3, 3 '-dichlorobenzidine hydrochloride neutralization wastewater treatment system and treatment method

Abstract

The invention relates to the technical field of waste water neutralization, in particular to a method for preparing 3, 4-difluorobenzene. The invention discloses a 3, 3 '-dichlorobenzidine hydrochloride neutralization wastewater treatment system and method, the system comprises a neutralization tank, a stirring unit, a discharge pipe, a PH value sensor, a liquid level sensor and a cleaning assembly, the cleaning assembly comprises two filter plates, a circulating pump, a transfer unit and a plurality of first nozzles, liquid is discharged out of the neutralization tank, and precipitates, impurities or suspended solids are filtered through the filter plates; filtrate is conveyed to the transfer unit through a circulating pump; the filtrate is sprayed out from a plurality of first spray heads and uniformly flushes off sediments, impurities or suspended matters attached to the interior of the neutralization tank; according to the utility model, the waste liquid after neutralization is discharged and filtered, and then the filtered filtrate flows back into the neutralization tank to wash attached sediments, impurities or suspended matters, so that the internal sediments, impurities or suspended matters are cleaned through repeated circulating filtration, and the quality of subsequent catalytic oxidation is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater neutralization, and particularly to a 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system and a treatment method. Background Art

[0002] 3,3'-dichlorobenzidine hydrochloride, abbreviated as DCB, is an important organic compound and is widely used in pigment production. In terms of preparation, 3,3'-dichlorobenzidine hydrochloride is usually prepared from o-nitrochlorobenzene as a raw material, reduced under alkaline conditions, and then obtained through a series of chemical reactions. However, a large amount of wastewater is generated during the preparation process. In order for the wastewater to meet the discharge standards, the catalytic oxidation method is usually used. By dropping the collected wastewater lye into the neutralization wastewater to form a weak alkalinity, at this time, the impurities and suspended solids generated in the weakly alkaline wastewater need to be filtered out first, and then transported to the reactor, filled with a high-efficiency catalyst for catalytic oxidation reaction, and finally meet the discharge requirements.

[0003] In the aforementioned prior art, the strongly alkaline wastewater of 3,3'-dichlorobenzidine hydrochloride is usually stirred and mixed inside the tank body during neutralization. At this time, due to the presence of organic or inorganic substances in the wastewater, the neutralization reaction will cause polymerization or flocculation, generating a large amount of impurities and suspended solids; in order to ensure the quality of the neutralization wastewater and be able to smoothly enter the reactor subsequently and avoid blocking the reactor, it is necessary to filter the neutralization wastewater. After the impurities and suspended solids are generated, they will adhere to the inner wall of the tank body and the stirrer; however, the current traditional method only relies on setting a filter screen during discharge and cannot clean the impurities and suspended solids adhering to the inside of the tank body. Over time, it will cause the accumulation of impurities inside the tank body, which is likely to affect the neutralization operation of the waste liquid and reduce the neutralization efficiency and quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system and a treatment method, which solve the problem that after impurities and suspended solids are generated in the prior art, they will adhere to the inner wall of the tank body and the stirrer; however, the current traditional method only relies on setting a filter screen during discharge and cannot clean the impurities and suspended solids adhering to the inside of the tank body. Over time, it will cause the accumulation of impurities inside the tank body, which is likely to affect the neutralization operation of the waste liquid and reduce the neutralization efficiency and quality.

[0005] To achieve the above purpose, the present invention provides a 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system, including a neutralization tank, a stirring unit, a discharge pipe, a pH sensor, a liquid level sensor, and a cleaning component. The stirring unit is arranged inside the neutralization tank, the discharge pipe is communicated with the lower part of the neutralization tank, and both the pH sensor and the liquid level sensor are arranged inside the neutralization tank;

[0006] The cleaning component includes two filter plates, a circulation pump, a transfer unit, and multiple first spray heads. The two filter plates are both arranged on one side of the neutralization tank. The water inlet end of the circulation pump is arranged on one side of the filter plate. The transfer unit is arranged at the water outlet end of the circulation pump. The transfer unit is located inside the neutralization tank. The multiple first spray heads are sequentially arranged on the transfer unit.

[0007] Among them, the stirring unit includes a stirring component, a stirring shaft, multiple stirring plates, multiple bottom stirring rods, multiple U-shaped rods, and multiple bottom rotating plates. The stirring component is arranged above the neutralization tank. The output end of the stirring component is fixedly connected to one end of the stirring shaft. The other end of the stirring shaft penetrates through the neutralization tank and is located inside the neutralization tank. The multiple stirring shafts are sequentially distributed around the outer wall of the stirring shaft. The multiple bottom stirring rods are sequentially distributed at the other end of the stirring shaft. The multiple U-shaped rods are sequentially arranged on the inner bottom wall of the neutralization tank. The multiple bottom rotating plates are respectively sleeved on the outer walls of the corresponding U-shaped rods. The bottom rotating plates are rotatably connected to the U-shaped plates.

