieving the first breakdown of large colloidal particles. Finally, the airflow is sprayed from the Laval tube 13 to the bottom of the pool, washing away the adhering substances. At the same time, the high-pressure airflow drives the impeller 21 and the rotating shaft 18 to rotate. The rotation of the rotating shaft 18 drives the sealing column 23 and the upper-fixed flexible agitator strip 24 to rotate. The high-speed rotating flexible agitator strip further agitates the passing gas-liquid mixture, achieving further breakdown of large colloidal particles. Simultaneously, the downward movement of the sealing column 23 drives the rotating shaft 18 to rotate. Shaft 18 and air guide column 27 move downwards. Air guide column 27 slides downwards within sealing tube 25, connecting the third vent 26 and the fourth vent 28. High-pressure gas then enters shaft 18 and is ejected from the bottom. The ejection of high-pressure gas towards the bottom of the pool creates a reaction force that pushes shaft 18 and air guide column 27 upwards, causing the third vent 26 and the fourth vent 28 to misalign, cutting off the gas supply to shaft 18. After the gas supply is cut off, the gas in Laval tube 13 pushes sealing column 23 and shaft 18 downwards, reconnecting the third vent 26 and the fourth vent 28, thus realizing the pulse aeration function of shaft 18. The energy of pulse aeration... The smaller volume and bubbles facilitate the breakage of colloids, achieving a third breakage function. After the third breakage, the small colloids float to the surface again under the action of small bubbles and are scraped off by the scraper plate 8. After the material at the bottom of the flotation tank 4 is cleaned, the air supply to the aeration pipe 10 is cut off. Under the push of the spring 17, the rotating shaft 18, the sealing column 23, and the air guide column 27 move upward. The sealing column 23 seals the liquid inlet 22 and the Laval tube 13. The upward movement of the air guide column 27 causes the third vent 26 and the fourth vent 28 to be misaligned, thus sealing the rotating shaft 18 and preventing the liquid from flowing back into the crushing mechanism 11, ensuring the long-term normal operation of the equipment.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A leather wastewater reduction and treatment device, characterized in that, The container includes a box (1), which contains a coagulation tank (2), an aeration tank (3), a flotation tank (4), a slag collection tank (6), and a clear water tank (5) arranged from left to right. The flotation tank (4) is equipped with a slag scraper (8) and a chain scraper mechanism (7) that drives it to rotate. The flotation tank (4) is equipped with an aeration pipe (10) and a drive mechanism (9) that makes the aeration pipe (10) move horizontally back and forth. The aeration pipe (10) is close to the bottom surface of the flotation tank (4).

2. The leather wastewater reduction and treatment device according to claim 1, characterized in that: The aeration pipe (10) is connected to a plurality of crushing mechanisms (11) below. The crushing mechanism (11) includes a shell (12) and a Laval tube (13). The lower end of the shell (12) is sealed and connected to the upper end of the Laval tube (13). The narrow throat of the Laval tube (13) is provided with a liquid inlet (22).

3. The leather wastewater reduction and treatment device according to claim 2, characterized in that: The housing (12) is provided with a first support plate (14), and the first support plate (14) is provided with a first vent hole (15). The housing (12) is provided with a rotating shaft (18), one end of the rotating shaft (18) is rotatably connected to the first support plate (14), the lower part of the rotating shaft (18) extends to the lower part of the Laval tube (13), the middle part of the rotating shaft (18) is provided with an impeller (21) that drives it to rotate, and the bottom of the rotating shaft (18) is fixedly provided with a flexible stirring strip (24).

4. The leather wastewater reduction and treatment device according to claim 3, characterized in that: The housing (12) is provided with a second support plate (29), which is located below the first support plate (14). The second support plate (29) has a second vent hole (20) in the middle. The rotating shaft (18) is located in the second vent hole (20). The impeller (21) has a semi-open structure.

5. The leather wastewater reduction and treatment device according to claim 4, characterized in that: The bottom of the rotating shaft (18) is fixedly provided with a sealing column (23) that moves up and down and seals the narrow throat of the Laval tube (13). One end of the flexible stirring strip (24) is fixedly connected to the bottom surface of the sealing column (23).

6. The leather wastewater reduction and treatment device according to claim 5, characterized in that: The housing (12) is provided with an inner cylinder (16). The top end of the inner cylinder (16) is fixedly connected to the first support plate (14). The rotating shaft (18) passes through and is rotatably connected to the bottom surface of the inner cylinder (16). The inner cylinder (16) is provided with a spring (17) and a push plate (19). The push plate (19) is fixedly connected to the rotating shaft (18) and slides up and down inside the inner cylinder (16). The spring (17) is fitted on the rotating shaft (18) and is located between the push plate (19) and the bottom surface of the inner cylinder (16).

7. The leather wastewater reduction and treatment device according to claim 6, characterized in that: The rotating shaft (18) is a hollow tubular structure. The rotating shaft (18) passes through the sealing column (23). The top end of the rotating shaft (18) is provided with an air guide column (27). The air guide column (27) is horizontally provided with a fourth vent hole (28). The top end of the rotating shaft (18) is connected to the fourth vent hole (28). The first support plate (14) is provided with a sealing tube (25). The sealing tube (25) is horizontally provided with a third vent hole (26) that matches the fourth vent hole (28). The sealing column (23) slides up and down inside the sealing tube (25).

8. The leather wastewater reduction and treatment device according to claim 1, characterized in that: The drive mechanism (9) includes a motor (32), a sprocket (30) and a chain (31) that matches the sprocket (30). The motor (32) is fixedly installed outside the housing (1). The output end of the motor (32) passes through and rotates to seal the housing (1). The output end of the motor (32) is fixedly connected to the shaft of the sprocket (30).

9. The leather wastewater reduction and treatment device according to claim 1, characterized in that: The air inlet of the aeration pipe (10) is connected to external high-pressure gas via a hose.

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