Emulsion wastewater membrane treatment system

Abstract

The invention relates to the technical field of industrial wastewater treatment, in particular to an emulsion wastewater membrane treatment system which comprises a treatment bottom frame and a pretreatment frame, the pretreatment frame is fixedly arranged at the top of the treatment bottom frame, a separation frame is fixedly arranged in the middle of the interior of the pretreatment frame, and a flocculation tank is fixedly arranged on the left side of the separation frame; an air floatation tank is fixedly arranged on the right side. A flocculation tank and an air floatation tank are integrated through a separation frame in the pretreatment frame, and efficient mixing of magnetic seeds, PAM and emulsified liquid is realized by combining precise medicament feeding of a double-helix feeding device and gradient stirring flow fields of a first stirring paddle, a second stirring paddle and a third stirring paddle, so that rapid formation of dense flocs is promoted; a microbubble generator and ozone in a subsequent air floatation tank cooperatively demulsify, and an oil scraping plate directionally scrapes oil, so that the removal effect of pretreatment on oil and SS is remarkably improved, low-pollution-load inlet water is provided for a ceramic membrane filter tube, and the membrane pollution risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment technology, specifically to an emulsion wastewater membrane treatment system. Background Technology

[0002] Emulsified wastewater is a typical difficult-to-treat wastewater in industries such as metal processing and petrochemicals. It contains a large amount of emulsified mineral oil, surfactants, suspended particles and colloidal substances, and is characterized by high stability, high pollutant concentration and difficulty in oil-water separation.

[0003] Traditional demulsification processes rely on large amounts of chemical agents, with demulsification times ranging from 60 to 240 minutes. They also have limited effectiveness in treating high-concentration emulsions, with oil and suspended solids (SS) removal rates below 80%, leading to excessive loads on subsequent treatment units. Furthermore, some magnetic flocculation or air flotation pretreatment equipment has a fragmented structure, poor synergy between magnetic seed and flocculant addition, and a magnetic seed recovery rate below 85%. This not only increases the cost of chemicals but also generates a large amount of sludge.

[0004] Therefore, the present invention provides an emulsion wastewater membrane treatment system. Summary of the Invention

[0005] The purpose of this invention is to provide an emulsion wastewater membrane treatment system to address the aforementioned technical deficiencies.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: An emulsion wastewater membrane treatment system includes a treatment base frame and a pretreatment frame. The pretreatment frame is fixedly installed at the top of the treatment base frame. A partition frame is fixedly installed in the middle of the pretreatment frame, and a flocculation tank is fixedly installed on the left side of the partition frame and an air flotation tank is fixedly installed on the right side of the partition frame. A filter tube mounting frame is fixedly installed inside the treatment base frame, and the filter tube mounting frame has several filter chambers inside. Several mounting rings are fixedly installed inside each of the filter chambers, and ceramic membrane filter tubes are movably installed inside each of the filter chambers. A detachable cover plate is rotatably installed on one side of each of the filter chambers via a hinge. A feed pipe is fixedly installed on the upper left side of the pretreatment frame, and one end of the feed pipe communicates with the interior of the flocculation tank. A flocculation assembly is installed inside the flocculation tank. The flocculation assembly includes a drive frame fixedly installed on the upper part of the flocculation tank and a first stirring paddle, a second stirring paddle, and a third stirring paddle rotating inside the flocculation tank.

[0007] Furthermore, a first stirring paddle is rotatably arranged on the left side inside the drive frame, and a drive gear is fixedly arranged above the surface of the first stirring paddle. A flocculation control motor is fixedly arranged on the top of the flocculation tank, and the bottom end of the output shaft of the flocculation control motor is fixedly connected to the top end of the first stirring paddle through a coupling. A transmission gear is rotatably arranged inside the drive frame, and the surface of the transmission gear is meshed with the surface of the drive gear. A second stirring paddle is rotatably arranged on the right side inside the drive frame, and a sprocket is fixedly arranged on the top end of the second stirring paddle and the top end of the transmission gear. The surfaces of the two sprockets are connected by a chain drive.

[0008] Furthermore, a connecting frame is fixedly installed on one side of the flocculation tank, and connecting grooves are provided on both the upper and lower sides of the connecting frame. The upper connecting groove is rotatably connected to the bottom end of the second stirring paddle, and a third stirring paddle is rotatably installed in the lower connecting groove. The bottom end of the second stirring paddle extends into the lower connecting groove, and a second drive gear is fixedly installed at the bottom end of the second stirring paddle. A second transmission gear is also rotatably installed in the lower connecting groove. A mating internal gear ring is fixedly installed at the top end of the third stirring paddle. The tooth surfaces of the second transmission gear mesh with the surface of the second drive gear and the inner surface of the mating internal gear ring, respectively.