[0008] Among them, the transfer unit includes a fixed groove, a rotating groove, two sliding rings, two sealing rings, and multiple second spray heads. The rotating groove has multiple flow grooves, and all the multiple flow grooves are communicated with the fixed groove. The fixed groove is fixedly connected to the neutralization tank and is located on the inner wall of the neutralization tank. The rotating groove is installed inside the fixed groove. The rotating groove is fixedly connected to the stirring shaft and is sleeved on the outer wall of the stirring shaft. The two sliding rings are both fixedly connected to the rotating groove and are sequentially sleeved on the outer wall of the rotating groove. The two sliding rings are both slidably connected to the fixed groove. The two sealing rings are both fixedly connected to the fixed groove and are located at the connection between the fixed groove and the rotating groove. The multiple second spray heads are all communicated with the rotating groove and are sequentially distributed below the rotating groove.

[0009] Among them, the cleaning component further includes a feeding unit, and the feeding unit is arranged on the neutralization tank;

[0010] The feeding unit includes a feeding bin, a feeding pump, a feeding pipe, a fixed seat, and an electronic valve. The fixed seat has an annular communication groove. The stirring shaft has a plurality of feeding holes and a feeding channel. The feeding bin is arranged above the neutralization tank. The feeding pump is arranged inside the feeding bin. The fixed seat is arranged inside the neutralization tank. The fixed seat is rotatably connected to the stirring shaft and sleeved on the outer wall of the stirring shaft. One end of the feeding pipe is communicated with the water outlet end of the feeding pump. The other end of the feeding pipe penetrates through the feeding bin and the neutralization tank and is communicated with the annular communication groove of the fixed seat. The annular communication groove is communicated with the plurality of feeding holes. The feeding holes are communicated with the feeding channel. The electronic valve is arranged inside the feeding channel.

[0011] Wherein, the cleaning assembly further includes a circulation channel, a valve mechanism, and a filter plate cleaning unit. The circulation channel is communicated with the neutralization tank and is located on one side of the neutralization tank. The valve mechanism is arranged inside the circulation channel. The filter plate cleaning unit is arranged inside the circulation channel. The circulation pump is arranged at one end of the circulation channel. The water inlet end of the circulation pump is communicated with the circulation channel.

[0012] Wherein, the valve mechanism includes a valve driving component and a ball valve. The valve driving component is arranged on one side of the circulation channel. The output end of the valve driving component penetrates through the circulation channel and is fixedly connected to the ball valve. The ball valve is adapted to the circulation channel.

[0013] Wherein, the filter plate cleaning unit includes a filter plate lifting component, a U-shaped plate, a sliding plate, a filter plate flipping component, a flipping shaft, two sealing gaskets, and a backwashing mechanism. The neutralization tank has a sliding groove. The filter plate lifting component is arranged on one side of the neutralization tank and above the circulation channel. The output end of the filter plate lifting component is fixedly connected to the U-shaped plate. One end of the sliding plate is slidably connected to the sliding groove. The other end of the sliding plate is fixedly connected to the U-shaped plate. The output end of the filter plate flipping component is fixedly connected to one side of the U-shaped plate. The output end of the filter plate flipping component penetrates through the U-shaped plate and is fixedly connected to the flipping shaft. The flipping shaft is rotatably connected to the U-shaped plate. The two filter plates are symmetrically arranged outside the flipping shaft. The circulation channel has a slotted opening. The slotted opening is adapted to the filter plate. The two sealing gaskets are respectively arranged on the corresponding filter plates. The sealing gaskets are adapted to the slotted opening. The backwashing mechanism is arranged on one side of the neutralization tank.

[0014] Among them, the backwashing mechanism includes a water tank, a backwashing pump body, a telescopic hose, a fixed pipe, a backwashing nozzle, a nozzle moving component, a baffle, and a collection box. The collection box is placed below the circulation pump, the water tank is placed on one side of the collection box, the backwashing pump body is arranged inside the water tank, both ends of the telescopic hose are respectively communicated with the water outlet end of the backwashing pump body and one end of the fixed pipe, the other end of the fixed pipe is communicated with the backwashing nozzle, the nozzle moving component is arranged above the water tank, and the output end of the nozzle moving component is fixedly connected with the fixed pipe. The baffle is arranged above the backwashing pump body and on one side of the filter plate.

[0015] The present invention also provides a method for treating the neutralization wastewater of 3,3'-dichlorobenzidine hydrochloride, which adopts the above-mentioned 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system, and includes the following steps:

[0016] Pre-store neutral wastewater in the neutralization tank;

[0017] Slowly transport the strongly alkaline waste liquid generated during the preparation process of 3,3'-dichlorobenzidine hydrochloride into the neutralization tank;

[0018] Start the stirring unit to mix the strongly alkaline waste liquid and the neutral wastewater until the pH is maintained between 4 and 5, then stop transporting the strongly alkaline waste liquid. At this time, in a weakly alkaline environment, organic substances begin to precipitate, polymerization or flocculation reactions occur, and precipitates, impurities or suspended substances appear;

[0019] Discharge the liquid from the neutralization tank, and filter the precipitates, impurities or suspended substances through the filter plate;

[0020] The filtrate is transported to the transfer unit through the circulation pump;

[0021] The filtrate is sprayed out from multiple first nozzles, evenly flushing the precipitates, impurities or suspended substances attached to the inside of the neutralization tank, and then continuing to flow to the filter plate for filtration. This cycle continues until it is cleaned;

[0022] Discharge the cleaned filtrate from the neutralization tank and enter the subsequent reactor for catalytic oxidation.

