Internal circulation anaerobic expansion fluidized bed

Abstract

The invention discloses an internal circulation anaerobic expanded fluidized bed, which relates to the field of wastewater treatment and comprises an internal circulation anaerobic expanded fluidized bed body, a pulse water distribution tank, a water seal tank, a biogas storage cabinet, a gas collection pipe and a sludge discharge pipe, a separation backflow area, a filler fluidization area, a water collection area and an expansion area are arranged in an inner cavity of the internal circulation anaerobic expansion fluidized bed body, and the internal circulation anaerobic expansion fluidized bed comprises the internal circulation anaerobic expansion fluidized bed body, a pulse water distribution tank, a water seal tank, a biogas storage cabinet, a gas collection pipe and a sludge discharge pipe. The internal circulation anaerobic expanded fluidized bed has high organic treatment load and good impact load resistance, the treatment efficiency of the internal circulation anaerobic expanded fluidized bed can be guaranteed, excellent internal circulation treatment can be achieved during wastewater treatment through the separation backflow area, the filler fluidization area, the water collection area and the expansion area, and the internal circulation anaerobic expanded fluidized bed can be used for treating wastewater. Therefore, the MBBR filler can be fully fluidized and can be fully contacted with wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and in particular to an internal circulation anaerobic expanded fluidized bed. Background Technology

[0002] In the field of wastewater treatment, especially for high-concentration organic wastewater, anaerobic biological treatment technology has attracted widespread attention due to its ability to convert organic matter into biogas and reduce sludge production. Anaerobic expanded fluidized bed reactors, as a highly efficient anaerobic reactor, increase the contact area between microorganisms and wastewater by fluidizing and expanding the packing material within the reactor, thereby improving treatment efficiency. However, existing anaerobic expanded fluidized bed technologies still have many limitations in practical applications.

[0003] First, traditional anaerobic expanded fluidized beds have low organic treatment loads and poor resistance to shock loads. When wastewater concentration or flow rate fluctuates, the microbial community within the reactor is easily impacted, leading to decreased treatment efficiency or even system collapse. This is mainly due to insufficient fluidization of the packing material, inadequate microbial concentration, and an imperfect internal circulation mechanism. In existing technologies, the packing material often cannot achieve efficient internal circulation, and the contact time and area between microorganisms and wastewater are limited, thus restricting the overall performance of the reactor.

[0004] Secondly, the existing anaerobic expanded fluidized bed reactors have low sludge concentrations, affecting treatment efficiency. In traditional designs, although the biogas produced by anaerobic microorganisms on the packing material during the reaction can lift the packing material upwards, the lack of an effective separation and reflux mechanism prevents the microorganisms from fully returning to the reaction zone, resulting in sludge loss or uneven distribution. Furthermore, the unclear division of zones within the reactor (such as the fluidization zone, expansion zone, and separation zone) and the chaotic flow and packing material movement paths further reduce the utilization rate of microorganisms.

[0005] Furthermore, sludge removal is a common problem in existing technologies. During anaerobic treatment, some microorganisms die and detach from the packing material, forming sludge that deposits at the bottom of the reactor. Traditional reactors lack effective sludge scraping and removal devices, leading to sludge accumulation and occupying reaction space. Over long-term operation, this results in a reduction in the effective reactor volume and a decrease in treatment capacity. Although some reactors are equipped with sludge discharge pipes, they often lack a corresponding sludge scraping mechanism, causing sludge to adhere easily to the walls or packing material, making complete removal difficult.

[0006] Furthermore, existing anaerobic expanded fluidized beds have shortcomings in biogas collection and utilization. If biogas is not collected and separated in a timely and effective manner after it is produced, it can lead to unstable fluidization of the packing material and even gas blockage. Traditional reactors typically use simple gas collection hoods and pipelines, but lack pressure regulation mechanisms such as water seals, which can easily cause sewage backflow or biogas leakage, affecting safety and energy recovery efficiency.

[0007] Finally, the existing technology has a relatively simple structural design and fails to fully utilize multi-zone baffles (such as water collection baffles) to optimize water flow and packing movement. For example, the reactor does not have clearly defined water collection zones, expansion zones, packing fluidization zones, and separation and reflux zones, leading to wastewater short-circuiting or insufficient residence time and unsatisfactory treatment results. Furthermore, the fluidization and expansion process of the packing lacks precise control, making it difficult to achieve stable internal circulation.

