A printing and dyeing wastewater recycling system and method

Abstract

This invention provides a system and method for reusing dyeing and printing wastewater, belonging to the field of chemical fiber production technology. The system in-house processes part of the dyeing and printing wastewater treatment, resulting in non-volatile and non-precipitated wastewater. This wastewater can be transported over long distances via pipelines or conveniently stored harmlessly. Wastewater from multiple enterprises within a region can be transported via pipelines to a dedicated wastewater treatment plant for secondary treatment. This simple primary treatment process within the factory area does not occupy much space and allows for low-cost storage of the treated wastewater. After pipeline transport to a designated secondary wastewater treatment plant, the plant can also openly store and treat this wastewater at a low cost.

Description

Technical Field

[0001] This invention belongs to the field of chemical fiber production technology and relates to a system and method for reusing dyeing and printing wastewater. Background Technology

[0002] Dyeing and printing wastewater refers to the wastewater generated during the dyeing and printing process of textiles. It contains various dyes, auxiliaries, sizing agents, oils, acids and alkalis, fiber impurities, and heavy metals.

[0003] Under increasingly stringent environmental protection requirements and demands, both fabric processing and textile enterprises have carried out corresponding wastewater treatment. Since the wastewater to be treated by chemical fiber fabric processing enterprises is mainly dyeing and printing wastewater, it is common to treat dyeing and printing wastewater separately. This involves using a combination of methods, including physical methods (such as sedimentation and filtration), chemical methods (such as oxidation and flocculation), and biological methods (such as activated sludge and biofilm methods), to make it reusable or dischargeable.

[0004] As is well known, treatment methods such as sedimentation, oxidation, and flocculation require a large amount of space, especially sedimentation, which not only requires a large storage area but also sufficient sedimentation time. Moreover, in the entire process of treating dyeing and printing wastewater, multiple sedimentation, flocculation, and oxidation processes are required to meet discharge requirements, resulting in the occupation of a large amount of enterprise land. These wastewater treatment facilities often need to be located far from the factory's living and production areas, greatly reducing the space available for normal processing in chemical fiber fabric processing enterprises. In addition, the long-term and diverse wastewater treatment process inevitably produces odors in the factory area. Therefore, for small and medium-sized chemical fiber processing enterprises (and even for large chemical fiber processing enterprises), treating the entire process of dyeing and printing wastewater in-house is not only costly and detrimental to the factory environment but also occupies a significant portion of the factory space. This practical problem urgently needs to be solved, especially in the eastern coastal areas with high industrial clusters where space is precious and similar enterprises have similar wastewater treatment needs. Based on the above situation, this application proposes a new dyeing and printing wastewater treatment system and method. Summary of the Invention

[0005] The first objective of this invention is to address the aforementioned problems in the existing technology by providing a dyeing and printing wastewater reuse system. The technical problem to be solved by this invention is how to perform preliminary treatment of wastewater.

[0006] The objective of this invention can be achieved through the following technical solution: A dyeing and printing wastewater reuse system, characterized in that it includes a lint removal device, a sedimentation tank, and a cooling tank. The lint removal device includes a water tank and a plurality of lint removal components arranged alternately along the length of the water tank. The lint removal components include a lint collection structure and a lint removal structure. The lint collection structure includes a pulley one rotatably connected above the water surface, a pulley two rotatably connected below the water surface, a lint-adhesive belt traction between pulley one and pulley two, and a lint collection trough located above the water surface. The shaft of pulley one... The plane containing the axis of the first pulley and the corresponding pulley two forms an angle of 20-70° with the liquid surface in the water tank. The lint collection tank is located below the first pulley. The lint removal structure includes a fixed block fixed to the side wall of the water tank and a rotating block rotatably connected to the other side wall of the water tank. Several elastic ropes are connected between the fixed block and the rotating block. In their natural state, the elastic ropes are parallel to each other and separated from each other with a gap. The second pulley is driven by a power source to rotate continuously. The elastic ropes abut against the outer surface of the lint-collecting belt. The rotating block is driven by a power source to rotate intermittently.

