Magnetic coagulation and sedimentation device

Abstract

This application relates to a magnetic coagulation sedimentation device, comprising: a coagulation tank, a mixing tank, a flocculation tank, and a sedimentation tank. The flocculation tank is equipped with drop weirs on three sides, including one long-side drop weir and two short-side drop weirs. The sedimentation tank is divided into a pre-distribution zone and a post-distribution zone. Wastewater in the long-side drop weir flows directly to the pre-distribution zone, while water from the two short-side drop weirs falls into a drop channel and then flows by gravity into a distribution pipe to the post-distribution zone. This disperses the wastewater flow received at the sedimentation tank inlet, preventing sludge buildup in the sedimentation tank and making the scheme of manufacturing the magnetic coagulation sedimentation device first and then transporting it to the site of use feasible, thus facilitating the promotion of magnetic coagulation sedimentation technology.

Description

Technical Field

[0001] This application belongs to the field of wastewater treatment technology, and in particular relates to a magnetic coagulation sedimentation device. Background Technology

[0002] Magnetic coagulation sedimentation tanks are a water treatment technology that combines traditional coagulation sedimentation processes with the enhancement effect of magnetic media. Its core principle is that wastewater, coagulant (such as PAC), magnetic powder, and coagulant aid (such as PAM) come into full contact in the mixing reaction zone. The coagulant destabilizes suspended particles through charge neutralization, while the magnetic powder acts as a carrier dispersed in the water. Under stirring, the destabilized particles collide to form flocs, and the magnetic powder adsorbs and binds to the flocs, forming denser and more compact magnetic flocs. The coagulant aid further promotes the bonding between flocs and enhances their mechanical strength. Due to the significantly increased density (magnetic powder density is approximately 5 times that of water), the magnetic flocs settle rapidly under gravity, with a settling velocity reaching 40 m / h, 20 times that of traditional processes. For stable operation, wastewater treatment typically selects a settling velocity of 20-25 m / h, with a residence time of approximately 15-25 minutes in the sedimentation zone. The sedimentation tank is designed to be relatively tall, typically 5-8 meters high. The sedimentation area is square, allowing wastewater from the coagulation and flocculation tanks to enter the sedimentation zone from one side. This results in good hydraulic distribution and effective sedimentation, but the entire tank cannot be transported as a whole. The settled sludge containing magnetic powder is returned to the magnetic powder mixing reaction zone, while the remaining sludge is processed by a magnetic powder recovery machine to recover the magnetic powder. This process achieves directional adsorption, separation, and recycling of the magnetic powder before returning it to the magnetic powder mixing reaction zone, reducing operating costs. The remaining sludge is discharged into a sludge tank.

[0003] The addition of magnetic powder significantly increases floc density and settling velocity, shortens hydraulic retention time, and improves treatment efficiency. It can treat water containing suspended solids, colloids, and some dissolved pollutants, performing particularly well under low temperature and low turbidity conditions, and has wide adaptability. The high-speed settling characteristics reduce equipment volume by 30%-50% compared to traditional processes, requiring less floor space.

[0004] In existing technologies, magnetic coagulation sedimentation tanks are generally manufactured on-site, and rarely manufactured in other locations and then transported to the site of use, making them difficult to promote.

[0005] To allow the magnetic coagulation sedimentation unit to be manufactured before being transported to the site of use, the height and width of the sedimentation tank need to be reduced to pass through height- and width-restricted road sections. However, when the height of the sedimentation tank is reduced, the flow velocity at its inlet is very high, which will also re-roll up the sludge that has settled in the sludge zone. At the same time, a large amount of muddy water will cause a large flow of water in the inclined tube packing layer near the pre-distribution water zone, resulting in poor sedimentation effect of sludge in the inclined tube packing layer. When the treatment volume is large, sludge is easily carried to the clear water zone, causing sludge to turn over in the sedimentation tank. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to resolve the conflict between the structure of the magnetic coagulation sedimentation device and the transportation requirements in the prior art, thereby providing a magnetic coagulation sedimentation device.

