Shallow air floatation tank for sewage treatment

Abstract

The invention belongs to the technical field of sewage treatment, particularly relates to a shallow air floatation tank for sewage treatment, and provides the following scheme aiming at the problem of difficulty in later cleaning caused by arrangement of a stirring device for mixing bubbles and water in the prior art: the shallow air floatation tank comprises a total tank body with an upward opening and an overall barrel-shaped structure, a slag discharging groove extending to the middle is inserted in the position, close to the top end, of the circumferential outer wall of the main tank body, a clean water tank of an annular box body structure is fixed to the end, close to the middle of the main tank body, of the slag discharging groove, an arch-shaped fixing frame is fixed to the top end of the main tank body, and a first anti-disengaging bearing is embedded in the middle of the arch-shaped fixing frame; and a sealing bearing II which is coaxial with the anti-falling bearing I is embedded in the middle of the bottom of the total tank body. According to the device, bubbles can be uniformly introduced into the bottom of the tank to be in full contact with sewage, the paths of the bubbles which are sprayed out and prepared to vertically float can be changed by matching with the rotating scraping plate, a mixing effect is achieved, and uniform mixing of the bubbles and the sewage can be achieved without arranging a specific stirring mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a shallow flotation tank for sewage treatment. Background Art

[0002] Shallow flotation tanks are control devices used for water pollution control, primarily removing suspended solids and other pollutants from the water through flotation. During operation, treated sewage and high-pressure water flow through a bubble generator, dissolving air in the water and generating tiny bubbles. The treated water then enters the flotation tank. During this process, the tiny bubbles come into contact with suspended solids, oil, and other pollutant particles in the water. Due to the adhesion of the bubbles, they carry the pollutants to the surface. This is because the buoyancy of the bubbles carries the pollutants toward the surface. The relatively light specific gravity of the pollutants makes them easily attached to the bubbles. Finally, the buoyancy causes the pollutants to accumulate on the water surface, forming a scum layer. This scum can then be removed using a scraping device. After flotation, the scum on the water surface is removed, and the clean water at the bottom is discharged, achieving the purpose of removing suspended solids.

[0003] In actual use, a stirring device is required to achieve full contact between bubbles and sewage. However, setting up a stirring device in such a large pool not only consumes a lot of energy in terms of driving, but also after a period of use, a large amount of difficult-to-clean oil or other scale will adhere to the surface of the stirring device. Therefore, we propose a new type of shallow flotation tank for sewage treatment. Summary of the Invention

[0004] To address the technical problem in the prior art of providing a stirring device for mixing bubbles and water, which results in difficulty in subsequent cleaning, the present invention adopts the following technical solution:

[0005] A shallow flotation tank for sewage treatment, comprising a main tank body with an upward opening and an overall barrel-shaped structure, a slag discharge trough extending to the middle is inserted near the top of the circumferential outer wall of the main tank body, and the opening of the slag discharge trough is upward, and a clean water tank with an overall annular box structure is fixed to one end of the slag discharge trough near the middle of the main tank body, a bow-shaped fixing frame is fixed to the top of the main tank body, and an anti-slip bearing 1 is embedded in the middle of the bow-shaped fixing frame, a sealed bearing 2 coaxial with the anti-slip bearing is embedded in the middle of the bottom of the main tank body, and the anti-slip bearing 1 and the sealed bearing 2 are rotatably connected with the same vertical rotating water supply pipe, and the circumferential outer wall of the rotating water supply pipe is located at the top of the clean water tank and fixed with two alternating drainage pipes; the main tank body There are multiple small holes at the bottom, and branch pipes are inserted into the small holes. Two ventilation pipes connected to the bubble generator are fixed to the bottom ends of all the branch pipes; a clean water discharge pipe and a connecting pipe are respectively inserted near the left and right sides of the bottom of the clean water tank, and a membrane cloth fixing box is fixed to the bottom end of the connecting pipe. A water inlet is reserved at the bottom end of the membrane cloth fixing box, and a permeable membrane cloth for filtering is fixed at the water inlet. A fixing frame is fixed to the circumferential outer wall of the rotating water supply pipe near the bottom end, and two bendable fixing rods are fixed to the outer wall of the fixing frame. A scraper is fixed to the bottom end of the bendable fixing rod, and a cleaning rod 2 is reserved on the upper surface of the scraper. When the scraper rotates at the bottom of the pool, the cleaning rod 2 can clean the sludge on the lower surface of the permeable membrane cloth.

[0006] Preferably, the longitudinal section of the scraper is in the shape of a letter "7", and the top end of the second cleaning rod contacts the lower surface of the water-permeable membrane cloth.

