Air floatation type petroleum wastewater treatment device and treatment method thereof

Abstract

The application relates to the technical field of oil wastewater treatment equipment, and particularly discloses a gas float type oil wastewater treatment device and a treatment method thereof. The device comprises a gas float tank with a separation cavity, a driving mechanism and a slag removal mechanism. The driving mechanism is arranged on the tank body and comprises a transmission chain located above the separation cavity and capable of rotating in a first direction. The slag removal mechanism comprises a base plate arranged on the transmission chain and a slag pushing plate connected with the base plate and capable of moving towards or away from the base plate. The base plate is provided with two opposite side scrapers capable of stretching and retracting. The slag pushing plate is provided with a pushing block extending into the accommodating cavity and in transmission cooperation with the side scrapers. When the slag pushing plate is subjected to extrusion force, the side scrapers can be driven by the pushing block to stretch and retract in a second direction, so as to adaptively adjust the fitting pressure between the side scrapers and the inner side wall of the separation cavity. The device effectively avoids the escape of floating sludge and the excessive wear of components, adapts to the scraping requirements of floating sludge with different characteristics, and improves the gas float treatment efficiency and the water quality.

Description

Technical Field

[0001] This application relates to the technical field of petroleum wastewater treatment equipment, and in particular to an air flotation type petroleum wastewater treatment device and its treatment method. Background Technology

[0002] In the field of oil and gas wastewater treatment, dissolved air flotation (DAF) is currently the most widely used mainstream process. During operation, this process generates a large amount of scum on the surface of the fluid in the tank. This scum needs to be scraped off in a timely manner to ensure treatment efficiency and effluent quality. However, during the scum removal process, the scraper blades need to maintain contact and slide relative to the sidewalls of the DAF tank on both sides. Long-term sliding friction not only causes wear on the scraper blades and the tank wall but also creates tiny gaps between them, allowing some scum to escape through these gaps.

[0003] To address this issue, existing technologies typically involve adding flexible plates to both sides of the scraper. These plates utilize their elasticity to create a flexible fit against the pool wall, filling potential gaps to reduce scum escape and mitigating wear from sliding friction through flexible contact. However, the flexible plates themselves are relatively soft, and the characteristics of scum from oily wastewater vary significantly from batch to batch. Different batches of scum differ in viscosity, cohesion, and density, resulting in significant differences in the driving force required for scraping. Some batches of scum, due to their strong viscosity and dense structure, require greater driving force to be scraped off smoothly; while other batches are looser and require relatively less driving force. This causes the reaction force exerted by the scum on the flexible plate to fluctuate.

[0004] When the reaction force is large, the soft flexible board is prone to bending and deformation, which disrupts the original fit and creates large gaps, allowing a large amount of scum to escape through the gaps. If the adhesion between the flexible board and the pool wall is deliberately increased in order to improve the bending resistance of the flexible board, although it can suppress bending and deformation and reduce scum escape to a certain extent, the excessive adhesion will significantly increase the friction between the flexible board and the pool wall, accelerate the wear of the flexible board, and greatly shorten its service life. It is difficult to achieve both anti-escape and extended service life. Summary of the Invention

[0005] This application aims to propose an air flotation-type petroleum wastewater treatment device and its treatment method, so as to at least solve the technical problem in the prior art that when the air flotation treatment device for petroleum wastewater is scraping off scum, the flexible plates on both sides of the scraper fluctuate due to the reaction force of the scum, making it difficult to simultaneously prevent scum escape and extend the service life of the scraper itself.

[0006] In a first aspect, this application provides an air flotation type petroleum wastewater treatment device, comprising:

[0007] The flotation tank has a separation chamber;

[0008] A drive mechanism is provided on the pool body, and the drive mechanism has a transmission chain located above the separation chamber and capable of rotating in a first direction;

[0009] At least one slag removal mechanism includes a base plate disposed on the transmission chain and a slag pusher plate connected to the base plate and capable of moving toward or away from the base plate in the first direction.

[0010] The substrate has a receiving cavity extending in a second direction, and the opposite ends of the receiving cavity are respectively provided with side scrapers that can extend and retract in the second direction. The slag pusher is provided with a pusher block that extends into the receiving cavity and is in drive cooperation with the side scrapers.

[0011] When the slag pusher is subjected to a pressing force toward the substrate, the slag pusher can drive the side scraper to extend and retract in the second direction via the pusher block, so as to adaptively adjust the contact pressure between the side scraper and the inner wall of the separation chamber.

[0012] In some embodiments, the drive mechanism includes gear shafts spaced apart along the first direction on the flotation tank, and a drive member pulverizedly connected to at least one gear shaft;

[0013] Two of the transmission chains are arranged along the second direction, and each of the transmission chains is connected to two gear shafts respectively; at least one of the slag removal mechanisms is fixedly connected to the two transmission chains at both ends along the second direction.

[0014] In some embodiments, the substrate has connecting portions at both ends of its surface facing the slag pusher plate along the second direction, and hinged plates are rotatably connected to the connecting portions. The ends of the two hinged plates opposite to the connecting portions are movably connected to the opposite ends of the slag pusher plate.

[0015] When the slag pusher is subjected to a pressing force toward the substrate, the hinge plate can rotate around the connecting shaft with the connecting part, and the slag pusher moves toward the substrate between the two hinge plates, so that the slag gathers in the area between the two hinge plates.

[0016] In some embodiments, a pressure block that at least partially abuts against the push block is slidably connected within the receiving cavity; at least one guide rod extending to be slidably connected to the pressure block is provided at the end of the side scraper away from the side wall of the separation cavity, and an elastic element with its two ends respectively connected to the pressure block and the side scraper is sleeved on the guide rod.

[0017] In some embodiments, the slag removal mechanism further includes a support frame fixedly connected to the transmission chain and at least one telescopic member mounted on the support frame, the output end of the telescopic member being connected to the top surface of the substrate.

[0018] In some embodiments, a barrier film is provided on the substrate, and the barrier film covers the circumferential side of the slag pusher away from the substrate.