[0007] The technical solution adopted by this invention to solve its technical problem is: A magnetic coagulation sedimentation device, comprising: A coagulation tank is used to feed wastewater that needs to be treated. A mixing tank is used to receive the wastewater treated by the coagulation tank; A flocculation tank is used to receive wastewater treated by the mixing tank; the flocculation tank is rectangular in shape and includes a long-side drop weir located at the long side of the rectangle and two short-side drop weirs located at the two short sides of the rectangle. A sedimentation tank is used to receive wastewater treated by the flocculation tank; it includes a cascade channel, a distribution pipe, a front distribution area, and a rear distribution area; the cascade channel is arranged below both sides of the short-side cascade weir to receive wastewater discharged from the short-side cascade weir; the front distribution area is arranged below the long-side cascade weir to receive wastewater discharged from the long-side cascade weir; the rear distribution area is located on the side of the front distribution area away from the flocculation tank, and the rear distribution area is connected to the cascade channel through the distribution pipe to receive wastewater discharged from the cascade channel.

[0008] Preferably, in the magnetic coagulation sedimentation device of the present invention, there is an isolation wall between the front water distribution zone and the rear water distribution zone, and one end of the water distribution pipe passes through the isolation wall and communicates with the rear water distribution zone.

[0009] Preferably, in the magnetic coagulation sedimentation device of the present invention, the length of one of the long-side drop weirs is the sum of the lengths of the two short-side drop weirs.

[0010] Preferably, in the magnetic coagulation sedimentation device of the present invention, the length ratio of the long side waterfall to the short side waterfall is 2:1. The magnetic coagulation sedimentation device also includes a baffle plate, which is movably installed at the long side waterfall (12) and the short side waterfall (13). By moving the baffle plate, the drainage volume of the long side waterfall (12) and the short side waterfall (13) can be adjusted.

[0011] Preferably, in the magnetic coagulation sedimentation device of the present invention, the ratio of the water volume processed by the pre-water distribution zone to the water volume processed by the post-water distribution zone is 3:2 to 1:1.

[0012] Preferably, the magnetic coagulation sedimentation device of the present invention is within 13.5m in length, within 3.6m in width, and within 3.2m in height, and the aspect ratio of the magnetic coagulation sedimentation device is greater than or equal to 3.7:1.

[0013] Preferably, in the magnetic coagulation sedimentation device of the present invention, the sedimentation tank further includes: an inclined tube packing layer, a lower water distribution and sludge zone, and a sludge hopper; the inclined tube packing layer is arranged below the front water distribution zone and the rear water distribution zone, the lower water distribution and sludge zone is arranged below the inclined tube packing layer, and the sludge hopper is arranged below the lower water distribution and sludge zone.

[0014] Preferably, in the magnetic coagulation sedimentation device of the present invention, the sedimentation tank has a height of 3.1m; the front water distribution zone and the rear water distribution zone are, from bottom to top, a water surface protection zone and a clear water zone, with the water surface protection zone having a height of 0.25m and the clear water zone having a height of 0.66m; the inclined tube packing layer has a height of 0.69m; the lower water distribution and sludge zone has a height of 1.1m; and the sludge hopper has a height of 0.4m.

[0015] Preferably, the magnetic coagulation sedimentation device of the present invention further includes: A horizontal chain scraper is installed in the lower water distribution and sludge zone; A horizontal screw conveyor is installed inside the sludge hopper; A horizontal chain plate scraper drive device is located at the top of the sedimentation tank and is used to drive the horizontal chain plate scraper. A horizontal screw conveyor drive unit is located at the top of the sedimentation tank and is used to drive the horizontal screw conveyor.

[0016] Preferably, in the magnetic coagulation sedimentation device of the present invention, the sedimentation tank further includes: a plurality of water collection tanks, which are evenly arranged in the clear water zone for discharging the treated water in the clear water zone.

