A multi-stage separation wastewater treatment device for construction projects

Abstract

This invention relates to the field of wastewater treatment technology, specifically to a multi-stage separation wastewater treatment device for construction engineering. The device includes a wastewater tank and a treatment mechanism. The treatment mechanism comprises a filter section, an inner pipe, an outer pipe, retrieval rods, a conveying shaft, spiral conveying blades, a support section, an air supply section, motor a, and motor b. The support section is connected to the wastewater tank. The inner pipe is connected to the support section. One end of the inner pipe is detachably connected to a discharge pipe. The conveying shaft is rotatably connected inside the inner pipe. The spiral conveying blades are connected to the conveying shaft. Motor a is mounted on the support section and driven by the conveying shaft. The outer pipe is rotatably located outside the inner pipe. Multiple rows of retrieval rods are arranged circumferentially on the outer pipe. The air supply section is connected to one end of the retrieval rods and to the filter section. Motor b is mounted on the support section and driven by the outer pipe. This invention simultaneously achieves multi-stage wastewater treatment, significantly improving wastewater treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage separation type wastewater treatment device for building engineering. Background Technology

[0002] Construction wastewater is complex, including high-concentration mud water as well as domestic sewage containing oil and organic matter. Therefore, in actual projects, a mature "multi-stage treatment" system is usually a combination of physical separation, physicochemical treatment and biochemical treatment, with different process lines adopted for different types of wastewater.

[0003] Chinese patent CN113499616B discloses a construction wastewater treatment device. Through the installation of a float, when construction wastewater is filled to a certain level, the float touches a fixed switch at the top. The fixed switch activates a drive motor, which drives the treatment cylinder to rotate. As the treatment cylinder rotates from top to bottom, the wastewater flows out from the outlet and into a collection frame. When the filtered wastewater has completely flowed out, the float slides down due to gravity and presses against the fixed switch. The drive motor then rotates the treatment cylinder back to its initial position, causing the outlet to rotate to the top of the treatment cylinder, allowing for further filtration of the added wastewater. This extends the reaction time between the wastewater and activated carbon particles, ensuring thorough filtration of the construction wastewater.

[0004] However, the existing technologies have the following drawbacks: large-volume garbage generally floats in construction wastewater. The existing technologies simultaneously dredge and process the floating large-volume garbage, which is not strong enough for wastewater treatment. In addition, relying solely on activated carbon to filter impurities in wastewater requires a long reaction time, which reduces wastewater treatment efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a multi-stage separation wastewater treatment device for building engineering.

[0006] The technical solution of the present invention: A multi-stage separation wastewater treatment device for construction engineering, comprising a wastewater tank, and further comprising: The processing mechanism includes a filter section, an inner tube, an outer tube, a retrieval rod, a conveying shaft, a spiral conveying blade, a support section, an air conveying section, motor a, and motor b. The support section is connected to the wastewater tank. The inner tube is connected to the support section. One end of the inner tube is detachably connected to a discharge pipe. The conveying shaft is rotatably connected inside the inner tube. The spiral conveying blade is connected to the conveying shaft. Motor a is mounted on the support section and is driven by the conveying shaft. The outer tube is rotatably mounted on the outside of the inner tube. The retrieval rod has multiple rows distributed circumferentially on the outer tube. The air conveying section is connected to one end of the retrieval rod and is connected to the filter section. Motor b is mounted on the support section and is driven by the outer tube. The filter section includes a spherical shell, an air bladder, fiber bundles, and a connecting tube; one end of the connecting tube is connected to the air supply section; the other end of the connecting tube is connected to the air bladder; the fiber bundles are densely distributed on the surface of the air bladder; activated carbon particles are provided on the surface of the fiber bundles; the spherical shell is fitted over the outside of the air bladder and has holes for the fiber bundles to pass through. An aeration device, located at the bottom of a wastewater tank, is used to aerate the wastewater.

[0007] Preferably, the aeration mechanism includes a hollow plate, aeration valves, a blower, a pipe body, and a sealing frame; the sealing frame is connected to the inner wall of the wastewater tank; the hollow plate is slidably disposed in the wastewater tank and is in close contact with the sealing frame; multiple aeration valves are provided and evenly distributed on the hollow plate; the blower is disposed at the bottom of the wastewater tank and is connected to the hollow plate through the pipe body.