[0019] The slag pusher plate has multiple adsorption grooves with openings facing the barrier membrane arranged at intervals on the end face away from the substrate, and each adsorption groove is connected to a gas source delivery pipeline.

[0020] The gas supply pipeline can fill or extract gas into the adsorption tank to adjust the gas pressure in the adsorption tank, so that the barrier membrane deforms and disturbs in the area corresponding to the adsorption tank along the direction closer to or away from the slag pusher plate.

[0021] In some embodiments, a slag scraper is fixedly connected to the support frame, and the slag scraper is attached to the end face of the base opposite to the slag pusher plate.

[0022] The base is provided with a squeezing part extending toward the slag scraper. An elastic air storage bag is sandwiched between the squeezing part and the slag scraper. The elastic air storage bag is connected to the end of the air source delivery pipeline away from the adsorption tank. When the telescopic member drives the base to move, the slag scraper simultaneously scrapes off the floating slag attached to the surface of the base and simultaneously squeezes or releases the elastic air storage bag to adjust the air pressure in the adsorption tank.

[0023] In some embodiments, the flotation tank is provided with an inlet and an outlet communicating with the separation chamber at opposite ends along the first direction;

[0024] A baffle is provided in the separation chamber near the liquid inlet, and a shaped plate is provided in the area above the liquid outlet; the baffle and multiple side walls of the separation chamber enclose an aeration reaction area, and the shaped plate and multiple side walls of the separation chamber enclose a scum collection area.

[0025] In some embodiments, the partition plate has a first end portion at one end facing away from the bottom wall of the separation cavity, and the irregularly shaped plate has a second end portion at one end facing away from the bottom wall of the separation cavity;

[0026] Wherein, the distance between the first end and the bottom wall of the separation cavity in the third direction is less than the distance between the second end and the bottom wall of the separation cavity in the third direction.

[0027] The technical solutions provided in the first aspect of this application include at least the following beneficial effects or advantages:

[0028] The flotation-type petroleum wastewater treatment device provided in this application uses a drive chain to drive a slag removal mechanism to scrape off the scum on the upper layer of petroleum wastewater. The slag removal mechanism has a receiving cavity extending in a second direction within a base plate, and side scrapers that can extend and retract in the second direction are configured at both ends of the receiving cavity. These scrapers work in conjunction with a slag pusher plate slidably connected to the base plate. A pusher block extending into the receiving cavity is provided on one side of the pusher plate, forming a transmission engagement with the side scraper. This allows the pusher plate to adaptively adjust its contact pressure with the inner wall of the separation cavity when subjected to different extrusion forces. This effectively solves the problems of easy bending and slag leakage of the flexible plate or excessive wear due to excessive contact when the reaction force of the scum fluctuates. Furthermore, the contact pressure is adaptively adjusted based on the extrusion force of the scum on the pusher plate, ensuring that the side scraper always maintains optimal contact with the tank wall. This avoids scum escape caused by gaps and reduces unnecessary frictional losses. It also adapts to the differences in viscosity, density, and other characteristics of scum from different batches of petroleum wastewater, further improving the flotation treatment efficiency and effluent quality.

[0029] In a second aspect, embodiments of this application provide a method for treating petroleum wastewater using air flotation, the method being implemented based on an air flotation petroleum wastewater treatment device as described in any of the first aspects above, the method comprising:

[0030] The oil wastewater is fed into the separation chamber through the inlet of the flotation tank, allowing the wastewater to flow through the aeration reaction zone. The bubbles generated by the aeration adhere to the scum in the wastewater, causing the scum to float to the surface.

[0031] Start the drive mechanism to drive the transmission chain along the first direction, thereby driving the slag removal mechanism to move synchronously with the chain;

[0032] During the movement of the slag removal mechanism, the slag pusher plate comes into contact with the floating slag and is subjected to force, which drives the side scrapers at both ends of the base plate receiving cavity to extend and retract in the second direction, adaptively fitting the inner side wall of the separation cavity, and guiding the floating slag to gather through the hinge plate.

[0033] When the scum removal mechanism pushes the gathered scum toward the scum collection area, the height difference between the irregular plate and the baffle is used to guide the scum into the scum collection tank, and the clear water after the scum is removed by air flotation separation is discharged from the separation chamber through the liquid outlet.

[0034] After the slag removal mechanism disengages from the separation chamber along with the transmission chain, the telescopic component is activated to drive the scraper bar to move against the side wall of the substrate and squeeze or release the elastic air storage bladder. The air pressure in the adsorption tank of the slag pusher plate is adjusted through the air source delivery pipeline to cause deformation and disturbance of the barrier membrane, thereby removing the residual floating slag on the end face of the slag removal mechanism.

[0035] It should be noted that the beneficial effects that the technical solution provided in the second aspect of this application can achieve can be found in the relevant description of the first aspect above, and will not be repeated here.

[0036] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of the air flotation wastewater treatment device provided in the embodiments of this application;

[0039] Figure 2 This is a cross-sectional view of the air flotation wastewater treatment device provided according to the embodiments of this application;

[0040] Figure 3 This is another cross-sectional view of the air flotation wastewater treatment device provided according to the embodiments of this application;

[0041] Figure 4 This is a schematic diagram of the slag removal mechanism provided according to the embodiments of this application;

[0042] Figure 5 This is a first-view partial structural schematic diagram of the slag removal mechanism provided in the embodiments of this application;

[0043] Figure 6 This is a partial cross-sectional view of the slag removal mechanism provided according to an embodiment of this application;

[0044] Figure 7 This is a partial structural diagram of the slag removal mechanism provided in the embodiments of this application from a second perspective;

[0045] Figure 8 This is a flowchart of the device processing procedure provided according to the embodiments of this application.

