CN220352413U - Direct cyclic utilization device for intermittently discharging printing and dyeing washing wastewater - Google Patents

Abstract

The utility model provides a direct recycling device for intermittently discharging printing and dyeing washing wastewater, which comprises an intermittent dyeing machine, wherein a drain pipe is connected at the right outlet of the intermittent dyeing machine in a threaded manner. The utility model recycles the washing wastewater, the dyeing process involves a plurality of washing links, the types of chemical substances contained in the dyed washing links are similar, intermittent drainage is adopted to singly discharge the last washing wastewater with lighter pollution, and the last washing wastewater is directly recycled after no treatment, and the device can recycle the last washing wastewater to the previous N-1, N-2, N-3 and N- (N-1) pass washing links; other heavily polluted wastewater is discharged into a sewage treatment plant for physical and chemical treatment, the targeted treatment of the wastewater is realized, the quality of the wastewater is divided into water under the condition that the quality of the fabric is not influenced, the water quality of the wastewater can be lower than that of the reuse water or the discharge water, the process is simple, a large amount of water resources are saved, the generation of the wastewater is reduced, and the energy consumption and the material consumption of the sewage treatment are reduced.

Description

Direct cyclic utilization device for intermittently discharging printing and dyeing washing wastewater

Technical Field

The utility model belongs to the technical field of textile industry, in particular to a direct recycling device for intermittently discharging printing and dyeing washing wastewater, and the utility model can realize recycling of the washing wastewater, and a rear washing link is recycled to a front washing link, for example, the washing wastewater generated by an N-1 washing link can be recycled to N-2, N-3 and N- (N-1) washing links.

Background

The traditional centralized treatment and centralized recycling mode is to mix the wastewater of each link for unified physical and chemical treatment, mix the wastewater with lighter pollution with the wastewater with serious pollution, and increase recycling difficulty. If the printing and dyeing wastewater enters a sewage treatment plant, the printing and dyeing wastewater is recycled, so that the consumption of the subsequent membrane treatment seeds to a membrane device is reduced, and a large amount of water resources can be saved.

Data statistics, about 60% -90% of the process water is typically used for rinsing and washing, which is easily cleaned and recycled into the process. The washing process almost involves dyeing and finishing each process, the water consumption is large, and along with the replacement of the washing water, the water quality pollution is lightened, and the direct recycling value of the washing wastewater is increased. However, the dyeing and finishing wastewater is directly recycled without any treatment at present, and the existing wastewater recycling device is not applicable to the technical field. Therefore, the problems existing in the prior art are solved, and the defects existing in the prior art are as follows: the waste of water resources is serious, the waste water treatment effect is poor, and the energy consumption of sewage treatment can not be reused.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a direct recycling device for intermittently discharging printing and dyeing washing wastewater, the innovation recycles the washing wastewater, a plurality of washing links are involved in the dyeing process, chemical substances contained in the dyed washing links are similar, intermittent drainage is adopted to discharge the last washing wastewater with lighter pollution independently, and the last washing wastewater is directly recycled after no treatment, so that the device can recycle the last washing wastewater to the previous N-1, N-2, N-3 and N- (N-1) pass washing links; other wastewater with heavy pollution is discharged into a sewage treatment plant for physical and chemical treatment, the targeted treatment of the wastewater is realized, the quality of the wastewater is lower than that of recycled water or discharged water under the condition of not affecting the quality of fabrics, the process is simple, a large amount of water resources are saved, the generation of the wastewater is reduced, and the energy consumption and the material consumption of the sewage treatment are reduced, wherein the utility model is realized by the following technical scheme:

