Energy-saving zero-emission water treatment and recycling system and method for spunlace non-woven fabric

Abstract

The invention discloses a spunlace non-woven fabric energy-saving zero-discharge water treatment and cyclic utilization system and a method thereof, and particularly relates to the technical field of water treatment and cyclic utilization. The pretreatment mechanism comprises a filter box, a first filter plate, a second filter plate, a first return pipe, a second return pipe, a pressure valve and a backwashing nozzle, the inner wall of the top of the filter box is connected with the first filter plate, the bottom of the first filter plate is provided with the second filter plate, and the outer wall of one end of the bottom of the filter box is communicated with the first return pipe; a second backflow pipe is arranged on the side, away from the first backflow pipe, of the filter box. According to the device, the back washing effect is achieved through internal inflow water backflow when the second backflow pipe and the first backflow pipe are blocked, cleaning work is carried out under the limiting condition, the filtering process is prevented from being affected by blocking, cleaning work can be carried out under the non-stop condition, and cleaning work of the two sets of filter plates can be completed without a power mechanism.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment and recycling, and more specifically, to an energy-saving and zero-emission water treatment and recycling system and method for spunlace nonwoven fabrics. Background Art

[0002] Spunlace nonwoven fabric is also called "jet spunlace fabric". The concept of "jet spunlace fabric" comes from the mechanical needle punching process. The so-called "jet spunlace" is to use high-pressure water flow to penetrate into the fiber web, so that the fibers are entangled with each other, so that the originally loose fiber web has a certain strength and complete structure. It can be seen that a large amount of water is needed in the production process of spunlace nonwoven fabrics. The wastewater after spraying contains a large amount of fibers, oils, impurity particles, pigments, etc. If it is discharged directly, it will not only cause a waste of water resources, but also pollute the water body. If it is purified and recycled, it can effectively save water resources. However, the cleanliness of the existing recycled water is poor, which greatly increases the probability of clogging of the spunlace machine and reduces production efficiency. After searching, the existing patent publication number: CN115572022A discloses a water circulation treatment system for the production process of spunlace nonwovens, and the present invention relates to the field of water circulation treatment technology. In this water circulation treatment system for the production process of spunlace nonwovens, the raw water is treated by flocculation and flotation to remove the emulsified oil stains and most of the fibers and short fibers in the water, and then treated by multi-stage quartz sand, filters, metal filters, and two-stage bag filters. Finally, the treated water that meets the standards is reused in the production of the spunlace process system. This process is energy-saving and efficient, highly reliable, and easy to maintain. It fully meets the water use indicators of the spunlace process and solves the problems of large water consumption for spunlace nonwovens, high washing out of short fiber impurities, and short process water circulation period. In the process of realizing this application, the inventor found that the prior art has the following problems: The existing spunlace nonwoven production process water circulation treatment system often does not have the function of automatically cleaning multiple filter plates of the filter screen in the primary filtration process of wastewater. At the same time, during the flotation stage of wastewater, it often does not have the function of enhancing the mixing and fusion of bubbles and wastewater. At the same time, the scraping of floating impurities, the cleaning of the inner wall and the enhancement of water-gas fusion are often driven by separate groups of structures, and cannot be driven by a group of driving mechanisms, so the energy-saving effect is not obvious. Therefore, in order to solve the above problems, an energy-saving and zero-emission water treatment and recycling system and method for spunlace nonwoven fabrics are proposed. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present application provides an energy-saving zero-discharge water treatment and recycling system for spunlace nonwoven fabrics and a method thereof to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a spunlace non-woven fabric energy-saving zero-emission water treatment and recycling system, the drainage end of the wastewater collection pool is connected to a pretreatment mechanism through a No. 1 guide pipe, the pretreatment mechanism includes a filter box, a No. 1 filter plate, a No. 2 filter plate, a No. 1 return pipe, a No. 2 return pipe, a pressure valve and a backwash nozzle, the top inner wall of the filter box is connected to the No. 1 filter plate, the bottom of the No. 1 filter plate is provided with a No. 2 filter plate, the outer wall of one end of the bottom of the filter box is connected to the No. 1 return pipe, the water inlet of the No. 1 return pipe is provided on the top side of the No. 1 filter plate, the bottom end of the No. 1 return pipe passes through the interior of the filter box and extends to the bottom side of the No. 1 filter plate, A No. 2 return pipe is arranged on the side of the filter box away from the No. 1 return pipe, the water inlet end of the No. 2 return pipe is arranged on the top side of the No. 2 filter plate, the bottom end of the No. 2 return pipe passes through the interior of the filter box and extends to the bottom side of the No. 2 filter plate, the middle parts of the No. 1 return pipe and the No. 2 return pipe are both provided with pressure valves, the output ends of the No. 1 return pipe and the No. 2 return pipe are both connected with backwash nozzles, an auxiliary filter plate is arranged at the bottom of the No. 2 filter plate, an auxiliary flushing head is arranged at the bottom of the bottom of the No. 2 return pipe close to the backwash nozzle, an auxiliary pressure valve is arranged at the connection between the auxiliary flushing head and the No. 2 return pipe, and a one-way valve is arranged on the bottom side of the No. 2 return pipe.

[0005] Preferably, the water outlet end of the filter box is connected to a sedimentation tank through a No. 2 guide pipe, and the drainage end of the sedimentation tank is also connected to a flotation tank through a No. 2 guide pipe. The outer walls on both sides of the top of the flotation tank are connected to a fixed frame, the middle part of the fixed frame is connected to a screw through a bearing, the middle outer wall of the screw is threadedly connected to a moving block, the top of the moving block is connected to a connecting frame through bolts, and electric telescopic rods are arranged and connected on both sides of the bottom inner wall of the connecting frame, and the bottom end of the electric telescopic rod is connected to a scraper floating plate.

[0006] Preferably, a servo motor is connected to an outer wall of one side of the fixed frame, and the output end of the servo motor is connected to a screw rod. The servo motor drives the screw rod to rotate, and the rotation of the screw rod drives the moving block to perform translational movement. The movement of the moving block drives the connecting frame, the electric telescopic rod and the scraper floating plate to perform synchronous translational movement.

[0007] Preferably, a scraper frame is connected to the inner wall of the movable block, the outer wall of the scraper frame abuts against the inner wall of the flotation tank, limiting grooves are provided on the top inner walls on both sides of the scraper frame, and the outer walls on both sides of the scraper plate are connected to limiting blocks, and the limiting blocks are embedded in the limiting grooves.

