Biological denitrification and dephosphorization MBR sewage treatment system and treatment process thereof

Abstract

The application discloses a biological denitrification and dephosphorization MBR sewage treatment system and a treatment process thereof, and process steps are as follows: 1) pretreatment; 2) anaerobic tank treatment; 3) anoxic tank treatment; 4) aerobic tank treatment; 5) MBR membrane tank treatment; sewage enters the inside of a box through a water inlet, a moving mechanism drives aeration mechanism and scum cleaning mechanism to move, the aeration mechanism performs aeration treatment on the sewage in the box, when the aeration mechanism blows out gas into the sewage through a branch air pipe, the bubbles are scattered by spiral blades, the contact area of the gas and the liquid is further increased, and the aeration effect is enhanced; the scum after the aeration treatment rises, the scum cleaning mechanism scrapes off the scum after the aeration multiple times, collects the scraped-off scum and sends the scum out of the box, the impurities suspended in the sewage are fished, and the sewage after the scum cleaning enters a next treatment procedure through a water outlet.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and specifically relates to a biological nitrogen and phosphorus removal MBR wastewater treatment system and its treatment process. Background Technology

[0002] Biological nitrogen and phosphorus removal MBR wastewater treatment technology is a highly efficient wastewater treatment technology that combines the traditional activated sludge process with membrane separation technology. It has the function of simultaneous nitrogen and phosphorus removal. Wastewater passes through an aerobic tank where it is degraded by nitrifying bacteria. In existing aerobic tank technologies, the aeration pipes are usually fixed at the bottom of the aerobic tank. During aeration, the gas cannot be efficiently and quickly mixed with the wastewater. During the aeration process, the sticky substances secreted by microorganisms easily form foam and adsorb sludge particles to form scum. If the scum is not cleaned in time, it will adhere to the surface of the subsequent membrane treatment, block the membrane pores, increase the cleaning frequency, and ultimately affect the wastewater treatment effect.

[0003] A search revealed an existing technology, CN 120136295 A, which describes an autotrophic denitrification wastewater treatment device and method. This device includes a stirring mechanism, a crushing mechanism, a collection mechanism, and a knocking mechanism. However, these process steps cannot effectively remove nitrogen and phosphorus elements from the wastewater. Another search revealed an existing technology, CN117964113A, which describes a two-stage AO denitrification and phosphorus removal wastewater treatment device. This device uses a sedimentation tank to fuse activated sludge and wastewater, and then uses a drive mechanism to fully mix the activated sludge and wastewater in the anaerobic tank. However, this device lacks an aeration and sludge removal mechanism in the aerobic tank, resulting in low wastewater treatment efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a biological nitrogen and phosphorus removal MBR wastewater treatment system and its treatment process. When the aeration mechanism blows gas into the wastewater through the branch pipe, the bubbles are dispersed by the spiral blades, further increasing the contact area between the gas and the liquid and enhancing the aeration effect. The scum removal mechanism scrapes off the scum that floats to the surface after aeration multiple times and collects the scraped scum and sends it out of the tank. Impurities suspended in the middle layer of the wastewater are retrieved to complete the scum removal work.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A biological nitrogen and phosphorus removal MBR wastewater treatment system includes a pretreatment tank, an anaerobic tank, an anoxic tank, an aerobic tank, and an MBR membrane tank; the system is provided with the pretreatment tank, anaerobic tank, anoxic tank, aerobic tank, and MBR membrane tank in sequence.

[0007] A biological nitrogen and phosphorus removal MBR wastewater treatment system has the following specific steps:

[0008] 1) Pretreatment tank: Large particles such as plastic and branches are filtered out by setting coarse screens with a gap of 20-50 mm, and fine suspended solids such as fibers and hair are filtered out by setting fine screens with a gap of 1-5 mm. This prevents the membrane from wrapping and clogging the equipment. The pH of the wastewater is controlled within the range of 6.5-8.5 by adding HCl or NaOH. A low-speed submersible agitator is used with an agitation speed of 50-60 rpm to prevent sludge deposition.

[0009] 2) Anaerobic tank treatment: Ensure a hydraulic retention time (HRT) of 1-3 hours and a dissolved oxygen concentration of <0.2 mg / L to maintain a strictly anaerobic environment. Keep the sludge concentration at 3,000-5,000 mg / L. Too high a concentration will cause the sludge to float, while too low a concentration will result in insufficient phosphorus release. Use low-speed mechanical stirring with a stirring speed of 20-30 rpm to prevent sludge sedimentation, but avoid excessive stirring that may introduce oxygen.

[0010] 3) Anoxic tank treatment: used for denitrification and denitrification, improves the denitrification efficiency of the system, ensures a hydraulic retention time (HRT) of 2-4 hours, dissolved oxygen concentration <0.5 mg / L, ensures a slightly anoxic environment, and adopts low-speed mechanical stirring with a stirring speed of 10-20 rpm to prevent the denitrification gas generated after sludge deposition from floating to the surface.

[0011] 4) Aerobic tank treatment: Ensure a hydraulic retention time (HRT) of 4-8 hours and a dissolved oxygen concentration of 2-4 mg / L. Aeration is carried out in the aerobic tank through an aeration mechanism. Motor II drives drive shaft I to rotate, drive shaft I drives helical gear I to rotate, helical gear I meshes with helical gear II, helical gear II drives drive shaft II to rotate, drive shaft II drives helical gear III, helical gear III meshes with helical gear IV, helical gear IV drives connecting shaft I to rotate, and connecting shaft I drives the branch pipe and spiral blades to rotate. When gas is blown into the sewage through the branch pipe, the bubbles are broken up by the spiral blades, further increasing the contact area between the gas and the liquid and enhancing the aeration effect. The pore size of the air holes on the branch pipe is ≤2 mm, and the oxygen utilization rate is increased to 30%-40%. The operation cycle is 15 minutes of aeration followed by 5 minutes of aeration stop.

[0012] The scum generated after aeration is cleaned by a scum cleaning mechanism. The walking mechanism inside the scum cleaning mechanism controls the first scraping mechanism and the second scraping mechanism to scrape. The motor V controlled by the walking mechanism controls the rotation of gear III. Gear III meshes with rack III. Rack III is fixed on the support plate. Gear III drives the bracket to move along rack III. Motor VI drives the worm to rotate. The worm meshes with the worm wheel. The worm wheel rotates. The center of the worm wheel meshes with the threaded rod. The rotation of the worm wheel drives the threaded rod to rise and fall. The rise and fall of the threaded rod drives the lifting plate II to rise and fall. The lifting plate drives the adjustment mechanism to move and rise and fall. Motor VIII of the adjustment mechanism controls the rotation of connecting rod I. Connecting rod I drives connecting rod IV to swing through connecting rod II and connecting rod III. Connecting rod IV drives the connecting rod to swing. The connecting rod drives motor IX and connecting shaft II to swing. Connecting shaft II adjusts the position of the first scraping mechanism and the second scraping mechanism.

[0013] The scum removal mechanism on the first scraping mechanism controls the rotation of the lead screw II via motor VII. The lead screw II drives the moving seat to move, which in turn drives the angle stepper motor I to move. The angle stepper motor I controls the rotation of the connecting plate I, which in turn drives the winch wheel to swing. The winch wheel controls the winding and unwinding of the drag line, which in turn drives the lower net bag. When the scum removal mechanism moves to one side of the tank via the walking mechanism, the net bag removes and cleans the suspended impurities in the sewage, avoiding the problem of a large amount of suspended impurities remaining in the lower layer of the sewage after the upper impurities are removed, thus making the cleaning efficiency more efficient. The angle stepper motor II of the first scraping mechanism drives the gear IV to rotate. Gear IV meshes with gear V, which drives the scraper I to rotate, adjusting the tilt angle of scraper I as needed.

[0014] The motors X and XI of the second scraping mechanism control the angle between scraper III and the screen, so that the two sets of scrapers and the screen form an angle, which improves the efficiency of scraping and cleaning scum. The angle stepper motor IV controls scraper IV to swing downward, and scraper IV forms a height difference with scraper II and scraper III at the front end, so that the scum that scraper II and scraper III failed to scrape can be scraped again. The overflow plate set on scraper IV blocks the passage of scum while ensuring the water flow, which further improves the scraping efficiency. The first scraping mechanism and the second scraping mechanism scrape the floating scum in the sewage at a speed of 25-60 rpm for 35-50 minutes to the scum conveying mechanism.

[0015] Motor III of the scum conveying mechanism controls the rotation of lead screw I, which in turn drives the lifting plate I to rise and fall according to the height of the sewage in the tank. Motor IV controls the rotation of the auger to scrape the scum from the top of the sewage and then send it out by the auger. During the scum collection process, the electric push rod pulls the push plate backward, which drives the rack II backward. The rack II meshes with the half gear, which drives the sliding cover to rotate backward. The sliding cover opens to collect the scum. During the scum conveying process, the electric push rod pushes the push plate forward, which drives the rack II forward. The rack II meshes with the half gear, which drives the sliding cover to slide forward. The sliding cover closes to ensure that the scum does not leak during the conveying process, thus completing the cleaning of a large area of ​​scum.

[0016] 5) MBR membrane tank treatment: Through microfiltration membrane with a pore size of 0.01-0.4 μm, suspended solids and bacteria are thoroughly removed, and residual organic matter is degraded. The membrane flux is set to 15-25 L / (m²·h), the aeration intensity is set to 0.3-0.5 Nm³ / (m²·h), and the suction time is every 8-12 min with a 2-3 min pause. UV disinfection is first used at a dosage of 30-40 mJ / cm², and then sodium hypochlorite is added at a dosage of 5-10 mg / L to complete the wastewater treatment process.

