A dye degradation and recovery device for dyeing and printing wastewater

Abstract

This application provides a dye degradation and recovery device for dyeing and printing wastewater, including an adsorption tower with an activated carbon layer inside the adsorption tower; a conveying mechanism arranged along the axial direction of the adsorption tower, with its inlet end inserted into the activated carbon layer and its outlet end located at the top of the activated carbon layer to output activated carbon particles from the adsorption tower; a reflux mechanism arranged along the axial direction of the adsorption tower, with its bottom connected to the activated carbon layer to continuously convey treated activated carbon particles to the activated carbon layer; and a stirring mechanism fixedly connected to the rotating shaft of the conveying mechanism, installed inside the activated carbon layer to agitate the activated carbon particles, promote the cyclic movement of the activated carbon particles, improve the treatment efficiency of activated carbon for dyeing and printing wastewater, and achieve continuous treatment of wastewater.

Description

Technical Field

[0001] This application relates to the field of dyeing and printing wastewater, and more particularly to a dye degradation and recovery device for dyeing and printing wastewater. Background Technology

[0002] Dyeing and printing wastewater is one of the most difficult industrial wastewaters to treat due to its significant characteristics such as large discharge volume, high color intensity, poor biodegradability, difficulty in degradation, and high toxicity.

[0003] To degrade and remove dyes from wastewater, activated carbon adsorption decolorization is commonly used. The porous structure of activated carbon adsorbs colored substances such as acidic dyes, basic dyes, and reactive dyes, reducing the color of the wastewater. However, as pigments accumulate on the surface of the activated carbon, its adsorption capacity gradually decreases, affecting the degradation rate of dyes in the wastewater. Therefore, chemical regeneration of used activated carbon is necessary. This involves soaking the activated carbon in alkaline solutions or oxidants to wash away the adsorbed dyes and restore the functional groups on the activated carbon surface, allowing for reuse and reducing the cost of dye degradation in wastewater.

[0004] In activated carbon chemical regeneration technology, activated carbon needs to be soaked in alkaline solution or oxidant for several tens of minutes to achieve repeated use of its activity. When activated carbon degrades dyes in wastewater, a layer of activated carbon granules needs to be encapsulated in the wastewater treatment tower to adsorb pigments. However, the activated carbon granules in the encapsulation tower are difficult to remove in subsequent operations, making it difficult to chemically regenerate the activated carbon layer, which will affect the dye degradation efficiency of the subsequent dyeing and printing wastewater.

[0005] Therefore, how to design a dye degradation and recovery device that facilitates the chemical regeneration of activated carbon has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] This application provides a dye degradation and recovery device for dyeing and printing wastewater, so as to at least solve the above-mentioned technical problems existing in the prior art.

[0007] A device for dye degradation and recovery in dyeing and printing wastewater is provided, including an adsorption tower with an activated carbon layer inside the tower.

[0008] The conveying mechanism is arranged along the axial direction of the adsorption tower. The feed end of the conveying mechanism is inserted into the activated carbon layer, and the output end of the conveying mechanism is located at the top of the activated carbon layer and outputs the activated carbon particles out of the adsorption tower.

[0009] The reflux mechanism is arranged along the axial direction of the adsorption tower. The bottom of the reflux mechanism is connected to the activated carbon layer to continuously feed the treated activated carbon particles to the activated carbon layer.

[0010] The stirring mechanism is fixedly connected to the rotating shaft of the conveying mechanism. The stirring mechanism is installed inside the activated carbon layer to achieve stirring of the activated carbon particles.

[0011] In one embodiment, the device includes a sealing ring plate horizontally installed on the inner wall of the adsorption tower. The sealing ring plate has a first permeation hole for wastewater to pass through. It also includes an upward-opening support cone seat. The sealing ring plate is installed at the opening of the support cone seat to encapsulate the activated carbon particles.

[0012] In one embodiment, the support cone includes a flow guiding zone and a permeation zone. The permeation zone is located at the bottom of the support cone. The flow guiding zone and the permeation zone are connected to guide activated carbon particles to the permeation zone. The permeation zone is provided with a plurality of second permeation holes.

