An ozone-powdered activated carbon coupled biological fluidized bed for treating sewage

Abstract

The present invention discloses an ozone-powdered activated carbon coupled biological fluidized bed for treating sewage, which includes a bed body and an ozone addition area, a supporting layer, and an activated carbon fluidized layer sequentially arranged inside the bed body from bottom to top. It also includes an air supply pipe and a plurality of addition devices arranged on the air supply pipe; the air supply pipe is circular; the addition device includes an air outlet pipe and a support frame, and the support frame enables the air outlet pipe to be installed on the air supply pipe, and the air outlet pipe and the air supply pipe are connected through a hose; the middle part of the length of the addition device is rotatably connected to the support frame; one end of the addition device is an air outlet end, and a water baffle is fixedly connected to the side wall of the other end, and the water baffle controls the flipping of the air outlet pipe through its own gravity and the impact of the water flow; the air outlet end is fixedly installed with a top cover, and an adjusting cover is attached to the inner side wall of the top cover, and air outlet holes are provided on both the adjusting cover and the top cover; the purpose of automatically adjusting the ozone addition amount can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of water treatment, and particularly to an ozone-powdered activated carbon coupled biological fluidized bed for treating sewage. Background Art

[0002] Surface water has gradually become one of the main water sources for drinking water. However, surface water in many areas is polluted to varying degrees, especially the indicators such as organic matter, ammonia nitrogen, and turbidity remain high, posing a severe test to the conventional drinking water treatment processes. Traditional conventional water purification treatment processes such as flocculation, sedimentation, filtration, and disinfection may have limitations in dealing with some complex pollution problems, and it is difficult to effectively remove some stubborn pollutants. Moreover, with the aggravation of pollution, the treatment capacity and efficiency of the conventional treatment processes are becoming increasingly insufficient. To overcome the defects of the conventional processes, the ozone + activated carbon filter process is often used for the advanced treatment of drinking water. Although the removal efficiency of pollutants has been improved to a certain extent, it brings about a longer process flow, and the efficiency improvement is not obvious while the operating cost increases sharply.

[0003] However, in some water treatment processes, in the ozone addition step, the ozone output is constant and cannot be changed with the change of water flow. On the one hand, it causes waste of ozone, and on the other hand, the ozone concentration is too high while the water flow decreases, resulting in ozone overflowing into the workshop, which is likely to pollute the environment and affect the health of the staff. Summary of the Invention

[0004] An ozone-powdered activated carbon coupled biological fluidized bed for treating sewage provided by the present application adopts the following technical solutions:

[0005] An ozone-powdered activated carbon coupled biological fluidized bed for treating sewage includes a bed body, an ozone addition area, a supporting layer, and an activated carbon fluidized layer sequentially arranged inside the bed body from bottom to top, and also includes an air supply pipe arranged in the ozone addition area and a plurality of addition devices arranged on the air supply pipe;

[0006] The air supply pipe is circular, and a plurality of addition devices are located inside the air supply pipe and are evenly distributed around the center of the air supply pipe;

[0007] The addition device includes an air outlet pipe and a support frame. The support frame enables the air outlet pipe to be installed on the air supply pipe, and the air outlet pipe and the air supply pipe are connected through a hose;

[0008] The middle part of the length of the addition device is rotatably connected to the support frame, enabling the addition device to flip along the connection;

[0009] One end of the addition device is the air outlet end, and a water baffle is fixedly connected to the side wall of the other end. The water baffle controls the flipping of the air outlet pipe through its own gravity and the water flow impact;

[0010] A top cover is fixedly installed at the air outlet end. An adjusting cover is fitted to the inner side wall of the top cover. Air outlet holes are provided on both the adjusting cover and the top cover. The adjusting cover can rotate with the air outlet pipe, controlling the misalignment or overlap of the air outlet holes on the adjusting cover and the top cover.

[0011] By adopting the above technical solution, when the water flow changes, under the interaction of the size of the water flow and its own gravity, the baffle can control the air outlet end of the air outlet pipe to turn downward or upward, thereby automatically controlling the ozone addition amount according to the water flow, avoiding too high ozone concentration in the wastewater, and making the working environment of the staff safer.

[0012] Optionally, both the top cover and the adjusting cover are provided in a frustum shape, and the air outlet holes are located on the surfaces of the top cover and the adjusting cover, making the air outlet holes inclined relative to the air outlet pipe.