[0007] Preferably, a convergence hole is opened near the middle of the bottom of the main pool body, and the overall convergence hole is a trumpet-shaped structure with an opening upward, which is conducive to the convergence of sludge, and a conical funnel is fixed to the bottom of the convergence hole by bolts, and a sewage valve is provided at the bottom end of the conical funnel; the circumferential outer wall of the rotating water supply pipe is reserved for fixing an external pipe for fixing the alternating drainage pipe near the top, and the circumferential outer walls of the alternating drainage pipe are connected with a vertically downward narrow sewage pipe, and the sewage is vertically flushed into the main pool body through the narrow sewage pipe. The bottom end of the narrow sewage pipe is higher than the top height of the slag trough to ensure that it can normally cross the slag trough during rotation. The top of the rotating water supply pipe is reserved for a thick barrel with an upward opening larger than the diameter of the rotating water supply pipe, and the thick barrel is clamped in the inner ring of the anti-slip bearing. The overall structure of the bow-shaped fixing frame The length direction is perpendicular to the extension direction of the slag discharge trough, and an L-shaped stop block is fixed on the side of the upper surface of the bow-shaped fixing frame away from the slag discharge trough, and a water guide ring with a tubular structure is slidably fitted on the circumferential inner wall of the rotating water supply pipe near the two external pipes, and a guide outlet is provided on the side of the water guide ring away from the slag discharge trough, and a hanging shaft rod extending vertically upward is fixed to the top of the water guide ring, and a pin hole is provided on the circumferential outer wall of the hanging shaft rod, and a bite hole that is matched with the pin hole height is provided on the side of the L-shaped stop block close to the pin hole, and the same locking pin is inserted between the bite hole and the pin hole; by arranging the water guide ring with the water outlet away from the slag discharge trough, in combination with two alternating drainage pipes, all the narrow sewage discharge pipes will temporarily stop discharging water when they rotate to above the slag discharge trough while discharging sewage.

[0008] Preferably, the clear water tank is reserved with an inner ring and an outer ring, and the height of the inner ring is higher than that of the outer ring, and the top height of the outer ring is equal to the circumferential edge height of the total tank body; the inner diameter of the inner ring is larger than the outer diameter of the rotating water supply pipe, and the circumferential outer wall of the total tank body is provided with a rectangular hole for plugging in the slag discharge trough near the top, and the slag discharge trough is arranged as a whole horizontally, and the top opening edge height of the slag discharge trough is lower than the top opening height of the total tank body and the outer ring. When in use, the water surface of the sewage is kept just flush with the top opening edge of the slag discharge trough, which is convenient for scraping the generated scum into the slag discharge trough, and secondly, the water level will not exceed the opening height of the total tank body and overflow.

[0009] Preferably, the bottom of the clean water tank is provided with mounting sockets near the left and right sides, and the two mounting sockets are used to install the clean water discharge pipe and the connecting pipe respectively; an inclined slide is fixed to the bottom of the slag discharge tank, and the height of the inclined slide close to one end of the clean water tank is higher than that of the other end; an air pipe perforation is provided at the bottom of the slag discharge tank near the outer wall of the main tank body, and a fan is fixed below the air pipe perforation, and a folded air pipe passing through the air pipe perforation is fixed to the outlet of the fan, and the outlet of the folded air pipe bypasses the highest end of the inclined slide toward the bottom end of the inclined slide.

[0010] Preferably, the upper surface of the outer ring is rotatably clamped with a rotating clamping ring, and the circumferential outer wall of the rotating clamping ring is fixed with two soft scrapers distributed symmetrically with the center, the soft scrapers are generally arc-shaped, and the plane where the bottom ends of the soft scrapers are located is 2-8mm higher than the top edge of the slag discharge trough. The lower surfaces of the two alternating drainage pipes are located above the rotating clamping ring and are fixed with connecting hangers, and the bottom ends of the connecting hangers are fixed to the upper surface of the rotating clamping ring; the circumferential outer wall of the rough barrel is fixed with a driven large gear near the bottom of the anti-slip bearing 1, and the bow-shaped fixing frame is embedded with an anti-slip bearing near the middle, and a short shaft rod is rotatably connected to the anti-slip bearing, and the upper and lower ends of the short shaft rod are respectively fixed with a bevel gear 1 and a driving pinion, and the driving pinion and the driven large gear are meshed with each other; the upper surface of the bow-shaped fixing frame is also fixed with a reduction motor 2, and the top end of the output shaft of the reduction motor 2 is fixed with a bevel pinion, and the bevel pinion and the bevel gear 1 are meshed with each other; through such an arrangement, the rotating water supply pipe and the mechanism fixed on its surface can be achieved to rotate slowly.

[0011] Preferably, a reserved tube with an upward protrusion and an annular structure is reserved in the middle of the bottom of the main tank body, and the inner diameter of the reserved tube is adapted to the outer diameter of the second sealing bearing. Such an arrangement can improve the sealing effect of the device.