[0013] In one embodiment, the feeding mechanism further includes a feeding pipe, a motor, and a spiral blade. The feeding pipe is arranged along the axial direction of the adsorption tower. A feeding gap is left between the bottom of the feeding pipe and the bottom wall of the supporting cone for the activated carbon particles to enter. The rotating shaft is installed in the inner cavity of the feeding pipe. The spiral blade is fixedly installed on the rotating shaft. The edge of the spiral blade abuts against the inner wall of the feeding pipe. The output shaft of the motor is fixedly connected to the rotating shaft.

[0014] In one embodiment, the top of the conveying pipe is sealed, the motor is fixedly installed on the conveying pipe, a discharge port is opened on the top side wall of the conveying pipe, and a guide pipe is also included. One end of the guide pipe is connected to the discharge port, and the other end of the guide pipe extends out of the adsorption tower.

[0015] In one embodiment, the top sidewall of the conveying pipe is provided with a number of drainage holes.

[0016] In one embodiment, the stirring mechanism includes stirring blades, which are fixedly mounted on a rotating shaft.

[0017] In one embodiment, the reflux mechanism includes a reflux pipe, which is sleeved on the outside of the conveying mechanism. The top sidewall of the reflux pipe is fixedly connected to the inner wall of the adsorption tower, and the bottom sidewall of the reflux pipe is fixedly connected to the sealing ring plate. A reflux channel for activated carbon particles to enter is formed between the inner wall of the reflux pipe and the outer wall of the conveying mechanism.

[0018] In one embodiment, a guide plate is also included. The guide plate is installed at the bottom of the inner cavity of the return pipe and is fixedly connected to the outer wall of the feed pipe. A guide channel is provided between the outer wall of the guide plate and the inner wall of the return pipe for guiding the activated carbon particles. The return channel is connected to the guide channel.

[0019] In one embodiment, the system further includes an inlet pipe and an outlet pipe. The outlet pipe is installed on the bottom wall of the adsorption tower and communicates with the inner cavity of the adsorption tower. The inlet pipe is installed on the side wall of the adsorption tower and communicates with the inner cavity of the adsorption tower. The inlet pipe is located above the activated carbon layer and below the drain hole.

[0020] Compared with existing technologies, the dye degradation and recovery device for dyeing and printing wastewater disclosed in this application has the following advantages:

[0021] This application utilizes an activated carbon layer inside an adsorption tower to degrade dyes in dyeing and printing wastewater, reducing the wastewater's color. A conveying mechanism transports activated carbon particles from the bottom of the activated carbon layer upwards and out of the adsorption tower, facilitating chemical regeneration and enabling the recycling of activated carbon particles. A reflux mechanism returns the treated activated carbon particles back into the activated carbon layer, replenishing them and addressing the issue of reduced activated carbon particles affecting dye degradation efficiency. The rotating shaft of the conveying mechanism drives a stirring mechanism within the activated carbon layer, moving the activated carbon particles and improving their adsorption effect on dyes. Compared to existing technologies where activated carbon particles are difficult to remove from the adsorption tower and chemical regeneration is impossible, this application achieves cyclical movement of activated carbon particles, improving the treatment efficiency of activated carbon in dyeing and printing wastewater and enabling continuous wastewater treatment.

[0022] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0023] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which:

[0024] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0025] Figure 1 A schematic diagram of the overall structure of this application is shown;

[0026] Figure 2 A cross-sectional view of this application is shown;

[0027] Figure 3 This application shows Figure 2 A magnified structural diagram of A in the middle;

[0028] Figure 4 A schematic diagram of the internal structure of the adsorption tower of this application is shown;

[0029] Figure 5 A partial unfolded schematic diagram of this application is shown;

[0030] Figure 6A schematic diagram of the material conveying mechanism of this application is shown;

[0031] Figure 7 A schematic diagram of the material conveying mechanism of this application is shown.