a direct recycling device for intermittently discharging printing and dyeing washing wastewater comprises an intermittent dyeing machine, wherein a PLC is installed on the upper portion of the intermittent dyeing machine through screws, the intermittent dyeing machine is electrically connected with the PLC, a drain pipe is connected to the right side outlet of the intermittent dyeing machine through threads, an N-time washing tank is connected to the right end of the drain pipe through threads, a drain guide pipe is connected to the left upper outlet of the N-time washing tank through threads, the drain guide pipe is arranged into two sections, a drain valve I is installed at the joint of the drain guide pipes of the two sections, and a wastewater tank is connected to the upper end of the drain guide pipe through threads;

the inlet of the right upper side of the N-time washing tank is in threaded connection with a direct recycling pipe, the inlet of the right upper end of the direct recycling pipe is in threaded connection with a three-way pipe, the lower end of the vertical section of the three-way pipe is in threaded connection with a recycling pipe I, the lower end of the recycling pipe is in threaded connection with an N-number wastewater recovery tank, the outlet of the lower part of the N-number wastewater recovery tank is in threaded connection with a water washing pipe, the lower end of the water washing pipe is in threaded connection with a drainage valve II, and the lower end of the drainage valve II is in threaded connection with the N-time washing tank;

the water treatment device comprises a three-way pipe, a return pipe, a suction pump, a recycling pipe II, a drainage pipe, a drainage valve III, a water washing tank and a fresh water injection assembly, wherein the return pipe is connected to the right end of the three-way pipe in a threaded manner, the suction pump is connected to the right lower end of the return pipe in a threaded manner, the N-number waste water recovery tank is connected to the outlet of the lower end of the suction pump in a threaded manner, the recycling pipe II is connected to the outlet of the left lower side of the N-number waste water recovery tank in a threaded manner, the drainage pipe is connected to the inlet of the right lower side of the N-number waste water recovery tank in a threaded manner, the drainage valve III is connected to the lower end of the drainage pipe in a threaded manner, the water washing tank is connected to the lower end of the drainage valve III in a threaded manner, and the fresh water injection assembly is installed on the right upper side of the N-number water washing tank.

Preferably, a soaping pipe is arranged at the outlet of the left lower side of the N-time washing tank, a soaping valve is connected to the right side of the soaping pipe in a threaded manner, the soaping tank is connected to the left end of the soaping pipe in a threaded manner, and a delivery pipe is connected to the outlet of the upper part of the soaping tank in a threaded manner.

Preferably, the lower part of the eduction tube is also connected with a eduction valve in a threaded manner, the upper end of the eduction tube is connected with a wastewater collection tank in a threaded manner, and the N-number wastewater recovery tank are both connected with a wastewater stirring assembly.

Preferably, the fresh water injection assembly comprises a filter tank, a filter pipe is connected to an inlet of the upper portion of the filter tank in a threaded manner, a baffle ring is connected to the left lower side of the inside of the filter pipe in a threaded manner, an adsorption core is arranged inside the filter pipe, a connecting pipe joint is connected to the upper end of the filter pipe in a threaded manner, a filter core is arranged inside the filter tank, and a water injection pipe with a valve is connected to an outlet of the lower portion of the filter tank in a threaded manner.

Preferably, the adsorption core adopts a cylindrical activated carbon adsorption core and is arranged on the upper part of the baffle ring.

Preferably, the filter core adopts a cylindrical stainless steel net core and is connected with the filter tank through screws.

Preferably, the lower end of the water injection pipe with the valve is connected with the inlet on the right upper side of the N times of water washing tanks in a threaded manner.

Preferably, the waste water stirring assembly adopts two, and all includes agitator motor, is connected with the rotation axis in agitator motor output shaft left end transmission to bearing connection has the mount pad on rotation axis left end, and from left to right equidistant bolted connection has the puddler in proper order at the rotation axis outer wall, and from the top down equidistant threaded connection has cotton string in proper order at the puddler outer wall.

Preferably, the stirring motor is connected to the N-type wastewater recovery tank and the middle part of the right side of the N-type wastewater recovery tank through bolts.

Preferably, the output shafts of the stirring motors penetrate through the N-type wastewater recovery tank and the right side inside the N-type wastewater recovery tank.