[0017] The aerobic tank in step 4) includes an inlet, a tank, a moving mechanism, an aeration mechanism, a scum removal mechanism, a protective cover I, and an outlet. The inlet is located at the front end of the tank, the outlet is located at the rear end of the tank, the moving mechanism is located on one side of the tank, the protective cover I is fixed on both sides of the tank, and the moving mechanism is located inside the protective cover I. The tank is equipped with a scum removal mechanism and an aeration mechanism. The scum removal mechanism is located in the upper layer of the tank, and the aeration mechanism is located in the lower layer of the tank. Both the scum removal mechanism and the aeration mechanism are connected to the moving mechanism. Wastewater enters the tank through the inlet. The moving mechanism drives the aeration mechanism and the scum removal mechanism to move. The aeration mechanism aerates the wastewater in the tank. After aeration, the scum rises and is then removed from the wastewater by the scum removal mechanism. The wastewater after scum removal enters the next treatment process through the outlet.

[0018] The moving mechanism includes a motor I, a motor mounting bracket I, a rocker arm, a sliding shaft, a slide rail, and a connecting frame. The motor I is mounted on the motor mounting bracket I, which is fixed to the outside of the housing. The output end of the motor I is connected to one end of the rocker arm, and the other end of the rocker arm is equipped with a sliding shaft. The sliding shaft is also located within the slide rail and is slidably connected to the slide rail. The slide rail is fixedly connected to a connecting block, which is fixedly connected to a rack I on its lower side. The rack I is located within a slide rail I, which is fixed to the outside of the housing. A connecting frame is fixed to the other side of the rack I. The connecting frame is located inside the box. The upper and lower sets of racks I mesh with gear I simultaneously. Gear I is rotatably connected to positioning shaft I, which is fixed to the outside of the box. Motor I controls the rocker arm to rotate. The rocker arm drives the sliding shaft to slide in the slide plate. While sliding, it drives the slide plate to move. The slide plate drives the lower rack I to move through the connecting block. The upper and lower sets of racks I mesh with gear I simultaneously. Gear I drives the upper and lower sets of racks I to produce relative motion. Rack I drives the connecting frame to move. The connecting frame drives the aeration mechanism and the scum cleaning mechanism to move.

[0019] The aeration mechanism includes a movable frame, a motor II, an air supply pipe, a connecting shaft I, a branch pipe, spiral blades, and a support frame. The movable frame is fixedly connected to the connecting frame. The motor II is mounted on the movable frame, and its output end is connected to the transmission shaft I. Helical gear I is mounted on the transmission shaft I and meshes with helical gear II. The motor II, transmission shaft I, helical gear I, and helical gear II are all housed inside a waterproof cover I. Helical gear II is located at one end of the transmission shaft II, and helical gear III is located at the other end of the transmission shaft II. Helical gear III meshes with helical gear IV. Helical gear III and helical gear IV are housed inside the waterproof cover II. Helical gear IV is mounted on the connecting shaft I, which is located above the air supply pipe. The connecting shaft also has a branch pipe and a spiral blade. The blades and helical blades are simultaneously installed inside the support frame, and the helical blades are rotatably connected to the support frame. The support frame is fixed inside the protective cover II, and the protective cover II is fixed on the movable frame. The drive shaft II passes through the protective cover II and is rotatably connected to the protective cover II. The motor II drives the drive shaft I to rotate, the drive shaft I drives the helical gear I to rotate, the helical gear I meshes with the helical gear II, the helical gear II drives the drive shaft II to rotate, the drive shaft II drives the helical gear III, the helical gear III meshes with the helical gear IV, the helical gear IV drives the connecting shaft I to rotate, and the connecting shaft I drives the branch pipe and the helical blades to rotate. When the gas is blown into the sewage through the branch pipe, the bubbles are dispersed by the helical blades, further increasing the contact area between the gas and the liquid and enhancing the aeration effect.

[0020] The scum removal mechanism includes a support plate, a water pump, water pipes, a scum conveying mechanism, a traveling mechanism, a scum retrieval mechanism, a first scraping mechanism, an adjusting mechanism, and a second scraping mechanism. The support plate is fixedly connected to the connecting frame, the water pump is fixed to the upper part of the support plate and connected to the water pipes, the scum conveying mechanism is located at the lower part of the support plate, two sets of traveling mechanisms are located on both sides of the support plate, and an adjusting mechanism is located at the lower part of the traveling mechanism. The two sets of adjusting mechanisms are respectively connected to the second scraping mechanism and the first scraping mechanism, and the scum retrieval mechanism is located above the first scraping mechanism. The angle of the second scraping mechanism is adjusted by the adjusting mechanism of the scum removal mechanism, and the second scraping mechanism scrapes a large area of ​​scum on the upper part of the sewage to one side. The scraped scum is collected by the scum conveying mechanism and transported out of the tank, completing the large-area scum removal. The first scraping mechanism then scrapes away the remaining scum in the sewage. During the scraping process, the scum retrieval mechanism retrieves and cleans impurities suspended in the liquid, making the scum removal work more efficient.

[0021] The scum conveying mechanism includes a motor III, a lifting plate I, a motor IV, a scraper trough, an auger, a sliding cover bracket, a sliding cover, and an electric actuator. Motor III is mounted on a support plate, and its output end is connected to a lead screw I. The lifting plate I is mounted on the lead screw I and is connected to it. Two sets of limiting columns I are located at the bottom of the support plate, and these columns are slidably connected to the lifting plate I. Two sets of scraper troughs are located at the bottom of the lifting plate I. Motor IV is located on one side of the scraper trough, and its output end is connected to an auger. The auger is entirely housed within the scraper trough. Multiple sets of sliding cover brackets are mounted on the scraper trough, and these brackets are slidably connected to the sliding cover. A half-gear is fixed to the sliding cover, meshing with a rack II. One end of the rack II has a... A push plate is connected to an electric push rod, which is fixed on a lifting plate I. Motor III controls the rotation of lead screw I, which drives the lifting plate I to rise and fall according to the height of the sewage in the tank. Motor IV controls the rotation of the auger to scrape the trough and collect the scum on the top of the sewage, which is then sent out by the auger. During the scum collection process, the electric push rod pulls the push plate backward, which drives rack II backward. Rack II meshes with a half gear, which drives the sliding cover to rotate backward. The sliding cover opens to collect the scum. During the scum conveying process, the electric push rod pushes the push plate forward, which drives rack II forward. Rack II meshes with a half gear, which drives the sliding cover to slide forward. The sliding cover closes to ensure that the scum does not leak out during the conveying process.

[0022] The walking mechanism includes motor V, a bracket, slide rail II, motor VI, limiting column II, and lifting plate II. Motor V is located at the front end of the bracket, and its output end is connected to two sets of gears III, which are also located inside the bracket. Gears III mesh with rack III, which is fixed to a support plate. Slide rail II is located on the outer side of rack III and is fixed to the support plate. Slide rail II is slidably connected to the bracket. Motor VI is located on one side of the bracket, and its output end is connected to a worm gear. The worm gear meshes with a worm wheel, which is rotatably connected to the bracket. A threaded rod is meshed in the center of the worm wheel. A threaded rod passes through the bracket and connects to the lifting plate II. A limiting column II is located at the other end of the bracket and is slidably connected to the bracket. The limiting column II passes through the bracket and connects to the lifting plate II. Motor V controls gear III to rotate. Gear III meshes with rack III. Rack III is fixed on the support plate. Gear III drives the bracket to move along rack III. Slide rail II limits the position of the bracket. Motor VI drives the worm to rotate. The worm meshes with the worm wheel. The worm wheel rotates. The threaded rod meshes with the center of the worm wheel. The rotation of the worm wheel drives the threaded rod to rise and fall. The rise and fall of the threaded rod drives the lifting plate II to rise and fall.

[0023] The scum removal mechanism includes a motor VII, a movable base, an angle stepper motor I, a winch reel, a tow line, and a net. The motor VII is located at one end of a limiting groove, which has two sets of components fixed to a lifting plate II. A lead screw II is located within the limiting groove and is connected to the movable base. An angle stepper motor I is mounted on the upper part of the movable base, and its output end is connected to a connecting plate I. A winch reel is mounted on the upper part of the connecting plate I, and the tow line is wound around it. The lower part of the tow line is connected to the net. The motor VII controls the lead screw. When screw II rotates, the lead screw II drives the moving seat to move, the moving seat drives the angle stepper motor I to move, the angle stepper motor I controls the rotation of the connecting plate I, the connecting plate I drives the twisted wheel to swing, the twisted wheel controls the winding and unwinding of the drag line, the drag line drives the lower net bag, and when the walking mechanism drives the scum removal mechanism to move to one side of the tank, the net bag removes and cleans the suspended impurities in the sewage, avoiding the problem that after scraping off the upper impurities in the sewage, there are still a lot of suspended impurities in the lower layer of the sewage, making the cleaning efficiency more efficient.

[0024] The adjustment mechanism includes a motor VIII, a limiting rod, a connecting rod, a motor IX, and a connecting shaft II. Motor VIII is mounted on the lifting plate II, and its output end is connected to connecting rod I. Connecting rods I, II, III, and IV are sequentially rotatably connected via pins. The limiting rod is rotatably connected to the lifting plate II and parallel to connecting rod IV. The limiting rod and connecting rod IV are rotatably connected via a connecting rod. Motor IX is mounted on the upper part of the connecting rod, and its output end is connected to the connecting shaft II. Motor VIII controls the rotation of connecting rod I. Connecting rod I drives connecting rod IV to swing via connecting rods II and III. Connecting rod IV drives the connecting rod to swing, and the connecting rod drives motor IX and connecting shaft II to swing. The limiting rod ensures the swing range of connecting rod IV.