[0013] By adopting the above technical solution, the surfaces of the frustum-shaped top cover and the adjusting cover are inclined, so that the air outlet holes provided on the top cover are inclined, which can make the sprayed ozone range larger, facilitating the integration of ozone into the wastewater. Moreover, the frustum-shaped top cover and the adjusting cover can also be more conveniently matched together, reducing the probability of the top cover and the adjusting cover detaching.

[0014] Optionally, a baffle is fixedly connected to the top end of the adjusting cover. The baffle protrudes from the top end of the top cover and fits with the end face of the top cover.

[0015] By adopting the above technical solution, the baffle and the frustum-shaped adjusting cover cooperate to enable the adjusting cover to better fit inside the top cover, reducing the gap between the adjusting cover and the top cover, and enabling the ozone spraying amount to be controlled more precisely.

[0016] Optionally, the support frame is composed of two support plates. The two support plates are arranged horizontally and parallelly. One end of the support plate is fixedly connected to the air supply pipe;

[0017] A cross shaft is arranged between the ends of the two support plates away from the air supply pipe. Both ends of the cross shaft are fixedly connected to the two support plates respectively;

[0018] The middle part of the length of the air outlet pipe is rotatably connected to the cross shaft. The cross shaft is hollow inside, and a plurality of rectangular holes are provided on the part of the cross shaft located inside the air outlet pipe;

[0019] One end of the flexible pipe is connected to the air supply pipe, and the other end of the flexible pipe is fixedly connected to the end of the cross shaft.

[0020] By adopting the above technical solution, it is more convenient to supply ozone to the air outlet pipe and will not affect the flipping of the air outlet pipe.

[0021] Optionally, an adjusting device is arranged inside the air outlet pipe. The adjusting device includes a rotating shaft arranged parallel to the horizontal axis and a transmission shaft arranged perpendicular to the horizontal axis. The rotating shaft is located between the horizontal axis and the air outlet end.

[0022] A gear is coaxially and fixedly connected to the rotating shaft. A circle of tooth grooves is evenly formed on the circumferential surface of the horizontal axis around the axis of the horizontal axis. The gear meshes with the tooth grooves.

[0023] The transmission shaft and the rotating shaft are linked by a bevel gear set. One end of the transmission shaft far away from the horizontal axis is fixedly connected to the adjusting cover.

[0024] By adopting the above technical solution, when the air outlet pipe is turned over, the adjusting device can automatically adjust the overlapping degree of the top cover and the air outlet holes on the adjusting cover, and further can better control the amount of ozone ejected, ensuring that the amount of ejected ozone meets the requirements of the current water flow size and will not cause too much or too little ozone.

[0025] Optionally, the number of the gears is two, and the two gears are respectively arranged on both sides of the bevel gear.

[0026] By adopting the above technical solution, the cooperation of the two gears can make the rotating shaft rotate more stably, avoiding the uneven force on the rotating shaft and causing it to tilt during the rolling of the gear.

[0027] Optionally, the activated carbon fluidized bed is in two layers, and the diameters of the activated carbon particles in the two layers of activated carbon fluidized beds are different. The layer with relatively larger diameter of the activated carbon fluidized bed particles is located below the layer with relatively smaller diameter of the activated carbon fluidized bed particles.

[0028] By adopting the above technical solution, the activated carbon fluidized bed with two kinds of activated carbon particle diameters can make the activated carbon fluidized bed suitable for the treatment of waste water with different concentrations.

[0029] Optionally, an isolation layer is arranged between the two layers of activated carbon fluidized beds, and the isolation layer is filled with cobblestones.

[0030] By adopting the above technical solution, the cobblestones can isolate the two layers of activated carbon fluidized beds, avoiding the mixing of the activated carbon with two kinds of particle diameters and affecting the fluidization effect of the activated carbon fluidized bed.

[0031] To sum up,

[0032] 1. The air outlet pipe can be turned over. When the water flow changes, the air outlet pipe automatically turns over, and the regulator also rotates accordingly, so that the amount and position of the ejected ozone both change in the bed body, and further the ozone concentration in the waste water will not be too high or too low due to the change of the water flow, avoiding the overflow of ozone and making the working environment of the staff safer. Brief Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the fluidized bed in the embodiment.

[0034] Figure 2 It is a cross-sectional view inside the fluidized bed in the embodiment.

