Wastewater extracting equipment for producing dioctyl terephthalate

Abstract

The invention belongs to the technical field of wastewater treatment equipment, and particularly relates to wastewater extraction equipment for producing dioctyl terephthalate, which comprises a main body, and the main body is internally divided into a flocculation zone, an anaerobic zone, an aerobic zone and a settling zone; sludge discharge plates are mounted on the bottom surfaces of the flocculation area and the sedimentation area, the upper surfaces of the sludge discharge plates are obliquely arranged, and cavities are formed in the sludge discharge plates and connected with air inlet control pipes; a mounting baffle is mounted in the flocculation area, magnetic blocks are symmetrically mounted on the mounting baffle, and a movable net is slidably mounted between the magnetic blocks; the lower end of the mounting baffle is not in contact with the bottom of the flocculation zone; the device is simple in structure, mixed wastewater is filtered and settled for multiple times, solid impurities in the wastewater are fully discharged, meanwhile, water flow is used for impacting and stirring from bottom to top, activated sludge is kept in a suspended state, uniformity and fluidity are improved, and the wastewater recycling effect is guaranteed to be improved.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment equipment, specifically a wastewater extraction device for the production of dioctyl terephthalate. Background Technology

[0002] Dioctyl terephthalate (DOTP) is an environmentally friendly new plasticizer that can replace DOP, boasting advantages such as low toxicity, high plasticizing efficiency, and strong oil resistance. With increasingly stringent regulations on the application of phthalate (DOP) plasticizers both domestically and internationally, DOTP plasticizers have experienced rapid development. Currently, my country is the world's largest producer of DOTP.

[0003] Industrially, it is produced by direct esterification of terephthalic acid (PAT) and isooctanol under the action of a catalyst. This method has a short process flow, relatively abundant raw material sources, and good product quality. However, the esterification process generates high-concentration wastewater containing isooctanol, n-butanol, DOTP, organic sodium salts, etc., which have certain biotoxicity to organisms and are easy to accumulate in organisms. However, the wastewater has low levels of ammonia nitrogen, TN, and TP. The main pollutants are petroleum hydrocarbons and COD.

[0004] Due to the characteristics of plasticizer wastewater, such as high pH value, high organic matter concentration, complex water quality, and difficulty in degradation, proper treatment of plasticizer wastewater generally requires multiple processes, including oil-water separation, chemical treatment, sedimentation, and biochemical treatment. Current plasticizer wastewater treatment processes are complex, involve numerous pieces of equipment, and occupy a large space, increasing the investment costs for enterprises. Furthermore, during wastewater mixing treatment, a large amount of solid impurities are mixed in, which can easily clog treatment equipment and affect its operation. Additionally, in the anaerobic and aerobic biochemical treatment stages, when using submersible mixers to agitate activated sludge, the activated sludge is prone to uneven distribution and poor flowability, affecting the effectiveness of biochemical treatment. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a wastewater lifting device for the production of dioctyl terephthalate. This device involves multiple filtrations and sedimentation of the mixed wastewater to fully remove solid impurities and improve wastewater recycling efficiency. Simultaneously, it elevates and lifts the activated sludge, using water flow to impact and agitate it from bottom to top, keeping the activated sludge in suspension, improving its uniformity and flowability, and ensuring the effectiveness of wastewater biochemical treatment.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The wastewater extraction equipment for the production of dioctyl terephthalate of the present invention includes a main body. A first partition, a second partition, and a third partition are installed in the main body from right to left. The main body is divided into a flocculation zone, an anaerobic zone, an aerobic zone, and a sedimentation zone from right to left. The flocculation zone is equipped with a liquid inlet and a first sludge outlet from top to bottom. The sedimentation zone is equipped with a liquid outlet and a second sludge outlet from top to bottom. A connecting port is opened at the upper end of the first partition, the second partition, and the third partition, and an intercepting net is installed at the connecting port. Aeration mechanisms are installed in the anaerobic and aerobic zones. A sludge discharge plate is installed on the bottom surface of the flocculation zone and sedimentation zone. The end of the sludge discharge plate near the sludge outlet is lower than the other end of the sludge discharge plate. The sludge discharge plate is made of rubber material and has a cavity inside. An air intake control pipe is connected to the cavity inside the sludge discharge plate. An installation baffle is installed in the flocculation zone. Magnetic blocks are symmetrically arranged on the installation baffle and the first partition. A movable net is vertically slidably installed between the symmetrically arranged magnetic blocks. There is a magnetic repulsion between the magnetic blocks and the frame of the movable net. The lower end of the mounting baffle does not contact the bottom of the flocculation zone. The wastewater in the flocculation zone flows from bottom to top through the movable net and reaches the communication port on the first partition. There is a height difference between the liquid levels on both sides of the mounting baffle.

[0007] Preferably, a guide plate is installed in the flocculation zone. The guide plate is located below the mounting baffle and there is a gap between the guide plate and the mounting baffle. The cross-section of the guide plate is inverted L-shaped. Part of the wastewater fed into the liquid inlet impacts the horizontal part of the guide plate, and the other part of the wastewater fed into the liquid inlet impacts the vertical part of the guide plate. The amount of wastewater impacting the horizontal part of the guide plate is less than the amount of wastewater impacting the vertical part. The wastewater fed into the inlet flows towards the movable net after impacting the horizontal part of the guide plate.

[0008] Preferably, the movable net includes a frame and a filter screen, the area of ​​the filter screen after being unfolded and flattened on a horizontal plane is larger than the area of ​​the frame, the filter screen is provided with multiple layers, and there are gaps between the filter screens.

