A dust filtration system and filtration method for bridge engineering construction

Abstract

The present invention discloses a dust filtration system and a filtration method for bridge engineering construction, including an air extraction device, an aeration dust removal device, and a wastewater sedimentation device. The wastewater sedimentation device includes a plurality of sedimentation units. The aeration dust removal device is connected with a drainage channel, and the drainage channel communicates with the plurality of sedimentation units. A buoyancy opening and closing mechanism is arranged in the sedimentation unit, which can close the drainage channel where the sedimentation unit is located and simultaneously open the water inlet of the adjacent sedimentation unit after the wastewater is filled in the sedimentation unit. A plurality of water outlets are further arranged on both sides of the sedimentation unit, and a floating ball normally closed switch is arranged at each water outlet for opening the water outlet when the liquid level drops. The water outlets on both sides of the sedimentation unit are arranged alternately in the vertical direction. The present invention solves the problem of slow wastewater filtration in the traditional sedimentation type, thereby improving the treatment efficiency of dust filtration.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal and purification in engineering construction. Specifically, it relates to a dust filtration system and a filtration method for bridge engineering construction. Background Art

[0002] During the process of bridge construction, in many specific construction processes, a large amount of dust will be generated. For example, local mountain blasting, bridge deck cutting, steel bar welding, etc. Currently, for the dust generated during construction, spray treatment is generally used to wet and settle the dust. However, this spray treatment method is generally only applicable to large-scale construction. For occasions with a high concentration and a large dust content, the dust removal effect is poor. For occasions with a high concentration and a large dust content, generally a suction fan is used to draw air and pass it into a water tank for water filtration. The water can remove the dust in the air, and the discharged air is relatively clean. However, since the filtered water is rich in dust, sedimentation treatment is required. The sedimented sludge is collected and treated, while the clear water is recycled. However, the sedimentation treatment speed is slow. During the process of bridge engineering construction, it is difficult to build a large sedimentation tank for sedimentation separation treatment. A small-volume sedimentation tank is difficult to meet the construction needs with a large dust volume. Summary of the Invention

[0003] Aiming at the problem of low sedimentation efficiency in dust filtration during the existing bridge construction process, the present invention provides a dust filtration system and a filtration method for bridge engineering construction, which can effectively improve the sedimentation efficiency and meet the application requirements in occasions with a large dust volume construction.

[0004] The present invention is achieved through the following technical solutions:

[0005] A dust filtration system for bridge engineering construction includes a suction device, an aeration dust removal device, and a waste water sedimentation device. The suction device is used to suck the dust generated during bridge engineering construction. The aeration dust removal device is connected to the suction device and can pass the air extracted by the suction device into the aeration dust removal device for aeration purification. The waste water sedimentation device is connected to the aeration dust removal device and is used to pass the dust-containing waste water into the waste water sedimentation device for sedimentation separation. The waste water sedimentation device has a clear water outlet and a sludge outlet. The clear water outlet is connected to the aeration dust removal device so that the sedimented clear water can be recycled;

[0006] The wastewater sedimentation device includes several sedimentation units. The aeration and dust removal device is connected to a drainage channel, and the drainage channel communicates with the several sedimentation units. A buoyancy opening and closing mechanism is arranged in the sedimentation unit, which can close the drainage channel where the sedimentation unit is located and simultaneously open the water inlet of the adjacent sedimentation unit after the wastewater is loaded into the sedimentation unit; several water outlets are also arranged on both sides of the sedimentation unit, and a floating ball normally closed switch is arranged at each water outlet for opening the water outlet when the liquid level drops; the water outlets on both sides of the sedimentation unit are arranged alternately in the vertical direction.

[0007] Optionally, the buoyancy opening and closing mechanism includes a buoyancy component, a first guiding component, a first gate plate, a second guiding component and a second gate plate. The buoyancy component is arranged in the sedimentation unit and is guided by the first guiding component; the first gate plate is connected to the buoyancy component through a first connecting rod, and the first gate plate is guided by the second guiding component. The buoyancy component can drive the first gate plate to move on the second guiding component through the first connecting rod, so as to open or close the drainage channel where the sedimentation unit is located; the second gate plate is used to close the water inlet of the sedimentation unit, and the first gate plate is also connected to the second gate plate of the adjacent sedimentation unit through a second connecting rod. When the first gate plate closes the drainage channel where the sedimentation unit is located, it can drive the second gate plate of the adjacent sedimentation unit to move through the second connecting rod, so as to open the water inlet of the adjacent sedimentation unit.