[0035] Figure 3 It is a schematic diagram of the ozone addition area in the embodiment.

[0036] Figure 4 It is a schematic diagram of the structure of the ozone addition device in the embodiment.

[0037] Figure 5 It is a cross-sectional view of the ozone addition device in the embodiment.

[0038] Figure 6 It is a schematic diagram of the structure of the adjusting cover in the embodiment.

[0039] Figure 7 It is Figure 5 the enlarged view of part A in

[0040] Explanation of reference numerals:

[0041] 1. Bed body; 11. Water inlet pipe; 12. Water outlet pipe; 2. Ozone addition area; 3. Support layer; 31. Support net; 32. Pebbles; 4. Activated carbon fluidized layer; 5. Gas supply pipe; 51. Connecting plate; 6. Addition device; 61. Gas outlet pipe; 611. Gas outlet end; 612. Baffle; 613. Top cover; 614. Gas outlet hole; 615. Adjusting cover; 616. Limiting plate; 617. Disc; 618. Hole; 619. Limiting ring; 62. Support frame; 621. Support plate; 622. Horizontal axis; 623. Rectangular hole; 624. Tooth groove; 63. Adjusting device; 631. Rotating shaft; 632. Gear; 633. Transmission shaft; 634. Bevel gear assembly; 7. Hose; 8. Air inlet pipe. Detailed implementation manners

[0042] The following further elaborates on this application in conjunction with the attached Figures 1-7 drawings for a more detailed description.

[0043] An embodiment of this application discloses an ozone-powder activated carbon coupled biological fluidized bed for treating wastewater. Referring to Figure 1 and Figure 2 , the biological fluidized bed includes a bed body 1 and an ozone addition area 2, a support layer 3, and an activated carbon fluidized layer 4 that are sequentially arranged inside the bed body 1 from bottom to top. The ozone addition area 2 is mainly used to add ozone to the sewage, the support layer 3 is used to support the activated carbon fluidized layer 4 to facilitate the placement of activated carbon, and the activated carbon fluidized layer 4 is mainly used to adsorb and remove various substances in the sewage.

[0044] Referring to Figure 1 andFigure 2 , a water inlet pipe 11 is connected to the side wall of the bed body 1 near the bottom, and a water outlet pipe 12 is fixedly connected to the top of the bed body 1; sewage enters the bed body 1 through the water inlet pipe 11, ozone is added in the ozone addition area 2, and then fluidized through the activated carbon fluidized bed 4, which can better treat the sewage. The wastewater flows upward through the activated carbon fluidized bed, making the activated carbon in a flowing state, so as to increase the contact area between the activated carbon and the wastewater per unit time and supply sufficient oxygen, and utilize or top-attach the boiling state to strengthen the wastewater biological treatment structure, improving the treatment effect of the sewage.

[0045] Refer to Figure 2 , the supporting layer 3 includes a supporting net 31 fixedly connected inside the bed body 1 and cobblestones 32 laid on the supporting net 31. The supporting net 31 is meshed, one is to facilitate the laying of the cobblestones 32, and the other is to facilitate the passage of wastewater; the cobblestones 32 are of four different particle sizes, and the particle sizes decrease from bottom to top in sequence, which is convenient for the passage of wastewater and can also support the activated carbon.

[0046] The activated carbon fluidized bed 4 is laid with two layers of activated carbon with different particle sizes. The activated carbon with a relatively large particle size is located above the activated carbon with a relatively small particle size. The activated carbon with different particle sizes can be suitable for wastewater with different flow rates, and the two layers of the activated carbon fluidized bed 4 are also isolated by the cobblestones 32 to prevent the mixing of the activated carbon particles in the two layers. When the water flow is small, the impact force of the water flow is not too large, so the activated carbon particles in the lower layer are not washed too loose. When the water flow is large, the impact force of the water flow increases, so the activated carbon particles in the lower layer are more loose, increasing the contact area between the activated carbon and the wastewater, improving the fluidization reaction; when the water flow is small, after passing through the activated carbon fluidized bed 4 with small particles, the flow rate is further reduced, and when passing through the activated carbon fluidized bed 4 with large particles, the reaction can be better carried out.