[0008] Therefore, it is necessary to propose an internal circulation anaerobic expanded fluidized bed to solve the above problems. Summary of the Invention

[0009] The main objective of this invention is to provide an internal circulation anaerobic expanded fluidized bed that can effectively solve the problems in the prior art.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An internal circulation anaerobic expanded fluidized bed includes an internal circulation anaerobic expanded fluidized bed body, a pulse water distribution tank, a water seal tank, a biogas storage tank, a gas collection pipe, and a sludge discharge pipe. A first water collection baffle and a second water collection baffle are installed in the inner cavity of the internal circulation anaerobic expanded fluidized bed body. A scraper is movably connected to the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body. A movable groove is opened at the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body. Waterproof elastic bands are symmetrically installed at both ends of the top of the movable groove. The internal cavity of the internal circulation anaerobic expanded fluidized bed body is provided with a separation reflux zone, a packing fluidization zone, a water collection zone and an expansion zone.

[0011] Preferably, one end of the pulse water distribution tank is equipped with an inlet pipe, and the other end of the pulse water distribution tank is equipped with a delivery pipe. The other end of the delivery pipe is installed at the bottom of the side of the internal circulation anaerobic expanded fluidized bed body and communicates with its inner cavity. Both the inlet pipe and the delivery pipe are flanged and connected to a first solenoid valve.

[0012] Preferably, the gas collecting pipe is installed at the top of the internal circulation anaerobic expanded fluidized bed body, and a gas collecting hood is installed at the top of the internal cavity of the internal circulation anaerobic expanded fluidized bed body. The gas collecting hood communicates with the internal cavity of the gas collecting pipe. The separation and reflux zone is located at the top of the internal cavity of the internal circulation anaerobic expanded fluidized bed body, and the gas collecting hood is located in the separation and reflux zone.

[0013] Preferably, the gas collecting pipe is connected to the water seal box, a gas supply pipe is installed at the top of the gas collecting pipe, the other end of the gas supply pipe is connected to the biogas storage tank, an exhaust pipe is installed on the outer wall of the biogas storage tank, a first air pump is connected to the flange on the outer wall of the gas collecting pipe, and a second solenoid valve is connected to the flange at both the gas supply pipe and the exhaust pipe.

[0014] Preferably, the bottom of the first water collecting baffle is installed at the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body, and the top of the second water collecting baffle is installed at the top of the inner cavity of the internal circulation anaerobic expanded fluidized bed body. Both the top of the first water collecting baffle and the bottom of the second water collecting baffle have gaps with the inner wall of the internal circulation anaerobic expanded fluidized bed body.

[0015] Preferably, the water collection zone is located on the side opposite to the first and second water collection baffles on an adjacent side, and the expansion zone and the packing fluidization zone are located on the side opposite to the first and second water collection baffles on an adjacent side.

[0016] Preferably, the expansion zone is located at the top of the packing fluidization zone, and the inner cavity of the packing fluidization zone is filled with MBBR packing.

[0017] Preferably, the number of the movable troughs is consistent with the number of the packing fluidization zone, the scraper is located at the bottom of the inner cavity of the packing fluidization zone, the two sides of the scraper are attached to the walls of the adjacent internal circulation anaerobic expanded fluidized bed body, the first water collection baffle and the second water collection baffle, and the bottom of the scraper is attached to the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body.

[0018] Preferably, a lead screw is rotatably connected to the inner cavity of the movable trough. The lead screw is driven by a servo motor installed on the outer wall of the inner circulating anaerobic expanded fluidized bed. The bottom of the scraper is movably connected to the inner cavity of the movable trough and threaded to the lead screw. The other end of the waterproof elastic band is connected to the scraper.

[0019] Preferably, the MBBR packing contains anaerobic microorganisms, and the other end of the sludge discharge pipe extends to the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body. A filter screen is installed in the inner cavity of the internal circulation anaerobic expanded fluidized bed body to prevent the MBBR packing from entering.