[0008] Optionally, the floating ball normally closed switch includes a ball cage structure arranged in the vertical direction. A floating ball is arranged in the ball cage structure, and a blocking ball is arranged in the water outlet. The floating ball and the blocking ball are connected by a connecting line; the highest floating position of the buoyancy component is lower than the floating position of the floating ball of the floating ball normally closed switch located at the uppermost position; in the vertical direction, the lowest floating position of the floating ball of the floating ball normally closed switch is lower than the highest floating position of the floating ball of the next floating ball normally closed switch.

[0009] Optionally, the water outlet at the lowest end is connected to a sludge pool, and the other water outlets are connected to the aeration and dust removal device.

[0010] Optionally, the bottom of the sedimentation unit adopts an inclined structure inclined towards the water outlet connected to the sludge pool, and the water inlet of the sedimentation unit is arranged on the opposite side of the water outlet connected to the sludge pool.

[0011] Optionally, the drainage channel further includes a main drainage pipeline and branch drainage pipelines. The main drainage pipeline communicates with all sedimentation units in sequence. One end of the branch drainage pipeline is connected to the main drainage pipeline, and the other end is provided with several connection parts, which are respectively connected to the main drainage pipeline at a certain distance through the connection parts, and electromagnetic valves are arranged on each connection part.

[0012] Optionally, a clear water temporary storage device is also provided between the wastewater precipitation device and the aeration dust removal device.

[0013] Optionally, the aeration dust removal device is also connected to a clear water supply device.

[0014] A filtering method based on the dust filtering system for bridge engineering construction described above includes the following steps:

[0015] Extract dust through an exhaust device, and then introduce it into the aeration dust removal device. Rely on the water in the aeration dust removal device to purify and filter the dust. The wastewater generated in the aeration dust removal device is introduced into the wastewater precipitation device for separation. The separated clear water is then returned to the aeration dust removal device for use, and the sludge is centrally treated;

[0016] Among them, the separation of the wastewater precipitation device relies on the drainage channel to enter the precipitation unit at the end of the drainage channel. After it is filled, the corresponding drainage channel is closed by the buoyancy opening and closing mechanism, and at the same time, the water inlet of an adjacent precipitation unit is opened to allow water to enter the next precipitation unit, and so on, to complete the water inlet of each precipitation unit in turn; after each precipitation unit is filled with water, precipitation begins. The normally closed float switch at the top first opens to release clear water, which is collected and then returned to the aeration dust removal device for use. When the water surface drops to the position of the next normally closed float switch, this float switch is activated to continue releasing clear water, and so on, from top to bottom, to release the clear water separated by precipitation.

[0017] The technical solution of the present invention has at least the following beneficial effects:

[0018] In the dust filtering system for bridge engineering construction of the present invention, by dividing the wastewater precipitation device into several precipitation units, separate precipitation can be achieved without mutual influence. Compared with the traditional technology that requires a large-volume sedimentation tank for long-time precipitation, which leads to a large floor area and slow sedimentation separation and inability to replenish water in time, the water inlet of each precipitation unit is isolated by the buoyancy opening and closing mechanism, and the normally closed float switches arranged alternately are relied on to drain water during the precipitation process, ensuring that clear water separation can be achieved during the precipitation process, and the dust filtering water can be replenished in time, improving the dust filtering effect.

[0019] In the dust filtering method for bridge engineering construction of the present invention, dust filtering is achieved by relying on the aeration dust removal device, and then timely precipitation separation is achieved by continuously introducing it into the wastewater precipitation device. The clear water separated by precipitation can be timely replenished to the aeration dust removal device, effectively saving water consumption. Description of the Drawings

[0020] Figure 1 It is a structural schematic diagram of the dust filtering system for bridge engineering construction of the present invention;

[0021] Figure 2 It is a top - view structural schematic diagram of the wastewater sedimentation device of the present invention;

[0022] Figure 3 It is a diagram of the water inlet state of the terminal sedimentation unit of the wastewater sedimentation device of the present invention;

[0023] Figure 4 It is a diagram of the water inlet state of the second sedimentation unit from the end of the wastewater sedimentation device of the present invention;

[0024] Figure 5 It is a side - view structural schematic diagram of the wastewater sedimentation device of the present invention;

[0025] Figure 6 is Figure 5 an enlarged view of part a.