[0009] Furthermore, an arc-shaped permanent magnet plate is fixedly installed at the lower part of the flocculation tank, and a spiral sludge discharge pipe is fixedly installed at the bottom of the flocculation tank. A scraper motor is fixedly installed on one side of the spiral sludge discharge pipe, and a scraper plate is fixedly installed at the top of the output shaft of the scraper motor. A scraping gap is left between the bottom of the scraper plate and the upper end face of the arc-shaped permanent magnet plate. A feeding circulation pump is also fixedly installed at the lower part of the pretreatment frame, and the feed end of the feeding circulation pump is connected to one side of the spiral sludge discharge pipe. The discharge end of the feeding circulation pump is connected to the interior of the flotation tank through a conveying pipe.

[0010] Furthermore, a guide pipe is fixedly installed at the bottom of the flotation tank, and the bottom end of the guide pipe extends into the interior of the processing base frame. A return circulation pump is fixedly installed above the interior of the processing base frame, and the inlet end of the return circulation pump is connected to one end of the guide pipe. The outlet end of the return circulation pump is connected to a return pipe, and one end of the return pipe is connected to the interior of the flocculation tank.

[0011] Furthermore, an aeration disc is fixedly installed at the bottom of the air flotation tank, and a microbubble generator is fixedly installed at the lower part of the air flotation tank. A waste oil storage rack is fixedly installed at the upper part of the air flotation tank, and an oil scraper is rotatably installed on the top of the waste oil storage rack. An oil scraping control motor is fixedly installed on the top of the air flotation tank, and the bottom end of the output shaft of the oil scraping control motor is fixedly connected to the top of the oil scraper.

[0012] Furthermore, a drain rack is fixedly installed at the bottom of the filter tube mounting frame, and the interior of the drain rack is connected to the interior of several filter chambers; a variable frequency centrifugal pump is fixedly installed on the right side of each of the several filter chambers, and the discharge end of each of the several variable frequency centrifugal pumps is connected to the right end of each of the several ceramic membrane filter tubes; a filter frame is fixedly installed on the right side inside the processing base frame, and a filter plate is slidably installed inside the filter frame.

[0013] Furthermore, the feed ends of several of the variable frequency centrifugal pumps are connected to the left side of the filter frame, and a feed pipe is fixedly installed on the right side of the filter frame. One end of the feed pipe is connected to one end of the guide pipe, and an automatic control valve is installed at the connection between the feed pipe and the guide pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The flocculation tank and the flotation tank are integrated through the partition rack in the pretreatment frame. Combined with the precise dosing of reagents by the double helix dosing device and the gradient stirring flow field of the first, second and third agitators, the magnetic seeds, PAM and emulsion are efficiently mixed to promote the rapid formation of dense flocs. Subsequently, the microbubble generator and ozone in the flotation tank work together to break the emulsion and the oil scraper scrapes the oil in a directional manner, which significantly improves the removal effect of oil and SS in the pretreatment, provides low-pollution load feed water for the ceramic membrane filter tube and reduces the risk of membrane fouling. 2. The flocculation tank utilizes an arc-shaped permanent magnet plate at the bottom to efficiently adsorb magnetic seed-containing flocs. Combined with the scraper of the spiral sludge discharge pipe and the feeding circulation pump, the magnetic seeds are directionally recovered and recycled, reducing reagent consumption. The waste oil storage rack in the flotation tank collects floating oil in a centralized manner, enabling the resource-based reuse of oil. The linkage between the sensor in the feed pipe and the return circulation pump avoids the waste of substandard wastewater and improves the overall water resource utilization rate. 3. The independent design of the filter chamber within the filter tube mounting bracket, along with the mounting ring and disassembly cover, allows for the replacement and maintenance of ceramic membrane filter tubes without requiring a complete shutdown, reducing maintenance difficulty. The synergy between the ultrasonic generator module and the dual-path backwashing assembly within the filter chamber effectively removes contaminants from the membrane surface and pores, extending the service life of the ceramic membrane filter tubes. The flow control of the variable frequency centrifugal pump and the pre-filtration of the filter bracket further ensure the stability of the membrane filtration process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the emulsion wastewater membrane treatment system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the pretreatment frame according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the flocculation tank according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first, second, and third stirring paddles according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the air flotation tank according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the return circulation pump and filter tube mounting frame structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the filter tube mounting bracket and ceramic membrane filter tube structure according to an embodiment of the present invention.