[0008] Preferably, the middle inner wall of the scraper frame is connected to a connecting sleeve, and the inner wall of one side of the middle part of the flotation tank is connected to a screw rod through a bearing. The screw rod passes through the connecting sleeve and is threadedly connected to the connecting sleeve. The outer wall of one end of the screw rod extends to the outside of the flotation tank and is connected to a No. 1 gear. A rotating rod is provided on the top of the screw rod, and the rotating rod is also connected to the inner wall of the flotation tank through a bearing.

[0009] Preferably, the outer wall of one end of the rotating rod extends to the outside of the flotation tank and is connected to the second gear, the first gear and the second gear are connected by a transmission toothed belt, the outer wall of the rotating rod is arranged with stirring blades, the outer wall of one side of the flotation tank is provided with a sewage collecting trough, the outer wall of the sewage collecting trough close to the scraper is inclined, an air storage tank is provided on one side of the flotation tank, the air outlet end of the air storage tank is connected to an air pipe, and the end of the air pipe away from the air storage tank extends to the inside of the flotation tank and is provided with an air outlet nozzle.

[0010] Preferably, the water outlet end of the flotation tank is connected to a No. 3 guide pipe, and the end of the No. 3 guide pipe away from the flotation tank is connected to a filter sand tank, and the filter sand tank, the inside of which is sequentially provided with a modified PP fiber ball layer, an activated carbon quartz sand mixed layer and a magnetite layer from top to bottom, a No. 1 partition filter plate is provided between the modified PP fiber ball layer and the activated carbon quartz sand mixed layer, and a No. 2 partition filter plate is provided between the activated carbon quartz sand mixed layer and the magnetite layer.

[0011] Preferably, pressure sensors are provided on the upper and lower outer walls of the No. 1 partition filter plate and the No. 2 partition filter plate, the water outlet end of the filter sand tank is connected to a detection pool through a No. 3 guide pipe, a drain outlet is provided at one end of the detection pool, and water pumps are provided in the middle of the No. 1 guide pipe, the No. 2 guide pipe and the No. 3 guide pipe.

[0012] The method comprises the following steps: Step 1: First, the wastewater from the production process of spunlace non-woven fabrics is diverted to the wastewater collection pool for collection. Then, the wastewater collection pool diverts the wastewater to the inside of the filter box through the No. 1 diversion pipe. The wastewater passes through the No. 1 filter plate and the No. 2 filter plate for preliminary filtration in turn. The aperture of the No. 1 filter plate is larger than that of the No. 2 filter plate, and the aperture of the auxiliary filter plate is equivalent to that of the No. 2 filter plate. During the filtration process, when the No. 1 filter plate is blocked by impurities, the wastewater on the top of the No. 1 filter plate gradually accumulates, so that the water pressure gradually increases. When it increases to a certain extent, the pressure valve inside the No. 1 return pipe opens, so that the sewage bypasses the No. 1 filter plate through the No. 1 return pipe and is sprayed out through the backwash nozzle at the bottom of the No. 1 filter plate, thereby backwashing the No. 1 filter plate. After the blockage of the No. 1 filter plate is flushed away, the original flow mode is restored. The pressure valve automatically closes after the pressure is reduced. The No. 2 return pipe and the No. 1 return pipe work on the No. 2 filter plate in the same principle as the No. 1 return pipe to prevent blockage. Step 2: During the backwashing process through the No. 2 return pipe, the wastewater flowing through the No. 2 return pipe and then flowing to the bottom of the No. 2 filter plate is filtered through the auxiliary filter plate to ensure the wastewater filtering effect. The auxiliary filter plate is inclined. When the auxiliary filter plate is blocked by impurities, the water gradually accumulates. When it accumulates to the top of the No. 2 filter plate, the pressure valve opens, thereby pressurizing the auxiliary pressure valve. The auxiliary pressure valve is opened under pressure to flush the top of the auxiliary filter plate. The auxiliary filter plate is inclined, and the impurities will be pushed from high to low, thereby eliminating the blockage of the auxiliary filter plate. Step 3: After passing through the filter box, the wastewater is guided to the sedimentation tank through the No. 2 guide pipe, filtered and discharged after sedimentation in the sedimentation tank, and discharged to the flotation tank through the No. 2 guide pipe for flotation treatment. The flotation tank is exhausted through the gas storage tank, and enters the flotation tank through the air pipe and the air outlet nozzle. When the gas pressure drops suddenly, the air dissolved in the water is quickly released as tiny bubbles of 20-50 microns. After the tiny bubbles collide with the flocs, they are attached to the surface of the pollutants through surface tension, van der Waals force or charge action to form a bubble-floc complex. The density of the bubble-floc complex is less than that of water, and it quickly floats to the water surface to form a scum layer; Step 4: The servo motor drives the screw to rotate, and the screw rotation drives the moving block to perform translational motion. The movement of the moving block drives the connecting frame, the electric telescopic rod and the scraper plate to perform synchronous translational motion. The scraper plate is used to reciprocate to scrape the scum on the surface of the flotation tank into the sewage collection tank. During the scraping process, the height of the scraper plate is controlled by the electric telescopic rod so that it can be scraped accurately in the direction of the sewage collection tank. Step 5: The moving block drives the scraper plate to move while driving the scraper frame to move synchronously. The reciprocating motion of the scraper frame can scrape the inner wall of the flotation tank to prevent sewage impurities from adhering to the inner wall and being difficult to remove. The movement of the scraper frame drives the connecting sleeve to move synchronously back and forth. The movement of the connecting sleeve drives the screw rod to rotate. The rotation of the screw rod drives the No. 1 gear to rotate synchronously. The rotation of the No. 1 gear drives the transmission toothed belt to rotate, thereby driving the No. 2 gear to rotate. The rotation of the No. 2 gear drives the rotating rod to rotate synchronously. The rotation of the rotating rod drives the stirring blade to rotate, thereby stirring the inside of the flotation tank. Step 6: After flotation, the water is diverted to the sand filter tank through the No. 3 diversion pipe for further sand filtering treatment. After sand filtering, it is diverted to the detection pool for water quality testing. After passing the water quality test, it can be recirculated to the spunlace non-woven fabric production process. If the water quality does not pass, repeat the secondary treatment work.