[0009] Preferably, a collection plate is provided on the surface of the mud discharge plate, the collection plates are evenly distributed on the mud discharge plate, and the gaps between the collection plates form a collection trough; There is a blank area between the collecting trough and the edge of the mud discharge plate near the mud outlet.

[0010] Preferably, the collecting plate includes an elastic sheet and a shaping strip, the shaping strip being installed on the upper and lower sides of the elastic sheet, and the shaping strip below the elastic sheet being installed on the surface of the mud discharge plate; The shaping strip has evenly distributed slits, which divide the shaping strip into multiple independent units.

[0011] Preferably, activated sludge is placed in the anaerobic and aerobic zones, and isolation nets are installed in the anaerobic and aerobic zones. There is a gap between the bottom surface of the anaerobic and aerobic zones and the isolation nets. The activated sludge is placed above the isolation nets, and the aeration mechanism agitates the activated sludge above the isolation nets. Drainage pipes are installed on the first and second isolation plates, and the drainage pipes guide the wastewater discharged from the connection port to the space below the isolation nets before discharge. Drainage pipes are installed on the third isolation plate, and the drainage pipes on the third isolation plate guide the wastewater discharged from the connection port to the bottom of the sedimentation zone before discharge. The isolation net has a double-layer structure, with barrier sand filling the space between the two layers. The barrier sand is one or more common granular filter media, such as quartz sand, gravel, anthracite, and manganese sand. Both the anaerobic and aerobic zones are equipped with flow plates. In the anaerobic zone, one end of the flow plate is installed on the side wall near the liquid outlet, and there is a gap between the other end of the flow plate and the side wall near the liquid inlet. The end of the flow plate near the liquid inlet in the anaerobic zone is lower than the end of the flow plate near the liquid outlet.

[0012] Preferably, an elastic rod is installed above the flow plate, one end of the elastic rod is installed on the side wall near the liquid outlet in the anaerobic zone, and an impact ball is installed on the other end of the elastic rod. The impact ball is located in the gap between the flow plate and the side wall near the liquid inlet in the anaerobic zone, and the elastic rod is in contact with the upper surface of the flow plate. The intercepting net is installed on the connecting port at one end near the liquid inlet. The intercepting net is installed at an angle at the connecting port. The lower end of the intercepting net is flush with the end of the connecting port near the liquid inlet. The distance between the upper end of the intercepting net and the liquid inlet is less than the distance between the lower end of the intercepting net and the liquid inlet.

[0013] Preferably, baffles are installed in the anaerobic zone and the aerobic zone, and mounting rods are installed on the baffles. The upper end of the baffles does not contact the flow plate, and the lower end of the baffles does not contact the isolation net. The baffle is composed of flat-shaped airbags. The mounting rod has a cavity and an air inlet pipe is installed on the mounting rod. The air inlet pipe is connected to the airbag through the cavity. The surface of the airbag has micropores. The micropores on the airbag aerate the activated sludge in the anaerobic and aerobic zones. A cover plate is installed above the aerobic zone, which isolates the aerobic zone from the outside world to form a relatively closed space. A connecting pipe is installed on the cover plate, and the other end of the connecting pipe is connected to the air inlet pipe in the anaerobic zone.

[0014] The beneficial effects of this invention are as follows: 1. The wastewater extraction equipment for the production of dioctyl terephthalate described in this invention, by setting up a movable net, an interception net, a flocculation zone, and a sedimentation zone, utilizes domestic sewage and wastewater to mix, diluting the wastewater and reducing its concentration, thereby facilitating wastewater treatment. Simultaneously, the mixed wastewater passes through the movable net and multiple interception nets in the flocculation zone, where most impurities in the wastewater are fully flocculated, precipitated, and intercepted, preventing impurities from entering subsequent treatment stages and causing filter blockage in those stages. Furthermore, the multi-stage biological treatment and multi-stage sedimentation of the wastewater ensures the effectiveness of the treatment and facilitates wastewater recycling.