[0023] A 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system and treatment method of the present invention first stores neutral wastewater in the neutralization tank in advance; slowly transports the strongly alkaline waste liquid generated during the preparation of 3,3'-dichlorobenzidine hydrochloride to the neutralization tank; then starts the stirring unit to mix the strongly alkaline waste liquid and the neutral wastewater until the pH sensor monitors that the pH remains between 4 and 5, and then stops transporting the strongly alkaline waste liquid. At this time, in a weakly alkaline environment, organic substances begin to precipitate, polymerization or flocculation reactions occur, and precipitates, impurities or suspended substances appear; discharge the liquid from the neutralization tank, and filter the precipitates, impurities or suspended substances through the filter plate; the filtrate is transported to the transfer unit through the circulation pump; the filtrate is sprayed out from multiple first nozzles to uniformly wash down the precipitates, impurities or suspended substances attached to the inside of the neutralization tank, and then continues to flow to the filter plate for filtration; finally, discharge the cleaned filtrate from the neutralization tank and enter the subsequent reactor for catalytic oxidation; through the above structural settings, discharge and filter the neutralized waste liquid, and then use the filtered filtrate to flow back into the neutralization tank to wash the attached precipitates, impurities or suspended substances, and then repeatedly circulate and filter to clean the attached precipitates, impurities or suspended substances inside, avoiding accumulation and causing the efficiency and quality of the subsequent neutralized waste liquid. Due to the improvement of the quality of the neutralized waste liquid, the quality of the subsequent catalytic oxidation is also greatly improved, and the operation is automatic. Even after long-term use, it does not require manual intervention for cleaning, significantly improving the efficiency of neutralized waste liquid treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0025] Figure 1 is a schematic structural diagram of a 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system of the present invention.

[0026] Figure 2 is a cross-sectional view of a 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system of the present invention.

[0027] Figure 3 is of the present invention Figure 2 enlarged partial structural view of part A.

[0028] Figure 4 is of the present invention Figure 2 enlarged partial structural view of part B.

[0029] Figure 5 is of the present invention Figure 2 enlarged partial structural view of part C.

[0030] Figure 6It is the internal structure diagram of the neutralization tank of the present invention.

[0031] Figure 7 It is the structural schematic diagram of the stirring unit of the present invention.

[0032] Figure 8 It is the structural schematic diagram of the filter plate cleaning unit of the present invention.

[0033] Figure 9 It is the step flow chart of the method for treating the neutralization wastewater of 3,3'-dichlorobenzidine hydrochloride of the present invention.

[0034] 1 - Neutralization tank, 2 - Discharge pipe, 3 - pH value sensor, 4 - Liquid level sensor, 5 - Filter plate, 6 - Circulation pump, 7 - First spray head, 8 - Stirring component, 9 - Stirring shaft, 10 - Stirring plate, 11 - Bottom stirring rod, 12 - U-shaped rod, 13 - Bottom rotating plate, 14 - Fixed groove, 15 - Rotating groove, 16 - Sliding ring, 17 - Sealing ring, 18 - Second spray head, 19 - Collection box, 20 - Flow-through groove, 21 - Feeding bin, 22 - Feeding pump, 23 - Feeding pipe, 24 - Fixed seat, 25 - Electronic valve, 26 - Annular communication groove, 27 - Feeding hole, 28 - Feeding channel, 29 - Circulation channel, 30 - Valve driving component, 31 - Ball valve, 32 - Filter plate lifting component, 33 - U-shaped plate, 34 - Slide plate, 35 - Filter plate flipping component, 36 - Flipping shaft, 37 - Sealing gasket, 38 - Chute, 39 - Groove opening, 40 - Water tank, 41 - Backwashing pump body, 42 - Telescopic hose, 43 - Fixed pipe, 44 - Backwashing spray head, 45 - Spray head moving component, 46 - Baffle. Detailed implementation mode