[0046] Figure label:

[0047] 100. Processing device;

[0048] 10. Flotation tank; 11. Separation chamber; 111. Aeration reaction zone; 112. Scum collection zone; 12. Liquid inlet; 13. Liquid outlet; 14. Baffle; 141. First end; 15. Irregularly shaped plate; 151. Second end; 16. Support plate; 17. Aeration pipe; 18. Scum outlet;

[0049] 20. Drive mechanism; 21. Drive component; 22. Gear shaft; 221. Gear disc; 23. Transmission chain;

[0050] 30. Slag removal mechanism; 31. Support frame; 311. Slag hanging strip; 3111. Connecting rod; 32. Telescopic component; 33. Base plate; 331. Receiving cavity; 332. Connecting part; 333. Hinged plate; 3331. Rotating shaft; 334. Barrier membrane; 335. Extrusion part; 34. Slag pushing plate; 341. Pushing block; 342. Adsorption tank; 343. Gas source delivery pipeline; 35. Side scraper; 351. Guide rod; 352. Elastic component; 36. Pressing block; 37. Arc-shaped guide plate; 38. Elastic gas storage bag;

[0051] A. First direction; B. Second direction; C. Third direction. Detailed Implementation

[0052] The embodiments of this application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0053] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0055] Please see Figure 1 , Figure 2 , Figure 4 and Figure 6 This embodiment provides an air flotation-type petroleum wastewater treatment device. The device 100 may include an air flotation tank 10, a drive mechanism 20, and a sludge removal mechanism 30. The air flotation tank 10 can be rectangular. For ease of description, the length direction of the air flotation tank 10 is defined as the first direction A, the width direction as the second direction B, and the height direction as the first direction A. Specifically, as shown below... Figure 1As shown in the diagram; wherein, the flotation tank 10 has a separation chamber 11 with an opening at the top, a drive mechanism 20 is mounted on the tank body, and the drive mechanism 20 has a transmission chain 23 located above the separation chamber 11 and capable of rotating in a first direction A; the transmission chain 23 can be arranged in groups at intervals in a second direction B, and the slag removal mechanism 30 is arranged along the second direction B, and is connected and fixed to the surfaces opposite to the transmission chain 23 at both ends of the second direction B, so that the drive mechanism 20 can drive the slag removal mechanism 30 to move. At the same time, multiple slag removal mechanisms 30 can be provided. When multiple slag removal mechanisms 30 are provided, they can be arranged at intervals along the length direction of the transmission chain 23. When the transmission chain 23 is used, the multiple slag removal mechanisms 30 can continuously remove the slag in the separation chamber 11, thereby improving the slag treatment efficiency.

[0056] Furthermore, the slag removal mechanism 30 includes a base plate 33 mounted on the transmission chain 23, and a slag pusher 34 connected to the base plate 33 and capable of moving toward or away from the base plate 33 in a first direction A; wherein, the base plate 33 has a receiving cavity 331 extending along a second direction B, and the opposite ends of the receiving cavity 331 are respectively provided with side scrapers 35 capable of extending and retracting along the second direction B, wherein the receiving cavity 331 can be sealed on all sides, and both ends along the second direction B completely penetrate the two ends of the base plate 33, and the side scrapers 35 are provided with After being placed in the receiving cavity 331, the receiving cavity 331 can limit the periphery of the side scraper 35, so that it can only move in the second direction B. At the same time, the slag pusher 34 is provided with a pusher block 341 extending into the receiving cavity 331 and drivingly cooperating with the side scraper 35. When the slag pusher 34 is subjected to the pressing force toward the substrate 33, the slag pusher 34 can drive the side scraper 35 to extend and retract in the second direction B through the pusher block 341, so as to adaptively adjust the contact pressure between the side scraper 35 and the inner wall of the separation cavity 11.

[0057] It should be noted that the receiving cavity 331 can be a rectangular cavity, and the rotation direction of the transmission chain 23 in this embodiment can be counterclockwise, such as... Figure 2 As indicated by the arrow, the transmission chain 23 can drive the slag removal mechanism 30 to remove slag along the flow direction of the petroleum wastewater. At the same time, the width of the slag removal mechanism 30 along the second direction B can be slightly smaller than the width of the receiving cavity 331. When the transmission chain 23 drives the slag removal mechanism 30 to rotate and move within the receiving cavity 331, at least a portion of the slag removal mechanism 30 can be immersed in the petroleum wastewater to which the slag is to be removed. Preferably, the portion of the slag removal mechanism 30 along the third direction C that is less than half its height is immersed in the petroleum wastewater, thereby removing the slag from the surface of the wastewater.

[0058] It should also be noted that, regarding the transmission cooperation between the side scraper 35 and the pusher block 341, the pusher block 341 can be provided with an inclined surface, and the side scraper 35 near the end face of the pusher block 341 is provided with an inclined surface that cooperates with the inclined surface of the pusher block 341. Simultaneously, to achieve the telescopic function of the side scraper 35, an elastic structure can be provided to connect the side scraper 35 and the substrate 33 respectively. This elastic structure can be a spring or a structure made of rubber material. The inclined surface ensures that when the slag pusher 34 is subjected to a pressing force towards the substrate 33, causing the pusher block 341 to slide in the first direction A, it can apply a force along the second direction A to the side scraper 35. The side scraper 35 moves towards the inner wall of the receiving cavity 331 under the action of the extrusion force in direction B and abuts against the inner wall of the receiving cavity 331. The side scraper 35 and the slag pusher 34 form a linkage mechanism. When the extrusion force on the slag pusher 34 increases, the extrusion force on the side scraper 35 increases, and the fit with the inner wall of the receiving cavity 331 is higher. When the extrusion force on the slag pusher 34 decreases, it is reset by the elastic force of the elastic structure, so that the side scraper 35 can retract into the receiving cavity 331, thereby realizing adaptive adjustment of the fitting pressure between the side scraper 35 and the inner wall of the separation cavity 11.