[0008] Preferably, the support includes a guide rail, a sliding plate, and an L-shaped plate; the guide rail is connected to the side wall of the wastewater tank; the sliding plate is slidably connected to the guide rail; the L-shaped plate is connected to the sliding plate; the motor a is connected to the L-shaped plate; and one end of the L-shaped plate is connected to the inner tube.

[0009] Preferably, the output end of motor a and one end of the conveying shaft are both connected to synchronous pulleys; a synchronous toothed belt is connected between the two synchronous pulleys.

[0010] Preferably, gear a is connected to the outer tube; gear b is connected to the output end of motor b; gear b meshes with gear a.

[0011] Preferably, the outer tube has multiple circumferentially distributed openings a; the inner tube has an opening b at its top end.

[0012] Preferably, the air delivery unit includes a hollow pipe, a housing, an air pump, and a main pipe; the hollow pipe is connected to the retrieval rod; the housing is connected to one end of the hollow pipe; the main pipe is connected inside the hollow pipe; a connecting pipe is connected to the main pipe; and the air pump is located inside the housing and connected to the main pipe.

[0013] Preferably, a support plate is connected to the hollow plate; the top of the support plate is rotatably connected to the outer tube.

[0014] Preferably, a telescopic component is connected to the side wall of the wastewater tank; the telescopic component is connected to the sliding plate.

[0015] Preferably, a drain pipe is connected to the side wall of the wastewater tank; a valve is installed on the drain pipe.

[0016] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: By incorporating a treatment mechanism, the clustered fiber bundles in the filtration section actively capture residual fine silt, colloidal flocs, and tiny suspended impurities in the wastewater, which are then entangled and physically restrained by the fiber bundles. Simultaneously, activated carbon particles loaded on the fiber bundles adsorb trace amounts of COD, pigments, small amounts of oil, and heavy metal ions in the water, removing dissolved small molecule pollutants. This achieves the function of filtering out fine impurities in the wastewater. Furthermore, the retrieval rod can simultaneously retrieve garbage from the wastewater, thereby achieving multi-stage wastewater treatment and significantly improving wastewater treatment efficiency.

[0017] Equipped with telescopic components, support plates, and an aeration mechanism, the aeration mechanism can cause the wastewater to surge, keeping impurities in the wastewater in a suspended state at all times, making it easier for the filtration section to actively capture the impurities. After the impurities settle, the telescopic components drive the hollow plate to move upward, making it easy for staff to recover the settled impurities. Attached Figure Description

[0018] Figure 1 A three-dimensional representation of an embodiment of the present invention Figure 1 ; Figure 2 A three-dimensional representation of an embodiment of the present invention Figure 2 ; Figure 3 A three-dimensional representation of an embodiment of the present invention Figure 3 ; Figure 4 A three-dimensional representation of an embodiment of the present invention Figure 4 ; Figure 5 This is a perspective view of the cross-sectional state of a wastewater tank in one embodiment of the present invention; Figure 6 This is a schematic diagram of the inner and outer tubes in one embodiment of the present invention; Figure 7 This is a schematic diagram of the connection structure between the box and the hollow tube and the filter section in a cross-sectional state according to an embodiment of the present invention. Figure 8 This is a schematic diagram of the filter section in the cross-sectional state of the spherical shell in one embodiment of the present invention.

[0019] Reference numerals: 1. Wastewater tank; 101. Drainage pipe; 2. Telescopic component; 3. Motor a; 4. Slide plate; 5. Guide rail; 6. Inner pipe; 601. Opening b; 7. Outer pipe; 701. Opening a; 8. Fiber bundle; 9. Spherical shell; 10. Support plate; 11. Gear a; 12. Motor b; 13. Discharge pipe; 14. Retrieval rod; 15. Hollow pipe; 16. Box body; 17. Spiral conveyor blade; 18. L-shaped plate; 19. Fan; 20. Hollow plate; 21. Aeration valve; 22. Gear b; 23. Sealing frame; 24. Pipe body; 25. Connecting pipe; 26. Air pump; 27. Airbag. Detailed Implementation

