Coagulating sedimentation circulating device for sewage treatment

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to a coagulating sedimentation circulating device for sewage treatment, which comprises a stirring tank, a sedimentation tank is arranged on one side of the stirring tank, a water outlet pipe is connected in the sedimentation tank, a dosing pipe is arranged in the stirring tank, a sewage inlet pipe is arranged in the stirring tank, and a sludge outlet pipe is connected in the sedimentation tank. A sludge return pipe is fixedly connected to the sludge outlet pipe, a first electromagnetic flowmeter, a control valve and a separation box are sequentially assembled on the side wall of the sludge return pipe, and a second electromagnetic flowmeter is assembled on the sludge inlet pipe; a partition plate is fixedly connected to the inner wall of the separation box, an annular plate is rotationally connected to the top face of the separation box, and the annular plate penetrates through the separation box. A small amount of settled sludge can be discharged into the separation box, and the sludge is divided into large-granule sludge and small-granule sludge, so that the large-granule sludge and the small-granule sludge can be conveniently selected and used according to sewage treatment requirements, and impurities in sewage are assisted to settle.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and specifically relates to a coagulation and sedimentation circulation device for sewage treatment. Background Art

[0002] Coagulation is a fundamental and crucial process in the treatment of industrial water and domestic wastewater. By adding chemicals (commonly known as coagulants and flocculants) to the water, particles that are difficult to settle aggregate into colloids, which then combine with impurities in the water to form larger flocs. Flocs possess a strong adsorption capacity, absorbing not only suspended solids but also some bacteria and soluble substances. Through adsorption, flocs increase in size and sink.

[0003] During the wastewater treatment process, adding a small amount of sludge can have a certain impact on the effectiveness of flocculants. This practice is known as "sludge recycling" or "sludge return." However, when using sludge return, the size of the sludge particles has a significant impact on the sedimentation effect. For example, large sludge particles generally have better settling properties, allowing them to be quickly separated from the wastewater, helping to improve the efficiency of the sedimentation tank. Small sludge particles generally have higher microbial activity, enabling more effective degradation of organic matter and improving the efficiency of biological treatment.

[0004] The existing method of utilizing sludge return is to directly discharge the sludge into the stirring tank to assist flocculation and sedimentation. Although it can achieve a certain flocculation and sedimentation effect, it does not set up a corresponding virtual circulation pipeline (such as Figure 8 As shown in the figure, since the particle size content in the discharged sludge is different, and the sewage comes from industrial water or domestic water, the amount of impurities and impurity characteristics in the sewage are different, if the sludge of the same standard is discharged, it is easy to cause unsatisfactory flocculation effect; for example: when the sewage contains a large amount of large-particle impurities, if the discharged sludge is large, the small-particle sludge is not easy to form flocculation effect with the large-particle impurities, resulting in poor sedimentation performance, and it is easy to be discharged from the sedimentation tank together with the upper clear water, thereby increasing the load of the treatment system. Utility Model Content

[0005] The purpose of this utility model is to provide a coagulation sedimentation circulation device for sewage treatment, which can select a small amount of precipitated sludge and discharge it into a separation box, and divide the sludge into large-particle sludge and small-particle sludge, so that it can be selected and used according to the sewage treatment needs, and assist in the sedimentation of impurities in the sewage.

[0006] The technical solutions adopted in this application are as follows:

[0007] A coagulation and sedimentation circulation device for sewage treatment, comprising a stirring tank, a sedimentation tank provided on one side of the stirring tank, a water outlet pipe connected to the sedimentation tank, a dosing pipe provided in the stirring tank, a sewage inlet pipe provided in the stirring tank, a mud outlet pipe connected to the sedimentation tank, a sludge return pipe fixedly connected to the mud outlet pipe, a first electromagnetic flowmeter, a control valve and a separation box being sequentially mounted on the sidewall of the sludge return pipe, and a second electromagnetic flowmeter being mounted on the sewage inlet pipe;

[0008] The inner wall of the separation box is fixedly connected to a partition, the top surface of the separation box is rotatably connected to an annular plate, the annular plate passes through the separation box, and the top surface of the separation box is provided with a transmission assembly;