[0020] Compared with the prior art, the present invention provides an internal circulation anaerobic expanded fluidized bed, which has the following beneficial effects: This internal circulation anaerobic expanded fluidized bed, through the MBBR packing containing anaerobic microorganisms, can fully mix with the high-concentration wastewater entering the inner cavity of the internal circulation anaerobic expanded fluidized bed. The anaerobic microorganisms use organic matter as electron acceptors to decompose the organic matter in the high-concentration wastewater into biogas, carbon dioxide, water, and small molecule organic matter. At this time, a large amount of biogas is generated, which drives the MBBR packing to move to the top of the inner cavity of the internal circulation anaerobic expanded fluidized bed, thus entering the expansion zone and generating an expansion fluidization phenomenon. Therefore, it can further enhance the reaction contact area and contact time, so that the internal circulation anaerobic expanded fluidized bed has extremely high organic treatment load and shock load resistance.

[0021] This internal circulation anaerobic expanded fluidized bed utilizes a separation and reflux zone. After the MBBR packing rises to this point, biogas and excess wastewater from the top are collected via a gas collection pipe and hood. This wastewater is then collected in a water seal tank, which provides pressure and adjusts the water seal level to prevent wastewater from entering the gas supply pipe. Biogas is then pumped into the inner cavity of the biogas storage tank for storage. After the biogas in the inner cavity of the internal circulation anaerobic expanded fluidized bed is discharged, the MBBR packing falls back under gravity, forming an internal sludge circulation. This results in a higher concentration of microorganisms within the internal circulation anaerobic expanded fluidized bed compared to traditional anaerobic systems, thus improving its efficiency. Simultaneously, the treated wastewater is discharged from the effluent pipe.

[0022] In this internal circulation anaerobic expanded fluidized bed, after the anaerobic microorganisms in the high-concentration wastewater die, they detach from the MBBR packing and deposit at the bottom of the internal cavity of the internal circulation anaerobic expanded fluidized bed. The sludge can be discharged through the sludge discharge pipe, thus preventing useless sludge from occupying the space of the internal circulation anaerobic expanded fluidized bed and enabling the internal circulation anaerobic expanded fluidized bed to operate for a long time.

[0023] This internal circulation anaerobic expanded fluidized bed uses a lead screw to drive a scraper, which removes sludge adhering to the bottom of the fluidized bed cavity. This facilitates sludge discharge through the sludge discharge pipe. Furthermore, a waterproof elastic band protects the moving trough from contact between the sludge and the lead screw as the scraper moves, ensuring the scraper functions properly. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the water intake stage of the present invention; Figure 4 This is a schematic diagram of the reaction stage of the present invention; Figure 5 This is a schematic diagram of the separation and reflux structure of the present invention.

[0025] In the diagram: 1. Inlet pipe; 2. Pulse water distribution tank; 3. Water delivery pipe; 4. Internal circulation anaerobic expanded fluidized bed body; 5. Gas collection pipe; 6. Water seal box; 7. Gas delivery pipe; 8. Biogas storage tank; 9. Exhaust pipe; 10. Water outlet pipe; 11. Sludge discharge pipe; 12. Gas collection hood; 13. First water collection baffle; 14. Second water collection baffle; 15. Waterproof elastic band; 16. Screw rod; 17. Sludge scraper; 18. Movable trough; 19. MBBR packing; 20. Expansion zone; 21. Water collection zone; 22. Packing fluidization zone; 23. Separation and reflux zone. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0027] Example 1: like Figures 1-5 As shown, an internal circulation anaerobic expanded fluidized bed includes an internal circulation anaerobic expanded fluidized bed body 4, a pulse water distribution tank 2, a water seal tank 6, a biogas storage tank 8, a gas collection pipe 5, and a sludge discharge pipe 11. A first water collection baffle 13 and a second water collection baffle 14 are installed in the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4. A scraper 17 is movably connected to the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4. An active groove 18 is opened at the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4. Waterproof elastic bands 15 are symmetrically installed at both ends of the top of the active groove 18. The inner cavity of the internal circulation anaerobic expanded fluidized bed body 4 is provided with a separation reflux zone 23, a packing fluidization zone 22, a water collection zone 21 and an expansion zone 20.