[0017] The beneficial effects of this invention are as follows: The flocculation tank is equipped with drop weirs on three sides, including one long-side drop weir and two short-side drop weirs, dividing the sedimentation tank into a front water distribution zone and a rear water distribution zone. Wastewater from the long-side drop weirs flows directly to the front water distribution zone, while water from the two short-side drop weirs falls into the drop channel and then flows by gravity into the distribution pipe to the rear water distribution zone. This disperses the wastewater flow received at the sedimentation tank inlet, preventing sludge buildup in the sedimentation tank. It also makes the scheme of manufacturing the magnetic coagulation sedimentation device first and then transporting it to the site of use feasible, facilitating the promotion of magnetic coagulation sedimentation tank technology. Attached Figure Description

[0018] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a top view schematic diagram of the magnetic coagulation sedimentation device according to an embodiment of this application; Figure 2 This is a schematic diagram of the longitudinal section of the magnetic coagulation sedimentation device according to an embodiment of this application.

[0020] The attached figures are labeled as follows: 1. Coagulation tank; 2. Mixing tank; 3. Flocculation tank; 12. Long-side drop weir; 13. Short-side drop weir; 14. Drop channel; 15. Water distribution pipe; 4. Sedimentation tank; 16. Pre-distribution area; 17. Post-distribution area; 18. Lower distribution and sludge area; 19. Horizontal chain scraper; 20. Sludge hopper; 21. Horizontal screw conveyor; 22. Horizontal chain scraper drive device; 23. Horizontal screw conveyor drive device; 24. Inclined tube packing layer; 25. Clear water area; 26. Water collection tank; 5. First mixer; 6. Second mixer; 7. Third mixer; 8. Return sludge pump; 9. Excess sludge pump; 10. High-speed shearing machine; 11. Magnetic powder separator. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0022] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] The technical solution of this application will now be described in detail with reference to the accompanying drawings and embodiments. Example This embodiment provides a magnetic coagulation sedimentation device, such as... Figure 1 , Figure 2 As shown, it includes: coagulation tank 1, mixing tank 2, flocculation tank 3 and sedimentation tank 4.

[0025] The coagulation tank 1 is used to supply the sewage to be treated; the mixing tank 2 is used to receive the sewage treated by the coagulation tank 1; the flocculation tank 3 is used to receive the sewage treated by the mixing tank 2; the flocculation tank 3 is rectangular in shape and includes a long-side drop weir 12 located at the long side of the rectangle and two short-side drop weirs 13 located at the two short sides of the rectangle; the sedimentation tank 4 is used to receive the sewage treated by the flocculation tank 3.

[0026] The sedimentation tank 4 includes a drop channel 14, a water distribution pipe 15, a front water distribution area 16, and a rear water distribution area 17. The drop channel 14 is arranged below both sides of the short-side drop weir 13 and is used to receive the sewage discharged from the short-side drop weir 13. The front water distribution area 16 is arranged below the long-side drop weir 12 and is used to receive the sewage discharged from the long-side drop weir 12. The rear water distribution area 17 is located on the side of the front water distribution area 16 away from the flocculation tank 3. The rear water distribution area 17 is connected to the drop channel 14 through the water distribution pipe 15 to receive the sewage discharged from the drop channel 14.

[0027] In this embodiment of the magnetic coagulation sedimentation device, the flocculation tank 3 is equipped with drop weirs on three sides, including one long-side drop weir 12 and two short-side drop weirs 13. The sedimentation tank 4 is divided into a front water distribution zone 16 and a rear water distribution zone 17. The wastewater in the long-side drop weir 12 flows directly to the front water distribution zone 16, while the water from the two short-side drop weirs 13 falls into the drop channels 14 and then flows into the distribution pipe 15 by gravity to the rear water distribution zone 17. This disperses the wastewater flow at the inlet of the sedimentation tank 4, with part of it being received by the front water distribution zone 16 and the other part being received by the drop channels 14 on both sides and flowing into the rear water distribution zone 17. This avoids sludge backflow in the sedimentation tank 4 under the constraints of limited height and width, making the scheme of manufacturing the magnetic coagulation sedimentation device first and then transporting it to the site of use feasible and facilitating the promotion of magnetic coagulation sedimentation technology.

