Printing and dyeing wastewater recycling system and method

Abstract

The invention provides a printing and dyeing wastewater recycling system and method, and belongs to the technical field of chemical fiber production. Part of treatment procedures of the printing and dyeing wastewater are carried out by oneself, so that the printing and dyeing wastewater is formed into non-volatile and non-precipitated sewage, the part of sewage can be conveyed for a long distance through a pipeline and is also conveniently and harmlessly stored, and the sewage of a plurality of enterprises in a district can be conveyed to a sewage treatment plant specially for secondary treatment through the pipeline, so that the sewage treatment efficiency is improved. In the process of simple primary treatment in a factory, not only is more occupied, but also sewage subjected to primary treatment can be stored at low cost, and after the sewage is conveyed to a specified sewage secondary treatment enterprise through a pipeline, the sewage secondary treatment enterprise can also store and treat the sewage in an open manner, so that the cost is lower.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical fiber production, and relates to a printing and dyeing wastewater recycling system and method. Background Art

[0002] Printing and dyeing wastewater refers to the wastewater generated in the process of textile printing and dyeing, which contains various dyes, auxiliaries, slurries, oils, acids and alkalis, fiber impurities, heavy metals and other substances.

[0003] Under increasingly stringent environmental protection requirements and demands, fabric processing companies and textile companies have each carried out corresponding wastewater treatment. Since the wastewater to be treated by chemical fiber fabric processing companies is mainly printing and dyeing wastewater, it is common to treat the printing and dyeing wastewater separately, that is, to adopt a combination of methods including physical methods (such as precipitation, filtration), chemical methods (such as oxidation, flocculation), and biological methods (such as activated sludge method, biofilm method) to make it meet the requirements for reuse or discharge.

[0004] As we all know, treatment methods such as precipitation, oxidation, and flocculation occupy a very large area, especially precipitation, which not only requires a large accommodation space, but also requires sufficient precipitation time. Moreover, in the whole process of printing and dyeing wastewater treatment, in order to meet the discharge requirements, multiple precipitation, multiple flocculation and oxidation are required, resulting in the occupation of a large amount of enterprise land. These sewage treatment facilities often need to be far away from the living area and production area of ​​the factory, which greatly compresses the space available for normal processing of the chemical fiber fabric processing enterprise. In addition, the long-term and diversified sewage treatment process inevitably causes the generation of odor in the factory area. Therefore, for small and medium-sized chemical fiber processing enterprises (even for large chemical fiber processing enterprises), the whole process of printing and dyeing sewage is handled by themselves, which is not only costly and unfavorable to the factory environment, but also occupies a large proportion of the site. This practical problem needs to be solved urgently, especially for the eastern coastal areas with high industrial clusters. The site is precious and the sewage treatment needs of similar enterprises are also similar. Based on the above situation, this application proposes a new printing and dyeing wastewater treatment system and method. Summary of the invention

[0005] The first purpose of the present invention is to provide a printing and dyeing wastewater recycling system in view of the above-mentioned problems existing in the prior art. The technical problem to be solved by the present invention is how to perform preliminary treatment on the wastewater.

[0006] The object of the present invention can be achieved by the following technical solutions: A printing and dyeing wastewater reuse system, characterized in that it includes a hair removal device, a sedimentation tank and a cooling tank. The hair removal device includes a water tank and a plurality of hair removal components arranged at intervals along the length direction of the water tank. The hair removal component includes a hair collection structure and a hair removal structure. The hair collection structure includes a pulley one rotatably connected above the liquid level of the water tank, a pulley two rotatably connected below the liquid level of the water tank, a sticky hair belt pulled between the pulley one and the pulley two, and a hair collection tank located above the liquid level of the water tank; The plane where the axis of the pulley one and the axis of the pulley two cooperating with it are located forms an inclination angle of 20-70° with the liquid level in the water tank. The hair collection tank is located below the pulley one. The hair removal structure includes a fixed block fixed on the side wall of the water tank and a rotating block rotatably connected to the other side wall of the water tank. A plurality of elastic drawstrings are connected between the fixed block and the rotating block. In the natural state, the elastic drawstrings are parallel to each other, and in the natural state, the elastic drawstrings are separated from each other and have a spacing; The pulley two is continuously rotated by power, the elastic drawstring abuts against the outer side surface of the sticky hair belt, and the rotating block is intermittently rotated by power;

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

[0008] Further, a motor is provided on the side wall of the water tank, a driving gear is provided on the output shaft of the motor, a driven gear is fixed on the wheel shaft where each pulley two is located, and a toothed belt is pulled between each driven gear and the driving gear.