Preferably, the installation seats are all connected to the middle parts of the inner left walls of the N-type wastewater recovery tank and the N-type wastewater recovery tank through bolts.

Preferably, the stirring rod adopts a plurality of stainless steel square rods, the stirring rod is obliquely arranged, and the cotton thread hanging strip adopts a stainless steel strip.

Preferably, the stirring motor adopts a 48V medium-sized motor.

Preferably, the suction pump adopts an RS-25/6 stainless steel mute circulating pump, and the stirring motor and the suction pump are electrically connected with the PLC.

Compared with the prior art, the utility model has the beneficial effects that:

1. in the utility model, the types of chemical substances contained in the dyed washing links are similar, intermittent drainage is adopted to independently discharge the last washing wastewater with lighter pollution and the last washing wastewater is recycled to the previous N-1 washing links, so that the treatment is highly targeted and the effect is obvious; and the recycled washing wastewater only needs to meet the washing requirement, the quality of the fabric is not affected, and the water quality can be lower than that of the discharged water and the reclaimed water up to the standard, so that the process is simple, the treatment difficulty is reduced, the water resource is saved, and the quality-dividing water is realized.

2. According to the utility model, an intermittent drainage method is adopted, so that the rear washing wastewater is effectively separated and recycled to the front washing link, the generation of printing and dyeing wastewater can be reduced under the condition that the quality of fabrics is not affected, and the washing wastewater can be effectively saved by 50% -70% by recycling the washing wastewater in the existing washing process.

3. According to the utility model, with the continuous replacement of water in water washing, the chemical dyes and auxiliaries contained in the final water washing are less, and the color difference of the fabric subjected to water washing and fresh water washing treatment by adopting the final washing wastewater containing the dyes or auxiliaries with different concentrations is compared, so that the color difference is controlled within 0.8, and the same washing effect as that of the fresh water can be achieved.

4. In the utility model, after the water washing process is determined, fresh water is injected into the last water washing of the cotton fabric, the discharged washing wastewater enters the N-number wastewater recovery tank, and the second batch of cotton fabric which adopts the same process is washed for N-1 times or N-2 times to take the water stored in the N-number wastewater recovery tank, so that the recycling operation is convenient.

5. In the utility model, the washing wastewater discharged from the N-1 times of washing of cotton fabrics using the same process is fed into the N-1 wastewater recovery tank, and the water stored in the N-1 or N wastewater recovery tank is taken out from the N-2 times of washing of cotton fabrics using the same process.

6. In the utility model, the washing wastewater discharged by the third batch of cotton fabrics using the same process for N-2 times of washing is put into a preset N-2 number wastewater recovery tank, and the fourth batch of cotton fabrics using the same process for N-3 times of washing uses the water stored in the N-2 number or N-1 number or N number wastewater recovery tank; and the washing steps are analogized to the first washing step, so that the washing wastewater is directly recycled to the subsequent washing links from the cotton fabrics N-1 to N- (N-1) of the next batch without treatment.

7. In the utility model, the washing wastewater discharged from the first water washing and the wastewater generated by soaping are discharged into a wastewater pool due to high concentration of chemical components, so that the wastewater is not suitable for direct recycling, and the recycling selectivity is ensured.

8. According to the utility model, the subsequent use effect is ensured by filtering fresh water, the fresh water is subjected to primary filtration through the adsorption core arranged in the filter pipe at the upper part of the filter tank, and then is subjected to deep secondary filtration adsorption through the filter core inside, so that the filtering effect of the fresh water can be ensured, the subsequent use effect is ensured, the water injection pipe with the valve can be conveniently introduced and controlled, and the operation is convenient.

9. According to the utility model, the cotton thread in the wastewater is wound and collected, so that the utilization rate of reuse water is ensured, the rotation shaft is driven to rotate in the installation seat by the stirring motor, the cotton thread collecting effect can be ensured by the cooperation of the stirring rod and the cotton thread hanging strip, and the condition that the reuse water blocks a pipeline is avoided.

