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

Abstract

The application discloses a kind of micro-aerobic fluidized bed biofilm systems of printing and dyeing wastewater treatment, belong to wastewater treatment technical field, it includes: jar cylinder, lower end surface is fixed with outer cylinder base, outer cylinder base is installed with frame on the periphery;Water pipe is vertically connected in the upper of jar cylinder, water pipe continuously transports printing and dyeing wastewater to jar cylinder;Oxygen supply channel is opened in the side wall of outer cylinder base, oxygen supply channel is horizontally connected with oxygen supply pipe in, and one end of oxygen supply pipe is communicated with oxygen pump by ball valve;Flow meter is installed between oxygen supply pipe and the ball valve, for monitoring oxygen flow;Biological fluidized bed unit is vertically arranged in jar cylinder, and biological fluidized bed unit is used for biological degradation to the printing and dyeing wastewater after preliminary treatment;The application can be based on the water quality change fluctuation of printing and dyeing wastewater real-time adjustment suspended filler filling density, ensure that biological fluidized bed unit is always in optimum flow state, improve printing and dyeing wastewater treatment effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater treatment, and specifically relates to a micro-aerobic fluidized bed biofilm system for printing and dyeing wastewater treatment. BACKGROUND

[0002] Printing and dyeing wastewater, as an important component of industrial wastewater, has the characteristics of large water quantity, high organic concentration, complex composition, high colority and three toxicities, and effective treatment thereof has important value for protecting the surface water environment and safety. The relatively new fluidized bed biofilm can degrade organic matter in wastewater by culturing biofilm in the fluidized bed, and has a good removal effect on refractory organic matter. However, the fluidized bed biofilm system in the prior art, such as the invention patent with the publication number CN114162968A, adopts a stirring mode to make the modified polyurethane sponge carrier fully contact with the wastewater, which can improve the wastewater treatment effect to a certain extent, but the single flow channel and single level polyurethane sponge carrier used only have a general treatment effect on printing and dyeing wastewater containing pollutants of various particle sizes, and the polyurethane sponge carrier is easy to gather and scatter in the reactor, resulting in uneven distribution of microorganisms on the surface of the carrier, so that a relatively thick biofilm may be formed in some areas, while a relatively thin biofilm is formed in other areas. Especially with the fluctuation of the water quality of printing and dyeing wastewater, the system cannot quickly adjust to adapt to the conditions of new water quality, greatly affecting the wastewater treatment effect. Therefore, it is necessary to provide a micro-aerobic fluidized bed biofilm system for printing and dyeing wastewater treatment to solve the problems raised in the background art. SUMMARY

[0003] To achieve the above-mentioned purpose, the application provides the following technical scheme: a micro-aerobic fluidized bed biofilm system for printing and dyeing wastewater treatment, comprising:

[0004] A tank cylinder is fixed with an outer cylinder seat at the lower end face, and a frame is installed on the periphery of the outer cylinder seat;

[0005] A water feeding pipe is vertically connected above the tank cylinder, and the water feeding pipe continuously feeds printing and dyeing wastewater into the tank cylinder;

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

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

[0008] A biological fluidized bed unit is vertically arranged in the tank cylinder, and the biological fluidized bed unit is used for biodegradation of the printing and dyeing wastewater after preliminary treatment; a drainage pipe is vertically connected below the middle part of the biological fluidized bed unit, a drainage channel is arranged on the outer cylinder seat, and the other end of the drainage pipe is connected with the drainage channel;

[0009] An oxygen delivery mechanism is installed inside the outer cylinder and located below the biological fluidized bed unit. The oxygen delivery mechanism is connected to the biological fluidized bed unit through multiple air delivery pipes.

[0010] The biological fluidized bed unit includes:

[0011] The cylindrical body is coaxially fixed inside the tank. There are three cylindrical bodies distributed in a circle. The three cylindrical bodies are sealed together to form two inner ring chambers. The outer cylindrical body is sealed together with the tank to form an outer ring chamber.