[0032] Explanation of the labels in the diagram:

[0033] 1. Adsorption tower; 11. Inlet pipe; 12. Outlet pipe;

[0034] 2. Activated carbon layer; 21. Sealing ring plate; 211. First permeation hole;

[0035] 3. Conveying mechanism; 31. Rotating shaft; 32. Conveying pipe; 321. Drainage hole; 33. Motor; 34. Spiral blades; 35. Feed gap; 36. Discharge port; 37. Guide pipe;

[0036] 4. Reflux mechanism; 41. Reflux pipe; 42. Reflux channel; 43. Guide channel; 44. Reflux chamber;

[0037] 5. Agitator mechanism; 51. Agitator blades;

[0038] 6. Support cone seat; 61. Flow guiding zone; 62. Permeation zone; 621. Second permeation hole;

[0039] 7. Deflector plate. Detailed Implementation

[0040] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] like Figure 1 As shown, the adsorption tower 1 includes an inlet pipe 11 and an outlet pipe 12 installed on the adsorption tower 1. Specifically, the outlet pipe 12 is installed on the bottom wall of the adsorption tower 1 and communicates with the inner cavity of the adsorption tower 1, and the treated dyeing and printing wastewater is discharged through the outlet pipe 12; the inlet pipe 11 is installed on the side wall of the adsorption tower 1 and communicates with the inner cavity of the adsorption tower 1, and the dyeing and printing wastewater to be treated is injected into the inner cavity of the adsorption tower 1 through the inlet pipe 11.

[0042] In order to achieve the degradation of dyes in dyeing and printing wastewater, in this embodiment, such as Figure 2 As shown, it also includes an activated carbon layer 2, which is disposed in the inner cavity of the adsorption tower 1 and located below the water inlet pipe 11.

[0043] With the above setup, when the dyeing and printing wastewater enters the inner cavity of the adsorption tower 1 from the inlet pipe 11, the wastewater passes through the activated carbon layer 2 and continues to permeate downwards, and then is discharged from the adsorption tower 1 from the outlet pipe 12. When the wastewater passes through the activated carbon layer 2, the dyeing and printing dyes in the wastewater are adsorbed by the activated carbon particles, thus completing the adsorption and degradation of the dyes in the wastewater.

[0044] Specifically, in order to achieve the encapsulation of activated carbon particles, in this embodiment, as follows: Figure 3 , Figure 4 and Figure 5 As shown, the activated carbon layer 2 includes a sealing ring plate 21 and a supporting cone 6. The opening of the supporting cone 6 faces upward, and the longitudinal section of the supporting cone 6 is funnel-shaped. The funnel-shaped opening is large at the top and small at the bottom. The side wall of the supporting cone 6 is fixedly connected to the inner wall of the adsorption tower 1, and the activated carbon particles are supported by the supporting cone 6.

[0045] The sealing ring plate 21 is fixedly installed at the opening at the top of the supporting cone 6, thereby encapsulating the activated carbon particles inside the supporting cone 6 and preventing the dyeing wastewater from washing away the activated carbon particles.

[0046] In order to allow the dyeing and printing wastewater to pass through the activated carbon layer 2, in this embodiment, as follows: Figure 3 As shown, the sealing ring plate 21 is provided with a number of first permeation holes 211, and the supporting cone seat 6 is provided with a number of second permeation holes 621. When the dyeing and printing wastewater enters the inner cavity of the adsorption tower 1 from the inlet pipe 11, the dyeing and printing wastewater enters the activated carbon layer 2 through the first permeation holes 211 and comes into contact with the activated carbon particles. Then, the treated wastewater seeps out of the activated carbon layer 2 through the second permeation holes 621, and the treated wastewater flows out of the adsorption tower 1 through the outlet pipe 12.

[0047] Specifically, such as Figure 3 and Figure 4 As shown, the supporting cone seat 6 is also provided with a flow guiding area 61, wherein the flow guiding area 61 is not provided with a second permeation hole 621, and the permeation area 62 is located at the bottom of the supporting cone seat 6. The wastewater and activated carbon particles in the activated carbon layer 2 are guided to the position of the flow guiding area 61 by the flow guiding area 61.