10. In the utility model, infrared spectrophotometers are arranged in the wastewater tank and the wastewater collecting tank, and a spectrum analysis technology is used, the infrared spectrophotometers are used for monitoring the components of dye and auxiliary agents in the wastewater in real time, identifying the changes of the components of the dye and the auxiliary agents which cannot be identified by naked eyes of human beings, judging that the wastewater cannot be recycled when the components in the wastewater are monitored to exceed the standard, and judging that the wastewater cannot be recycled when the components in the wastewater do not exceed the standard.

11. According to the utility model, the on-line infrared detectors are arranged beside the N-1 wastewater recovery tank and the N-1 wastewater recovery tank, so that the concentration changes of the dye and the auxiliary agent are monitored in real time, whether the wastewater meets the recycling requirement is judged, and the concentration changes of the dye and the auxiliary agent can be monitored by matching with the spectrum monitors arranged on one sides of the N-1 wastewater recovery tank and the N-1 wastewater recovery tank, so that the wastewater can be immediately judged to be directly recycled, and data reference is provided for subsequent wastewater treatment, so that unnecessary energy consumption and material consumption are saved; and the water discharged into the recovery tank is subjected to concentration monitoring on the dye and the auxiliary agent by using a spectrum monitor, when the concentration of each substance in the wastewater is in a range allowing recycling, the wastewater is directly recycled, and if the concentration is detected to exceed the standard, the wastewater is discharged into a wastewater pool, and the wastewater is not recycled.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic perspective view of the fresh water injection assembly of fig. 1 according to the present utility model.

Fig. 3 is a schematic top view of the wastewater agitation assembly of fig. 1 in accordance with the present utility model.

In the figure:

1. an intermittent dyeing machine; 2. a drain pipe; 3. a water washing pool for N-2 times; 4. a drainage guide pipe; 5. a first drainage valve; 6. a wastewater tank; 7. directly recycling the recycling pipe; 8. a three-way pipe; 9. recycling the first pipe; 10. n-1 number waste water recovery box; 11. washing the calandria with water; 12. a second drainage valve; 13. a water washing pool for N-1 times; 14. a return pipe; 15. a suction pump; 16. a No. N wastewater recovery tank; 17. recycling the second pipe; 18. a drainage conduit; 19. a water discharge valve III; 20. a water washing pool for N times; 21. a fresh water injection assembly; 22. a soaping tube; 23. a soaping valve; 24. a soaping pool; 25. a delivery tube; 26. a lead-out valve; 27. a wastewater collection tank; 28. a wastewater stirring assembly; 29. a filter tank; 30. a filter tube; 31. a baffle ring; 32. an adsorption core; 33. a connecting pipe joint; 34. a filter element; 35. a water injection pipe with a valve; 36. a stirring motor; 37. a rotation shaft; 38. a mounting base; 39. a stirring rod; 40. cotton thread hanging strip.

Detailed Description

The utility model is specifically described below with reference to the accompanying drawings, as shown in fig. 1, a direct recycling device for intermittently discharging printing and dyeing washing wastewater comprises an intermittent dyeing machine 1, wherein a PLC is installed on the upper part of the intermittent dyeing machine 1 through screws, the intermittent dyeing machine 1 is electrically connected with the PLC, a drain pipe 2 is connected at the right side outlet of the intermittent dyeing machine 1 through threads, an N-2 times water washing tank 3 is connected at the right end of the drain pipe 2 through threads, a drain guide pipe 4 is connected at the left upper outlet of the N-2 times water washing tank 3 through threads, the drain guide pipe 4 is arranged into two sections, a drain valve I5 is installed at the joint of the drain guide pipes 4 of the two sections, and a wastewater tank 6 is connected at the upper end of the drain guide pipe 4 through threads;