[0012] Primary suspension packing, secondary suspension packing, and tertiary suspension packing are distributed sequentially from the outside to the inside in the outer ring chamber and the two inner ring chambers.

[0013] Drainage holes are provided on the side walls of each of the cylinders, and the outer ring chamber and the two inner ring chambers are connected to each other through the drainage holes.

[0014] A water supply seat is installed above the cylinder body, and the lower end of the water supply pipe is sealed to the water supply seat. The water supply seat is connected to the outer ring chamber; and the drain pipe is connected to the innermost cylinder body.

[0015] An adjustment mechanism is installed on each of the cylinders. The adjustment mechanism adjusts the filling density of the primary, secondary and tertiary suspended packing materials outside the cylinders based on the water quality changes of the dyeing and printing wastewater, so that the biological fluidized bed unit always maintains the optimal fluidization state.

[0016] Preferably, the oxygen delivery mechanism includes:

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

[0018] The inner ring wall is centrally located in the vortex cavity, and multiple channels are circumferentially formed on the inner ring wall.

[0019] An upward airflow disk is coaxially disposed above the vortex cavity. The upper end face of the vortex cavity has an opening in the middle of the inner ring wall, and the upward airflow disk is connected to the vortex cavity through the opening.

[0020] A ring pipe is provided corresponding to each of the cylinders, and the ring pipe is located inside the tank below each of the cylinders;

[0021] The connecting pipes are multiple in a circular arrangement, with one end of each connecting pipe connected to the annular pipe and the other end connected to the upper airflow disk; the air supply pipe has an L-shaped cross-section, with one end connected to the annular pipe and the other end arranged parallel to the outer periphery of the cylinder.

[0022] As preferred, each of the barrel bodies is vertically provided with an exhaust port corresponding to the air feeding pipe, which is used for discharging excess oxygen.

[0023] As preferred, the lower part of the water feeding seat is sealingly connected with a vortex chamber, the middle part of the vortex chamber is vertically provided with a middle channel, the lower part of the vortex chamber is provided with an annular cavity, the middle channel is connected with the annular cavity through a plurality of side holes, the lower end surface of the annular cavity is distributed with a plurality of water feeding holes, and each of the water feeding holes is connected with the outer barrel body through a gap.

[0024] As preferred, the side wall of the barrel body is vertically fixed with a plurality of partition plates, the side wall of the barrel body is divided into a plurality of flow channels by the partition plates, and the flow channels are arranged one by one corresponding to the gaps.

[0025] The side wall of the barrel body is also vertically fixed with a baffle, the baffle is distributed staggered with the partition plates, and the gap and the drain hole are arranged in the flow channel and located on both sides of the baffle.

[0026] The lower part of each baffle is slidingly connected with a sealing plate, and the lower end of the sealing plate is provided with a water guide hole.

[0027] As preferred, the adjusting mechanism comprises:

[0028] The flow resistance plate is circumferentially distributed, each of the flow resistance plates is slidingly connected in the flow channel, the air feeding pipe in the oxygen feeding mechanism is connected with the flow resistance plate, and the lower end of the sealing plate is fixed in the middle part of the flow resistance plate.

[0029] The slide rod is vertically fixed at the lower end of each flow resistance plate, and the slide rod is slidingly connected on the barrel body.

[0030] The fixed ring is coaxially arranged below the barrel body, and the lower end of the slide rod is fixed with the fixed ring.

[0031] As preferred, the printing and dyeing wastewater enters the corresponding flow channel through each gap, flows downward, and then flows upward after passing through the water guide hole, and is finally discharged through the drain hole.