[0016] In the diagram: 1. Processing base frame; 2. Pretreatment frame; 3. Feed pipe; 4. Flocculation tank; 5. Air flotation tank; 6. Separator frame; 7. Spiral sludge discharge pipe; 8. Feed circulation pump; 9. Flocculation control motor; 10. First agitator; 11. Second agitator; 12. Third agitator; 13. Drive gear one; 14. Transmission gear one; 15. Sprocket; 16. Connecting frame; 17. Connecting groove; 18. Drive gear two; 19. Transmission gear two; 20. Meshing internal gear ring; 21. Arc 21. Permanent magnet plate; 22. Scraper motor; 23. Scraper blade; 24. Aeration disc; 25. Microbubble generator; 26. Waste oil temporary storage rack; 27. Oil scraper blade; 28. Oil scraper control motor; 29. ​​Guide pipe; 30. Return circulation pump; 31. Return pipe; 32. Feeding pipe; 33. Filter rack; 34. Filter plate; 35. Filter tube mounting rack; 36. Drain rack; 37. Ceramic membrane filter tube; 38. Variable frequency centrifugal pump; 39. Filter chamber; 40. Mounting ring; 41. Removable cover plate. Detailed Implementation

[0017] The technical solution of the present invention will be further described in a non-limiting manner below with reference to the accompanying drawings and specific embodiments.

[0018] The embodiments of this invention are mainly used to solve the technical problems existing in the traditional emulsion wastewater treatment process, such as low pretreatment efficiency, serious membrane fouling and short life, poor system integration and maintainability, and insufficient resource recycling rate.

[0019] Example 1 like Figures 1 to 7As shown, this embodiment discloses an emulsion wastewater membrane treatment system, which includes a treatment base frame 1 and a pretreatment frame 2. The pretreatment frame 2 is fixedly installed on the top of the treatment base frame 1. A partition frame 6 is fixedly installed in the middle of the interior of the pretreatment frame 2. A flocculation tank 4 is fixedly installed on the left side of the partition frame 6, and an air flotation tank 5 is fixedly installed on the right side of the partition frame 6. A filter tube mounting frame 35 is fixedly installed inside the treatment base frame 1. A plurality of filter chambers 39 are provided inside the filter tube mounting frame 35. A plurality of mounting rings 40 are fixedly installed inside each of the plurality of filter chambers 39. A ceramic membrane filter tube 37 is movably installed inside each of the plurality of filter chambers 39. The surface of the ceramic membrane filter tube 37 is slidably connected to the interior of the plurality of mounting rings 40. Each of the several filter chambers 39 has a detachable cover plate 41 mounted on one side via a hinge. A feed pipe 3 is fixedly mounted on the upper left side of the pretreatment frame 2, and one end of the feed pipe 3 is connected to the interior of the flocculation tank 4. In addition, a double spiral feeder is also mounted on the rear side of the flocculation tank 4, and the feeding end of the double spiral feeder is connected to the interior of the flocculation tank 4.

[0020] It should be noted that when treating emulsified wastewater, the wastewater is first treated by flocculation tank 4, and then sent to the interior of flotation tank 5 for demulsification. The synergistic treatment of magnetic flocculation and micro-nano ozone flotation effectively shortens the demulsification time of the wastewater and reduces the oil concentration, thereby effectively solving the membrane clogging problem caused by incomplete pretreatment in traditional methods. The wastewater is then sent to the interior of ceramic membrane filter tube 37 for filtration. The use of several ceramic membrane filter tubes 37 can effectively improve the treatment efficiency of the wastewater. Furthermore, the ultrasonic generation module and backwashing components installed inside the filter tube mounting frame 35 greatly extend the service life of the ceramic membrane filter tubes 37.