[0007] Water enters at one end of the water tank and exits at the other end. The lint-free wastewater discharged from the water tank enters the sedimentation tank, and the supernatant in the sedimentation tank is connected to the water inlet of the cooling box.

[0008] Furthermore, a motor is installed on the side wall of the water tank, a drive gear is installed on the output shaft of the motor, a driven gear is fixed on the axle where each pulley is located, and a toothed belt pulls between each driven gear and the drive gear.

[0009] Furthermore, an incomplete gear is fixedly mounted on the axle of the pulley, and a transmission gear is fixedly mounted on the rotating block. The incomplete gear can mesh with the transmission gear.

[0010] Furthermore, the lint collection trough penetrates one of the side walls of the water tank, and one end of the lint collection trough that penetrates the water tank is lower than the other end of the lint collection trough.

[0011] Furthermore, the cooling box includes a box body, several upper partitions located inside the box body, and lower partitions disposed between adjacent upper partitions. There is a gap between the upper partitions and the bottom of the box body, and a gap between the lower partitions and the top of the box body. The upper partitions form a fabric-passing groove I on the box body that penetrates the upper surface, front side, and rear side of the box body, and the lower partitions form a fabric-passing groove II on the box body that penetrates the upper surface, front side, and rear side of the box body.

[0012] Furthermore, the lint-repellent tape has a double-layer structure, with an outer layer of metal wire mesh and an inner layer of water-permeable sponge.

[0013] Furthermore, the sedimentation tank is an inclined tube sedimentation tank.

[0014] Because the existing whole-process dyeing and printing wastewater treatment process requires multiple sedimentation, oxidation, flocculation and filtration, it occupies a large area and has high costs, while the actual recovery benefits are negligible, this solution optimizes it by performing only one treatment on-site, namely lint removal, volatilization and sedimentation, and then sending it to a professional secondary treatment company.

[0015] Compared to existing lint removal filtration, this solution first uses a lint-adhesive belt to "salvage" lint and suspended solids in the wastewater, causing them to "adhere" to the lint-adhesive belt. Then, by continuously pulling one end of an elastic rope while intermittently twisting the other end, the lint and attached matter adhering to the outer surface of the lint-adhesive belt are removed. This removal method is different from scraping; it uses multiple ropes to stretch and twist into strands to "roll" away the adhering lint, presenting an action of "pulling" the lint. After the multiple ropes rotate and separate from each other, the lint falls off and falls into the lint collection tank.

[0016] The cooling box in this solution is a non-contact water cooling method. It utilizes the meandering flow path formed by the water flow within the box to create multiple cooling zones, namely, fabric insertion groove one and fabric insertion groove two. The fabric or filament to be cooled can be passed through fabric insertion groove one and fabric insertion groove two to achieve auxiliary cooling. Alternatively, multiple fabric insertion grooves one and fabric insertion groove two can be connected in series to achieve multiple cooling, replacing the traditional air cooling method and achieving a better cooling effect. Since the wastewater is at room temperature after evaporation and sedimentation treatment, it can absorb the heat of the fabric or filament to be cooled, thus achieving a cooling effect.

[0017] The second objective of this invention is to address the problems existing in the prior art by proposing a method for reusing dyeing and printing wastewater. This method aims to achieve primary treatment of dyeing and printing wastewater within an enterprise with a small footprint and a high utilization rate, and then discharge it through pipelines to a centralized treatment point for secondary treatment.

[0018] A method for reusing dyeing and printing wastewater, characterized by comprising the following steps:

[0019] Simultaneously complete the treatment of volatile matter dispersion and lint removal for dyeing and printing wastewater;

[0020] The treated wastewater is then subjected to sedimentation treatment.

[0021] The supernatant after sedimentation is used for contactless cooling of the fabric during the fabric processing.

[0022] The wastewater after use will be transported through pipelines to a secondary treatment plant for dyeing and printing wastewater.