[0032] As preferred, the outer barrel seat is provided with a push disc corresponding to the barrel body, each push disc is arranged with the same center, the outer barrel seat is fixed with a plurality of extension parts, the output end of each extension part is connected with the push disc, and the upper end of the push disc is connected with each fixed ring through a connecting rod.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] The three cylinders and the tank cylinder are matched 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 sequentially filled with first-level suspended filler, second-level suspended filler and third-level suspended filler, so that multi-stage treatment of wastewater can be formed, and the suspended fillers of different levels can form diversified micro-environments, which is beneficial to the growth and reproduction of various microorganisms. The adjusting mechanism can 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 water quality fluctuation of the printing and dyeing wastewater. On the one hand, it ensures that the biological fluidized bed unit is always in the best fluidization state, avoiding local accumulation or excessive voids, and on the other hand, it can help to form uniform and efficient biofilm, thereby improving the removal rate of various pollutants. BRIEF DESCRIPTION OF DRAWINGS

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

[0036] Figure 2 It is a schematic diagram of the present application;

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

[0038] Figure 4 It is a schematic diagram of the outermost cylinder in the present application;

[0039] Figure 5 It is a schematic diagram of the oxygen feeding mechanism in the present application;

[0040] Figure 6 It is a schematic diagram of the adjusting mechanism in the present application;

[0041] Figure 7 It is a schematic diagram of the telescopic part and the push disc in the present application;

[0042] In the figure: 1, tank cylinder; 11, water feeding pipe; 12, drainage pipe; 2, outer cylinder seat; 21, frame; 22, oxygen supply channel; 23, oxygen feeding 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 feeding mechanism; 41, vortex chamber; 42, hole; 43, upper airflow disc; 44, ring pipe; 45, connecting pipe; 46, gas feeding pipe; 5, water feeding seat; 51, vortex bin; 52, middle channel; 53, water feeding hole; 54, gap; 6, adjusting mechanism; 61, flow resistance plate; 62, slide rod; 63, fixed ring; 64, push disc; 65, telescopic part; 66, connecting rod. DETAILED DESCRIPTION

[0043] Please refer to Figures 1-7The embodiment of the present application is a micro-aerobic fluidized bed biofilm system for printing and dyeing wastewater treatment, which comprises:

[0044] A tank cylinder 1 is fixed with an outer cylinder base 2 at the lower end surface, and a frame 21 is mounted on the periphery of the outer cylinder base 2;

[0045] A water feeding pipe 11 is vertically connected above the tank cylinder 1, which continuously feeds the printing and dyeing wastewater into the tank cylinder 1;

[0046] An oxygen supply channel 22 is provided on the side wall of the outer cylinder base 2, and an oxygen feeding pipe 23 is horizontally connected in the oxygen supply channel 22, and one end of the oxygen feeding pipe 23 is connected with an oxygen pump 25 through a ball valve 24; by adjusting the opening degree 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, to ensure sufficient dissolved oxygen supply to support the growth and activity of aerobic microorganisms, thereby effectively degrading organic matter in the printing and dyeing wastewater;

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

[0048] A biological fluidized bed unit 3 is vertically arranged in the tank cylinder 1, which is used for biological degradation of the printing and dyeing wastewater after preliminary treatment (mainly removing large particle substances in the wastewater through a grid or screen during preliminary treatment of the printing and dyeing wastewater to prevent these substances from causing subsequent blockage); a drain pipe 12 is vertically connected below the middle part of the biological fluidized bed unit 3, a drain channel 27 is provided on the outer cylinder base 2, and the other end of the drain pipe 12 is connected with the drain channel 27; thereby discharging the treated printing and dyeing wastewater through the drain channel 27;

[0049] An oxygen feeding mechanism 4 is arranged in the outer cylinder base 2 below the biological fluidized bed unit 3, and the oxygen feeding mechanism 4 is connected with the biological fluidized bed unit 3 through a plurality of air feeding pipes 46;

[0050] The biological fluidized bed unit 3 comprises:

[0051] A cylinder body 31 is coaxially fixed in the tank cylinder 1, and the cylinder body 31 is distributed in three concentric circles, and the three cylinder bodies 31 are sealingly matched to form two inner ring warehouses, and the outer cylinder body 31 is sealingly matched with the tank cylinder 1 to form an outer ring warehouse 32;