[0013] Technical effects and advantages of this application: 1. Compared with the prior art, the spunlace nonwoven energy-saving zero-emission water treatment recycling system and method thereof can achieve a backwashing effect by allowing water to flow back through the internal water inlet of the No. 2 return pipe and the No. 1 return pipe when the No. 1 filter plate or the No. 2 filter plate is blocked during the filtration process. This is a cleaning work under extreme conditions to avoid blockage affecting the filtration process. The cleaning work can be performed without stopping the machine, and the cleaning work of the two sets of filter plates can be completed without a power mechanism, realizing unpowered cleaning work, thereby further improving the energy saving of the device.

[0014] 2. Compared with the prior art, the energy-saving and zero-emission water treatment recycling system and method of the spunlace nonwoven fabric drives the first gear to rotate synchronously by rotating the rotating rod, and the rotation of the first gear drives the transmission belt to rotate, thereby driving the second gear to rotate, and the rotation of the second gear drives the rotating rod to rotate synchronously, and the rotation of the rotating rod drives the stirring blade to rotate, thereby stirring the inside of the flotation tank. The stirring of the stirring blade can stir the stirring shaft inside the flotation tank, and the stirring can enhance the turbulence of the water flow, make the pollutants and bubbles more evenly distributed, reduce the local concentration difference, and increase the probability of bubble collision. At the same time, it can avoid the deposition of flocculants at the bottom of the tank, maintain its suspended state, and prolong the contact time with the bubbles. Each group of flotation tanks operates independently, and the water inlet is balanced through the flow distributor. A single group of servo motors can drive the scraper to scrape and clean the inner wall of the flotation tank at the same time, and drive the stirring blade to stir. There is no need to rely on multiple groups of driving mechanisms to achieve the same effect, thereby achieving certain energy saving for the recycling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of this application.

[0016] Figure 2 This is a schematic diagram of the internal structure of the pre-processing organization for this application; Figure 3 This is a schematic diagram of the connection structure of the flotation tank for this application; Figure 4 This is a schematic diagram of the water treatment circulation connection structure of this application; Figure 5 This is a schematic diagram of the top view of the flotation tank of this application; Figure 6 This is a schematic diagram of the internal structure of the flotation tank of the present application; Figure 7 This is a schematic diagram of the internal structure of the flotation tank of the present application from a side view; Figure 8 This is a schematic diagram of the structure of the sand filter tank of this application.

[0017] The accompanying drawings are marked as follows: 1, wastewater collection tank; 2, No. 1 guide pipe; 3, pretreatment mechanism; 4, filter box; 5, No. 1 filter plate; 6, No. 2 filter plate; 7, No. 1 return pipe; 8, No. 2 return pipe; 9, pressure valve; 10, backwash nozzle; 11, auxiliary filter plate; 12, auxiliary flushing head; 13, auxiliary pressure valve; 131, one-way valve; 14, No. 2 guide pipe; 15, sedimentation tank; 16, flotation tank; 17, fixed frame; 18, screw; 19, moving block; 20, connecting frame; 201, electric telescopic rod; 21, scraper float; 22, servo motor; 23, Scraper frame; 24. Limiting groove; 25. Limiting block; 26. Connecting sleeve; 27. Screw rod; 28. Gear No. 1; 29. ​​Rotating rod; 30. Gear No. 2; 31. Transmission belt; 32. Stirring blade; 33. Sewage collecting tank; 34. Gas storage tank; 35. Air pipe; 36. Air outlet nozzle; 37. No. 3 guide pipe; 38. Filter sand tank; 39. Fiber ball layer; 40. Activated carbon quartz sand mixed layer; 41. Magnetite layer; 42. No. 1 partition filter plate; 43. No. 2 partition filter plate; 44. Pressure sensor; 45. Detection tank; 46. Drain outlet; 47. Water pump. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Example 1

[0019] As attached Figures 1 to 8The energy-saving and zero-emission water treatment and recycling system of spunlace nonwoven fabrics shown in the figure comprises a wastewater collection pool 1, the drainage end of the wastewater collection pool 1 is connected to a pretreatment mechanism 3 through a No. 1 guide pipe 2, the pretreatment mechanism 3 comprises a filter box 4, a No. 1 filter plate 5, a No. 2 filter plate 6, a No. 1 return pipe 7, a No. 2 return pipe 8, a pressure valve 9 and a backwash nozzle 10, the top inner wall of the filter box 4 is connected to the No. 1 filter plate 5, the bottom of the No. 1 filter plate 5 is provided with a No. 2 filter plate 6, the outer wall of one end of the bottom of the filter box 4 is connected to the No. 1 return pipe 7, the water inlet of the No. 1 return pipe 7 is provided on one side of the top of the No. 1 filter plate 5, the bottom end of the No. 1 return pipe 7 passes through the interior of the filter box 4 and extends to one side of the bottom end of the No. 1 filter plate 5, and the filter box 4 is away from one. A No. 2 return pipe 8 is arranged on one side of the No. 1 return pipe 7, the water inlet end of the No. 2 return pipe 8 is arranged on one side of the top of the No. 2 filter plate 6, the bottom end of the No. 2 return pipe 8 passes through the interior of the filter box 4 and extends to one side of the bottom end of the No. 2 filter plate 6, a pressure valve 9 is arranged in the middle of the No. 1 return pipe 7 and the No. 2 return pipe 8, the output ends of the No. 1 return pipe 7 and the No. 2 return pipe 8 are connected to a backwash nozzle 10, an auxiliary filter plate 11 is arranged at the bottom of the No. 2 filter plate 6, an auxiliary flushing head 12 is arranged at the bottom of the No. 2 return pipe 8 near the backwash nozzle 10, an auxiliary pressure valve 13 is arranged at the connection between the auxiliary flushing head 12 and the No. 2 return pipe 8, and a one-way valve 131 is arranged on one side of the bottom end of the No. 2 return pipe 8; Among them, the wastewater collection pool 1 collects the wastewater discharged from the spunlace non-woven fabric production system, and then the wastewater collection pool 1 guides the wastewater to the inside of the filter box 4 through the No. 1 guide pipe 2. The wastewater is initially filtered through the No. 1 filter plate 5 and the No. 2 filter plate 6 in turn. The aperture of the No. 1 filter plate 5 is larger than that of the No. 2 filter plate 6, and the aperture of the auxiliary filter plate 11 is equivalent to that of the No. 2 filter plate 6. During the filtration process, when the No. 1 filter plate 5 is blocked by impurities, the wastewater on the top of the No. 1 filter plate 5 gradually accumulates, thereby gradually increasing the water pressure. When it increases to a certain extent, the No. 1 reflux pipe The pressure valve 9 inside 7 is opened, so that the sewage passes through the No. 1 return pipe 7 to bypass the No. 1 filter plate 5 and then is sprayed out through the backwash nozzle 10 at the bottom of the No. 1 filter plate 5. The diameter of the backwash nozzle 10 gradually narrows toward the water outlet end, and the Bernoulli principle is used to increase the water flow rate during flushing, so as to backwash the No. 1 filter plate 5. After the blockage of the No. 1 filter plate 5 is flushed away, the original flow mode is restored. The pressure valve 9 is automatically closed after the pressure is reduced. The No. 2 return pipe 8 and the No. 1 return pipe 7 work on the No. 2 filter plate 6 to prevent blocking in accordance with the principle. The No. 2 return pipe 8 and the interior of the No. 1 return pipe 7, so that the pipe diameter from the water inlet end to the water outlet end is further narrowed, thereby achieving the effect of accelerated flushing. This is the cleaning work under extreme conditions to avoid blockage affecting the filtering process. The cleaning work can be performed without stopping the machine. During the backwashing process through the No. 2 return pipe 8, the wastewater flowing through the No. 2 return pipe 8 and then flowing to the bottom of the No. 2 filter plate 6 is filtered by the auxiliary filter plate 11 to ensure the wastewater filtering effect. The auxiliary filter plate 11 is inclined. When the auxiliary filter plate 11 is blocked by impurities, the water flow gradually accumulates and the No. 2 return pipe 8 is blocked. The one-way valve 131 of the pipe 8 realizes the function of preventing sewage from entering the No. 2 return pipe 8 through the bottom. When the sewage accumulates to the top of the No. 2 filter plate 6, the pressure valve 9 opens, thereby pressurizing the auxiliary pressure valve 13. The auxiliary pressure valve 13 opens under pressure to flush the top of the auxiliary filter plate 11. The auxiliary filter plate 11 is inclined and impurities will be pushed from high to low, thereby eliminating the blockage of the auxiliary filter plate 11. The cleaning work of the two sets of filter plates can be completed without a power mechanism, thereby realizing unpowered cleaning work, thereby further improving the energy saving performance of the device. Example 2