[0021] Specifically, the flocculation tank 4 is equipped with a flocculation assembly, which includes a drive frame fixedly mounted on the upper part of the flocculation tank 4, and a first stirring paddle 10, a second stirring paddle 11, and a third stirring paddle 12 rotating inside the flocculation tank 4. The first stirring paddle 10 is rotatably mounted on the left side inside the drive frame, and a drive gear 13 is fixedly mounted on the upper surface of the first stirring paddle 10. A flocculation control motor 9 is fixedly mounted on the top of the flocculation tank 4, and the bottom end of the output shaft of the flocculation control motor 9 is fixedly connected to the top end of the first stirring paddle 10 through a coupling. A transmission gear 14 is rotatably mounted inside the drive frame, and the surface of the transmission gear 14 meshes with the surface of the drive gear 13. The second stirring paddle 11 is rotatably mounted on the right side inside the drive frame, and a sprocket 15 is fixedly mounted on the top end of the second stirring paddle 11 and the top end of the transmission gear 14. The surfaces of the two sprockets 15 are connected by a chain drive.

[0022] Furthermore, a connecting frame 16 is fixedly installed on one side of the flocculation tank 4, and connecting grooves 17 are provided on both the upper and lower sides of one side of the connecting frame 16. The upper connecting groove 17 is rotatably connected to the bottom end of the second stirring paddle 11, and a third stirring paddle 12 is rotatably installed inside the lower connecting groove 17. The bottom end of the second stirring paddle 11 extends into the interior of the lower connecting groove 17, and a second drive gear 18 is fixedly installed at the bottom end of the second stirring paddle 11. A second transmission gear 19 is also rotatably installed inside the lower connecting groove 17. A mating internal gear ring 20 is fixedly installed at the top end of the third stirring paddle 12. The tooth surfaces of the second transmission gear 19 mesh with the surfaces of the second drive gear 18 and the inner surface of the mating internal gear ring 20, respectively.

[0023] Specifically, the diameter of the drive gear 13 is larger than that of the transmission gear 14. When the first stirring paddle 10 rotates, the drive gear 13 drives the transmission gear 14 to rotate at a higher speed. With the synchronous transmission of the two sprockets 15, the first stirring paddle 10 rotates in the opposite direction at a lower speed than the second stirring paddle 11. At the same time, the third stirring paddle 12 rotates in the opposite direction at a lower speed through the cooperation of the drive gear 18, the transmission gear 19 and the internal gear ring 20. The first stirring paddle 10, the second stirring paddle 11 and the third stirring paddle 12 at different speeds are used to stir the wastewater inside the flocculation tank 4 to form a gradient flocculation flow field.

[0024] Furthermore, an arc-shaped permanent magnet plate 21 is fixedly installed at the lower part of the flocculation tank 4, and a spiral sludge discharge pipe 7 is fixedly installed at the bottom of the flocculation tank 4. A scraper motor 22 is fixedly installed on one side inside the spiral sludge discharge pipe 7, and a scraper plate 23 is fixedly installed at the top of the output shaft of the scraper motor 22. A scraping gap is left between the bottom of the scraper plate 23 and the upper end face of the arc-shaped permanent magnet plate 21. A feeding circulation pump 8 is also fixedly installed at the lower part of the pretreatment frame 2, and the feed end of the feeding circulation pump 8 is connected to one side inside the spiral sludge discharge pipe 7. The discharge end of the feeding circulation pump 8 is connected to the interior of the air flotation tank 5 through a conveying pipe.

[0025] Furthermore, a guide pipe 29 is fixedly installed at the bottom of the flotation tank 5, and the bottom end of the guide pipe 29 extends into the interior of the processing base frame 1. A return circulation pump 30 is fixedly installed above the interior of the processing base frame 1, and the inlet end of the return circulation pump 30 is connected to one end of the guide pipe 29. The outlet end of the return circulation pump 30 is connected to a return pipe 31, and one end of the return pipe 31 is connected to the interior of the flocculation tank 4.

[0026] Specifically, an online turbidity sensor and an oil concentration sensor are installed inside the feed pipe 29 to monitor the effluent water quality in real time. When the water quality meets the conditions of turbidity below 5 NTU, oil concentration below 50 mg / L, and suspended solids below 20 mg / L, a conveying command is triggered. If the water quality does not meet the standards, the linkage control module will automatically return the wastewater to the flocculation tank 4 through the return circulation pump 30 and the return pipe 31 for circulation flocculation treatment until the water quality meets the standards.