[0020] Example 1, as Figures 1-8 As shown, the present invention proposes a multi-stage separation type wastewater treatment device for construction engineering, including a wastewater tank 1, a drain pipe 101 connected to the side wall of the wastewater tank 1, a valve provided on the drain pipe 101, and a treatment mechanism and an aeration mechanism. The processing mechanism includes a filter section, an inner pipe 6, an outer pipe 7, a retrieval rod 14, a conveying shaft, a spiral conveying blade 17, a support section, an air conveying section, a motor a3, and a motor b12. The support section is connected to the wastewater tank 1. The support section includes a guide rail 5, a sliding plate 4, and an L-shaped plate 18. The guide rail 5 is connected to the side wall of the wastewater tank 1. The sliding plate 4 is slidably connected to the guide rail 5. The L-shaped plate 18 is connected to the sliding plate 4. The motor a3 is connected to the L-shaped plate 18. One end of the L-shaped plate 18 is connected to the inner pipe 6. The inner pipe 6 is connected to the support section. One end of the inner pipe 6 is detachably connected to a discharge pipe 13 (the detachable connection method includes, but is not limited to, connection by screws; when the discharge pipe 13 is blocked, it can be disassembled for unblocking). The conveying shaft is rotatably connected inside the inner pipe 6. The spiral conveying blade 17 is connected to the conveying shaft. The motor a3 is mounted on the support section and connected to the conveying shaft. The shaft drive connection includes a synchronous pulley at the output end of motor a3 and one end of the conveying shaft; a synchronous toothed belt connects the synchronous pulleys on both sides; the outer tube 7 is rotatably located outside the inner tube 6; multiple circumferentially distributed openings a701 are opened on the outer tube 7; an opening b601 is opened at the top of the inner tube 6; multiple rows of retrieval rods 14 are arranged circumferentially on the outer tube 7 (each row of retrieval rods 14 resembles a comb and can retrieve large floating garbage); the air supply unit is connected to one end of the retrieval rod 14 and is connected to the filter unit; motor b12 is located on the support unit and is driven by the outer tube 7; gear a11 is connected to the tube; gear b22 is connected to the output end of motor b12; gear b22 meshes with gear a11 (the diameter of gear b22 is smaller than the diameter of gear a11, allowing gear b22 to drive gear a11 to rotate slowly). The filtration section includes a spherical shell 9, an air bladder 27, fiber bundles 8, and a connecting pipe 25; one end of the connecting pipe 25 is connected to the air supply section; the other end of the connecting pipe 25 is connected to the air bladder 27; the fiber bundles 8 are densely distributed on the surface of the air bladder 27 (the fiber bundles 8 are Kevlar fiber bundles, which have the characteristics of high strength, resistance to repeated bending, impact resistance, and wear resistance. They can deform slightly and buffer under stress, and can recover their shape after the external force is removed); the spherical shell 9 is fitted on the outside of the air bladder 27 and has holes for the fiber bundles 8 to pass through (the fiber bundles 8 form clusters of fiber tufts on the outside of the spherical shell 9); the surface of the fiber bundles 8 is covered with activated carbon particles; the fiber bundles 8 between adjacent filtration sections interweave to form a denser cluster structure, which is used to improve the filtration effect of impurities in wastewater; The aeration unit is located at the bottom of wastewater tank 1 and is used to aerate the wastewater.

[0021] It should be noted that the activated carbon particles are mainly applied to the surface of the fiber bundle 8 through an impregnation coating bonding method. The main steps are as follows: first, mix the water-based binder and a small amount of water into a uniform slurry; then, completely immerse the entire fiber bundle 8 in the slurry and allow it to fully wet, so that the adhesive adheres to the surface of each fiber bundle 8; remove the fiber bundle 8, gently squeeze out the excess slurry, and then sprinkle activated carbon powder on the surface of the fiber bundle 8; then, dry it with hot air at 40-60℃. After the slurry has solidified, the activated carbon particles are firmly fixed to the surface of the fiber bundle 8.

[0022] When it is necessary to peel off the activated carbon particles, the fiber bundle 8 is soaked in a dilute sodium hydroxide solution (at room temperature and with a concentration of 5% to 8%). The glue will swell and become ineffective when it comes into contact with a weak alkali, causing the activated carbon layer to fall off in one piece.