[0012] Preferably, a scum collecting mechanism is provided below the outlet end of the scum discharge chute, and the scum collecting mechanism includes an intermediate collecting pool that is clamped and fixed to the bottom end of the scum discharge chute, and the top of the intermediate collecting pool is provided with a docking notch for clamping the scum discharge chute near the rear side, and the top of the intermediate collecting pool is provided with arc-shaped notches of the same size on the left and right sides, and the same C-shaped filter screen with the opening facing upward is fixed between the two arc-shaped notches, and an incoming water supply pipe is inserted into the side of the intermediate collecting pool near the bottom end, and a centrifugal water pump is fixed to the bottom end of the intermediate collecting pool, the centrifugal water pump includes an L-shaped suction pipe and a bottom water supply pipe, and the same sealed bearing is fixed between the outlet end of the bottom water supply pipe and the bottom end of the rotating water supply pipe, and the L-shaped suction pipe is inserted into the inside of the intermediate collecting pool; through the provided scum collecting mechanism, when in use, when a small amount of sewage in the total pool body is mixed with scum and discharged into the top of the C-shaped filter screen, the scum will be intercepted, and the sewage will be gathered into the intermediate collecting pool again through the C-shaped filter screen.

[0013] Preferably, a liquid level observation window is provided near the middle of the front of the intermediate convergence tank, and blocking bars are clamped on both side ends of the C-shaped filter; the blocking bars can prevent overflowing sewage from flowing out from the sides.

[0014] Preferably, a motor fixing bracket is fixed on the side of the intermediate convergence pool in the scum collection mechanism, close to the upper part of the incoming water supply pipe, and a reduction motor is fixed on the top of the motor fixing bracket, and a spiral scraper is fixed on the top of the output shaft of the reduction motor through a coupling, and an aggregate compression barrel with an opening facing the spiral scraper is fixed on the other side of the intermediate convergence pool, and the spiral scraper is divided into a cleaning section and a compression section, and the compression section extends into the aggregate compression barrel, and a discharge port is reserved at the bottom of the aggregate compression barrel, and a cleaning rod is reserved on the circumferential outer wall of the cleaning section of the spiral scraper.

[0015] The beneficial effects of the present invention are:

[0016] 1. By setting up branch pipes evenly distributed at the bottom of the main pool, not only can the bubbles be evenly introduced into the pool bottom to fully contact with the sewage, but the rotating scraper can also change the path of the bubbles that are sprayed out and ready to float vertically, playing a mixing role. There is no need to set up a specific stirring mechanism to achieve uniform mixing of bubbles and sewage, thereby improving the efficiency of water pollution control.

[0017] 2. By setting two scrapers at the bottom that rotate with the rotating water supply pipe, not only can the rising trajectory of the bubbles that are about to float up be changed during rotation, but also the bubbles can contact with sewage at other locations, thereby improving the effective attachment rate.

[0018] 3. Through the folded air pipe, when scraping slag, when the slag and foam gather in the slag discharge trough, they can be quickly discharged under the action of the inclined slide and wind force, so as to carry out the next round of slag gathering.

[0019] 4. By setting up the spiral scraper and aggregate compression barrel, the scum can be compressed and discharged while preventing the mesh of the C-shaped filter from being blocked, thereby improving the continuity of collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a shallow flotation tank for sewage treatment proposed by the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a shallow flotation tank for sewage treatment proposed by the present invention;

[0022] Figure 3 A top view of a shallow flotation tank for sewage treatment proposed by the present invention;

[0023] Figure 4 A shallow flotation tank for sewage treatment proposed by the present invention Figure 3 Schematic diagram of the cross-sectional structure along line AA;

[0024] Figure 5This is an assembly diagram of the clear water tank and the main tank body in a shallow flotation tank for sewage treatment proposed by the present invention;

[0025] Figure 6 This is an assembly diagram of a water guide ring in a shallow flotation tank for sewage treatment proposed by the present invention;

[0026] Figure 7 This is a schematic diagram of the overall structure of a scum collection mechanism in a shallow flotation tank for sewage treatment proposed by the present invention;

[0027] Figure 8 This is an exploded view of a scum collection mechanism in a shallow flotation tank for sewage treatment proposed by the present invention;

[0028] Figure 9 A side view of a shallow flotation tank for sewage treatment proposed by the present invention;

[0029] Figure 10 This is a side view of a bottom scraping mechanism in a shallow flotation tank for sewage treatment proposed by the present invention;

[0030] Figure 11 A shallow flotation tank for sewage treatment proposed by the present invention Figure 10 Schematic diagram of the enlarged structure at point B in the middle.