[0023] Furthermore, in step A, the wastewater is adjusted to acidity, and volatiles are collected during the stirring process. The volatiles are treated by adsorption and temporary storage or incineration. The water content of the volatiles in the wastewater is monitored in real time. When the water content of the volatiles in the wastewater is higher than 95%, the wastewater can be sent to the sedimentation tank.

[0024] Furthermore, in step C, the settled wastewater passes through a cooling tank, and the synthetic melt-spun filaments or fabric to be cooled can pass through fabric trough one and fabric trough two.

[0025] As one or the only cooling method for melt-spun synthetic fiber filaments or fabrics to be cooled, melt-spun synthetic fiber filaments need to be cooled during the cooling and setting stage. They can be cooled without contact by passing through the first and second fabric troughs. Fabrics need to be cooled after heat setting, dyeing, printing and color fixing, drying and hot melt dyeing in order to fix the color and facilitate subsequent processes.

[0026] Compared to existing technologies, the basic logic of this solution is as follows: Part of the treatment process for dyeing and printing wastewater is handled internally, resulting in non-volatile and non-precipitated wastewater. This wastewater can be transported over long distances via pipelines and is also conveniently stored harmlessly. Wastewater from multiple enterprises within the area can be transported via pipelines to a dedicated wastewater treatment plant for secondary treatment. This simple primary treatment process within the factory area does not occupy much space and allows for low-cost storage of the treated wastewater. After being transported via pipelines to a designated secondary wastewater treatment company, the company can also store and treat this wastewater in an open manner, resulting in lower costs.

[0027] The descaling, evaporation, and sedimentation processes not only facilitate convenient and harmless storage but also prevent blockages and scale buildup in the delivery pipelines and significantly extend the maintenance cycle of the cooling box. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating the dyeing and printing wastewater treatment process.

[0029] Figure 2 This is a schematic diagram of a primary treatment system for dyeing and printing wastewater.

[0030] Figure 3 This is a schematic diagram of the lint removal device.

[0031] Figure 4 This is a cross-sectional view of the water tank.

[0032] Figure 5 yes Figure 3 A magnified view of part A in the middle.

[0033] Figure 6 This is a schematic diagram of the lint-adhesive band.

[0034] Figure 7 This is a 3D view of the cooling box.

[0035] Figure 8 This is a cross-sectional view of the cooling box.

[0036] Figure 9 This is a schematic diagram of the cooling box when the fabric is inserted at its insertion point.

[0037] Figure 10 This is a schematic diagram showing the state of the elastic rope after it twists and becomes stranded as the rotating block rotates.

[0038] In the diagram, 1. Hair removal device; 11. Water tank; 12. Pulley 1; 13. Pulley 2; 14. Hair collection tank; 15. Fixed block; 16. Rotating block; 17. Elastic pull rope; 18. Hair-adhesive belt; 181. Metal wire mesh; 182. Water-permeable sponge; 21. Motor; 22. Drive gear; 23. Driven gear; 24. Toothed belt; 25. Incomplete gear; 26. Transmission gear; 3. Sedimentation tank; 4. Cooling box; 41. Box body; 42. Upper partition; 43. Lower partition; 44. Fabric insertion trough 1; 45. Fabric insertion trough 2. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0040] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 10As shown, the dyeing and printing wastewater reuse system includes a lint removal device 1, a sedimentation tank 3, and a cooling tank 4. The lint removal device 1 includes a water tank 11 and several lint removal components arranged alternately along the length of the water tank 11. Each lint removal component includes a lint collection structure and a lint removal structure. The lint collection structure includes a pulley 12 rotatably connected above the liquid surface of the water tank 11, a pulley 2 rotatably connected below the liquid surface of the water tank 11, a lint-adhesive belt 18 pulling between pulley 12 and pulley 2 13, and a lint collection trough 14 located above the liquid surface of the water tank 11. The axis of pulley 12 and the axis of pulley 2 13 are... The plane containing the axis forms an angle of 20 to 70° with the liquid surface in the water tank 11. The lint collection tank 14 is located below the pulley 12. The lint removal structure includes a fixed block 15 fixed to the side wall of the water tank 11 and a rotating block 16 rotatably connected to the other side wall of the water tank 11. Several elastic pull ropes 17 are connected between the fixed block 15 and the rotating block 16. The elastic pull ropes 17 are parallel to each other in their natural state and are separated from each other with a gap in their natural state. The pulley 13 is driven by a power source to rotate continuously. The elastic pull ropes 17 abut against the outer surface of the lint-sticking belt 18. The rotating block 16 is driven by a power source to rotate intermittently.