[0025] The first scraping mechanism includes a positioning frame, a scraper I, an angle stepper motor II, a water spray pipe, and an angle stepper motor III. The first scraping mechanism is connected to an adjustment mechanism on one side of the water outlet. The positioning frame is fixed to the lower part of the connecting shaft II. The scraper I is disposed inside the positioning frame and rotatably connected to it. The angle stepper motor II is disposed at the upper front end of the positioning frame. The output end of the angle stepper motor II is connected to gear IV, which meshes with gear V. Gear V is connected to the scraper II. A waterproof cover IV is fixed to the front end of the positioning frame. The angle stepper motor II, gear IV, and gear V are all located inside the waterproof cover IV. The waterproof cover III is fixed. At the rear end of the positioning frame, angle stepper motor III is fixed inside waterproof cover III. The output end of angle stepper motor III is connected to gear VI, gear VI meshes with gear VII, gear VII is connected to a water spray pipe, the water spray pipe is rotatably connected to the positioning frame, and the water spray pipe is also connected to a water pipe; angle stepper motor II drives gear IV to rotate, gear IV meshes with gear V, gear V drives scraper I to rotate, and the tilt angle of scraper I can be adjusted as needed; angle stepper motor III drives gear VI to rotate, gear VI meshes with gear VII, gear VII drives the water spray pipe to rotate, and the water spray pipe rinses the surface of scraper I, cleaning the floating scum adhering to the surface of scraper I.

[0026] The second scraping mechanism includes scraper II, motor X, scraper III, reinforcing connecting rod, motor XI, screen plate I, screen plate II, angle stepper motor IV, scraper IV, and overflow plate. The second scraping mechanism is connected to an adjustment mechanism on one side of the inlet. Scraper II is fixed to the lower part of connecting shaft II, motor mounting bracket II is fixed to the upper part of scraper II, motor X is installed inside motor mounting bracket II, and the output end of motor X is connected to gear VIII. Gear VIII meshes with gear IX, gear IX is connected to scraper III, scraper III is rotatably connected to scraper II, and a reinforcing connecting rod is provided between scraper III and scraper II. Motor mounting bracket III is fixed to the upper part of scraper III, motor XI is installed inside motor mounting bracket III, and the output end of motor XI... Connecting gear X, gear X meshes with gear XI, gear XI connects to screen plate I, screen plate I is rotatably connected to scraper III, a fixed shaft is fixed at the lower end of scraper III, helical gear V is fixed on the fixed shaft, helical gear V meshes with helical gear VI, both helical gear V and helical gear VI are set inside waterproof cover V, waterproof cover V is fixed at the lower part of scraper III, helical gear VI connects to screen plate II, screen plate II is rotatably connected to screen plate I, scraper II and scraper III are each provided with two sets of fixed plates at the rear end, angle stepper motor IV is set on one side of the fixed plate, the output end of angle stepper motor IV is connected to connecting shaft III, connecting plate II is fixed on connecting shaft III, scraper IV is rotatably connected to the two sets of connecting plates II, and scraper IV is provided with overflow plate.

[0027] The advantages of this invention compared to existing technologies are as follows:

[0028] 1) The moving mechanism drives the aeration mechanism and the scum removal mechanism to move in opposite directions, enabling simultaneous aeration and scum removal on the other side, improving overall work efficiency. When the aeration mechanism blows gas into the sewage through the branch pipe, the air bubbles are dispersed by the spiral blades, further increasing the contact area between the gas and liquid and enhancing the aeration effect. The scum removal mechanism moves within the housing via the moving mechanism, and the adjusting mechanism adjusts the angle between the first and second scraping mechanisms. The first scraping mechanism adjusts the angle as needed. To adjust the tilt angle of scraper I, the water spray pipe rinses the surface of scraper I to clean the scum adhering to its surface. The second scraping mechanism controls the angle between scraper III and the screen plate through motors X and XI, so that the two sets of scrapers and the screen plate form an angle, improving the efficiency of scraping and cleaning scum. Scraper IV forms a height difference with scrapers II and III at the front end, scraping away the scum that scrapers II and III failed to remove. The overflow plate set on scraper IV blocks the passage of scum while ensuring water flow, further improving the scraping efficiency.

[0029] 2) The scum removal mechanism removes suspended impurities from the sewage, avoiding the problem of a large amount of suspended impurities remaining in the lower layer of the sewage after the upper impurities are scraped off, thus making the cleaning efficiency more efficient; the scum conveying mechanism raises and lowers to the appropriate position according to the sewage height in the tank, scrapes the scum from the upper part of the sewage to collect it, and then sends it out by the auger. During the scum collection process, the electric push rod pulls the push plate backward, the push plate drives the rack II backward, the rack II meshes with the half gear, the half gear drives the sliding cover to rotate backward, and the sliding cover opens to collect the scum. During the scum conveying process, the electric push rod pushes the push plate forward, the push plate drives the rack II forward, the rack II meshes with the half gear, the half gear drives the sliding cover to slide forward, and the sliding cover closes to ensure that the scum does not leak out during the conveying process;

[0030] 3) By controlling the angle between scraper III and the screen plate through motors X and XI, the two sets of scrapers and the screen plate form an angle, which improves the efficiency of scraping and cleaning scum. By controlling scraper IV to swing downward through angle stepper motor IV, scraper IV forms a height difference with scraper II and scraper III at the front end, and scrapes the scum that scraper II and scraper III failed to scrape again. The overflow plate set on scraper IV blocks the passage of scum while ensuring water flow, which further improves the scraping efficiency. While the second scraping mechanism moves forward, it scrapes the scum to one side. The scum conveying mechanism moves forward to collect the scraped scum and convey it out of the box, completing the scum cleaning work. Attached Figure Description

[0031] Appendix Figure 1 This is a schematic diagram of the structure of a biological nitrogen and phosphorus removal MBR wastewater treatment system according to the present invention. Figure 1 ;

[0032] Appendix Figure 2 This is a schematic diagram of the structure of a biological nitrogen and phosphorus removal MBR wastewater treatment system according to the present invention. Figure 2 ;

[0033] Appendix Figure 3 It is attached Figure 2 Schematic diagram of China Mobile's organizational structure;

[0034] Appendix Figure 4 It is attached Figure 2 Schematic diagram of the aeration mechanism;

[0035] Appendix Figure 5 It is attached Figure 2 Schematic diagram of the scum removal mechanism Figure 1 ;

[0036] Appendix Figure 6 It is attached Figure 5 Schematic diagram of the slag conveying mechanism;

[0037] Appendix Figure 7 It is attached Figure 5 Schematic diagram of the walking mechanism;

[0038] Appendix Figure 8 It is attached Figure 5 Schematic diagram of the slag removal mechanism;

[0039] Appendix Figure 9 It is attached Figure 5 Schematic diagram of the central adjustment mechanism;

[0040] Appendix Figure 10 It is attached Figure 5 Schematic diagram of the first scraping mechanism in the middle;

[0041] Appendix Figure 11 It is attached Figure 2 Schematic diagram of the scum removal mechanism Figure 2 ;

[0042] Appendix Figure 12 It is attached Figure 11 Schematic diagram of the second scraping mechanism Figure 1 ;

[0043] Appendix Figure 13 It is attached Figure 11 Schematic diagram of the second scraping mechanism Figure 2 ;

[0044] In the diagram: 11. Inlet; 12. Tank; 13. Moving mechanism; 14. Aeration mechanism; 15. Scum removal mechanism; 16. Protective cover I; 17. Outlet;

[0045] 101. Motor I; 102. Motor mounting bracket I; 103. Rocker arm; 104. Sliding shaft; 105. Slide plate; 106. Connecting block; 107. Rack I; 108. Gear I; 109. Positioning shaft I; 110. Slide rail I; 111. Connecting frame;

[0046] 201. Moving frame; 202. Motor II; 203. Drive shaft I; 204. Helical gear I; 205. Helical gear II; 206. Drive shaft II; 207. Helical gear III; 208. Helical gear IV; 209. Air supply pipe; 210. Connecting shaft I; 211. Branch pipe; 212. Spiral blade; 213. Support frame; 214. Waterproof cover I; 215. Waterproof cover II; 216. Protective cover II;

[0047] 301. Support plate; 302. Water pump; 303. Water pipe; 304. Scum conveying mechanism; 305. Traveling mechanism; 306. Scum removal mechanism; 307. First scraping mechanism; 308. Adjusting mechanism; 309. Second scraping mechanism;

[0048] 3101. Motor III; 3102. Lead Screw I; 3103. Limit Column I; 3104. Lifting Plate I; 3105. Motor IV; 3106. Scraper; 3107. Screw Conveyor; 3108. Sliding Cover Bracket; 3109. Sliding Cover; 3110. Half Gear; 3111. Rack II; 3112. Push Plate; 3113. Electric Actuator;

[0049] 3201, Motor V; 3202, Bracket; 3203, Gear III; 3204, Rack III; 3205, Slide Rail II; 3206, Motor VI; 3207, Worm Gear; 3208, Worm Wheel; 3209, Threaded Rod; 3210, Limiting Column II; 3211, Lifting Plate II;

[0050] 3301, Motor VII; 3302, Limiting Slide; 3303, Lead Screw II; 3304, Moving Base; 3305, Angle Stepper Motor I; 3306, Connecting Plate I; 3307, Stranded Wire Wheel; 3308, Trailing Cable; 3309, Net Bag;