[0035] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0036] Please refer to Figures 1 to 8, the present invention provides a neutralization wastewater treatment system for 3,3'-dichlorobenzidine hydrochloride, comprising a neutralization tank 1, a stirring unit, a discharge pipe 2, a pH sensor 3, a liquid level sensor 4 and a cleaning assembly. The cleaning assembly includes two filter plates 5, a circulation pump 6, a transfer unit and a plurality of first spray heads 7. The stirring unit includes a stirring member 8, a stirring shaft 9, a plurality of stirring plates 10, a plurality of bottom stirring rods 11, a plurality of U-shaped rods 12 and a plurality of bottom rotating plates 13. The transfer unit includes a fixed groove 14, a rotating groove 15, two sliding rings 16, two sealing rings 17 and a plurality of second spray heads 18. The rotating groove 15 has a plurality of flow grooves 20. The cleaning assembly further includes a feeding unit, which includes a feeding bin 21, a feeding pump 22, a feeding pipe 23, a fixed seat 24 and an electronic valve 25. The fixed seat 24 has an annular communication groove 26. The stirring shaft 9 has a plurality of feeding holes 27 and a feeding channel 28. The cleaning assembly further includes a circulation channel 29, a valve mechanism and a filter plate cleaning unit. The valve mechanism includes a valve driving member 30 and a ball valve 31. The filter plate cleaning unit includes a filter plate lifting member 32, a U-shaped plate 33, a sliding plate 34, a filter plate flipping member 35, a flipping shaft 36, two sealing gaskets 37 and a backwashing mechanism. The neutralization tank 1 has a sliding groove 38. The backwashing mechanism includes a water tank 40, a backwashing pump body 41, a telescopic hose 42, a fixed pipe 43, a backwashing spray head 44, a spray head moving member 45, a baffle 46 and a collection box 19.

[0037] Among them, the stirring unit is arranged inside the neutralization tank 1. The discharge pipe 2 communicates with the lower part of the neutralization tank 1. The pH sensor 3 and the liquid level sensor 4 are both arranged inside the neutralization tank 1. The two filter plates 5 are both arranged on one side of the neutralization tank 1. The water inlet end of the circulation pump 6 is arranged on one side of the filter plate 5. The transfer unit is arranged at the water outlet end of the circulation pump 6. The transfer unit is located inside the neutralization tank 1. The plurality of first spray heads 7 are sequentially arranged on the transfer unit.

[0038] First, store neutral wastewater in the neutralization tank 1 in advance; slowly transport the strongly alkaline waste liquid generated during the preparation of 3,3'-dichlorobenzidine hydrochloride to the neutralization tank 1; then start the stirring unit to mix the strongly alkaline waste liquid and neutral wastewater until the pH sensor 3 monitors that the pH remains between 4 and 5, and then stop transporting the strongly alkaline waste liquid. At this time, it is in a weakly alkaline environment, and organic substances begin to precipitate, and polymerization or flocculation reactions occur, resulting in precipitates, impurities or suspended matters; drain the liquid from the neutralization tank 1, and filter the precipitates, impurities or suspended matters through the filter plate 5; the filtrate is transported to the transfer unit through the circulation pump 6; the filtrate is sprayed out from multiple first nozzles 7 to evenly wash down the precipitates, impurities or suspended matters adhering to the inside of the neutralization tank 1, and then continue to flow to the filter plate 5 for filtration; finally, drain the cleaned filtrate from the neutralization tank 1 and send it to the subsequent reactor for catalytic oxidation.

[0039] Secondly, the stirring member 8 is arranged above the neutralization tank 1, the output end of the stirring member 8 is fixedly connected to one end of the stirring shaft 9, the other end of the stirring shaft 9 penetrates through the neutralization tank 1 and is located inside the neutralization tank 1. A plurality of the stirring shafts 9 are sequentially distributed around the outer wall of the stirring shaft 9. A plurality of the bottom stirring rods 11 are sequentially distributed at the other end of the stirring shaft 9. A plurality of the U-shaped rods 12 are sequentially arranged on the inner bottom wall of the neutralization tank 1. A plurality of the bottom rotating plates 13 are respectively sleeved on the outer walls of the corresponding U-shaped rods 12, and the bottom rotating plates 13 are rotatably connected to the U-shaped plates 33. The stirring member 8 is a motor. When the stirring member 8 is started, it drives the stirring shaft 9 to rotate, thereby causing a plurality of the stirring plates 10 and the bottom stirring rods 11 to rotate, mixing the strongly alkaline waste liquid and the neutral waste liquid to make them react fully. At the same time, when the bottom stirring rods 11 rotate, they will drive the bottom rotating plates 13 located on the U-shaped rods 12 to rotate, and further stir and mix the liquid in the area of the inner bottom wall of the neutralization tank 1 by relying on the bottom rotating plates 13, greatly improving the mixing uniformity and avoiding the liquid at the bottom from not being stirred and mixed.

