High-salt high-cod sewage treatment system

Abstract

The application provides a high-salt and high-COD sewage treatment system, which comprises a pretreatment mechanism, a sedimentation tank, a hydrolysis acidification tank, an aerobic tank, an anaerobic tank, a secondary sedimentation tank and an MVR system, wherein the pretreatment mechanism comprises a first-stage water treatment tank, a second-stage water treatment tank and a third-stage water treatment tank which are sequentially connected in the water flow direction, and the first-stage water treatment tank, the second-stage water treatment tank and the third-stage water treatment tank are respectively provided with a first-stage filter assembly, a second-stage filter assembly and a third-stage filter assembly which are used for filtering the foreign matters in the sewage step by step. The multiple filtering of the first-stage filter assembly, the second-stage filter assembly and the third-stage filter assembly can effectively remove the foreign matters in the sewage, so that the subsequent process steps can purify the sewage, and the foreign matters can not react with the reagents in the subsequent treatment process to generate more difficult-to-treat substances, thereby affecting the final wastewater treatment effect.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system for high-salt, high-COD wastewater. Background Technology

[0002] High-salt, high-COD (chemical oxygen demand) wastewater usually refers to wastewater with severe organic pollution in water bodies. It mainly comes from various sources such as industrial production, agricultural discharge, and domestic sewage. In particular, wastewater from industries such as chemical, pharmaceutical, printing and dyeing, and papermaking often has a high COD value because they use a large amount of organic raw materials in their production processes.

[0003] Currently, wastewater treatment processes generally involve sequentially passing wastewater through pretreatment, sedimentation, hydrolysis acidification, aerobic tanks, anaerobic tanks, secondary sedimentation tanks, and an MVR system (used to recover salts from wastewater) to purify it. The pretreatment process primarily removes impurities from the wastewater. However, current technologies are not ideal for pretreatment, often leaving behind a significant amount of impurities. These impurities may react with treatment agents to form more difficult-to-treat substances, thus affecting the final wastewater treatment outcome. Summary of the Invention

[0004] The main objective of this invention is to provide a high-salt, high-COD wastewater treatment system to solve the problem in the prior art where pretreated wastewater still contains a large number of impurities, thus affecting the final wastewater treatment effect.

[0005] To solve the above problems, the present invention adopts the following technical solution: a high-salt, high-COD wastewater treatment system, comprising a pretreatment mechanism, a sedimentation tank, a hydrolysis acidification tank, an aerobic tank, an anaerobic tank, a secondary sedimentation tank, and an MVR system. The pretreatment mechanism includes a primary water treatment tank, a secondary water treatment tank, and a tertiary water treatment tank connected sequentially along the water flow direction. The primary water treatment tank, the secondary water treatment tank, and the tertiary water treatment tank are respectively equipped with a primary filtration component, a secondary filtration component, and a tertiary filtration component for filtering foreign matter in the wastewater step by step.

[0006] The primary filtration assembly includes a mesh conveyor belt located between the inlet and outlet of the primary water treatment tank, with the output end of the mesh conveyor belt extending to the outside of the primary water treatment tank.

[0007] The secondary filtration assembly includes at least one grid assembly, and a foreign matter removal assembly is provided on the side of the grid assembly away from the primary filtration assembly;

[0008] The three-stage filtration assembly includes an aeration assembly and a scraping assembly respectively disposed at the bottom and top of the three-stage water treatment tank.

[0009] Furthermore, a first foreign object discharge channel is provided on one side of the primary water treatment tank, and the output end of the mesh conveyor belt extends above the first foreign object discharge channel. A plurality of elastic plates are provided on the side of the primary water treatment tank near the first foreign object discharge channel. The bottom ends of the plurality of elastic plates are fixedly connected to the primary water treatment tank, and the top ends of the plurality of elastic plates extend toward the mesh conveyor belt.

[0010] Furthermore, the fence assembly includes a fixed base and a plurality of partitions evenly distributed on the fixed base. The bottom ends of the plurality of partitions are fixedly connected to the fixed base, and the top ends of the plurality of partitions extend upward at an angle away from the primary water treatment tank. A gap is provided between each pair of adjacent partitions, and one end of the foreign object cleaning assembly slides through the corresponding gap to clean the foreign objects in the gap.