[0052] Primary suspended fillers, secondary suspended fillers, and tertiary suspended fillers are sequentially distributed from the outside to the inside in the outer ring warehouse 32 and the two inner ring warehouses; a layer of biofilm is formed on the surface of the suspended fillers, and part of the organic matter is degraded through the metabolic action of microorganisms;

[0053] Drainage holes 33 are arranged on the side walls of the barrels 31, and the outer ring tank 32 and the two inner ring tanks are connected with each other through the drainage holes 33; wherein the printing and dyeing wastewater can enter the two inner ring tanks through the drainage holes 33 on the barrels 31 in sequence after entering the outer ring tank 32, so as to be subjected to organic matter degradation treatment by the first-stage suspended filler, the second-stage suspended filler and the third-stage suspended filler, respectively.

[0054] The water delivery seat 5 is installed above the barrel 31, the lower end of the water delivery pipe 11 is sealingly connected with the water delivery seat 5, the water delivery seat 5 is connected with the outer ring tank 32, and the drainage pipe 12 is connected with the innermost barrel 31.

[0055] The adjusting mechanism 6 is arranged on each barrel 31, the adjusting mechanism 6 adjusts the filling density of the first-stage suspended filler, the second-stage suspended filler and the third-stage suspended filler outside the barrel based on the water quality change of the printing and dyeing wastewater, so that the biological fluidized bed unit 3 always maintains the best fluidization state, so as to expand the contact effect between the pollutants in the wastewater and the biological membrane on the surface of the filler in the biological fluidized bed unit 3, thereby improving the mass transfer efficiency and the degradation rate; and through dynamic adjustment, the system can better cope with different water quality conditions and ensure stable treatment effect; compared with the traditional technology, the present application can quickly respond to the change of the water quality, ensure efficient operation under different conditions, and be applicable to various types of wastewater treatment, especially the printing and dyeing wastewater with complex composition and large water quality fluctuation.

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

[0057] The vortex chamber 41 is fixed in the outer barrel seat 2, and the air inlet end of the vortex chamber 41 is connected with the oxygen delivery pipe 23.

[0058] The inner ring wall is centrally arranged in the vortex chamber 41, and a plurality of hole channels 42 are arranged on the circumference of the inner ring wall.

[0059] The upper airflow disc 43 is coaxially arranged above the vortex chamber 41, and the upper end surface of the vortex chamber 41 is arranged with a through port in the middle of the inner ring wall, and the upper airflow disc 43 is connected with the vortex chamber 41 through the through port; so that the vortex chamber 41 can uniformly deliver oxygen to the upper airflow disc 43.

[0060] The ring pipe 44 is arranged corresponding to each barrel 31, and the ring pipe 44 is arranged below each barrel 31 in the tank barrel 1.

[0061] Connecting pipe 45, for the circular distribution of a plurality of, each of the connecting pipe 45 one end with the ring pipe 44, and its other end with the upper airflow plate 43 is connected; the cross section of the gas pipe 46 is L-shaped structure, one end of the gas pipe 46 is connected to the ring pipe 44, the other end of the gas pipe 46 is parallelly arranged in the circumferential periphery of the cylinder 31, that is, the oxygen in the upper airflow plate 43 can enter the ring pipe 44 in turn through each connecting pipe 45, at this time, the oxygen flowing in the ring pipe 44 can be uniformly discharged through the gas pipe 46.

[0062] As a preferred embodiment, each of the cylinder 31 is vertically provided with the exhaust port corresponding to the gas pipe 46 (not shown in the figure), the exhaust port is used for discharging excess oxygen.