[0047] Refer to Figure 3 , a circular air supply pipe 5 is arranged in the ozone addition area 2. A plurality of ozone addition devices 6 are arranged in the inner circle of the air supply pipe 5, and the plurality of addition devices 6 are evenly distributed around the center of the air supply pipe 5; the addition device 6 is connected to the air supply pipe 5 through a hose 7, and an air inlet pipe 8 is connected to the air supply pipe 5. The air inlet pipe 8 can introduce ozone into the air supply pipe 5. The air supply pipe 5 provides ozone for the plurality of addition devices 6, and the addition device 6 can add ozone to the ozone addition area 2 to make the ozone dissolve into the wastewater.

[0048] Refer to Figure 4, the adding device 6 includes an air outlet pipe 61 and a support frame 62 for connecting the air outlet pipe 61; the support frame 62 is composed of two support plates 621, the support plates 621 are arranged horizontally, one end of the support plate 621 is fixedly connected to the air supply pipe 5, the two support plates 621 are arranged in parallel, a horizontal axis 622 is arranged at one end of the two support plates 621 away from the air supply pipe 5, and both ends of the horizontal axis 622 are fixedly connected to the two support plates 621 respectively. The middle part of the length of the air outlet pipe 61 passes through the horizontal axis 622, and the air outlet pipe 61 is rotatably connected to the horizontal axis 622, so that the air outlet pipe 61 can rotate around the horizontal axis 622; one end of the air outlet pipe 61 is an air outlet end 611, and a semicircular water baffle 612 is fixedly connected to the other end of the air outlet pipe 61, and one straight side end of the water baffle 612 is fixedly connected to the air outlet pipe 61, and one end of the arc side of the water baffle 612 is inclined in the direction away from the air outlet end 611. When the water flow is small, the air outlet pipe 61 is arranged vertically, and the air outlet end 611 is arranged upward. Because the water flow is small, the flow rate is slow, so the air outlet end 611 is upward, so that the position where ozone is incorporated into the wastewater is closer to the activated carbon fluidized bed 4. Furthermore, the ozone concentration in the wastewater will not be too high. After passing through the activated carbon fluidized bed 4, the ozone concentration in the treated water reaches the safety value. In the subsequent water treatment process, there will be no ozone overflow, avoiding environmental pollution and improving the safety of the working environment of the staff.

[0049] When the water flow is too large, the water flow will impact the water baffle 612, exert a thrust on the water baffle 612, cause the air outlet pipe 61 to rotate, and then cause the air outlet end 611 to tilt downward, so that the ozone addition position is farther away from the activated carbon fluidized bed 4, so that ozone can have more time to be incorporated into the wastewater, so that the concentration of ozone contained in the wastewater can meet the standard, avoiding that due to too large water flow, the ozone incorporation time is too short, resulting in the ozone concentration in the wastewater not meeting the standard.

[0050] A connecting plate 51 is fixedly connected between the air supply pipe 5 and the bed body 1. The connecting plate 51 can install the air supply pipe 5 inside the bed body 1 and can also block the wastewater, so that the wastewater can only pass through the inner circle of the air supply pipe 5, so that ozone can be better incorporated into the wastewater.

[0051] Refer to Figure 5 , one end of the hose 7 is fixedly communicated with the air supply pipe 5, and the other end of the hose 7 is fixedly communicated with one end of the horizontal axis 622. The horizontal axis 622 is hollow inside, and a plurality of rectangular holes 623 are opened on the circumferential surface of the horizontal axis 622 located inside the air outlet pipe 61. The rectangular holes 623 are evenly distributed around the axis of the horizontal axis 622, which is convenient for the air supply pipe 5 to supply ozone to the inside of the air outlet pipe 61.

[0052] Inside the adding device 6, there is also an adjusting device 63. The adjusting device 63 includes a rotating shaft 631 arranged parallel to the horizontal shaft 622, and a gear 632 fixed on the rotating shaft 631. The gear 632 and the rotating shaft 631 are coaxially arranged. The two ends of the rotating shaft 631 are rotatably connected to the inside of the air outlet pipe 61. The rotating shaft 631 can rotate along its own axis. A circle of tooth grooves 624 is formed on the circumferential surface of the horizontal shaft 622 corresponding to the gear 632. The tooth grooves 624 are engaged with the gear 632. When the air outlet pipe 61 rotates, the gear 632 rolls in the tooth grooves 624, enabling the rotating shaft 631 to rotate.

