Acrylic fiber sewage and sludge drying waste gas treatment device

Abstract

The utility model belongs to the technical field of waste gas treatment, and particularly relates to an acrylic fiber sewage and sludge drying waste gas treatment device. The technology comprises a waste gas leaching device, wherein a waste gas leaching tower and a biological filter bed are sequentially arranged at the rear end of the waste gas leaching device; a gas inlet in the bottom of the waste gas leaching device is connected with a dryer waste gas pipeline; a dryer waste gas collecting centrifugal fan is mounted on the dryer waste gas pipeline; a gas outlet in the top of the waste gas leaching device is communicated with a gas inlet of the waste gas leaching tower through a leached waste gas pipeline; a gas outlet at the top of the waste gas leaching tower is communicated with a gas inlet of the biological filter bed through a waste gas gathering pipeline, a high-flow centrifugal exhaust fan is mounted on the waste gas gathering pipeline, and a sewage waste gas conveying pipeline is connected to the waste gas gathering pipeline; a top air outlet of the biological filter bed is connected with an atmosphere duct through a pipeline. According to the utility model, toxic and harmful waste gas around the sewage pool and the sludge dryer can be effectively collected and treated, and the treated waste gas meets the emission requirement.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment, in particular to a waste gas treatment device for acrylic fiber sewage and sludge drying. Background Art

[0002] Acrylic, also known as polyacrylonitrile fiber, is a synthetic fiber with properties similar to wool, so it is called "synthetic wool". The main uses of acrylic include civilian textiles, such as wool yarn, blankets, sportswear, artificial fur, bulky yarn, plush, hose, parasol cloth, etc. Acrylic fiber occupies an important position in the chemical fiber industry due to its excellent properties and wide range of applications. With the continuous advancement of technology, the application scope and market prospects of acrylic fiber will continue to expand.

[0003] During the production of acrylic fiber, sewage and sludge are generated. In order to meet environmental protection requirements, it is necessary to build sewage pools and install facilities such as sludge dryers around the production line. Through these facilities, the sewage is treated and discharged to the sewage treatment plant. The solid waste after drying by the sludge dryer is sent to the solid waste manufacturer designated by the environmental protection department for treatment. However, there is a large accumulation of toxic and harmful waste gases around sewage pools and sludge dryers, and the odor is heavy, making it very uncomfortable for people to breathe when entering the relevant areas. Summary of the invention

[0004] The purpose of the utility model is to provide an acrylic fiber sewage and sludge drying waste gas treatment device, which can collect and treat the toxic and harmful waste gas around the sewage pool and the sludge drying machine.

[0005] The acrylic fiber wastewater and sludge drying waste gas treatment device comprises a waste gas elution device, and a waste gas elution tower and a biological filter bed are sequentially arranged at the rear end of the process of the waste gas elution device;

[0006] The exhaust gas washing device is connected to a dryer exhaust gas pipeline at the bottom air inlet, and a dryer exhaust gas collecting centrifugal fan for conveying the dryer exhaust gas to the exhaust gas washing device is installed on the dryer exhaust gas pipeline;

[0007] The gas outlet at the top of the waste gas washing device is connected to the gas inlet of the waste gas washing tower through the waste gas pipeline after washing;

[0008] The outlet gas at the top of the waste gas leaching tower is connected to the air inlet of the biofilter bed through a waste gas collection pipeline. A large-flow centrifugal exhaust fan for pumping waste gas into the biofilter bed is installed on the waste gas collection pipeline. The waste gas collection pipeline is connected to a sewage waste gas delivery pipeline for collecting odor from the sludge sedimentation tank.

[0009] The air outlet on the top of the biofilter bed is connected to an atmospheric air duct through a pipeline.

[0010] Furthermore, the waste gas scrubbing device is a PP material scrubbing tower, the middle part of the tower is a first packing layer, the first packing layer divides the waste gas scrubbing device from top to bottom into a first spray area and a first spray water recovery area, and a first spray system for spraying to the first spray area is installed between the first spray area and the first spray water recovery area. The air inlet on the waste gas scrubbing device is located on the waste gas scrubbing device below the first packing layer.