[0063] In this embodiment, the lower part of the water seat 5 is sealingly connected with the vortex chamber 51, the middle part of the vortex chamber 51 is vertically provided with the middle channel 52, the lower part of the vortex chamber 51 is provided with the ring cavity, the middle channel 52 is connected with the ring cavity through a plurality of side holes, the lower end surface of the ring cavity is distributed with a plurality of water supply holes 53, each of the water supply holes 53 is connected with the outer cylinder 31 through the gap 54, so as to ensure that the printing and dyeing wastewater can enter the tank cylinder 1 through each water supply hole 53.

[0064] In this embodiment, the side wall of the cylinder 31 is vertically fixed with a plurality of partition plates 34, the partition plates 34 divide the side wall of the cylinder 31 into a plurality of flow channels, the flow channels are correspondingly arranged 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, the printing and dyeing wastewater of each flow branch corresponds to enter each flow channel;

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

[0066] Each of the baffles 35 is slidably connected with a sealing plate 36, and the lower end of the sealing plate 36 is provided with a water guide hole 37.

[0067] In this embodiment, the adjusting mechanism 6 comprises:

[0068] The baffle 35 is slidably connected with a sealing plate 36, and the lower end of the sealing plate 36 is provided with a water guide hole 37.

[0069] A slide rod 62 is vertically fixed at the lower end of each baffle 61, and the slide rod 62 is slidably connected to the cylinder 31;

[0070] A fixed ring 63 is coaxially arranged below the cylinder 31, and the lower end of the slide rod 62 is fixed to the fixed ring 63. When the baffle 61 is slid upward, the effective volume of the flow channel is reduced, so that the filling density of the suspended filler in the flow channel gradually increases. Therefore, by controlling the position of the baffle 61, the filling density of the suspended filler can be finely adjusted to adapt to different water quality conditions. The filling density of the primary suspended filler, the secondary suspended filler and the tertiary suspended filler can be independently changed, and each level of filler can maintain the best fluidization 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 tunnel 54, flows downward, and then flows upward after passing through the water guide hole 37. Finally, the wastewater is discharged from the drainage hole 33. The baffle 35 and the sealing plate 36 on the outer cylinder 31 are in sealing contact with the inner wall of the tank cylinder 1.

[0072] In this embodiment, the outer cylinder seat 2 is provided with a push disc 64 corresponding to the cylinder 31. Each push disc 64 is arranged with the same center. The outer cylinder seat 2 is fixed with a plurality of extension parts 65. The output end of each extension part 65 is connected to the push disc 64. The upper end of the push disc 64 is connected to each fixed ring 63 through a connecting rod 66. The push disc 64 is adjusted to slide up and down by the extension and retraction of each extension part 65. The corresponding fixed ring 63 can move up and down synchronously, so as to change the filling density of the suspended filler outside each cylinder 31.

