A DMF wastewater treatment system

Abstract

The application discloses a DMF wastewater treatment system, which comprises a reactor, a stripping tower, a containing tank, a sodium hydroxide solution storage tank and a flocculant storage tank; the reactor comprises a first input end and a second input end, the first input end is communicated with a DMF wastewater output port, the second input end is communicated with the sodium hydroxide solution storage tank, the flocculant storage tank and a gas inlet pipeline, the reactor comprises a first output end and a second output end, the first output end is communicated with the containing tank, the second output end is communicated with the stripping tower, and a gas-liquid distribution assembly connected with the second input end and a floating scum adsorption assembly connected with the first output end are arranged in the reactor. The DMF wastewater treatment system can effectively improve the treatment efficiency of DMF wastewater.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically a DMF wastewater treatment system. Background Technology

[0002] DMF (N,N-dimethylformamide) wastewater is a high-concentration organic wastewater, mainly originating from the production processes of chemical plants, pharmaceutical factories, and leather processing plants. Because these factories frequently use DMF during processing, the concentration of DMF in the wastewater becomes high. Furthermore, the stable molecular structure of DMF makes it difficult for microorganisms to degrade, increasing the difficulty of wastewater treatment. Secondly, DMF has a certain degree of toxicity, posing a potential threat to the environment and human health. In addition to DMF, the wastewater may also contain other organic matter, inorganic salts, heavy metals, and other impurities, further increasing the complexity of treatment.

[0003] A DMF wastewater treatment system is a combination of equipment or processes specifically designed to treat industrial wastewater containing dimethylformamide (DMF). This system typically consists of several devices connected in series, allowing for the gradual and systematic treatment of DMF wastewater discharged from the factory. Due to the strong biotoxicity of DMF itself and the secondary toxic substances produced during its degradation, direct microbial degradation is difficult to achieve. Treatment generally involves physical and chemical treatments followed by microbial treatment. In the reactor, heating causes DMF to hydrolyze, producing dimethylamine (DMA) and formic acid. The former requires additional stripping, while the latter corrodes equipment and reduces the reactor's lifespan.

[0004] Before high-temperature decomposition of DMF wastewater, the wastewater is usually filtered. However, this filtration is only for large solid particles. If the filtration precision is too high, it will affect the filtration efficiency and slow down the wastewater treatment process. If small particles are not removed, they will cause scaling during the heating and hydrolysis process, and will adhere to the surface of the packing material during subsequent pipeline transportation and stripping, causing blockage of the pipeline and packing material, affecting the feed into the reactor, and thus affecting the DMF wastewater treatment effect. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a DMF wastewater treatment system that can effectively improve the treatment efficiency of DMF wastewater.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a DMF wastewater treatment system, comprising a reactor, a stripping tower, a containment tank, a sodium hydroxide solution storage tank, and a flocculant storage tank; the reactor includes a first input end and a second input end, the first input end being connected to a DMF wastewater outlet, and the second input end being connected to the sodium hydroxide solution storage tank, the flocculant storage tank, and an air inlet pipe; the reactor also includes a first output end and a second output end, the first output end being connected to the containment tank, and the second output end being connected to the stripping tower; the reactor is equipped with a gas-liquid distribution component connected to the second input end and a foam adsorption component connected to the first output end; the DMF wastewater... The treatment method of the treatment system includes the following steps: 1) Injecting DMF wastewater into the reactor; 2) Heating the DMF wastewater to 30-35℃, introducing flocculant, and then introducing gas through the air inlet pipe, with the foam adsorption component adsorbing the foam until no more foam is generated; 3) Introducing sodium hydroxide solution to adjust the pH to 11-12.5, heating the DMF wastewater to 110-135℃, reacting for 80-120 minutes to hydrolyze the DMF; 4) Introducing sodium hydroxide solution to adjust the pH of the hydrolysate to 11-12, introducing the hydrolysate into a stripping tower, stripping the DMA in the stripping tower, and incinerating the stripped DMA into nitrogen and carbon dioxide by oxygen-enriched air at above 800℃; 5) Adding acid to the stripping residue to neutralize to a pH of 6-9 before discharging into a biological treatment tank. This DMF wastewater treatment system hydrolyzes DMF wastewater at 110-135℃ and pH 11-12.5 to generate DMA and sodium formate, avoiding the formation of formic acid that corrodes the reactor. Then, sodium hydroxide solution is introduced to adjust the pH of the hydrolysate to 11-12, converting dimethylamine into a free state. DMA is then stripped in a stripping tower using residual heat, and the stripped DMA is incinerated to decompose into nitrogen and carbon dioxide. The stripping residue is then neutralized and decomposed by microorganisms in a biological treatment tank. Furthermore, the DMF wastewater does not require fine filtration; instead, small particles in the wastewater are flocculated into foam by introducing flocculant followed by gas. This foam is then adsorbed into a collection tank by a foam adsorption component. Heating the DMF wastewater to 30-35℃ further enhances flocculation efficiency. Since the DMF in the wastewater itself requires heating for hydrolysis, flocculation efficiency is improved without additional energy consumption. This eliminates the need for fine filtration, saving costs and time, and significantly improving the treatment efficiency of DMF wastewater.