[0020] Based on Example 1, the solution in Example 1 is further detailed in combination with the following specific working method. Figures 1 to 8 As shown, see the following description for details: As a preferred embodiment, the water outlet end of the filter box 4 is connected to the sedimentation tank 15 through the No. 2 guide pipe 14, and the drainage end of the sedimentation tank 15 is also connected to the flotation tank 16 through the No. 2 guide pipe 14. The outer walls on both sides of the top of the flotation tank 16 are connected with a fixing frame 17, and the middle part of the fixing frame 17 is connected with a screw 18 through a bearing. The middle outer wall of the screw 18 is threadedly connected with a moving block 19, and the top of the moving block 19 is connected with a connecting frame 20 through bolts. Electric telescopic rods 201 are arranged on both sides of the inner wall of the bottom of the connecting frame 20, and the bottom end of the electric telescopic rod 201 is connected with a scraper floating plate 21. Among them, the filtered wastewater can be precipitated through the sedimentation tank 15 to achieve further purification effect, and then flotation treatment is carried out through the flotation tank 16. The screw 18 rotates to drive the moving block 19 to perform translational movement. The moving block 19 moves to drive the connecting frame 20, the electric telescopic rod 201 and the scraper flotation plate 21 to perform synchronous translational movement. The scraper flotation plate 21 reciprocates to scrape the scum on the surface of the flotation tank 16 into the sewage collecting tank 33. During the scraping process, the height of the scraper flotation plate 21 is controlled by the electric telescopic rod 201 so that it can be accurately scraped toward the sewage collecting tank 33.

[0021] As a preferred embodiment, a servo motor 22 is connected to the outer wall of one side of the fixed frame 17, and the output end of the servo motor 22 is connected to the screw 18. The servo motor 22 drives the screw 18 to rotate, and the rotation of the screw 18 drives the moving block 19 to perform translational movement. The movement of the moving block 19 drives the connecting frame 20, the electric telescopic rod 201 and the scraper floating plate 21 to perform synchronous translational movement. The servo motor 22 plays a driving role and can drive the screw 18 to rotate to achieve subsequent scraping work.

[0022] As a preferred embodiment, a scraper frame 23 is connected to the inner wall of the moving block 19, and the outer wall of the scraper frame 23 is in contact with the inner wall of the flotation tank 16. Limiting grooves 24 are provided on the top inner walls on both sides of the scraper frame 23, and the outer walls on both sides of the scraper plate 21 are connected to limiting blocks 25, and the limiting blocks 25 are embedded in the limiting grooves 24. The outer wall of the scraper frame 23 is in the shape of a scraper, and the inner wall of the flotation tank 16 is scraped back and forth during the reciprocating translation process to prevent impurities from falling to the bottom or adhering to the side wall during the flotation process and being difficult to clean. The limiting blocks 25 are embedded in the limiting grooves 24 so that the scraper plate 21 can be limited to a certain extent during the lifting and lowering movement.

[0023] As a preferred embodiment, the middle inner wall of the scraper frame 23 is connected to a connecting sleeve 26, and the inner wall of one side of the middle part of the flotation tank 16 is connected to a screw rod 27 through a bearing. The screw rod 27 passes through the connecting sleeve 26 and is threadedly connected to the connecting sleeve 26. The outer wall of one end of the screw rod 27 extends to the outside of the flotation tank 16 and is connected to a No. 1 gear 28. A rotating rod 29 is provided on the top of the screw rod 27. The rotating rod 29 is also connected to the inner wall of the flotation tank 16 through a bearing. When the scraper frame 23 moves, it drives the connecting sleeve 26 to perform synchronous reciprocating translation. The movement of the connecting sleeve 26 drives the screw rod 27 to rotate. The helix angle between the screw rod 27 and the connecting sleeve 26 is large and does not have self-locking properties. Therefore, the connecting sleeve 26 can drive the screw rod 27 to rotate during the translation process.