[0040] Meanwhile, the rotating groove 15 has a plurality of circulation grooves 20, and the plurality of circulation grooves 20 are all communicated with the fixed groove 14. The fixed groove 14 is fixedly connected to the neutralization tank 1 and is located on the inner wall of the neutralization tank 1. The rotating groove 15 is installed inside the fixed groove 14, fixedly connected to the stirring shaft 9, and sleeved on the outer surface of the stirring shaft 9. Both of the sliding rings 16 are fixedly connected to the rotating groove 15 and are sequentially sleeved on the outer surface of the rotating groove 15. Both of the sliding rings 16 are slidably connected to the fixed groove 14. Both of the sealing rings 17 are fixedly connected to the fixed groove 14 and are located at the connection between the fixed groove 14 and the rotating groove 15. The plurality of second nozzles 18 are all communicated with the rotating groove 15 and are sequentially distributed below the rotating groove 15. When the liquid flows back into the fixed groove 14, it can enter the inside of the rotating groove 15 by relying on the circulation grooves 20. At this time, the filtrate is sprayed inside the neutralization tank 1 by relying on the second nozzles 18 to achieve the flushing effect. At the same time, when the stirring shaft 9 rotates, it drives the rotating groove 15 to rotate. At this time, it drives the plurality of first nozzles 7 and the second nozzles 18 to rotate, and thus the rotating spraying can be carried out, significantly increasing the coverage area of the spraying. At the same time, the inner wall of the neutralization tank 1 can be flushed by relying on the first nozzles 7, and the stirring shaft 9, the stirring rods and the stirring rods can be flushed by the second nozzles 18. In addition, when the rotating groove 15 rotates, the sliding rings 16 slide inside the fixed groove 14 to maintain the stability of the rotating groove 15, and the sealing rings 17 seal the rotating connection to prevent liquid leakage.

[0041] In addition, the feeding unit is arranged on the neutralization tank 1; the fixing seat 24 has an annular communication groove 26, the stirring shaft 9 has a plurality of feeding holes 27 and a feeding channel 28, the feeding bin 21 is arranged above the neutralization tank 1, the feeding pump 22 is arranged inside the feeding bin 21, the fixing seat 24 is arranged inside the neutralization tank 1, the fixing seat 24 is rotatably connected to the stirring shaft 9 and sleeved on the outer wall of the stirring shaft 9, one end of the feeding pipe 23 is communicated with the water outlet end of the feeding pump 22, the other end of the feeding pipe 23 penetrates through the feeding bin 21 and the neutralization tank 1 and is communicated with the annular communication groove 26 of the fixing seat 24, the annular communication groove 26 is communicated with the plurality of feeding holes 27, the feeding holes 27 are communicated with the feeding channel 28, and the electronic valve 25 is arranged inside the feeding channel 28. Strongly alkaline waste liquid is stored in the feeding bin 21, and then is slowly pumped into the feeding pipe 23 by the feeding pump 22 and flows into the annular communication groove 26. At this time, the strongly alkaline waste liquid enters the feeding channel 28 through the feeding holes 27 and finally enters the neutralization tank 1 to be mixed with the neutral waste liquid, and then the stirring starts; at this time, the electronic valve 25 can be closed to prevent liquid backflow; in addition, when pumping the strongly alkaline waste liquid, the stirring shaft 9 can also rotate slowly for mixing. Thus, while inputting the waste liquid, mixing is carried out, which can improve the neutralization efficiency and effect.

[0042] Then, the circulation channel 29 is communicated with the neutralization tank 1 and is located on one side of the neutralization tank 1. The valve mechanism is arranged inside the circulation channel 29, the filter plate cleaning unit is arranged inside the circulation channel 29, the circulation pump 6 is arranged at one end of the circulation channel 29, and the water inlet end of the circulation pump 6 is communicated with the circulation channel 29. After the valve mechanism is opened, the liquid with a reduced pH value can be transported into the circulation channel 29. At this time, impurity filtration can be carried out through the filter plate 5. After the filtration is completed, the filter plate 5 is cleaned by the filter plate cleaning unit.

[0043] Furthermore, the valve driving component 30 is arranged on one side of the circulation channel 29. The output end of the valve driving component 30 penetrates through the circulation channel 29 and is fixedly connected to the ball valve 31, and the ball valve 31 is adapted to the circulation channel 29. The valve driving component 30 is a self-locking motor. When the valve driving component 30 is started, it drives the ball valve 31 to rotate and open, and then the liquid with a reduced pH value flows into the circulation channel 29. At the same time, the circulation pump 6 is opened, which will accelerate the flow of the liquid, and then the filtrate after impurity filtration is transported to the fixed groove 14.