[0011] Furthermore, the foreign object removal assembly includes multiple removal parts, each of which includes a connecting rod and multiple push rod assemblies with one end fixed to the connecting rod. The free ends of the multiple push rod assemblies correspond one-to-one with the multiple gaps and are used to remove foreign objects in the multiple gaps. In the secondary water treatment tank, on two adjacent side walls located in the direction of sewage flow, power units for driving the multiple push rod assemblies to move are symmetrically arranged.

[0012] Furthermore, each of the power units includes a driving wheel and a driven wheel spaced apart vertically. A chain is sleeved on the outside of the driving wheel and the driven wheel. Multiple cleaning units are evenly arranged along the circumference of the chain. The two ends of the connecting rod of each cleaning unit are fixedly connected to the chains of two power units respectively. The two driving wheels are fixedly connected by a shaft. A first motor is fixedly mounted on one side of one of the power units, and the output end of the first motor is fixedly connected to the corresponding driving wheel.

[0013] Furthermore, a conveying assembly is mounted on the top of the secondary water treatment tank. When the cleaning unit moves along the chain to the top of the power unit and moves away from the fence assembly, multiple push rod assemblies of the cleaning unit are located directly above the conveying assembly. Each push rod assembly includes a fixed block with one end fixed to the connecting rod, a rotating plate rotatably connected to the other end of the fixed block, and a locking part for limiting the rotation of the rotating plate. The conveying assembly has a stop part on the side near the cleaning unit for releasing the restriction of the locking part.

[0014] Furthermore, the free end of the fixed block is provided with a groove, and one end of the rotating plate is fixed with a protrusion. The protrusion is rotatably connected to the groove by a pin. The protrusion is also provided with a first through hole. The two sides of the groove are respectively provided with second through holes corresponding to the first through hole. The snap-fit ​​part includes a telescopic rod slidably disposed in the first through hole. The two ends of the telescopic rod extend into the two second through holes respectively. Slider blocks are slidably disposed in the two second through holes respectively. One end of the slider extends out of the second through hole and away from the telescopic rod. When the push rod assembly moves to the stop part, the stop part pushes the two sliders to extend closer to the telescopic rod and pushes the two ends of the telescopic rod into the first through hole.

[0015] Furthermore, the conveying assembly includes a housing with an opening at the top and one side and a conveyor belt disposed inside the housing. The stop portion includes a plurality of blocks fixed to the side of the housing near the cleaning portion. Between each pair of adjacent blocks is a receiving space for accommodating the latching portion. When the latching portion moves into the receiving space, the corresponding two blocks press against the two sliders of the stop portion.

[0016] Furthermore, the tertiary water treatment tank is internally equipped with two vertical plates, which divide the tertiary water treatment tank into a scum pool and collection pools located on both sides of the scum pool. The scraping assembly includes a scraper mounted on the top of the tertiary water treatment tank and a driving assembly. The driving assembly is used to drive the scraper to move back and forth towards the two collection pools respectively.

[0017] Furthermore, the drive assembly includes two lead screws and two drive motors for driving the two lead screws to rotate. The two lead screws are disposed at the top of the tertiary water treatment tank and spaced apart along the width direction of the tertiary water treatment tank. Each lead screw is screwed with a movable block, and the two ends of the scraper are respectively connected to the two movable blocks.

[0018] The beneficial effects of this invention are:

[0019] 1. Through multiple filtration stages including primary, secondary, and tertiary filtration components, foreign matter in wastewater can be effectively removed, facilitating subsequent wastewater purification processes and preventing foreign matter from reacting with reagents in later treatment processes to generate substances that are more difficult to treat, thereby affecting the final wastewater treatment effect.

[0020] 2. By setting up a mesh conveyor belt, conveying components, and scraping components, foreign objects can be automatically discharged, eliminating the need for manual cleaning of foreign objects filtered by the primary, secondary, and tertiary filter components;

[0021] 3. By installing a foreign object removal component, foreign objects can be prevented from getting stuck in the gaps and affecting the flow of sewage. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a perspective view of the pretreatment components of the high-salt, high-COD wastewater treatment system of the present invention;

[0024] Figure 2 This is a top view of the pretreatment components of the high-salt, high-COD wastewater treatment system of the present invention;

[0025] Figure 3 for Figure 2 AA view;

[0026] Figure 4 for Figure 2 BB view;

[0027] Figure 5 for Figure 4 Enlarged view of part D;

[0028] Figure 6 for Figure 5 CC view;

[0029] Figure 7 This is a three-dimensional structural diagram of the push rod assembly.