the upper right inlet of the N-2 times water washing tank 3 is in threaded connection with a direct recycling pipe 7, the upper right inlet of the direct recycling pipe 7 is in threaded connection with a three-way pipe 8, the lower end of the vertical section of the three-way pipe 8 is in threaded connection with a recycling pipe I9, the lower end of the recycling pipe I9 is in threaded connection with an N-1 wastewater recycling tank 10, the lower outlet of the N-1 wastewater recycling tank 10 is in threaded connection with a water washing pipe 11, the lower end of the water washing pipe 11 is in threaded connection with a water draining valve II 12, the lower end of the water draining valve II 12 is in threaded connection with an N-1 times water washing tank 13, washing wastewater generated by a plurality of water washing processes after dyeing cotton fabrics is directly recycled without any treatment, the device can realize the cyclic utilization of the washing wastewater, for example, the washing wastewater generated by the N-1 channel washing process can be recycled to the N-2, N-3 and N- (N-1) channel washing process, the generation of wastewater is directly reduced by 50%, the subsequent quality and the fresh water consumption are reduced, and the fresh water consumption is realized;

the right end of the three-way pipe 8 is in threaded connection with a return pipe 14, the right lower end of the return pipe 14 is in threaded connection with a suction pump 15, the lower left outlet of the suction pump 15 is in threaded connection with a No. N wastewater recovery tank 16, the lower left outlet of the No. N wastewater recovery tank 16 is in threaded connection with a recycling pipe II 17, the lower right inlet of the No. N wastewater recovery tank 16 is in threaded connection with a drainage conduit 18, the lower end of the drainage conduit 18 is in threaded connection with a drainage valve III 19, the lower end of the drainage valve III 19 is in threaded connection with an N-time water washing tank 20, the upper right side of the N-time water washing tank 20 is provided with a fresh water injection assembly 21, the lower left outlet of the N-1-time water washing tank 13 is provided with a soaping pipe 22, the right side of the soaping pipe 22 is in threaded connection with a soaping valve 23, the left end of the soaping pipe 22 is in threaded connection with a soaping tank 24, the upper outlet of the soaping tank 24 is in threaded connection with a drainage conduit 25, the lower part of the drainage conduit 25 is in threaded connection with a drainage valve 26, the upper end of the drainage conduit 25 is in threaded connection with a drainage conduit II, the drainage conduit N-1 is in turn, and the upper end of the drainage conduit II is in threaded connection with a water tank 19, and the water tank II is in turn in the circulation of the water recovery tank 1-N-1, and the water is in the water tank; the primary washing wastewater and the soaping wastewater are discharged into a wastewater collecting tank 27 through corresponding pipelines for physical and chemical treatment, and an N-1 wastewater recycling tank 10 and an N wastewater recycling tank 16 are connected with a wastewater stirring assembly 28, so that the device can recycle the last washing wastewater to the previous N-1, N-2, N-3 and N- (N-1) pass washing links; other heavily polluted wastewater is discharged into a sewage treatment plant for physical and chemical treatment, the targeted treatment of the wastewater is realized, the quality of the wastewater is divided into water under the condition that the quality of the fabric is not influenced, the water quality of the wastewater can be lower than that of the reuse water or the discharge water, the process is simple, a large amount of water resources are saved, the generation of the wastewater is reduced, and the energy consumption and the material consumption of the sewage treatment are reduced;

an infrared spectrophotometer is arranged in each of the wastewater tank 6 and the wastewater collection tank 27, and a spectrum analysis technology is used, the infrared spectrophotometer is arranged for monitoring the components of the dye and the auxiliary agent in the wastewater in real time, recognizing the changes of the components of the dye and the auxiliary agent which cannot be recognized by naked eyes of human beings, judging that the wastewater cannot be recycled when the components in the wastewater are monitored to exceed the standard, and judging that the wastewater can be recycled when the components in the wastewater do not exceed the standard;