[0044] Moreover, the neutralization tank 1 is provided with a chute 38. The filter plate lifting member 32 is arranged on one side of the neutralization tank 1 and above the circulation channel 29. The output end of the filter plate lifting member 32 is fixedly connected to the U-shaped plate 33. One end of the sliding plate 34 is slidably connected to the chute 38, and the other end of the sliding plate 34 is fixedly connected to the U-shaped plate 33. The output end of the filter plate flipping member 35 is fixedly connected to one side of the U-shaped plate 33. The output end of the filter plate flipping member 35 penetrates through the U-shaped plate 33 and is fixedly connected to the turning shaft 36. The turning shaft 36 is rotatably connected to the U-shaped plate 33. Two filter plates 5 are symmetrically arranged outside the turning shaft 36. The circulation channel 29 is provided with a slot 39, and the slot 39 is adapted to the filter plate 5. Two sealing gaskets 37 are respectively arranged on the corresponding filter plates 5, and the sealing gasket 37 is adapted to the slot 39. The backwashing mechanism is arranged on one side of the neutralization tank 1. The filter plate lifting member 32 is a self-locking cylinder. After filtering for a period of time, when it is necessary to clean the filter plate 5, first, the circulation channel 29 is closed by the ball valve 31, and then the filter plate lifting member 32 is started to drive the U-shaped plate 33 to move upward, so that the filter plate 5 is moved out of the circulation channel 29 through the slot 39. At this time, the filter plate flipping member 35 is started to drive the turning shaft 36 to rotate 180°, driving the two symmetrical filter plates 5 to exchange positions, so that the unused filter plate 5 above is moved to the lower part. The U-shaped plate 33 moves downward to insert the unused filter plate 5 back into the circulation channel 29 for use. At the same time, the sealing gasket 37 matches the slot 39 to achieve a sealing effect and avoid liquid leakage. At this time, the backwashing mechanism can be used to backwash the used filter plate 5 above for subsequent reuse. The filter plate lifting member 32 is a self-locking cylinder. When the U-shaped plate 33 moves up and down, the sliding plate 34 slides in the chute 38 to maintain the stability of the lifting.

[0045] Finally, the collection box 19 is placed below the circulation pump 6, the water tank 40 is placed on one side of the collection box 19, the backwashing pump body 41 is arranged inside the water tank 40, both ends of the telescopic hose 42 are respectively communicated with the water outlet end of the backwashing pump body 41 and one end of the fixed pipe 43, the other end of the fixed pipe 43 is communicated with the backwashing spray head 44, the spray head moving component 45 is arranged above the water tank 40, and the output end of the spray head moving component 45 is fixedly connected with the fixed pipe 43. The baffle 46 is arranged above the backwashing pump body 41 and on one side of the filter plate 5. Clean water is stored in the water tank 40. First, the spray head moving component 45 is started to drive the fixed pipe 43 to move, and the backwashing spray head 44 is moved to one side of the filter plate 5. At this time, the backwashing pump body 41 is started to pump out the clean water, which is sprayed out from the backwashing spray head 44 to backwash the filter plate 5. The water for backwashing is blocked by the baffle 46 to prevent the sewage from splashing and spreading outwards. Finally, the sewage falls and is collected by the collection box 19 for subsequent centralized treatment. When the backwashing is over, the backwashing spray head 44 is reset to make room for the subsequent flipping of the filter plate 5. The spray head moving component 45 is a self-locking cylinder.

[0046] When using a 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to this embodiment, first, neutral wastewater is pre-stored in the neutralization tank 1; the strongly alkaline waste liquid generated during the preparation of 3,3'-dichlorobenzidine hydrochloride is slowly transported into the neutralization tank 1.

[0047] Then the stirring component 8 is started to drive the stirring shaft 9 to rotate, so that a plurality of the stirring plates 10 and the bottom stirring rods 11 rotate to mix the strongly alkaline waste liquid and the neutral waste liquid, enabling them to fully react. At the same time, when the bottom stirring rods 11 rotate, the bottom rotating plate 13 located on the U-shaped rod 12 will be driven to rotate, and further, the liquid in the bottom wall area of the neutralization tank 1 can be stirred and mixed by relying on the bottom rotating plate 13 until the pH value sensor 3 monitors that the pH remains between 4 and 5, and then the transportation of the strongly alkaline waste liquid is stopped.

[0048] At this time, in a weakly alkaline environment, the organic matter begins to precipitate, polymerization or flocculation reactions occur, and precipitates, impurities or suspended matters appear. The liquid is discharged from the neutralization tank 1 and filtered through the filter plate 5 to remove the precipitates, impurities or suspended matters.

[0049] Then the filtrate is transported to the fixed tank 14 by the circulation pump 6. Depending on the circulation groove 20, it can enter the inside of the rotating tank 15. At this time, the filtrate is sprayed inside the neutralization tank 1 by the second spray head 18 to achieve the flushing effect. At the same time, when the stirring shaft 9 rotates, it drives the rotating tank 15 to rotate. At this time, it drives a plurality of the first spray heads 7 and the second spray head 18 to rotate, and thus can perform rotary spraying, significantly increasing the coverage area of spraying. At the same time, depending on the first spray head 7, the inner wall of the neutralization tank 1 can be flushed, and the second spray head 18 flushes the stirring shaft 9, the stirring rods and the stirring rods. Then it continues to flow to the filter plate 5 for filtration. By circulating and filtering in this way, the impurities adhering to the inside can be effectively cleaned. Finally, the cleaned filtrate is discharged from the neutralization tank 1 and enters the subsequent reactor for catalytic oxidation;

[0050] Through the above structural settings, the neutralized waste liquid is discharged and filtered, and then the filtered filtrate is returned to the neutralization tank 1 to flush the adhering precipitates, impurities or suspended matters. Then it circulates and filters repeatedly to clean the precipitates, impurities or suspended matters adhering to the inside, avoiding the accumulation from affecting the efficiency and quality of the subsequent neutralized waste liquid. Due to the improvement of the quality of the neutralized waste liquid, the quality of the subsequent catalytic oxidation is also greatly improved, and the operation is automatic. Even after long-term use, it does not require manual intervention for cleaning, significantly improving the efficiency of neutralized waste liquid treatment.