[0041] Water enters at one end of the water tank 11 and exits at the other end. The lint-free wastewater discharged from the water tank 11 enters the sedimentation tank 3. The sedimentation tank 3 is an inclined tube sedimentation tank. The inclined tube sedimentation tank has a large sedimentation area, a small footprint, and is less affected by liquid movement. The supernatant of the sedimentation tank 3 is connected to the water inlet of the cooling tank 4.

[0042] A motor 21 is installed on the side wall of the water tank 11. A drive gear 22 is installed on the output shaft of the motor 21. A driven gear 23 is fixed on the axle of each pulley 23. A toothed belt 24 pulls between each driven gear 23 and the drive gear 22. Power is synchronously transmitted from the motor 21 to each pulley 23. The rotation of the pulley 23 will drive the pulley 12 to rotate. An incomplete gear 25 is fixed on the axle of the pulley 12. A transmission gear 26 is fixed on the rotating block. The incomplete gear 25 can mesh with the transmission gear 26. The diameter of the incomplete gear 25 is several times that of the transmission gear 26. The torque of pulley 2 13 is transmitted to pulley 12 through the lint-stick belt 18. During one rotation of the incomplete gear 25, there are two states. One state is when the incomplete gear 25 is engaged with the transmission gear 26. At this time, the rotating block continues to rotate. The rotation process is the process of each elastic rope 17 twisting together, which can pull out the lint on the surface of the lint-stick belt 18 that is attached and moving and trap it in the twisted elastic rope 17. The other state is when the toothless position of the incomplete gear 25 is close to the transmission gear 26. At this time, the rotating block is not subjected to torque, but is rotated by the restoring force of the elastic rope 17. At this time, each strand is in a dispersed state. During this process, the lint trapped on each elastic rope 17 is released and falls into the lint collection groove 14.

[0043] The lint collection trough 14 penetrates one of the side walls of the water tank 11. One end of the lint collection trough 14 that penetrates the water tank 11 is lower than the other end of the lint collection trough 14, and the lint can be discharged outward in the inclined direction.

[0044] In the lint removal device 1 described above, the rotation of the lint-adhesive belt 18 agitates the water, causing scum to float to the surface along the straight section of the belt and adhere to it. Furthermore, since the lint-adhesive belt 18 has a double-layer structure—an outer layer of wire mesh 181 and an inner layer of permeable sponge 182—the pulley 12 squeezes out water from the permeable sponge 182 when it contacts the belt, resulting in very low moisture content in the lint in that area. This squeezing process also reverses the cleaning of the wire mesh 181, making it easier for the elastic pull rope 17 to pull the lint out. During the re-entry of the lint-adhesive belt 18 into the water, the permeable sponge 182 changes from dry to wet, allowing it to... The water contains a certain amount of air, which is squeezed out when the sponge is squeezed by the pulley 13, which is equivalent to an aeration action. This causes the foam and scum in the water to float to the surface. Therefore, this solution not only uses a simpler scum removal structure than existing technologies, but also achieves actions such as reverse suction of the wire mesh 181, air injection into the water, and air squeezing out at the bottom of the water to form bubbles. Traditional scum removal structures are much more complex and require much more space than this solution. This solution continuously removes scum and dregs and volatilizes them during the scum removal process, which is a space-saving and low-cost treatment method.