[0011] Furthermore, the waste gas scrubbing tower is a PP material scrubbing tower, the middle part of the tower is a second packing layer, the second packing layer divides the waste gas scrubbing tower from top to bottom into a second spray area and a second spray water recovery area, and a second spray system for spraying into the second spray area is installed between the second spray area and the second spray water recovery area, and the air inlet on the waste gas scrubbing tower is located on the waste gas scrubbing tower below the second packing layer.

[0012] Furthermore, the first spray system includes a rinse circulation pipeline, and a plurality of first nozzles for spraying the first filler layer are arranged in the first spray area. The water outlet end of the rinse circulation pipeline is inserted into the first spray area and connected to the first nozzle, and the water inlet end of the rinse circulation pipeline is connected to the first spray water recovery area. A rinse circulation pump for transporting the spray liquid in the first spray water recovery area to the first nozzle is installed on the rinse circulation pipeline.

[0013] Furthermore, the second spray system includes a leaching tower spray circulation pipeline, and a plurality of second nozzles for spraying the second packing layer are arranged in the second spray area. The water outlet end of the leaching tower spray circulation pipeline is inserted into the second spray area and connected to the second nozzle, and the water inlet end of the leaching tower spray circulation pipeline is connected to the second spray water recovery area. A leaching tower spray water pump for transporting water in the second spray water recovery area to the second nozzle is installed on the leaching tower spray circulation pipeline, and a leaching tower water adding pipeline for adding water to the second spray water recovery area is connected under the exhaust gas leaching tower.

[0014] Furthermore, the biofilter bed is divided into a pre-washing section and a biological section from left to right, the pre-washing section is connected to the biological section, and the gas outlet on the biofilter bed is located at the top of the biological section;

[0015] A third packing layer is arranged in the pre-washing section, and the third packing layer divides the pre-washing section from top to bottom into a third spraying area and a third spray water recovery area. A third spraying system for spraying the third spraying area is installed between the third spraying area and the third spray water recovery area, and the air inlet on the biological filter bed is located at the pre-washing section below the third packing layer;

[0016] A fourth filler layer is arranged in the biological section, and the fourth filler layer divides the biological section from top to bottom into a fourth spraying area and a fourth spray water recovery area. A fourth spray system for spraying to the fourth spraying area is installed between the fourth spraying area and the fourth spray water recovery area.

[0017] Furthermore, the third spray system includes a pre-wash section water supply pipeline, on which a pre-wash section spray water pump is installed, and a plurality of third nozzles for spraying the third filler layer are arranged in the third spray water recovery area. The water outlet end of the pre-wash section water supply pipeline is inserted into the pre-wash section and connected to the third nozzle, and the third spray water recovery area is connected to the pre-wash section water supply pipeline of the inlet section of the pre-wash section spray water pump through the pre-wash section circulation pipeline.

[0018] Furthermore, the fourth spray system includes a biological segment water supply pipeline, a biological segment spray water pump is installed on the biological segment water supply pipeline, a plurality of fourth nozzles for spraying the fourth filler layer are arranged in the fourth spray water recovery area, the water outlet end of the biological segment water supply pipeline is inserted into the biological segment and connected to the fourth nozzle, and the fourth spray water recovery area is connected to the biological segment water supply pipeline of the inlet section of the biological segment spray water pump through the biological segment circulation pipeline.

[0019] Furthermore, a section of FRP air duct pipeline is provided at the air inlet end of the sewage and waste gas conveying pipeline, and a piece of white membrane cloth that can seal the top of the sludge sedimentation tank is connected to the air inlet end of the FRP air duct pipeline, and a detachable maintenance channel is left on the white membrane cloth.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model can effectively collect and treat toxic and harmful waste gases around sewage pools and sludge dryers under the coordinated design of waste gas elution devices, waste gas elution towers and biological filter beds, and the treated waste gases meet emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the process flow of the utility model;