[0023] In this embodiment, the wastewater to be treated is poured into the wastewater tank 1. Motor b12 drives gear b22 to rotate intermittently, which in turn drives gear a11 to rotate slowly and intermittently. Gear a11 then drives the outer tube 7 to rotate slowly and intermittently. The outer tube 7 drives the retrieval pipe and the filter section in intermittent circular motion. As the filter section moves through the wastewater, the wastewater passes through the clustered fiber clumps on the surface of the spherical shell 9. Fine silt, colloidal flocs, and tiny suspended impurities remaining in the wastewater are entangled and physically trapped by the fiber bundles 8. The activated carbon particles loaded on the fiber bundles 8 simultaneously adsorb trace amounts of COD, pigments, small amounts of oil, and heavy metals in the water. The system removes dissolved small molecule pollutants and filters out fine impurities from wastewater. When the retrieval rod 14 moves out from inside the wastewater, it can retrieve large-volume garbage floating on the surface. When the retrieval rod 14 rotates to near the opening b601, it tilts and the large-volume garbage slides down the retrieval rod 14 under its own gravity and enters the inner tube 6 through the openings a701 and b601. This achieves the automatic retrieval function of floating garbage in wastewater, and simultaneously realizes the multi-stage treatment function of wastewater (i.e., garbage retrieval, filtration of fine impurities in wastewater, and adsorption and removal of harmful substances in wastewater).

[0024] When the filter section rotates to directly above the opening b601, the motor b12 stops working. At this time, the outer tube 7 stops rotating, and the air supply section extracts the gas inside the air bag 27, causing the air bag 27 to deflate. After deflation, the air bag 27 will deflate and cause the fiber bundle 8 to retract into the spherical shell 9 (not completely retracted into the spherical shell 9, the ends of the fiber bundle 8 are located on the outside of the spherical shell 9). At this time, the cluster of fibers formed by the fiber bundle 8 will disintegrate, and the bound impurities will automatically fall off and fall into the inner tube 6 through the openings a701 and b601, realizing the self-cleaning function of impurities and ensuring that the filter section has the maximum filtration efficiency each time it enters the wastewater.

[0025] By turning on motor a3, motor a3, together with synchronous pulley and synchronous toothed belt, drives the conveyor shaft to rotate. The conveyor shaft drives the spiral conveyor blade 17 to rotate. The spiral conveyor blade 17 realizes the function of conveying garbage and impurities, and finally discharges them through discharge pipe 13 for easy recycling by staff.

[0026] Example 2, as Figures 3-5 As shown, this invention proposes a multi-stage separation wastewater treatment device for construction engineering. Compared with Embodiment 1, this embodiment further details the structure of the aeration mechanism, which includes a hollow plate 20, an aeration valve 21, a blower 19 (including but not limited to a Roots blower), a pipe body 24, and a sealing frame 23. The sealing frame 23 is connected to the inner wall of the wastewater tank 1. The hollow plate 20 is slidably disposed in the wastewater tank 1 and is in close contact with the sealing frame 23 (the surface of the sealing frame 23 is provided with a rubber layer to ensure the sealing between it and the hollow plate 20). Multiple aeration valves 21 are evenly distributed on the hollow plate 20; the blower 19 is located at the bottom of the wastewater tank 1 and is connected to the hollow plate 20 through a pipe 24 (the pipe 24 is a telescopic flexible hose); a support plate 10 is connected to the hollow plate 20; the top of the support plate 10 is rotatably connected to the outer pipe 7; a telescopic component 2 (including but not limited to cylinders and other devices) is connected to the side wall of the wastewater tank 1; the telescopic component 2 is connected to the slide plate 4; a drain pipe 101 is connected to the side wall of the wastewater tank 1; a valve is provided on the drain pipe 101.

[0027] In this embodiment, the blower 19 delivers air to the hollow plate 20 through the pipe 24, and finally sprays it out through the aeration valve 21, which can realize the function of aeration in the wastewater. The aeration causes the wastewater to surge, so that the impurities in the wastewater are always in a suspended state, which makes it easier for the filtration section to actively capture the impurities.

[0028] It should be noted that after the filtration unit completes the wastewater filtration function, there may be a small amount of free impurities in the wastewater. At this time, flocculant can be added to the wastewater to make the remaining impurities gather and settle. After the settling is completed, the valve on the drain pipe 101 is opened to discharge the purified wastewater to the next treatment process. After the wastewater is discharged, the telescopic component 2 is used to drive the slide plate 4 to move upward. The slide plate 4 drives the L-shaped plate 18 to move upward. The L-shaped plate 18 drives the inner pipe 6 to move upward. The inner pipe 6 drives the outer pipe 7 to move upward. The outer pipe 7 drives the hollow plate 20 to move upward through the support plate 10, so that the hollow plate 20 moves upward to near the top of the wastewater pool 1, which is convenient for the staff to clean the settled impurities.

