Fluidization device suitable for long-distance backflow of MBBR filler

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses a fluidizing device suitable for long-distance backflow of MBBR (Moving Bed Biofilm Reactor) filler. Comprising a filler conveying vertical pipe, a conveying transverse pipe, an inclined conveying pipe and a diversion trench, the filler conveying vertical pipe is fixedly arranged at the tail end of the aerobic tank; the water outlet is positioned above the starting end of the anoxic section of the biochemical pool; the conveying transverse pipe is provided with a backflow flushing pipe and an air pipe, and the inclined conveying pipe is provided with an air pipe; jet holes are formed in the parallel laying part of the backflow flushing pipe; one end of the backflow flushing pipe outside the pipe is connected with a fan; one ends, positioned outside the pipes, of the two air pipes are connected to an air stripping fan; the utility model solves the problem that MBBR (Moving Bed Biofilm Reactor) filler is accumulated because the distance between the tail end of an aerobic section and the tail end of an anoxic section in the existing pool type structure is long and the long-distance backflow effect is poor.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically a fluidization device suitable for long-distance return MBBR packing. Background Technology

[0002] In the renovation of municipal wastewater treatment plants, the MBBR process is often used in the primary accumulator tank. MBBR is a highly efficient wastewater treatment method that combines the advantages of biofilm and activated sludge processes. MBBR stands for Moving Bed Biofilm Reactor. Its core technology lies in using suspended packing material with a specific gravity close to that of water as a carrier for microbial growth. This packing material easily moves freely with the water under slight agitation, forming an effective fluidized state, thereby greatly increasing the contact area and contact time between microorganisms and wastewater, and improving treatment efficiency.

[0003] To ensure the stability and activity of the biofilm and prevent the suspended packing material from accumulating at the end of the aerobic tank, this process typically requires a reflux system to return the suspended packing material from the end of the aerobic tank to the beginning of the anoxic tank. In actual retrofit projects, it has been found that some projects using corridor-type or oxidation ditch structures have a significant distance between the end of the aerobic section and the end of the anoxic section, leading to poor long-distance reflux and resulting in the accumulation of MBBR packing material.

[0004] Therefore, a new type of fluidization device with long-distance return MBBR packing for wastewater treatment is needed to solve the above problems. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and proposes a fluidization device suitable for long-distance recirculation of MBBR packing; it solves the problem that the distance between the end of the aerobic section and the end of the anoxic section in the existing tank structure is too far, resulting in poor long-distance recirculation effect and accumulation of MBBR packing.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A fluidization device suitable for long-distance return MBBR packing includes a packing conveying riser, a conveying horizontal pipe, a return flushing pipe, an air pipe, an inclined conveying pipe, and a guide channel. The packing conveying riser is fixedly installed at the end of the aerobic tank. The end of the packing conveying riser is connected to the beginning of the conveying horizontal pipe. The end of the conveying horizontal pipe is connected to the beginning of the inclined conveying pipe. The inclined conveying pipe is inclined upwards, and its end is connected to the beginning of the guide channel. The end of the guide channel is provided with an outlet. The outlet is located above the beginning of the anoxic section of the biological treatment tank. The conveying horizontal pipe has a return flushing pipe and an air pipe, and is inclined upwards. The conveying pipe is equipped with an air pipe; the bottom of the return flushing pipe extends into the conveying horizontal pipe from the end of the adjacent conveying horizontal pipe and is laid parallel to the beginning of the conveying horizontal pipe; the air pipe installed on the conveying horizontal pipe extends into the conveying horizontal pipe from a distance from the end of the conveying horizontal pipe and is laid horizontally inside the conveying horizontal pipe to the beginning of the inclined conveying pipe; the air pipe installed on the inclined conveying pipe extends into the inclined conveying pipe and is laid in the direction of water flow inside the inclined conveying pipe; the parallel section of the return flushing pipe is provided with a spray hole; a blower is connected to the end of the return flushing pipe located outside the pipe; the ends of the two air pipes located outside the pipe are connected to an air lifting blower.

[0008] Furthermore, the packing material conveying riser is set vertically and is fixed to the end wall of the aerobic tank using pipe clamps.

[0009] Furthermore, the top of the packing conveying riser is equipped with a water intake port, and the bottom of the packing conveying riser extends to the bottom of the aerobic tank.

[0010] Furthermore, the inclined delivery pipe is a square pipe, laid at a 45° angle to the bottom pool.

[0011] Furthermore, the air pipe installed in the inclined conveyor pipe extends from the middle of the inclined conveyor pipe.

[0012] Furthermore, the lower part of the parallel-laid portion of the reflux flushing pipe is provided with two rows of spray holes at a 45° angle.

[0013] Furthermore, both the return flushing pipe and the air pipe are UPVC pipes.

[0014] Furthermore, both the packing conveying riser and the conveying horizontal pipe are square tubes.