[0051] 3401. Positioning frame; 3402. Scraper I; 3403. Angle stepper motor II; 3404. Gear IV; 3405. Gear V; 3406. Water spray pipe; 3407. Angle stepper motor III; 3408. Gear VI; 3409. Gear VII; 3410. Waterproof cover III; 3411. Waterproof cover IV;

[0052] 3501, Motor VIII; 3502, Connecting Rod I; 3503, Connecting Rod II; 3504, Connecting Rod III; 3505, Connecting Rod IV; 3506, Limiting Rod; 3507, Connecting Rod; 3508, Motor IX; 3509, Connecting Shaft II;

[0053] 3601, Scraper II; 3602, Motor Mounting Bracket II; 3603, Motor X; 3604, Gear VIII; 3605, Gear IX; 3606, Scraper III; 3607, Reinforcing Link; 3609, Motor Mounting Bracket III; 3610, Motor XI; 3611, Gear X; 3612, Gear XI; 3613, Mesh Plate I; 3614, Mesh Plate II; 3615, Waterproof Cover V; 3616, Fixed Shaft; 3617, Helical Gear V; 3618, Helical Gear VI; 3619, Angle Stepper Motor IV; 3620, Connecting Plate II; 3621, Connecting Shaft III; 3622, Scraper IV; 3623, Overflow Plate; 3624, Fixed Plate. Detailed Implementation

[0054] To facilitate understanding by those skilled in the art, the following is a detailed explanation in conjunction with the appendix. Figure 1-13 The technical solution of the present invention will be further described in detail below.

[0055] Example 1:

[0056] A biological nitrogen and phosphorus removal MBR wastewater treatment system includes a pretreatment tank, an anaerobic tank, an anoxic tank, an aerobic tank, and an MBR membrane tank; the system is provided with the pretreatment tank, anaerobic tank, anoxic tank, aerobic tank, and MBR membrane tank in sequence.

[0057] A biological nitrogen and phosphorus removal MBR wastewater treatment system has the following specific steps:

[0058] 1) Pretreatment tank: Large particles are filtered by setting a coarse screen with a gap of 35 mm, and fine suspended solids are filtered by setting a fine screen with a gap of 3 mm to prevent membrane entanglement and clogging of the equipment. The pH of the wastewater is controlled to 7 by adding HCl or NaOH. A low-speed submersible agitator is used with a stirring speed of 50 rpm to prevent sludge deposition.

[0059] 2) Anaerobic tank treatment: Ensure a hydraulic retention time (HRT) of 2 hours and a dissolved oxygen concentration of 0.17 mg / L to maintain a strictly anaerobic environment and prevent oxygen from entering. Maintain a sludge concentration of 4000 mg / L. Too high a concentration will cause the sludge to float, while too low a concentration will result in insufficient phosphorus release. Use low-speed mechanical stirring with a stirring speed of 30 rpm to prevent sludge sedimentation, but avoid excessive stirring to prevent the introduction of oxygen.

[0060] 3) Anoxic tank treatment: Ensure a hydraulic retention time (HRT) of 3 hours and a dissolved oxygen concentration of 0.3 mg / L to maintain a slightly anoxic environment. Use low-speed mechanical stirring with a stirring speed of 20 rpm to prevent the denitrification gas generated after sludge sedimentation from floating to the surface.

[0061] 4) Aerobic Tank Treatment: The hydraulic retention time (HRT) is maintained at 6 hours, and the dissolved oxygen concentration is maintained at 3 mg / L. Aeration is achieved in the aerobic tank through aeration mechanism 14. Motor II 202 drives drive shaft I 203 to rotate, which in turn drives helical gear I 204. Helical gear I 204 meshes with helical gear II 205, which in turn drives drive shaft II 206. Drive shaft II 206 drives helical gear III 207, which in turn meshes with helical gear IV 208. Helical gear IV 208 drives connecting shaft I 210 to rotate, which in turn drives branch pipe 211 and spiral blades 212 to rotate. When gas is blown into the wastewater through branch pipe 211, the bubbles are dispersed by spiral blades 212, further increasing the contact area between the gas and liquid and enhancing the aeration effect. The pore size on branch pipe 211 is ≤2 mm, increasing the oxygen utilization rate to 30%-40%. The operating cycle is 15 aeration cycles. Stop exposure for 5 minutes after the first minute;

[0062] The scum generated after aeration is cleaned by the scum cleaning mechanism 15. The walking mechanism 305 within the scum cleaning mechanism 15 controls the first scraping mechanism 307 and the second scraping mechanism 309 to scrape the scum. The motor V 3201 controlled by the walking mechanism 305 controls the rotation of gear III 3203. Gear III 3203 meshes with rack III 3204, which is fixed to the support plate 301. Gear III 3203 drives the bracket 3202 to move along rack III 3204. Motor VI 3206 drives the worm 3207 to rotate, which meshes with the worm wheel 3208, causing the worm wheel 3208 to rotate. The worm wheel 3208 has a threaded rod meshing at its center. 3209, the worm gear 3208 rotates to drive the threaded rod 3209 to rise and fall, the threaded rod 3209 rises and falls to drive the lifting plate II 3211 to rise and fall, the lifting plate II 3211 drives the adjusting mechanism 308 to move and rise and fall, the motor VIII 3501 of the adjusting mechanism 308 controls the connecting rod I 3502 to rotate, the connecting rod I 3502 drives the connecting rod IV 3505 to swing through the connecting rod II 3503 and the connecting rod III 3504, the connecting rod IV 3505 drives the connecting rod 3507 to swing, the connecting rod 3507 drives the motor IX 3508 and the connecting shaft II 3509 to swing, the connecting shaft II 3509 adjusts the position of the first scraping mechanism 307 and the second scraping mechanism 309;

[0063] The scum removal mechanism 306 on the first scraping mechanism 307 controls the rotation of the lead screw 2 3303 via motor VII 3301. The lead screw 2 3303 drives the moving seat 3304 to move, which in turn drives the angle stepper motor I 3305 to move. The angle stepper motor I 3305 controls the rotation of the connecting plate I 3306, which in turn drives the winch wheel 3307 to swing. The winch wheel 3307 controls the winding and unwinding of the drag line 3308, which in turn drives the lower net bag 3309, which is then moved by the traveling mechanism 30. When the scum removal mechanism 306 moves towards the side of the box 12, the net 3309 removes and cleans the suspended impurities in the sewage, avoiding the problem that a large number of suspended impurities remain in the lower layer of the sewage after the upper impurities are scraped off, making the cleaning efficiency more efficient; the angle stepper motor II 3403 of the first scraping mechanism 307 drives the gear IV 3404 to rotate, the gear IV 3404 meshes with the gear V 3405, and the gear V 3405 drives the scraper I 3402 to rotate, adjusting the tilt angle of the scraper I 3402 as needed;

[0064] The motors X3603 and XI3610 of the second scraping mechanism 309 control the angle between scraper III3606 and the screen, so that the two sets of scrapers and the screen form an angle, improving the efficiency of scraping and cleaning scum. The angle stepper motor IV3619 controls scraper IV3622 to swing downward, and scraper IV3622 forms a height difference with scraper II3601 and scraper III3606 at the front end, so that the scum that scraper II3601 and scraper III3606 could not scrape off can be scraped off again. The overflow plate 3623 set on scraper IV3622 blocks the passage of scum while ensuring the passage of water, further improving the scraping efficiency. The first scraping mechanism 307 and the second scraping mechanism 309 scrape the floating scum in the sewage at a speed of 40 rpm for 40 minutes to the scum conveying mechanism 304.

[0065] Motor III 3101 of the scum conveying mechanism 304 controls the rotation of lead screw I 3102, which in turn drives the lifting plate I 3104 to rise and fall according to the height of the sewage in the tank 12. Motor IV 3105 controls the rotation of the auger 3107, and the scraper 3106 collects the scum from the top of the sewage, which is then conveyed out by the auger 3107. During the scum collection process, the electric push rod 3113 pulls the push plate 3112 backward, which in turn drives the rack II 3111 backward. 111 meshes with half gear 3110, half gear 3110 drives sliding cover 3109 to rotate backward, sliding cover 3109 opens to collect scum, during the process of conveying scum, electric push rod 3113 pushes push plate 3112 forward, push plate 3112 drives rack II 3111 forward, rack II 3111 meshes with half gear 3110, half gear 3110 drives sliding cover 3109 to slide forward, sliding cover 3109 closes to ensure that scum does not leak out during the conveying process, completing the cleaning of large area of ​​scum;

[0066] 5) MBR membrane treatment tank: The microfiltration membrane with a pore size of 0.05μm thoroughly removes suspended solids and bacteria and degrades residual organic matter. The membrane flux is set to 20 L / (m²·h), the aeration intensity is set to 0.4Nm³ / (m²·h), and the suction time is 2 min intervals every 10 min. UV disinfection is first performed at a dosage of 35 mJ / cm², followed by the addition of sodium hypochlorite at a dosage of 8 mg / L to complete the wastewater treatment process.

[0067] The aerobic tank described in step 4) includes an inlet 11, a tank 12, a moving mechanism 13, an aeration mechanism 14, a scum cleaning mechanism 15, a protective cover I 16, and an outlet 17. The inlet 11 is located at the front end of the tank 12, the outlet 17 is located at the rear end of the tank 12, the moving mechanism 13 is located on one side of the tank 12, the protective cover I 16 is fixed to both sides of the tank 12, and the moving mechanism 13 is located inside the protective cover I 16. The tank 12 contains the scum cleaning mechanism 15 and the aeration mechanism 14. The scum cleaning mechanism 15 is located within the tank. Inside the upper layer of the body 12, the aeration mechanism 14 is located inside the lower layer of the body 12. Both the scum cleaning mechanism 15 and the aeration mechanism 14 are connected to the moving mechanism 13. Wastewater enters the body 12 through the inlet 11. The moving mechanism 13 drives the aeration mechanism 14 and the scum cleaning mechanism 15 to move. The aeration mechanism 14 aerates the wastewater inside the body 12. After aeration, the scum rises and is then cleaned by the scum cleaning mechanism 15. After the scum is cleaned, the wastewater enters the next treatment process through the outlet 17.