[0009] The inner cavity of the separation box is provided with a mud discharge pipe on the upper side of the partition, the mud discharge pipe is U-shaped, the side wall of the mud discharge pipe is fixedly connected to a transfer pipe, the transfer pipe passes through the top surface of the separation box and is movably connected thereto, the side wall of the mud discharge pipe is provided with a shaking assembly, the bottom end of the mud discharge pipe is fixedly connected to a tapered tube, the inner wall of the tapered tube is equipped with a filter screen, the filter screen and the tapered tube are connected by bolts, and the other end of the transfer pipe is provided with a flow guide assembly;

[0010] The side wall of the separation box is provided with a diversion component, and the side wall of the separation box is fixedly connected to a mud inlet pipe located on the upper side of the partition, and the mud inlet pipe is communicated with the sludge return pipe.

[0011] The transmission assembly includes a plurality of gear blocks fixedly connected to the side wall of the annular plate, and the gear blocks are distributed in an annular array. The top surface of the separation box is equipped with a motor, and the motor output shaft is fixedly connected to a gear, and the gear is engaged with the gear block.

[0012] The shaking assembly includes a fixed plate fixedly connected to the side wall of the transfer tube, and the top surface of the separation box is fixedly connected to a wave plate, the wave plate is annular, the wave plate is concentric with the transfer tube, the fixed plate is in contact with the upper surface of the wave plate, and the side wall of the transfer tube is provided with a rebound assembly.

[0013] A movable wheel is mounted on the bottom surface of the fixed plate near the end surface, and the movable wheel abuts against the upper surface of the wave plate.

[0014] A slider is fixedly connected to the side wall of the transfer tube, a sliding groove is provided on the inner wall of the annular plate, the slider is slidably connected to the sliding groove, and a spring is fixedly connected between the bottom surface of the slider and the bottom surface of the sliding groove.

[0015] The diversion assembly includes a mud discharge pump fixedly connected to the side wall of the separation box, and two diversion pipes are connected to the mud discharge pump. The other end of the upper diversion pipe is fixedly connected to a bellows, and the other end of the bellows is rotatably connected to the transfer pipe. The other end of the lower diversion pipe extends to the inner cavity of the separation box and is located on the lower side of the partition.

[0016] The diversion assembly includes a tee pipe fixedly connected to the side wall of the separation box, one end of the tee pipe is connected to the sludge return pipe, and the other two ends of the tee pipe are connected to the separation box. The other two ends of the tee pipe are respectively located on the upper and lower sides of the partition, and the side wall of the tee pipe is equipped with two valves.

[0017] The technical effects achieved by this utility model are:

[0018] The present invention provides a practical coagulation and sedimentation circulation device for sewage treatment, which can select a small amount of precipitated sludge and discharge it into a separation box, and divide the sludge into large-particle sludge and small-particle sludge, so that it can be selected and used according to the sewage treatment needs, and assists the sedimentation of impurities in the sewage, increases the sedimentation rate of impurities in the sewage, and makes the effluent in the sedimentation tank stable. In addition, by discharging sludge into the stirring tank, the dosage of flocculants and coagulants can be reduced, and by circulating the sludge internally, 10%-30% of the dosage of the agents can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall layout of this practical embodiment;

[0020] Figure 2 It is a three-dimensional diagram of the separation box of this practical embodiment;

[0021] Figure 3 This is a schematic cross-sectional view of the separation box of this practical embodiment;

[0022] Figure 4 This is a three-dimensional diagram of the mud discharge pipe of this practical embodiment;

[0023] Figure 5 This is a bottom view of the tapered tube structure of this practical embodiment;

[0024] Figure 6 This is a schematic structural diagram of the corrugated plate of this practical embodiment;

[0025] Figure 7 This is a practical embodiment Figure 3 A magnified view of point A in the figure;

[0026] Figure 8 This is a pipeline distribution diagram of sewage treatment in the prior art.

