Micro-aerobic fluidized bed biological membrane system for printing and dyeing wastewater treatment

Abstract

The invention discloses a micro-aerobic fluidized bed biological membrane system for printing and dyeing wastewater treatment, and belongs to the technical field of wastewater treatment, the micro-aerobic fluidized bed biological membrane system comprises a tank cylinder, an outer cylinder seat is fixed on the lower end surface of the tank cylinder, and a frame is mounted on the periphery of the outer cylinder seat; the water supply pipe is vertically connected right above the tank barrel, and the water supply pipe continuously conveys the printing and dyeing wastewater into the tank barrel; the oxygen supply channel is formed in the side wall of the outer cylinder seat, an oxygen supply pipe is horizontally connected in the oxygen supply channel, and one end of the oxygen supply pipe is communicated with an oxygen pump through a ball valve; the flow meter is arranged between the oxygen feeding pipe and the ball valve and is used for monitoring the oxygen flow; the biological fluidized bed unit is vertically arranged in the tank barrel, and the biological fluidized bed unit is used for biodegrading the printing and dyeing wastewater subjected to primary treatment; the filling density of the suspended filler can be adjusted in real time based on water quality change fluctuation of the printing and dyeing wastewater, it is guaranteed that the biological fluidized bed unit is always in the optimal fluidized state, and the printing and dyeing wastewater treatment effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, in particular to a micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater. Background Art

[0002] Printing and dyeing wastewater, as an important component of industrial wastewater, has the characteristics of large water volume, high organic concentration, complex composition, high chromaticity, and three-hazard toxicity. Its effective treatment is of great value to protecting surface water environmental pollution and safety. The newer fluidized bed biofilm can degrade organic matter in wastewater by cultivating biofilm in a fluidized bed, and has a good removal effect on difficult-to-degrade organic matter. However, the fluidized bed biofilm system in the prior art, such as the invention patent with publication number CN114162968A, adopts a stirring method to make the modified polyurethane sponge carrier completely contact with the wastewater. Although it can improve the sewage treatment effect to a certain extent, the single flow channel and the single-level polyurethane sponge carrier used only have a general treatment effect on printing and dyeing wastewater containing pollutants of various particle sizes. In addition, the polyurethane sponge carrier is easy to gather and disperse in the reactor, resulting in uneven distribution of microorganisms on the carrier surface, causing some areas to form thicker biofilms, while other areas are relatively thin. In particular, as the water quality of printing and dyeing wastewater changes and fluctuates, the system cannot quickly adjust to adapt to the conditions of the new water quality, which greatly affects the wastewater treatment effect. Therefore, it is necessary to provide a micro-oxygen fluidized bed biofilm system for printing and dyeing wastewater treatment to solve the problems raised in the above background technology. Summary of the invention

[0003] To achieve the above object, the present invention provides the following technical solution: a micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater, comprising:

[0004] The tank barrel has an outer barrel seat fixed on its lower end surface, and a frame is installed on the periphery of the outer barrel seat;

[0005] A water delivery pipe is vertically connected to the top of the tank barrel, and the water delivery pipe continuously delivers the printing and dyeing wastewater into the tank barrel;

[0006] An oxygen supply channel is provided on the side wall of the outer cylinder seat, an oxygen supply pipe is horizontally connected in the oxygen supply channel, and one end of the oxygen supply pipe is connected to the oxygen pump through a ball valve;

[0007] A flow meter, installed between the oxygen delivery pipe and the ball valve, for monitoring the oxygen flow;

[0008] A biological fluidized bed unit is vertically arranged in the tank barrel, and the biological fluidized bed unit is used to biodegrade the printing and dyeing wastewater that has been preliminarily treated; a drainage pipe is vertically connected to the lower middle part of the biological fluidized bed unit, a drainage channel is provided on the outer cylinder seat, and the other end of the drainage pipe is connected to the drainage channel;

[0009] An oxygen supply mechanism is arranged in the outer cylinder seat and is located below the biological fluidized bed unit, and the oxygen supply mechanism is connected to the biological fluidized bed unit through a plurality of air supply pipes;

[0010] The biological fluidized bed unit comprises:

[0011] A cylinder body is coaxially fixed in the tank barrel. The cylinder bodies are three cocentrically distributed. The three cylinder bodies are sealed together to form two inner ring bins. The cylinder body located outside is sealed together with the tank barrel to form an outer ring bin.