[0007] In the above technical solution, preferably, the container tank is connected to an absorption tower for adsorbing the exhaust gas from the container tank.

[0008] In the above technical solution, preferably, the DMF wastewater treatment system includes at least two reactors connected in parallel. By setting multiple reactors in parallel, it is possible to clean and maintain reactors that are not in operation without stopping operation by switching between them.

[0009] In the above technical solution, preferably, the foam adsorption assembly includes a support frame fixed inside the reactor. A telescopic tube, driven to rotate by a first driving device, is rotatably mounted on the support frame. A bracket extends from the side of the telescopic tube. A roller, driven by a second driving device, is rotatably mounted on the bracket. A foam scraper, fitted to the roller, is mounted on the bracket. The foam scraper and the roller surface form a foam-receiving space. An extraction tube passes through the center of the telescopic tube, with its end bent and extending into the foam-receiving space. The extraction tube connects to the receiving tank, and a negative pressure pump is mounted on the extraction tube. This structure allows the roller to rotate via the second driving device, causing foam to adhere to its surface. The foam is then scraped off by the foam scraper and stored in the foam-receiving space. The negative pressure pump then draws the foam from the foam-receiving space through the extraction tube to the receiving tank for collection.

[0010] In the above technical solution, preferably, the frothing scraper has a raised strip facing the roller side with its contact surface matching the arc surface of the outer wall of the roller. The top surface of the raised strip forms a frothing guiding slope that is higher than the side near the extraction pipe, away from the extraction pipe side. The raised strip is in close contact with the roller surface and forms a frothing gathering area near the suction port side of the extraction pipe. As the roller rotates, the frothing on the roller surface is guided to the frothing gathering area. This structure can gather the frothing towards the suction port side of the extraction pipe through the rotation of the roller, avoiding the accumulation of frothing on the scraper and allowing for faster frothing extraction.

[0011] In the above technical solution, preferably, the telescopic pipe fitting includes an inner pipe fitting rotatably mounted on a support frame and an outer pipe fitting axially movable and sleeved on the inner pipe fitting. An adjusting motor is mounted on the outer pipe fitting, and a screw is mounted on the output shaft of the adjusting motor. A mating block is provided inside the inner pipe fitting, and the screw is threadedly connected to the mating block. The bracket is connected to the outer pipe fitting. This structure allows the raising and lowering of the outer pipe fitting to be driven by adjusting the forward and reverse rotation of the motor, thereby adjusting the height of the roller so that the roller can be positioned at a suitable height in contact with the water surface.

[0012] In the above technical solution, preferably, a water level sensor is provided on the outer wall of the telescopic pipe, and the water level sensor is electrically connected to the regulating motor. This structure allows the water level to be detected by the water level sensor, and the regulating motor can automatically adjust the height of the drum under the control of the control device.