on-line infrared detectors are arranged beside the N-1 wastewater recovery tank 10 and the N-1 wastewater recovery tank 16, the concentration changes of dyes and auxiliaries are monitored in real time, whether the wastewater meets the recycling requirement is judged, and the concentration changes of the dyes and the auxiliaries can be monitored by matching with the spectrum monitors arranged on one sides of the N-1 wastewater recovery tank 10 and the N-1 wastewater recovery tank 16, so that whether the wastewater can be directly recycled can be judged immediately, data reference is provided for subsequent wastewater treatment, and unnecessary energy consumption and material consumption are saved; the water discharged into the recovery tank is subjected to concentration monitoring on the dye and the auxiliary agent by using a spectrum monitor, when the concentration of each substance in the wastewater is in a range allowing recycling, the wastewater is directly recycled, and if the concentration is detected to exceed the standard, the wastewater is discharged into a wastewater tank and is not recycled;

and infrared spectrophotometer, the equal electric connection PLC of online infrared detector and spectrum monitor can carry out automated control to carry out the monitoring display operation of data in real time, PLC wherein adopts FX2N-48 type from taking the PLC of LED liquid crystal touch screen, guarantees to control the convenience.

In this embodiment, referring to fig. 2, the fresh water injection assembly 21 includes a filter tank 29, a filter pipe 30 is screwed to an inlet at an upper portion of the filter tank 29, a baffle ring 31 is screwed to a left lower side inside the filter pipe 30, and an adsorption core 32 is provided inside the filter pipe 30, so that fresh water can be filtered, a connection pipe joint 33 is screwed to an upper end of the filter pipe 30, connection is facilitated, operation is facilitated, a filter core 34 is provided inside the filter tank 29, a water injection pipe 35 with a valve is screwed to an outlet at a lower portion of the filter tank 29, the adsorption core 32 is a cylindrical activated carbon adsorption core and is arranged on an upper portion of the baffle ring 31, the filter core 34 is a cylindrical stainless steel mesh core, a filtering effect is improved, a water washing effect is guaranteed, and the adsorption core is screwed to the filter tank 29, the lower end of the water injection pipe 35 is screwed to an inlet at an upper right side of the N-time water washing tank 20, and can be opened and closed, so that water washing operation is facilitated.

In this embodiment, combine the figure 3 to show, waste water stirring subassembly 28 adopt two, and all include agitator motor 36, be connected with rotation axis 37 at agitator motor 36 output shaft left end transmission to bearing connection has mount pad 38 in rotation axis 37 left end, guarantee rotational stability, and equidistant bolted connection has puddler 39 from left to right in proper order at rotation axis 37 outer wall, and equidistant threaded connection has cotton thread hanging strip 40 in proper order from the top down at puddler 39 outer wall, can collect the winding to the cotton thread in the waste water, be convenient for clear up, improve waste water treatment effect, agitator motor 36 equal bolted connection at the right side middle part of N-1 waste water recovery tank 10 and N waste water recovery tank 16, agitator motor 36's output shaft all run through the inside of the right side of N-1 waste water recovery tank 10 and N waste water recovery tank 16, mount pad 38 equal bolted connection in the inboard left wall middle part of N-1 waste water recovery tank 10 and N waste water recovery tank 16, puddler 39 adopt a plurality of stainless steel square bars, and puddler 39 slope setting, waste water hanging strip 40 adopt the stainless steel thread, guarantee waste water treatment effect, guarantee waste water treatment efficiency.