[0012] The first-stage suspended filler, the second-stage suspended filler, and the third-stage suspended filler are distributed in the outer ring bin and the two inner ring bins from the outside to the inside;

[0013] A drainage hole is provided on the side wall of each of the cylinders, and the outer ring bin and the two inner ring bins are connected to each other through the drainage hole;

[0014] A water supply seat is installed above the cylinder, the lower end of the water supply pipe is sealed and connected to the water supply seat, the water supply seat is connected to the outer ring bin; and the drainage pipe is connected to the cylinder located at the innermost part;

[0015] The regulating mechanism is arranged on each of the cylinders. The regulating mechanism adjusts the filling density of the primary suspended filler, the secondary suspended filler and the tertiary suspended filler outside the cylinder based on the water quality change of the printing and dyeing wastewater, so that the biological fluidized bed unit always maintains the best fluidized state.

[0016] Preferably, the oxygen delivery mechanism comprises:

[0017] A vortex chamber is fixed in the outer cylinder seat, and the air inlet end of the vortex chamber is connected to the oxygen delivery pipe;

[0018] An inner ring wall, the center of which is arranged in the vortex cavity, and a plurality of holes are opened on the circumference of the inner ring wall;

[0019] An upper airflow disk is coaxially arranged above the vortex chamber, and an opening is opened on the upper end surface of the vortex chamber in the middle of the inner ring wall, and the upper airflow disk is connected to the vortex chamber through the opening;

[0020] An annular tube is arranged corresponding to each of the cylinders, and the annular tube is arranged in the tank barrel and below each of the cylinders;

[0021] There are multiple connecting pipes distributed in a circle, one end of each connecting pipe is connected to the ring pipe, and the other end is connected to the upper airflow disk; the cross-section of the air supply pipe is an L-shaped structure, one end of the air supply pipe is connected to the ring pipe, and the other end of the air supply pipe is arranged parallel to the outer circumference of the cylinder.

[0022] Preferably, each of the cylinders is vertically provided with an exhaust port corresponding to the air supply pipe, and the exhaust port is used to discharge excess oxygen.

[0023] Preferably, a vortex chamber is sealed and connected below the water delivery seat, a middle channel is vertically arranged in the middle of the vortex chamber, an annular cavity is arranged below the vortex chamber, the middle channel is connected with the annular cavity through a plurality of side holes, a plurality of water delivery holes are distributed on the lower end surface of the annular cavity, and each of the water delivery holes is connected with the outer cylinder through a gap.

[0024] Preferably, a plurality of partition plates are vertically fixed on the side wall of the cylinder, and the partition plates divide the side wall of the cylinder into a plurality of flow channels, and the flow channels are arranged in one-to-one correspondence with the gap channels;

[0025] A baffle is also vertically fixed on the side wall of the cylinder, the baffle is staggered with the partition plate, and the gap and the drainage hole are both arranged in the flow channel and located on both sides of the baffle;

[0026] A sealing plate is slidably connected below each baffle plate, and a water guide hole is opened at the lower end of the sealing plate.

[0027] Preferably, the adjustment mechanism comprises:

[0028] The baffles are multiple and circumferentially distributed, each of the baffles is slidably connected in the flow channel, the air supply pipes in the oxygen supply mechanism are connected to the baffles, and the lower end of the sealing plate is fixed to the middle of the baffle;

[0029] A slide bar is vertically fixed at the lower end of each of the spoilers, and each of the slide bars is slidably connected to the cylinder;

[0030] A fixing ring is coaxially arranged below the cylinder, and the lower end of the sliding rod is fixed to the fixing ring.

[0031] Preferably, the printing and dyeing wastewater enters the corresponding flow channel through each of the gaps, flows downward, passes through the water guide holes, then flows back upward, and is finally discharged from the drainage holes.