[0026] Icon: 100 - exhaust device, 200 - aeration dust removal device, 300 - wastewater sedimentation device, 400 - clean water temporary storage device, 500 - clean water supply device, 310 - sedimentation unit, 320 - buoyancy opening - closing mechanism, 321 - buoyancy component, 322 - first connecting rod, 323 - first sluice gate, 324 - second connecting rod, 325 - second sluice gate, 326 - first guiding component, 327 - second guiding component, 331 - main drainage pipeline, 332 - branch drainage pipeline, 340 - normally - closed float switch, 341 - drainage port, 342 - plugging ball, 343 - ball cage structure, 344 - float ball. Detailed implementation manners

[0027] Refer to Figure 1, the dust filtration system for bridge engineering construction of the present invention includes an air extraction device 100, an aeration dust removal device 200, and a wastewater sedimentation device 300. By integrating the air extraction device 100, the aeration dust removal device 200, and the wastewater sedimentation device 300 onto a movable body, it can be moved to the occasion where dust filtration is required according to the changes in the construction site. Of course, it can also be integrated into a fixed location for use in occasions where a large amount of dust is generated at a fixed position during the entire construction process. Those skilled in the art can choose the layout method according to the actual on-site needs. Among them, the air extraction device 100 mainly adopts the design of integrating an air extraction fan with an air extraction pipeline, which is used to suck the dust generated during the bridge engineering construction. The aeration dust removal device 200 adopts a tank structure with an aeration disk integrated at the bottom. The dust extracted by the air extraction device 100 is introduced into the aeration disk of the aeration dust removal device 200 through a pipeline. The tank structure is filled with purified water. After the dust is aerated, it can be repeatedly mixed with water and finally remain in the water. During the construction process of bridge engineering, most of the dust can be purified by water. Therefore, the dust can be filtered and purified through the aeration dust removal device 200. The wastewater sedimentation device 300 is connected to the aeration dust removal device 200 and is used to introduce the dust-absorbing wastewater into the wastewater sedimentation device 300 for sedimentation and separation. The wastewater sedimentation device 300 has a clear water outlet and a sludge outlet. The clear water outlet is connected to the aeration dust removal device 200 so that the sedimented clear water can be recycled.

[0028] Refer to Figures 2 - 4, the wastewater sedimentation device 300 includes a number of sedimentation units 310. Each sedimentation unit 310 adopts a rectangular box structure. For example, a box with a length of 100 cm, a width of 100 cm, and a thickness of 20 cm is used. After the sedimentation units 310 are arranged side by side in the thickness direction, a rectangular structure with a certain length can be formed. For example, if 20 sedimentation units 310 are arranged side by side, a rectangular structure with a length of 100 cm, a width of 100 cm, and a thickness of 400 cm is formed. The aeration and dust removal device 200 is provided with a drainage channel, which communicates with a number of sedimentation units 310. In this embodiment, the drainage channel is directly arranged above one side of the rectangular structure formed by arranging 20 sedimentation units 310. Each sedimentation unit 310 is provided with a water inlet, and is connected to the drainage channel through the water inlet, so that wastewater can be discharged into each sedimentation unit 310 through the drainage channel. A buoyancy opening and closing mechanism 320 is provided in the sedimentation unit 310, which can close the drainage channel where the sedimentation unit 310 is located and open the water inlet of the adjacent sedimentation unit 310 after a certain amount of wastewater is loaded into the sedimentation unit 310. In this embodiment, the wastewater in the aeration and dust removal device 200 is introduced into the drainage channel through one end of the drainage channel, and then flows into the last sedimentation unit 310. After wastewater is introduced into the sedimentation unit 310 and waits for it to be filled with the specified amount, the buoyancy opening and closing mechanism 320 can be started, so as to close the drainage channel connecting the water inlet in this sedimentation unit 310 and open the next sedimentation unit 310 at the same time, and continue to introduce wastewater.

[0029] Referring to Figures 3 - 5 , specifically, the buoyancy opening and closing mechanism 320 includes a buoyancy component 321, a first guiding component 326, a first gate plate 323, a second guiding component 327 and a second gate plate 325. The buoyancy component 321 is arranged in the sedimentation unit 310 and is guided by the first guiding component 326. The buoyancy component 321 is made of a material with buoyancy, and the first guiding component 326 can use a guiding rod or a guiding track, etc., as long as it can keep the buoyancy component 321 moving in the vertical direction. The first gate plate 323 is connected to the buoyancy component 321 through a first connecting rod 322, and the first gate plate 323 is guided by the second guiding component 327. The buoyancy component 321 can drive the first gate plate 323 to move on the second guiding component 327 through the first connecting rod 322, so as to open or close the drainage channel where the sedimentation unit 310 is located. The second guiding component 327 also adopts the arrangement mode of a guiding rod or a guiding track, and is arranged according to the height of the drainage channel in the direction. Moreover, in this embodiment, the second guiding component 327 is arranged horizontally, and can switch between the position where the first gate plate 323 is inserted into the drainage channel to intercept the sedimentation unit 310 where it is located and the position where it retracts into the sedimentation unit 310 to load wastewater.