[0009] Further, an incomplete gear is fixed on the wheel shaft of the pulley one, a transmission gear is fixed on the movable block, and the incomplete gear can be meshed with the transmission gear.

[0010] Further, the hair collection tank penetrates through one side wall of the water tank, and the end of the hair collection tank penetrating through the water tank is lower than the other end of the hair collection tank.

[0011] Further, the cooling tank includes a box body, a plurality of upper partition plates located in the box body and lower partition plates arranged between adjacent upper partition plates. There is a gap between the upper partition plate and the bottom of the box body, and there is a gap between the lower partition plate and the top of the box body. The upper partition plate forms a cloth-passing groove one on the box body that penetrates the upper surface, the front side surface and the rear side surface of the box body. The lower partition plate forms a cloth-passing groove two on the box body that penetrates the upper surface, the front side surface and the rear side surface of the box body.

[0012] Further, the sticky hair belt is of a double-layer structure, with a metal wire mesh on the outer layer and a water-permeable sponge on the inner layer.

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

[0014] Since the existing full-process printing and dyeing wastewater treatment process requires multiple sedimentation, multiple oxidation, flocculation and filtration, it occupies a large area and has high costs, while the actual recovery benefits are negligible, this plan optimizes it and only carries out one treatment in the factory, namely, descaling, volatilization and precipitation, and then sends it to a professional secondary treatment company.

[0015] Compared with the existing dandruff removal and filtration, this solution first uses a sticky belt to "salvage" the dandruff and suspended matter in the sewage, making them "adhere" to the sticky belt, and then removes the dandruff and attachments adhering to the outer surface of the sticky belt by keeping one end of the elastic pull rope continuous and the other end intermittently twisting. This removal method is different from scraping. It is a method of "rolling" away the adhering dandruff during the process of stretching and twisting multiple ropes, presenting an action of "pulling" the dandruff. After the multiple pull ropes rotate to separate from each other, the dandruff falls off and falls into the dandruff collection tank.

[0016] The cooling box in the present scheme is a contact-free water cooling method, which utilizes the circuitous flow path formed by water flow in the box to form multiple cooling zones, namely, cloth threading slot one and cloth threading slot two. The cloth to be cooled or the filament to be cooled can be passed through the cloth threading slot one and cloth threading slot two to achieve auxiliary cooling. It can also be connected in series for multiple times through multiple cloth threading slots one and two, and multiple cooling methods can replace traditional air cooling to achieve better cooling effect. Since the sewage is normal temperature sewage after volatilization and sedimentation treatment, it can absorb the heat of the cloth to be cooled or the filament to be cooled to achieve a cooling effect.

[0017] The second purpose of the present invention is to propose a method for recycling printing and dyeing wastewater in response to the problems existing in the prior art, aiming to achieve primary treatment of printing and dyeing wastewater within the enterprise with smaller site occupancy and higher utilization rate, and then output it through pipelines to a centralized treatment point for secondary treatment.

[0018] A method for recycling printing and dyeing wastewater, characterized in that it comprises the following steps:

[0019] A. Synchronously complete the volatile matter dispersal and dandruff removal of printing and dyeing wastewater;

[0020] B. Carry out sedimentation treatment on the treated sewage;

[0021] C. Use the supernatant after precipitation for contact-free cooling of fabrics during fabric processing;

[0022] D. Transport the utilized sewage to the printing and dyeing sewage secondary treatment plant through pipelines.

[0023] Further, in step A, the sewage is adjusted to be acidic, and volatiles are collected during agitation. The volatiles are treated by adsorption and temporary storage or incineration; the water content of the sewage volatiles is monitored in real time. After the water content of the sewage volatiles is higher than 95%, the sewage can be sent to the sedimentation tank.

[0024] Further, in step C, the precipitated sewage passes through a cooling tank. What passes through the cloth-passing tank 1 and the cloth-passing tank 2 can be synthetic fiber melt-spun filaments to be cooled or cloth to be cooled.

[0025] As one or the only cooling method for the synthetic fiber melt-spun filaments to be cooled or the cloth to be cooled, the synthetic fiber melt-spun filaments need to be cooled during the cooling and shaping stage and can achieve contactless cooling by passing through the cloth-passing tank 1 and the cloth-passing tank 2; the cloth needs to be cooled after heat setting, dyeing, printing and color fixation, drying, and heat-melt dyeing in order to fix the color and facilitate subsequent processes, etc.