[0029] Example 3, as Figure 7 As shown, the present invention proposes a multi-stage separation wastewater treatment device for building engineering. Compared with Embodiment 2, this embodiment further includes an air conveying section, which includes a hollow pipe 15, a box 16, an air pump 26, and a main pipe. The hollow pipe 15 is connected to the retrieval rod 14. The box 16 is connected to one end of the hollow pipe 15. The main pipe is connected inside the hollow pipe 15. The connecting pipe 25 is connected to the main pipe. The air pump 26 is located inside the box 16 and is connected to the main pipe (the air pump 26 is a micro air pump 26, which is a pump for both suction and air filling).

[0030] In this embodiment, the air pump 26 is used to deliver the air in the box 16 to the main pipe, and then from the main pipe to the connecting pipe 25, and finally into the airbag 27, causing the airbag 27 to inflate; by extracting the air from the airbag 27 and releasing it into the box 16, the function of deflation of the airbag 27 can be achieved.

[0031] It should be noted that all electronic devices in this invention are controlled by an external controller (including but not limited to a PLC controller) to perform orderly functions.

[0032] In summary, the wastewater to be treated is poured into wastewater tank 1. Motor b12 drives gear b22 to rotate intermittently, which in turn drives gear a11 to rotate slowly and intermittently. Gear a11 then drives the outer pipe 7 to rotate slowly and intermittently. The outer pipe 7 drives the retrieval pipe and the filtration section in intermittent circular motion. As the filtration section moves through the wastewater, the wastewater passes through the clustered fiber clumps on the surface of the spherical shell 9. Fine silt, colloidal flocs, and tiny suspended impurities remaining in the wastewater are entangled and physically trapped by the fiber bundles 8. Simultaneously, the activated carbon particles loaded on the fiber bundles 8 adsorb trace amounts of COD and color in the water. It removes dissolved small molecule pollutants such as chlorine, a small amount of oil, and heavy metal ions; it achieves the function of filtering out fine impurities in wastewater; when the retrieval rod 14 moves out from inside the wastewater, it can retrieve large-volume garbage floating on the water surface. When the retrieval rod 14 rotates to approach the opening b601, the retrieval rod 14 is tilted, and the large-volume garbage will slide down the retrieval rod 14 under its own gravity and enter the inner pipe 6 through the opening a701 and the opening b601; it realizes the automatic retrieval function of floating garbage in wastewater, and thus simultaneously realizes the multi-stage treatment function of wastewater, significantly improving the wastewater treatment efficiency.

[0033] When the filter section rotates to directly above the opening b601, the motor b12 stops working. At this time, the outer tube 7 stops rotating. By drawing air out of the airbag 27 and discharging it into the box 16, the airbag 27 can be deflated. After the airbag 27 deflates, it will cause the fiber bundle 8 to retract into the spherical shell 9. At this time, the cluster of fibers 8 will disintegrate, and the bound impurities will automatically fall off and fall into the inner tube 6 through the openings a701 and b601, realizing the self-cleaning function of impurities. Subsequently, the air pump 26 works again, causing the airbag 27 to expand and the fiber bundle 8 to reset and form a cluster of fibers. This ensures that the filter section has the maximum filtration efficiency each time it enters the wastewater.

[0034] By turning on motor a3, motor a3, together with synchronous pulley and synchronous toothed belt, drives the conveyor shaft to rotate. The conveyor shaft drives the spiral conveyor blade 17 to rotate. The spiral conveyor blade 17 realizes the function of conveying garbage and impurities, and finally discharges them through discharge pipe 13 for easy recycling by staff.