[0015] 2. The wastewater extraction equipment for the production of dioctyl terephthalate described in this invention, by setting up an isolation net, blocking sand, baffles, and flow plates, allows the wastewater to flow upward from the bottom of the activated sludge, impacting and agitating the activated sludge and separating it, thereby preventing the lateral movement of the activated sludge. Combined with the micropores on the baffles for aeration and agitation of the activated sludge, the activated sludge is kept in a suspended state, ensuring thorough mixing and contact between the activated sludge and the wastewater, thus improving the uniformity and flowability of the activated sludge. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the material lifting device of the present invention; Figure 2 This is a schematic diagram of the material lifting device of the present invention; Figure 3 This is a schematic diagram of the structure of the movable mesh in the feeding device of the present invention; Figure 4 This is a schematic diagram of the structure of the flow plate and elastic rod in the material lifting device of the present invention; Figure 5 This is a schematic diagram of the baffle plate in the material lifting device of the present invention; Figure 6 yes Figure 2 Enlarged view of a portion of point A in the middle; Figure 7 yes Figure 2 Enlarged view of a section at point B in the middle; In the diagram: Main body 1, Flocculation zone 11, First baffle 111, Anaerobic zone 12, Second baffle 121, Aerobic zone 13, Third baffle 131, Cover plate 132, Sedimentation zone 14, Liquid inlet 15, Liquid outlet 16, First sludge outlet 17, Second sludge outlet 18, Connecting port 19, Sludge discharge plate 2, Collection plate 21, Elastic sheet 211, Shaping strip 212, Air inlet control pipe 22, Drainage tube 3, Mounting baffle 4, Movable net 41, Net frame 411, Filter screen 412, Magnetic block 413, Guide plate 42, Isolation net 5, Barrier sand 51, Baffle 52, Mounting rod 521, Air inlet pipe 53, Connecting pipe 54, Flow plate 6, Elastic rod 61, Impact ball 611, Interception net 7. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] like Figures 1 to 7 As shown, the wastewater extraction equipment for the production of dioctyl terephthalate according to the present invention includes a main body 1. The main body 1 is equipped with a first partition 111, a second partition 121 and a third partition 131 installed from right to left. The main body 1 is divided into a flocculation zone 11, an anaerobic zone 12, an aerobic zone 13 and a sedimentation zone 14 from right to left. The flocculation zone 11 is equipped with an inlet 15 and a first sludge outlet 17 from top to bottom. The sedimentation zone 14 is equipped with an outlet 16 and a second sludge outlet 18 from top to bottom. The upper ends of the first partition 111, the second partition 121 and the third partition 131 are provided with a connecting port 19, and an intercepting net 7 is installed at the connecting port 19. Aeration mechanisms are installed in the anaerobic zone 12 and the aerobic zone 13. A mud discharge plate 2 is installed on the bottom surface of the flocculation zone 11 and the sedimentation zone 14. One end of the mud discharge plate 2 near the mud outlet is lower than the other end of the mud discharge plate 2. The mud discharge plate 2 is made of rubber material and has a cavity inside. An air intake control pipe 22 is connected to the cavity inside the mud discharge plate 2. An installation baffle 4 is installed in the flocculation zone 11. Magnetic blocks 413 are symmetrically arranged on the installation baffle 4 and the first partition 111. A movable net 41 is vertically slidably installed between the symmetrically arranged magnetic blocks 413. There is a magnetic repulsion between the magnetic blocks 413 and the frame 411 of the movable net 41. The lower end of the mounting baffle 4 does not contact the bottom of the flocculation zone 11. The wastewater in the flocculation zone 11 flows from bottom to top through the movable net 41 and reaches the communication port 19 on the first partition 111. There is a height difference between the liquid surfaces on both sides of the mounting baffle 4. During operation, wastewater and domestic sewage are mixed at the inlet 15 and sent to the flocculation zone 11, where impurities and large particles in the wastewater are settled. After that, the relatively purified wastewater enters the anaerobic zone 12 and the aerobic zone 13 in sequence, where microorganisms in the activated sludge degrade the wastewater. Then, the wastewater enters the sedimentation zone 14, where the sludge and impurities that still exist in the wastewater are settled by gravity, so that the water discharged from the outlet 16 has a good treatment effect and is easy to recycle and reuse. Meanwhile, after the wastewater enters the anaerobic zone 12 and the aerobic zone 13, the activated sludge in the anaerobic zone 12 and the aerobic zone 13 is stirred by the aeration mechanism, which promotes full contact between the wastewater and the activated sludge, improves the treatment effect of the wastewater, and facilitates the recycling of the wastewater. Meanwhile, after the wastewater enters the flocculation zone 11, the flocculant added will flocculate and settle the particulate impurities in the wastewater, so that large particulate impurities or other flocculents will gradually settle onto the sludge discharge plate 2 at the bottom of the flocculation zone 11. After that, as the material lifting equipment operates normally, the accumulated sediment and sludge on the sludge discharge plate 2 at the bottom of the flocculation zone 11, i.e., the sludge, will gradually increase. Then, the staff will open the first sludge outlet 17 to allow the sludge to move along the inclined sludge discharge plate 2 to the first sludge outlet 17 and be discharged. Meanwhile, when the sludge adheres to the sludge discharge plate 2 and is difficult to separate or detach, the staff turns on the external air source and fills the cavity inside the sludge discharge plate 2 with gas through the air intake control pipe 22, causing the sludge discharge plate 2 to expand. In order to use the expansion and contraction of the sludge discharge plate 2 to promote the movement of the sludge towards the first sludge outlet 17, and discharge the sludge accumulated in the flocculation zone 11, so as to ensure the normal operation of the material lifting equipment. Similarly, the sludge settled in the sedimentation zone 14 is discharged from the second sludge outlet 18 in the same way. At the same time, the clear water in the upper part of the sedimentation zone is discharged from the liquid outlet 16. Meanwhile, after the wastewater enters the flocculation zone 11 from the inlet 15, it passes through the movable net 41 from bottom to top, and then enters the anaerobic zone 12 from the connecting port 19 on the first partition 111. During this process, the movable net 41 isolates and filters the wastewater in the flocculation zone 11. Together with the intercepting net 7 in the connecting hole on the first partition 111, it prevents large particles or other flocculent matter in the wastewater from entering the subsequent treatment process and affecting the normal use of the lifting equipment. At the same time, since the second partition 121 and the third partition 131 are both provided with connecting ports 19 and the intercepting nets 7 are installed in the connecting ports 19, the flow of wastewater between different treatment stages in the lifting equipment will be filtered and intercepted multiple times, so as to avoid excessive impurities and large particles in the water discharged from the outlet 16 of the lifting equipment, and ensure the wastewater recycling and treatment effect. Meanwhile, since the movable net 41 is installed between the two magnetic blocks 413, and there is a magnetic repulsion between the magnetic blocks 413 and the frame 411 of the movable net 41, the movable net 41 will be in a relatively suspended state in the flocculation zone 11. This will cause the movable net 41 to be impacted and washed by the wastewater flowing in the flocculation zone 11, causing the movable net 41 to slide up and down between the magnetic blocks 413. This will promote the wastewater to pass through the movable net 41 from bottom to top and reduce the accumulation of impurities and sludge on the movable net 41, which could cause blockage.