[0026] Compared with the prior art, the basic logic of this solution is as follows: Some treatment processes of the printing and dyeing wastewater are carried out by itself to form sewage that does not volatilize and does not precipitate. This part of the sewage can be transported over a long distance through pipelines and is also convenient for harmless storage. The sewage of multiple enterprises in the area can be transported through pipelines to a sewage treatment plant specialized for secondary treatment. In this way, during the simple primary treatment in the factory area, neither much site is occupied, nor can the sewage after primary treatment be stored at low cost. After being transported through pipelines to the designated sewage secondary treatment enterprise, the sewage secondary treatment enterprise can also store and treat this part of the sewage in an open manner, and its cost is relatively low.

[0027] Carrying out dandruff removal, volatilization, and precipitation treatment is not only for convenient and harmless storage, but also can avoid pipeline blockage and fouling, and can also greatly extend the maintenance cycle of the cooling tank. Description of the Drawings

[0028] Figure 1 is a schematic flow chart of the printing and dyeing sewage treatment process.

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

[0030] Figure 3 is a schematic structural diagram of the dandruff removal device.

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

[0032] Figure 5 is Figure 3 an enlarged view of the partial area A in

[0033] Figure 6 is a schematic structural diagram of the hair sticking tape.

[0034] Figure 7 It is a perspective view of the cooling box.

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

[0036] Figure 9 It is a schematic structural diagram when the cooling box penetrates the fabric at its fabric-passing position.

[0037] Figure 10 It is a schematic diagram of the state of the elastic drawstring after the movable block is twisted into strands.

[0038] In the figure, 1 is the lint removing device; 11 is the water tank; 12 is the first pulley; 13 is the second pulley; 14 is the lint collection tank; 15 is the fixed block; 16 is the rotating block; 17 is the elastic drawstring; 18 is the lint sticking tape; 181 is the wire mesh; 182 is the water-permeable sponge; 21 is the motor; 22 is the driving gear; 23 is the driven gear; 24 is the toothed belt; 25 is the incomplete gear; 26 is the transmission gear; 3 is the sedimentation tank; 4 is the cooling box; 41 is the box body; 42 is the upper partition board; 43 is the lower partition board; 44 is the first fabric-passing groove; 45 is the second fabric-passing groove. Specific embodiments

[0039] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0040] Such as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 10As shown in the figure, the printing and dyeing wastewater reuse system includes a hair debris removal device 1, a sedimentation tank 3, and a cooling tank 4. The hair debris removal device 1 includes a water tank 11 and a number of hair debris removal components arranged at intervals along the length direction of the water tank 11. The hair debris removal components include a hair debris collection structure and a hair debris removal structure. The hair debris collection structure includes a pulley 12 rotatably connected above the liquid level of the water tank 11, a pulley 13 rotatably connected below the liquid level of the water tank 11, a sticky hair belt 18 stretched between the pulley 12 and the pulley 13, and a hair debris collection tank 14 located above the liquid level of the water tank 11. The plane where the axis of the pulley 12 and the axis of the pulley 13 cooperating with it are located forms an angle of 20-70° with the liquid level in the water tank 11. The hair debris collection tank 14 is located below the pulley 12. The hair debris 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. A number of rotating elastic ropes 17 are connected between the fixed block 15 and the rotating block 16. In the natural state, the rotating elastic ropes 17 are parallel to each other, separated from each other and have a spacing. The pulley 13 is continuously rotated by power. The rotating elastic ropes 17 abut against the outer side surface of the sticky hair belt 18. The rotating block 16 is intermittently rotated by power.

[0041] One end of the water tank 11 is for water inlet, and the other end is for water outlet. The hair debris-free sewage discharged from the water tank 11 enters the sedimentation tank 3. The sedimentation tank 3 is an inclined tube sedimentation tank 3. The inclined tube sedimentation tank 3 has a large sedimentation area, a small floor area, and is less affected by liquid movement. The supernatant of the sedimentation tank 3 is connected to the water inlet end of the cooling tank 4.