[0028] One end of the pulse water distribution tank 2 is equipped with an inlet pipe 1, and the other end of the pulse water distribution tank 2 is equipped with a delivery pipe 3. The other end of the delivery pipe 3 is installed at the bottom of the side of the internal circulation anaerobic expanded fluidized bed body 4 and communicates with its inner cavity. Both the inlet pipe 1 and the delivery pipe 3 are flanged and connected to the first solenoid valve.

[0029] The gas collecting pipe 5 is installed on the top of the internal circulation anaerobic expanded fluidized bed body 4. The top of the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4 is equipped with a gas collecting hood 12, which is connected to the inner cavity of the gas collecting pipe 5. The separation and reflux zone 23 is located at the top of the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4, and the gas collecting hood 12 is located in the separation and reflux zone 23.

[0030] The gas collection pipe 5 is connected to the water seal box 6. A gas delivery pipe 7 is installed on the top of the gas collection pipe 5. The other end of the gas delivery pipe 7 is connected to the biogas storage tank 8. An exhaust pipe 9 is installed on the outer wall of the biogas storage tank 8. A first air pump is connected to the flange on the outer wall of the gas collection pipe 5. A second solenoid valve is connected to the flange at both the gas delivery pipe 7 and the exhaust pipe 9.

[0031] The bottom of the first water collection baffle 13 is installed at the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4, and the top of the second water collection baffle 14 is installed at the top of the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4. Both the top of the first water collection baffle 13 and the bottom of the second water collection baffle 14 have gaps with the inner wall of the internal circulation anaerobic expanded fluidized bed body 4.

[0032] The water collection zone 21 is located on the side opposite to the first water collection baffle 13 and the second water collection baffle 14 on the adjacent side, while the expansion zone 20 and the packing fluidization zone 22 are located on the side opposite to the first water collection baffle 13 and the second water collection baffle 14 on the adjacent side.

[0033] The expansion zone 20 is located at the top of the packing fluidization zone 22, and the inner cavity of the packing fluidization zone 22 is filled with MBBR packing 19.

[0034] The number of active troughs 18 is the same as that of the packing fluidization zone 22. The scraper 17 is located at the bottom of the inner cavity of the packing fluidization zone 22. The two sides of the scraper 17 are attached to the walls of the adjacent internal circulation anaerobic expansion fluidized bed body 4, the first water collection baffle 13 and the second water collection baffle 14. The bottom of the scraper 17 is attached to the bottom of the inner cavity of the internal circulation anaerobic expansion fluidized bed body 4.

[0035] A lead screw 16 is rotatably connected in the inner cavity of the movable trough 18. The lead screw 16 is driven by a servo motor installed on the outer wall of the inner circulation anaerobic expanded fluidized bed body 4. The bottom of the scraper 17 is movably connected in the inner cavity of the movable trough 18 and threadedly connected to the lead screw 16. The other end of the waterproof elastic band 15 is connected to the scraper 17.

[0036] MBBR packing 19 contains anaerobic microorganisms. The other end of the sludge discharge pipe 11 extends to the bottom of the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4. The sludge discharge pipe 11 is equipped with a filter screen in the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4 to prevent MBBR packing 19 from entering.

[0037] Example 2: like Figure 3 As shown, an internal circulation anaerobic expanded fluidized bed is described. The internal circulation anaerobic expanded fluidized bed body 4 is in the water inlet stage. At this time, high-concentration wastewater enters the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4 through the water inlet pipe 1, the pulse water distribution tank 2 and the water delivery pipe 3, and mixes with the MBBR packing 19 in the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4.

[0038] Example 3: like Figure 4 As shown, an internal circulation anaerobic expanded fluidized bed (MBBR) is described. The main body 4 of the internal circulation anaerobic expanded fluidized bed is the reaction stage. The anaerobic microorganisms in the MBBR packing 19 use organic matter as an electron acceptor to decompose the organic matter in the wastewater into biogas, carbon dioxide, water, and small molecule organic matter. This reaction stage will generate a large amount of biogas, which will drive the MBBR packing 19 to flow upward to the expansion zone 20. At this time, the expansion fluidization phenomenon will occur, thereby further enhancing the contact area and contact time between the MBBR packing 19 and the wastewater.