[0030] Explanation of reference numerals in the attached figures

[0031] 100. Pretreatment unit; 10. Primary water treatment tank; 101. Inlet end; 102. Outlet end; 20. Secondary water treatment tank; 201. Recessed area; 30. Tertiary water treatment tank; 301. Vertical plate; 302. Scum tank; 303. Collection tank;

[0032] 1. Primary filter assembly; 11. Mesh conveyor belt; 12. Mesh belt; 13. Perforation; 14. Drive roller; 15. Driven roller; 16. Elastic plate;

[0033] 2. Secondary filter assembly; 21. Barrier assembly; 22. Mounting base; 23. Partition plate;

[0034] 3. Foreign object removal assembly; 31. Cleaning section; 32. Connecting rod; 33. Push rod assembly; 34. Fixing block; 341. Groove; 342. Second through hole; 35. Rotating plate; 351. Protrusion; 352. First through hole; 36. Snap-fit ​​part; 361. Telescopic rod; 3611. First sleeve; 3612. Second sleeve; 3613. First spring; 362. Slider; 37. Power unit; 371. Drive wheel; 372. Driven wheel; 373. Chain; 374. Shaft; 38. First motor;

[0035] 4. Conveying assembly; 41. Housing; 42. Conveyor belt; 43. Stop; 431. Stop block; 432. Accommodation space;

[0036] 5. Three-stage filtration assembly; 51. Aeration assembly; 52. Scraper assembly; 521. Scraper; 5212. Airbag; 5213. Through channel; 5214. Fixing rod; 522. Drive assembly; 5211. Lead screw; 5222. Drive motor; 523. Moving block;

[0037] 6. First foreign object discharge channel; 7. Second foreign object discharge channel. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Please see Figures 1 to 2 As shown, a high-salinity, high-COD wastewater treatment system includes a pretreatment unit 100, a sedimentation tank, a hydrolysis acidification tank, an aerobic tank, an anaerobic tank, a secondary sedimentation tank, and an MVR system connected in sequence. The sedimentation tank, hydrolysis acidification tank, aerobic tank, anaerobic tank, secondary sedimentation tank, and MVR system are existing technologies and will not be described in detail here. The focus of this invention is on the pretreatment unit 100. Through multi-stage filtration in the pretreatment unit 100, impurities in the wastewater are removed to facilitate subsequent purification steps and avoid affecting the final wastewater treatment effect.

[0040] The pretreatment mechanism 100 of the present invention includes a primary water treatment tank 10, a secondary water treatment tank 20, and a tertiary water treatment tank 30, which are sequentially connected along the water flow direction. The primary water treatment tank 10, the secondary water treatment tank 20, and the tertiary water treatment tank 30 are respectively provided with a primary filter assembly 1, a secondary filter assembly 2, and a tertiary filter assembly 5 for filtering foreign matter in the sewage step by step.

[0041] Please see Figure 3 As shown, specifically, the primary filtration assembly 1 includes a mesh conveyor belt 11, located between the inlet end 101 and the outlet end 102 of the primary water treatment tank 10. The outlet end of the mesh conveyor belt 11 extends to the outside of the primary water treatment tank 10 to discharge foreign matter. In practice, wastewater flows into the primary water treatment tank 10 from the inlet end 101 and is then filtered by the mesh conveyor belt 11. It should be noted that the mesh conveyor belt 11 is existing technology, including a ring-shaped mesh belt 12, a drive roller 14 and a driven roller 15 for driving the mesh belt 12 to rotate, and a synchronous motor, which will not be described in detail here. Wastewater flows into the bottom of the primary water treatment tank 10 through multiple holes 13 on the mesh conveyor belt 11, while foreign matter is intercepted by the mesh conveyor belt 11 and removed by the mesh conveyor belt 11. Specifically, a first foreign object discharge channel 6 is provided on one side of the primary water treatment tank 10, and the output end of the mesh conveyor belt 11 extends above the first foreign object discharge channel 6 to discharge foreign objects into the first foreign object discharge channel 6.