[0051] Please refer to Figure 9 , the present invention also provides a method for treating the neutralization wastewater of 3,3'-dichlorobenzidine hydrochloride, including the following steps:

[0052] S1: Pre-store neutral wastewater in the neutralization tank 1;

[0053] S2: Slowly transport the strongly alkaline waste liquid generated in the preparation process of 3,3'-dichlorobenzidine hydrochloride to the neutralization tank 1;

[0054] S3: Start the stirring unit to mix the strongly alkaline waste liquid and the neutral wastewater until the pH is maintained between 4 and 5, then stop transporting the strongly alkaline waste liquid. At this time, in a weakly alkaline environment, the organic matter begins to precipitate, and polymerization or flocculation reactions occur, resulting in precipitates, impurities or suspended matters;

[0055] S4: Drain the liquid from the neutralization tank 1 and filter the precipitates, impurities or suspended matters through the filter plate 5;

[0056] S5: Transport the filtrate to the transfer unit by the circulation pump 6;

[0057] S6: The filtrate is sprayed out from a plurality of the first spray heads 7 to uniformly wash down the precipitates, impurities or suspended matters adhering to the inside of the neutralization tank 1, and then continues to flow to the filter plate 5 for filtration. This cycle continues until it is cleaned up;

[0058] S7: Drain the cleaned filtrate out of the neutralization tank 1 and send it to the subsequent reactor for catalytic oxidation.

[0059] Among them, neutral wastewater is pre-stored in the neutralization tank 1; the strongly alkaline waste liquid generated during the preparation of 3,3'-dichlorobenzidine hydrochloride is slowly transported into the neutralization tank 1; start the stirring unit to mix the strongly alkaline waste liquid and the neutral wastewater until the pH is maintained between 4 and 5, then stop transporting the strongly alkaline waste liquid. At this time, in a weakly alkaline environment, organic substances begin to precipitate, polymerization or flocculation reactions occur, and precipitates, impurities or suspended matters appear; drain the liquid out of the neutralization tank 1, and filter the precipitates, impurities or suspended matters through the filter plate 5; the filtrate is transported to the transfer unit through the circulation pump 6; the filtrate is sprayed out from multiple first nozzles 7 to evenly wash down the precipitates, impurities or suspended matters adhering to the inside of the neutralization tank 1, and then continue to flow to the filter plate 5 for filtration. This cycle continues until it is cleaned; drain the cleaned filtrate out of the neutralization tank 1 and send it to the subsequent reactor for catalytic oxidation.

[0060] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand the whole or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system, comprising a neutralization tank, a stirring unit, a discharge pipe, a pH sensor and a liquid level sensor, wherein the stirring unit is arranged inside the neutralization tank, the discharge pipe is connected to the bottom of the neutralization tank, the pH sensor and the liquid level sensor are both arranged inside the neutralization tank, and characterized in that: Also includes a cleanup component; The cleaning assembly includes two filter plates, a circulation pump, a transfer unit and a plurality of first nozzles, the two filter plates are arranged on one side of the neutralization tank, the water inlet end of the circulation pump is arranged on one side of the filter plate, the transfer unit is arranged at the water outlet end of the circulation pump, the transfer unit is located inside the neutralization tank, and the plurality of first nozzles are arranged on the transfer unit in sequence.

2. The 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to claim 1, characterized in that: The stirring unit includes a stirring component, a stirring shaft, a plurality of stirring plates, a plurality of bottom stirring rods, a plurality of U-shaped rods and a plurality of bottom rotating plates. The stirring component is arranged above the neutralization tank, and the output end of the stirring component is fixedly connected to one end of the stirring shaft, and the other end of the stirring shaft passes through the neutralization tank and is located inside the neutralization tank. The plurality of stirring shafts are sequentially distributed around the outer wall of the stirring shaft, the plurality of bottom stirring rods are sequentially distributed at the other end of the stirring shaft, the plurality of U-shaped rods are sequentially arranged on the inner bottom wall of the neutralization tank, and the plurality of bottom rotating plates are respectively sleeved on the outer walls of the corresponding U-shaped rods, and the bottom rotating plate is rotatably connected to the U-shaped plate.

3. The 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to claim 2, characterized in that: The transfer unit includes a fixed groove, a rotating groove, two sliding rings, two sealing rings and multiple second nozzles. The rotating groove has multiple flow grooves, and multiple flow grooves are all connected to the fixed groove. The fixed groove is fixedly connected to the neutralization tank and is located on the inner wall of the neutralization tank. The rotating groove is installed inside the fixed groove. The rotating groove is fixedly connected to the stirring shaft and is sleeved on the outer wall of the stirring shaft. The two sliding rings are fixedly connected to the rotating groove and are sequentially sleeved on the outer wall of the rotating groove. The two sliding rings are slidably connected to the fixed groove. The two sealing rings are fixedly connected to the fixed groove and are located at the connection between the fixed groove and the rotating groove. Multiple second nozzles are all connected to the rotating groove and are distributed in sequence below the rotating groove.