[0027] It should be noted that during the flocculation pretreatment of emulsified wastewater, the emulsified wastewater is fed into the flocculation tank 4 through the feed pipe 3. The wastewater inside the flocculation tank 4 is stirred using first impeller 10, second impeller 11, and third impeller 12 at different speeds. Iron oxide magnetic seeds and cationic PAM are added to the flocculation tank 4 through a double-spiral feeder at a flow ratio of 5:1 to ensure synergistic effects. The first impeller 10, second impeller 11, and third impeller 12 create a strong-medium-weak flow field, allowing the magnetic seeds and PAM to fully collide with oil droplets and colloids in the emulsion, rapidly forming dense flocs. This effectively improves sedimentation and separation efficiency and significantly shortens the demulsification time. Finally, the arc-shaped permanent magnet plate 21 adsorbs the magnetic seed-containing flocs at the bottom. The magnetic seeds are recycled through the spiral sludge discharge pipe 7 and the installed magnetic seed recovery machine, significantly reducing reagent costs and sludge production.

[0028] Example 2 Specifically, an aeration disc 24 is fixedly installed at the bottom of the air flotation tank 5, and a microbubble generator 25 is fixedly installed at the lower part of the air flotation tank 5. A waste oil storage rack 26 is fixedly installed at the upper part of the air flotation tank 5, and an oil scraper 27 is rotatably installed on the top of the waste oil storage rack 26. An oil scraping control motor 28 is fixedly installed on the top of the air flotation tank 5, and the bottom end of the output shaft of the oil scraping control motor 28 is fixedly connected to the top of the oil scraper 27. An inclined groove is provided on one side of the oil scraper 27, and the inclined groove is inclined at a low position towards the side of the waste oil storage rack 26.

[0029] It should be noted that after the wastewater has been flocculated, it is fed into the flotation tank 5 by the feed circulation pump 8. Microbubbles of 5-20μm are generated by the microbubble generator 25. At the same time, an ozone generator is set on the rear side of the flotation tank 5. The strong oxidizing property of ozone destroys the double electric layer structure of the emulsified oil droplets. Meanwhile, the flotation effect of the microbubbles causes the oil droplets to coalesce and float, significantly improving the oil removal rate. At the same time, the output shaft of the oil scraper control motor 28 controls the oil scraper 27 to rotate, and sends the floating oil through the inclined groove set on the side of the oil scraper 27 into the interior of the waste oil temporary storage rack 26 for temporary storage. The interior of the waste oil temporary storage rack 26 is connected to the waste oil collection container through a conduit.

[0030] Example 3 Specifically, a drain rack 36 is fixedly installed at the bottom of the filter tube mounting frame 35, and the interior of the drain rack 36 is connected to the interior of several filter chambers 39; the interior of several filter chambers 39 is connected to the interior of the drain rack 36 through an automatic control valve. A variable frequency centrifugal pump 38 is fixedly installed on the right side of several filter chambers 39, and the discharge end of several variable frequency centrifugal pumps 38 is connected to the right end of several ceramic membrane filter tubes 37 respectively; a filter frame 33 is fixedly installed on the right side of the processing base frame 1, and a filter plate 34 is slidably installed inside the filter frame 33, wherein a filter screen is installed inside the filter plate 34; the inlet end of several variable frequency centrifugal pumps 38 is connected to the left side of the interior of the filter frame 33, and a feed pipe 32 is fixedly installed on the right side of the filter frame 33, one end of the feed pipe 32 is connected to one end of the guide pipe 29, and an automatic control valve is installed at the connection between the feed pipe 32 and the guide pipe 29.

[0031] It should be noted that after the water quality is detected as qualified by the sensor inside the feed pipe 29, the automatic control valve at the connection between the feed pipe 29 and the feed pipe 32 is opened, allowing the wastewater to be introduced into the filter frame 33 through the feed pipe 32. The filter plates 34 inside the filter frame 33 filter impurities from the wastewater. Then, several variable frequency centrifugal pumps 38 pump the wastewater into several ceramic membrane filter tubes 37, where the ceramic membranes filter the wastewater. The filtered wastewater is then discharged through the drain rack 36. Simultaneously, several... The filter chamber 39 is equipped with several ultrasonic transducers. One set of ultrasonic transducers is arranged every 300 mm along the axial direction of the ceramic membrane filter tube 37. The ultrasonic transducers are fixed to the outer wall of the ceramic membrane filter tube 37 by clamps. At the same time, the filter chamber 39 is also equipped with a surface flushing channel and an internal flushing channel of the ceramic membrane filter tube 37. Both are connected to the backwash water tank and the compressed air tank. The surface flushing channel injects backwash water through the water collection seat at a flow rate of 1.2 times the production water. The internal flushing channel injects air-water mixed fluid through a special interface at the end of the substrate and uses pulse flushing.