[0031] In the figure: 1. Main tank body; 101. Reserved pipe; 102. Converging hole; 103. Fine hole; 104. Rectangular hole; 2. Soft scraper; 3. Bow-shaped fixing frame; 301. Reducer motor 2; 302. Short shaft; 303. Conical gear 1; 304. L-shaped block; 305. Active pinion; 4. Alternating drainage pipe; 401. Connecting boom; 5. Clean water discharge pipe; 6. Rotating water supply pipe; 601. Rough barrel; 602. External pipe; 7. Bottom water supply pipe; 8. Incoming water supply pipe; 9. Scum collecting mechanism; 901. Blocking bar; 902. Arc notch; 903. Docking notch; 10. Motor fixing frame; 1001. Reducer motor; 11. C-shaped filter; 12. Spiral scraper; 121, cleaning rod 1; 13, aggregate compression barrel; 131, discharge port; 14, slag discharge chute; 141, air pipe perforation; 15, inclined slide plate; 16, clean water tank; 161, installation socket; 17, connecting pipe; 18, anti-slip bearing 1; 19, sealed bearing 1; 20, drain valve; 21, conical funnel; 22, vent pipe; 23, branch pipe; 24, folded air pipe; 25, fan; 26, centrifugal water pump; 27, scraper; 2701, cleaning rod 2; 28, driven large gear; 29, rotating retaining ring; 30, hanging shaft rod; 31, water guide ring; 32, fixing frame; 33, guide outlet; 34, pin hole; 35, permeable membrane cloth; 36, membrane cloth fixing box. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] In this embodiment, refer to Figures 1-11 A shallow flotation tank for sewage treatment includes a main tank body 1 with an upward opening and a barrel-shaped structure. A slag chute 14 extending to the middle is inserted near the top of the circumferential outer wall of the main tank body 1, and the opening of the slag chute 14 is upward. A clear water tank 16 with an overall ring-shaped box structure is fixed to one end of the slag chute 14 near the middle of the main tank body 1. A bow-shaped fixing frame 3 is fixed to the top of the main tank body 1, and an anti-slip bearing 18 is embedded in the middle of the bow-shaped fixing frame 3. The bottom of the main tank body 1 is provided with a plurality of slag chute 14 extending to the middle. A sealed bearing 2 coaxial with the anti-slip bearing 18 is embedded in the middle of the body, and the anti-slip bearing 18 and the sealed bearing 2 are rotatably connected with the same vertical rotating water supply pipe 6. The outer circumferential wall of the rotating water supply pipe 6 is located at the top of the clear water tank 16 and two alternating drainage pipes 4 are fixed; a plurality of fine holes 103 are opened at the bottom of the main tank body 1, and branch pipes 23 are inserted into the fine holes 103. Two ventilation pipes 22 connected to the bubble generator are fixed at the bottom ends of all the branch pipes 23; the clear water tank 16 is provided with a plurality of fine holes 103, and the branch pipes 23 are connected to the bottom ends of all the branch pipes 23. The bottom of the pool 16 is respectively connected with a clean water discharge pipe 5 and a connecting pipe 17 near the left and right sides. The bottom end of the connecting pipe 17 is fixed with a membrane cloth fixing box 36. The bottom end of the membrane cloth fixing box 36 is reserved for a water inlet, and a permeable membrane cloth 35 for filtering is fixed at the water inlet. A fixing frame 32 is fixed near the bottom end of the circumferential outer wall of the rotating water supply pipe 6, and two bendable fixing rods are fixed on the outer wall of the fixing frame 32. The bottom ends of the bendable fixing rods are fixed with scrapers 27, and the upper surface of the scraper 27 is reserved for a cleaning rod 2701. When the scraper 27 rotates at the bottom of the pool, the cleaning rod 2701 can clean the sludge on the lower surface of the permeable membrane cloth 35; by setting the branch pipes 23 evenly distributed at the bottom of the main pool body 1, not only can the bubbles be evenly passed into the pool bottom to fully contact with the sewage, but the rotating scraper 27 can also change the path of the bubbles sprayed out and ready to float vertically, thereby playing a mixing role. Uniform mixing of bubbles and sewage can be achieved without setting a specific stirring mechanism.

[0034] In the present invention, the longitudinal section of the scraper 27 is in the shape of a "7", and the top of the cleaning rod 2701 contacts the lower surface of the water-permeable membrane cloth 35; through such an arrangement, not only can the rising trajectory of the bubbles that are about to float up be changed during rotation, but the bubbles can also contact the sewage at other locations, thereby improving the effective adhesion rate.