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0028] 1. Mixing tank; 2. Sedimentation tank; 3. Outlet pipe; 4. Dosing pipe; 5. Sewage inlet pipe; 6. Mud outlet pipe; 7. Sludge return pipe; 8. First electromagnetic flowmeter; 9. Control valve; 10. Second electromagnetic flowmeter; 11. Separation box; 12. Partition; 13. Annular plate; 14. Gear block; 15. Gear; 16. Motor; 17. Mud discharge pipe; 18. Conical pipe; 19. Filter screen; 20. Adapter pipe; 21. Bellows; 22. Diversion pipe; 23. Mud discharge pump; 24. Slider; 25. Chute; 26. Spring; 27. Fixed plate; 28. Corrugated plate; 29. ​​Movable wheel; 30. Tee; 31. Valve; 32. Mud inlet pipe. DETAILED DESCRIPTION

[0029] In order to make the purpose and advantages of this utility more clear, the utility is described in detail below with reference to the embodiments. It should be understood that the following text is only used to describe one or several specific implementation methods of this utility and does not strictly limit the scope of protection specifically requested by this utility.

[0030] Example 1:

[0031] like Figures 1-8 As shown, a coagulation and sedimentation circulation device for sewage treatment includes a stirring tank 1, a sedimentation tank 2 is provided on one side of the stirring tank 1, a water outlet pipe 3 is connected to the sedimentation tank 2, a dosing pipe 4 is provided in the stirring tank 1, a sewage inlet pipe 5 is provided in the stirring tank 1, a mud outlet pipe 6 is connected to the sedimentation tank 2, a sludge return pipe 7 is fixedly connected to the mud outlet pipe 6, a first electromagnetic flowmeter 8, a control valve 9 and a separation box 11 are sequentially installed on the side wall of the sludge return pipe 7, and a second electromagnetic flowmeter 10 is installed on the sewage inlet pipe 5;

[0032] The first electromagnetic flowmeter 8 and the second electromagnetic flowmeter 10 are both existing mature technologies and are mainly used to monitor the flow of sewage sludge in this solution. Therefore, they will not be described in detail.

[0033] A partition 12 is fixedly connected to the inner wall of the separation box 11, and an annular plate 13 is rotatably connected to the top surface of the separation box 11. The annular plate 13 passes through the separation box 11, and a transmission component is provided on the top surface of the separation box 11;

[0034] The inner cavity of the separation box 11 is provided with a mud discharge pipe 17 on the upper side of the partition 12. The mud discharge pipe 17 is U-shaped. The side wall of the mud discharge pipe 17 is fixedly connected to a transfer pipe 20. The transfer pipe 20 passes through the top surface of the separation box 11 and is movably connected thereto. A shaking assembly is provided on the side wall of the mud discharge pipe 17. The bottom end of the mud discharge pipe 17 is fixedly connected to a tapered pipe 18. The inner wall of the tapered pipe 18 is equipped with a filter screen 19. The filter screen 19 and the tapered pipe 18 are connected by bolts. This bolt connection method facilitates later maintenance or replacement of the filter screen 19. A diversion assembly is provided at the other end of the transfer pipe 20.

[0035] A diversion assembly is provided on the side wall of the separation box 11 . A mud inlet pipe 32 is fixedly connected to the side wall of the separation box 11 on the upper side of the partition 12 . The mud inlet pipe 32 is communicated with the sludge return pipe 7 .

[0036] like Figure 2 and Figure 3 As shown, the transmission assembly includes several gear blocks 14 fixedly connected to the side wall of the annular plate 13, and the gear blocks 14 are distributed in an annular array. The top surface of the separation box 11 is equipped with a motor 16, and the output shaft of the motor 16 is fixedly connected to the gear 15, which meshes with the gear blocks 14.

[0037] The motor 16 and the gear 15 are arranged on the outside of the annular plate 13 . The engagement of the gear 15 with the tooth block 14 drives the annular plate 13 to rotate, and also provides power for the up and down reciprocating movement of the tapered tube 18 .

[0038] like Figure 4 and Figure 7 As shown, the shaking assembly includes a fixed plate 27 fixedly connected to the side wall of the transfer tube 20. A corrugated plate 28 is fixedly connected to the top surface of the separation box 11. The corrugated plate 28 is annular and concentric with the transfer tube 20. The fixed plate 27 contacts the upper surface of the corrugated plate 28. A rebound assembly is installed on the side wall of the transfer tube 20. A movable wheel 29 is mounted on the bottom surface of the fixed plate 27 near the end surface, and the movable wheel 29 abuts against the upper surface of the corrugated plate 28.