[0039] Example 4: like Figure 5As shown, an internal circulation anaerobic expanded fluidized bed is described. The internal circulation anaerobic expanded fluidized bed body 4 is in the separation and reflux stage. At this time, the MBBR packing 19 reaches the packing fluidization zone 22. Biogas is collected into the water seal box 6 through the gas collection hood 12 and the gas collection pipe 5. After being processed by the water seal box 6, it is collected into the biogas storage tank 8. After the biogas is discharged from the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4, the MBBR packing 19 can fall back down by gravity, thereby forming an internal circulation of sludge in the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4, which can effectively improve the reaction efficiency of the internal circulation anaerobic expanded fluidized bed body 4. The first water collection baffle 13 and the second water collection baffle 14 divide the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4 into multiple expansion zones 20, water collection zones 21, packing fluidized zones 22 and separation and reflux zones 23, so that wastewater can be circulated and treated in each expansion zone 20, water collection zone 21, packing fluidized zone 22 and separation and reflux zone 23 in sequence, and the treated wastewater can be discharged through the effluent pipe 10. After starting the lead screw 16 and driving the scraper 17, the sludge can be discharged through the sludge discharge pipe 11.

[0040] It should be noted that this invention is an internal circulation anaerobic expanded fluidized bed. In use, high-concentration wastewater is injected into the pulse distribution tank 2 through the inlet pipe 1. The pulse distribution tank 2 then feeds the wastewater into the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4 through the water supply pipe 3. At this time, the wastewater is located in the first expansion zone 20, the water collection zone 21, the packing fluidization zone 22, and the separation and return zone 23. The wastewater comes into contact with and mixes with the MBBR packing 19. The MBBR packing 19 containing anaerobic microorganisms uses organic matter as an electron acceptor to decompose the organic matter in the wastewater into biogas, carbon dioxide, water, and small molecule organic matter. At this time, a large amount of biogas is generated, which in turn drives the MBBR packing 19 to flow upward to the expansion zone 20, thereby producing an expansion fluidization phenomenon, which is used to enhance the contact area and contact time between the MBBR packing 19 and the wastewater. MBBR packing 19 rises further to the packing fluidization zone 22, and biogas is collected into biogas storage tank 8 through gas collection hood 12, gas collection pipe 5, and water seal box 6. After the biogas is discharged from the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4, MBBR packing 19 falls back down by gravity, thus forming sludge internal circulation in the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4. After being treated by the first set of expansion zone 20, water collection zone 21, packing fluidized zone 22 and separation reflux zone 23, the wastewater enters the next set of expansion zone 20, water collection zone 21, packing fluidized zone 22 and separation reflux zone 23 through the adjacent water collection zone 21. At this time, the wastewater treatment steps of the first set are repeated until the wastewater flows through all the expansion zones 20, water collection zone 21, packing fluidized zone 22 and separation reflux zone 23 in the inner cavity of the internal circulation anaerobic expanded fluidized bed body 4. After the sludge is discharged through the sludge discharge pipe 11, it can be discharged through the water outlet pipe 10.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An internal circulation anaerobic expanded fluidized bed, comprising an internal circulation anaerobic expanded fluidized bed body (4), a pulse water distribution tank (2), a water seal tank (6), a biogas storage tank (8), a gas collecting pipe (5) and a sludge discharge pipe (11), characterized in that: The first water collecting baffle (13) and the second water collecting baffle (14) are arranged in the inner cavity of the inner circulation anaerobic expanded fluidized bed body (4). The inner cavity of the inner circulation anaerobic expanded fluidized bed body (4) is movably connected with a mud scraping plate (17), and the bottom of the inner cavity of the inner circulation anaerobic expanded fluidized bed body (4) is provided with a movable groove (18), and the top of the inner cavity of the movable groove (18) is symmetrically provided with waterproof elastic belts (15) at both ends. The inner cavity of the inner circulation anaerobic expanded fluidized bed body (4) is provided with a separation backflow area (23), a filler fluidization area (22), a water collecting area (21) and an expansion area (20).