[0053] The adjusting device 63 further includes a transmission shaft 633. The transmission shaft 633 is located at the axis of the air outlet pipe 61. The transmission shaft 633 is located between the horizontal shaft 622 and the air outlet end 611. The transmission shaft 633 is perpendicular to the rotating shaft 631, and the transmission shaft 633 and the rotating shaft 631 are connected by a bevel gear set 634. When the rotating shaft 631 rotates, it can drive the transmission shaft 633 to rotate along its own axis.

[0054] Refer to Figure 4 and Figure 5 As shown in

[0055] At the air outlet end 611, a conical top cover 613 is provided. A plurality of air outlet holes 614 are formed on the upper surface of the top cover 613. A layer of adjusting cover 615 is attached to the inside of the top cover 613. A plurality of air outlet holes 614 are also formed on the adjusting cover 615. The transmission shaft 633 is fixedly connected to the adjusting cover 615. The transmission shaft 633 can drive the adjusting cover 615 to rotate, thereby controlling the overlap or misalignment of the air outlet holes 614 on the top cover 613 and the adjusting cover 615, and further better controlling the amount of ozone added. The top cover 613 and the adjusting cover 615 are conical, making the surfaces of the top cover 613 and the adjusting cover 615 inclined. The air outlet holes 614 are located on the surfaces of the top cover 613 and the adjusting cover 615, so that the air outlet holes 614 are inclined relative to the air outlet pipe 61. Therefore, the range of the ejected ozone can be made larger, facilitating the better integration of ozone into the wastewater.

[0056] Refer to Figure 5 and Figure 6, a disc 617 is fixedly connected to the lower end of the adjusting cover 615. The transmission shaft 633 passes through the disc 617 and the limiting plate 616 and is fixedly connected, and at the same time, the transmission shaft 633 is also fixedly connected to the disc 617, so that the transmission shaft 633 can better drive the adjusting cover 615 to rotate. A plurality of uniformly distributed holes 618 are formed in the disc 617, so as to facilitate the passage of ozone.

[0057] Referring to Figure 6 and Figure 7 , a sealing ring 619 is fixedly connected to the circumferential surface of the disc 617. The sealing ring 619 is recessed in the inner wall of the bed body 1, so that the disc 617 and the bed body 1 are rotationally sealed, so that ozone will not enter between the adjusting cover 615 and the top cover 613, avoiding the overflow of ozone, and can also make the adjusting cover 615 rotate more stably.

[0058] The implementation principle of a biological fluidized bed for ozone-powdered activated carbon coupling for treating sewage in an embodiment of the present application is as follows: when the water flow entering the fluidized bed is small, at this time, the air outlet pipe 61 in the ozone addition area 2 maintains a vertically upward state, and the air outlet end 611 of the air outlet pipe 61 is arranged close to the activated carbon fluidized layer 4, and at this time, the air outlet holes 614 on the top cover 613 and the adjusting cover 615 are arranged in a staggered manner, which can control the air outlet volume of ozone, so that the ozone concentration in the wastewater will not exceed the standard, and further avoid the overflow of ozone in subsequent processes, ensuring that the ozone concentration in the working environment of the staff will not be too high and ensuring the health status of the staff.

[0059] When the water flow in the fluidized bed increases, the impact force of the water flow on the baffle 612 becomes larger. After the baffle 612 is stressed, it will drive the air outlet pipe 61 to turn over, so that the air outlet pipe 61 changes from a vertical state to an inclined state, and the air outlet end 611 of the air outlet pipe 61 faces downward. During the rotation of the air outlet pipe 61, the adjusting device 63 will move accordingly, driving the adjusting cover 615 to rotate, so that the overlapping area of the air outlet holes 614 on the adjusting cover 615 and the top cover 613 increases, increasing the fusion time of ozone and wastewater. At the same time, the air outlet volume of ozone is also increased, ensuring that when the water flow increases, the ozone concentration in the wastewater can also meet the standard, ensuring a normal biological fluidization reaction.