[0042] Preferably, the primary water treatment tank 10 is provided with a plurality of elastic plates 16 on the side near the first foreign matter discharge channel 6. The bottom ends of the plurality of elastic plates 16 are fixedly connected to the primary water treatment tank 10, and the top ends of the plurality of elastic plates 16 extend toward the mesh conveyor belt 11. In this way, foreign matter adhering to the surface of the mesh conveyor belt 11 is scraped off by the plurality of elastic plates 16, preventing foreign matter from flowing into the filtered sewage.

[0043] Please see Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the secondary filtration assembly 2 includes at least one barrier assembly 21. Specifically, the barrier assembly 21 includes a fixed base 22 and multiple partitions 23 evenly distributed on the fixed base 22. The bottom ends of the multiple partitions 23 are fixedly connected to the fixed base 22, and the top ends of the multiple partitions 23 extend upwards at an angle away from the primary water treatment tank 10. That is, the barrier assembly 21 is inclined from bottom to top towards the side away from the primary filtration assembly 1. A gap is provided between every two adjacent partitions 23 to allow sewage to pass through while intercepting foreign objects.

[0044] Preferably, there are multiple fence components 21, which are fixedly installed at the bottom of the secondary water treatment tank 20 and arranged sequentially along the direction of wastewater flow. The gap between the two partitions 23 of the fence component 21 is smaller the further away from the primary water treatment tank 10. This allows for better filtration of wastewater.

[0045] In this embodiment, a foreign matter cleaning component 3 is provided on the side of the barrier assembly 21 away from the primary filter assembly 1. One end of the foreign matter cleaning component 3 is slidably inserted into the corresponding gap to clean foreign matter in the gap. That is, the foreign matter cleaning component 3 is used to clean foreign matter embedded between the two partitions 23, so as to prevent foreign matter from blocking the gap between the two partitions 23 and affecting the flow of sewage.

[0046] Specifically, the foreign object cleaning component 3 includes multiple cleaning parts 31. Each cleaning part 31 includes a connecting rod 32 and multiple push rod assemblies 33 with one end fixed on the connecting rod 32. The free ends of the multiple push rod assemblies 33 correspond one-to-one with multiple gaps, thereby cleaning the gap between the two partitions 23. In the secondary water treatment tank 20, power units 37 are symmetrically arranged on two side walls adjacent to each other in the direction of sewage flow. The power units 37 are used to drive the multiple push rod assemblies 33 to move.

[0047] Please continue reading Figure 4 As shown, in this embodiment, each power unit 37 includes a driving wheel 371 and a driven wheel 372 spaced apart vertically. A chain 373 is sleeved on the outer side of the driving wheel 371 and the driven wheel 372. Multiple cleaning unit assemblies 31 are evenly arranged along the circumference of the chain 373. The two ends of the connecting rod 32 of each cleaning unit 31 are fixedly connected to the chains 373 of two power units 37, thereby driving the multiple cleaning units 31 to move via the chain 373. The two driving wheels 371 are fixedly connected by a shaft 374, thereby enabling the two driving wheels 371 to rotate synchronously. A first motor 38 is fixedly mounted on one side of one of the power units 37, and the output end of the first motor 38 is fixedly connected to the corresponding driving wheel 371. It should be noted that the driving wheel 371 and the driven wheel 372 are sprockets in the prior art, and therefore can drive the chain 373 to rotate.

[0048] During implementation, the first motor 38 is started, driving the drive wheel 371 to rotate. The drive wheel 371, in conjunction with the driven wheel 372, drives the chain 373 to rotate, thereby causing the multiple cleaning parts 31, located between the two power units 37, to move along the closed loop formed by the chain 373. When the chain 373 drives the multiple push rod assemblies 33 of the cleaning parts 31 to move to the side of the power unit 37 near the grid, one end of each push rod is inserted into the corresponding gap to clean the foreign objects in the gap. It should be noted that when the chain 373 drives the cleaning unit 31 to move upward, it can give an upward force to the foreign objects in the gap, that is, push the foreign objects out of the grid assembly 21 from bottom to top. At the same time, since the grid assembly 21 is inclined and the power unit 37 is vertical, each push rod of the cleaning unit 31 will also give a lateral force to the foreign objects in the gap during the movement. In other words, it will give the foreign objects in the gap an inclined upward force from the grid assembly 21 toward the primary water treatment tank 10, thereby pushing the foreign objects toward the side of the grid inlet direction, preventing the foreign objects from getting stuck in the gap, and achieving better cleaning of the foreign objects.