2. An internally circulating, anaerobic, expanded fluidized bed according to claim 1, characterized in that: One end of the pulse water distribution box (2) is provided with a water inlet pipe (1), and the other end of the pulse water distribution box (2) is provided with a water outlet pipe (3), and the other end of the water outlet pipe (3) is arranged at the bottom of the side of the inner circulation anaerobic expanded fluidized bed body (4) and communicates with the inner cavity thereof, and the water inlet pipe (1) and the water outlet pipe (3) are flange-connected with first electromagnetic valves.

3. An internally circulating, anaerobic, expanded fluidized bed according to claim 1, characterized in that: The gas collecting pipe (5) is arranged at the top of the inner circulation anaerobic expanded fluidized bed body (4), the top of the inner cavity of the inner circulation anaerobic expanded fluidized bed body (4) is provided with a gas collecting cover (12), the gas collecting cover (12) communicates with the inner cavity of the gas collecting pipe (5), the separation backflow area (23) is located at the top of the inner cavity of the inner circulation anaerobic expanded fluidized bed body (4), and the gas collecting cover (12) is located in the separation backflow area (23).

4. An internally circulating full-scale anaerobic expanded fluidized bed according to claim 3, characterized in that: The gas collecting pipe (5) is connected with the water seal box (6), the top of the gas collecting pipe (5) is provided with a gas outlet pipe (7), the other end of the gas outlet pipe (7) is connected with a biogas storage cabinet (8), the outer wall of the biogas storage cabinet (8) is provided with an exhaust pipe (9), the outer wall of the gas collecting pipe (5) is flange-connected with a first air pump, and the gas outlet pipe (7) and the exhaust pipe (9) are flange-connected with second electromagnetic valves.

5. An internally circulating, anaerobic, expanded fluidized bed according to claim 1, characterized in that: The bottom of the first water collecting baffle (13) is arranged at the bottom of the inner cavity of the inner circulation anaerobic expanded fluidized bed body (4), the top of the second water collecting baffle (14) is arranged at the top of the inner cavity of the inner circulation anaerobic expanded fluidized bed body (4), and the top of the first water collecting baffle (13) and the bottom of the second water collecting baffle (14) are spaced apart from the inner wall of the inner circulation anaerobic expanded fluidized bed body (4).

6. An internally circulating full-scale expanded fluidized bed according to claim 1, characterized in that: The water collecting area (21) is arranged on the side opposite to the side where the first water collecting baffle (13) and the second water collecting baffle (14) are located, and the expansion area (20) and the filler fluidization area (22) are arranged on the side opposite to the side where the first water collecting baffle (13) and the second water collecting baffle (14) are located.

7. An internally circulating full-scale anaerobic expanded fluidized bed according to claim 6, characterized in that: The expansion area (20) is located at the top of the filler fluidization area (22), and the inner cavity of the filler fluidization area (22) is filled with MBBR filler (19).

8. An internally circulating full-scale expanded fluidized bed according to claim 1, characterized in that: The number of the movable groove (18) is consistent with the filler fluidization area (22), the mud scraper (17) is located at the bottom of the inner cavity of the filler fluidization area (22), the two sides of the mud scraper (17) are attached to the wall of the inner circulating anaerobic expanded fluidized bed body (4), the first water collecting baffle (13) and the second water collecting baffle (14) adjacent to the mud scraper (17), and the bottom of the mud scraper (17) is attached to the bottom of the inner cavity of the inner circulating anaerobic expanded fluidized bed body (4).

9. An internally circulating full-scale anaerobic expanded fluidized bed according to claim 8, characterized in that: The inner cavity of the movable groove (18) is rotationally connected with a lead screw (16), the lead screw (16) is driven by a servo motor installed on the outer wall of the inner circulating anaerobic expanded fluidized bed body (4), the bottom of the mud scraper (17) is movably connected in the inner cavity of the movable groove (18) and is threadedly connected with the lead screw (16), and the other end of the waterproof elastic belt (15) is connected with the mud scraper (17).

10. An internally circulating full-scale expanded fluidized bed according to claim 1, characterized in that: The MBBR filler (19) contains anaerobic microorganisms, the other end of the sludge discharge pipe (11) extends to the bottom of the inner cavity of the inner circulating anaerobic expanded fluidized bed body (4), and the sludge discharge pipe (11) is provided with a filter screen in the inner cavity of the inner circulating anaerobic expanded fluidized bed body (4) for preventing the MBBR filler (19) from entering.

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