[0035] Reference Figure 4-Figure 6, a gathering hole 102 is opened near the middle of the bottom of the main pool body 1, and the gathering hole 102 is an overall trumpet-shaped structure with an opening upward, which is conducive to the gathering of sludge, and a conical funnel 21 is fixed to the bottom of the gathering hole 102 by bolts, and a drain valve 20 is provided at the bottom end of the conical funnel 21; an external pipe 602 for fixing the alternating drainage pipe 4 is reserved near the top of the circumferential outer wall of the rotating water supply pipe 6, and the circumferential outer walls of the alternating drainage pipe 4 are connected with a vertically downward narrow drainage pipe, and the sewage is vertically flushed into the main pool body 1 through the narrow drainage pipe. The bottom end of the narrow drainage pipe is higher than the top height of the slag trough 14 to ensure that it can normally pass over the slag trough 14 during rotation. A thick barrel 601 with an upward opening larger than the diameter of the rotating water supply pipe 6 is reserved at the top of the rotating water supply pipe 6, and the thick barrel 601 is clamped in the inner ring of the anti-slip bearing 18, and the overall length direction of the bow-shaped fixing frame 3 is consistent with the drainage pipe. The extension direction of the slag trough 14 is vertical, and an L-shaped block 304 is fixed to the side of the upper surface of the bow-shaped fixing frame 3 away from the slag discharge trough 14, and a water guide ring 31 with a tubular structure is slidably fitted on the circumferential inner wall of the rotating water supply pipe 6 near the two external pipes 602, and a guide outlet 33 is provided on the side of the water guide ring 31 away from the slag discharge trough 14, and a hanging shaft rod 30 extending vertically upward is fixed to the top of the water guide ring 31, and a pin hole 34 is provided on the circumferential outer wall of the hanging shaft rod 30, and a bite hole that is height-matched to the pin hole 34 is provided on the side of the L-shaped block 304 close to the pin hole 34, and the same locking pin is inserted between the bite hole and the pin hole 34; by setting the water guide ring 31 with the water outlet away from the slag discharge trough 14, in combination with the two alternating drainage pipes 4, all the narrow sewage pipes will temporarily stop discharging water when they rotate to above the slag discharge trough 14 while discharging sewage.

[0036] Reference Figure 1 、 Figure 4 、 Figure 10 The clean water tank 16 is reserved with an inner ring and an outer ring, and the height of the inner ring is higher than the height of the outer ring, and the top height of the outer ring is equal to the height of the circumferential edge of the main tank body 1; the inner diameter of the inner ring is larger than the outer diameter of the rotating water supply pipe 6, and a rectangular hole 104 for plugging in the slag discharge chute 14 is opened near the top of the circumferential outer wall of the main tank body 1, and the slag discharge chute 14 is arranged as a whole horizontally, and the top opening edge height of the slag discharge chute 14 is lower than the top opening height of the main tank body 1 and the outer ring. When in use, the water surface of the sewage is kept flush with the top opening edge of the slag discharge chute 14, which is convenient for scraping the generated scum into the slag discharge chute 14, and secondly, the water level will not exceed the opening height of the main tank body 1 and overflow.

[0037] Reference Figure 4-Figure 5, the bottom of the clean water tank 16 is provided with mounting sockets 161 near the left and right sides, and the two mounting sockets 161 are used to install the clean water discharge pipe 5 and the connecting pipe 17 respectively; the bottom of the slag discharge trough 14 is fixed with an inclined slide plate 15, and the end of the inclined slide plate 15 close to the clean water tank 16 is higher than the other end; the bottom of the slag discharge trough 14 is provided with an air pipe through-hole 141 near the outer wall of the main tank body 1, and a fan 25 is fixed below the air pipe through-hole 141, and the outlet of the fan 25 is fixed with a folded air pipe 24 passing through the air pipe through-hole 141, and the outlet of the folded air pipe 24 bypasses the highest end of the inclined slide plate 15 toward the bottom end of the inclined slide plate 15; through the provided folded air pipe 24, when scraping slag, when slag and foam gather in the slag discharge trough 14, they can be quickly discharged under the action of the inclined slide plate 15 and wind force, so as to carry out the next round of slag gathering.

[0038] Reference Figure 1 、 Figure 3 and Figure 4 The upper surface of the outer ring is rotatably connected with a rotating clamping ring 29, and the outer circumferential wall of the rotating clamping ring 29 is fixed with two soft scrapers 2 that are symmetrically distributed in the center. The overall soft scraper 2 is an arc-shaped structure, and the plane where the bottom end of the soft scraper 2 is located is 2-8mm higher than the top edge of the slag discharge trough 14. The lower surfaces of the two alternating drainage pipes 4 are located above the rotating clamping ring 29 and are fixed with connecting rods 401. The bottom end of the connecting rod 401 is fixed to the upper surface of the rotating clamping ring 29; the outer circumferential wall of the rough barrel 601 is fixed with a driven large gear 28 near the bottom of the anti-slip bearing 18, and the bow An anti-slip bearing is embedded near the middle of the bow-shaped fixing frame 3, and a short shaft rod 302 is rotatably connected to the anti-slip bearing. The upper and lower ends of the short shaft rod 302 are respectively fixed with a bevel gear 1 303 and a driving pinion 305, and the driving pinion 305 is meshed with the driven large gear 28; the upper surface of the bow-shaped fixing frame 3 is also fixed with a reduction motor 2 301, and the top end of the output shaft of the reduction motor 2 301 is fixed with a bevel pinion, and the bevel pinion is meshed with the bevel gear 1 303; through such an arrangement, the rotating water supply pipe 6 and the mechanism fixed on its surface can be rotated slowly.