[0023] The names of the components in the figure are: 1. Dryer exhaust pipeline; 2. Dryer exhaust collection centrifugal fan; 3. Exhaust gas elution device; 4. Elution circulation pump; 5. Exhaust gas pipeline after elution; 6. Sewage exhaust gas transportation pipeline; 7. Elution tower water supply pipeline; 8. Exhaust gas elution tower; 9. Exhaust gas collection pipeline; 10. Large-flow centrifugal exhaust fan; 11. Pre-wash section; 12. Biofilter bed; 13. Biosection; 14. Atmospheric air duct; 15. Biosection water supply pipeline; 16. Biosection spray water pump; 17. Pre-wash section water supply pipeline; 18. Pre-wash section spray water pump; 19. Elution tower spray circulation pipeline; 20. Elution tower spray water pump; 21. Elution circulation pipeline. DETAILED DESCRIPTION

[0024] The present invention is further described below through specific embodiments in conjunction with the accompanying drawings, but the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Example

[0025] The acrylic fiber wastewater and sludge drying waste gas treatment device described in this embodiment is as follows: Figure 1 As shown, it includes a waste gas elution device 3, and the waste gas elution device 3 is provided with a waste gas elution tower 8 and a biological filter bed 12 in sequence at the rear end of the process; the bottom air inlet of the waste gas elution device 3 is connected to the dryer waste gas pipeline 1, and the dryer waste gas pipeline 1 is installed with a dryer waste gas collecting centrifugal fan 2 for conveying the dryer waste gas to the inside of the waste gas elution device 3; the top air outlet of the waste gas elution device 3 is connected to the air inlet of the waste gas elution tower 8 through the post-elution waste gas pipeline 5; the top outlet gas of the waste gas elution tower 8 is connected to the air inlet of the biological filter bed 12 through the waste gas collection pipeline 9, and the waste gas collection pipeline 9 is installed with a large-flow centrifugal exhaust fan 10 for pumping the waste gas into the biological filter bed 12, and the waste gas collection pipeline 9 is connected with a sewage waste gas conveying pipeline 6 for collecting the odor of the sludge sedimentation tank; the top air outlet of the biological filter bed 12 is connected to the atmospheric air duct 14 through a pipeline.

[0026] This embodiment further illustrates the technology. The waste gas washing device 3 is a PP material washing tower. The middle part of the tower is the first packing layer. The first packing layer divides the waste gas washing device 3 from top to bottom into a first spraying area and a first spray water recovery area. A first spray system for spraying to the first spraying area is installed between the first spraying area and the first spray water recovery area. The air inlet on the waste gas washing device 3 is located on the waste gas washing device 3 below the first packing layer. The first spray system includes a washing circulation pipeline 21. In the first spraying area, a plurality of first nozzles for spraying to the first packing layer are arranged. The water outlet end of the washing circulation pipeline 21 is inserted into the first spraying area and connected to the first nozzle. The water inlet end of the washing circulation pipeline 21 is connected to the first spray water recovery area. A washing circulation pump 4 for transporting the spray liquid in the first spray water recovery area to the first nozzle is installed on the washing circulation pipeline 21.

[0027] This embodiment further illustrates the technology. The waste gas scrubbing tower 8 is a PP material scrubbing tower. The middle part of the tower is a second packing layer. The second packing layer divides the waste gas scrubbing tower 8 from top to bottom into a second spraying area and a second spray water recovery area. A second spray system for spraying into the second spraying area is installed between the second spraying area and the second spray water recovery area. The air inlet on the waste gas scrubbing tower 8 is located on the waste gas scrubbing tower 8 below the second packing layer. The second spray system includes a leaching tower spray circulation pipeline 19, and a plurality of second nozzles for spraying the second packing layer are arranged in the second spray area. The water outlet end of the leaching tower spray circulation pipeline 19 is inserted into the second spray area and connected to the second nozzle, and the water inlet end of the leaching tower spray circulation pipeline 19 is connected to the second spray water recovery area. A leaching tower spray water pump 20 for transporting water in the second spray water recovery area to the second nozzle is installed on the leaching tower spray circulation pipeline 19, and a leaching tower water adding pipeline 7 for adding water to the second spray water recovery area is connected below the exhaust gas leaching tower 8.

[0028] This embodiment further illustrates the technology. The biological filter bed 12 is divided into a pre-washing section 11 and a biological section 13 from left to right. The pre-washing section 11 is connected to the biological section 13. The air outlet on the biological filter bed 12 is located at the top of the biological section 13.