[0059] The flotation-type petroleum wastewater treatment device 100 provided in this embodiment uses a drive chain 23 of the drive mechanism 20 to drive a slag removal mechanism 30 to scrape off the floating slag on the upper layer of the petroleum wastewater. The slag removal mechanism 30 has a receiving cavity 331 extending along the second direction B within a base plate 33. Side scrapers 35, which can extend and retract along the second direction B, are disposed at both ends of the receiving cavity 331. These scrapers cooperate with a slag pusher 34 slidably connected to the base plate 33. A pusher block 341 extending into the receiving cavity 331 is disposed on one side of the slag pusher 34, forming a transmission engagement with the side scraper 35, causing the slag pusher 34 to be subjected to different compressive forces. The side scraper 35 can adaptively adjust its contact pressure with the inner wall of the separation chamber 11, thereby effectively solving the problems of easy bending and slag leakage or excessive wear of the flexible plate when the reaction force of the slag fluctuates. In addition, the contact pressure is adaptively adjusted by the squeezing force of the slag on the push plate 34, so that the side scraper 35 always maintains the optimal contact state with the pool wall. This not only avoids the slag escape caused by gaps, but also reduces unnecessary friction loss. It can also adapt to the differences in viscosity, density and other characteristics of slag from different batches of petroleum wastewater, further improving the flotation treatment efficiency and effluent quality.

[0060] In some embodiments, continue reading Figure 1 and Figure 2The flotation tank 10 is provided with an inlet 12 and an outlet 13 at opposite ends along the first direction A, respectively, which are connected to the separation chamber 11. This ensures that the flow direction of the petroleum wastewater in the receiving chamber 331 is consistent with the transmission direction of the transmission chain 23 or the movement direction of the sludge removal mechanism 30, so that the sludge removal mechanism 30 can remove sludge along the water flow. The outer walls of the flotation tank 10 corresponding to the inlet 12 and outlet 13 can be provided with connecting flanges to facilitate external pipeline connections. A baffle 14 is provided in the separation chamber 11 near the inlet 12. The height of the baffle 14 is less than the height of the separation chamber 11, and the two ends of the baffle 14 along the second direction B respectively abut against the opposite side walls of the separation chamber 11 in the width direction. Thus, the baffle 14 and the multiple side walls of the separation chamber 11 enclose an aeration reaction zone 111. For the inlet 12... Located in the aeration reaction zone 111, a support plate 16 is provided on the flotation tank 10. The support plate 16 can be distributed along the second direction B. Multiple aeration pipes 17 can be connected and fixed on the support plate 16. The air outlet ends of the multiple aeration pipes 17 extend to the aeration reaction zone 111, that is, close to the liquid inlet 12 and the bottom wall area of ​​the separation chamber 11. At the same time, an irregular plate 15 is provided in the area above the liquid outlet 13. The two ends of the irregular plate 15 along the second direction B respectively abut against the opposite sidewalls of the separation chamber 11 in the width direction. Thus, the irregular plate 15 and the multiple sidewalls of the separation chamber 11 enclose a scum collection area 112. A scum outlet 18 is provided on the sidewall of the flotation tank 10 corresponding to the scum collection area 112. The scum outlet 18 is used to remove the scum in the scum collection area 112.

[0061] In this embodiment, when the petroleum wastewater enters the separation chamber 11 through the inlet 12, it flows directly into the aeration reaction zone 111 formed by the partition 14 and the side wall of the separation chamber 11. The aeration pipe 17 within the aeration reaction zone 111 continuously releases bubbles. The bubbles fully mix with the wastewater and adsorb the scum, causing the scum to float to the surface. The layout of the inlet 12 and outlet 13 ensures that the wastewater flow direction is consistent with the movement direction of the transmission chain 23 and the scum removal mechanism 30. The structure 30 can efficiently scrape away floating scum in the direction of water flow. At the same time, the irregular plate 15 and the side wall of the separation chamber 11 enclose a scum collection area 112. The scum collection area 112 can be a groove structure with an upward opening. The scum removal mechanism 30 pushes the scum into the scum collection area 112 enclosed by the irregular plate 15. The scum collection area 112 receives the scum pushed by the scum removal mechanism 30. The clear water after air flotation separation flows to the liquid outlet 13 at the bottom of the scum collection area and is discharged.

[0062] Thus, the design that aligns the wastewater flow direction with the scum scraping direction reduces the resistance of the water flow to the scum scraping process, improving the efficiency and thoroughness of scum scraping. The partitioning of the aeration reaction zone 111 and the scum collection zone 112 enables the orderly separation of wastewater flotation and centralized collection of scum, avoiding mutual interference. The layout of the aeration pipe 17 near the bottom wall of the separation chamber 11 allows bubbles to rise from the bottom, extending the contact time between the bubbles and the wastewater and improving the scum adsorption effect. The scum collection zone 112 can centrally collect the scraped scum for convenient subsequent treatment and prevent the scum from spreading and flowing back within the separation chamber 11. The connecting flanges on the outer walls of the inlet 12 and outlet 13 facilitate connection with external pipelines.

[0063] In some embodiments, please refer to Figure 3 The partition 14 has a first end 141 at one end facing away from the bottom wall of the separation cavity 11, and the irregular plate 15 has a second end 151 at one end facing away from the bottom wall of the separation cavity 11; wherein, the distance between the first end 141 and the bottom wall of the separation cavity 11 in the third direction C is less than the distance between the second end 151 and the bottom wall of the separation cavity 11 in the third direction C. Specifically, in conjunction with... Figure 3 As shown, a horizontal line a is drawn along the first direction A from the first end 141, and a horizontal line b is drawn along the first direction A from the second end 151. The shortest distance between the horizontal line b and the bottom wall of the separation chamber 11 is greater than the shortest distance between the horizontal line a and the bottom wall of the separation chamber 11 in the third direction C. It should also be noted that when the liquid level of the petroleum wastewater to be treated in the flotation tank 10 is between the horizontal line b and the horizontal line a, and the slag removal mechanism 30 is driven to the slag removal state by the transmission chain 23, the bottom end of the slag removal mechanism 30 is between the horizontal line b and the horizontal line a.