[0030] The second shutter 325 is used to close the water inlet of the sedimentation unit 310. The first shutter 323 is also connected to the second shutter 325 of the adjacent sedimentation unit 310 through the second connecting rod 324. When the first shutter 323 closes the drainage channel where the sedimentation unit 310 is located, it can drive the second shutter 325 of the adjacent sedimentation unit 310 to move through the second connecting rod 324, thereby opening the water inlet of the adjacent sedimentation unit 310.

[0031] In this embodiment, in order to achieve sequential water inlet from beginning to end, first, the second shutter 325 is not provided at the water inlet position of the last sedimentation unit 310. After the drainage channel is opened, water preferentially enters the last sedimentation unit 310, and the water inlets of other sedimentation units 310 are in a closed state. When the wastewater loaded in the last sedimentation unit 310 can float the buoyancy component 321, the first connecting rod 322 between the buoyancy component 321 and the first shutter 323 drives the first shutter 323 to move along the second guiding component 327, so that the first shutter 323 blocks the drainage channel. At this time, the drainage channel stops supplying water to the last sedimentation unit 310. While the first shutter 323 is moving, it also drives the second shutter 325 of an adjacent sedimentation unit 310 (or the second sedimentation unit 310) to move through the second connecting rod 324. The second shutter 325 is located at the drainage port 341 and is arranged perpendicular to the first shutter 323. The movement of the second shutter 325 can open the water inlet of the sedimentation unit 310 where it is located. When the first shutter 323 of the last first sedimentation unit 310 is closed, the second shutter 325 of the second sedimentation unit 310 just opens. Therefore, the first sedimentation unit 310 stops water inlet, and the second sedimentation unit 310 starts water inlet. According to this principle, sequential water inlet of individual sedimentation units 310 is realized from the end of the drainage channel, and there is no mutual interference, so that when each sedimentation unit 310 can sediment, other sedimentation units 310 can inlet water without affecting it.

[0032] When some of the sedimentation units 310 have completed sedimentation and drainage, but other sedimentation units 310 have not completed sedimentation and drainage or may still be taking in water, in order to improve the utilization rate of the sedimentation units 310, the drainage channel also includes a drainage main pipe 331 and a drainage branch pipe 332. The drainage main pipe 331 is connected to all the sedimentation units 310 in sequence. One end of the drainage branch pipe 332 is connected to the drainage main pipe 331, and the other end is provided with a plurality of connecting parts, which are respectively connected to the drainage main pipe 331 at a certain distance through the connecting parts, and each connecting part is provided with a solenoid valve. At this time, the drainage branch pipes 332 corresponding to the several sedimentation units 310 that have completed sedimentation and drainage can be opened, and drainage can be carried out from the drainage branch pipes 332, so as to continue to start these sedimentation units 310, so that these sedimentation units 310 can continue to achieve sedimentation and drainage. The opening and closing of the drainage branch pipe 332 can be controlled by the solenoid valve program to open at a time, or a manual valve can be used to open manually.

[0033] Reference Figure 5 , Figure 6 , a plurality of water outlets are also arranged on both sides of the sedimentation unit 310, and a float normally closed switch 340 is arranged at each water outlet, which is used to open the water outlet when the liquid level drops. The water outlets on both sides of the sedimentation unit 310 are arranged alternately in the vertical direction. Specifically, the float normally closed switch 340 includes a ball cage structure 343 arranged in the vertical direction, a float is arranged in the ball cage structure 343, a blocking ball 342 is arranged in the water outlet, and the float and the blocking ball 342 are connected by a connecting line; the highest floating position of the buoyancy component 321 is vertically lower than the floating position of the float of the float normally closed switch 340 located at the top; in the vertical direction, the lowest floating position of the float of the float normally closed switch 340 is lower than the highest floating position of the float of the next float normally closed switch 340. When the first gate 323 closes the drainage channel, the buoyancy component 321 also stops floating and is in a short-term stay state. The stay position of the buoyancy component 321 is lower than the floating position of the topmost float normally closed switch 340, that is, the topmost float normally closed switch 340 is not normally closed at this time, so the drainage starts at this time, and the sedimentation of wastewater starts from now on. At the same time, the drainage of the topmost water outlet also starts. The water outlet can be designed with a valve to adjust the size of the drainage volume. The drainage volume can generally be set according to the approximate sedimentation speed. When the water level line is lower than the topmost water outlet, the float in the float normally closed switch 340 at the next height has fallen to the bottom of the ball cage structure 343, releasing the closure of the second water outlet, and the second water outlet has begun to discharge water. By analogy, the drainage can be completed step by step to achieve the removal of clean water after sedimentation.