[0068] The moving mechanism 13 includes a motor I 101, a motor mounting bracket I 102, a rocker arm 103, a sliding shaft 104, a slide plate 105, and a connecting frame 111. The motor I 101 is mounted on the motor mounting bracket I 102, which is fixed to the outside of the housing 12. The output end of the motor I 101 is connected to one end of the rocker arm 103, and the other end of the rocker arm 103 is provided with a sliding shaft 104. The sliding shaft 104 is also disposed in the slide plate 105, and the sliding shaft 104 is slidably connected to the slide plate 105. The slide plate 105 is fixedly connected to a connecting block 106, and the connecting block 106 is fixedly connected to a rack I 107 on the lower side. The rack I 107 is disposed in the slide rail I 110, which is fixed to the outside of the housing 12. A connecting frame 111 is fixed to the other side of the rack I 107. The connecting frame 111 is located inside the housing 12. The upper and lower sets of racks I107 simultaneously mesh with gears I108. Gears I108 are rotatably connected to positioning shafts I109, which are fixed to the outside of the housing 12. The motor I101 controls the rocker arm 103 to rotate. The rocker arm 103 drives the sliding shaft 104 to slide within the slide plate 105. While sliding, the slide plate 105 moves. The slide plate 105 drives the lower rack I107 to move through the connecting block 106. The upper and lower sets of racks I107 simultaneously mesh with gears I108. Gears I108 drive the upper and lower sets of racks I107 to move relative to each other. The racks I107 drive the connecting frame 111 to move. The connecting frame 111 drives the aeration mechanism 14 and the scum cleaning mechanism 15 to move.

[0069] The aeration mechanism 14 includes a movable frame 201, a motor II 202, an air supply pipe 209, a connecting shaft I 210, a branch pipe 211, a spiral blade 212, and a support frame 213. The movable frame 201 is fixedly connected to the connecting frame 111. The motor II 202 is mounted on the movable frame 201, and its output end is connected to the transmission shaft I 203. A helical gear I 204 is mounted on the transmission shaft I 203, and the helical gear I 204 meshes with the helical gear II 205. The motor II 202 and the transmission shaft... Helical gears I203, I204, and II205 are all housed inside the waterproof cover I214. Helical gear II205 is located at one end of the drive shaft II206, and helical gear III207 is located at the other end of the drive shaft II206. Helical gear III207 meshes with helical gear IV208. Helical gears III207 and IV208 are housed inside the waterproof cover II215. Helical gear IV208 is located on the connecting shaft I210, which is located on the upper part of the air supply pipe 209. The connecting shaft also has a branch air supply pipe. Pipe 211 and spiral blade 212 are both housed within support frame 213, which is rotatably connected to the support frame 213. Support frame 213 is fixed within protective cover II 216, which is fixed to movable frame 201. Drive shaft II 206 passes through and is rotatably connected to protective cover II 216. Motor II 202 drives drive shaft I 203 to rotate, which in turn drives helical gear I 204 to rotate. Helical gear II 205 meshes with helical gear II 205, which drives transmission shaft II 206 to rotate. Transmission shaft II 206 drives helical gear III 207, which meshes with helical gear IV 208. Helical gear IV 208 drives connecting shaft I 210 to rotate. Connecting shaft I 210 drives branch pipe 211 and spiral blade 212 to rotate. When gas is blown into the sewage through branch pipe 211, the bubbles are dispersed by spiral blade 212, further increasing the contact area between gas and liquid and enhancing the aeration effect.

[0070] The scum removal mechanism 15 includes a support plate 301, a water pump 302, a water pipe 303, a scum conveying mechanism 304, a traveling mechanism 305, a scum retrieval mechanism 306, a first scraping mechanism 307, an adjusting mechanism 308, and a second scraping mechanism 309. The support plate 301 is fixedly connected to the connecting frame 111. The water pump 302 is fixed to the upper part of the support plate 301 and connected to the water pipe 303. The scum conveying mechanism 304 is provided at the lower part of the support plate 301. Two sets of traveling mechanisms 305 are provided on both sides of the support plate 301. The adjusting mechanism 308 is provided at the lower part of the traveling mechanism 305. The two sets of adjusting mechanisms 308 are respectively connected to the second scraping mechanism. The first scraping mechanism 309 and the first scum removal mechanism 307 are located on the upper part of the first scraping mechanism 307. The moving mechanism 13 drives the scum removal mechanism 15 to move as a whole within the housing 12. The adjusting mechanism 308 adjusts the angle of the second scraping mechanism 309. The second scraping mechanism 309 scrapes the large area of ​​scum on the upper part of the sewage to one side. The scraped scum is collected by the scum conveying mechanism 304 and conveyed out of the housing 12, completing the cleaning of a large area of ​​scum. The first scraping mechanism 307 scrapes the remaining scum in the sewage again. During the scraping process, the scum removal mechanism 306 removes impurities suspended in the liquid, making the scum cleaning work more efficient.

[0071] The scum conveying mechanism 304 includes a motor III 3101, a lifting plate I 3104, a motor IV 3105, a scraper 3106, an auger 3107, a sliding cover bracket 3108, a sliding cover 3109, and an electric actuator 3113. Motor III 3101 is mounted on the support plate 301, and its output end is connected to a lead screw I 3102. The lifting plate I 3104 is mounted on the lead screw I 3102 and is connected to the lead screw I 3102. Two sets of limiting columns I 3103 are provided at the lower part of the support plate 301. The limiting column I 3103 is slidably connected to the lifting plate I 3104. The lower part of the lifting plate I 3104 is provided with two sets of scraper grooves 3106. The motor IV 3105 is set on one side of the scraper groove 3106. The output end of the motor IV 3105 is connected to the auger 3107. The auger 3107 is set entirely in the scraper groove 3106. Multiple sets of sliding cover brackets 3108 are provided on the scraper groove 3106. The sliding cover brackets 3108 are slidably connected to the sliding cover 3109. A half gear 3110 is fixed on the sliding cover 3109. The half gear 3110 meshes with the rack II 3111. One end of rack II 3111 is equipped with a push plate 3112, which is connected to an electric push rod 3113. The electric push rod 3113 is fixed on the lifting plate I 3104. Motor III 3101 controls the lead screw I 3102 to rotate, and the lead screw I 3102 drives the lifting plate I 3104 to rise and fall according to the height of the sewage in the tank 12. Motor IV 3105 controls the auger 3107 to rotate, and the scraper 3106 collects the scum on the top of the sewage, which is then sent out by the auger 3107. During the scum collection process, the electric push rod 3113 is pulled backward. Plate 3112 pushes the rack II 3111 backward, which meshes with half gear 3110. Half gear 3110 drives the sliding cover 3109 to rotate backward, opening the sliding cover 3109 to collect scum. During the scum conveying process, electric push rod 3113 pushes the push plate 3112 forward, which in turn drives the rack II 3111 forward. The rack II 3111 meshes with half gear 3110, which drives the sliding cover 3109 to slide forward. The sliding cover 3109 closes to ensure that the scum does not leak during the conveying process.

[0072] The walking mechanism 305 includes a motor V 3201, a bracket 3202, a slide rail II 3205, a motor VI 3206, a limiting column II 3210, and a lifting plate II 3211. Motor V 3201 is located at the front end of the bracket 3202. The output end of motor V 3201 is connected to two sets of gears III 3203, which are also located within the bracket 3202. Gears III 3203 mesh with rack III 3204, which is fixed to the support plate 3. On rack 3204, a slide rail 3205 is provided on the outer side of rack 3204. The slide rail 3205 is fixed on the support plate 301 and is slidably connected to the bracket 3202. Motor VI 3206 is located on one side of the bracket 3202. The output end of motor VI 3206 is connected to worm gear 3207. Worm gear 3207 meshes with worm wheel 3208. Worm wheel 3208 is rotatably connected to the bracket 3202. A threaded rod 3209 is meshed with the center of worm wheel 3208. The threaded rod 3209 passes through the bracket 3202 and connects to the lifting plate II 3211. The limiting column II 3210 is located at the other end of the bracket 3202 and is slidably connected to the bracket 3202. The limiting column II 3210 passes through the bracket 3202 and connects to the lifting plate II 3211. The motor V 3201 controls the gear III 3203 to rotate. The gear III 3203 meshes with the rack III 3204. The rack III 3204 is fixed on the support plate 301. Wheel Ⅲ3203 drives bracket 3202 to move along rack Ⅲ3204. Slide rail Ⅱ3205 limits the position of bracket 3202. Motor Ⅵ3206 drives worm 3207 to rotate. Worm 3207 meshes with worm wheel 3208. Worm wheel 3208 rotates. The center of worm wheel 3208 meshes with threaded rod 3209. The rotation of worm wheel 3208 drives threaded rod 3209 to rise and fall. The rise and fall of threaded rod 3209 drives lifting plate Ⅱ3211 to rise and fall.