[0064] With this configuration, when the sludge removal mechanism 30 moves along the first direction A, it can smoothly push the scum that floats to the surface in the aeration reaction zone 111 to the scum collection zone 112 enclosed by the shaped plate 15. The structural barrier formed by the height difference can prevent the scum from flowing back. The height of the wastewater surface and the position of the bottom of the sludge removal mechanism 30 limit the sludge removal mechanism 30 to ensure that it can accurately act on the scum layer on the surface, avoiding the problem of scum leakage due to the position being too high or excessive resistance due to the position being too low. At the same time, the height advantage of the second end 151 is used to form a reliable scum-blocking boundary, ensuring that the scum is stably collected and pushed into the scum collection zone 112, improving the thoroughness of scum removal. Meanwhile, this height difference design does not affect the normal flow of wastewater in the separation chamber 11, further improving the efficiency of air flotation treatment and the final effluent quality.

[0065] In some embodiments, continue reading Figure 1 and Figure 2The drive mechanism 20 includes gear shafts 22 spaced apart along a first direction A on the flotation tank 10, and a drive member 21 that is connected to at least one gear shaft 22. Two transmission chains 23 are arranged along a second direction B, and each transmission chain 23 is connected to two gear shafts 22 respectively. At least one slag removal mechanism 30 is fixedly connected to the two transmission chains 23 at both ends along the second direction B. Specifically, the gear shafts 22 can be mounted on the flotation tank 10 through bearing seats. Each gear shaft 22 can be provided with gear disks 221 spaced apart along the second direction B. The gear disks 221 are meshed with the transmission chains 23. The drive member 21 can be a servo motor, thereby controlling the rotation of the transmission chains 23 through the drive member 21. The transmission chains 23 drive the multiple slag removal mechanisms 30 to rotate.

[0066] In some embodiments, see Figure 4 The slag removal mechanism 30 also includes a support frame 31 fixedly connected to the transmission chain 23 and at least one telescopic member 32 mounted on the support frame 31. The output end of the telescopic member 32 is connected to the top surface of the base plate 33. Specifically, the support frame 31 is arranged along the second direction B and its two ends are fixedly connected to the transmission chains 23 on both sides. The telescopic member 32 is mounted on the support frame 31 and its output shaft is arranged along the third direction C. Multiple telescopic members 32 can be provided. For example, two are provided at intervals in this embodiment. The telescopic member 32 can be a miniature cylinder. With this configuration, the telescopic member 32 can control the slag removal mechanism 30 to move toward or away from the transmission chain 23, thereby adjusting the contact area between the slag removal mechanism 30 and the oil wastewater to be treated, thereby improving the application scenarios of the device.

[0067] In some embodiments, please refer to Figure 5 The substrate 33 has connecting portions 332 at both ends along the second direction B on the surface of the substrate 33 facing the slag pusher plate 34. The two connecting portions 332 can be block structures. The connecting portions 332 are rotatably connected to hinge plates 333. The connecting portions 332 serve as rotational support points for the hinge plates 333. The ends of the two hinge plates 333 facing away from the connecting portions 332 are movably connected to the opposite ends of the slag pusher plate 34. When the slag pusher plate 34 is subjected to a squeezing force towards the substrate 33 during the process of scraping slag, the squeezing force is transmitted to the connecting end of the hinge plates 333 and the slag pusher plate 34, driving the two hinge plates 333 to rotate synchronously around the connecting shaft. At the same time, the slag pusher plate 34 moves towards the substrate 33 under the action of the squeezing force and is always between the two hinge plates 333. The two hinge plates 333 after rotation form an inward converging angle. This angle can guide the dispersed slag on both sides of the slag pusher plate 34 and guide the slag to gather in the area between the two hinge plates 333.

[0068] With this configuration, the hinge plate 333 and the slag pusher plate 34 work together in a coordinated manner. The slag pusher plate 34 is driven by the squeezing force of the slag on the slag pusher plate 34. When the slag pusher plate 34 is squeezed, it moves towards the base plate 33, so that the slag pusher plate 34 and the hinge plates 333 on both sides form a gathering groove concave towards the base plate 33. Automatic slag gathering can be achieved without additional power components. Furthermore, the inwardly rotating hinge plate 333 can effectively constrain the diffusion range of the slag, reduce the accumulation of slag on both sides of the slag pusher plate 34, thereby reducing the squeezing force on the side scraper plate 35 along the first direction A and improving the service life of the side scraper plate 35.

[0069] Optional, please continue reading Figure 5 Limiting holes are provided at both ends of the slag pusher plate 34. A rotating shaft 3331 extending into the limiting hole is provided at the end of the hinge plate 333 near the slag pusher plate 34. The limiting hole extends along the length of the slag pusher plate 34, and its extension length is greater than the radial dimension of the rotating shaft 3331. This allows the hinge plate 333 to rotate around the connecting shaft, and through the transmission cooperation between the rotating shaft 3331 and the limiting hole, drive the slag pusher plate 34 to move toward or away from the substrate 33 in the first direction A. Specifically, in this embodiment, since the slag pusher plate 34 needs to be able to move in the first direction A, the hinge plate 333 and the slag pusher plate 34 cannot simply be rotated. The setting of the limiting hole extending along the length of the slag pusher plate 34 allows the rotating shaft 3331 to move in the length direction of the limiting hole, thereby satisfying the requirement that the slag pusher plate 34 can move in the first direction A.