[0039] Reference Figure 4-Figure 5 A reserved tube 101 with an upwardly protruding circular ring structure is reserved in the middle of the bottom of the main tank body 1. The inner diameter of the reserved tube 101 is adapted to the outer diameter of the sealing bearing 2. Such a setting can improve the sealing effect of the device.

[0040] Reference Figure 1 、 Figure 7-Figure 8A slag collecting mechanism 9 is provided below the outlet end of the slag trough 14, and the slag collecting mechanism 9 includes an intermediate collecting pool fixed to the bottom end of the slag trough 14, and a docking notch 903 for clamping the slag trough 14 is provided at the top of the intermediate collecting pool near the rear side, and an arc-shaped notch 902 of the same size is provided on the left and right sides of the top of the intermediate collecting pool, and a C-shaped filter screen 11 with the same opening upward is fixed between the two arc-shaped notches 902, and a water supply pipe 8 is inserted into the side of the intermediate collecting pool near the bottom end, and the intermediate collecting pool is provided with a plurality of filter screens 11, 10 and 15. A centrifugal water pump 26 is fixed at the bottom end of the pool. The centrifugal water pump 26 includes an L-shaped water suction pipe and a bottom water supply pipe 7. The same sealed bearing 19 is fixed between the outlet end of the bottom water supply pipe 7 and the bottom end of the rotating water supply pipe 6. The L-shaped water suction pipe is inserted into the interior of the intermediate convergence pool; through the scum collection mechanism 9, when in use, when a small amount of sewage in the main pool body 1 is mixed with scum and discharged into the top of the C-shaped filter 11, the scum will be intercepted, and the sewage will pass through the C-shaped filter 11 and converge into the intermediate convergence pool again.

[0041] Reference Figure 8 A liquid level observation window is provided near the middle of the front of the intermediate convergence pool, and blocking bars 901 are clamped on both side ends of the C-shaped filter screen 11; the blocking bars 901 can prevent overflowing sewage from flowing out from the sides.

[0042] Reference Figure 7-8 A motor fixing frame 10 is fixed to the side of the intermediate convergence pool in the scum collection mechanism 9, near the top of the incoming water supply pipe 8, and a reduction motor 1001 is fixed to the top of the motor fixing frame 10, and a spiral scraper 12 is fixed to the top of the output shaft of the reduction motor 1001 through a coupling, and an aggregate compression barrel 13 with an opening facing the spiral scraper 12 is fixed on the other side of the intermediate convergence pool. The spiral scraper 12 is divided into a cleaning section and a compression section. The compression section extends into the aggregate compression barrel 13. A discharge port 131 is reserved at the bottom of the aggregate compression barrel 13, and a cleaning rod 121 is reserved on the circumferential outer wall of the cleaning section of the spiral scraper 12; by arranging the spiral scraper 12 and the aggregate compression barrel 13, the scum can be compressed and discharged while preventing the mesh of the C-shaped filter 11 from being blocked, thereby improving the continuity of collection.

[0043] Working principle: When using this device, first close the sewage valve 20 at the bottom of the device, connect the inlet of the two ventilation pipes 22 to the outlet of the bubble generator; then control the water inlet and outlet of the incoming water supply pipe 8 and the centrifugal water pump 26 until the sewage in the main pool body 1 is filled to the same level as the top opening of the slag discharge trough 14, then reduce the water outlet of the incoming water supply pipe 8, and then turn on the bubble generator to start spraying bubbles upward from the bottom of the pool. After the slag slowly forms and floats up, start the reduction motor 2 301 at the top of the bow-shaped fixing frame 3, which will slowly drive the rotating water supply pipe 6 to rotate. At this time, the branch pipes 23 evenly distributed at the bottom of the main pool body 1 can not only evenly pass the bubbles into the pool bottom to fully contact with the sewage, but also cooperate with the rotating scraper 27 to change the path of the bubbles that are ejected and ready to float vertically, thereby playing a mixing role; when the two alternating drainage pipes 4 rotate, the two soft scrapers 2 will also be driven to rotate, and then the scum floating on the water surface will be slowly scraped into the scum discharge trough 14, and then blown onto the C-shaped filter 11 in the scum collection mechanism 9 under the action of the folded air pipe 24, and then squeezed into the aggregate compression barrel 13 under the action of the spiral scraper 12, and finally discharged after compression.