[0020] In one embodiment of the present invention, a guide plate 42 is installed in the flocculation zone 11. The guide plate 42 is located below the mounting baffle 4, and there is a gap between the guide plate 42 and the mounting baffle 4. The cross-section of the guide plate 42 is an inverted L shape. Part of the wastewater fed into the inlet 15 impacts the horizontal part of the guide plate 42, and another part of the wastewater fed into the inlet 15 impacts the vertical part of the guide plate 42. The amount of wastewater impacting the horizontal part of the guide plate 42 is less than the amount of wastewater impacting the vertical part. The wastewater fed in by the inlet 15 flows towards the movable net 41 after impacting the horizontal part of the guide plate 42. Because the movable net 41 is located within the space enclosed by the baffle 4 and the first partition 111, it is relatively isolated from the wastewater in other areas of the flocculation zone 11. This means the impact and agitation of the wastewater flow on the movable net 41 is relatively weak, making it difficult to impact and clean the net. Therefore, by installing the guide plate 42, a portion of the wastewater discharged from the inlet 15 impacts the horizontal portion of the guide plate 42, causing this portion of the wastewater to change its flow direction and ultimately impact the area below the movable net 41, thus clearing the wastewater within the space enclosed by the baffle 4. The water fluctuates significantly, causing the moving net 41 to move up and down. This promotes the wastewater to flow from bottom to top through the moving net 41 and reduces the amount of sludge adhering to the moving net 41. At the same time, due to the azimuth angle between the inlet 15 and the guide plate 42, most of the wastewater discharged from the inlet 15 impacts the vertical part of the guide plate 42. This portion of wastewater will flow back and forth and agitate within the flocculation zone 11, thereby promoting thorough mixing of the wastewater and the added flocculant within the flocculation zone 11 and improving the flocculation effect of the flocculant on impurities and large particles in the wastewater. Meanwhile, since most of the wastewater discharged from the inlet 15 will impact the vertical part of the guide plate 42, the amount of wastewater that directly enters the space enclosed by the baffle 4 can be reduced. This may prevent the wastewater from contacting and impacting the movable net 41 when the impurities and large particles in the wastewater are not fully flocculated, causing some impurities in the wastewater to pass through the movable net 41 and the intercepting net 7 and enter the subsequent treatment stage, affecting the normal operation of the material lifting equipment.

[0021] In one embodiment of the present invention, the movable net 41 includes a net frame 411 and a filter 412. The area of ​​the filter 412 after being unfolded and flattened on a horizontal plane is larger than the area of ​​the net frame 411. The filter 412 is provided with multiple layers, and there are gaps between the filter 412. Since the area of ​​the filter screen 412 is larger than that of the frame 411, when the movable screen 41 slides up and down, the filter screen 412 will bulge relative to the frame 411. As the direction of movement of the movable screen 41 changes, the direction of the bulge of the filter screen 412 also changes. During this process, in conjunction with the gaps between the filter screens 412, the relative collision and impact between the layers of filter screens 412 will reduce the possibility of sludge adhering to the filter screen 412 and clogging the filter screen 412. At the same time, when the direction of the bulge of the filter screen 412 changes, the possibility of sludge and flocs adhering to the filter screen 412 will be further reduced, and the interception effect of impurities and large flocs in wastewater will be ensured.

[0022] In one embodiment of the present invention, a collection plate 21 is provided on the surface of the mud discharge plate 2, the collection plate 21 is evenly distributed on the mud discharge plate 2, and the gaps between the collection plates 21 form a collection groove. There is a blank area between the collecting trough and the edge of the mud discharge plate 2 near the mud outlet; The collection plate 21 forms a collection trough on the sludge discharge plate 2, allowing the sludge that settles in the flocculation zone 11 and sedimentation zone 14 to enter the collection trough. The collection trough stabilizes and protects the sludge, reducing the impact and agitation of the sludge on the sludge on the sludge discharge plate 2 caused by the continuous flow of water in the flocculation zone 11 and sedimentation zone 14. This prevents the sludge that has settled on the surface of the sludge discharge plate 2 from being easily stirred up again by the flowing water, thereby improving the sludge settling effect. Meanwhile, the sludge entering the collection tank will gradually slide along the inclined surface of the sludge discharge plate 2 and move towards the sludge outlet so that the sludge on the sludge discharge plate 2 can be discharged. At the same time, when the cavity inside the sludge discharge plate 2 is filled with gas and expands, the inclination of the collection tank increases. Combined with the expansion and contraction of the sludge discharge plate 2, it will promote the discharge of the sludge towards the sludge outlet, and prevent the sludge from getting stuck or sticking in the collection tank, which would affect the discharge of the sludge and the normal operation of the material lifting equipment.

[0023] In one embodiment of the present invention, the collecting plate 21 includes an elastic sheet 211 and a shaping strip 212. The shaping strip 212 is installed on the upper and lower sides of the elastic sheet 211, and the shaping strip 212 below the elastic sheet 211 is installed on the surface of the mud discharge plate 2. The shaping strip 212 has evenly distributed slits, and the shaping strip 212 is divided into multiple independent units by the slits; As the sludge is discharged, gas is injected into the cavity inside the sludge discharge plate 2 and it expands. By using an elastic sheet 211 that is elastic and easily deformable and a cut-out sturdy strip, the collecting plate 21 can deform along with the expansion and deformation of the sludge discharge plate 2, so as to avoid interference between the collecting plate 21 and the expanding sludge discharge plate 2, and to ensure that the sludge in the collecting tank is discharged smoothly from the sludge outlet.