[0070] In some embodiments, please refer to Figure 5 and Figure 6The cavity 331 contains a pressure block 36 that is slidably connected to at least partially abutting against the push block 341. The side scraper 35, away from the end that is in contact with the side wall of the separation cavity 11, is provided with at least one guide rod 351 extending to be slidably connected to the pressure block 36. An elastic element 352, with its two ends respectively connected to the pressure block 36 and the side scraper 35, is sleeved on the guide rod 351. Specifically, the shape of the pressure block 36 is adapted to the shape of the cavity 331, meaning the pressure block 36 can only move along the second direction B in the direction of the cavity 331. An inclined surface is provided at the contact point between the pressure block 36 and the push block 341. This inclined surface allows the push block 341 to exert a force along the second direction B on the pressure block 36 when it moves in the second direction B. The pressure block 36 can be opened to connect with the guide rod 351. The hole that mates with rod 351 allows elastic element 352 to be a spring. At the same time, the two ends of the spring can be fixedly connected to pressure block 36 and side scraper 35 respectively. When pressure block 36 is subjected to extrusion pressure, it simultaneously extrudes elastic element 352. Elastic element 352 is limited by guide rod 351 and applies a force along the second direction B to side scraper 35, thereby causing side scraper 35 to move toward the side wall of receiving cavity 331. When slag pusher 34 pushes slag into slag collection area 112, and the extrusion pressure on slag pusher 34 decreases, at this time, under the elastic force of elastic element 352, pressure block 36 moves in the direction away from side scraper 35, thereby extruding pusher block 341, causing slag pusher 34 to move away from base plate 33 and reset.

[0071] In this embodiment, the extension and retraction transmission of the side scraper 35 is optimized through the cooperation of the pressure block 36, the guide rod 351, and the elastic element 352. The pressure block 36 and the push block 341 in the receiving cavity 331 partially abut against each other, forming a force transmission medium. The guide rod 351 is fixed at one end of the side scraper 35 away from the side wall of the separation cavity 11. The guide rod 351 is slidably connected to the pressure block 36, providing precise guidance for the extension and retraction of the side scraper 35. The elastic element 352 is sleeved on the guide rod 351, and its two ends are respectively connected to the pressure block 36 and the side scraper 35, forming an elastic buffer and reset structure. The three together constitute the side scraper. The telescopic structure of plate 35, during operation, involves the pusher plate 34 driving the pusher block 341 to press the pressure block 36. The pressure block 36 transmits the force to the side scraper plate 35 via the guide rod 351, driving the side scraper plate 35 to extend outward along the second direction B. At this time, the elastic element 352 is compressed and stores elastic potential energy. When the reaction force of the scum decreases, the pressing force of the pusher block 341 on the pressure block 36 weakens, the elastic element 352 releases its elastic potential energy, and the side scraper plate 35 retracts inward along the second direction B. Simultaneously, the pressure block 36 moves in a direction away from the side scraper plate 35, ensuring the linearity of the telescopic movement of the side scraper plate 35. The buffering effect of the elastic element 352 absorbs the fluctuating impact of the reaction force of the scum, making the adjustment of the contact pressure of the side scraper plate 35 more stable and reducing wear caused by excessive instantaneous pressure.

[0072] It should be noted that, since the slag removal mechanism 30 moves slowly during the slag removal process, after the slag removal mechanism 30 pushes the slag into the slag collection area 112, the side scraper 35 can ensure that the pressure block 36 is reset after the elastic force of the elastic element 352 is released, and the squeezing pressure between the side scraper 35 and the side wall of the receiving cavity 331 is eliminated. This allows the slag removal mechanism 30 to move back into the separation cavity 11 for slag removal. In other words, the reset function of the elastic element 352 enables the side scraper 35 to automatically return to its original position when there is no squeezing pressure.

[0073] In some embodiments, please refer to Figure 5 and Figure 7 A barrier film 334 is provided on the substrate 33, covering the circumferential side of the slag pusher plate 34 away from the substrate 33. The barrier film 334 completely wraps the hinge plate 333 and the slag pusher plate 34. The barrier film 334 can be made of flexible, oil-resistant, corrosion-resistant, and wear-resistant rubber material. The connecting part 332 can reserve a connection area on both sides of the substrate 33 in the second direction B. The barrier film 334 and the substrate 33 can be connected and fixed by bolt tightening or snap-fit ​​mechanism. Multiple [unclear] are arranged at intervals on the end face of the slag pusher plate 34 away from the substrate 33. The adsorption tank 342 with its opening facing the barrier membrane 334 is connected to a gas supply pipeline 343. Multiple adsorption tanks 342 are arranged at intervals along the length of the slag pusher plate 34. Each adsorption tank 342 is opened on the surface of the slag pusher plate 34 away from the substrate 33 and extends along the width of the slag pusher plate 34. Gas is injected into or extracted into the adsorption tank 342 through the gas supply pipeline 343 to adjust the gas pressure in the adsorption tank 342, so that the barrier membrane 334 deforms and disturbs in the area corresponding to the adsorption tank 342 in the direction of approaching or moving away from the slag pusher plate 34.

[0074] Specifically, when the gas supply pipeline 343 fills the adsorption tank 342 with gas, the gas pressure inside the adsorption tank 342 increases, pushing the barrier membrane 334 to bulge away from the slag pusher plate 34; when the gas supply pipeline 343 extracts gas from the adsorption tank 342, the gas pressure inside the adsorption tank 342 decreases, and the barrier membrane 334 contracts towards the slag pusher plate 34 under external pressure. Through this repeated filling and releasing of gas, the barrier membrane 334 is driven to continuously generate pressure in the corresponding area of ​​the adsorption tank 342. The deformation disturbance of the soft membrane 334 is prevented. At the same time, an arc-shaped guide plate 37 can be set on the top of the slag pusher plate 34. The arc-shaped guide plate 37 protrudes from the slag pusher plate 34 and prevents the deformation disturbance of the soft membrane 334 from destroying the adhesion between the slag and the surface of the slag pusher plate 34, thus preventing the slag from accumulating on the surface of the slag pusher plate 34. The interval arrangement of the adsorption tank 342 makes the disturbance of the soft membrane 334 more uniform, covering the entire front end of the slag pusher plate 34, and the anti-adhesion effect is more comprehensive, further improving the operational stability of the slag removal mechanism 30.