The working process of the utility model is as follows: the device can realize recycling of the washing wastewater, and the latter washing step is recycled to the former washing step, for example, the washing wastewater generated in the N-1 washing step can be recycled to the N-2, N-3 and N- (N-1) washing steps, and the method directly reduces the generation of wastewater, saves 50% -70% of fresh water, reduces the material consumption and energy consumption caused by the subsequent treatment of wastewater, and realizes the quality-dividing water consumption; each pipeline respectively discharges first washing wastewater, soaping wastewater, second washing wastewater and the like, a three water discharge valve 19 after N times of water washing is opened, water is discharged into an N-number wastewater recovery tank, and then the water stored in the N-number wastewater recovery tank 16 is used for N-1 or N-2..N- (N-1) of the next batch of fabrics, so that the washing wastewater can be recycled in turn; the primary washing wastewater and the soaping wastewater are discharged into a wastewater collecting tank 27 through corresponding pipelines for physical and chemical treatment, and an N-1 wastewater recycling tank 10 and an N wastewater recycling tank 16 are connected with a wastewater stirring assembly 28, so that the device can recycle the last washing wastewater to the previous N-1, N-2, N-3 and N- (N-1) pass washing links; other heavily polluted wastewater is discharged into a sewage treatment plant for physical and chemical treatment, the targeted treatment of the wastewater is realized, the quality of the wastewater is divided into water under the condition that the quality of the fabric is not influenced, the water quality of the wastewater can be lower than that of the reuse water or the discharge water, the process is simple, a large amount of water resources are saved, the generation of the wastewater is reduced, and the energy consumption and the material consumption of the sewage treatment are reduced.

By using the technical scheme of the utility model or under the inspired by the technical scheme of the utility model, a similar technical scheme is designed by a person skilled in the art, so that the technical effects are achieved, and the technical effects fall into the protection scope of the utility model.

Claims (10)

1. The direct recycling device for intermittently discharging printing and dyeing washing wastewater comprises an intermittent dyeing machine (1) and is characterized in that a drain pipe (2) is connected to the right side outlet of the intermittent dyeing machine (1) in a threaded manner, a PLC is installed on the upper portion of the intermittent dyeing machine (1) through screws, the intermittent dyeing machine (1) is electrically connected with the PLC, an N-2 times water washing tank (3) is connected to the right end of the drain pipe (2) in a threaded manner, a drain guide pipe (4) is connected to the left upper outlet of the N-2 times water washing tank (3) in a threaded manner, the drain guide pipe (4) is arranged into two sections, a drain valve I (5) is installed at the joint of the drain guide pipes (4) of the two sections, and a wastewater tank (6) is connected to the upper end of the drain guide pipe (4) in a threaded manner;

the right upper inlet of the N-2 times water washing tank (3) is in threaded connection with a direct recycling pipe (7), the right upper inlet of the direct recycling pipe (7) is in threaded connection with a three-way pipe (8), the lower end of the vertical section of the three-way pipe (8) is in threaded connection with a recycling pipe I (9), the lower end of the recycling pipe I (9) is in threaded connection with an N-1 time wastewater recovery tank (10), the lower outlet of the N-1 time wastewater recovery tank (10) is in threaded connection with a water washing drain pipe (11), the lower end of the water washing drain pipe (11) is in threaded connection with a drainage valve II (12), and the lower end of the drainage valve II (12) is in threaded connection with an N-1 time water washing tank (13);

a return pipe (14) is connected to the right end of the three-way pipe (8) in a threaded manner, a suction pump (15) is connected to the right lower end of the return pipe (14) in a threaded manner, an N-number wastewater recovery tank (16) is connected to the lower outlet of the suction pump (15) in a threaded manner, a recycling pipe II (17) is connected to the lower left outlet of the N-number wastewater recovery tank (16) in a threaded manner, a drainage guide pipe (18) is connected to the lower right inlet of the N-number wastewater recovery tank (16) in a threaded manner, a drainage valve III (19) is connected to the lower end of the drainage guide pipe (18) in a threaded manner, an N-number water washing tank (20) is connected to the lower end of the drainage valve III (19) in a threaded manner, a fresh water injection assembly (21) is installed on the upper right side of the N-number water washing tank (20), a soaping pipe (22) is installed at the lower left outlet of the N-1-number water washing tank (13), a soaping valve (23) is also connected to the right side of the soaping pipe, a soaping pipe (24) is connected to the left end of the soaping pipe (22) in a threaded manner, and a soaping pipe (24) is connected to the upper outlet (25) in a threaded manner;

an infrared spectrophotometer is arranged in each of the wastewater tank (6) and the wastewater collecting tank (27);

an on-line infrared detector is arranged beside the N-1 wastewater recovery tank (10) and the N-1 wastewater recovery tank (16);

a spectrum monitor is arranged on one side of the N-1 wastewater recovery tank (10) and one side of the N-1 wastewater recovery tank (16), and the infrared spectrophotometer is electrically connected with the PLC.