[0029] A third packing layer is arranged in the pre-wash section 11, and the third packing layer divides the pre-wash section 11 from top to bottom into a third spraying area and a third spray water recovery area. A third spray system for spraying the third spray area is installed between the third spraying area and the third spray water recovery area, and the air inlet on the biological filter bed 12 is located at the pre-wash section 11 below the third packing layer; the third spray system includes a pre-wash section water supply pipeline 17, and a pre-wash section spray water pump 18 is installed on the pre-wash section water supply pipeline 17. A plurality of third nozzles for spraying the third packing layer are arranged in the third spray water recovery area, and the water outlet end of the pre-wash section water supply pipeline 17 is inserted into the pre-wash section 11 and connected to the third nozzle, and the third spray water recovery area is connected to the pre-wash section water supply pipeline 17 of the inlet section of the pre-wash section spray water pump 18 through the pre-wash section circulation pipeline.

[0030] A fourth packing layer is arranged in the biological segment 13, and the fourth packing layer divides the biological segment 13 from top to bottom into a fourth spraying area and a fourth spray water recovery area, and a fourth spray system for spraying the fourth spray area is installed between the fourth spraying area and the fourth spray water recovery area. The fourth spray system includes a biological segment water supply pipeline 15, on which a biological segment spray water pump 16 is installed, and a plurality of fourth nozzles for spraying the fourth packing layer are arranged in the fourth spray water recovery area, and the water outlet end of the biological segment water supply pipeline 15 is inserted into the biological segment 13 and connected to the fourth nozzle, and the fourth spray water recovery area is connected to the biological segment water supply pipeline 15 of the inlet section of the biological segment spray water pump 16 through the biological segment circulation pipeline.

[0031] This embodiment further illustrates the technology. A section of fiberglass air duct pipeline is provided at the air inlet end of the sewage and waste gas conveying pipeline 6. A piece of white membrane cloth that can close the top of the sludge sedimentation tank is connected to the air inlet end of the fiberglass air duct pipeline, and a detachable maintenance channel is left on the white membrane cloth.

[0032] The above-mentioned PP material is also called polypropylene, which is the English abbreviation of polypropylene.

[0033] The waste gas treated in this embodiment mainly includes two parts:

[0034] One is that a large amount of odor is generated when the sludge dryer is dried in the existing process. After being collected and summarized by the on-site exhaust hood, it enters the dryer exhaust gas collection centrifugal fan 2 through the dryer exhaust gas pipeline 1 and is sent to the exhaust gas leaching device 3. Alkaline liquid is added to the first spray water recovery area. An inlet for regularly replenishing alkali liquid is set in the exhaust gas leaching device 3. The exhaust gas enters the filler gap from the lower part of the first filler layer and contacts with the alkaline spray liquid sprayed from the top, and some acidic substances in the exhaust gas are preliminarily cleaned. The alkaline liquid is pumped into the top first nozzle by the leaching circulation pump 4 for circulating leaching. The pH value of the alkaline liquid in the exhaust gas leaching device 3 is monitored to be within the range of 6-9. When it exceeds the range, especially when the pH value is low, the liquid in the first spray water recovery area is discharged. The method adopted is to set a sewage pipeline at the bottom of the exhaust gas leaching device 3, install a sewage valve on the sewage pipeline, discharge sewage by controlling the sewage valve, close the sewage valve after sewage discharge, and re-add alkaline liquid for the next spray cycle after sewage discharge. The waste gas treated by the waste gas washing device 3 enters the waste gas washing tower 8 from the top outlet. The main function of the waste gas washing tower 8 is to quickly reduce the temperature of the waste gas through circulating spraying, so as to facilitate entering the final biological filter bed 12. The second spray water recovery area in the waste gas washing tower 6 contains tap water or reclaimed water. The spray water pump 20 of the washing tower continuously pumps the spray water into the second nozzle to wash the waste gas passing through the second packing area. The second packing layer is preferably PP spherical packing with a diameter of about 5 cm. The turbidity of the circulating spray water quality is monitored. If it exceeds the standard, the spray water in the second spray water recovery area is replaced. It can also be set up as the waste gas washing device 3. A sewage pipeline is set at the bottom of the waste gas washing tower 8, and a sewage valve is installed on the sewage pipeline. The sewage is discharged by controlling the sewage valve. After the sewage is discharged, the sewage valve is closed, and the washing tower water supply pipeline 7 is opened to replenish water, and the next spray cycle is started. The cooled waste gas discharged from the top of the waste gas leaching tower 8 enters the large-flow centrifugal exhaust fan 10 and is sent to the biological filter bed 12 for the final treatment process.