[0075] In some embodiments, please refer to Figure 4 and Figure 7 A scraper strip 311 is fixedly connected to the support frame 31. Specifically, the scraper strip 311 is fixedly connected to the support frame 31 via a connecting rod 3111. The scraper strip 311 is attached to the side end face of the base away from the slag pusher plate 34. The length direction of the scraper strip 311 is in the same direction as the second direction B. The base is provided with a pressing part 335 extending toward the scraper strip 311. An elastic air storage bag 38 is sandwiched between the pressing part 335 and the scraper strip 311. The elastic air storage bag 38 is connected to the end of the gas source delivery pipeline 343 away from the adsorption tank 342. When the telescopic member 32 drives the base to move, the scraper strip 311 simultaneously scrapes off the floating slag attached to the surface of the base and simultaneously presses or releases the elastic air storage bag 38 to adjust the gas pressure in the adsorption tank 342.

[0076] Specifically, this embodiment combines slag scraping and cleaning with air pressure regulation. The slag scraping strip 311 on the support frame 31 is attached to the side of the base away from the slag pushing plate 34, forming a cleaning structure on the base surface. The extrusion part 335 on the base extends above the slag scraping strip 311, and together with the slag scraping strip 311, clamps the elastic air storage bag 38. The elastic air storage bag 38 is connected to the end of the air source delivery pipeline 343 away from the adsorption tank 342, forming an air pressure auxiliary regulation circuit to realize the linkage between cleaning and air pressure regulation. During operation, the telescopic part 32 drives the base. As the base moves, on the one hand, the scraper strip 311 slides along the surface of the base, simultaneously scraping away the floating scum attached to the surface of the base; on the other hand, the extrusion part 335 on the base moves with the base, causing the elastic gas storage bag 38 to be extruded or released. When extruded, the gas in the elastic gas storage bag 38 is forced into the gas source delivery pipeline 343, increasing the gas pressure in the adsorption tank 342; when released, the elastic gas storage bag 38 rebounds, drawing in the gas in the gas source delivery pipeline 343, reducing the gas pressure in the adsorption tank 342, thereby helping to stabilize the gas pressure in the adsorption tank 342.

[0077] This configuration enables both cleaning and air pressure regulation functions through the drive of the telescopic component 32, simplifying the device structure and power requirements. No additional cleaning equipment or air pressure regulating pump is needed. The scraper bar 311 can promptly remove floating scum residue from the base surface, reducing the impact of scum accumulation on device operation. The auxiliary pressure regulation function of the elastic air storage bladder 38 makes the air pressure in the adsorption tank 342 more stable, ensuring the continuity of the barrier membrane 334 and further improving the anti-adhesion effect and device operation stability.

[0078] Please see Figure 8 This embodiment provides a method for treating petroleum wastewater using air flotation. The method is implemented based on the air flotation petroleum wastewater treatment device as described in any of the above embodiments, and includes:

[0079] Step S100: The petroleum wastewater is introduced into the separation chamber through the inlet of the flotation tank, so that the wastewater flows through the aeration reaction zone and the bubbles generated by aeration adhere to the scum in the wastewater, thereby causing the scum to float to the surface.

[0080] Step S200: Start the drive mechanism to drive the transmission chain along the first direction, thereby driving the slag removal mechanism to move synchronously with the chain;

[0081] Step S300: During the movement of the slag removal mechanism, the slag pusher plate comes into contact with the floating slag and is subjected to force, which drives the side scrapers at both ends of the base plate receiving cavity to extend and retract along the second direction, adaptively fitting the inner side wall of the separation cavity, and guiding the floating slag to gather through the hinge plate.

[0082] Step S400: When the scum removal mechanism pushes the agglomerated scum toward the scum collection area, the height difference between the irregular plate and the partition is used to guide the scum into the scum collection tank, and the clear water after the scum is removed by air flotation separation is discharged from the separation chamber through the liquid outlet.

[0083] Step S500: After the slag removal mechanism disengages from the separation chamber along with the transmission chain, the telescopic component is activated to drive the scraper bar to move against the side wall of the substrate and squeeze or release the elastic air storage bag. The air pressure in the slag pusher plate adsorption tank is adjusted through the air source delivery pipeline to cause deformation and disturbance of the barrier membrane, thereby removing the residual floating slag on the end face of the slag removal mechanism.

[0084] The air flotation method for treating petroleum wastewater provided in this embodiment relies on the adaptive extension and retraction of the side scrapers, the gathering of the hinged plates, and the height difference of the irregularly shaped plates to construct a continuous process of wastewater introduction, air flotation, scum gathering, scum collection, and residue cleaning. When the petroleum wastewater flows into the separation chamber and passes through the aeration reaction zone, the bubbles generated by aeration adhere to the scum and carry it to the surface. Subsequently, the drive mechanism moves the transmission chain and the scum removal mechanism. After the scum pusher plate comes into contact with the scum and is subjected to force, on the one hand, as the amount of scum gathered in the area to be removed by the scum pusher plate increases or decreases, the side scrapers at both ends of the drive base plate receiving cavity extend and retract in the second direction, thereby adaptively conforming to the inner wall of the separation chamber, preventing scum from escaping through the gaps and reducing frictional wear between the side scrapers and the pool wall. On the other hand, it drives the hinged plates to rotate to... The scum is guided to gather, and the scum removal mechanism pushes the gathered scum towards the scum collection area, avoiding the accumulation of scum on both sides of the scum pusher plate. The height difference between the irregular plate and the partition plate effectively prevents the scum from flowing back, ensuring that the scum stably flows into the scum collection tank. The clear water separated by air flotation is discharged through the outlet. When the scum removal mechanism leaves the separation chamber with the transmission chain, the telescopic component drives the scraper to move against the side wall of the substrate, simultaneously squeezing or releasing the elastic air storage bag. The air pressure in the adsorption tank of the scum pusher plate is adjusted through the air source delivery pipeline, causing the barrier membrane to deform and disturb, thereby efficiently removing the scum remaining on the end face of the scum removal mechanism. The entire process and device structure are highly compatible, with each step closely linked. It not only adapts to the differences in the characteristics of scum from different batches of petroleum wastewater, but also achieves automated continuous processing, improving the stability and practicality of petroleum wastewater air flotation treatment.