[0015] The beneficial effects of this utility model compared to the prior art are as follows:

[0016] This invention is applicable to fluidization of MBBR packing material with long-distance return flow. In actual use, the wastewater at the end of the aerobic tank and the MBBR packing material mixture flow into the conveying riser through the suction port at the top of the packing material conveying riser, and then into the bottom conveying horizontal pipe. A packing material return flushing pipe is installed inside the conveying horizontal pipe. The return flushing pipe provides forced circulation and agitation to the conveying horizontal pipe, preventing activated sludge and packing material from settling into the conveying horizontal pipe. UPVC air pipes are installed at the end of the conveying horizontal pipe and in the middle of the inclined conveying pipe, allowing gas to be introduced into the bottom of the pipe, generating bubbles that lift the mixture in the pipe to the top guide channel of the tank, and then flow through the outlet of the guide channel to the beginning of the anoxic section of the biological treatment tank. This device avoids the accumulation of MBBR packing material. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural schematic diagram of the fluidization device for long-distance recirculation MBBR packing described in this utility model;

[0018] Figure 2 This is a schematic diagram of the reflux flushing pipe.

[0019] Figure label:

[0020] 1. Packing conveying riser; 2. Suction port; 3. Conveying horizontal pipe; 4. Return flushing pipe; 5. Air pipe; 6. Inclined conveying pipe; 7. Guide channel; 8. Water outlet; 9. Spray hole. Detailed Implementation

[0021] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0022] See Figure 1 and Figure 2 This embodiment proposes a fluidization device suitable for long-distance return MBBR packing, including a packing conveying riser 1, a conveying horizontal pipe 3, a return flushing pipe 4, an air pipe 5, an inclined conveying pipe 6, and a guide channel 7.

[0023] The packing material conveying riser 1 is vertically installed and fixed to the end wall of the aerobic tank using pipe clamps. The top of the packing material conveying riser 1 has a suction port 2, and its end connects to the beginning of the horizontal conveying pipe 3. The horizontal conveying pipe 3 is approximately horizontal, and its end connects to the beginning of the inclined conveying pipe 6. The inclined conveying pipe 6 is angled upwards, and its end connects to the beginning of the guide channel 7. The guide channel 7 is approximately horizontal, and its end has a water outlet 8. The horizontal conveying pipe 3 has a return flushing pipe 4 and an air pipe 5, and the inclined conveying pipe 6 has an air pipe 5 in the middle.

[0024] Specifically, in this embodiment, the packing conveying riser 1 is a 350mm×350mm square tube, the water inlet 2 at the top of the packing conveying riser 1 has a plane size of 500mm×500mm and a height of 350mm, and the top of the absorption inlet 2 is located 500mm below the liquid level; the packing conveying riser 1 extends to the bottom of the pool.

[0025] The horizontal conveying pipe 3 is a 350mm×350mm square pipe, laid at the bottom of the pool with a slope of 0.01, and its two ends are connected to the packing conveying vertical pipe 1 and the inclined conveying pipe 6, respectively.

[0026] The return flushing pipe 4 is a UPVC pipe, which extends into the bottom of the pipe 1m from the end of the conveying horizontal pipe 3 and is laid parallel to the beginning of the conveying horizontal pipe 3. The lower part of the parallel section of the return flushing pipe 4 has two rows of spray holes 9 staggered at 45°; the hole spacing of the spray holes 9 is 50mm; the hole diameter of the spray holes 9 is 4mm.

[0027] Air pipe 5 is a UPVC pipe. Air pipe 5 is installed in the horizontal conveying pipe 3 and extends into the bottom of the pipe 0.5m from the end of the horizontal conveying pipe 3. It is laid horizontally inside the horizontal conveying pipe 3 to the beginning of the inclined conveying pipe 6.

[0028] The inclined conveying pipe 6 is a 350mm×350mm square pipe, laid at a 45° angle to the bottom pool. A DN65 air pipe 5 is installed in the middle of the inclined conveying pipe 6 and extends into it, and is laid for 0.5m along the water flow direction inside the inclined conveying pipe 6.

[0029] The inclined conveying pipe 6 is welded to the end of a guide channel 7 with a cross section of 350mm×350mm (H). The guide channel 7 has a slope of 0.01 and a 350mm×350mm outlet 8 is provided at the end. The outlet 8 is located 100mm above the liquid surface.