[0049] In this embodiment, a conveying assembly 4 is mounted on the top of the secondary water treatment tank 20. When the cleaning unit 31 moves along the chain 373 to the top of the power unit 37 and moves away from the fence assembly 21 on the chain 373, the multiple push rod assemblies 33 of the cleaning unit 31 are located directly above the conveying assembly 4. In this way, the foreign objects cleaned by the multiple push rod assemblies 33 are poured onto the conveying assembly 4, and then the foreign objects are discharged through the conveying assembly 4.

[0050] Please see Figures 4 to 7 As shown, specifically, each push rod assembly 33 includes a fixing block 34 fixed at one end to the connecting rod 32, a rotating plate 35 rotatably connected to the other end of the fixing block 34, and a locking part 36 for restricting the rotation of the rotating plate 35. The conveying assembly 4 has a stop part 43 on the side near the cleaning part 31 for releasing the restriction of the locking part 36. It should be noted that, under normal conditions, the locking part 36 restricts the rotation of the rotating plate 35.

[0051] In practice, when multiple push rod assemblies 33 pour foreign objects onto the conveying assembly 4, the chain 373 continues to drive the multiple push rod assemblies 33 to move closer to the conveying assembly 4 until the stop part 43 of the conveying assembly 4 abuts against the locking part 36. This releases the locking part 36 from restricting the rotating plate 35. At this time, the rotating plate 35 will rotate relative to the fixed block 34, and at the same time, the rotating plate 35 abuts against the conveying assembly 4, so that the rotating plate 35 rotates upward, avoiding interference between the push rod assemblies 33 and the conveying assembly 4. When the rotating plate 35 moves to below the conveying assembly 4, it rotates and resets by its own weight. At this time, the locking part 36 restricts the rotating plate 35 again.

[0052] Specifically, the free end of the fixed block 34 is provided with a groove 341, and one end of the rotating plate 35 is fixed with a protrusion 351. The protrusion 351 is inserted into the groove 341 and is rotatably connected to the groove 341 by a pin. The protrusion 351 is also provided with a first through hole 352. The two sides of the groove 341 are respectively provided with second through holes 342 corresponding to the first through hole 352. The snap-fit ​​part 36 includes a telescopic rod 361 that is slidably disposed in the first through hole 352. The two ends of the telescopic rod 361 extend into the two second through holes 342 respectively, thereby limiting the rotating plate 35. That is, the rotating plate 35 is limited by the cooperation of the telescopic rod 361 and the pin. The two second through holes 342 are respectively provided with sliders 362. One end of the slider 362 passes through the second through hole (342) and extends away from the telescopic rod 361.

[0053] Under normal conditions, the two ends of the telescopic rod 361 are respectively located in the two second through holes 342 to limit the rotation plate 35. When the locking part 36 moves to the stop part 43, the stop part 43 presses the two sliders 362 located in the second through holes 342 toward the direction closer to the first through hole 352. That is, the stop part 43 pushes the two sliders 362 toward the direction closer to the telescopic rod 361 and pushes the two ends of the telescopic rod 361 into the first through hole 352. At this time, the locking part 36 releases the restriction on the rotation plate 35.

[0054] It should be noted that in this embodiment, the telescopic rod 361 includes a first sleeve 3611 and a second sleeve 3612. The first sleeve 3611 and the second sleeve 3612 are each a cylinder with one open end. The open end of the second sleeve 3612 passes through the open end of the first sleeve 3611 and is slidably connected to the first sleeve 3611. A first spring 3613 is provided inside the second sleeve 3612. The two ends of the first spring 3613 abut against the first sleeve 3611 and the second sleeve 3612 respectively, for moving the first sleeve 3611 and the second sleeve 3612 in a direction away from each other. In implementation, the stop part 43 presses the two sliders 362. When the pressure is greater than the elasticity of the first spring 3613, the first spring 3613 is compressed, and the first sleeve 3611 and the second sleeve 3612 move in a direction closer to each other. When the first sleeve 3611 and the second sleeve 3612 are both inside the first through hole 352, the locking part 36 releases the restriction on the rotating plate 35.