[0028] In this embodiment of the magnetic coagulation sedimentation device, coagulation tank 1, mixing tank 2, and flocculation tank 3 are the dosing reaction zones of the magnetic coagulation sedimentation device and are located at the front end of the entire device. The processing steps during use are as follows: Wastewater first enters coagulation tank 1, where a coagulant (such as PAC) is added. Wastewater enters mixing tank 2 from coagulation tank 1. At the same time, sludge pumped by sludge pump 8 returns to mixing tank 2. The sludge pumped by the remaining sludge pump 9 first goes to high-speed shear machine 10 and then to magnetic powder recovery machine. The magnetic powder recovered by magnetic powder recovery machine returns to this tank. The lost magnetic powder is replenished in this tank regularly. Flocculation tank 3 receives the wastewater discharged from mixing tank 2 and adds flocculants, such as polyacrylamide (PAM). The flocculation tank 3 has effluent weirs on three sides, with the weirs having the same height. Some sewage is discharged directly from the long-side drop weir 12 to the front water distribution area 16. Sewage discharged from the two short-side drop weirs 13 falls into the drop channel 14 and then flows into the distribution pipe 15 to the rear water distribution area 17 by gravity. The magnetic coagulation sedimentation device also includes baffles, which are movably installed at the long-side drop weir 12 and the short-side drop weir 13. When the magnetic coagulation sedimentation device is running in this embodiment, the drainage volume of the long-side drop weir (12) and the short-side drop weir (13) can be adjusted by moving the baffles, thereby adjusting the effective weir length (referring to the weir length with drainage function; the part blocked by the baffle is not counted as the effective length) to regulate the amount of water distributed to the front water distribution area 16 and the rear water distribution area 17. The front water distribution area 16 and the rear water distribution area 17 distribute water and sludge evenly, and the water collection tank collects water evenly, which can greatly improve its capacity and operational stability.

[0029] In an optional embodiment, a partition wall is provided between the front water distribution zone 16 and the rear water distribution zone 17, and one end of the water distribution pipe 15 passes through the partition wall and communicates with the rear water distribution zone 17. In this embodiment, by physically isolating the front water distribution zone 16 and the rear water distribution zone 17, the amount of sewage received by the two zones is prevented from affecting each other, and the flow rate of sewage received by the sedimentation tank 4 is ensured to be dispersed.

[0030] In an optional embodiment, the length of one long-side drop weir 12 is the sum of the lengths of the two short-side drop weirs 13, ensuring that the flow rate of sewage received by the sedimentation tank 4 is evenly distributed.

[0031] Preferably, the length ratio of the long-side drop weir 12 to the short-side drop weir 13 is 2:1, that is, the total length of the long-side drop weir 12 and the total length of the short-side drop weir 13 are the same, which further ensures that the flow rate of the sedimentation tank 4 is evenly distributed when receiving sewage.

[0032] In an optional embodiment, the ratio of the treated water volume of the front water distribution zone 16 to the treated water volume of the rear water distribution zone 17 is 3:2 to 1:1, that is, the treated water volume of the front water distribution zone 16 accounts for 50 to 60%, and the treated water volume of the rear water distribution zone 17 accounts for 50 to 40%, which can receive the sewage discharged from the three sides of the flocculation tank 3 in a relatively balanced manner.

[0033] In one optional embodiment, the magnetic coagulation sedimentation device has a length of no more than 13.5m, a width of no more than 3.6m, and a height of no more than 3.2m, with an aspect ratio greater than or equal to 3.7:1. In this embodiment, this size design ensures that the device can comply with the width and height restrictions of most roads during transportation, and the moderate aspect ratio of the magnetic coagulation sedimentation device enables it to achieve good wastewater treatment results.

[0034] In an alternative embodiment, such as Figure 2As shown, the sedimentation tank 4 also includes: an inclined tube packing layer 24, a lower water distribution and sludge zone 18, and a sludge hopper 20; the inclined tube packing layer 24 is arranged below the front water distribution zone 16 and the rear water distribution zone 17, the lower water distribution and sludge zone 18 is arranged below the inclined tube packing layer 24, and the sludge hopper 20 is arranged below the lower water distribution and sludge zone 18. The inclined tube packing layer 24 is used for sedimentation and purification of sludge in the upper sewage, the lower water distribution and sludge zone 18 is used for sewage transportation, and the sludge hopper 20 is used for sludge discharge.