[0073] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A micro-aerobic fluidized bed biofilm system for treating dyeing and printing wastewater, characterized in that, include: The can has an outer cylinder seat fixed to its lower end face, and a frame is installed around the outer cylinder seat; The water supply pipe is vertically connected to the top of the tank; the oxygen supply channel is located on the side wall of the outer cylinder, and an oxygen supply pipe is horizontally connected inside the oxygen supply channel. One end of the oxygen supply pipe is connected to the oxygen pump through a ball valve. The flow meter is installed between the oxygen supply pipe and the ball valve; The biological fluidized bed unit is vertically installed inside the tank. A drain pipe is vertically connected to the lower middle part of the biological fluidized bed unit. A drain channel is provided on the outer cylinder seat. The other end of the drain pipe is connected to the drain channel. The oxygen delivery mechanism is located inside the outer cylinder and below the biological fluidized bed unit. The oxygen delivery mechanism is connected to the biological fluidized bed unit through multiple air delivery pipes. The biological fluidized bed unit includes: The cylindrical body is coaxially fixed inside the tank. There are three cylindrical bodies distributed in the same circle. The three cylindrical bodies are sealed together to form two inner ring chambers. The outer cylindrical body is sealed together with the tank to form an outer ring chamber. An adjustment mechanism is installed on each cylinder to adjust the filling density of the primary, secondary, and tertiary suspended packings outside the cylinder. The side wall of the cylinder is also vertically fixed with baffles, and each baffle is slidably connected with a sealing plate below it; The regulating mechanism includes: The flow baffles are multiple in a circular arrangement, each of which is slidably connected within the flow channel. The air delivery pipes in the oxygen delivery mechanism are all connected to the flow baffles, and the lower end of the sealing plate is fixed to the middle of the flow baffle. The sliding rods are vertically fixed to the lower end of each baffle plate, and the sliding rods slide through the cylinder. A retaining ring is coaxially positioned at the bottom of the cylinder, and the lower end of the sliding rod is fixed to the retaining ring; The outer cylinder seat is equipped with push plates corresponding to the cylinder body. Each push plate is arranged in a concentric circle. Multiple telescopic parts are fixed inside the outer cylinder seat. The output end of each telescopic part is connected to the push plate. The upper end of each push plate is connected to each fixed ring through a connecting rod. The oxygen delivery system includes: The vortex chamber is fixed in the outer cylinder seat, and the air inlet of the vortex chamber is connected to the oxygen supply pipe. The inner ring wall is centrally located in the vortex cavity, and multiple channels are circumferentially formed on the inner ring wall. An upper airflow disk is coaxially positioned above the vortex cavity. The upper end face of the vortex cavity has an opening in the middle of the inner ring wall, and the upper airflow disk is connected to the vortex cavity through the opening. The ring pipe is installed corresponding to each cylinder and is located below each cylinder inside the tank. The connecting pipe consists of multiple pipes distributed circumferentially. One end of each connecting pipe is connected to the ring pipe, and the other end is connected to the upper airflow plate. The air supply pipe has an L-shaped cross-section. One end of the air supply pipe is connected to the ring pipe, and the other end of the air supply pipe is set parallel to the outer circumference of the cylinder.

2. The micro-aerobic fluidized bed biofilm system for treating dyeing and printing wastewater according to claim 1, characterized in that, The biological fluidized bed unit also includes: Primary suspension packing, secondary suspension packing, and tertiary suspension packing are distributed sequentially from the outside to the inside in the outer ring chamber and the two inner ring chambers. Drainage holes are provided on the side walls of each cylinder, and the outer ring chamber and the two inner ring chambers are connected to each other through drainage holes. The water supply seat is installed on top of the cylinder. The lower end of the water supply pipe is sealed to the water supply seat, which is connected to the outer ring chamber. The drain pipe is connected to the innermost cylinder.

3. The micro-aerobic fluidized bed biofilm system for treating dyeing and printing wastewater according to claim 1, characterized in that, Each cylinder has a vertically installed exhaust port corresponding to the air supply pipe.

4. The micro-aerobic fluidized bed biofilm system for treating dyeing and printing wastewater according to claim 2, characterized in that, The water supply seat is sealed below a vortex chamber. A central channel is vertically arranged in the middle of the vortex chamber. An annular cavity is arranged below the vortex chamber. The central channel is connected to the annular cavity through multiple side holes. Multiple water supply holes are distributed on the lower end face of the annular cavity. Each water supply hole is connected to the outer cylinder through a gap.

5. The micro-aerobic fluidized bed biofilm system for treating dyeing and printing wastewater according to claim 4, characterized in that, Multiple partition plates are vertically fixed on the side wall of the cylinder. The partition plates divide the side wall of the cylinder into multiple flow channels, and the flow channels and gaps are set one-to-one. The baffles and partitions are staggered, and the channels and drainage holes are set in the flow channel and located on both sides of the baffles. A water guide hole is provided at the lower end of the sealing plate.

6. The micro-aerobic fluidized bed biofilm system for treating dyeing and printing wastewater according to claim 4, characterized in that, The dyeing and printing wastewater enters the corresponding flow channel through each gap and flows downward. After passing through the water guide hole, it flows upward and is finally discharged through the drain hole.

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