[0055] Preferably, each of the second through holes 342 has an internal thread at the end away from the first through hole 352, and each of the sliders 362 has an external thread that matches the internal thread at the end near the first through hole 352. During installation, by rotating the slider 362, one end of the slider 362 is inserted into the second through hole 342, and the slider 362 is slidably connected to the second through hole 342. By setting the external and internal threads, the slider 362 is prevented from sliding out of the second through hole 342.

[0056] In this embodiment, the conveying assembly 4 includes a housing 41 with an opening at the top and one side, and a conveyor belt 42 disposed inside the housing 41. The conveyor belt 42 is a prior art material and can be an annular belt made of rubber. It is used in conjunction with a drive roller, a driven roller, and a synchronous motor to drive the conveyor belt 42 to rotate, thereby conveying foreign objects. The stop part 43 includes a plurality of stops 431 fixed on one side of the housing 41 near the cleaning part 31. Each pair of adjacent stops 431 has a receiving space 432 for accommodating the locking part 36. When the locking part 36 moves into the receiving space 432, the corresponding two stops 431 squeeze the two sliders 362 of the locking part 36.

[0057] Please see Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the three-stage filtration assembly 5 includes an aeration assembly 51 and a scraping assembly 52 respectively disposed at the bottom and top of the three-stage water treatment tank 30. The aeration assembly 51 is existing technology; it injects gas into the water and generates microbubbles. These bubbles quickly attach to suspended foreign matter and lift it to the surface of the wastewater within the three-stage water treatment tank 30. This forms a easily removable floating layer of suspended foreign matter. The scraping assembly 52 is disposed at the top of the three-stage water treatment tank 30 and is used to scrape away suspended foreign matter from the wastewater surface.

[0058] Specifically, the tertiary water treatment tank 30 is internally equipped with two vertical plates 301, which divide the tertiary water treatment tank 30 into a scum pool 302 and a collection pool 303 located on both sides of the scum pool 302. The scraping component 52 pushes the suspended foreign objects in the scum pool 302 into the collection pool 303.

[0059] In this embodiment, the scraping assembly 52 includes a scraper 521 mounted on top of the tertiary water treatment tank and a drive assembly 522. The drive assembly 522 is used to drive the scraper 521 to reciprocate towards the two collection tanks 303 respectively. Specifically, the drive assembly 522 includes two lead screws 5211 and two drive motors 5222 for driving the two lead screws 5211 to rotate. The two lead screws 5211 are set at the top of the tertiary water treatment tank 30 and are spaced apart along the width direction of the tertiary water treatment tank 30. Each lead screw 5211 is screwed with a moving block 523. The moving block 523 is slidably connected to the top of the tertiary water treatment tank 30. The two ends of the scraper 521 are respectively connected to the two moving blocks 523.

[0060] Preferably, an airbag 5212 is fixedly provided in the middle or lower part of the scraper 521, and a through groove 5213 is provided in the upper part of the scraper 521 along the axial direction of the scraper 521. The length direction of the through groove 5213 is perpendicular to the flow direction of the sewage. A fixed rod 5214 is slidably passed through the through groove 5213, and the two ends of the fixed rod 5214 are fixedly connected to two moving blocks 523.

[0061] During implementation, two drive motors 5222 are activated, driving two lead screws 5211 to rotate in either direction. This, in turn, causes two moving blocks 523, screwed to the lead screws 5211, to reciprocate along the circumference of the lead screws 5211. This allows the scraper 521 to clean suspended debris from the scum tank 302 into the two collection tanks 303. It should be noted that the wastewater level fluctuates due to the water flow rate. When the level is too high, the scraper 521 may scrape out a large amount of liquid while removing suspended debris. Conversely, when the level is too low, less scum is removed per scraping, affecting the wastewater treatment speed. By using a through-channel 5213 and a fixed rod 5214, the scraper 521 can move up and down. The air bladder 5212 adapts to different wastewater heights, ensuring the bottom of the scraper 521 is always below the liquid level for better cleaning of suspended debris on the wastewater surface.