[0024] As a preferred embodiment, the outer wall of one end of the rotating rod 29 extends to the outside of the flotation tank 16 and is connected to the second gear 30. The first gear 28 is connected to the second gear 30 through a transmission toothed belt 31. The outer wall of the rotating rod 29 is arranged with stirring blades 32. A sewage collecting tank 33 is provided on one side of the outer wall of the flotation tank 16. The outer wall of the sewage collecting tank 33 on the side close to the scraper 21 is in the shape of an inclined surface. An air storage tank 34 is provided on one side of the flotation tank 16. The air outlet end of the air storage tank 34 is connected to an air pipe 35. The end of the air pipe 35 away from the air storage tank 34 extends to the inside of the flotation tank 16 and is provided with an air outlet nozzle 36. The rotating rod 29 rotates to drive the first gear 28 to rotate synchronously. The rotation of the first gear 28 drives the transmission toothed belt 31 to rotate, thereby driving the second gear 30 to rotate. The second gear 30 rotates with the belt The rotating rod 29 rotates synchronously, and the rotation of the rotating rod 29 drives the stirring blade 32 to rotate, thereby stirring the inside of the flotation tank 16. The stirring of the stirring blade 32 can stir the stirring shaft inside the flotation tank 16. The stirring can enhance the turbulence of the water flow, make the pollutants and bubbles more evenly distributed, reduce the local concentration difference, increase the probability of bubble collision, and at the same time avoid the deposition of flocculants at the bottom of the tank, maintain its suspended state, and prolong the contact time with the bubbles. Each group of flotation tanks 16 operates independently, and the water is evenly inlet through the flow distributor. A single group of servo motors 22 can drive the scraper 21 to scrape and clean the inner wall of the flotation tank 16, and drive the stirring blade 32 to stir at the same time. There is no need to rely on multiple groups of driving mechanisms to achieve the same effect, thereby achieving a certain energy saving for the recycling system.

[0025] As a preferred embodiment, the outlet end of the flotation tank 16 is connected to a No. 3 guide pipe 37, and the end of the No. 3 guide pipe 37 away from the flotation tank 16 is connected to a filter sand tank 38, and the filter sand tank 38 has a modified PP fiber ball layer 39, an activated carbon quartz sand mixed layer 40 and a magnetite layer 41 arranged in sequence from top to bottom. A No. 1 separation filter plate 42 is arranged between the modified PP fiber ball layer 39 and the activated carbon quartz sand mixed layer 40, and the activated carbon quartz sand mixed layer 40 and the magnetite layer A No. 2 separation filter plate 43 is arranged between 41, wherein the interior of the filter sand tank 38 is separated step by step by the No. 1 separation filter plate 42 and the No. 2 separation filter plate 43, which can be cleaned or replaced separately without affecting other layers, thereby reducing maintenance costs, reducing downtime, avoiding cross contamination of filter materials, ensuring the specialization of each function, and at the same time avoiding the modified PP fiber ball layer 39, the activated carbon quartz sand mixed layer 40 and the magnetite layer 41 from mixing after backwashing to affect the filtering effect during the backwashing process.

[0026] As a preferred embodiment, pressure sensors 44 are provided on the upper and lower outer walls of the No. 1 partition filter plate 42 and the No. 2 partition filter plate 43, the water outlet end of the filter sand tank 38 is connected to the detection pool 45 through the No. 3 guide pipe 37, and a drain outlet 46 is provided at one end of the detection pool 45. The No. 1 guide pipe 2, the No. 2 guide pipe 14 and the No. 3 guide pipe 37 are all provided with a water pump 47 in the middle part, wherein the No. 1 guide pipe 2, the No. 2 guide pipe 14 and the No. 3 guide pipe 37 can sequentially transmit the wastewater through the water pump 47, and the pressure level of each layer can be monitored in real time through the pressure sensor 44, and timely monitoring and reminder can be carried out after blockage to avoid the blockage of the No. 1 partition filter plate 42 and the No. 2 partition filter plate 43 affecting the water circulation, and the treated water quality can be detected by various sensors inside the detection pool 45. The water quality detection process is an existing mature detection technology. After passing the detection, the water is discharged through the water outlet and circulated to the spunlace non-woven fabric production process.