[0035] In an optional embodiment, the sedimentation tank 4 has a height of 3.1m; the front water distribution zone 16 and the rear water distribution zone 17 are, from bottom to top, a water surface protection zone and a clear water zone 25, with the water surface protection zone having a height of 0.25m and the clear water zone 25 having a height of 0.66m; the inclined tube packing layer 24 (including the inclined tube packing and support) has a height of 0.69m, and the lower water distribution and sludge zone 18 has a height of 1.1m. Preferably, the lower water distribution and sludge zone each occupy approximately 50% of the height, and the sludge hopper 20 has a height of 0.4m. In this embodiment, the height of the sedimentation tank 4 is controlled at 3.1m, and this height limit can be met through the height design of the above layers.

[0036] In an alternative embodiment, such as Figure 1 , Figure 2 As shown, the magnetic coagulation sedimentation device also includes: a horizontal chain scraper 19, a horizontal chain scraper drive device 22, a horizontal screw conveyor 21, and a horizontal screw conveyor drive device 23. The horizontal chain scraper 19 is located in the lower water distribution and sludge zone 18; the horizontal screw conveyor 21 is located in the sludge hopper 20; the horizontal chain scraper drive device 22 is located at the top of the sedimentation tank 4 and is used to drive the horizontal chain scraper 19; the horizontal screw conveyor drive device 23 is located at the top of the sedimentation tank 4 and is used to drive the horizontal screw conveyor 21. In this embodiment, the above components participate in the conveying and discharge of sludge.

[0037] In an alternative embodiment, such as Figure 1 , Figure 2 As shown, the sedimentation tank 4 also includes several water collection tanks 26, which are evenly arranged in the clear water zone 25 for discharging the treated water from the clear water zone 25. Preferably, there are 6 water collection tanks 26, evenly arranged, so that the treated water is discharged and collected relatively evenly.

[0038] In an optional embodiment, the coagulation tank 1 is equipped with one first mixer 5, the mixing tank 2 is equipped with one second mixer 6, and the flocculation tank 3 is equipped with two third mixers 7.

[0039] The process principle of the magnetic coagulation sedimentation device in this embodiment is as follows: Magnetic coagulation sedimentation tanks are a water treatment technology that combines traditional coagulation sedimentation processes with the enhancement effect of magnetic media. Its core principle is that wastewater, coagulants (such as PAC), magnetic powder, and coagulant aids (such as PAM) come into full contact in the mixing reaction zone. The coagulant destabilizes suspended particles through charge neutralization, while the magnetic powder acts as a carrier dispersed in the water. Under stirring, the destabilized particles collide to form flocs, and the magnetic powder adsorbs and binds to the flocs, forming denser and more compact magnetic flocs. The coagulant aid further promotes the bonding between flocs and enhances their mechanical strength. Due to the significant increase in density, the magnetic flocs settle rapidly under gravity. The settled sludge containing magnetic powder is returned to the magnetic powder mixing reaction zone, while the remaining sludge is processed by a magnetic powder separator 11 to recover the magnetic powder, achieving directional adsorption, separation, and recycling of the magnetic powder. The magnetic powder is returned to the magnetic powder mixing reaction zone, and the remaining sludge is discharged to a sludge tank.

[0040] This embodiment utilizes the existing processing capacity of 5000m. 3 The sedimentation device was modified according to the structure of the magnetic coagulation sedimentation device provided in this embodiment, and the measured processing capacity was increased to 8000m³. 3 / d.