[0062] In a specific implementation of the present invention, wastewater is first discharged into the primary water treatment tank 10 through the inlet end 101. The wastewater is filtered by the mesh conveyor belt 11. The impurities at the filter are transferred to the first foreign matter discharge channel 6 through the mesh conveyor belt 11. The wastewater filtered by the mesh conveyor belt 11 flows to the secondary water treatment tank 20 through the outlet end 102 of the primary water treatment tank 10.

[0063] Water in the secondary water treatment tank 20 is filtered by the screen assembly 21. Foreign matter from the filter is transferred to the conveying assembly 4 via the foreign matter removal assembly 3, and then discharged by the conveying assembly 4. The filtered wastewater continues to be discharged into the tertiary water treatment tank 30, specifically by a wastewater pump. It should be noted that the secondary water treatment tank 20 has a recessed area 201 near the bottom of the primary water treatment tank (e.g., ...). Figure 2 As shown in the figure, the secondary water treatment tank 20 is used to receive the settled sludge, and the settled sludge is pumped away by a sludge pump (not shown in the figure). In addition, the secondary water treatment tank 20 is provided with a second foreign matter discharge channel 7 at the output end of the conveyor belt 42 to receive foreign matter discharged from the output end of the conveyor belt 42.

[0064] After wastewater is discharged into the tertiary water treatment tank 30, the aeration component 51 is activated. The bubbles generated by the aeration component 51 encapsulate foreign objects and lift them to the surface of the wastewater in the tertiary water treatment tank 30, forming a floating layer. Then, the scraping component 52 is activated to remove the foreign objects into the collection tank 303. Finally, the filtered water is discharged to the next process for further purification. This invention effectively removes foreign objects from wastewater through multiple filtration stages: primary filtration component 1, secondary filtration component 2, and tertiary filtration component 5. This facilitates subsequent purification steps and prevents foreign objects from reacting with chemicals in later treatment processes to form more difficult-to-treat substances, thus affecting the final wastewater treatment effect.