[0032] Example 4 Furthermore, this embodiment discloses the working method of the emulsion wastewater membrane treatment system, including the following steps: The emulsified wastewater to be treated is transported to the flocculation tank 4 through the feed pipe 3; simultaneously, the double-spiral dosing device at the rear of the flocculation tank 4 is activated, adding Fe3O4 magnetic seeds and 0.1-0.3% cationic PAM into the flocculation tank 4 at a flow ratio of 5:1 to ensure initial mixing of the reagents and wastewater; the flocculation control motor 9 is activated, and its output shaft drives the first stirring paddle 10 to rotate through a coupling; the drive gear 13 at the top of the first stirring paddle 10 meshes with the transmission gear 14 in the drive frame; the transmission gear 14 and the two sprockets 15 at the top of the second stirring paddle 11 are synchronously driven by a chain, causing the first stirring paddle 10 to rotate in the opposite direction at a lower speed than the second stirring paddle 11; at the same time, the drive gear 18 at the bottom of the second stirring paddle 11 drives the transmission gear 19 in the connecting groove 17 to rotate. The transmission gear 19 meshes with the internal gear ring 20 at the top of the third agitator 12, causing the third agitator 12 to rotate in the opposite direction at a lower speed. Finally, the first agitator 10, the second agitator 11, and the third agitator 12 form a strong, medium, and weak gradient flow field, which promotes the magnetic seeds, PAM, and oil droplets and colloids in the wastewater to fully collide and quickly form dense flocs. The magnetic seed-containing flocs formed by flocculation are adsorbed to the bottom of the flocculation tank 4 under the magnetic field of the arc-shaped permanent magnet plate 21 at the bottom of the flocculation tank 4. The scraper motor 22 in the spiral sludge discharge pipe 7 is started, which drives the scraper plate 23 to rotate and scrape the adsorbed flocs into the spiral sludge discharge pipe 7. The feeding circulation pump 8 is started to transport the floc mixture in the spiral sludge discharge pipe 7 to the flotation tank 5. At the same time, the supernatant that has not been adsorbed also enters the flotation tank 5 with the mixture, completing the transition from the flocculation stage to the flotation stage. After the mixed liquid enters the flotation tank 5, the microbubble generator 25 at the bottom of the flotation tank 5 and the ozone generator at the rear are activated. The microbubble generator 25 generates microbubbles of 5-20μm, and the ozone diffuses into the wastewater along with the microbubbles. The strong oxidizing properties of the ozone break down the double electric layer of the emulsified oil droplets, and the flotation effect of the microbubbles causes the oil droplets to coalesce and float to the surface. At the same time, the aeration disc 24 at the bottom of the flotation tank 5 assists in aeration, enhances gas-liquid mass transfer, and further improves the demulsification efficiency. The oil scraping control motor 28 at the top of the flotation tank 5 is activated, which drives the oil scraper 27 at the top of the waste oil temporary storage rack 26 to rotate. The inclined groove on one side of the oil scraper 27 tilts towards the lower position of the waste oil temporary storage rack 26 to scrape the floating oil into the waste oil temporary storage rack 26. The temporarily stored waste oil is transported to the external waste oil collection container through the conduit to complete the oil recovery. The demulsified wastewater settles to the bottom of the flotation tank 5 and is discharged through the feed pipe 29 at the bottom of the flotation tank 5 for subsequent water quality monitoring. The online turbidity sensor and oil concentration sensor inside the feed pipe 29 monitor the wastewater quality in real time to determine whether it meets the membrane feed requirements of turbidity ≤5NTU, oil concentration ≤50mg / L, and SS ≤20mg / L. If the water quality meets the requirements, the automatic control valve at the connection between the feed pipe 29 and the feed pipe 32 is kept closed until it is opened later. If the water quality does not meet the requirements, the linkage control module starts the return circulation pump 30 in the treatment base frame 1 and returns the wastewater to the flocculation tank 4 through the return pipe 31 for flocculation-flotation treatment again until the water quality meets the requirements. After the water quality meets the standards, the automatic control valve at the connection between the feed pipe 29 and the feed pipe 32 is opened, and the wastewater enters the filter frame 33 in the treatment base frame 1 through the feed pipe 32; the filter plate 34 in the filter frame 33 intercepts large particulate impurities remaining in the wastewater, completing the pre-filter protection; several variable frequency centrifugal pumps 38 on the right side of the filter tube mounting frame 35 are started, and their feed ends draw the filtered wastewater from the left side of the filter frame 33. According to the parameters of flow rate 3.0-4.0m / s and transmembrane pressure 0.2-0.5MPa, the wastewater is transported to the ceramic membrane filter tube 37 in the filter chamber 39. The ceramic membrane filter tube 37 is fixed in the filter chamber 39 by the mounting ring 40 and connected to the discharge end of the variable frequency centrifugal pump 38. Wastewater undergoes membrane separation within the ceramic membrane filter tube 37. The permeate is collected at the drain rack 36 at the bottom of the filter tube mounting frame 35 and transported to an external reuse or discharge system via the drain rack 36. The concentrate is processed in subsequent processes. When the ceramic membrane filter tube 37 needs to be replaced or repaired, open the disassembly cover 41 on the left side of the filter chamber 39, slide the old filter tube along the mounting ring 40 to remove it, replace it with a new filter tube, and close the disassembly cover 41 to resume operation. The transmembrane pressure difference of the ceramic membrane filter tube 37 is monitored in real time by sensors. When the TMP rise rate is >0.5 bar / h or the system has been running continuously for 48 hours, the linkage control module automatically triggers the backwashing procedure. The ultrasonic transducer in the filter chamber 39 is activated to break down the contaminant layer on the filter tube surface using the cavitation effect. Simultaneously, the surface flushing channel and the in-hole flushing channel are activated: the surface flushing channel draws backwash water at 40-50℃ from the backwash water tank and injects it into the surface of the ceramic membrane filter tube 37 through the water collection seat; the in-hole flushing channel draws a mixture of air and water from the compressed air tank and the backwash water tank and injects it into the filter tube through a special interface at the end of the filter tube at a pulse period of 3 seconds and a pressure of 0.2-0.5MPa to remove blockages in the membrane pores; the wastewater generated by backwashing is returned to the flocculation tank 4 through the pipeline and re-enters the treatment process to avoid wastewater waste. The floating oil collected by the waste oil temporary storage rack 26 can be reused as fuel oil or sold after further purification; the magnetic seed flocs transported by the spiral sludge discharge pipe 7 can be separated into magnetic seeds by an external magnetic seed recovery machine, and the recovered magnetic seeds are returned to the magnetic seed storage tank of the double spiral dosing device for recycling; the treated clean water discharged by the drain rack 36 can meet the industrial reuse standards after ultraviolet disinfection, realizing a closed loop of water resources.