[0041] Based on the above-described preferred embodiments according to this application, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A magnetic coagulation sedimentation device, characterized by include: Coagulation tank (1), used for the introduction of sewage to be treated; Mixing tank (2) is used to receive the wastewater treated by the coagulation tank (1); The flocculation tank (3) is used to receive the sewage treated by the mixing tank (2); the flocculation tank (3) is rectangular in shape and includes a long-side drop weir (12) located on the long side of the rectangle and two short-side drop weirs (13) located on the two short sides of the rectangle. A sedimentation tank (4) is used to receive wastewater treated by the flocculation tank (3); it includes a drop channel (14), a water distribution pipe (15), a front water distribution area (16), and a rear water distribution area (17); the drop channel (14) is arranged below both sides of the short-side drop weir (13) to receive wastewater discharged from the short-side drop weir (13); the front water distribution area (16) is arranged below the long-side drop weir (12) to receive wastewater discharged from the long-side drop weir (12); the rear water distribution area (17) is located on the side of the front water distribution area (16) away from the flocculation tank (3); the rear water distribution area (17) is connected to the drop channel (14) through the water distribution pipe (15) to receive wastewater discharged from the drop channel (14).

2. The magnetic coagulation sedimentation device according to claim 1, characterized in that There is an isolation wall between the front water distribution area (16) and the rear water distribution area (17), and one end of the water distribution pipe (15) passes through the isolation wall and is connected to the rear water distribution area (17).

3. The magnetic coagulation and sedimentation device according to claim 1, characterized in that The length of one of the long-side drop weirs (12) is the sum of the lengths of the two short-side drop weirs (13).

4. The magnetic coagulation and sedimentation device according to claim 3, characterized in that The length ratio of the long-side drop weir (12) to the short-side drop weir (13) is 2:

1. The magnetic coagulation sedimentation device also includes a baffle plate, which is movably installed at the long-side drop weir (12) and the short-side drop weir (13). By moving the baffle plate, the drainage volume of the long-side drop weir (12) and the short-side drop weir (13) can be adjusted.

5. The magnetic coagulation and sedimentation device according to any one of claims 1 to 4, characterized in that The ratio of the water volume treated by the front water distribution zone (16) to that treated by the rear water distribution zone (17) is 3:2 to 1:

1.

6. The magnetic coagulation and sedimentation device according to any one of claims 1 to 4, characterized in that The length of the magnetic coagulation sedimentation device is within 13.5m, the width is within 3.6m, and the height is within 3.2m. The length-to-width ratio of the magnetic coagulation sedimentation device is greater than or equal to 3.7:

1.

7. The magnetic coagulation sedimentation device according to any one of claims 1 to 4, characterized in that The sedimentation tank (4) further includes: an inclined tube packing layer (24), a lower water distribution and sludge zone (18), and a sludge hopper (20); the inclined tube packing layer (24) is arranged below the front water distribution zone (16) and the rear water distribution zone (17), the lower water distribution and sludge zone (18) is arranged below the inclined tube packing layer (24), and the sludge hopper (20) is arranged below the lower water distribution and sludge zone (18).

8. The magnetic coagulation and sedimentation device according to claim 7, characterized in that The sedimentation tank (4) has a height of 3.1m; the front water distribution area (16) and the rear water distribution area (17) are a water surface protection area and a clear water area (25) from bottom to top along the height direction, the water surface protection area has a height of 0.25m and the clear water area (25) has a height of 0.66m; the inclined tube packing layer (24) has a height of 0.69m, the lower water distribution and sludge area (18) has a height of 1.1m and the sludge hopper (20) has a height of 0.4m.

9. The magnetic coagulation and sedimentation device according to claim 7, characterized in that The magnetic coagulation sedimentation device also includes: A horizontal chain scraper (19) is installed in the lower water distribution and sludge zone (18); A horizontal screw conveyor (21) is installed inside the sludge hopper (20); The horizontal chain plate scraper transmission device (22) is located at the top of the sedimentation tank (4) and is used to drive the horizontal chain plate scraper (19). A horizontal screw conveyor drive unit (23) is located at the top of the sedimentation tank (4) and is used to drive the horizontal screw conveyor (21).

10. The magnetic coagulation precipitation device according to claim 8, characterized in that, The sedimentation tank (4) further includes: several water collection tanks (26), which are evenly arranged in the clear water area (25) for discharging the treated water in the clear water area (25).

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