[0032] Preferably, a push plate corresponding to the cylinder body is provided in the outer cylinder seat, and each push plate is arranged concentrically. A plurality of telescopic parts are fixed in the outer cylinder seat, and the output end of each telescopic part is connected to the push plate, and the upper end of the push plate is connected to each fixed ring through a connecting rod.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The three cylinders and the tank barrel used in the present invention cooperate with each other to form an outer ring bin and two inner ring bins, and the outer ring bin and the two inner ring bins are filled with primary suspended fillers, secondary suspended fillers, and tertiary suspended fillers in sequence, so as to form a multi-stage treatment of wastewater, and different levels of suspended fillers can form a diverse microenvironment, which is conducive to the growth and reproduction of various microorganisms. A regulating mechanism is also provided to adjust the filling density of the corresponding suspended fillers in the outer ring bin and the two inner ring bins in real time based on the fluctuation of the water quality of the printing and dyeing wastewater. On the one hand, it ensures that the biological fluidized bed unit is always in the best fluidized state, avoiding local accumulation or excessive gaps, and on the other hand, it can help to form a uniform and efficient biofilm and improve the removal rate of various pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0037] Figure 3 It is a cross-sectional schematic diagram of the outer ring bin and the inner ring bin in the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the outermost cylinder in the present invention;

[0039] Figure 5 It is a structural schematic diagram of the oxygen delivery mechanism in the present invention;

[0040] Figure 6 It is a structural schematic diagram of the adjustment mechanism in the present invention;

[0041] Figure 7 It is a structural schematic diagram of the telescopic part and the push plate in the present invention;

[0042] In the figure: 1, tank cylinder; 11, water supply pipe; 12, drainage pipe; 2, outer cylinder seat; 21, frame; 22, oxygen supply channel; 23, oxygen supply pipe; 24, ball valve; 25, oxygen pump; 26, flow meter; 27, drainage channel; 3, biological fluidized bed unit; 31, cylinder; 32, outer ring bin; 33, drainage hole; 34, partition plate; 35, baffle; 36, sealing plate; 37, water guide hole; 4, oxygen supply mechanism; 41, vortex chamber; 42, channel; 43, upper air flow plate; 44, ring pipe; 45, connecting pipe; 46, air supply pipe; 5, water supply seat; 51, vortex bin; 52, middle channel; 53, water supply hole; 54, gap channel; 6, adjustment mechanism; 61, baffle; 62, slide rod; 63, fixing ring; 64, push plate; 65, telescopic part; 66, connecting rod. DETAILED DESCRIPTION

[0043] See also Figure 1-Figure 7In an embodiment of the present invention, a micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater comprises:

[0044] The tank barrel 1 has an outer barrel seat 2 fixed to its lower end surface, and a frame 21 is installed on the periphery of the outer barrel seat 2;

[0045] A water delivery pipe 11 is vertically connected to the top of the tank barrel 1, and the water delivery pipe 11 continuously delivers the printing and dyeing wastewater to the tank barrel 1;

[0046] The oxygen supply channel 22 is provided on the side wall of the outer cylinder seat 2. An oxygen supply pipe 23 is horizontally connected to the oxygen supply channel 22. One end of the oxygen supply pipe 23 is connected to the oxygen pump 25 through a ball valve 24. By adjusting the opening of the ball valve 24, the amount of oxygen entering the system can be accurately controlled to adapt to different water quality conditions and treatment requirements, ensure sufficient dissolved oxygen supply, support the growth and activity of aerobic microorganisms, and effectively degrade organic matter in printing and dyeing wastewater.

[0047] A flow meter 26, installed between the oxygen delivery pipe 23 and the ball valve 24, for monitoring the oxygen flow;

[0048] The biological fluidized bed unit 3 is vertically arranged in the tank 1, and is used for biodegrading the printing and dyeing wastewater that has been preliminarily treated (the preliminarily treated printing and dyeing wastewater mainly uses a grid or a screen to remove large particles in the wastewater to prevent these substances from causing subsequent blockage); a drain pipe 12 is vertically connected to the lower middle part of the biological fluidized bed unit 3, and a drain channel 27 is provided on the outer cylinder seat 2, and the other end of the drain pipe 12 is connected to the drain channel 27; thereby, the treated printing and dyeing wastewater is discharged through the drain channel 27;

[0049] The oxygen supply mechanism 4 is arranged in the outer cylinder seat 2 and is located below the biological fluidized bed unit 3. The oxygen supply mechanism 4 is connected to the biological fluidized bed unit 3 through a plurality of air supply pipes 46.

[0050] The biological fluidized bed unit 3 comprises:

[0051] The cylinder 31 is coaxially fixed in the tank barrel 1. The cylinders 31 are three cocentrically distributed. The three cylinders 31 are sealed together to form two inner ring bins. The cylinder 31 located outside is sealed together with the tank barrel 1 to form an outer ring bin 32.