[0027] The method comprises the following steps: Step 1: First, the wastewater in the production process of spunlace non-woven fabrics is diverted to the wastewater collection pool 1 for collection. Then, the wastewater collection pool 1 diverts the wastewater to the inside of the filter box 4 through the No. 1 diversion pipe 2. The wastewater is sequentially filtered through the No. 1 filter plate 5 and the No. 2 filter plate 6. The aperture of the No. 1 filter plate 5 is larger than that of the No. 2 filter plate 6, and the aperture of the auxiliary filter plate 11 is equivalent to that of the No. 2 filter plate 6. During the filtration process, when the No. 1 filter plate 5 is blocked by impurities, the wastewater on the top of the No. 1 filter plate 5 gradually accumulates from The water pressure gradually increases. When it increases to a certain level, the pressure valve 9 inside the No. 1 return pipe 7 opens, so that the sewage passes through the No. 1 return pipe 7, bypasses the No. 1 filter plate 5, and is ejected through the backwash nozzle 10 at the bottom of the No. 1 filter plate 5, so as to backwash the No. 1 filter plate 5. After the blockage of the No. 1 filter plate 5 is flushed away, the original flow mode is restored. The pressure valve 9 automatically closes after the pressure is reduced. The No. 2 return pipe 8 and the No. 1 return pipe 7 work on the No. 2 filter plate 6 in the same principle to prevent blockage. Step 2: During the backwashing process through the No. 2 return pipe 8, the wastewater flowing to the bottom of the No. 2 filter plate 6 after passing through the No. 2 return pipe 8 is filtered through the auxiliary filter plate 11 to ensure the wastewater filtering effect. The auxiliary filter plate 11 is inclined. When the auxiliary filter plate 11 is blocked by impurities, the water gradually accumulates. When it accumulates to the top of the No. 2 filter plate 6, the pressure valve 9 opens, thereby pressurizing the auxiliary pressure valve 13. The auxiliary pressure valve 13 is opened under pressure to flush the top of the auxiliary filter plate 11. The auxiliary filter plate 11 is inclined, and the impurities will be pushed from high to low, thereby eliminating the blockage of the auxiliary filter plate 11. Step 3: After passing through the filter box 4, the wastewater is guided to the sedimentation tank 15 through the No. 2 guide pipe 14, filtered and discharged after sedimentation in the sedimentation tank 15, and discharged to the flotation tank 16 through the No. 2 guide pipe 14 for flotation treatment. The flotation tank 16 is exhausted through the gas storage tank 34, and enters the flotation tank 16 through the air pipe 35 and the air outlet nozzle 36. When the gas pressure drops suddenly, the air dissolved in the water is quickly released as tiny bubbles of 20-50 microns. After the tiny bubbles collide with the flocs, they are attached to the surface of the pollutants through surface tension, van der Waals force or charge action to form a bubble-floc complex. The density of the bubble-floc complex is less than that of water, and it quickly floats to the water surface to form a scum layer; Step 4: The servo motor 22 drives the screw 18 to rotate, and the rotation of the screw 18 drives the moving block 19 to perform translational motion. The moving block 19 drives the connecting frame 20, the electric telescopic rod 201 and the scraper 21 to perform synchronous translational motion. The scraper 21 performs reciprocating motion to scrape the scum on the surface of the flotation tank 16 into the sewage collection tank 33. During the scraping process, the height of the scraper 21 is controlled by the electric telescopic rod 201 so that it can be scraped accurately toward the sewage collection tank 33. Step 5: The moving block 19 drives the scraper plate 21 to move and drives the scraper frame 23 to move synchronously. The reciprocating motion of the scraper frame 23 can scrape the inner wall of the flotation tank 16 to prevent sewage impurities from adhering to the inner wall and being difficult to remove. The scraper frame 23 moves and drives the connecting sleeve 26 to move synchronously. The connecting sleeve 26 moves to drive the screw rod 27 to rotate. The screw rod 27 rotates to drive the first gear 28 to rotate synchronously. The first gear 28 rotates to drive the transmission toothed belt 31 to rotate, thereby driving the second gear 30 to rotate. The second gear 30 rotates to drive the rotating rod 29 to rotate synchronously. The rotating rod 29 rotates to drive the stirring blade 32 to rotate, thereby stirring the inside of the flotation tank 16. Step 6: After flotation, the water is directed through the No. 3 guide pipe 37 to the sand filter tank 38 for further sand filtering treatment. After sand filtering, it is directed to the detection tank 45 for water quality testing. After passing the water quality test, it can be recirculated to the spunlace non-woven fabric production process. If the water quality does not pass, the secondary treatment work will be repeated.

[0028] The working process of the present application is as follows: first, the wastewater in the production process of the spunlace non-woven fabric is diverted to the wastewater collection pool 1 for collection, and then the wastewater collection pool 1 diverts the wastewater to the inside of the filter box 4 through the No. 1 diversion pipe 2. The wastewater collection pool 1 collects the wastewater discharged from the spunlace non-woven fabric production system, and then the wastewater collection pool 1 diverts the wastewater to the inside of the filter box 4 through the No. 1 diversion pipe 2. The wastewater passes through the No. 1 filter plate 5 and the No. 2 filter plate 6 in turn for preliminary filtration, wherein the aperture of the No. 1 filter plate 5 is greater than During the filtering process of the No. 2 filter plate 6, when the No. 1 filter plate 5 is clogged by impurities, the wastewater on the top of the No. 1 filter plate 5 gradually accumulates, so that the water pressure gradually increases. When it increases to a certain extent, the pressure valve 9 inside the No. 1 return pipe 7 opens, so that the sewage bypasses the No. 1 filter plate 5 through the No. 1 return pipe 7 and is sprayed out through the backwash nozzle 10 at the bottom of the No. 1 filter plate 5, so as to backwash the No. 1 filter plate 5. After the blockage of the No. 1 filter plate 5 is flushed away, the original flow mode is restored. The pressure valve 9 is automatically closed after the pressure is reduced, and the No. 2 filter plate 6 is backwashed. The principle of the No. 1 return pipe 8 and the No. 1 return pipe 7 is the same to prevent the No. 2 filter plate 6 from being blocked. The diameter of the No. 2 return pipe 8 and the No. 1 return pipe 7 from the water inlet to the water outlet is further narrowed, thereby achieving the effect of accelerated flushing. This is the cleaning work under extreme conditions to avoid blockage affecting the filtration process. The cleaning work can be performed without stopping the machine. After passing through the filter box 4, the wastewater is guided to the sedimentation tank 15 through the No. 2 guide pipe 14, and is filtered and discharged after sedimentation in the sedimentation tank 15. 14 is discharged to the flotation tank 16 for flotation treatment. The air in the flotation tank 16 is exhausted through the air storage tank 34, and enters the flotation tank 16 through the air pipe 35 and the air outlet nozzle 36. When the gas pressure drops suddenly, the air dissolved in the water is quickly released as tiny bubbles of 20-50 microns. After the tiny bubbles collide with the flocs, they adhere to the surface of the pollutants through surface tension, van der Waals force or charge action to form a bubble-floc complex. The density of the bubble-floc complex is less than that of water, and it quickly floats to the water surface to form a scum layer; The servo motor 22 drives the screw 18 to rotate, and the screw 18 rotates to drive the moving block 19 to perform translational motion. The moving block 19 moves to drive the connecting frame 20, the electric telescopic rod 201 and the scraper 21 to perform synchronous translational motion. The scraper 21 reciprocates to scrape the scum on the surface of the flotation tank 16 into the sewage collection tank 33. During the scraping process, the height of the scraper 21 is controlled by the electric telescopic rod 201 so that it can be scraped accurately toward the sewage collection tank 33. Step 5: The moving block 19 drives the scraper plate 21 to move and drives the scraper frame 23 to move synchronously. The reciprocating motion of the scraper frame 23 can scrape the inner wall of the flotation tank 16 to prevent sewage impurities from adhering to the inner wall and being difficult to remove. The scraper frame 23 moves and drives the connecting sleeve 26 to move synchronously. The connecting sleeve 26 moves to drive the screw rod 27 to rotate. The screw rod 27 rotates to drive the No. 1 gear 28 to rotate synchronously. The No. 1 gear 28 rotates to drive the transmission toothed belt 31 to rotate, thereby driving the No. 2 gear 30 to rotate. The No. 2 gear 30 rotates to drive the rotating rod 29 to rotate synchronously. The rotating rod 29 rotates to drive the stirring blade 32 to rotate, thereby stirring the inside of the flotation tank 16. The stirring of the stirring blade 32 can stir the stirring shaft inside the flotation tank 16, and the stirring can enhance the turbulence of the water flow. The pollutants and bubbles are distributed more evenly, the local concentration difference is reduced, the probability of bubble collision is increased, and the flocculants are prevented from settling at the bottom of the pool, maintaining their suspended state and prolonging the contact time with the bubbles. Each group of flotation pools 16 operates independently, and the water is evenly inletted through the flow distributor. A single group of servo motors 22 can drive the scraper 21 to scrape and clean the inner wall of the flotation pool 16, and drive the stirring blades 32 to stir. There is no need to rely on multiple groups of driving mechanisms to achieve the same effect, thereby achieving certain energy saving for the recycling system. After flotation, the water is diverted to the sand filter tank 38 through the No. 3 guide pipe 37 for further sand filtering treatment. After sand filtering, the water is diverted to the detection pool 45 for water quality testing. After passing the water quality test, it can be recirculated to the spunlace non-woven fabric production process. If the water quality does not pass, the secondary treatment work will be repeated.