[0085] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0087] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0088] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A flotation-type petroleum wastewater treatment device, characterized in that, include: The flotation tank has a separation chamber; A drive mechanism is provided on the flotation tank, and the drive mechanism has a transmission chain located above the separation chamber and capable of rotating in a first direction; At least one slag removal mechanism includes a base plate disposed on the transmission chain and a slag pusher plate connected to the base plate and capable of moving toward or away from the base plate in the first direction. The substrate has a receiving cavity extending in a second direction, and the opposite ends of the receiving cavity are respectively provided with side scrapers that can extend and retract in the second direction. The slag pusher is provided with a pusher block that extends into the receiving cavity and is in drive cooperation with the side scrapers. When the slag pusher is subjected to a pressing force toward the substrate, the slag pusher can drive the side scraper to extend and retract in the second direction via the pusher block, so as to adaptively adjust the contact pressure between the side scraper and the inner wall of the separation chamber. The substrate has connecting portions at both ends of its surface facing the slag pusher plate along the second direction. Each connecting portion is rotatably connected to a hinged plate. The ends of the two hinged plates facing away from the connecting portions are movably connected to the opposite ends of the slag pusher plate. When the slag pusher plate is subjected to a pressing force toward the substrate, the hinged plates can rotate around the connecting axis with the connecting portion, and the slag pusher plate moves toward the substrate between the two hinged plates, so that the slag gathers in the area between the two hinged plates. The cavity contains a sliding connection to a pressure block that at least partially abuts against the push block; the side scraper is provided with at least one guide rod extending to slide and connect with the pressure block at one end away from the side wall of the separation cavity, and the guide rod is fitted with an elastic element at both ends that are respectively connected to the pressure block and the side scraper.

2. The air flotation type petroleum wastewater treatment device according to claim 1, characterized in that, The driving mechanism includes gear shafts spaced apart along the first direction on the flotation tank, and a driving member that is pulverizedly connected to at least one gear shaft. Two of the transmission chains are arranged along the second direction, and each of the transmission chains is connected to two gear shafts respectively; at least one of the slag removal mechanisms is fixedly connected to the two transmission chains at both ends along the second direction.

3. The air flotation type petroleum wastewater treatment device according to claim 1, characterized in that, The slag removal mechanism also includes a support frame fixedly connected to the transmission chain and at least one telescopic member installed on the support frame, the output end of which is connected to the top surface of the substrate.

4. The air flotation type petroleum wastewater treatment device according to claim 3, characterized in that, The substrate is provided with a barrier film, which covers the circumferential side of the slag pusher away from the substrate. The slag pusher plate has multiple adsorption grooves with openings facing the barrier membrane arranged at intervals on the end face away from the substrate, and each adsorption groove is connected to a gas source delivery pipeline. The gas supply pipeline can fill or extract gas into the adsorption tank to adjust the gas pressure in the adsorption tank, so that the barrier membrane deforms and disturbs in the area corresponding to the adsorption tank along the direction closer to or away from the slag pusher plate.

5. The air flotation type petroleum wastewater treatment device according to claim 4, characterized in that, A scraper strip is fixedly connected to the support frame, and the scraper strip is attached to the side end face of the substrate opposite to the slag pusher plate. The substrate is provided with a pressing part extending toward the scraper bar. An elastic air storage bag is sandwiched between the pressing part and the scraper bar. The elastic air storage bag is connected to the end of the air source delivery pipeline away from the adsorption tank. When the telescopic member drives the substrate to move, the scraper bar simultaneously scrapes off the floating slag attached to the surface of the substrate and simultaneously presses or releases the elastic air storage bag to adjust the air pressure in the adsorption tank.

6. The air flotation type petroleum wastewater treatment device according to claim 1, characterized in that, The flotation tank is provided with an inlet and an outlet at opposite ends along the first direction, which are connected to the separation chamber. A baffle is provided in the separation chamber near the liquid inlet, and a shaped plate is provided in the area above the liquid outlet; the baffle and multiple side walls of the separation chamber enclose an aeration reaction area, and the shaped plate and multiple side walls of the separation chamber enclose a scum collection area.

7. The air flotation type petroleum wastewater treatment device according to claim 6, characterized in that, The partition plate has a first end portion at one end facing away from the bottom wall of the separation chamber, and the irregularly shaped plate has a second end portion at one end facing away from the bottom wall of the separation chamber; Wherein, the distance between the first end and the bottom wall of the separation cavity in the third direction is less than the distance between the second end and the bottom wall of the separation cavity in the third direction.

8. A method for treating petroleum wastewater by air flotation, the method being implemented based on the air flotation petroleum wastewater treatment device as described in any one of claims 1-7, the method comprising: The oil wastewater is fed into the separation chamber through the inlet of the flotation tank, allowing the wastewater to flow through the aeration reaction zone. The bubbles generated by the aeration adhere to the scum in the wastewater, causing the scum to float to the surface. Start the drive mechanism to drive the transmission chain along the first direction, thereby driving the slag removal mechanism to move synchronously with the chain; During the movement of the slag removal mechanism, the slag pusher plate comes into contact with the floating slag and is subjected to force, which drives the side scrapers at both ends of the base plate receiving cavity to extend and retract in the second direction, adaptively fitting the inner side wall of the separation cavity, and guiding the floating slag to gather through the hinge plate. When the scum removal mechanism pushes the gathered scum toward the scum collection area, the height difference between the irregular plate and the baffle is used to guide the scum into the scum collection tank, and the clear water after the scum is removed by air flotation separation is discharged from the separation chamber through the liquid outlet. After the slag removal mechanism disengages from the separation chamber along with the transmission chain, the telescopic component is activated to drive the scraper bar to move against the side wall of the substrate and squeeze or release the elastic air storage bladder. The air pressure in the adsorption tank of the slag pusher plate is adjusted through the air source delivery pipeline to cause deformation and disturbance of the barrier membrane, thereby removing the residual floating slag on the end face of the slag removal mechanism.

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