[0013] In the above technical solution, preferably, the gas-liquid distribution assembly includes a horizontal conveying pipe connected to the telescopic pipe and a vertical conveying pipe connected to the horizontal conveying pipe. The second input end is connected to a vertically arranged guide sleeve located below the rotation center of the telescopic pipe. The bottom of the rotation center of the horizontal conveying pipe is provided with a guide pipe passing through the guide sleeve. The guide pipe can move up and down and rotate within the guide sleeve. The vertical conveying pipe is provided with several one-way nozzles. This structure allows the gas-liquid distribution assembly to not only introduce gas and liquid at different depths in wastewater, but also to rotate with the telescopic pipe, thus functioning as a stirrer.

[0014] In the above technical solution, preferably, the top of the telescopic tube is provided with a first helical gear, the first helical gear meshes with a second helical gear at one end of the transverse rotating shaft, the third helical gear at the other end of the transverse rotating shaft meshes with a fourth helical gear on the output shaft of the first drive device, and the first drive device is fixed on the reactor.

[0015] In the above technical solution, preferably, the second driving device includes a helical toothed ring sleeved on the outer periphery of the telescopic tube. The top of the helical toothed ring is provided with several guide rods, which pass through guide holes in the support frame. A spring is provided between the helical toothed ring and the support frame. A fifth helical gear meshes with the helical toothed ring at the end of the roller. This structure eliminates the need for an additional motor to drive the roller rotation on the support. Furthermore, installing a motor on the support due to its rotation would complicate the power supply structure and cause technical problems related to circuit sealing. In this structure, as the first driving device drives the telescopic tube to rotate and the roller revolves around the telescopic tube, the engagement of the fifth helical gear on the roller with the helical toothed ring causes the roller to rotate. The structure is simple, and the spring force allows the helical toothed ring to rise and fall during the extension and retraction of the telescopic tube, without affecting the roller's transmission.

[0016] Compared with existing technologies, this invention has the following advantages: This DMF wastewater treatment system hydrolyzes DMF wastewater at 110-135℃ and pH 11-12.5 to generate DMA and sodium formate, avoiding the formation of formic acid that corrodes the reactor. Then, sodium hydroxide solution is introduced to adjust the pH of the hydrolysate to 11-12, converting dimethylamine into a free state. DMA is then stripped using waste heat in a stripping tower, and the stripped DMA is incinerated and decomposed into nitrogen and carbon dioxide. Finally, the stripping residue is neutralized and treated in a biological treatment tank. Microbial decomposition eliminates the need for fine filtration of DMF wastewater. Instead, small particles in the wastewater are flocculated into foam by introducing flocculant followed by gas. The foam is then adsorbed into a container by a foam adsorption component. The wastewater is heated to 30-35°C to enhance flocculation efficiency. Since DMF itself requires heating for hydrolysis, this process improves flocculation efficiency without consuming additional energy. Overall, it eliminates the need for fine filtration, saving on filtration costs and time, and significantly improving the treatment efficiency of DMF wastewater. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention.

[0018] Figure 2 This is a schematic diagram of the reactor structure in Embodiment 1 of the present invention.

[0019] Figure 3 This is a cross-sectional view of the reactor in Embodiment 1 of the present invention.

[0020] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0021] Figure 5 This is a schematic diagram of the internal structure of the reactor in Embodiment 1 of the present invention.

[0022] Figure 6 This is a schematic diagram of the internal structure of the telescopic pipe in Embodiment 1 of the present invention.

[0023] Figure 7 This is a cross-sectional view of the roller and the foam scraper in Embodiment 1 of the present invention.

[0024] Figure 8 This is a schematic diagram of the structure of the foam scraper in Embodiment 1 of the present invention.