[0052] The first-stage suspended filler, the second-stage suspended filler, and the third-stage suspended filler are sequentially distributed in the outer ring bin 32 and the two inner ring bins from the outside to the inside; a layer of biofilm is formed on the surface of the suspended filler, and part of the organic matter is degraded through the metabolism of microorganisms;

[0053] The drainage holes 33 are provided on the side walls of the cylinders 31, and the outer ring bin 32 and the two inner ring bins are connected to each other through the drainage holes 33; after entering the outer ring bin 32, the printing and dyeing wastewater can enter the two inner ring bins in sequence through the drainage holes 33 on the cylinder 31, so that the organic matter in the printing and dyeing wastewater is degraded by the primary suspended filler, the secondary suspended filler, and the tertiary suspended filler respectively;

[0054] The water supply seat 5 is installed above the cylinder 31, the lower end of the water supply pipe 11 is sealed and connected to the water supply seat 5, the water supply seat 5 is connected to the outer ring bin 32; and the drainage pipe 12 is connected to the cylinder 31 located at the innermost part;

[0055] The regulating mechanism 6 is arranged on each of the cylinders 31. The regulating mechanism 6 adjusts the filling density of the primary suspended filler, the secondary suspended filler and the tertiary suspended filler outside the cylinder based on the water quality changes of the printing and dyeing wastewater, so that the biological fluidized bed unit 3 always maintains the optimal fluidized state, so as to expand the contact effect between the pollutants in the wastewater and the biofilm on the surface of the filler in the biological fluidized bed unit 3, thereby improving the mass transfer efficiency and degradation rate; and through dynamic adjustment, the system can better cope with different water quality conditions and ensure stable treatment effects; compared with traditional technologies, the present invention can quickly respond to changes in influent water quality, ensure efficient operation under different conditions, and can be applicable to various types of wastewater treatment, especially printing and dyeing wastewater with complex components and large water quality fluctuations.

[0056] In this embodiment, the oxygen delivery mechanism 4 includes:

[0057] A vortex chamber 41 is fixed in the outer cylinder seat 2, and an air inlet end of the vortex chamber 41 is connected to the oxygen delivery pipe 23;

[0058] An inner ring wall, the center of which is arranged in the vortex cavity 41, and a plurality of holes 42 are opened on the circumference of the inner ring wall;

[0059] The upper airflow disk 43 is coaxially arranged above the vortex chamber 41. The upper end surface of the vortex chamber 41 is located in the middle of the inner ring wall and has a through opening. The upper airflow disk 43 is connected to the vortex chamber 41 through the through opening, so that the vortex chamber 41 can evenly transport oxygen to the upper airflow disk 43.

[0060] The annular tube 44 is provided corresponding to each of the cylinders 31, and the annular tube 44 is provided in the tank 1 below each of the cylinders 31;

[0061] There are multiple connecting pipes 45 distributed in a circle, one end of each connecting pipe 45 is connected to the ring pipe 44, and the other end is connected to the upper airflow disk 43; the cross-section of the air supply pipe 46 is an L-shaped structure, one end of the air supply pipe 46 is connected to the ring pipe 44, and the other end of the air supply pipe 46 is arranged in parallel on the outer circumference of the cylinder 31, that is, the oxygen in the upper airflow disk 43 can enter the ring pipe 44 through each connecting pipe 45 in turn, and the oxygen flowing in the ring pipe 44 can be evenly discharged through the air supply pipes 46 respectively.

[0062] As a preferred embodiment, each of the cylinders 31 is vertically provided with an exhaust port (not shown in the figure) corresponding to the air supply pipe 46, and the exhaust port is used to discharge excess oxygen.

[0063] In this embodiment, a vortex chamber 51 is sealed and connected below the water supply seat 5, a middle channel 52 is vertically arranged in the middle of the vortex chamber 51, an annular cavity is arranged below the vortex chamber 51, the middle channel 52 is connected with the annular cavity through a plurality of side holes, a plurality of water supply holes 53 are distributed on the lower end surface of the annular cavity, each of the water supply holes 53 is connected with the outer cylinder 31 through a gap 54, thereby ensuring that the printing and dyeing wastewater can enter the tank tube 1 through each water supply hole 53 respectively.