[0048] Since the guide zone 61 does not have a second permeation hole 621, the guide zone 61 extends the distance between the second permeation hole 621 and the first permeation hole 211 to ensure that the wastewater flows slowly through the activated carbon layer 2, allowing time for the activated carbon particles to adsorb pigments.

[0049] After conventional activated carbon granules are encapsulated inside the activated carbon layer 2, the activated carbon granules are difficult to move and also difficult to remove from the adsorption tower 1. After long-term operation, the surface of the activated carbon granules is covered with pigments, which affects the degradation effect of the dyes. Therefore, chemical regeneration treatment of activated carbon granules is required to save costs.

[0050] In this embodiment, as Figure 2 and Figure 3 As shown, it also includes a conveying mechanism 3, which is arranged along the axial direction of the adsorption tower 1. The bottom of the conveying mechanism 3 extends to the activated carbon layer 2 to transfer the activated carbon particles in the activated carbon layer 2. The top of the conveying mechanism 3 transfers the activated carbon particles to the outside of the adsorption tower 1, thereby chemically regenerating the activated carbon particles. In this embodiment, the chemical regeneration process refers to soaking the activated carbon particles in an alkaline solution or an oxidant to wash off the dyes on the activated carbon and restore the functional groups on the activated carbon particles.

[0051] Specifically, such as Figure 6 and Figure 7 As shown, the material conveying mechanism 3 includes a rotating shaft 31, a material conveying pipe 32, a motor 33, and a spiral blade 34, wherein, as... Figure 2 and Figure 3 As shown, the conveying pipe 32 has a tubular structure, with the top of the conveying pipe 32 closed and the bottom open. The conveying pipe 32 is arranged along the axial direction of the adsorption tower 1. A feed gap 35 is reserved between the bottom of the conveying pipe 32 and the bottom wall of the supporting cone seat 6 for the activated carbon particles to enter the conveying pipe 32. The rotating shaft 31 is rotatably installed in the inner cavity of the conveying pipe 32. The output shaft of the motor 33 is fixedly connected to the rotating shaft 31. The motor 33 is fixedly installed on the conveying pipe 32. The spiral blade 34 is fixedly installed on the rotating shaft 31.

[0052] With the above configuration, the motor 33 drives the rotating shaft 31 to rotate, which in turn drives the spiral blades 34 to rotate. The activated carbon particles inside the activated carbon layer 2 are guided by the inner wall of the supporting cone seat 6 and enter the feed pipe 32 through the feed gap 35. The spiral blades 34 are used to transport the activated carbon particles upward and transfer them from the top of the feed pipe 32 to the outside of the adsorption tower 1 for chemical regeneration treatment of the activated carbon particles.

[0053] Furthermore, in order to transfer the activated carbon particles from the feed pipe 32 to the outside of the adsorption tower 1, in this embodiment, as follows: Figure 5 and Figure 6 As shown, a discharge port 36 is provided on the side wall at the top of the conveying pipe 32, and a guide pipe 37 is also included. One end of the guide pipe 37 is connected to the discharge port 36, and the other end of the guide pipe 37 extends to the outside of the adsorption tower 1. When the spiral blades 34 convey the activated carbon particles to the top of the conveying pipe 32, the activated carbon particles are discharged from the discharge port 36 into the guide pipe 37, and then the activated carbon particles are guided to the outside of the adsorption tower 1 through the guide pipe 37.

[0054] Since the activated carbon layer 2 is immersed in dyeing and printing wastewater, when the spiral blades 34 drive the activated carbon particles upward, they will also cause the wastewater to move upward synchronously. At this time, the wastewater can easily flow out of the adsorption tower 1 from the discharge port 36 and the guide pipe 37. Therefore, in this embodiment, as Figure 2 , Figure 5 and Figure 6 As shown, the side wall of the conveying pipe 32 is provided with several drainage holes 321. It is worth noting that the drainage holes 321 are located above the water inlet pipe 11.