[0039] Specifically, when the annular plate 13 rotates, the transfer tube 20 is driven to rotate through the mud discharge tube 17, and the transfer tube 20 drives the fixed plate 27 to rotate. When the movable wheel 29 on the fixed plate 27 moves from the lowest end of the wave plate 28 to the top, the fixed plate 27 drives the conical tube 18 upward through the mud discharge tube 17. When the movable wheel 29 moves from the top to the lowest end, the conical tube 18 moves downward. The reciprocating cycle allows the conical tube 18 to rotate while performing an up and down reciprocating motion, which has a shaking effect on the sludge. On the one hand, it prevents sludge particles from clogging the filter screen 19 and shakes the filter screen 19 to shake off the particulate impurities adhering to the surface of the filter screen 19. On the other hand, it can mix the discharged sludge and quickly discharge the small particle sludge into the separation box 11 on the lower side of the partition 12.

[0040] like Figure 7 As shown, a slider 24 is fixedly connected to the side wall of the transfer tube 20, a sliding groove 25 is opened on the inner wall of the annular plate 13, the slider 24 is slidably connected to the sliding groove 25, and a spring 26 is fixedly connected between the bottom surface of the slider 24 and the bottom surface of the sliding groove 25.

[0041] Among them, when the annular plate 13 rotates, the rotational force is transmitted to the mud discharge pipe 17 through the slider 24, and when the movable wheel 29 moves from the top to the bottom, the force of the spring 26 is used to generate a downward pulling force on the fixed plate 27 to achieve a reset effect, thereby improving the stability during operation.

[0042] like Figure 2 and Figure 3 As shown, the diversion assembly includes a mud pump 23 fixedly connected to the side wall of the separation box 11, and two diversion pipes 22 are connected to the mud pump 23. The other end of the upper diversion pipe 22 is fixedly connected to the bellows 21, and the other end of the bellows 21 is rotatably connected to the transfer pipe 20. When the transfer pipe 20 drives the fixed plate 27 to rotate, it will not drive the bellows 21 to rotate. The other end of the lower diversion pipe 22 extends to the inner cavity of the separation box 11 and is located on the lower side of the partition 12.

[0043] Specifically, when the mud discharge pipe 17 drives the transfer tube 20 to move back and forth up and down, in order to avoid the movement interference of the transfer tube 20 on the guide tube 22, a bellows 21 is added at the connection position between the mud discharge pipe 17 and the transfer tube 20. The bellows 21 can be made of metal, plastic, composite materials and the like, and has good toughness and bending properties, and can offset the movement interference when the transfer tube 20 moves back and forth up and down.

[0044] like Figure 2 and Figure 3 As shown, the diversion assembly includes a tee pipe 30 fixedly connected to the side wall of the separation box 11, one end of the tee pipe 30 is connected to the sludge return pipe 7, and the other two ends of the tee pipe 30 are connected to the separation box 11. The other two ends of the tee pipe 30 are respectively located on the upper and lower sides of the partition 12, and two valves 31 are installed on the side wall of the tee pipe 30.

[0045] Specifically, the valves 31 on both sides are used to control the discharge state and discharge volume of large-particle sludge and small-particle sludge in the separation box 11, and selectively discharge sewage with different characteristics or sewage with different impurity contents; in addition, through the sludge backflow method, it has the characteristics of strong resistance to shock load, insensitivity to influent turbidity fluctuations, and strong adaptability to low-temperature and low-turbidity raw water; and it has strong flocculation ability, fast floc sedimentation speed, and stable effluent water quality. This is mainly due to the combined application of flocculants, coagulants, and activated sludge co-flow. The hydraulic load can reach 23m3 / ㎡·h. Due to the fast sedimentation speed and short flocculation sedimentation time, it is much higher than the conventional process. Through the internal circulation of sludge, the drug consumption is relatively low, which can save 10% to 30% of the drug dosage.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this application shall be implemented in accordance with conventional means in the art unless otherwise specified or limited.