[0034] The water outlet at the lowest end is connected to the sludge tank, and the other water outlets are connected to the aeration dust removal device 200, so that the highly muddy sewage finally discharged can be collected and treated uniformly. At the same time, the bottom of the precipitation unit 310 adopts an inclined structure that slopes towards the water outlet connected to the sludge tank, and the water inlet of the precipitation unit 310 is arranged on the opposite side of the water outlet connected to the sludge tank. After the precipitation unit 310 completes precipitation separation and drainage, the newly incoming sewage can fall from the water inlet and scour the inclined bottom structure well. Moreover, at the beginning, the normally closed float switch 340 of this water outlet is still in the open state because there is no buoyancy. Therefore, the newly incoming wastewater can scour the bottom of the precipitation unit 310 well. Cooperating with the inclined surface structure, the sludge after the previous precipitation can be quickly scoured. When the water level reaches a certain height, the normally closed float switch 340 closes and starts to store water.

[0035] A clear water temporary storage device 400 is still provided between the wastewater precipitation device 300 and the aeration dust removal device 200. Since the water flow at the water outlet is of small flow rate, it can be well collected and temporarily stored through the clear water temporary storage device 400. The aeration dust removal device 200 is also connected to a clear water supply device 500 for supplementing clear water to keep the aeration dust removal device 200 running normally.

[0036] This embodiment also provides a filtering method based on the previous dust filtering system for bridge engineering construction, including the following steps:

[0037] The dust is extracted by the exhaust device 100 and then introduced into the aeration dust removal device 200. The water in the aeration dust removal device 200 is used to purify and filter the dust. The wastewater generated in the aeration dust removal device 200 is introduced into the wastewater precipitation device 300 for separation. The separated clear water is then returned to the aeration dust removal device 200 for use, and the sludge is centrally treated;

[0038] Among them, the separation of the wastewater precipitation device 300 relies on the drainage channel to enter the precipitation unit 310 at the end of the drainage channel. After it is filled, the corresponding drainage channel is closed by the buoyancy opening and closing mechanism 320, and at the same time, the water inlet of an adjacent precipitation unit 310 is opened to allow water to enter the next precipitation unit 310, and so on, to complete the water inlet of each precipitation unit 310 in turn; after each precipitation unit 310 is filled with water, precipitation begins. The normally closed float switch 340 at the top first opens to release clear water, which is collected and then returned to the aeration dust removal device 200 for use. When the water surface drops to the position of the next normally closed float switch 340, this normally closed float switch 340 is activated to continue releasing clear water, and so on, from top to bottom, to release the clear water after precipitation separation.

[0039] When some of the precipitation units 310 have completed precipitation drainage, but other precipitation units 310 have not completed precipitation drainage or may still be receiving influent, open the drainage branch pipes 332 corresponding to several precipitation units 310 that have completed precipitation drainage, and drain water from the drainage branch pipes 332, so as to continue to start these several precipitation units 310 and enable these several precipitation units 310 to continue to achieve precipitation drainage.