[0055] With this configuration, when the spiral blades 34 drive the activated carbon particles upward to the position of the drain hole 321, the wastewater flows out of the feed pipe 32 through the drain hole 321, so that the wastewater flows back into the inner cavity of the adsorption tower 1, and avoids the wastewater from flowing out of the guide pipe 37.

[0056] To improve the adsorption effect of activated carbon particles on dyes in activated carbon layer 2, in this embodiment, as follows: Figure 2 , Figure 3 and Figure 5 As shown, it also includes a stirring mechanism 5 installed in the activated carbon layer 2. The stirring mechanism 5 is connected to the rotating shaft 31 to stir the activated carbon particles in the activated carbon layer 2, so that the dye and the activated carbon particles are in full contact, thereby improving the adsorption effect of the dye.

[0057] Specifically, the stirring mechanism 5 includes stirring blades 51, wherein several stirring blades 51 are provided and fixedly installed on the rotating shaft 31.

[0058] When the activated carbon particles in activated carbon layer 2 are transferred to the outside of adsorption tower 1 through the conveying mechanism 3, the number of activated carbon particles in activated carbon layer 2 decreases, which will reduce the cleaning efficiency of dyes in wastewater. Therefore, it is necessary to replenish the activated carbon layer 2 with chemically regenerated activated carbon particles to keep the activated carbon layer 2 full.

[0059] Specifically, such as Figure 2 and Figure 4 As shown, it also includes a reflux mechanism 4, which is sleeved on the outside of the conveying mechanism 3. The reflux mechanism 4 includes a reflux pipe 41. The top side wall of the reflux pipe 41 is fixedly connected to the inner wall of the adsorption tower 1, and the bottom of the reflux pipe 41 is fixedly connected to the sealing ring plate 21. A reflux channel 42 for activated carbon particles to enter is reserved between the inner wall of the reflux pipe 41 and the outer wall of the conveying pipe 32. The bottom of the reflux channel 42 is connected to the activated carbon layer 2.

[0060] The top of the reflux pipe 41 is provided with a reflux chamber 44, which is used to place the activated carbon particles to be refluxed.

[0061] The opening at the top of activated carbon layer 2 is relatively large, and the activated carbon particles will gather towards the bottom center under the action of the supporting cone 6. In order to allow the recirculated activated carbon particles to stay in activated carbon layer 2 for a longer period of time, such as... Figure 2 and Figure 3 As shown, it also includes a guide plate 7, which is installed at the bottom of the inner cavity of the return pipe 41. The side wall of the guide plate 7 is fixedly abutted against the outer wall of the conveying pipe 32. The guide plate 7 and the inner wall of the return pipe 41 form a guide channel 43, wherein the return channel 42 and the guide channel 43 are connected, thereby conveying the activated carbon particles into the activated carbon layer 2 to replenish the activated carbon particles.

[0062] It is worth noting that the speed at which the reflux mechanism 4 replenishes activated carbon particles into the activated carbon layer 2 is consistent with the speed at which the conveying mechanism 3 transfers activated carbon particles out of the adsorption tower 1, thereby achieving a dynamic balance of activated carbon particles.

[0063] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0065] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dye degradation and recovery device for dyeing and printing wastewater, comprising an adsorption tower (1), wherein an activated carbon layer (2) is disposed in the inner cavity of the adsorption tower (1), characterized in that, The conveying mechanism (3) is arranged along the axial direction of the adsorption tower (1). The feed end of the conveying mechanism (3) is inserted into the activated carbon layer (2). The output end of the conveying mechanism (3) is located at the top of the activated carbon layer (2) and outputs the activated carbon particles out of the adsorption tower (1). The reflux mechanism (4) is arranged along the axial direction of the adsorption tower (1). The bottom of the reflux mechanism (4) is connected to the activated carbon layer (2) to continuously deliver the processed activated carbon particles to the activated carbon layer (2). The stirring mechanism (5) is fixedly connected to the rotating shaft (31) of the conveying mechanism (3). The stirring mechanism (5) is installed in the activated carbon layer (2) to achieve stirring of the activated carbon particles.