[0025] Figure 9 This is a partial structural diagram of the reactor interior in Embodiment 2 of the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: See also Figures 1 to 8Example 1: A DMF wastewater treatment system includes a reactor 1, a stripping tower 2, a containment tank 3, a sodium hydroxide solution storage tank 4, and a flocculant storage tank 5. The reactor 1 includes a first input terminal 6 and a second input terminal 7. The first input terminal 6 is connected to a DMF wastewater outlet 8, and the second input terminal 7 is connected to the sodium hydroxide solution storage tank 4, the flocculant storage tank 5, and an air inlet pipe 10. The reactor 1 also includes a first output terminal 11 and a second output terminal 12. The first output terminal 11 is connected to the containment tank 3, and the second output terminal 12 is connected to the stripping tower 2. The reactor 1 is equipped with a gas-liquid distribution component 13 connected to the second input terminal 7 and a foam adsorption component 14 connected to the first output terminal 11. The treatment method of the DMF wastewater treatment system includes the following steps: 1. [The text abruptly ends here, likely due to an incomplete sentence or missing information.] Wastewater is injected into reactor 1: DMF wastewater is injected into reactor 1 after preliminary filtration; 2. The DMF wastewater is heated to 30-35℃ by steam, and after flocculant is introduced, gas is introduced through the air inlet pipe 10, and the foam adsorption component 14 adsorbs the foam until foam no longer forms; 3. Sodium hydroxide solution is introduced to adjust the pH to 11-12.5, and the DMF wastewater is heated to 110-135℃ and reacted for 80-120 minutes to hydrolyze the DMF; 4. Sodium hydroxide solution is introduced to adjust the pH of the hydrolysate to 11-12, and the hydrolysate is introduced into stripping tower 2, where DMA is stripped. The stripped DMA is decomposed into nitrogen and carbon dioxide by incineration with oxygen-enriched air at a temperature above 800℃; 5. Acid is added to the stripping residue to neutralize it to a pH of 6-9 before it is discharged into the biological treatment tank. This DMF wastewater treatment system hydrolyzes DMF wastewater at 110-135℃ and pH 11-12.5 to generate DMA and sodium formate, avoiding the formation of formic acid that corrodes reactor 1. Because dimethylamine forms strong hydrogen bonds with water molecules, it exists in large quantities as an ion at room temperature, significantly suppressing volatility and making stripping extremely difficult. The pH of the hydrolysate is adjusted to 11-12 by introducing sodium hydroxide solution, converting dimethylamine into a free state. Then, in stripping tower 2, the residual heat is used to enhance mass transfer and strip the DMA. Finally, the stripped DMF is... MA is incinerated and decomposed into nitrogen and carbon dioxide. The stripping residue is then neutralized and decomposed by microorganisms in a biological treatment tank. DMF wastewater does not require fine filtration; instead, small particles in the wastewater are flocculated into foam by introducing flocculant followed by gas. This foam is then adsorbed into the receiving tank 3 by the foam adsorption component 14. Heating the DMF wastewater to 30-35℃ enhances flocculation efficiency. At this temperature, the viscosity of the wastewater is reduced and the flocculation effect is improved compared to low-temperature wastewater, and the bubble stability is better than at higher temperatures, thus improving the flotation effect. Since DMF in the wastewater itself requires heating for hydrolysis, flocculation efficiency is improved without additional energy consumption, eliminating the need for fine filtration, saving costs and time, and significantly improving the treatment efficiency of DMF wastewater.

[0027] In this embodiment, in order to adsorb the exhaust gas discharged from the container tank 3, the container tank 3 is connected to an absorption tower 15 for adsorbing the exhaust gas of the container tank 3.

[0028] In this embodiment, the DMF wastewater treatment system includes at least two reactors 1 connected in parallel. By setting up multiple reactors 1 in parallel, it is possible to clean and maintain a reactor 1 that is not in operation without stopping its operation by switching reactors 1.