[0024] In one embodiment of the present invention, activated sludge is placed in the anaerobic zone 12 and the aerobic zone 13, and an isolation net 5 is installed in the anaerobic zone 12 and the aerobic zone 13. There is a gap between the bottom surface of the anaerobic zone 12 and the aerobic zone 13 and the isolation net 5. The activated sludge is placed above the isolation net 5. The aeration mechanism stirs the activated sludge above the isolation net 5. Drainage pipes 3 are installed on the first isolation plate and the second partition plate 121. The drainage pipes 3 guide the wastewater discharged from the connection port 19 to the space below the isolation net 5 and then discharge it. Drainage pipes 3 are installed on the third partition plate 131. The drainage pipes 3 on the third partition plate 131 guide the wastewater discharged from the connection port 19 to the bottom of the sedimentation zone 14 and discharge it. The isolation net 5 has a double-layer structure, and the space between the two layers of the isolation net 5 is filled with barrier sand 51. The barrier sand 51 is a common granular filter material, such as one or more of quartz sand, gravel, anthracite, and manganese sand. Both the anaerobic zone 12 and the aerobic zone are equipped with flow plates 6. One end of the flow plate 6 in the anaerobic zone 12 is installed on the side wall near the liquid outlet 16. There is a gap between the other end of the flow plate 6 in the anaerobic zone 12 and the side wall near the liquid inlet 15. The end of the flow plate 6 in the anaerobic zone 12 near the liquid inlet 15 is lower than the end of the flow plate 6 near the liquid outlet 16. By installing isolation nets 5 in the anaerobic zone 12 and aerobic zone 13, and by allowing wastewater to enter the anaerobic zone 12 and aerobic zone 13 from below the isolation nets 5 through the diversion pipes 3, the wastewater will pass through the isolation nets 5 and flow upwards. It will then enter the subsequent treatment stage through the connecting ports 19 on the second partition 121 and the third partition 131. During this process, the wastewater flowing upwards will impact and agitate the activated sludge in the anaerobic zone 12 and aerobic zone 13, further suspending the activated sludge in the anaerobic zone 12 and aerobic zone 13. This promotes thorough mixing and contact between the activated sludge and the wastewater, improves the uniformity of the activated sludge distribution, and, in conjunction with the aeration mechanism, agitates the activated sludge, increasing its fluidity in the anaerobic zone 12 and aerobic zone 13. This improves the treatment effect and reaction efficiency of the activated sludge on the wastewater. Meanwhile, because the activated sludge is agitated and suspended by the wastewater flowing upwards, it is easy for the activated sludge to come into contact with the interceptor net 7 at the connection port 19 or pass through the connection port 19 into the subsequent treatment stage, resulting in the loss of activated sludge or a reduction in the treatment effect of activated sludge. Therefore, a flow plate 6 is installed in the anaerobic zone 12 and the aerobic zone 13 to intercept and block the suspended activated sludge flowing upwards in the anaerobic zone 12 and the aerobic zone 13. At the same time, the flow plate 6 intercepts, stabilizes and smooths the upward flow of water, avoiding large fluctuations in the wastewater in the anaerobic zone 12 and the aerobic zone 13, and making the water flow reaching the connection port 19 relatively stable and close to the laminar flow state, reducing the loss of activated sludge or the attachment and blockage of the interceptor net 7 at the connection port 19 by activated sludge. Meanwhile, because the flow plate 6 is installed at an angle, after the water flow is stabilized and smoothed by the flow plate 6, some activated sludge will still be carried and transported to the top of the flow plate 6. Then, due to the stabilizing effect of the flow plate 6 on the water flow, the carried activated sludge settles on the upper surface of the flow plate 6. The settled activated sludge then gradually slides down the surface of the flow plate 6 and falls back to the bottom of the flow plate 6, ensuring the treatment effect of the activated sludge and preventing the loss of activated sludge. Meanwhile, the space between the two layers of isolation net 5 is filled with blocking sand 51 to improve the interception and blocking effect of the isolation net 5 on the activated sludge, and to prevent the activated sludge from settling and passing through the isolation net 5 after being stirred, which would lead to the loss of activated sludge and affect the normal operation of the feeding equipment.

[0025] In one embodiment of the present invention, an elastic rod 61 is installed above the flow plate 6. One end of the elastic rod 61 is installed on the side wall of the anaerobic zone 12 near the liquid outlet 16, and an impact ball 611 is installed on the other end of the elastic rod 61. The impact ball 611 is located in the gap between the flow plate 6 and the side wall near the liquid inlet 15 in the anaerobic zone 12. The elastic rod 61 is in contact with the upper surface of the flow plate 6. The intercepting net 7 is installed on the connecting port 19 at one end near the liquid inlet 15. The intercepting net 7 is installed at an angle at the connecting port 19. The lower end of the intercepting net 7 is flush with the end of the connecting port 19 near the liquid inlet 15. The distance between the upper end of the intercepting net 7 and the liquid inlet 15 is less than the distance between the lower end of the intercepting net 7 and the liquid inlet 15. As the water flows upward in the anaerobic zone 12 and the aerobic zone 13, it passes through the gap between the horizontal plate 6 and the side wall. During this process, the water impacts the impact ball 611 in the gap, which in turn causes the elastic rod 61 to vibrate or swing. The swinging and undulating motion of the elastic rod 61 moves the activated sludge that has settled and fallen onto the surface of the horizontal plate 6, promoting the activated sludge to gradually slide off the horizontal plate 6 and fall back down from the gap to below the horizontal plate 6. This prevents the activated sludge from being lost or adhering to the interception net 7, which could cause the interception net 7 to become clogged.