2. The direct recycling device for intermittently discharging printing and dyeing washing wastewater according to claim 1, wherein the lower part of the delivery pipe (25) is further connected with a delivery valve (26) in a threaded manner, the upper end of the delivery pipe (25) is connected with a wastewater collection tank (27) in a threaded manner, and the N-1 wastewater recovery tank (10) and the N wastewater recovery tank (16) are connected with a wastewater stirring assembly (28).

3. The direct recycling device for intermittent discharge of printing and dyeing washing wastewater according to claim 1, wherein the fresh water injection assembly (21) comprises a filter tank (29), a filter pipe (30) is connected at an inlet at the upper part of the filter tank (29) in a threaded manner, a baffle ring (31) is connected at the lower left side inside the filter pipe (30) in a screwed manner, an adsorption core (32) is arranged inside the filter pipe (30), a connecting pipe joint (33) is connected at the upper end of the filter pipe (30) in a threaded manner, a filter element (34) is arranged inside the filter tank (29), and a water injection pipe (35) with a valve is connected at an outlet at the lower part of the filter tank (29) in a threaded manner.

4. A direct recycling device for intermittently discharging printing and dyeing washing wastewater according to claim 3, wherein the adsorption core (32) is a cylindrical activated carbon adsorption core and is arranged at the upper part of the baffle ring (31), and the filter core (34) is a cylindrical stainless steel net core and is connected with the filter tank (29) by screws.

5. A direct recycling device for intermittently discharging printing and dyeing washing wastewater according to claim 3, wherein the lower end of the water injection pipe (35) with a valve is connected with the inlet on the right upper side of the N times of water washing tank (20) in a threaded manner.

6. The direct recycling device for intermittently discharging printing and dyeing washing wastewater according to claim 2, wherein the wastewater stirring assemblies (28) are two and comprise stirring motors (36), a rotating shaft (37) is connected to the left end of an output shaft of each stirring motor (36) in a transmission manner, a mounting seat (38) is connected to the left end of each rotating shaft (37) in a bearing manner, stirring rods (39) are sequentially connected to the outer wall of each rotating shaft (37) in an equidistant manner from left to right, and cotton thread hanging strips (40) are sequentially connected to the outer wall of each stirring rod (39) in an equidistant manner from top to bottom.

7. The direct recycling device for intermittently discharging printing and dyeing washing wastewater according to claim 6, wherein the stirring motors (36) are connected to the middle parts of the right sides of the N-1 wastewater recycling bin (10) and the N-1 wastewater recycling bin (16) through bolts.

8. The direct recycling device for intermittently discharging printing and dyeing wastewater according to claim 6, wherein the output shafts of the stirring motor (36) penetrate through the inside of the right sides of the N-1 wastewater recovery tank (10) and the N-1 wastewater recovery tank (16).

9. The direct recycling device for intermittently discharging printing and dyeing washing wastewater according to claim 6, wherein the installation seats (38) are connected to the middle parts of the inner left walls of the N-1 wastewater recycling bin (10) and the N-1 wastewater recycling bin (16) through bolts.

10. The direct recycling device for intermittently discharging printing and dyeing washing wastewater according to claim 6, wherein the stirring rod (39) is a plurality of stainless steel square rods, the stirring rod (39) is obliquely arranged, and the cotton thread hanging strip (40) is a stainless steel strip.