[0064] In this embodiment, a plurality of partition plates 34 are vertically fixed on the side wall of the cylinder 31, and the partition plates 34 divide the side wall of the cylinder 31 into a plurality of flow channels, and the flow channels are arranged one by one with the gaps 54; that is, the printing and dyeing wastewater can flow through the plurality of gaps 54 and be divided into a plurality of flow branches, and the printing and dyeing wastewater of each flow branch enters each flow channel accordingly;

[0065] A baffle 35 is also vertically fixed on the side wall of the cylinder 31, and the baffle 35 is staggered with the partition plate 34, and the gap 54 and the drainage hole 33 are both arranged in the flow channel and located on both sides of the baffle 35;

[0066] A sealing plate 36 is slidably connected to the lower side of each baffle plate 35 , and a water guide hole 37 is formed at the lower end of the sealing plate 36 .

[0067] In this embodiment, the adjustment mechanism 6 includes:

[0068] The baffles 61 are multiple and circumferentially distributed, each of the baffles 61 is slidably connected in the flow channel, the air supply pipes 46 in the oxygen supply mechanism 4 are connected to the baffles 61 (wherein the air supply pipes 46 can be telescopic hoses or bellows), and the lower end of the sealing plate 36 is fixed to the middle of the baffle 61;

[0069] A slide bar 62 is vertically fixed to the lower end of each of the spoiler plates 61, and each of the slide bars 62 is slidably connected to the cylinder 31;

[0070] The fixing ring 63 is coaxially arranged below the cylinder 31, and the lower end of the sliding rod 62 is fixed to the fixing ring 63. When the baffle plate 61 slides upward, the effective volume of the flow channel decreases, so that the filling density of the suspended filler in the flow channel gradually increases. Therefore, by controlling the position of the baffle plate 61, the filling density of the suspended filler can be finely adjusted to adapt to different water quality conditions, and the first-level suspended filler, the second-level suspended filler, and the third-level suspended filler can independently change the filling density. Each level of filler can maintain the optimal fluidized state, improve the mass transfer efficiency, and accelerate the degradation rate of pollutants.

[0071] As a preferred embodiment, the printing and dyeing wastewater enters the corresponding flow channel through each of the gaps 54, flows downward, flows back upward through the water guide hole 37, and is finally discharged from the drainage hole 33, wherein the baffle 35 and the sealing plate 36 on the outer cylinder 31 are both sealed in contact with the inner wall of the tank barrel 1.

[0072] In this embodiment, a push plate 64 corresponding to the cylinder body 31 is provided in the outer cylinder seat 2, and each of the push plates 64 is arranged concentrically. A plurality of telescopic parts 65 are fixed in the outer cylinder seat 2, and the output end of each telescopic part 65 is connected to the push plate 64. The upper end of each push plate 64 is connected to each of the fixed rings 63 through a connecting rod 66, that is, the push plate 64 is slid up and down by the telescopic adjustment effect of each telescopic part 65, so that the corresponding fixed ring 63 can move up and down synchronously therewith, thereby changing the filling density of the suspended filler outside each cylinder body 31.

[0073] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater, characterized in that: It includes: A canister (1) having an outer canister seat (2) fixed to its lower end surface, and a frame (21) mounted on the periphery of the outer canister seat (2); A water supply pipe (11) is vertically connected to the top of the tank barrel (1); An oxygen supply channel (22) is provided on the side wall of the outer cylinder seat (2), an oxygen supply pipe (23) is horizontally connected to the oxygen supply channel (22), and one end of the oxygen supply pipe (23) is connected to an oxygen pump (25) via a ball valve (24); A flow meter (26) installed between the oxygen supply pipe (23) and the ball valve (24); The biological fluidized bed unit (3) is vertically arranged in the tank (1); a drainage pipe (12) is vertically connected to the lower middle portion of the biological fluidized bed unit (3); a drainage channel (27) is provided on the outer cylinder seat (2); and the other end of the drainage pipe (12) is connected to the drainage channel (27); The oxygen supply mechanism (4) is arranged in the outer cylinder seat (2) and is located below the biological fluidized bed unit (3); the oxygen supply mechanism (4) is connected to the biological fluidized bed unit (3) via a plurality of air supply pipes (46).

2. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 1, characterized in that: The biological fluidized bed unit (3) comprises: A cylinder (31) is coaxially fixed in the tank barrel (1), the cylinders (31) are three coaxially distributed, the three cylinders (31) are sealed together to form two inner ring chambers, and the cylinder (31) located outside is sealed together with the tank barrel (1) to form an outer ring chamber (32); The primary suspended filler, the secondary suspended filler, and the tertiary suspended filler are sequentially distributed in the outer ring bin (32) and the two inner ring bins from the outside to the inside; A drainage hole (33) is formed on the side wall of each of the cylinders (31); the outer ring bin (32) and the two inner ring bins are connected to each other via the drainage hole (33); A water supply seat (5) is installed above the cylinder (31); the lower end of the water supply pipe (11) is sealedly connected to the water supply seat (5); the water supply seat (5) is connected to the outer ring bin (32); and the drainage pipe (12) is connected to the cylinder (31) located at the innermost part; An adjusting mechanism (6) is arranged on each of the cylinders (31), and the adjusting mechanism (6) adjusts the filling density of the primary suspended filler, the secondary suspended filler, and the tertiary suspended filler outside the cylinder.

3. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 2, characterized in that: The oxygen delivery mechanism (4) comprises: A vortex chamber (41) is fixed in the outer cylinder seat (2), and an air inlet end of the vortex chamber (41) is connected to the oxygen supply pipe (23); An inner annular wall, the center of which is arranged in the vortex cavity (41), and a plurality of holes (42) are opened on the circumference of the inner annular wall; An upper airflow disk (43) is coaxially arranged above the vortex chamber (41); an upper end surface of the vortex chamber (41) is provided with a through opening in the middle of the inner ring wall; the upper airflow disk (43) is connected to the vortex chamber (41) through the through opening; an annular tube (44) disposed corresponding to each of the cylinders (31); the annular tube (44) is disposed inside the tank barrel (1) and below each of the cylinders (31); The connecting pipes (45) are multiple and distributed around the circumference, one end of each connecting pipe (45) is connected to the annular pipe (44), and the other end is connected to the upper airflow disk (43); the cross section of the air supply pipe (46) is an L-shaped structure, one end of the air supply pipe (46) is connected to the annular pipe (44), and the other end of the air supply pipe (46) is arranged parallel to the outer circumference of the cylinder (31).

4. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 3, characterized in that: Each of the cylinders (31) is vertically provided with an exhaust port corresponding to the air supply pipe (46).

5. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 2, characterized in that: A vortex chamber (51) is sealedly connected below the water supply seat (5), a middle channel (52) is vertically arranged in the middle of the vortex chamber (51), an annular cavity is arranged below the vortex chamber (51), the middle channel (52) is connected to the annular cavity through a plurality of side holes, a plurality of water supply holes (53) are distributed on the lower end surface of the annular cavity, and each of the water supply holes (53) is connected to the outer cylinder (31) through a gap channel (54).

6. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 5, characterized in that: A plurality of partition plates (34) are vertically fixed on the side walls of the cylinder (31), the partition plates (34) dividing the side walls of the cylinder (31) into a plurality of flow channels, the flow channels being arranged in one-to-one correspondence with the gap channels (54); A baffle (35) is also vertically fixed on the side wall of the cylinder (31), the baffle (35) and the partition plate (34) are staggered, and the gap (54) and the drainage hole (33) are both arranged in the flow channel and located on both sides of the baffle (35); A sealing plate (36) is slidably connected below each baffle plate (35), and a water guide hole (37) is provided at the lower end of the sealing plate (36).

7. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 6, characterized in that: The regulating mechanism (6) comprises: The baffles (61) are multiple and circumferentially distributed, each of the baffles (61) is slidably connected in the flow channel, the air supply pipes (46) in the oxygen supply mechanism (4) are connected to the baffles (61), and the lower end of the sealing plate (36) is fixed to the middle of the baffle (61); A sliding rod (62) is vertically fixed to the lower end of each of the baffles (61), and each of the sliding rods (62) is slidably connected to the cylinder (31); A fixing ring (63) is coaxially arranged below the cylinder (31), and the lower end of the sliding rod (62) is fixed to the fixing ring (63).

8. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 7, characterized in that: The printing and dyeing wastewater enters the corresponding flow channel through each of the gaps (54), flows downward, passes through the water guide holes (37), then flows back upward, and is finally discharged through the drainage holes (33).

9. The micro-oxygen fluidized bed biofilm system for treating printing and dyeing wastewater according to claim 7, characterized in that: A push plate (64) corresponding to the cylinder body (31) is provided in the outer cylinder seat (2), and the push plates (64) are arranged concentrically. A plurality of telescopic parts (65) are fixed in the outer cylinder seat (2), and the output end of each telescopic part (65) is connected to the push plate (64). The upper end of each push plate (64) is connected to each fixed ring (63) via a connecting rod (66).

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