2. A device for degradation and recovery of dyes in printing and dyeing wastewater according to claim 1, characterized in that, It includes a sealing ring plate (21) horizontally installed on the inner wall of the adsorption tower (1), the sealing ring plate (21) having a first permeation hole (211) for wastewater to pass through, and a support cone seat (6) with the opening facing upward. The sealing ring plate (21) is installed at the opening of the support cone seat (6) to achieve the encapsulation of activated carbon particles.

3. A device for degradation and recovery of dyes in printing and dyeing wastewater according to claim 2, characterized in that, The support cone (6) includes a flow guiding zone (61) and a permeation zone (62). The permeation zone (62) is located at the bottom of the support cone (6). The flow guiding zone (61) and the permeation zone (62) are connected to guide the activated carbon particles to the permeation zone (62). The permeation zone (62) is provided with a number of second permeation holes (621).

4. A device for degradation and recovery of dyes in printing and dyeing wastewater according to claim 2, characterized in that, The conveying mechanism (3) also includes a conveying pipe (32), a motor (33), and a spiral blade (34). The conveying pipe (32) is arranged along the axial direction of the adsorption tower (1). A feeding gap (35) is left between the bottom of the conveying pipe (32) and the bottom wall of the supporting cone (6) for the activated carbon particles to enter. The rotating shaft (31) is installed in the inner cavity of the conveying pipe (32). The spiral blade (34) is fixedly installed on the rotating shaft (31). The edge of the spiral blade (34) abuts against the inner wall of the conveying pipe (32). The output shaft of the motor (33) is fixedly connected to the rotating shaft (31).

5. A device for degradation and recovery of dyes in printing and dyeing wastewater according to claim 4, characterized in that, The top of the conveying pipe (32) is sealed, and the motor (33) is fixedly installed on the conveying pipe (32). The top side wall of the conveying pipe (32) is provided with a discharge port (36), and it also includes a guide pipe (37). One end of the guide pipe (37) is connected to the discharge port (36), and the other end of the guide pipe (37) extends out of the adsorption tower (1).

6. The dye degradation and recovery device for dyeing and printing wastewater according to claim 4, characterized in that, The top side wall of the conveying pipe (32) is provided with several drainage holes (321).

7. A dye degradation and recovery device for dyeing and printing wastewater according to claim 1, 4, or 6, characterized in that, The stirring mechanism (5) includes stirring blades (51), which are fixedly mounted on the rotating shaft (31).

8. A dye degradation and recovery device for dyeing and printing wastewater according to claim 4 or 6, characterized in that, The reflux mechanism (4) includes a reflux pipe (41), which is sleeved on the outside of the conveying mechanism (3). The top side wall of the reflux pipe (41) is fixedly connected to the inner wall of the adsorption tower (1), and the bottom side wall of the reflux pipe (41) is fixedly connected to the sealing ring plate (21). A reflux channel (42) for activated carbon particles to enter is formed between the inner wall of the reflux pipe (41) and the outer wall of the conveying mechanism (3).

9. The dye degradation and recovery device for dyeing and printing wastewater according to claim 8, characterized in that, It also includes a guide plate (7), which is installed at the bottom of the inner cavity of the return pipe (41). The guide plate (7) is fixedly connected to the outer wall of the feed pipe (32). The outer wall of the guide plate (7) and the inner wall of the return pipe (41) leave a guide channel (43) for guiding the activated carbon particles. The return channel (42) is connected to the guide channel (43).

10. The dye degradation and recovery device in dyeing and printing wastewater according to claim 6, characterized in that, It also includes an inlet pipe (11) and an outlet pipe (12). The outlet pipe (12) is installed on the bottom wall of the adsorption tower (1) and communicates with the inner cavity of the adsorption tower (1). The inlet pipe (11) is installed on the side wall of the adsorption tower (1) and communicates with the inner cavity of the adsorption tower (1). The inlet pipe (11) is located above the activated carbon layer (2) and below the drain hole (321).

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