Claims

1. A spunlace nonwoven energy-saving zero-discharge water treatment and recycling system, comprising a wastewater collection tank (1), characterized in that: The drainage end of the wastewater collection tank (1) is connected to a pretreatment mechanism (3) via a No. 1 guide pipe (2). The pretreatment mechanism (3) comprises a filter box (4), a No. 1 filter plate (5), a No. 2 filter plate (6), a No. 1 return pipe (7), a No. 2 return pipe (8), a pressure valve (9) and a backwash nozzle (10). The top inner wall of the filter box (4) is connected to the No. 1 filter plate (5). The bottom of the No. 1 filter plate (5) is provided with a No. 2 filter plate (6). The outer wall of one end of the bottom of the filter box (4) is connected to the No. 1 return pipe (7). The water inlet of the No. 1 return pipe (7) is provided on one side of the top of the No. 1 filter plate (5). The bottom end of the No. 1 return pipe (7) passes through the interior of the filter box (4) and extends to one side of the bottom end of the No. 1 filter plate (5). The side of the filter box (4) away from the No. 1 return pipe (7) is provided with a No. 2 return pipe (7). A return pipe (8), the water inlet end of the second return pipe (8) is arranged on one side of the top of the second filter plate (6), the bottom end of the second return pipe (8) passes through the interior of the filter box (4) and extends to one side of the bottom end of the second filter plate (6), a pressure valve (9) is arranged in the middle of the first return pipe (7) and the second return pipe (8), the output ends of the first return pipe (7) and the second return pipe (8) are connected to a backwashing nozzle (10), an auxiliary filter plate (11) is arranged at the bottom end of the second filter plate (6), an auxiliary flushing head (12) is arranged at the bottom of the second return pipe (8) near the backwashing nozzle (10), an auxiliary pressure valve (13) is arranged at the connection between the auxiliary flushing head (12) and the second return pipe (8), and a one-way valve (131) is arranged on one side of the bottom end of the second return pipe (8).

2. The spunlace nonwoven energy-saving zero-discharge water treatment and recycling system according to claim 1, characterized in that: The water outlet end of the filter box (4) is connected to a sedimentation tank (15) via a No. 2 flow guide pipe (14), and the drainage end of the sedimentation tank (15) is also connected to an air flotation tank (16) via the No. 2 flow guide pipe (14). The outer walls on both sides of the top of the air flotation tank (16) are connected to a fixing frame (17), the middle of the fixing frame (17) is connected to a screw rod (18) via a bearing, the middle outer wall of the screw rod (18) is threadedly connected to a moving block (19), the top of the moving block (19) is connected to a connecting frame (20) via bolts, and the inner walls of the bottom of the connecting frame (20) are connected to electric telescopic rods (201) arranged on both sides, and the bottom end of the electric telescopic rod (201) is connected to a scraper floating plate (21).

3. The spunlace nonwoven energy-saving zero-discharge water treatment and recycling system according to claim 2, characterized in that: A servo motor (22) is connected to an outer wall of one side of the fixed frame (17); an output end of the servo motor (22) is connected to the screw rod (18); the servo motor (22) drives the screw rod (18) to rotate; the screw rod (18) rotates to drive the moving block (19) to perform translational movement; the moving block (19) moves to drive the connecting frame (20), the electric telescopic rod (201) and the scraper floating plate (21) to perform synchronous translational movement.

4. The spunlace nonwoven energy-saving zero-discharge water treatment and recycling system according to claim 3 is characterized by: A scraper frame (23) is connected to the inner wall of the moving block (19); the outer wall of the scraper frame (23) abuts against the inner wall of the flotation tank (16); limiting grooves (24) are provided on the inner walls of the tops of both sides of the scraper frame (23); the outer walls of both sides of the scraper flotation plate (21) are connected to limiting blocks (25); and the limiting blocks (25) are embedded in the limiting grooves (24).

5. The spunlace nonwoven energy-saving zero-discharge water treatment and recycling system according to claim 4 is characterized by: The scraper frame (23) has a connecting sleeve (26) connected to the inner wall of the middle part thereof. The inner wall of one side of the middle part of the flotation tank (16) is connected to a screw rod (27) via a bearing. The screw rod (27) passes through the connecting sleeve (26) and is threadedly connected to the connecting sleeve (26). The outer wall of one end of the screw rod (27) extends to the outside of the flotation tank (16) and is connected to a first gear (28). A rotating rod (29) is provided at the top of the screw rod (27). The rotating rod (29) is also connected to the inner wall of the flotation tank (16) via a bearing.

6. The spunlace nonwoven energy-saving zero-discharge water treatment and recycling system according to claim 5, characterized in that: The outer wall of one end of the rotating rod (29) extends to the outside of the flotation tank (16) and is connected to a second gear (30); the first gear (28) and the second gear (30) are connected via a transmission toothed belt (31); stirring blades (32) are arranged on the outer wall of the rotating rod (29); a dirt collecting trough (33) is arranged on the outer wall of one side of the flotation tank (16); the outer wall of the dirt collecting trough (33) on a side close to the scraper (21) is in the shape of an inclined surface; an air storage tank (34) is arranged on one side of the flotation tank (16); an air outlet end of the air storage tank (34) is connected to an air pipe (35); an end of the air pipe (35) away from the air storage tank (34) extends to the inside of the flotation tank (16) and is provided with an air outlet nozzle (36).