[0029] In this embodiment, the foam adsorption assembly 14 includes a support frame 16 fixed inside the reactor 1. A telescopic tube 18 driven to rotate by a first driving device 17 is rotatably mounted on the support frame 16. A bracket 19 extends from the side of the telescopic tube 18. A roller 21 driven by a second driving device 20 is rotatably mounted on the bracket 19. A foam scraper 22 that fits against the roller 21 is mounted on the bracket 19. The foam scraper 22 and the surface of the roller 21 form a foam containing space 23. An extraction tube 24 is inserted through the center of the telescopic tube 18. The end of the extraction tube 24 is bent and extends into the foam containing space 23. The extraction tube 24 is connected to the containing tank 3. A negative pressure pump is mounted on the extraction tube 24. This structure enables the second drive device 20 to drive the roller 21 to rotate, causing foam to adhere to the surface of the roller 21. The foam is then scraped off by the foam scraper 22 and stored in the foam holding space 23. The foam in the foam holding space 23 is then extracted through the extraction pipe 24 to the holding tank 3 for collection by the suction action of the negative pressure pump.

[0030] In this embodiment, the foam scraper 22 has a raised strip 25 facing the roller 21 side with its contact surface matching the arc surface of the outer wall of the roller 21. The top surface of the raised strip 25 forms a foam guiding slope 26 that is higher than the side close to the extraction tube 24 on the side away from the extraction tube 24. The raised strip 25 is in close contact with the surface of the roller 21 and forms a foam gathering area 27 on the suction port side close to the extraction tube 24. As the roller 21 rotates, the foam on the surface of the roller 21 is guided to the foam gathering area 27. With this structure, the foam can be gathered towards the suction port side of the extraction tube 24 by the rotation of the roller 21, avoiding the accumulation of foam on the scraper and allowing the foam to be sucked out more quickly.

[0031] In this embodiment, the telescopic pipe fitting 18 includes an inner pipe fitting 28 rotatably mounted on a support frame 16 and an outer pipe fitting 29 axially movable and sleeved on the inner pipe fitting 28. An adjusting motor 30 is mounted on the outer pipe fitting 29, and a screw 31 is mounted on the output shaft of the adjusting motor 30. A mating block 32 is provided inside the inner pipe fitting 28, and the screw 31 is threadedly connected to the mating block 32. A bracket 19 is connected to the outer pipe fitting 29. This structure allows the raising and lowering of the outer pipe fitting 29 to be adjusted by reversing the motor 30, thereby adjusting the height of the roller 21 so that the roller 21 is positioned at a suitable height in contact with the water surface.

[0032] In this embodiment, a water level sensor 33 is installed on the outer wall of the telescopic pipe 18, and the water level sensor 33 is electrically connected to the regulating motor 30. This structure allows the water level to be detected by the water level sensor 33, and the height of the roller 21 can be automatically adjusted by the regulating motor 30 under the control of the control device.

[0033] In this embodiment, the gas-liquid distribution assembly 13 includes a horizontal conveying pipe 34 connected to the telescopic pipe 18 and a vertical conveying pipe 35 connected to the horizontal conveying pipe 34. A second input end 7 is connected to a vertically arranged guide sleeve 36 located below the rotation center of the telescopic pipe 18. A guide pipe 37, passing through the guide sleeve 36, is located at the bottom of the rotation center of the horizontal conveying pipe 34. The guide pipe 37 can move up and down and rotate within the guide sleeve 36. Several one-way nozzles 38 are provided on the vertical conveying pipe 35. This structure allows the gas-liquid distribution assembly 13 to not only introduce gas and liquid into wastewater at different depths, but also to rotate with the telescopic pipe 18, thus functioning as a stirrer.

[0034] In this embodiment, to achieve transmission between the first driving device 17 and the telescopic tube 18, and to avoid interference with the extraction tube 24 extending from the center of the top of the telescopic tube 18, a first helical gear 39 is provided at the top of the telescopic tube 18. The first helical gear 39 meshes with a second helical gear 41 at one end of the transverse rotating shaft 40, and a third helical gear 42 at the other end of the transverse rotating shaft 40 meshes with a fourth helical gear 43 on the output shaft of the first driving device 17. The first driving device 17 is fixed to the reactor 1 and is a motor. It is readily understood by those skilled in the art that the first driving device 17 and the telescopic tube 18 can also be driven by belt transmission, other gear transmission structures, or other transmission structures in the art, as long as interference with the extraction tube 24 extending from the center of the top of the telescopic tube 18 can be avoided.