[0044] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A shallow flotation tank for sewage treatment, comprising a main tank body (1) with an upward opening and an overall barrel-shaped structure, characterized in that: The circumferential outer wall of the main pool body (1) is connected to a slag discharge trough (14) extending to the middle near the top, and a clear water tank (16) with an overall annular box structure is fixed to the end of the slag discharge trough (14) near the middle of the main pool body (1). The top of the main pool body (1) is fixed with an arched fixing frame (3), and an anti-slip bearing (18) is embedded in the middle of the arched fixing frame (3). A sealed bearing (2) coaxial with the anti-slip bearing (18) is embedded in the middle of the bottom of the main pool body (1), and the anti-slip bearing (18) and the sealed bearing (2) are rotatably connected to the same vertical rotating water supply pipe (6). The circumferential outer wall of the rotating water supply pipe (6) is located at the top of the clear water tank (16) and fixed with two alternating drainage pipes (4); a plurality of fine holes (103) are opened at the bottom of the main pool body (1), and branch pipes (23) are inserted in each of the fine holes (103). ), two ventilation pipes (22) are fixed at the bottom ends of all the branch pipes (23); the bottom of the clean water pool (16) is respectively connected with a clean water discharge pipe (5) and a connecting pipe (17) near the left and right sides, and the bottom end of the connecting pipe (17) is fixed with a membrane cloth fixing box (36), and a water inlet is reserved at the bottom end of the membrane cloth fixing box (36), and a water-permeable membrane cloth (35) for filtering is fixed at the water inlet, and a fixing frame (32) is fixed to the outer wall of the circumference of the rotating water supply pipe (6) near the bottom end, and two bendable fixing rods are fixed to the outer wall of the fixing frame (32), and the bottom ends of the bendable fixing rods are fixed with scrapers (27), and the upper surface of the scrapers (27) is reserved with cleaning rods 2 (2701), and when the scrapers (27) rotate at the bottom of the pool, the cleaning rods 2 (2701) can clean the sludge on the lower surface of the water-permeable membrane cloth (35).

2. A shallow flotation tank for sewage treatment according to claim 1, characterized in that: The longitudinal section of the scraper (27) is in the shape of a letter "7", and the top end of the second cleaning rod (2701) contacts the lower surface of the water-permeable membrane cloth (35).

3. The shallow flotation tank for sewage treatment according to claim 1, characterized in that: The bottom of the main pool body (1) is provided with a convergence hole (102) near the middle, and a conical funnel (21) is fixed to the bottom of the convergence hole (102) by bolts, and a sewage valve (20) is provided at the bottom end of the conical funnel (21); the outer circumferential wall of the rotating water supply pipe (6) is provided with an external pipe (602) for fixing the alternating drainage pipe (4) near the top, and the outer circumferential wall of the alternating drainage pipe (4) is connected with a vertically downward narrow sewage pipe, and the sewage is vertically flushed into the main pool body (1) through the sewage pipe. The top of the rotating water supply pipe (6) is provided with a thick barrel (601) with an opening upward and a diameter larger than that of the rotating water supply pipe (6), and the thick barrel (601) is clamped in the inner ring of the anti-slip bearing (18). The overall length direction of the bow-shaped fixing frame (3) is An L-shaped stop block (304) is fixed on the side of the upper surface of the arched fixing frame (3) away from the slag discharge trough (14) and perpendicular to the extension direction of the slag discharge trough (14). A water guide ring (31) with a tubular structure is slidably fitted on the inner circumferential wall of the rotating water supply pipe (6) near the two external pipes (602), and a guide outlet (33) is provided on the side of the water guide ring (31) away from the slag discharge trough (14). A suspension shaft rod (30) extending vertically upward is fixed to the top of the water guide ring (31), and a pin hole (34) is provided on the outer circumferential wall of the suspension shaft rod (30). A bite hole that matches the height of the pin hole (34) is provided on the side of the L-shaped stop block (304) near the pin hole (34), and a same locking pin is inserted between the bite hole and the pin hole (34).

4. A shallow flotation tank for sewage treatment according to claim 1, characterized in that: The clean water tank (16) is reserved with an inner ring and an outer ring, and the height of the inner ring is higher than that of the outer ring, and the top height of the outer ring is equal to the height of the circumferential edge of the main tank body (1); a rectangular hole (104) for inserting a slag discharge trough (14) is opened near the top of the circumferential outer wall of the main tank body (1), and the slag discharge trough (14) is arranged as a whole horizontally, and the top opening edge height of the slag discharge trough (14) is lower than the top opening height of the main tank body (1) and the outer ring.