[0073] The scum removal mechanism 306 includes a motor VII 3301, a movable base 3304, an angle stepper motor I 3305, a winch 3307, a tow line 3308, and a net 3309. The motor VII 3301 is located at one end of a limiting slide groove 3302. Two sets of the limiting slide groove 3302 are fixed to a lifting plate II 3211. A lead screw II 3303 is located within the limiting slide groove 3302 and is connected to the movable base 3304. An angle stepper motor I 3305 is located on the upper part of the movable base 3304. The output end of the angle stepper motor I 3305 is connected to a connecting plate I 3306. A winch 3307 is located on the upper part of the connecting plate I 3306. The tow line 3308 is wound around the winch 3307. The lower part of the tow line 3308... The net 3309 is connected; motor VII 3301 controls the rotation of lead screw II 3303, lead screw II 3303 drives the moving seat 3304 to move, moving seat 3304 drives the angle stepper motor I 3305 to move, angle stepper motor I 3305 controls the rotation of connecting plate I 3306, connecting plate I 3306 drives the twisted wheel 3307 to swing, twisted wheel 3307 controls the winding and unwinding of the tow line 3308, tow line 3308 drives the lower net 3309, and when the walking mechanism 305 drives the scum removal mechanism 306 to move towards one side of the box 12, the net 3309 removes and cleans the suspended impurities in the sewage, avoiding the problem that after scraping off the upper impurities in the sewage, there are still a lot of suspended impurities in the lower layer of the sewage, making the cleaning efficiency more efficient.

[0074] The adjusting mechanism 308 includes a motor VIII 3501, a limiting rod 3506, a connecting rod 3507, a motor IX 3508, and a connecting shaft II 3509. Motor VIII 3501 is mounted on the lifting plate II 3211. The output end of motor VIII 3501 is connected to connecting rod I 3502. Connecting rods I 3502, II 3503, III 3504, and IV 3505 are sequentially rotatably connected via pins. The limiting rod 3506 is rotatably connected to the lifting plate II 3211. The limiting rod 3506 and connecting rod IV 3505 are parallel to each other. The rods IV 3505 are rotatably connected by a connecting rod 3507. A motor IX 3508 is installed on the upper part of the connecting rod 3507. The output end of the motor IX 3508 is connected to the connecting shaft II 3509. The motor VIII 3501 controls the rotation of the connecting rod I 3502. The connecting rod I 3502 drives the connecting rod IV 3505 to swing through the connecting rods II 3503 and III 3504. The connecting rod IV 3505 drives the connecting rod 3507 to swing. The connecting rod 3507 drives the motor IX 3508 and the connecting shaft II 3509 to swing. The limiting rod 3506 ensures the swing range of the connecting rod IV 3505.

[0075] The first scraping mechanism 307 includes a positioning frame 3401, a scraper I 3402, an angle stepper motor II 3403, a water spray pipe 3406, and an angle stepper motor III 3407. The first scraping mechanism 307 is connected to an adjustment mechanism 308 on one side of the water outlet 17. The positioning frame 3401 is fixed to the lower part of the connecting shaft II 3509. The scraper I 3402 is disposed inside the positioning frame 3401 and rotatably connected to the positioning frame 3401. The angle stepper motor II... 3403 is located at the upper front end of the positioning frame 3401. The output end of the angle stepper motor II 3403 is connected to gear IV 3404. Gear IV 3404 meshes with gear V 3405. Gear V 3405 is connected to scraper II 3601. Waterproof cover IV 3411 is fixed to the front end of the positioning frame 3401. The angle stepper motor II 3403, gear IV 3404, and gear V 3405 are all located inside waterproof cover IV 3411. Waterproof cover III 3410 is fixed to the positioning frame 3401. At the rear end of the positioning frame 3401, angle stepper motor III 3407 is fixed inside the waterproof cover III 3410. The output end of angle stepper motor III 3407 is connected to gear VI 3408, which meshes with gear VII 3409. Gear VII 3409 is connected to water spray pipe 3406, which is rotatably connected to the positioning frame 3401. Water spray pipe 3406 is also connected to water pipe 303. Angle stepper motor II 3403 drives gear IV 3404 to rotate. Gear IV 3404 meshes with gear V 3405, which drives scraper I 3402 to rotate. The tilt angle of scraper I 3402 can be adjusted as needed. Angle stepper motor III 3407 drives gear VI 3408 to rotate, which meshes with gear VII 3409. Gear VII 3409 drives water spray pipe 3406 to rotate, which washes the surface of scraper I 3402 and removes the scum adhering to the surface of scraper I 3402.

[0076] The second scraping mechanism 309 includes scraper II 3601, motor X 3603, scraper III 3606, reinforcing connecting rod 3607, motor XI 3610, mesh plate I 3613, mesh plate II 3614, angle stepper motor IV 3619, scraper IV 3622, and overflow plate 3623; the second scraping mechanism 309 is connected to the adjustment mechanism 308 on one side of the inlet 11, scraper II 3601 is fixed to the lower part of connecting shaft II 3509, motor mounting bracket II 3602 is fixed to the upper part of scraper II 3601, and motor X... Motor X 3603 is installed inside motor mounting bracket II 3602. The output end of motor X 3603 is connected to gear VIII 3604. Gear VIII 3604 meshes with gear IX 3605. Gear IX 3605 is connected to scraper III 3606. Scraper III 3606 is rotatably connected to scraper II 3601. A reinforcing connecting rod 3607 is provided between scraper III 3606 and scraper II 3601. Motor mounting bracket III 3609 is fixed on the upper part of scraper III 3606. Motor XI 3610 is installed inside motor mounting bracket III 3609. The output end of motor XI 3610 is connected to... Gear X3611 meshes with gear XI3612. Gear XI3612 connects to mesh plate I3613. Mesh plate I3613 is rotatably connected to scraper III3606. A fixed shaft 3616 is fixed to the lower end of scraper III3606. Helical gear V3617 is fixed on the fixed shaft 3616. Helical gear V3617 meshes with helical gear VI3618. Both helical gears V3617 and VI3618 are housed within a waterproof cover V3615. The waterproof cover V3615 is fixed to the lower part of scraper III3606. Wheel VI 3618 is connected to mesh plate II 3614. Mesh plate II 3614 is rotatably connected to mesh plate I 3613. Scraper II 3601 and scraper III 3606 are each provided with two sets of fixing plates 3624 at their rear ends. Angle stepper motor IV 3619 is set on one side of fixing plate 3624. The output end of angle stepper motor IV 3619 is connected to connecting shaft III 3621. Connecting plate II 3620 is fixed on connecting shaft III 3621. Scraper IV 3622 is rotatably connected to the two sets of connecting plates II 3620. Scraper IV 3622 is provided with overflow plate 3623.

[0077] Motor X3603 controls gear VIII3604 to rotate. Gear VIII3604 meshes with gear IX3605. The rotation of gear IX3605 drives scraper III3606 to adjust its angle. Motor XI3610 controls gear X3611 to rotate. Gear X3611 meshes with gear XI3612. The rotation of gear XI3612 drives screen I3613 to rotate. Simultaneously, the rotation of screen I3613 drives the rotation of screen II3614. The rotation of 614 drives the rotation of helical gear VI3618, which meshes with helical gear V3617. Helical gear V3617 is fixed under the fixed shaft 3616. Helical gear VI3618 rotates along helical gear V3617. The rotation generated by helical gear VI3618 itself drives the mesh plate II3614 to rotate downward and open. Angle stepper motor IV3619 controls the rotation of connecting shaft III3621, which drives the mesh plate II3614 to rotate downward and open. The connecting plate II 3620 rotates, causing the scraper IV 3622 to swing. The angle between the scraper III 3606 and the screen is controlled by the motors X 3603 and XI 3610, so that the two sets of scrapers and the screen form an angle, improving the efficiency of scraping and cleaning scum. The angle stepper motor IV 3619 controls the scraper IV 3622 to swing downward, forming a height difference between the scraper IV 3622 and the front scraper II 3601 and scraper III 3606, which scrapes away the scum that the scraper II 3601 and scraper III 3606 could not remove. The overflow plate 3623 set on the scraper IV 3622 blocks the scum from passing through while ensuring the water flow, further improving the scraping efficiency. The second scraping mechanism 309 moves forward and scrapes the scum to one side. The scum conveying mechanism 304 collects the scraped scum and conveys it out of the box 12, completing the scum cleaning work.

[0078] Example 2:

[0079] The difference from Example 1 is:

[0080] 1) Pretreatment tank: The coarse screen is set with a mesh size of 20mm, the fine screen with a mesh size of 1mm, and the pH of the wastewater is controlled at 6.5;

[0081] 2) Anaerobic treatment: Hydraulic retention time (HRT) is 1 hour, dissolved oxygen concentration is 0.15 mg / L, and sludge concentration is maintained at 3000 mg / L;

[0082] 3) Anoxic tank treatment: hydraulic retention time (HRT) is 2 hours, dissolved oxygen concentration is 0.3 mg / L, and mechanical stirring speed is set to 15 rpm;

[0083] 4) Aerobic tank treatment: The hydraulic retention time (HRT) is 4 hours and the dissolved oxygen concentration is 2 mg / L. While the sewage is being aerated repeatedly, the floating scum in the sewage is scraped off repeatedly at a speed of 25 rpm for 35 minutes.

[0084] 5) MBR membrane tank treatment: The filter membrane pore size is 0.01μm, the membrane flux is set to 15L / (m²·h), the aeration intensity is set to 0.3Nm³ / (m²·h), the suction time is every 8 min with a 2 min pause, UV disinfection is used first with a dosage of 30 mJ / cm², and then sodium hypochlorite is added at a dosage of 5mg / L;

[0085] The remaining operating steps and values ​​are the same as in Example 1, and will not be repeated here.