Claims

1. A dust filtration system for bridge engineering construction, comprising an air extraction device, an aeration dust removal device, and a wastewater sedimentation device. The air extraction device is used to suck the dust generated during the bridge engineering construction. The aeration dust removal device is connected to the air extraction device and can introduce the air extracted by the air extraction device into the aeration dust removal device for aeration purification. The wastewater sedimentation device is connected to the aeration dust removal device and is used to introduce the dust-removing wastewater into the wastewater sedimentation device for sedimentation separation. The wastewater sedimentation device has a clear water outlet and a sludge outlet. The clear water outlet is connected to the aeration dust removal device so that the clarified water after sedimentation can be recycled. It is characterized in that: The wastewater sedimentation device includes a plurality of sedimentation units. The aeration dust removal device is connected with a drainage channel, and the drainage channel communicates with the plurality of sedimentation units. A buoyancy opening and closing mechanism is arranged in the sedimentation unit, which can close the drainage channel where the sedimentation unit is located and simultaneously open the water inlet of the adjacent sedimentation unit after the wastewater is filled in the sedimentation unit. A plurality of water outlets are also arranged on both sides of the sedimentation unit, and a floating ball normally closed switch is arranged at each water outlet for opening the water outlet when the liquid level drops. The water outlets on both sides of the sedimentation unit are arranged alternately in the vertical direction. The buoyancy opening and closing mechanism includes a buoyancy component, a first guiding component, a first sluice gate, a second guiding component, and a second sluice gate. The buoyancy component is arranged in the sedimentation unit and is guided by the first guiding component. The first sluice gate is connected to the buoyancy component through a first connecting rod, and the first sluice gate is guided by the second guiding component. The buoyancy component can drive the first sluice gate to move on the second guiding component through the first connecting rod, so as to open or close the drainage channel where the sedimentation unit is located. The second sluice gate is used to close the water inlet of the sedimentation unit. The first sluice gate is also connected to the second sluice gate of the adjacent sedimentation unit through a second connecting rod. When the first sluice gate closes the drainage channel where the sedimentation unit is located, it can drive the second sluice gate of the adjacent sedimentation unit to move through the second connecting rod, so as to open the water inlet of the adjacent sedimentation unit.

2. The dust filtration system for bridge engineering construction according to claim 1, characterized in that, The floating ball normally closed switch includes a ball cage structure arranged in the vertical direction. A floating ball is arranged in the ball cage structure, and a plugging ball is arranged in the water outlet. The floating ball and the plugging ball are connected by a connecting line. The highest floating position of the buoyancy component is lower than the floating position of the floating ball of the floating ball normally closed switch located at the uppermost position. Vertically, the lowest floating position of the floating ball of the floating ball normally closed switch is lower than the highest floating position of the floating ball of the next floating ball normally closed switch.

3. The dust filtration system for bridge engineering construction according to claim 1, characterized in that, The water outlet at the lowest end is connected to the sludge pool, and the other water outlets are connected to the aeration dust removal device.

4. The dust filtration system for bridge engineering construction according to claim 3, characterized in that, The bottom of the sedimentation unit adopts an inclined structure inclined towards the water outlet connected to the sludge pool, and the water inlet of the sedimentation unit is arranged on the opposite side of the water outlet connected to the sludge pool.

5. The dust filtration system for bridge engineering construction according to any one of claims 1-4, characterized in that, The drainage channel further includes a main drainage pipe and branch drainage pipes. The main drainage pipe is sequentially connected to all sedimentation units. One end of each branch drainage pipe is connected to the main drainage pipe, and the other end is provided with a plurality of connection parts which are respectively connected to the main drainage pipe at a certain distance interval, and a solenoid valve is arranged on each connection part.

6. The dust filtration system for bridge engineering construction according to claim 5, wherein A clear water temporary storage device is also arranged between the wastewater sedimentation device and the aeration dust removal device.

7. The dust filtration system for bridge engineering construction according to claim 6, wherein, The aeration dust removal device is further connected with a clear water supply device.

8. A filtering method for a dust filtering system used in bridge engineering construction according to any one of claims 1-2, characterized in that, It includes the following steps: Dust is extracted by an air extraction device and then introduced into the aeration dust removal device. The water in the aeration dust removal device is used to purify and filter the dust. The wastewater generated in the aeration dust removal device is introduced into the wastewater sedimentation device for separation. The separated clear water is then returned to the aeration dust removal device for use, and the sludge is centrally treated. Among them, the separation of the wastewater sedimentation device depends on the drainage channel to enter the sedimentation unit at the end of the drainage channel. After it is filled, the corresponding drainage channel is closed by the buoyancy opening and closing mechanism, and at the same time, the water inlet of an adjacent sedimentation unit is opened to allow water to enter the next sedimentation unit, and so on, to complete the water inlet of each sedimentation unit in sequence; after each sedimentation unit is filled with water, sedimentation starts. The normally closed float switch at the top is first opened to discharge clear water, which is collected and then returned to the aeration dust removal device for use. When the water surface drops to the position of the next normally closed float switch, this float switch is activated to continue discharging clear water, and so on, discharging the clear water separated by sedimentation from top to bottom.

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