[0033] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0034] This invention is not limited to the optional embodiments described above, and any person skilled in the art can derive other various forms of products based on the teachings of this invention. The above embodiments should not be construed as limiting the scope of protection of this invention; the scope of protection of this invention should be determined by the claims, and the description can be used to interpret the claims.

Claims

1. A membrane treatment system for emulsion wastewater, comprising a treatment base frame (1) and a pretreatment frame (2), wherein the pretreatment frame (2) is fixedly disposed on top of the treatment base frame (1), characterized in that, A partition frame (6) is fixedly installed in the middle of the pretreatment frame (2), and a flocculation tank (4) is fixedly installed on the left side of the partition frame (6), and an air flotation tank (5) is fixedly installed on the right side of the partition frame (6). A filter tube mounting frame (35) is fixedly installed inside the treatment base frame (1), and a number of filter chambers (39) are provided inside the filter tube mounting frame (35). A number of mounting rings (40) are fixedly installed inside each of the filter chambers (39), and ceramic membrane filter tubes are movably installed inside each of the filter chambers (39). (37) Each of the filter chambers (39) has a detachable cover plate (41) that is rotatably mounted on one side via a hinge. A feed pipe (3) is fixedly mounted on the upper left side of the pretreatment frame (2), and one end of the feed pipe (3) is connected to the interior of the flocculation tank (4). A flocculation assembly is provided inside the flocculation tank (4). The flocculation assembly includes a drive frame fixedly mounted on the upper part of the flocculation tank (4) and a first stirring paddle (10), a second stirring paddle (11) and a third stirring paddle (12) that rotate inside the flocculation tank (4).