[0086] Example 3:

[0087] The difference from Example 1 is:

[0088] 1) Pretreatment: The coarse screen aperture is set to 50mm, the fine screen aperture is set to 5mm, and the wastewater pH is controlled at 8.5;

[0089] 2) Anaerobic treatment: Hydraulic retention time (HRT) is 3 hours, dissolved oxygen concentration is 0.2 mg / L, and sludge concentration is maintained at 5000 mg / L;

[0090] 3) Anoxic tank treatment: hydraulic retention time (HRT) is 4 hours, dissolved oxygen concentration is 0.5 mg / L, and mechanical stirring speed is set to 10 rpm;

[0091] 4) Aerobic tank treatment: The hydraulic retention time (HRT) is 8 hours and the dissolved oxygen concentration is 4 mg / L. While the sewage is being aerated repeatedly, the floating scum in the sewage is scraped off repeatedly at a speed of 60 rpm for 50 minutes.

[0092] 5) MBR membrane tank treatment: The filter membrane pore size is 0.4μm, the membrane flux is set to 25L / (m²·h), the aeration intensity is set to 0.5Nm³ / (m²·h), the suction time is every 12 min with a 3 min pause, UV disinfection is used first with a dosage of 40 mJ / cm², and then sodium hypochlorite is added at a dosage of 10mg / L;

[0093] The remaining operating steps and values ​​are the same as in Example 1, and will not be repeated here.

[0094] Comparative Example 1:

[0095] The difference from Example 1 is that the aeration mechanism is no longer controlled to treat the wastewater during step 4).

[0096] Comparative Example 2:

[0097] The difference from Example 1 is that the scum removal mechanism is no longer controlled to treat the sewage during step 4).

[0098] Comparative Example 3:

[0099] The difference from Example 1 is that the aeration mechanism and the scum removal mechanism are no longer controlled to treat the sewage during step 4).

[0100] The test results of the wastewater treated by the above examples and comparative examples are shown in Table 1.

[0101] Suspended matter mg / L pH value oil mg / L Phosphorus content (mg / L) Nitrogen content (mg / L) Example 1 4 7.2 0.3 0.3 5 Example 2 3 7.0 0.2 0.2 6 Example 3 5 6.9 0.4 0.5 8 Comparative Example 1 16 8.0 0.9 1.2 14 Comparative Example 2 14 7.8 0.7 1.0 11 Comparative Example 3 20 8.0 1.2 1.4 18

[0102] By comparing the data of Examples 1-3 with Comparative Example 3, it can be seen that the wastewater can be treated better by using an aeration mechanism and a scum removal mechanism.

[0103] As can be seen from the data in Examples 1-3 and Comparative Examples 1, 2, and 3 in Table 1, the wastewater from environmental engineering can meet the recycling standards stipulated in the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB 18918-2002) after being treated by the process and device provided by this invention.

[0104] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to 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 of this invention.

[0105] In summary, the electronic or electrical components, including but not limited to motors, electric actuators, and angle stepper motors, are existing components that are custom-made or purchased. The electrical connections between these components are conventional circuit or electrical connections in the prior art and are not within the scope of protection of this invention.

[0106] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A biological denitrification and phosphorus removal MBR sewage treatment system, comprising a pretreatment tank, an anaerobic tank, an anoxic tank, an aerobic tank, and an MBR membrane tank; the system is sequentially provided with a pretreatment tank, an anaerobic tank, an anoxic tank, an aerobic tank, and an MBR membrane tank, characterized in that The aerobic tank comprises a water inlet, a box body, a moving mechanism, an aeration mechanism, a dross cleaning mechanism, a protective cover I and a water outlet; the water inlet is arranged at the front end of the box body, the water outlet is arranged at the rear end of the box body, the moving mechanism is arranged at one side of the box body, the protective cover I is fixed at both sides of the box body, the moving mechanism is arranged in the protective cover I, the dross cleaning mechanism and the aeration mechanism are arranged in the box body, the dross cleaning mechanism is arranged at the upper layer in the box body, the aeration mechanism is arranged at the lower layer in the box body, and the dross cleaning mechanism and the aeration mechanism are connected with the moving mechanism; The dross cleaning mechanism comprises a support plate, a water pump, a water pipe, a dross conveying mechanism, a walking mechanism, a dross salvaging mechanism, a first scraping mechanism, an adjusting mechanism and a second scraping mechanism; the support plate is fixedly connected with the connecting frame, the water pump is fixed on the upper portion of the support plate, the water pump is connected with the water pipe, the lower portion of the support plate is provided with the dross conveying mechanism, two groups of walking mechanisms are arranged at the two sides of the support plate, the lower portion of each walking mechanism is provided with the adjusting mechanism, the two groups of adjusting mechanisms are respectively connected with the second scraping mechanism and the first scraping mechanism, and the dross salvaging mechanism is arranged on the upper portion of the first scraping mechanism; The second scraping mechanism comprises a scraper II, a motor X, a scraper III, a reinforcing connecting rod, a motor XI, a mesh plate I, a mesh plate II, an angle stepping motor IV, a scraper IV and an overflow plate; the second scraping mechanism is connected with the adjusting mechanism on one side of the water inlet, the scraper II is fixed on the lower portion of the connecting shaft II, the motor mounting frame II is fixed on the upper portion of the scraper II, the motor X is arranged in the motor mounting frame II, the output end of the motor X is connected with the gear VIII, the gear VIII is engaged with the gear IX, the gear IX is connected with the scraper III, the scraper III is rotatably connected with the scraper II, the reinforcing connecting rod is arranged between the scraper III and the scraper II, the motor mounting frame III is fixed on the upper portion of the scraper III, the motor XI is arranged in the motor mounting frame III, the output end of the motor XI is connected with the gear X, the gear X is engaged with the gear XI, the gear XI is connected with the mesh plate I, the mesh plate I is rotatably connected with the scraper III, the lower end of the scraper III is fixed with a fixed shaft, the fixed shaft is fixed with the helical gear V, the helical gear V is engaged with the helical gear VI, the helical gear V and the helical gear VI are arranged in the waterproof cover V, the waterproof cover V is fixed on the lower portion of the scraper III, the helical gear VI is connected with the mesh plate II, the mesh plate II is rotatably connected with the mesh plate I, the rear ends of the scraper II and the scraper III are provided with two groups of fixed plates, the angle stepping motor IV is arranged on one side of the fixed plate, the output end of the angle stepping motor IV is connected with the connecting shaft III, the connecting plate II is fixed on the connecting shaft III, the scraper IV is rotatably connected with the two groups of connecting plates II, and the overflow plate is arranged on the scraper IV. The first scraping mechanism comprises a positioning frame, a scraper I, an angle stepping motor II, a water spraying pipe, and an angle stepping motor III; the first scraping mechanism is connected with the adjusting mechanism on the side of the water outlet, the positioning frame is fixed on the lower part of the connecting shaft II, the scraper I is arranged in the positioning frame and is rotationally connected with the positioning frame, the angle stepping motor II is arranged on the upper front end of the positioning frame, the output end of the angle stepping motor II is connected with a gear IV, the gear IV is engaged with a gear V, the gear V is connected with the scraper II, a waterproof cover IV is fixed on the front end of the positioning frame, the angle stepping motor II, the gear IV and the gear V are located in the waterproof cover IV, a waterproof cover III is fixed on the rear end of the positioning frame, the angle stepping motor III is fixed in the waterproof cover III, the output end of the angle stepping motor III is connected with a gear VI, the gear VI is engaged with a gear VII, the gear VII is connected with the water spraying pipe, and the water spraying pipe is rotationally connected with the positioning frame and is connected with a water pipe at the same time; The scum fishing mechanism comprises a motor VII, a moving seat, an angle stepping motor I, a wire twisting wheel, a wire, and a net bag; the motor VII is arranged on one end of a limiting sliding groove, the limiting sliding groove is provided with two groups of fixed rods arranged on the lifting plate II, a lead screw II is arranged in the limiting sliding groove, the lead screw II is connected with the moving seat in a matched mode, the moving seat is provided with the angle stepping motor I on the upper part, the output end of the angle stepping motor I is connected with a connecting plate I, the connecting plate I is provided with the wire twisting wheel on the upper part, the wire is wound on the wire twisting wheel, and the wire is connected with the net bag on the lower part; The adjusting mechanism comprises a motor VIII, a limiting rod, a connecting rod, a motor IX, and a connecting shaft II; the motor VIII is arranged on the lifting plate II, the output end of the motor VIII is connected with a connecting rod I, the connecting rod I, a connecting rod II, a connecting rod III, and a connecting rod IV are rotationally connected in sequence through pins, the limiting rod is rotationally connected with the lifting plate II, the limiting rod and the connecting rod IV are parallel to each other, the limiting rod and the connecting rod IV are rotationally connected through the connecting rod, the connecting rod is provided with the motor IX on the upper part, and the output end of the motor IX is connected with the connecting shaft II.

2. The biological denitrification and dephosphorization MBR sewage treatment system according to claim 1, characterized in that The moving mechanism comprises a motor I, a motor mounting frame I, a rocker arm, a sliding shaft, a sliding groove plate, and a connecting frame; the motor I is mounted on the motor mounting frame I, the motor mounting frame I is fixed on the outside of the box body, the output end of the motor I is connected with one end of the rocker arm, the other end of the rocker arm is provided with the sliding shaft, the sliding shaft is arranged in the sliding groove plate at the same time, the sliding shaft is connected with the sliding groove plate in a sliding mode, the sliding groove plate is fixedly connected with a connecting block, the connecting block is fixedly connected with the rack I on the lower side, the rack I is arranged in the sliding rail I, the sliding rail I is fixed on the outside of the box body, the rack I is fixedly provided with the connecting frame on the other side, the connecting frame is arranged in the box body, and the two groups of rack I are engaged with the gear I at the same time.