5. A shallow flotation tank for sewage treatment according to claim 4, characterized in that: The bottom of the clean water tank (16) is provided with mounting holes (161) near the left and right sides, and the two mounting holes (161) are used to install the clean water discharge pipe (5) and the connecting pipe (17) respectively; the bottom of the slag discharge tank (14) is fixed with an inclined slide plate (15), and the height of one end of the inclined slide plate (15) close to the clean water tank (16) is higher than the other end; the bottom of the slag discharge tank (14) is provided with an air pipe through hole (141) near the outer wall of the main tank body (1), and a fan (25) is fixed below the air pipe through hole (141), and the outlet of the fan (25) is fixed with a folded air pipe (24) passing through the air pipe through hole (141), and the outlet of the folded air pipe (24) bypasses the highest end of the inclined slide plate (15) toward the bottom end of the inclined slide plate (15).

6. A shallow flotation tank for sewage treatment according to claim 5, characterized in that: The upper surface of the outer ring is rotatably clamped with a rotating clamping ring (29), and two soft scrapers (2) are fixed on the circumferential outer wall of the rotating clamping ring (29) and are symmetrically distributed in the center. The soft scrapers (2) are of an overall arc-shaped structure, and the plane where the bottom ends of the soft scrapers (2) are located is 2-8 mm higher than the top edge of the slag discharge trough (14). The lower surfaces of the two alternating drainage pipes (4) are located above the rotating clamping ring (29) and are fixed with connecting rods (401). The bottom ends of the connecting rods (401) are fixed to the upper surface of the rotating clamping ring (29); the circumferential outer wall of the rough barrel (601) is close to the anti-slip bearing ( A driven large gear (28) is fixed below the bow-shaped fixing frame (3), and an anti-slip bearing is embedded near the middle of the bow-shaped fixing frame (3), a short shaft (302) is rotatably connected in the anti-slip bearing, and a bevel gear 1 (303) and a driving pinion (305) are fixed at the upper and lower ends of the short shaft (302), and the driving pinion (305) and the driven large gear (28) are meshed with each other; a reduction motor 2 (301) is also fixed on the upper surface of the bow-shaped fixing frame (3), and a bevel pinion is fixed at the top end of the output shaft of the reduction motor 2 (301), and the bevel pinion and the bevel gear 1 (303) are meshed with each other.

7. The shallow flotation tank for sewage treatment according to claim 1, characterized in that: A reserved tube (101) protruding upwards and having a circular ring structure is reserved in the middle of the bottom of the main tank body (1), and the inner diameter of the reserved tube (101) is adapted to the outer diameter of the second sealing bearing.

8. The shallow flotation tank for sewage treatment according to claim 1, characterized in that: A scum collecting mechanism (9) is provided below the outlet end of the slag discharge trough (14), and the scum collecting mechanism (9) includes an intermediate collecting pool fixedly connected to the bottom end of the slag discharge trough (14), a docking notch (903) for connecting to the slag discharge trough (14) is provided at the top of the intermediate collecting pool near the rear side, and arc-shaped notches (902) of the same size are respectively provided on the left and right sides of the top of the intermediate collecting pool, and a C-shaped filter screen (11) with an upward opening is fixed between the two arc-shaped notches (902), a side of the intermediate collecting pool near the bottom end is connected to an incoming water supply pipe (8), and a centrifugal water pump (26) is fixed to the bottom end of the intermediate collecting pool, the centrifugal water pump (26) includes an L-shaped water pump and a bottom water supply pipe (7), a sealed bearing (19) is fixed between the outlet end of the bottom water supply pipe (7) and the bottom end of the rotating water supply pipe (6), and the L-shaped water pump is connected to the interior of the intermediate collecting pool.

9. A shallow flotation tank for sewage treatment according to claim 8, characterized in that: A liquid level observation window is provided near the middle of the front of the intermediate convergence tank, and blocking bars (901) are clamped at both end portions of the C-shaped filter (11).

10. The shallow flotation tank for sewage treatment according to claim 8, characterized in that: A motor fixing frame (10) is fixed on the side of the intermediate convergence pool in the scum collection mechanism (9) near the upper side of the incoming water supply pipe (8), and a reduction motor (1001) is fixed on the top of the motor fixing frame (10), and a spiral scraper (12) is fixed on the top of the output shaft of the reduction motor (1001) through a coupling, and an aggregate compression barrel (13) with an opening facing the spiral scraper (12) is fixed on the other side of the intermediate convergence pool, and the spiral scraper (12) is divided into a cleaning section and a compression section, and the compression section extends into the aggregate compression barrel (13), and a discharge port (131) is reserved at the bottom of the aggregate compression barrel (13), and a cleaning rod (121) is reserved on the circumferential outer wall of the cleaning section of the spiral scraper (12).

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