7. The spunlace nonwoven energy-saving zero-discharge water treatment and recycling system according to claim 6, characterized in that: The water outlet end of the flotation tank (16) is connected to a No. 3 flow guide pipe (37), and one end of the No. 3 flow guide pipe (37) away from the flotation tank (16) is connected to a filter sand tank (38). The filter sand tank (38) has a modified PP fiber ball layer (39), an activated carbon quartz sand mixed layer (40) and a magnetite layer (41) arranged in sequence from top to bottom inside the filter sand tank (38), a No. 1 separation filter plate (42) is arranged between the modified PP fiber ball layer (39) and the activated carbon quartz sand mixed layer (40), and a No. 2 separation filter plate (43) is arranged between the activated carbon quartz sand mixed layer (40) and the magnetite layer (41).

8. The spunlace nonwoven energy-saving zero-discharge water treatment and recycling system according to claim 7, characterized in that: Pressure sensors (44) are provided on the upper and lower outer walls of the first separation filter plate (42) and the second separation filter plate (43); the water outlet of the filter sand tank (38) is connected to a detection pool (45) via a third flow guide pipe (37); a drain outlet (46) is provided at one end of the detection pool (45); and a water pump (47) is provided in the middle of the first flow guide pipe (2), the second flow guide pipe (14) and the third flow guide pipe (37).

9. A method for a spunlace nonwoven energy-saving zero-emission water treatment and recycling system, using the spunlace nonwoven energy-saving zero-emission water treatment and recycling system according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: Step 1: First, wastewater from the production process of spunlace nonwoven fabrics is diverted to a wastewater collection pool (1) for collection. Subsequently, the wastewater collection pool (1) diverts the wastewater to the interior of a filter box (4) through a No. 1 diversion pipe (2). The wastewater is sequentially filtered through a No. 1 filter plate (5) and a No. 2 filter plate (6). The aperture of the No. 1 filter plate (5) is larger than that of the No. 2 filter plate (6), and the aperture of the auxiliary filter plate (11) is equivalent to that of the No. 2 filter plate (6). During the filtering process, when the No. 1 filter plate (5) is clogged by impurities, wastewater gradually accumulates on the top of the No. 1 filter plate (5). The water pressure gradually increases. When the pressure increases to a certain level, the pressure valve (9) inside the No. 1 return pipe (7) opens, so that the sewage passes through the No. 1 return pipe (7), bypasses the No. 1 filter plate (5), and is ejected through the backwash nozzle (10) at the bottom of the No. 1 filter plate (5), thereby backwashing the No. 1 filter plate (5). After the blockage of the No. 1 filter plate (5) is flushed away, the original flow mode is restored. The pressure valve (9) automatically closes after the pressure is reduced. The No. 2 return pipe (8) and the No. 1 return pipe (7) work on the No. 2 filter plate (6) to prevent blockage in the same principle. Step 2: During the backwashing process through the No. 2 return pipe (8), the wastewater flowing through the No. 2 return pipe (8) and then flowing to the bottom of the No. 2 filter plate (6) is filtered through the auxiliary filter plate (11) to ensure the wastewater filtering effect. The auxiliary filter plate (11) is inclined. When the auxiliary filter plate (11) is blocked by impurities, the water gradually accumulates. When the water accumulates to the top of the No. 2 filter plate (6), the pressure valve (9) is opened, thereby pressurizing the auxiliary pressure valve (13). The auxiliary pressure valve (13) is opened under pressure to flush the top of the auxiliary filter plate (11). The auxiliary filter plate (11) is inclined, and the impurities are pushed from a high place to a low place, thereby eliminating the blockage of the auxiliary filter plate (11); Step 3: After the wastewater passes through the filter box (4), it is guided to the sedimentation tank (15) through the No. 2 guide pipe (14). After sedimentation in the sedimentation tank (15), it is filtered and discharged. It is discharged to the flotation tank (16) through the No. 2 guide pipe (14) for flotation treatment. The flotation tank (16) is vented through the gas storage tank (34). The gas enters the flotation tank (16) through the gas pipe (35) and the gas outlet nozzle (36). When the gas pressure drops suddenly, the air dissolved in the water is quickly released as tiny bubbles of 20-50 microns. After the tiny bubbles collide with the flocs, they are attached to the surface of the pollutants through surface tension, van der Waals force or charge action to form a bubble-floc complex. The density of the bubble-floc complex is less than that of water, and it quickly floats to the water surface to form a scum layer. Step 4: The servo motor (22) drives the screw rod (18) to rotate, and the rotation of the screw rod (18) drives the moving block (19) to perform translational motion. The moving block (19) drives the connecting frame (20), the electric telescopic rod (201) and the scraping plate (21) to perform synchronous translational motion. The scraping plate (21) performs reciprocating motion to scrape the scum on the surface of the flotation tank (16) into the sewage collection tank (33). During the scraping process, the height of the scraping plate (21) is controlled by the electric telescopic rod (201) so that the scraping plate (21) is accurately scraped in the direction of the sewage collection tank (33). Step 5: The moving block (19) drives the scraper plate (21) to move and drives the scraper frame (23) to move synchronously. The reciprocating motion of the scraper frame (23) can scrape the inner wall of the flotation tank (16) to prevent sewage impurities from adhering to the inner wall and being difficult to remove. The scraper frame (23) moves and drives the connecting sleeve (26) to move synchronously. The connecting sleeve (26) moves, thereby driving the screw rod (27) to rotate. The rotation of the screw rod (27) drives the first gear (28) to rotate synchronously. The rotation of the first gear (28) drives the transmission toothed belt (31) to rotate, thereby driving the second gear (30) to rotate. The rotation of the second gear (30) drives the rotating rod (29) to rotate synchronously. The rotation of the rotating rod (29) drives the stirring blade (32) to rotate, thereby stirring the inside of the flotation tank (16). Step 6: After flotation, the water is directed through the No. 3 guide pipe (37) to the sand filter tank (38) for further sand filtering treatment. After the sand filtering, the water is directed to the detection tank (45) for water quality testing. If the water quality passes the water quality test, it can be recirculated to the spunlace non-woven fabric production process. If the water quality does not pass, the secondary treatment work is repeated.

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