Claims

1. A coagulation and sedimentation circulation device for sewage treatment, comprising a stirring tank (1), a sedimentation tank (2) provided on one side of the stirring tank (1), a water outlet pipe (3) connected to the sedimentation tank (2), a dosing pipe (4) provided in the stirring tank (1), a sewage inlet pipe (5) provided in the stirring tank (1), and a mud outlet pipe (6) connected to the sedimentation tank (2), characterized in that: The mud discharge pipe (6) is fixedly connected to a sludge return pipe (7), a first electromagnetic flowmeter (8), a control valve (9) and a separation box (11) are sequentially mounted on the side wall of the sludge return pipe (7), and a second electromagnetic flowmeter (10) is mounted on the sewage inlet pipe (5); The inner wall of the separation box (11) is fixedly connected to a partition plate (12), the top surface of the separation box (11) is rotatably connected to an annular plate (13), the annular plate (13) passes through the separation box (11), and the top surface of the separation box (11) is provided with a transmission assembly; The inner cavity of the separation box (11) is provided with a mud discharge pipe (17) on the upper side of the partition (12), and the mud discharge pipe (17) is arranged in a U shape. The side wall of the mud discharge pipe (17) is fixedly connected with a transfer pipe (20), and the transfer pipe (20) passes through the top surface of the separation box (11) and is movably connected thereto. The side wall of the mud discharge pipe (17) is provided with a shaking assembly, and the bottom end of the mud discharge pipe (17) is fixedly connected with a conical pipe (18), and the inner wall of the conical pipe (18) is equipped with a filter screen (19), and the other end of the transfer pipe (20) is provided with a flow guide assembly; The side wall of the separation box (11) is provided with a diversion assembly, and the side wall of the separation box (11) is fixedly connected to a mud inlet pipe (32) located on the upper side of the partition (12), and the mud inlet pipe (32) is communicated with the sludge return pipe (7).

2. A coagulation and sedimentation circulation device for sewage treatment according to claim 1, characterized in that: The transmission assembly comprises a plurality of tooth blocks (14) fixedly connected to the side wall of the annular plate (13), wherein the tooth blocks (14) are distributed in an annular array. A motor (16) is mounted on the top surface of the separation box (11), and a gear (15) is fixedly connected to the output shaft of the motor (16), and the gear (15) is meshed with the tooth blocks (14).

3. A coagulation and sedimentation circulation device for sewage treatment according to claim 1, characterized in that: The shaking assembly includes a fixed plate (27) fixedly connected to the side wall of the transfer tube (20), a wave plate (28) fixedly connected to the top surface of the separation box (11), the wave plate (28) is annular, the wave plate (28) is concentric with the transfer tube (20), the fixed plate (27) is in contact with the upper surface of the wave plate (28), and the side wall of the transfer tube (20) is provided with a rebound assembly.

4. A coagulation and sedimentation circulation device for sewage treatment according to claim 3, characterized in that: A movable wheel (29) is mounted on the bottom surface of the fixed plate (27) near the end surface, and the movable wheel (29) abuts against the upper surface of the wave plate (28).

5. A coagulation and sedimentation circulation device for sewage treatment according to claim 3, characterized in that: The side wall of the transfer tube (20) is fixedly connected with a slider (24), the inner wall of the annular plate (13) is provided with a slide groove (25), the slider (24) is slidably connected to the slide groove (25), and a spring (26) is fixedly connected between the bottom surface of the slider (24) and the bottom surface of the slide groove (25).

6. The coagulation and sedimentation circulation device for sewage treatment according to claim 1, characterized in that: The flow guide assembly comprises a mud discharge pump (23) fixedly connected to the side wall of the separation box (11); two flow guide pipes (22) are connected to the mud discharge pump (23); the other end of the upper flow guide pipe (22) is fixedly connected to a bellows (21); the other end of the bellows (21) is rotatably connected to a transfer pipe (20); and the other end of the lower flow guide pipe (22) extends to the inner cavity of the separation box (11) and is located below the partition (12).

7. The coagulation and sedimentation circulation device for sewage treatment according to claim 1, characterized in that: The diversion assembly includes a three-way pipe (30) fixedly connected to the side wall of the separation box (11), one end of the three-way pipe (30) is connected to the sludge return pipe (7), and the other two ends of the three-way pipe (30) are connected to the separation box (11), and the other two ends of the three-way pipe (30) are respectively located on the upper and lower sides of the partition (12), and the side wall of the three-way pipe (30) is equipped with two valves (31).

8. The coagulation and sedimentation circulation device for sewage treatment according to claim 1, characterized in that: The filter screen (19) and the tapered tube (18) are connected by bolts.

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