[0065] The above description is merely a preferred embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A high-salinity, high-COD wastewater treatment system, comprising a pretreatment unit (100), a sedimentation tank, a hydrolysis acidification tank, an aerobic tank, an anaerobic tank, a secondary sedimentation tank, and an MVR system, characterized in that, The pretreatment mechanism (100) includes a primary water treatment tank (10), a secondary water treatment tank (20) and a tertiary water treatment tank (30) connected sequentially along the water flow direction. The primary water treatment tank (10), the secondary water treatment tank (20) and the tertiary water treatment tank (30) are respectively equipped with a primary filter assembly (1), a secondary filter assembly (2) and a tertiary filter assembly (5) for filtering foreign matter in the sewage step by step. The primary filtration assembly (1) includes a mesh conveyor belt (11), which is located between the inlet end (101) and the outlet end (102) of the primary water treatment tank (10), and the output end of the mesh conveyor belt (11) extends to the outside of the primary water treatment tank (10). The secondary filter assembly (2) includes at least one barrier assembly (21), and a foreign matter removal assembly (3) is provided on the side of the barrier assembly (21) away from the primary filter assembly (1). The three-stage filtration assembly (5) includes an aeration assembly (51) and a scraping assembly (52) respectively disposed at the bottom and top of the three-stage water treatment tank (30). The fence assembly (21) includes a fixed base (22) and a plurality of partitions (23) evenly distributed on the fixed base (22). The bottom ends of the plurality of partitions (23) are fixedly connected to the fixed base (22), and the top ends of the plurality of partitions (23) extend upward in a direction away from the primary water treatment tank (10). A gap is provided between each pair of adjacent partitions (23). One end of the foreign matter cleaning assembly (3) slides through the corresponding gap to clean the foreign matter in the gap. The foreign object cleaning component (3) includes multiple cleaning parts (31), each of the cleaning parts (31) includes a connecting rod (32) and multiple push rod assemblies (33) with one end fixed on the connecting rod (32). The free ends of the multiple push rod assemblies (33) correspond one-to-one with the multiple gaps and are used to clean foreign objects in the multiple gaps. In the secondary water treatment tank (20), on two adjacent side walls located in the direction of sewage flow, power units (37) for driving the multiple push rod assemblies (33) to move are symmetrically arranged. Each of the power units (37) includes a drive wheel (371) and a driven wheel (372) spaced apart vertically. A chain (373) is sleeved on the outside of the drive wheel (371) and the driven wheel (372). Multiple cleaning units (31) are evenly arranged around the chain (373). The two ends of the connecting rod (32) of each cleaning unit (31) are fixedly connected to the chains (373) of the two power units (37) respectively. The two drive wheels (371) are fixedly connected to each other by a shaft (374). A first motor (38) is fixedly mounted on one side of one of the power units (37). The output end of the first motor (38) is fixedly connected to the corresponding drive wheel (371). The top of the secondary water treatment tank (20) is equipped with a conveying assembly (4). When the cleaning part (31) moves along the chain (373) to the top of the power part (37) and moves away from the fence assembly (21) on the chain (373), multiple push rod assemblies (33) of the cleaning part (31) are located directly above the conveying assembly (4). Each push rod assembly (33) includes a fixing block (34) fixed at one end on the connecting rod (32), a rotating plate (35) rotatably connected to the other end of the fixing block (34), and a locking part (36) for limiting the rotation of the rotating plate (35). The conveying assembly (4) is provided with a stop part (43) for releasing the restriction of the locking part (36) on the side near the cleaning part (31). The free end of the fixed block (34) is provided with a groove (341), and one end of the rotating plate (35) is fixed with a protrusion (351). The protrusion (351) is rotatably connected to the groove (341) by a pin. The protrusion (351) is also provided with a first through hole (352). The two sides of the groove (341) are respectively provided with second through holes (342) corresponding to the first through hole (352). The snap-fit ​​part (36) includes a telescopic rod (361) slidably disposed in the first through hole (352). Both ends of the rod extend into the two second through holes (342), and sliders (362) are slidably disposed in the two second through holes (342). One end of the slider (362) extends out of the second through hole (342) and away from the telescopic rod (361). When the push rod assembly (33) moves to the stop (43), the stop (43) pushes the two sliders (362) to extend closer to the telescopic rod (361) and pushes both ends of the telescopic rod (361) into the first through hole (352). The conveying assembly (4) includes a housing (41) with an opening at the top and on one side and a conveyor belt disposed inside the housing (41). The stop part (43) includes a plurality of stops (431) fixed on one side of the housing (41) near the cleaning part (31). There is a receiving space (432) between each two adjacent stops (431) for accommodating the latching part (36). When the latching part (36) moves into the receiving space (432), the corresponding two stops (431) press the two sliders (362) of the latching part (36).

2. The high-salinity, high-COD wastewater treatment system according to claim 1, characterized in that, The primary water treatment tank (10) has a first foreign object discharge channel (6) on one side. The output end of the mesh conveyor belt (11) extends above the first foreign object discharge channel (6). The primary water treatment tank (10) has multiple elastic plates (16) on the side near the first foreign object discharge channel (6). The bottom ends of the multiple elastic plates (16) are fixedly connected to the primary water treatment tank (10), and the top ends of the multiple elastic plates (16) extend towards the mesh conveyor belt (11).

3. The high-salinity, high-COD wastewater treatment system according to claim 1, characterized in that, The three-stage water treatment tank (30) is internally provided with two vertical plates (301), which divide the three-stage water treatment tank (30) into a scum tank (302) and collection tanks (303) located on both sides of the scum tank (302). The scraping component (52) includes a scraper (521) mounted on the top of the three-stage water treatment tank (30) and a drive component (522). The drive component (522) is used to drive the scraper (521) to move back and forth towards the two collection tanks (303).

4. The high-salinity, high-COD wastewater treatment system according to claim 3, characterized in that, The drive assembly (522) includes two lead screws (5211) and two drive motors (5222) for driving the two lead screws (5211) to rotate. The two lead screws (5211) are located at the top of the three-stage water treatment tank (30) and are spaced apart along the width direction of the three-stage water treatment tank (30). Each lead screw (5211) is screwed with a moving block (523). The two ends of the scraper (521) are respectively connected to the two moving blocks (523).

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