2. The emulsion wastewater membrane treatment system according to claim 1, characterized in that, The first stirring paddle (10) is rotatably arranged on the left side inside the drive frame, and a drive gear (13) is fixedly arranged above the surface of the first stirring paddle (10). A flocculation control motor (9) is fixedly arranged on the top of the flocculation tank (4), and the bottom end of the output shaft of the flocculation control motor (9) is fixedly connected to the top end of the first stirring paddle (10) through a coupling. A transmission gear (14) is rotatably arranged inside the drive frame, and the surface of the transmission gear (14) meshes with the surface of the drive gear (13). A second stirring paddle (11) is rotatably arranged on the right side inside the drive frame, and a sprocket (15) is fixedly arranged on the top end of the second stirring paddle (11) and the top end of the transmission gear (14). The surfaces of the two sprockets (15) are connected by a chain drive.

3. The emulsion wastewater membrane treatment system according to claim 1, characterized in that, A connecting frame (16) is fixedly installed on one side of the flocculation tank (4), and connecting grooves (17) are provided on both the upper and lower sides of the connecting frame (16). The upper connecting groove (17) is rotatably connected to the bottom end of the second stirring paddle (11), and a third stirring paddle (12) is rotatably installed inside the lower connecting groove (17). The bottom end of the second stirring paddle (11) extends into the interior of the lower connecting groove (17), and a second driving gear (18) is fixedly installed at the bottom end of the second stirring paddle (11). A second transmission gear (19) is also rotatably installed inside the lower connecting groove (17). A mating internal gear ring (20) is fixedly installed at the top end of the third stirring paddle (12). The tooth surfaces of the second transmission gear (19) mesh with the surface of the second driving gear (18) and the inner surface of the mating internal gear ring (20) respectively.

4. The emulsion wastewater membrane treatment system according to claim 1, characterized in that, An arc-shaped permanent magnet plate (21) is fixedly installed at the bottom of the flocculation tank (4), and a spiral sludge discharge pipe (7) is fixedly installed at the bottom of the flocculation tank (4). A scraper motor (22) is fixedly installed on one side of the spiral sludge discharge pipe (7), and a scraper plate (23) is fixedly installed at the top of the output shaft of the scraper motor (22). A scraping gap is left between the bottom of the scraper plate (23) and the upper end face of the arc-shaped permanent magnet plate (21). A feeding circulation pump (8) is also fixedly installed at the bottom of the pretreatment frame (2), and the feed end of the feeding circulation pump (8) is connected to one side of the spiral sludge discharge pipe (7). The discharge end of the feeding circulation pump (8) is connected to the interior of the air flotation tank (5) through a conveying pipe.

5. The emulsion wastewater membrane treatment system according to claim 1, characterized in that, The bottom end of the flotation tank (5) is fixedly provided with a guide pipe (29), and the bottom end of the guide pipe (29) extends into the interior of the processing base frame (1). The upper part of the interior of the processing base frame (1) is fixedly provided with a return circulation pump (30), and the feed end of the return circulation pump (30) is connected to one end of the guide pipe (29). The discharge end of the return circulation pump (30) is connected to a return pipe (31), and one end of the return pipe (31) is connected to the interior of the flocculation tank (4).

6. The emulsion wastewater membrane treatment system according to claim 1, characterized in that, An aeration disc (24) is fixedly installed at the bottom inside the flotation tank (5), and a microbubble generator (25) is also fixedly installed at the bottom inside the flotation tank (5). A waste oil storage rack (26) is fixedly installed at the top inside the flotation tank (5), and an oil scraper (27) is rotatably installed on the top of the waste oil storage rack (26). An oil scraping control motor (28) is fixedly installed on the top of the flotation tank (5), and the bottom end of the output shaft of the oil scraping control motor (28) is fixedly connected to the top of the oil scraper (27).

7. The emulsion wastewater membrane treatment system according to claim 1, characterized in that, The bottom of the filter tube mounting frame (35) is also fixedly provided with a drain rack (36), and the interior of the drain rack (36) is connected to the interior of several filter chambers (39); a variable frequency centrifugal pump (38) is fixedly provided on the right side of several filter chambers (39), and the discharge end of several variable frequency centrifugal pumps (38) is connected to the right end of several ceramic membrane filter tubes (37); a filter frame (33) is also fixedly provided on the right side inside the processing base frame (1), and a filter plate (34) is slidably provided inside the filter frame (33).

8. The emulsion wastewater membrane treatment system according to claim 7, characterized in that, The feed ends of several variable frequency centrifugal pumps (38) are connected to the left side of the filter frame (33), and a feed pipe (32) is fixedly installed on the right side of the filter frame (33). One end of the feed pipe (32) is connected to one end of the guide pipe (29), and an automatic control valve is installed at the connection between the feed pipe (32) and the guide pipe (29).

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