[0042] A motor 21 is arranged on the side wall of the water tank 11, and a driving gear 22 is arranged 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 driving gear 22. The power is synchronously transmitted to each pulley 13 by the motor 21. The rotation of the pulley 13 will drive the pulley 1 12 to rotate. An incomplete gear 25 is fixed on the axle of the pulley 12, and a transmission gear 26 is fixed on the movable 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 the pulley 2 13 is transmitted to the pulley 1 12 through the hair sticking belt 18. There are two states in the process of the incomplete gear 25 rotating one circle. One state is the state that the incomplete gear 25 is meshed with the transmission gear 26. At this time, the movable block continues to rotate. The rotation process is the process of the strands of each rotating elastic rope 17, which can make the hair debris on the surface of the sticky belt 18 that is attached and moved be pulled out and twisted in the strands of the rotating elastic rope 17. The other state is the state that the toothless position of the incomplete gear 25 is close to the transmission gear 26. At this time, the movable block is not affected by the torque, but is rotated by the restoring force of the rotating elastic rope 17. At this time, the strands are in a dispersed state. During this state, the hair debris twisted on the rotating elastic rope 17 is released and falls into the hair debris collection groove 14.

[0043] The lint collecting groove 14 penetrates through one of the side walls of the water tank 11 , and one end of the lint collecting groove 14 penetrating through the water tank 11 is lower than the other end of the lint collecting groove 14 , so that the lint can be discharged outward along the inclined direction.

[0044] In the lint removing device 1 introduced above, the rotation of the lint sticking belt 18 can stir the water body to drive the scum to float above the liquid surface along the straight section of the lint sticking belt 18 and adhere to the lint sticking belt 18. In addition, since the lint sticking belt 18 has a double-layer structure, with a wire mesh 181 on the outer layer and a water-permeable sponge 182 on the inner layer, when the first pulley 12 contacts the lint sticking belt 18, it can squeeze out the water in the water-permeable sponge 182, making the water content of the lint in this area very low. The water squeezing process can reversely clean the wire mesh 181, and the lint is more easily pulled out by the elastic pull rope 17. During the process of the lint sticking 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 body. Then, when the second pulley 13 squeezes the sponge, this part of the air can be squeezed out, which is equivalent to an aeration action, making the floating lint in the water body tend to float. Therefore, this solution not only utilizes a lint scraping structure that is simpler than the prior art, but also can perform actions such as reverse suction of the wire mesh 181, sending air into the water, and squeezing out air at the bottom of the water to form bubbles. The traditional lint scraping structure is much more complex and requires much more space compared with this solution. This solution continuously retrieves the lint scum multiple times and volatilizes it during the process of retrieving the lint scum. It is a space-saving and low-cost treatment method.

[0045] As Figure 7 、 Figure 8 and Figure 9 shown, the cooling box 4 includes a box body 41, several upper partition plates 42 located inside the box body 41, and lower partition plates 43 arranged between adjacent upper partition plates 42. There is a gap between the upper partition plate 42 and the bottom of the box body 41, and there is a gap between the lower partition plate 43 and the top of the box body 41. The upper partition plate 42 forms a cloth-passing groove one 44 on the box body 41 that penetrates the upper surface, the front side, and the rear side of the box body 41, and the lower partition plate 43 forms a cloth-passing groove two 45 on the box body 41 that penetrates the upper surface, the front side, and the rear side of the box body 41.

[0046] Since the existing full-process printing and dyeing wastewater treatment process requires multiple precipitations, multiple oxidations, flocculations, and filtrations, it occupies a large area and has a high cost, while the actual recovered benefits are minimal. Therefore, this solution optimizes it by only performing one treatment in the factory area, namely, removing dandruff, volatilizing, and precipitating, and then sending it to a professional secondary treatment enterprise.

[0047] Compared with the existing dandruff removal filtration, this solution first uses the sticky belt 18 to "salvage" the dandruff and suspended matter in the sewage, making them "adhere" to the sticky belt 18, and then fixes one end of the elastic pull rope 17 and intermittently twists the other end to remove the dandruff and attachments adhering to the outer surface of the sticky belt 18. This removal method is different from scraping. It is a method of "rolling" away the adhering dandruff in the process of stretching and twisting multiple ropes, presenting an action of "pulling" the dandruff. After the multiple pull ropes rotate to separate from each other, the dandruff falls off and falls into the dandruff collection tank 14.

[0048] The cooling box 4 in the present scheme is a contact-free water cooling method, which utilizes the circuitous flow path formed by water flow in the box body 41 to form multiple cooling zones, namely, cloth threading groove 1 44 and cloth threading groove 2 45. The cloth to be cooled or the filament to be cooled can be passed through the cloth threading groove 1 44 and the cloth threading groove 2 45 to achieve auxiliary cooling, or multiple cloth threading grooves 1 44 and the cloth threading groove 2 45 can be connected in series for multiple times. Multiple cooling methods replace traditional air cooling to achieve better cooling effect. Since the sewage is converted into normal temperature sewage after volatilization and sedimentation treatment, it can absorb the heat of the cloth to be cooled or the filament to be cooled to achieve a cooling effect.