[0026] In one embodiment of the present invention, a baffle plate 52 is installed in the anaerobic zone 12 and the aerobic zone. An installation rod 521 is installed on the baffle plate 52. The upper end of the baffle plate 52 does not contact the flow plate 6, and the lower end of the baffle plate 52 does not contact the isolation net 5. The baffle plate 52 is composed of flat-shaped airbags. The mounting rod 521 has a cavity inside. An air inlet pipe 53 is installed on the mounting rod 521. The air inlet pipe 53 is connected to the airbag through the cavity. The surface of the airbag has micropores. The micropores on the airbag aerate the activated sludge in the anaerobic zone 12 and the aerobic zone 13. A cover plate 132 is installed above the aerobic zone 13. The cover plate 132 isolates the aerobic zone 13 from the outside world to form a relatively closed space. A connecting pipe 54 is installed on the cover plate 132. The other end of the connecting pipe 54 is connected to the air inlet pipe 53 in the anaerobic zone 12. Baffles 52 are installed in the anaerobic zone 12 and the aerobic zone 13 to relatively separate the activated sludge in the anaerobic zone 12 and the aerobic zone 13, reduce the horizontal movement of activated sludge in the anaerobic zone 12 and the aerobic zone 13, and prevent the activated sludge from moving laterally when it is agitated by aeration and upward water flow, so as to prevent the local area of ​​activated sludge in the anaerobic zone 12 and the aerobic zone 13 from accumulating and affecting the normal function of activated sludge. Meanwhile, by using flat-shaped airbags to form baffles 52 and opening micropores on the surface of the airbags, the baffles 52 can relatively isolate the activated sludge in the anaerobic zone 12 and the aerobic zone 13, and also aerate and agitate the isolated activated sludge, further improving the agitation effect of the activated sludge, ensuring that the activated sludge is evenly distributed and has good fluidity, so that the activated sludge and wastewater can fully contact each other and improve the wastewater treatment effect. Meanwhile, the aerobic zone 13 is sealed by the cover plate 132, so that the gas after aeration in the aerobic zone 13 is collected. Then, the gas collected in the aerobic zone 13 is used to aerate and agitate the anaerobic zone 12, thereby improving the utilization rate of the aeration gas and preventing excessive oxygen from entering the anaerobic zone 12 during the aeration process, which would affect the normal operation of the anaerobic zone 12. In addition, in practical applications, an air pump can be installed on the connecting pipe 54 connecting the aerobic zone 13 and the anaerobic zone 12 to ensure that the gas collected in the aerobic zone 13 can smoothly enter the anaerobic zone 12 for aeration.