[0030] In operation, the packing material conveying riser 1 is fixed to the end of the aerobic tank using pipe clamps. Wastewater from the aerobic tank and the MBBR packing material mixture flow into the conveying riser 1 through the suction port 2 at the top, and then into the conveying horizontal pipe 3 at the bottom. A return flushing pipe 4 is installed inside the conveying horizontal pipe 3; one end of the return flushing pipe 4 extends into the bottom of the pipe 3 1m from the end of the conveying horizontal pipe 3 and is laid along the pipe 3 to the beginning; the other end of the return flushing pipe 4 is connected to a blower for forced circulation and agitation. The return flushing pipe 4 operates intermittently, purging for 10 minutes every hour, with an agitation intensity of 0.01~0.015m. 3 air / min.m 2 The flow velocity is 8-10 m / s. This prevents activated sludge and packing material from depositing in the horizontal conveying pipe 3. Air pipes 5 are installed at the end of the horizontal conveying pipe 3 and in the middle of the inclined conveying pipe 6. One end of the air pipe 5 extends into the bottom of the corresponding pipe and is laid 0.5 m along the water flow direction; the other ends of the two air pipes 5 are connected to an air-lift blower, which introduces gas into the bottom of the pipe, generating bubbles and lifting the mixed liquid in the pipe to the guide channel 7 at the top of the tank. The liquid then flows through the outlet 8 of the guide channel 7 to the beginning of the anoxic section of the biological treatment tank. The straight path connecting the horizontal conveying pipe 3, the inclined conveying pipe 6, and the guide channel 7 directly shortens the distance between the end of the aerobic section and the end of the anoxic section; and the cooperation of the return flushing pipe 4 and the air pipes 5 allows the mixed liquid to flow rapidly from low to high into the anoxic section of the biological treatment tank.

[0031] This invention provides a novel fluidization device for long-distance return MBBR packing material in wastewater treatment, which can solve the problem of poor return effect caused by the large distance between the end of the aerobic section and the end of the anoxic section in some tank structures in the renovation project, and avoid the accumulation of MBBR packing material.

[0032] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all such deductions or substitutions should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A fluidization device suitable for use with a long distance backflow MBBR media, characterized in that, The filler conveying vertical pipe (1), the conveying horizontal pipe (3), the backwash pipe (4), the air pipe (5), the inclined conveying pipe (6) and the flow guide groove (7) are included; the filler conveying vertical pipe (1) is fixedly arranged at the end of the aerobic tank; the end of the filler conveying vertical pipe (1) is connected with the start end of the conveying horizontal pipe (3); the end of the conveying horizontal pipe (3) is connected with the start end of the inclined conveying pipe (6); the inclined conveying pipe (6) is arranged in an inclined upward direction, the end of the inclined conveying pipe (6) is connected with the start end of the flow guide groove (7), and the end of the flow guide groove (7) is provided with a water outlet (8); the water outlet (8) is located above the start end of the anoxic section of the biochemical tank; the conveying horizontal pipe (3) is provided with one backwash pipe (4) and one air pipe (5), and the inclined conveying pipe (6) is provided with one air pipe (5); the backwash pipe (4) extends into the conveying horizontal pipe (3) from the position adjacent to the end of the conveying horizontal pipe (3) and is arranged in parallel along the conveying horizontal pipe (3) to the start end of the conveying horizontal pipe (3); the air pipe (5) arranged on the conveying horizontal pipe (3) extends into the conveying horizontal pipe (3) at a position away from the end of the conveying horizontal pipe (3) and is arranged in a horizontal direction inside the conveying horizontal pipe (3) to the start end of the inclined conveying pipe (6); the air pipe (5) arranged on the inclined conveying pipe (6) extends into the inclined conveying pipe (6) and is arranged along the water flow direction in the inclined conveying pipe (6); the parallel arrangement part of the backwash pipe (4) is provided with injection holes (9); one end of the backwash pipe (4) located outside the pipe is connected with a fan; the two air pipes (5) are connected with air-lift fans at the ends located outside the pipes.

2. A fluidization device suitable for use with a long distance backflow MBBR media, according to claim 1, characterized in that, The filler conveying vertical pipe (1) is vertically arranged, and the filler conveying vertical pipe (1) is fixed to the end wall of the aerobic tank by means of pipe clamps.

3. A fluidization device suitable for use with a long distance backflow MBBR media, according to claim 2, characterized in that, The top of the filler conveying vertical pipe (1) is provided with a water suction port (2), and the bottom of the filler conveying vertical pipe (1) extends to the bottom of the aerobic tank.

4. The fluidization device for the long distance backflow MBBR filler according to claim 1, characterized in that, The inclined conveying pipe (6) is a square pipe and is arranged at an angle of 45° with the bottom tank.

5. A fluidization device suitable for use with a long distance backflow MBBR media according to claim 4, characterized in that, The air pipe (5) arranged on the inclined conveying pipe (6) extends into the inclined conveying pipe (6) from the middle part of the inclined conveying pipe (6).

6. A fluidization device suitable for use with a long distance backflow MBBR media according to claim 1, wherein, Two rows of injection holes (9) are arranged in the lower part of the parallel arrangement part of the backwash pipe (4) at an angle of 45°.

7. A fluidization device suitable for use with a long distance backflow MBBR media according to claim 1, characterized in that, The backwash pipe (4) and the air pipe (5) are UPVC pipes.

8. The fluidization device for the long distance backflow MBBR filler according to claim 1, characterized in that, The filler conveying vertical pipe (1) and the conveying horizontal pipe (3) are square pipes.

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