4. The 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to claim 3, characterized in that: The cleaning assembly further comprises a feeding unit, and the feeding unit is arranged on the neutralization tank; The feeding unit includes a feeding bin, a feeding pump, a feeding pipe, a fixing seat and an electronic valve, the fixing seat has an annular connecting groove, the stirring shaft has a plurality of feeding holes and a feeding channel, the feeding bin is arranged above the neutralization tank, the feeding pump is arranged inside the feeding bin, the fixing seat is arranged inside the neutralization tank, the fixing seat is rotatably connected to the stirring shaft and is sleeved on the outer wall of the stirring shaft, one end of the feeding pipe is connected to the water outlet end of the feeding pump, the other end of the feeding pipe passes through the feeding bin and the neutralization tank, and is connected to the annular connecting groove of the fixing seat, the annular connecting groove is connected to the plurality of feeding holes, the feeding holes are connected to the feeding channel, and the electronic valve is arranged inside the feeding channel.

5. The 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to claim 4, characterized in that: The cleaning component also includes a circulation channel, a valve mechanism and a filter plate cleaning unit. The circulation channel is connected to the neutralization tank and is located on one side of the neutralization tank. The valve mechanism is arranged inside the circulation channel. The filter plate cleaning unit is arranged inside the circulation channel. The circulation pump is arranged at one end of the circulation channel. The water inlet end of the circulation pump is connected to the circulation channel.

6. The 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to claim 5, characterized in that: The valve mechanism includes a valve driving component and a ball valve. The valve driving component is arranged on one side of the circulation channel. The output end of the valve driving component passes through the circulation channel and is fixedly connected to the ball valve. The ball valve and the circulation channel are adapted to each other.

7. The 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to claim 6, characterized in that: The filter plate cleaning unit comprises a filter plate lifting component, a U-shaped plate, a slide plate, a filter plate flip component, a flip shaft, two sealing pads and a backwashing mechanism, the neutralization tank has a slide groove, the filter plate lifting component is arranged on one side of the neutralization tank and is located above the circulation channel, the output end of the filter plate lifting component is fixedly connected to the U-shaped plate, one end of the slide plate is slidably connected to the slide groove, the other end of the slide plate is fixedly connected to the U-shaped plate, the output end of the filter plate flip component is fixedly connected to one side of the U-shaped plate, the output end of the filter plate flip component passes through the U-shaped plate and is fixedly connected to the flip shaft, the flip shaft is rotatably connected to the U-shaped plate, the two filter plates are symmetrically arranged on the outside of the flip shaft, the circulation channel has a groove, the groove is adapted to the filter plate, the two sealing pads are respectively arranged on the corresponding filter plates, the sealing pad and the groove are adapted to each other, and the backwashing mechanism is arranged on one side of the neutralization tank.

8. The 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system according to claim 7, characterized in that: The backwashing mechanism includes a water tank, a backwashing pump body, a telescopic hose, a fixed pipe, a backwashing nozzle, a nozzle moving component, a baffle and a collecting box. The collecting box is placed below the circulating pump, the water tank is placed on one side of the collecting box, the backwashing pump body is arranged inside the water tank, the two ends of the telescopic hose are respectively connected to the water outlet end of the backwashing pump body and one end of the fixed pipe, the other end of the fixed pipe is connected to the backwashing nozzle, the nozzle moving component is arranged above the water tank, the output end of the nozzle moving component is fixedly connected to the fixed pipe, and the baffle is arranged above the backwashing pump body and is located on one side of the filter plate.

9. A method for treating 3,3'-dichlorobenzidine hydrochloride neutralization wastewater, using the 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system as claimed in claim 8, characterized in that: The steps include: Pre-storing neutral wastewater in the neutralization tank; Slowly conveying the strongly alkaline waste liquid generated in the preparation process of 3,3'-dichlorobenzidine hydrochloride into the neutralization tank; The stirring unit is started to mix the strongly alkaline waste liquid and the neutral waste water until the pH is maintained between 4 and 5, and then the conveying of the strongly alkaline waste liquid is stopped. At this time, the environment is weakly alkaline, and organic matter begins to precipitate, and polymerization or flocculation reaction occurs, resulting in the appearance of precipitates, impurities or suspended matter; Discharging the liquid from the neutralization tank and filtering the sediment, impurities or suspended matter through the filter plate; The filtrate is transported to the transfer unit through the circulation pump; The filtrate is sprayed out from the plurality of the first nozzles, evenly flushing the sediment, impurities or suspended matter attached to the inside of the neutralization tank, and then continues to flow to the filter plate for filtration, thus circulating until it is cleaned; The cleaned filtrate is discharged from the neutralization tank and enters the subsequent reactor for catalytic oxidation.

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