[0027] The specific workflow is as follows: During operation, wastewater is fed into flocculation zone 11 from inlet 15. After being relatively purified, the wastewater enters anaerobic zone 12 and aerobic zone 13 in sequence. Then, the wastewater enters sedimentation zone 14 for gravity settling and is finally discharged from outlet 16. Meanwhile, after the wastewater enters the anaerobic zone 12 and the aerobic zone 13, the activated sludge in the anaerobic zone 12 and the aerobic zone 13 is stirred by the aeration mechanism. Meanwhile, after the wastewater enters the flocculation zone 11, the flocculant added will flocculate and settle the particulate impurities in the wastewater, so that large particulate impurities or other flocculents will gradually settle onto the sludge discharge plate 2 at the bottom of the flocculation zone 11. After that, as the material lifting equipment operates normally, the accumulated sediment and sludge on the sludge discharge plate 2 at the bottom of the flocculation zone 11, i.e., the sludge, will gradually increase. Then, the staff will open the first sludge outlet 17 to allow the sludge to move along the inclined sludge discharge plate 2 to the first sludge outlet 17 and be discharged. Meanwhile, when the sludge adheres to the sludge discharge plate 2 and is difficult to separate or detach, the staff turns on the external air source and fills the cavity inside the sludge discharge plate 2 with gas through the air intake control pipe 22, causing the sludge discharge plate 2 to expand. In order to use the expansion and contraction of the sludge discharge plate 2 to promote the movement and discharge of the sludge towards the first sludge outlet 17. Similarly, the sludge settled in the sedimentation zone 14 is discharged from the second sludge outlet 18 in the same way. At the same time, the clear water in the upper part of the sedimentation zone is discharged from the liquid outlet 16. Meanwhile, after the wastewater enters the flocculation zone 11 from the inlet 15, it passes through the movable net 41 from bottom to top, and then enters the anaerobic zone 12 from the connecting port 19 on the first partition 111. During this process, the movable net 41 isolates and filters the wastewater in the flocculation zone 11. Together with the intercepting net 7 in the connecting hole on the first partition 111, it prevents large particles or other flocculent matter in the wastewater from entering the subsequent treatment process. At the same time, since the second partition 121 and the third partition 131 are both provided with connecting ports 19 and the intercepting nets 7 are installed in the connecting ports 19, the flow of wastewater between different treatment stages in the feeding equipment will be filtered and intercepted multiple times. Meanwhile, since the movable net 41 is installed between two magnetic blocks 413, and there is a magnetic repulsion between the magnetic blocks 413 and the frame 411 of the movable net 41, the movable net 41 will be in a relatively suspended state in the flocculation zone 11, which will cause the movable net 41 to be impacted and washed by the wastewater flowing in the flocculation zone 11, causing the movable net 41 to slide up and down between the magnetic blocks 413. By installing the guide plate 42, a portion of the wastewater discharged from the inlet 15 impacts the horizontal part of the guide plate 42, causing this portion of wastewater to change its flow direction and eventually impact the lower part of the movable net 41. This causes relatively large fluctuations in the wastewater within the space enclosed by the baffle 4, which in turn causes the movable net 41 to move up and down due to the impact. At the same time, due to the azimuth angle between the inlet 15 and the guide plate 42, most of the wastewater discharged from the inlet 15 impacts the vertical part of the guide plate 42. This portion of wastewater will flow back and forth and agitate the wastewater within the flocculation zone 11. Since the area of ​​the filter screen 412 is larger than the area of ​​the mesh frame 411, when the movable mesh 41 slides up and down, the filter screen 412 will bulge relative to the mesh frame 411. As the direction of movement of the movable mesh 41 changes, the direction of the bulge of the filter screen 412 also changes. In this process, together with the gaps between the filter screens 412, the relative collision and impact between the filter screens 412 will reduce the possibility of sludge adhering to the filter screen 412 and clogging the filter screen 412. The collection plate 21 forms a collection trough on the mud discharge plate 2, allowing the sediment that settles in the flocculation zone 11 and sedimentation zone 14 to enter the collection trough. The collection trough is used to stabilize and protect the sediment, reducing the impact and agitation of the sediment on the mud discharge plate 2 caused by the continuous flow of water in the flocculation zone 11 and sedimentation zone 14. Meanwhile, the sludge that enters the collection tank will gradually slide along the inclined surface of the sludge discharge plate 2 and move towards the sludge outlet and be discharged. At the same time, when the cavity inside the sludge discharge plate 2 is filled with gas and expands, the inclination of the collection tank increases. Combined with the expansion and contraction of the sludge discharge plate 2, it promotes the discharge of the sludge towards the sludge outlet. As the sludge is discharged, gas is injected into the cavity inside the sludge discharge plate 2 and it expands. By using the elastic sheet 211 that is elastic and easily deformable and the separated sturdy strips, the collecting plate 21 can deform along with the expansion and deformation of the sludge discharge plate 2. The wastewater flowing from bottom to top impacts and agitates the activated sludge in the anaerobic zone 12 and aerobic zone 13, keeping the activated sludge in a suspended state and improving the uniformity of activated sludge distribution. At the same time, the aeration mechanism agitates the activated sludge, improving its fluidity. In the anaerobic zone 12 and the aerobic zone 13, the flow plate 6 is installed to intercept and block the suspended activated sludge flowing from bottom to top in the anaerobic zone 12 and the aerobic zone 13, as well as to intercept, stabilize and slow down the water flow, so that the water flow reaching the connecting port 19 is relatively stable. Meanwhile, because the horizontal flow plate 6 is installed at an angle, after the water flow is stabilized and smoothed by the horizontal flow plate 6, some activated sludge will still be carried and transported to the top of the horizontal flow plate 6. Then, due to the stabilizing effect of the horizontal flow plate 6 on the water flow, the carried activated sludge settles on the upper surface of the horizontal flow plate 6 and then gradually slides down along the surface of the horizontal flow plate 6 and falls back to the bottom of the horizontal flow plate 6. Meanwhile, the space between the two layers of isolation net 5 is filled with blocking sand 51 to improve the interception and blocking effect of the isolation net 5 on the activated sludge, and to prevent the activated sludge from settling and passing through the isolation net 5 after being stirred. The water flow impacts the impact ball 611 in the gap, which in turn causes the elastic rod 61 to vibrate or swing. The swinging and undulating of the elastic rod 61 moves the activated sludge that has settled and fallen onto the surface of the flow plate 6, promoting the activated sludge on the flow plate 6 to gradually slide down and fall back down from the gap to below the flow plate 6. Baffles 52 are installed in the anaerobic zone 12 and the aerobic zone 13 to relatively separate the activated sludge in the anaerobic zone 12 and the aerobic zone 13, thereby reducing the horizontal movement of activated sludge in the anaerobic zone 12 and the aerobic zone 13. Meanwhile, by using flat-shaped airbags to form baffles 52 and opening micropores on the surface of the airbags, the baffles 52 can relatively isolate the activated sludge in the anaerobic zone 12 and the aerobic zone 13, and also aerate and agitate the isolated activated sludge to ensure that the activated sludge is evenly distributed and has good fluidity. Meanwhile, the aerobic zone 13 is sealed by the cover plate 132, so that the gas after aeration in the aerobic zone 13 is collected. Then, the gas collected in the aerobic zone 13 is used to aerate and stir the anaerobic zone 12, and to prevent too much oxygen from being introduced into the anaerobic zone 12 during the aeration process.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater extraction device for the production of dioctyl terephthalate, comprising a main body (1), wherein a first partition (111), a second partition (121) and a third partition (131) are installed in the main body (1) from right to left, and the main body (1) is divided into a flocculation zone (11), an anaerobic zone (12), an aerobic zone (13) and a sedimentation zone (14) from right to left, wherein the flocculation zone (11) is provided with an inlet (15) and a first sludge outlet (17) from top to bottom, and the sedimentation zone (14) is provided with an outlet (16) and a second sludge outlet (18) from top to bottom, wherein a connecting port (19) is provided at the upper end of the first partition (111), the second partition (121) and the third partition (131), and an intercepting net (7) is installed at the connecting port (19); Aeration mechanisms are provided in the anaerobic zone (12) and the aerobic zone (13); Its features are: A mud discharge plate (2) is installed on the bottom surface of the flocculation zone (11) and the sedimentation zone (14). The end of the mud discharge plate (2) near the mud outlet is lower than the other end of the mud discharge plate (2). The mud discharge plate (2) is made of rubber material. A cavity is opened inside the mud discharge plate (2). An air intake control pipe (22) is connected to the cavity inside the mud discharge plate (2). An installation baffle (4) is installed in the flocculation zone (11). Magnetic blocks (413) are symmetrically arranged on the installation baffle (4) and the first partition (111). A movable net (41) is vertically slidably installed between the symmetrically arranged magnetic blocks (413). There is a magnetic repulsion between the magnetic blocks (413) and the frame (411) of the movable net (41). The lower end of the mounting baffle (4) does not contact the bottom of the flocculation zone (11). The wastewater in the flocculation zone (11) passes through the movable net (41) from bottom to top and reaches the communication port (19) on the first partition (111). There is a height difference between the liquid surfaces on both sides of the mounting baffle (4).