[0035] After the filtration unit completes the wastewater filtration function, there may be a small amount of free impurities in the wastewater. At this time, flocculant can be added to the wastewater to make the remaining impurities gather and settle. After the settling is completed, the valve on the drain pipe 101 is opened to discharge the purified wastewater to the next treatment process. After the wastewater is discharged, the telescopic component 2 drives the slide plate 4 to move upward. The slide plate 4 drives the L-shaped plate 18 to move upward. The L-shaped plate 18 drives the inner pipe 6 to move upward. The inner pipe 6 drives the outer pipe 7 to move upward. The outer pipe 7 drives the hollow plate 20 to move upward through the support plate 10, so that the hollow plate 20 moves upward to near the top of the wastewater pool 1, which is convenient for the staff to clean the settled impurities.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A multi-stage separation wastewater treatment device for construction engineering, comprising a wastewater tank (1), characterized in that, Also includes: The processing mechanism includes a filter section, an inner tube (6), an outer tube (7), a retrieval rod (14), a conveying shaft, a spiral conveying blade (17), a support section, an air conveying section, a motor a (3), and a motor b (12); the support section is connected to the wastewater tank (1); the inner tube (6) is connected to the support section; one end of the inner tube (6) is detachably connected to a discharge pipe (13); the conveying shaft is rotatably connected inside the inner tube (6); the spiral conveying blade (17) is connected to the conveying shaft; the motor a (3) is located on the support section and is connected to the conveying shaft for transmission; the outer tube (7) is rotatably located outside the inner tube (6); the retrieval rod (14) has multiple rows and is circumferentially distributed on the outer tube (7); the air conveying section is connected to one end of the retrieval rod (14) and is connected to the filter section; the motor b (12) is located on the support section and is connected to the outer tube (7) for transmission. The filter section includes a spherical shell (9), an air bladder (27), a fiber bundle (8), and a connecting tube (25); one end of the connecting tube (25) is connected to the air supply section; the other end of the connecting tube (25) is connected to the air bladder (27); the fiber bundle (8) is densely distributed on the surface of the air bladder (27); activated carbon particles are provided on the surface of the fiber bundle (8); the spherical shell (9) is fitted on the outside of the air bladder (27) and has holes for the fiber bundle (8) to pass through; An aeration mechanism is located at the bottom of the wastewater pool (1) for aerating the wastewater.

2. The multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, The aeration mechanism includes a hollow plate (20), an aeration valve (21), a blower (19), a pipe (24), and a sealing frame (23); the sealing frame (23) is connected to the inner wall of the wastewater tank (1); the hollow plate (20) is slidably disposed in the wastewater tank (1) and closely attached to the sealing frame (23); multiple sets of aeration valves (21) are provided and evenly distributed on the hollow plate (20); the blower (19) is disposed at the bottom of the wastewater tank (1) and is connected to the hollow plate (20) through the pipe (24).

3. The multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, The support includes a guide rail (5), a slide plate (4), and an L-shaped plate (18); the guide rail (5) is connected to the side wall of the wastewater pool (1); the slide plate (4) is slidably connected to the guide rail (5); the L-shaped plate (18) is connected to the slide plate (4); the motor a (3) is connected to the L-shaped plate (18); one end of the L-shaped plate (18) is connected to the inner tube (6).

4. The multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, The output end of motor a (3) and one end of the conveying shaft are both connected to synchronous pulleys; a synchronous toothed belt is connected between the synchronous pulleys on both sides.

5. A multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, Gear a (11) is connected to the outer tube (7); gear b (22) is connected to the output end of motor b (12); gear b (22) meshes with gear a (11).

6. A multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, The outer tube (7) has multiple circumferentially distributed openings a (701); the inner tube (6) has an opening b (601) at the top.

7. A multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, The gas delivery unit includes a hollow pipe (15), a box (16), an air pump (26), and a main pipe; the hollow pipe (15) is connected to the retrieval rod (14); the box (16) is connected to one end of the hollow pipe (15); the main pipe is connected inside the hollow pipe (15); the connecting pipe (25) is connected to the main pipe; the air pump (26) is located inside the box (16) and is connected to the main pipe.

8. A multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, A support plate (10) is connected to the hollow plate (20); the top of the support plate (10) is rotatably connected to the outer tube (7).

9. A multi-stage separation wastewater treatment device for building engineering according to claim 3, characterized in that, The side wall of the wastewater pool (1) is connected to a telescopic component (2); the telescopic component (2) is connected to the sliding plate (4).

10. A multi-stage separation wastewater treatment device for building engineering according to claim 1, characterized in that, A drain pipe (101) is connected to the side wall of the wastewater pool (1); a valve is provided on the drain pipe (101).

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