[0035] In this embodiment, the second driving device 20 includes a helical toothed ring 47 sleeved on the outer periphery of the telescopic tube 18. A plurality of guide rods 48 are provided on the top of the helical toothed ring 47, and the guide rods 48 pass through guide holes in the support frame 16. A spring 49 is provided between the helical toothed ring 47 and the support frame 16. A fifth helical gear 50 meshing with the helical toothed ring 47 is provided at the end of the roller 21. This structure eliminates the need for an additional motor to drive the roller 21 to rotate on the bracket 19. Furthermore, installing a motor on the bracket 19 due to its rotation would complicate the power supply structure and cause technical problems such as circuit sealing. In this structure, as the first driving device 17 drives the telescopic tube 18 to rotate and the roller 21 revolves around the telescopic tube 18, the fifth helical gear 50 on the roller 21 meshes with the helical toothed ring 47, causing the roller 21 to rotate. The structure is simple, and when the telescopic tube 18 extends or retracts, the elastic force of the spring 49 allows the helical toothed ring 47 to rise and fall without affecting the transmission of the roller 21.

[0036] To avoid interference between the extraction tube and the oblique toothed ring 47, the extraction tube 24 is installed by bypassing the bottom of the oblique toothed ring 47 and connecting to the foam collection area 27 from the side of the foam scraper 22.

[0037] In this embodiment, the second input terminal 7 is also connected to a cleaning water pipe 44, and the reactor 1 includes a third output terminal 45, which is connected to a collection tank 46. By connecting the second input terminal 7 to the cleaning water pipe 44, water can be sprayed through the gas-liquid distribution component 13 to clean the inside of the reactor 1 after the sewage treatment is completed, and the cleaned water is discharged to the collection tank 46.

[0038] See Figure 9 Example 2 differs from Example 1 only in the structure of the second driving device 20. In this example, the second driving device 20 includes a roller drive motor 51 fixed on the bracket 19, and the roller drive motor 51 and the roller 21 are connected by a belt drive. In this example, during the process of the first driving device 17 driving the telescopic tube 18 to rotate and the roller 21 revolving around the telescopic tube 18, the roller 21 is powered by the roller drive motor 51 to rotate.

[0039] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A DMF wastewater treatment system, characterized in that: The system includes a reactor (1), a stripping tower (2), a container tank (3), a sodium hydroxide solution storage tank (4), and a flocculant storage tank (5). The reactor (1) includes a first input end (6) and a second input end (7). The first input end (6) is connected to the DMF wastewater outlet (8), and the second input end (7) is connected to the sodium hydroxide solution storage tank (4), the flocculant storage tank (5), and the air inlet pipe (10). The reactor (1) also includes a first output end (11) and a second output end (12). The first output end (11) is connected to the container tank (3), and the second output end (12) is connected to the air inlet pipe (5). The stripping tower (2) is connected, and the reactor (1) is provided with a gas-liquid distribution assembly (13) connected to the second input end (7) and a foam adsorption assembly (14) connected to the first output end (11). The foam adsorption assembly (14) includes a support frame (16) fixed in the reactor (1). A telescopic tube (18) driven to rotate by a first driving device (17) is rotatably mounted on the support frame (16). A bracket (19) extends from the side of the telescopic tube (18). A roller (21) driven by a second driving device (20) is rotatably mounted on the bracket (19). (19) is provided with a foam scraper (22) that fits against the roller (21). The foam scraper (22) and the surface of the roller (21) form a foam receiving space (23). The telescopic pipe (18) is provided with an extraction pipe (24) through its center. The end of the extraction pipe (24) is bent and extends into the foam receiving space (23). The extraction pipe (24) is connected to the receiving tank (3). A negative pressure pump is provided on the extraction pipe (24). The treatment method of the DMF wastewater treatment system includes the following steps: 1) injecting DMF wastewater into the reactor (1); 2) heating the DMF wastewater to 30-35°C and introducing flocculants. After the coagulant, gas is introduced through the air inlet pipe (10), and the foam adsorption component (14) adsorbs the foam until the foam no longer generates; 3) Sodium hydroxide solution is introduced to adjust the pH to 11-12.5, DMF wastewater is heated to 110-135℃, and the reaction is carried out for 80-120 minutes to hydrolyze DMF; 4) Sodium hydroxide solution is introduced to adjust the pH of the hydrolysate to 11-12, and the hydrolysate is introduced into the stripping tower (2) to strip DMA. The stripped DMA is decomposed into nitrogen and carbon dioxide by oxygen-enriched air at 800℃ or above; 5) Acid is added to the stripping residue to neutralize it to pH 6-9 and then discharged into the biological treatment tank.