[0045] like Figure 7 , Figure 8 and Figure 9 The cooling box 4 shown includes a box body 41, several upper partitions 42 located inside the box body 41, and lower partitions 43 disposed between adjacent upper partitions 42. There is a gap between the upper partitions 42 and the bottom of the box body 41, and there is a gap between the lower partitions 43 and the top of the box body 41. The upper partitions 42 form a fabric-passing groove 44 that penetrates the upper surface, front side and rear side of the box body 41, and the lower partitions 43 form a fabric-passing groove 45 that penetrates the upper surface, front side and rear side of the box body 41.

[0046] Because the existing whole-process dyeing and printing wastewater treatment process requires multiple sedimentation, oxidation, flocculation and filtration, it occupies a large area and has high costs, while the actual recovery benefits are negligible, this solution optimizes it by performing only one treatment on-site, namely lint removal, volatilization and sedimentation, and then sending it to a professional secondary treatment company.

[0047] Compared to existing lint removal filtration, this solution first uses a lint-collecting belt 18 to "salvage" lint and suspended solids in the wastewater, causing them to "adhere" to the lint-collecting belt 18. Then, by fixing one end of an elastic rope 17 and intermittently twisting the other end, the lint and attached substances adhering to the outer surface of the lint-collecting belt 18 are removed. This removal method is different from scraping. It uses multiple ropes to stretch and twist into strands to "roll" away the adhering lint, presenting an action of "pulling" the lint. After the multiple ropes rotate back and separate from each other, the lint falls off and falls into the lint collection tank 14.

[0048] The cooling box 4 in this solution is a non-contact water cooling method. It utilizes the meandering flow path formed by the water flow within the box body 41 to create multiple cooling zones, namely, the first fabric-passing groove 44 and the second fabric-passing groove 45. The fabric or filament to be cooled can be passed through the first fabric-passing groove 44 and the second fabric-passing groove 45 to achieve auxiliary cooling. Alternatively, multiple fabric-passing grooves 44 and the second fabric-passing groove 45 can be connected in series for multiple cooling, replacing the traditional air cooling method and achieving a better cooling effect. Since the wastewater is at room temperature after evaporation and sedimentation treatment, it can absorb the heat of the fabric or filament to be cooled, thus achieving a cooling effect.

[0049] like Figure 1 As shown, the hot dyeing and printing wastewater is first treated with volatile matter dispersion and lint removal. Specifically, volatile matter dispersion is carried out simultaneously with lint removal. The hot wastewater that is just discharged is immediately subjected to volatile matter dispersion treatment, which is beneficial to improving the volatile matter volatilization efficiency. In addition, its pH is adjusted to acidic. It is necessary to list the volatile and non-volatile substances in the dyeing and printing wastewater. Among them, volatile substances include volatile organic compounds remaining from dyes, auxiliaries, and cleaning agents, including benzene compounds, formaldehyde, alcohols, ketones, esters, halogenated hydrocarbons, ammonia water used in the dyeing and printing process, and ammonia gas formed from the decomposition of nitrogen-containing organic matter, hydrogen sulfide gas formed from dye decomposition and the reduction of sulfates under anaerobic conditions, as well as some other volatile substances such as acetic acid, formic acid, phenols, and amines. Although ammonia gas is more volatile in an alkaline environment, hydrogen sulfide gas is more volatile in an alkaline environment. Phenolic compounds, amines, etc., are more volatile under acidic conditions. Since ammonia itself is highly volatile, when controlling the pH of wastewater, it is necessary to adjust it to acidic conditions for lint treatment and volatile substance dispersal. Industrial acetic acid can be used to adjust the pH. Industrial acetic acid itself is volatile, so it needs to be added continuously and slowly, and cannot be added all at once. The non-volatile substances in dyeing and printing wastewater mainly include inorganic salts, heavy metal ions, macromolecular organic matter, suspended solids, a small amount of recalcitrant organic matter, and a small amount of non-volatile acids and non-volatile alkalis. Among them, suspended solids are removed during the volatilization process, while other non-volatile substances can be partially precipitated and partially mixed with water. In this scheme, the precipitable part is separated in the sedimentation tank 3, and the non-precipitable part continues to flow with the wastewater to the cooling tank 4, and after cooling and utilization, it is sent to the secondary wastewater treatment plant.