3. The biological denitrification and dephosphorization MBR sewage treatment system according to claim 1, characterized in that The aeration mechanism comprises a moving frame, a motor II, a gas conveying pipe, a connecting shaft I, a branch gas pipe, a spiral blade and a support frame; the moving frame is fixedly connected with a connecting frame, the motor II is arranged on the moving frame, the motor II is connected with a transmission shaft I at the output end, a helical gear I is arranged on the transmission shaft I, the helical gear I is engaged with a helical gear II, the motor II, the transmission shaft I, the helical gear I and the helical gear II are arranged inside a waterproof cover I, the helical gear II is arranged at one end of a transmission shaft II, a helical gear III is arranged at the other end of the transmission shaft II, the helical gear III is engaged with a helical gear IV, the helical gear III and the helical gear IV are arranged inside a waterproof cover II, the helical gear IV is arranged on the connecting shaft I, the connecting shaft is arranged on the upper part of the gas conveying pipe, the connecting shaft is also provided with the branch gas pipe and the spiral blade, the spiral blade is arranged in the support frame, the spiral blade is rotatably connected with the support frame, the support frame is fixed in the waterproof cover II, the waterproof cover II is fixed on the moving frame, the transmission shaft II penetrates through the waterproof cover II and is rotatably connected with the waterproof cover II.

4. The biological denitrification and dephosphorization MBR sewage treatment system according to claim 1, characterized in that The scum conveying mechanism comprises a motor III, a lifting plate I, a motor IV, a scraping groove, an auger, a sliding cover support, a sliding cover and an electric push rod; the motor III is arranged on a support plate, the motor III is connected with a lead screw I at the output end, the lifting plate I is arranged on the lead screw I, the lifting plate I is connected with the lead screw I in a matched mode, the lower part of the support plate is provided with two groups of limiting vertical columns I, the limiting vertical columns I are slidably connected with the lifting plate I, the lower part of the lifting plate I is provided with two groups of scraping grooves, the motor IV is arranged on one side of the scraping groove, the motor IV is connected with the auger at the output end, the auger is arranged in the scraping groove, a plurality of sliding cover supports are arranged on the scraping groove, the sliding cover supports are slidably connected with the sliding cover, the sliding cover is fixed with a half gear, the half gear is engaged with a rack II, one end of the rack II is provided with a push plate, the push plate is connected with the electric push rod, and the electric push rod is fixed on the lifting plate I; The walking mechanism comprises a motor V, a support, a sliding rail II, a motor VI, a limiting vertical column II and a lifting plate II; the motor V is arranged at the front end of the support, the motor V is connected with two groups of gears III at the output end, the gears III are arranged in the support, the gears III are engaged with a rack III, the rack III is fixed on a support plate, the outer side of the rack III is provided with the sliding rail II, the sliding rail II is fixed on the support plate, the sliding rail II is slidably connected with the support, the motor VI is arranged on one side of the support, the motor VI is connected with a worm at the output end, the worm is engaged with a worm wheel, the worm wheel is rotatably connected with the support, a threaded rod is arranged in the worm wheel in a meshing mode, the threaded rod penetrates through the support and connects the lifting plate II, the limiting vertical column II is arranged at the other end of the support, the limiting vertical column II is slidably connected with the support, and the limiting vertical column II penetrates through the support and connects the lifting plate II.

5. The biological denitrification and dephosphorization MBR sewage treatment system according to claim 1, characterized in that The specific steps of the treatment process are as follows: 1) Pretreatment tank: coarse grids with a gap of 20-50 mm are arranged to filter large-particle impurities, fine grids with a gap of 1-5 mm are arranged to filter small suspended solids, HCl or NaOH is added to control the pH of the sewage in the range of 6.5-8.5, and a low-speed submersible agitator is used to set the stirring speed at 50-60 rpm to prevent sludge deposition; 2) Anaerobic tank treatment: ensure the hydraulic retention time HRT is 1-3 hours, the dissolved oxygen concentration is <0.2 mg / L, ensure a strict anaerobic environment, the sludge concentration is maintained at 3,000-5,000 mg / L, too high can lead to sludge floating, too low is not sufficient to release phosphorus, using low-speed mechanical stirring, stirring speed is set to 20-30 rpm, to prevent sludge deposition, but avoid excessive agitation to introduce oxygen; 3) Anoxic tank treatment: for denitrification, improve the nitrogen removal efficiency of the system, ensure the hydraulic retention time HRT is 2-4 hours, the dissolved oxygen concentration is <0.5 mg / L, ensure a micro-aerobic environment, using low-speed mechanical stirring, stirring speed is set to 10-20 rpm, to prevent sludge deposition after denitrification gas floating; 4) Aerobic tank treatment: ensure the hydraulic retention time HRT is 4-8 hours, the dissolved oxygen concentration is ensured at 2-4 mg / L, through the aeration mechanism in the aerobic tank, motor II drives the transmission shaft I rotation, the transmission shaft I drives the bevel gear I rotation, the bevel gear I engages the bevel gear II, the bevel gear II drives the transmission shaft II rotation, the transmission shaft II drives the bevel gear III, the bevel gear III engages the bevel gear IV, the bevel gear IV drives the connecting shaft I rotation, the connecting shaft I drives the bronchus and spiral blade rotation, when the gas is blown out through the bronchus into the sewage, the bubbles will be scattered by the spiral blade, further increasing the contact area of gas and liquid, enhancing the aeration effect, the gas hole diameter on the bronchus is ≤2 mm, the oxygen utilization rate is increased to 30%-40%, the operation cycle is 15 min of aeration followed by 5 min of stop aeration; The floating slag produced after aeration is cleaned by the floating slag cleaning mechanism, the walking mechanism in the floating slag cleaning mechanism controls the first and second scraping mechanisms to scrape, the motor V of the walking mechanism controls the gear III to rotate, the gear III engages the rack III, the rack III is fixed on the support plate, the gear III drives the support to move along the rack III, the motor VI drives the worm to rotate, the worm engages the worm gear, the worm gear rotates, the worm gear inside the center engages the threaded rod, the worm gear rotation drives the threaded rod to lift, the threaded rod lifting drives the lifting plate II to lift, the lifting plate drives the adjusting mechanism to move and lift, the motor VIII of the adjusting mechanism controls the connecting rod I to rotate, the connecting rod I drives the connecting rod II, the connecting rod III, and the connecting rod IV to swing through the connecting rod II, the connecting rod III, the connecting rod IV drives the connecting rod to swing, the connecting rod drives the motor IX and the connecting shaft II to swing, the connecting shaft II adjusts the position of the first and second scraping mechanisms; 5) MBR membrane tank treatment: through the microfiltration membrane, the filter membrane pore size is 0.01-0.4 μm, completely removing suspended solids and bacteria, degrading residual organic matter, the membrane flux is set to 15-25 L / (m²·h), the aeration intensity is set to 0.3-0.5 Nm³ / (m²·h), the pumping time is 8-12 min of pumping followed by 2-3 min of stop, first using UV disinfection, the dose is 30-40 mJ / cm², then adding sodium hypochlorite, the dosage is 5-10 mg / L, completing the wastewater treatment process.

6. The biological denitrification and dephosphorization MBR sewage treatment system according to claim 5, characterized in that The scum fishing mechanism on the first scraping mechanism in step 4) is controlled to rotate the lead screw II by the motor VII, the lead screw II drives the moving seat to move, the moving seat drives the angle stepping motor I to move, the angle stepping motor I controls the rotation of the connecting plate I, the connecting plate I drives the cable reel to swing, the cable reel controls the extension and retraction of the towline, the towline drives the net bag at the lower part, and when the walking mechanism drives the scum fishing mechanism to move to the side of the box, the net bag fishes and cleans the suspended impurities in the sewage; the angle stepping motor II of the first scraping mechanism drives the gear IV to rotate, the gear IV meshes with the gear V, and the gear V drives the scraper I to rotate to adjust the inclination angle of the scraper I according to the needs; The motor X and the motor XI of the second scraping mechanism control the angle of the scraper III and the mesh plate, so that the two groups of scrapers and the mesh plate form an included angle, the efficiency of scraping and cleaning the scum is improved, the scraper IV is controlled to swing downward by the angle stepping motor IV, the scraper IV and the scraper II and the scraper III at the front end form a height difference, the scum that cannot be scraped off by the scraper II and the scraper III is scraped off again, the overflow plate arranged on the scraper IV blocks the scum from passing through under the premise of ensuring the flow of water, and the scraping efficiency is further improved, the first scraping mechanism and the second scraping mechanism scrape the floating scum in the sewage back and forth at a speed of 25-60 rpm for 35-50 min to the scum conveying mechanism; The motor III of the scum conveying mechanism controls the rotation of the lead screw I, the lead screw I drives the lifting plate I to lift, and the lifting plate I is lifted to the appropriate position according to the height of the sewage in the box, the motor IV controls the rotation of the auger, the scraper collects the floating scum on the upper part of the sewage, and then the auger sends out the floating scum, the electric push rod pulls the push plate backward during the process of collecting the floating scum, the push plate drives the rack II backward, the rack II meshes with the half gear, the half gear drives the sliding cover to rotate backward, and the sliding cover opens to collect the floating scum, the electric push rod pushes the push plate forward during the process of conveying the floating scum, the push plate drives the rack II forward, the rack II meshes with the half gear, the half gear drives the sliding cover to slide forward, and the sliding cover is closed to ensure that the floating scum does not leak during the conveying process, and large-area scum cleaning is completed.

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