[0035] Secondly, the odor from the sludge sedimentation tank is collected through the waste gas conveying pipeline 6 and the waste gas collecting pipeline 9, and then sent to the most critical biological filter bed 12 for biological treatment through a large-flow centrifugal exhaust fan 10.

[0036] In the biological filter bed 12 process, it first enters the pre-washing section 11 (generally a fiberglass box). A large number of spherical plastics of about 10 cm in diameter are installed in the pre-washing section 11 as the third filler layer. The waste gas entering the pre-washing section 11 is continuously sprayed and cleaned through the third nozzle. The pH value is monitored between 6 and 9. If it exceeds the range, the water in the third spray water recovery area is replaced. As with the setting of the waste gas washing device 3, a sewage pipeline is set at the bottom of the pre-washing section 11, and a sewage valve is installed on the sewage pipeline. After the sewage is discharged, the sewage valve is closed, and tap water or reclaimed water is replenished to carry out the next spray cycle.

[0037] After the pre-washing section 11 is sprayed and cleaned, the waste gas enters the biological section 13 (usually from the top of the pre-washing section 11 to the bottom of the biological section 13). The fourth packing layer of the biological section 13 is composed of a large amount of volcanic rock. The fourth nozzle is sprayed intermittently downward by the biological section spray water pump 16 (depending on the process requirements). The spraying is 2 minutes each time, and then the spraying is stopped for about 20 minutes. This cycle is repeated. The pH value is monitored between 6-9. If it exceeds the range, the water in the fourth spray water recovery area needs to be replaced. It can also be set up as the waste gas washing device 3. A sewage pipeline is set at the bottom of the biological section 13, and a sewage valve is installed on the sewage pipeline. After the sewage is discharged, the sewage valve is closed, and tap water or reclaimed water is replenished to carry out the next spray cycle. The waste gas treated by the biological filter bed 12 enters the atmospheric air duct 14. Environmental protection detection is carried out before the atmospheric air duct 14 is discharged into the atmosphere. If it meets the environmental protection requirements, it is discharged. Otherwise, the system needs to be shut down for inspection, analysis, and treatment.

Claims

1. An acrylic fiber wastewater and sludge drying waste gas treatment device, comprising a waste gas elution device (3), characterized in that: The waste gas washing device (3) is provided with a waste gas washing tower (8) and a biological filter bed (12) in sequence at the process rear end; The bottom air inlet of the exhaust gas elution device (3) is connected to a dryer exhaust gas pipeline (1), and the dryer exhaust gas pipeline (1) is equipped with a dryer exhaust gas collection centrifugal fan (2) for conveying the dryer exhaust gas to the inside of the exhaust gas elution device (3); The top gas outlet of the waste gas leaching device (3) is connected to the gas inlet of the waste gas leaching tower (8) through the post-leaching waste gas pipeline (5); The outlet gas from the top of the waste gas washing tower (8) is connected to the air inlet of the biological filter bed (12) through a waste gas collecting pipeline (9), and a large-flow centrifugal exhaust fan (10) for pumping waste gas into the biological filter bed (12) is installed on the waste gas collecting pipeline (9), and a sewage waste gas conveying pipeline (6) for collecting odor from the sludge sedimentation tank is connected to the waste gas collecting pipeline (9); The air outlet at the top of the biofilter bed (12) is connected to an atmospheric air duct (14) via a pipeline.

2. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 1, characterized in that: The waste gas washing device (3) is a PP material washing tower, the middle part of the tower is a first packing layer, the first packing layer divides the waste gas washing device (3) from top to bottom into a first spraying area and a first spray water recovery area, and a first spraying system for spraying to the first spraying area is installed between the first spraying area and the first spray water recovery area. The air inlet on the waste gas washing device (3) is located on the waste gas washing device (3) below the first packing layer.

3. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 1 or 2, characterized in that: The waste gas leaching tower (8) is a PP material leaching tower, the middle part of the tower is a second packing layer, the second packing layer divides the waste gas leaching tower (8) from top to bottom into a second spraying area and a second spray water recovery area, and a second spray system for spraying to the second spraying area is installed between the second spraying area and the second spray water recovery area, and the air inlet on the waste gas leaching tower (8) is located on the waste gas leaching tower (8) below the second packing layer.

4. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 2, characterized in that: The first spraying system comprises a rinse circulation pipeline (21), a plurality of first spray heads for spraying the first filler layer are arranged in the first spraying area, the water outlet end of the rinse circulation pipeline (21) is inserted into the first spraying area and connected to the first spray head, the water inlet end of the rinse circulation pipeline (21) is connected to the first spray water recovery area, and a rinse circulation pump (4) is installed on the rinse circulation pipeline (21) for transporting the spray liquid in the first spray water recovery area to the first spray head.

5. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 3, characterized in that: The second spray system comprises a leaching tower spray circulation pipeline (19), a plurality of second nozzles for spraying the second packing layer are arranged in the second spray area, the water outlet end of the leaching tower spray circulation pipeline (19) is inserted into the second spray area and connected to the second nozzle, the water inlet end of the leaching tower spray circulation pipeline (19) is connected to the second spray water recovery area, a leaching tower spray water pump (20) for conveying water in the second spray water recovery area to the second nozzle is installed on the leaching tower spray circulation pipeline (19), and a leaching tower water adding pipeline (7) for adding water to the second spray water recovery area is connected below the exhaust gas leaching tower (8).

6. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 1, characterized in that: The biological filter bed (12) is divided into a pre-washing section (11) and a biological section (13) from left to right, the pre-washing section (11) is connected to the biological section (13), and the air outlet on the biological filter bed (12) is located at the top of the biological section (13); A third packing layer is provided in the pre-wash section (11), and the third packing layer divides the pre-wash section (11) from top to bottom into a third spraying area and a third spray water recovery area. A third spraying system for spraying the third spraying area is installed between the third spraying area and the third spray water recovery area, and an air inlet on the biological filter bed (12) is located at the pre-wash section (11) below the third packing layer; A fourth filler layer is provided in the biological section (13), the fourth filler layer divides the biological section (13) from top to bottom into a fourth spraying area and a fourth spray water recovery area, and a fourth spraying system for spraying the fourth spraying area is installed between the fourth spraying area and the fourth spray water recovery area.

7. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 6, characterized in that: The third spray system comprises a pre-wash section water supply pipeline (17), a pre-wash section spray water pump (18) is installed on the pre-wash section water supply pipeline (17), a plurality of third spray heads for spraying the third filler layer are arranged in the third spray water recovery area, the water outlet end of the pre-wash section water supply pipeline (17) is inserted into the pre-wash section (11) and connected to the third spray heads, and the third spray water recovery area is connected to the pre-wash section water supply pipeline (17) at the inlet section of the pre-wash section spray water pump (18) through the pre-wash section circulation pipeline.

8. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 6, characterized in that: The fourth spraying system comprises a biological segment water supply pipeline (15), a biological segment spray water pump (16) is installed on the biological segment water supply pipeline (15), a plurality of fourth nozzles for spraying the fourth filler layer are arranged in the fourth spray water recovery area, the water outlet end of the biological segment water supply pipeline (15) is inserted into the biological segment (13) and connected to the fourth nozzle, and the fourth spray water recovery area is connected to the biological segment water supply pipeline (15) at the inlet section of the biological segment spray water pump (16) through the biological segment circulation pipeline.

9. The acrylic fiber wastewater and sludge drying waste gas treatment device according to claim 1, characterized in that: The air inlet end of the sewage and waste gas conveying pipeline (6) is provided with a section of glass fiber reinforced plastic air duct pipeline, and the air inlet end of the glass fiber reinforced plastic air duct pipeline is connected to a piece of white membrane cloth that can seal the top of the sludge sedimentation tank, and a detachable maintenance channel is left on the white membrane cloth.

Images