[0050] During the volatilization process of wastewater, it is necessary to monitor the composition of the volatiles. When the non-aqueous components in the volatiles are extremely small, that is, when the water content is higher than 95%, it can be determined that the volatiles have basically volatilized completely. At this time, they can be sent to sedimentation tank 3.

[0051] After volatile matter dispersion and suspended solids removal, the wastewater is physically indistinguishable from ordinary industrial wastewater and can be directly stored in the open or transported to a sewage treatment plant for secondary treatment via pipeline.

[0052] Therefore, the basic logic of this solution is as follows: We will handle part of the treatment process for dyeing and printing wastewater ourselves, creating non-volatile and non-precipitated wastewater. This wastewater can be transported over long distances via pipelines and is also conveniently stored harmlessly. Wastewater from multiple enterprises within the area can be transported via pipelines to a dedicated wastewater treatment plant for secondary treatment. This simple primary treatment process within the factory area does not occupy much space and allows for low-cost storage of the treated wastewater. After pipeline transport to a designated secondary wastewater treatment plant, the plant can also store and treat this wastewater in an open manner at a low cost. The descaling, volatilization, and sedimentation treatments not only facilitate harmless storage but also prevent pipeline blockage and scale buildup, significantly extending the maintenance cycle of cooling tank 4. For industrial clusters and areas with limited industrial land, especially for small and medium-sized chemical fiber processing enterprises, this not only saves costs and fully leverages the cost advantages of centralized treatment but also significantly reduces the space occupied by wastewater treatment and improves the factory environment.

[0053] Secondary treatment is a common technology in the field, allowing for centralized treatment of wastewater transported from multiple plants, tailored to specific conditions after checking wastewater parameters. This solution aims to propose a preliminary treatment process to achieve low-cost storage and transportation before sending the wastewater to a secondary treatment plant. The secondary treatment methods can be tailored to specific needs, and the details of the secondary treatment process will not be elaborated upon.

[0054] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A printing and dyeing wastewater recycling system, characterized in that, The system includes a lint removal device (1), a sedimentation tank (3), and a cooling tank (4). The lint removal device (1) includes a water tank (11) and several lint removal components arranged alternately along the length of the water tank (11). Each lint removal component includes a lint collection structure and a lint removal structure. The lint collection structure includes a pulley one (12) rotatably connected above the liquid surface of the water tank (11), a pulley two (13) rotatably connected below the liquid surface of the water tank (11), a lint-adhesive belt (18) traction between pulley one (12) and pulley two (13), and a lint collection trough (14) located above the liquid surface of the water tank (11). The plane containing the axis of pulley one (12) and the axis of pulley two (13) that cooperates with it is parallel to the plane of the water tank (11). The liquid surfaces in the water tank (11) are inclined at an angle of 20 to 70°. The lint collection tank (14) is located below the pulley one (12). The lint removal structure includes a fixed block (15) fixed on the side wall of the water tank (11) and a rotating block (16) rotatably connected to the other side wall of the water tank (11). Several elastic pull ropes (17) are connected between the fixed block (15) and the rotating block (16). Each elastic pull rope (17) is parallel to each other in its natural state and is separated from each other with a gap in its natural state. The pulley two (13) is driven by power to rotate continuously. The elastic pull ropes (17) abut against the outer surface of the lint-sticking belt (18). The rotating block (16) is driven by power to rotate intermittently. Water enters at one end of the water tank (11) and exits at the other end. The lint-free wastewater discharged from the water tank (11) enters the sedimentation tank (3). The supernatant of the sedimentation tank (3) is connected to the water inlet of the cooling box (4). A motor (21) is installed on the side wall of the water tank (11). A drive gear (22) is installed on the output shaft of the motor (21). A driven gear (23) is fixed on the axle where each pulley (13) is located. A toothed belt (24) is pulled between each driven gear (23) and the drive gear (22). An incomplete gear (25) is fixedly installed on the axle of the pulley (12), and a transmission gear (26) is fixedly installed on the rotating block (16). The incomplete gear (25) can mesh with the transmission gear (26). The diameter of the incomplete gear (25) is several times that of the transmission gear (26). The torque of the pulley two (13) is transmitted to the pulley one (12) through the lint belt (18). There are two states during the rotation of the incomplete gear (25). One state is that the incomplete gear (25) is meshed with the transmission gear (26). At this time, the rotating block (16) continues to rotate. The rotation process is the process of the elastic ropes (17) twisting together. This allows the lint on the surface of the lint belt (18) that is attached and moving to be pulled out and tangled in the lint belt (17). The other state is that the toothless position of the incomplete gear (25) is close to the transmission gear (26). At this time, the rotating block (16) is not subjected to torque. Instead, it is rotated by the restoring force of the elastic ropes (17). At this time, the strands are in a dispersed state. During this process, the lint that is tangled on the elastic ropes (17) is released and falls into the lint collection groove (14). The hair collection trough (14) penetrates one of the side walls of the water tank (11). One end of the hair collection trough (14) penetrating the water tank (11) is lower than the other end of the hair collection trough (14), and the hair can be discharged outward in the inclined direction. The rotation of the sticky belt (18) can agitate the water, causing the scum to float to the surface of the liquid along the straight section of the sticky belt (18) and adhere to the sticky belt (18). The sticky belt (18) has a double-layer structure, with an outer layer of metal wire mesh (181) and an inner layer of water-permeable sponge (182). When the pulley one (12) comes into contact with the sticky belt (18), it can squeeze out the water on the water-permeable sponge (182), making the scum in this area very low in moisture content. The water squeezing process can reverse the cleaning of the metal wire mesh (181), and the scum is more easily pulled out by the elastic rope (17). During the process of the sticky belt (18) re-entering the water, the water-permeable sponge (182) changes from dry to wet, and can carry a certain amount of air into the water. Then, when the pulley two (13) squeezes the sponge, this part of the air can be squeezed out, which is equivalent to an aeration action, causing the foam and scum in the water to float to the surface.