[0049] like Figure 1 As shown, the hot printing and dyeing wastewater is first subjected to volatile matter dispersal and dander removal treatment; specifically, the volatile matter is dispersed simultaneously during the process of removing dander, and the hot sewage just discharged is immediately subjected to volatile matter dispersal treatment, which is beneficial to the improvement of the volatilization efficiency of volatile matter. In addition, its pH is adjusted to be acidic; it is necessary to list the volatile and non-volatile substances in the printing and dyeing wastewater, among which volatile substances include volatile organic substances remaining in dyes, auxiliaries and cleaning agents, containing benzene series, formaldehyde, alcohols, ketones, esters, halogenated hydrocarbons, ammonia gas formed by the decomposition of ammonia by ammonia water and nitrogen-containing organic substances used in the printing and dyeing process, hydrogen sulfide gas formed by the decomposition of hydrogen sulfide dyes and the reduction of sulfates under anaerobic conditions, and some other volatile substances such as acetic acid, formic acid, phenols, amines, etc. Although ammonia gas is more likely to volatilize in an alkaline environment, hydrogen sulfide , phenols, amines, etc. are more likely to volatilize under acidic conditions. Ammonia itself is highly volatile. Therefore, when controlling the pH value of wastewater, it is adjusted to acidic conditions for dander treatment and volatile matter dispersal. Industrial acetic acid can be used to adjust the pH value. 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 printing and dyeing wastewater mainly include inorganic salts, heavy metal ions, macromolecular organic matter, suspended matter, a small amount of difficult-to-degrade organic matter, a small amount of non-volatile acid and non-volatile alkali, among which the suspended matter is 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 to the cooling box 4 with the sewage, and is sent to the secondary sewage treatment plant after cooling and utilization.

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

[0051] After the wastewater has been subjected to volatile substance dispersion and suspended solid removal, there is no difference in its physical properties from ordinary industrial wastewater, and it can be directly stored on the surface or transported through pipelines to the sewage treatment plant for secondary treatment.

[0052] Therefore, the basic logic of this solution is as follows: Some of the treatment processes of the printing and dyeing wastewater are carried out on one's own to make it form sewage that does not volatilize and does not precipitate. This part of the sewage can be transported over a long distance through pipelines and is also convenient for harmless storage. The sewage from multiple enterprises in the area can be transported through pipelines to a sewage treatment plant that specializes in secondary treatment. In this way, during the simple primary treatment process in the factory area, neither much site space is occupied, nor can the sewage after primary treatment be stored at low cost. After being transported through pipelines to the designated sewage secondary treatment enterprise, the sewage secondary treatment enterprise can also store and treat this part of the sewage in an open - ended manner, and the cost is relatively low. Carrying out dandruff removal, volatilization and precipitation treatment is not only for the convenience of harmless storage, but also to avoid blockage and fouling of the transportation pipeline, and can also greatly extend the maintenance cycle of the cooling tank 4. For industrial cluster areas and areas with tight industrial land, especially for small and medium - sized chemical fiber processing enterprises, this can not only save costs, give full play to the cost advantages of centralized treatment, but also greatly reduce the site occupation caused by sewage treatment and improve the factory environment.

[0053] The method of secondary treatment is common in the existing technology and can be used to centrally treat the sewage transported from multiple factory areas, which is carried out specifically after checking the sewage parameters. The purpose of this solution is to propose its own preliminary treatment to make it in a state of low - cost storage and low - cost transportation, and then transport it to the sewage treatment plant for secondary treatment. The method of secondary treatment can be carried out according to needs, and the secondary treatment process will not be elaborated in detail.