2. The wastewater extraction equipment for the production of dioctyl terephthalate according to claim 1, characterized in that: A guide plate (42) is installed in the flocculation zone (11). The guide plate (42) is located below the mounting baffle (4). There is a gap between the guide plate (42) and the mounting baffle (4). The cross section of the guide plate (42) is an inverted L shape. Part of the wastewater fed into the inlet (15) impacts the horizontal part of the guide plate (42), and the other part of the wastewater fed into the inlet (15) impacts the vertical part of the guide plate (42). The amount of wastewater impacting the horizontal part of the guide plate (42) is less than the amount of wastewater impacting the vertical part. The wastewater fed in by the inlet (15) flows towards the movable net (41) after impacting the horizontal part of the guide plate (42).

3. The wastewater extraction equipment for the production of dioctyl terephthalate according to claim 2, characterized in that: The movable net (41) includes a frame (411) and a filter (412). The area of ​​the filter (412) after being unfolded and flattened on a horizontal plane is larger than the area of ​​the frame (411). The filter (412) is provided with multiple layers, and there are gaps between the filter (412).

4. The wastewater extraction equipment for the production of dioctyl terephthalate according to claim 1, characterized in that: A collection plate (21) is provided on the surface of the mud discharge plate (2). The collection plates (21) are evenly distributed on the mud discharge plate (2), and the gaps between the collection plates (21) form a collection groove. There is a blank area between the collecting trough and the edge of the mud discharge plate (2) near the mud outlet.

5. The wastewater extraction equipment for the production of dioctyl terephthalate according to claim 4, characterized in that: The collecting plate (21) includes an elastic sheet (211) and a shaping strip (212). The shaping strip (212) is installed on the upper and lower sides of the elastic sheet (211), and the shaping strip (212) below the elastic sheet (211) is installed on the surface of the mud discharge plate (2). The shaping strip (212) has evenly distributed slits, and the shaping strip (212) is divided into multiple independent units by the slits.

6. The wastewater extraction equipment for the production of dioctyl terephthalate according to claim 1, characterized in that: Activated sludge is placed in the anaerobic zone (12) and aerobic zone (13). Isolation nets (5) are installed in the anaerobic zone (12) and aerobic zone (13). There is a gap between the bottom surface of the anaerobic zone (12) and aerobic zone (13) and the isolation nets (5). The activated sludge is placed above the isolation nets (5). The aeration mechanism stirs the activated sludge above the isolation nets (5). Drainage pipes (3) are installed on the first isolation plate and the second partition plate (121). The drainage pipes (3) guide the wastewater discharged from the connection port (19) to the space below the isolation nets (5) and then discharge it. Drainage pipes (3) are installed on the third partition plate (131). The drainage pipes (3) on the third partition plate (131) guide the wastewater discharged from the connection port (19) to the bottom of the sedimentation zone (14) and discharge it. The isolation net (5) has a double-layer structure, and the space between the two layers of the isolation net (5) is filled with barrier sand (51). The barrier sand (51) is a common granular filter material, such as one or more of quartz sand, gravel, anthracite, and manganese sand. Both the anaerobic zone (12) and the aerobic zone are equipped with a flow plate (6). One end of the flow plate (6) in the anaerobic zone (12) is installed on the side wall near the liquid outlet (16). There is a gap between the other end of the flow plate (6) in the anaerobic zone (12) and the side wall near the liquid inlet (15). The end of the flow plate (6) in the anaerobic zone (12) near the liquid inlet (15) is lower than the end of the flow plate (6) near the liquid outlet (16).

7. The wastewater extraction equipment for the production of dioctyl terephthalate according to claim 6, characterized in that: An elastic rod (61) is installed above the flow plate (6). One end of the elastic rod (61) is installed on the side wall of the anaerobic zone (12) near the liquid outlet (16). An impact ball (611) is installed on the other end of the elastic rod (61). The impact ball (611) is located in the gap between the flow plate (6) and the side wall near the liquid inlet (15) in the anaerobic zone (12). The elastic rod (61) is in contact with the upper surface of the flow plate (6). The intercepting net (7) is installed on the connecting port (19) at one end near the liquid inlet (15). The intercepting net (7) is installed at an angle at the connecting port (19). The lower end of the intercepting net (7) is flush with the end of the connecting port (19) near the liquid inlet (15). The distance between the upper end of the intercepting net (7) and the liquid inlet (15) is less than the distance between the lower end of the intercepting net (7) and the liquid inlet (15).

8. The wastewater extraction equipment for the production of dioctyl terephthalate according to claim 6, characterized in that: The anaerobic zone (12) and aerobic zone are equipped with baffles (52), and the baffles (52) are equipped with mounting rods (521). The upper end of the baffles (52) does not contact the flow plate (6), and the lower end of the baffles (52) does not contact the isolation net (5). The baffle (52) is composed of flat-shaped airbags. The mounting rod (521) has a cavity. An air inlet pipe (53) is installed on the mounting rod (521). The air inlet pipe (53) is connected to the airbag through the cavity. The surface of the airbag has micropores. The micropores on the airbag aerate the activated sludge in the anaerobic zone (12) and the aerobic zone (13). A cover plate (132) is installed above the aerobic zone (13). The cover plate (132) isolates the aerobic zone (13) from the outside world to form a relatively closed space. A connecting pipe (54) is installed on the cover plate (132). The other end of the connecting pipe (54) is connected to the air inlet pipe (53) in the anaerobic zone (12).

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