2. The DMF wastewater treatment system as described in claim 1, characterized in that: The container (3) is connected to an absorption tower (15) for adsorbing the exhaust gas of the container (3).

3. The DMF wastewater treatment system as described in claim 1, characterized in that: The DMF wastewater treatment system includes at least two reactors (1) connected in parallel.

4. The DMF wastewater treatment system as described in claim 1, characterized in that: The foam scraper (22) has a raised strip (25) facing the roller (21) and the contact surface matches the arc surface of the outer wall of the roller (21). The top surface of the raised strip (25) forms a foam guiding slope (26) that is away from the extraction tube (24) and higher than the side close to the extraction tube (24). The raised strip (25) is closely attached to the surface of the roller (21) and forms a foam gathering area (27) near the suction port of the extraction tube (24). As the roller (21) rotates, the foam on the surface of the roller (21) is guided to the foam gathering area (27).

5. The DMF wastewater treatment system as described in claim 1, characterized in that: The telescopic pipe fitting (18) includes an inner pipe fitting (28) rotatably mounted on a support frame (16) and an outer pipe fitting (29) axially movable and sleeved on the inner pipe fitting (28). An adjusting motor (30) is provided on the outer pipe fitting (29), and a screw (31) is provided on the output shaft of the adjusting motor (30). A mating block (32) is provided inside the inner pipe fitting (28), and the screw (31) is threadedly connected to the mating block (32). The bracket (19) is connected to the outer pipe fitting (29).

6. The DMF wastewater treatment system as described in claim 5, characterized in that: A water level sensor (33) is provided on the outer wall of the telescopic pipe (18), and the water level sensor (33) is electrically connected to the regulating motor (30).

7. The DMF wastewater treatment system as described in claim 1, characterized in that: The gas-liquid distribution assembly (13) includes a horizontal conveying pipe (34) connected to the telescopic pipe (18) and a vertical conveying pipe (35) connected to the horizontal conveying pipe (34). The second input end (7) is connected to a vertically arranged guide sleeve (36) located below the rotation center of the telescopic pipe (18). The bottom of the rotation center of the horizontal conveying pipe (34) is provided with a guide pipe (37) passing through the guide sleeve (36). The guide pipe (37) can be raised, lowered and rotated within the guide sleeve (36). The vertical conveying pipe (35) is provided with a plurality of one-way nozzles (38).

8. A DMF wastewater treatment system as described in any one of claims 1 or 5-7, characterized in that: The top of the telescopic tube (18) is provided with a first helical gear (39), which meshes with a second helical gear (41) at one end of the transverse rotating shaft (40), and a third helical gear (42) at the other end of the transverse rotating shaft (40) meshes with a fourth helical gear (43) on the output shaft of the first drive device (17). The first drive device (17) is fixed on the reactor (1).

9. A DMF wastewater treatment system as described in any one of claims 1 or 5-7, characterized in that: The second driving device (20) includes a helical toothed ring (47) sleeved on the outer periphery of the telescopic tube (18). The top of the helical toothed ring (47) is provided with a plurality of guide rods (48). The guide rods (48) pass through the guide holes of the support frame (16). A spring (49) is provided between the helical toothed ring (47) and the support frame (16). The end of the roller (21) is provided with a fifth helical gear (50) that meshes with the helical toothed ring (47).

Images