[0060] Because the baffle is located on one side of the air outlet pipe, the baffle also plays a role of counterweight. When the water flow decreases, the air outlet pipe will turn over to the initial direction, achieving automatic control of the position of ozone sprayed by the air outlet pipe in the wastewater and the amount of ozone. Using mechanical control can be more stable and improve the service life of the device.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An ozone-powdered activated carbon coupled biological fluidized bed for treating sewage, comprising a bed body (1) and an ozone addition zone (2), a supporting layer (3), and an activated carbon fluidized layer (4) arranged inside the bed body (1) from bottom to top, characterized in that: It also includes an air supply pipe (5) arranged in the ozone adding area (2) and a plurality of adding devices (6) arranged on the air supply pipe (5); The air supply pipe (5) is annular, and a plurality of adding devices (6) are located inside the air supply pipe (5) and are evenly distributed around the center of the air supply pipe (5); The adding device (6) comprises an air outlet pipe (61) and a support frame (62), wherein the support frame (62) enables the air outlet pipe (61) to be installed on the air supply pipe (5), and the air outlet pipe (61) and the air supply pipe (5) are connected via a hose (7); The middle portion of the length of the air outlet pipe (61) is rotatably connected to the support frame (62), so that the adding device (6) can be turned over along the connection; One end of the air outlet pipe (61) is an air outlet end (611), and a water baffle (612) is fixedly connected to the side wall of the other end. The water baffle (612) controls the air outlet pipe (61) to flip by its own gravity and the impact of the water flow. A top cover (613) is fixedly mounted on the air outlet end (611), an adjusting cover (615) is fitted on the inner wall of the top cover (613), and air outlet holes (614) are provided on the adjusting cover (615) and the top cover (613). The adjusting cover (615) can be turned over and rotated along with the air outlet pipe (61), so as to control the misalignment or overlap of the air outlet holes (614) on the adjusting cover (615) and the top cover (613); The support frame (62) is composed of two support plates (621), the two support plates (621) are arranged transversely and in parallel, and one end of the support plate (621) is fixedly connected to the air supply pipe (5); A transverse axis (622) is provided between the ends of the two support plates (621) away from the air supply pipe (5), and the two ends of the transverse axis (622) are respectively fixedly connected to the two support plates (621); The middle portion of the length of the air outlet pipe (61) is rotatably connected to the transverse axis (622), the interior of the transverse axis (622) is hollow, and a plurality of rectangular holes (623) are formed on the portion of the transverse axis (622) located inside the air outlet pipe (61); One end of the hose (7) is connected to the air supply pipe (5), and the other end of the hose (7) is fixedly connected to the end of the transverse axis (622); An adjusting device (63) is arranged inside the air outlet pipe (61), and the adjusting device (63) comprises a rotating shaft (631) arranged parallel to the horizontal axis (622) and a transmission shaft (633) arranged perpendicular to the horizontal axis (622), and the rotating shaft (631) is located between the horizontal axis (622) and the air outlet end (611); A gear (632) is coaxially fixedly connected to the rotating shaft (631), and a circle of tooth grooves (624) is evenly arranged on the peripheral surface of the horizontal shaft (622) around the axis of the horizontal shaft (622), and the gear (632) and the tooth groove (624) are meshed; The transmission shaft (633) and the rotating shaft (631) are linked via a bevel gear assembly (634), and one end of the transmission shaft (633) away from the transverse shaft (622) is fixedly connected to the adjustment cover (615); The number of the gears (632) is two, and the two gears (632) are respectively arranged on both sides of the bevel gear assembly (634).

2. The ozone-powdered activated carbon coupled biological fluidized bed for treating sewage according to claim 1, characterized in that: The top cover (613) and the adjusting cover (615) are both arranged in a truncated cone shape, and the air outlet (614) is located on the surface of the top cover (613) and the adjusting cover (615), so that the air outlet (614) is arranged obliquely compared to the air outlet pipe (61).

3. The ozone-powdered activated carbon coupled biological fluidized bed for treating sewage according to claim 1, characterized in that: The top end of the regulating cover (615) is fixedly connected with a baffle, which protrudes from the top end of the top cover (613) and fits with the end surface of the top cover (613).

4. The ozone-powdered activated carbon coupled biological fluidized bed for treating sewage according to claim 1, characterized in that: The activated carbon fluidized layer (4) comprises two layers, and the diameters of the activated carbon particles in the two layers of activated carbon fluidized layers (4) are different. The layer of activated carbon fluidized layer (4) with a relatively large particle diameter is located above the layer of activated carbon fluidized layer (4) with a relatively small particle diameter.

5. The ozone-powdered activated carbon coupled biological fluidized bed for treating sewage according to claim 4, characterized in that: An isolation layer is provided between the two activated carbon fluidized layers (4), and the isolation layer is filled with pebbles (32).

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