[0054] The specific embodiments described in this article are only examples to illustrate the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications, supplements, or use similar methods to replace the described specific embodiments, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A printing and dyeing wastewater reuse system, characterized in that It includes a lint removing device (1), a sedimentation tank (3) and a cooling tank (4). The lint removing device (1) includes a water tank (11) and a number of lint removing components arranged at intervals along the length direction of the water tank (11). The lint removing components include a lint collecting structure and a lint removing structure. The lint collecting structure includes a pulley one (12) rotatably connected above the liquid level of the water tank (11), a pulley two (13) rotatably connected below the liquid level of the water tank (11), a lint sticking belt (18) tractioned between the pulley one (12) and the pulley two (13), and a lint collecting groove (14) located above the liquid level of the water tank (11); the plane where the axis of the pulley one (12) and the axis of the pulley two (13) cooperating with it are located forms an angle of 20 - 70° with the liquid level in the water tank (11), the lint collecting groove (14) is located below the pulley one (12), the lint removing structure includes a fixed block (15) fixed on the side wall of the water tank (11) and a rotating block (16) rotatably connected on another side wall of the water tank (11), and a number of rotating elastic ropes (17) are connected between the fixed block (15) and the rotating block (16). In the natural state, the rotating elastic ropes (17) are parallel to each other, and in the natural state, the rotating elastic ropes (17) are separated from each other and have a spacing; the pulley two (13) is continuously rotated by power, the rotating elastic ropes (17) abut against the outer side surface of the lint sticking belt (18), and the rotating block (16) is intermittently rotated by power; One end of the water tank (11) is for water inlet, and the other end of the water tank (11) is for water outlet. The lint - free sewage discharged from the water tank (11) enters the sedimentation tank (3), and the supernatant of the sedimentation tank (3) is communicated with the water inlet end of the cooling tank (4).

2. The printing and dyeing wastewater reuse system according to claim 1, wherein, A motor (21) is arranged on the side wall of the water tank (11), a driving gear (22) is arranged on the output shaft of the motor (21), a driven gear (23) is fixed on the wheel shaft where each pulley two (13) is located, and a toothed belt (24) is tractioned between each driven gear (23) and the driving gear (22).

3. The printing and dyeing wastewater reuse system according to claim 2, wherein, An incomplete gear (25) is fixed on the wheel shaft of the pulley one (12), a transmission gear (26) is fixed on the movable block, and the incomplete gear (25) can be engaged with the transmission gear (26).

4. The printing and dyeing wastewater reuse system according to claim 2, wherein, The lint collecting groove (14) penetrates through one side wall of the water tank (11), and the end of the lint collecting groove (14) penetrating through the water tank (11) is lower than the other end of the lint collecting groove (14).

5. The printing and dyeing wastewater reuse system according to claim 2, characterized in that, The cooling box (4) includes a box body (41), several upper partition plates (42) located inside the box body (41), and lower partition plates (43) arranged between adjacent upper partition plates (42). There is a gap between the upper partition plate (42) and the bottom of the box body (41), and there is a gap between the lower partition plate (43) and the top of the box body (41). The upper partition plate (42) forms a first cloth-passing groove (44) on the box body (41) that penetrates the upper surface, front side, and rear side of the box body (41). The lower partition plate (43) forms a second cloth-passing groove (45) on the box body (41) that penetrates the upper surface, front side, and rear side of the box body (41).

6. The printing and dyeing wastewater reuse system according to claim 2, wherein The lint-removing tape (18) has a double-layer structure, with a metal wire mesh (181) on the outer layer and a water-permeable sponge (182) on the inner layer.

7. The printing and dyeing wastewater reuse system according to claim 2, wherein The sedimentation tank (3) is an inclined tube sedimentation tank (3).

8. A method for reusing printing and dyeing wastewater, characterized in that, It includes the following steps: A. Use the printing and dyeing wastewater reuse system described in any one of claims 1, 2, 3, 4, and 6 to simultaneously complete the removal of volatile substances and lint from the printing and dyeing wastewater; B. Perform sedimentation treatment on the treated sewage; C. Use the cooling box (4) described in claim 5 to cool the fabric in a non-contact manner during the fabric processing process with the supernatant after sedimentation; D. Transport the used sewage to the printing and dyeing sewage secondary treatment plant through a pipeline.

9. The method for reusing printing and dyeing wastewater according to claim 8, wherein In step A, adjust the sewage to acidic, collect the volatile substances during agitation, and treat the volatile substances by adsorption and temporary storage or incineration; monitor the water content of the sewage volatile substances in real time. After the water content of the sewage volatile substances is higher than 95%, the sewage can be sent to the sedimentation tank (3).

10. The method for reusing printing and dyeing wastewater according to claim 8, characterized in that, In step C, the sewage after sedimentation passes through the cooling box (4), and the synthetic fiber melt-spun filament to be cooled or the fabric to be cooled can pass through the first cloth-passing groove (44) and the second cloth-passing groove (45).

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