2. The printing and dyeing wastewater recycling system according to claim 1, characterized in that, The cooling box (4) includes a box body (41), several upper partitions (42) located inside the box body (41), and lower partitions (43) disposed between adjacent upper partitions (42). There is a gap between the upper partitions (42) and the bottom of the box body (41), and there is a gap between the lower partitions (43) and the top of the box body (41). The upper partitions (42) form a fabric-passing groove 1 (44) on the box body (41) that penetrates the upper surface, front side and rear side of the box body (41), and the lower partitions (43) form a fabric-passing groove 2 (45) on the box body (41) that penetrates the upper surface, front side and rear side of the box body (41).

3. The dyeing and printing wastewater reuse system according to claim 1, characterized in that, The sedimentation tank (3) is an inclined tube sedimentation tank.

4. A method for reusing dyeing and printing wastewater, characterized in that, Includes the following steps: A. The dyeing and printing wastewater reuse system as described in claim 1 or 3 is used to simultaneously complete the volatile matter dispersion and lint removal treatment of the dyeing and printing wastewater. B. Perform sedimentation treatment on the treated wastewater; C. Using the cooling box (4) as described in claim 2, the supernatant after precipitation is used for non-contact cooling of the fabric during the fabric processing process; D. The used wastewater is transported through pipelines to the secondary treatment plant for dyeing and printing wastewater.

5. The method for recycling printing and dyeing wastewater according to claim 4, characterized in that, In step A, the wastewater is adjusted to acidity, and volatiles are collected during the stirring process. The volatiles are treated by adsorption and temporary storage or incineration. The water content of the volatiles in the wastewater is monitored in real time. When the water content of the volatiles in the wastewater is higher than 95%, the wastewater is sent to the sedimentation tank (3).

6. The method for reusing dyeing and printing wastewater according to claim 4, characterized in that, In step C, the settled wastewater passes through the cooling tank (4), and the synthetic melt-spun filaments or fabric to be cooled pass through the fabric trough one (44) and fabric trough two (45).

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