Sludge self-reflux nitrogen and phosphorus removal system

Abstract

The utility model relates to the technical field of sewage treatment, and discloses a sludge self-reflux denitrification and dephosphorization system, which comprises a denitrification zone, a nitrification zone, a sludge separation zone, a dephosphorization zone, a flocculation zone, a water distribution zone and a separation zone, a sludge self-flowing channel area is arranged at the lower parts of the nitrification area and the sludge separation area; sieve plate layers are arranged in the phosphorus removal area and the flocculation area; and a horizontal pipe filler is arranged in the separation area. By designing backflow channels of the nitrification area and the sludge separation area, self-backflow of sludge is realized; sieve plates are arranged in the phosphorus removal area and the flocculation area to realize physical and chemical mixed reaction; the separation area is filled with a horizontal pipe, so that the separation effect of floc particles and water is enhanced; according to the system, the front-end biochemical denitrification system and the rear-end physicochemical phosphorus removal system are organically combined, so that the sewage purification efficiency is improved, and the sewage treatment effect is fully optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sludge self-reflow denitrification and dephosphorization system. Background Art

[0002] With urban development and population growth, water resource consumption is increasing day by day, and the amount of urban sewage is also increasing, which has caused pollution to surface water and groundwater. The large amount of organic matter, pathogens and other harmful substances carried in urban sewage poses a huge threat to residents' health. Once improperly handled, it will cause more serious consequences, so it is necessary to attach great importance to urban sewage treatment.

[0003] Urban sewage treatment faces problems such as backward technology, low sludge utilization, and simultaneous compliance with nitrogen and phosphorus standards, which makes it difficult to ensure stable compliance with treated water quality standards. Therefore, combining high-efficiency biological denitrification technology, strengthening phosphorus removal technology, and optimizing sewage treatment processes to ensure effective removal of nitrogen and phosphorus pollutants in sewage so that sewage treatment can achieve the best benefits is a key research topic in the current sewage treatment field. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a sludge self-recirculation denitrification and dephosphorization system, which solves the problems raised by the above-mentioned background technology.

[0005] The utility model provides the following technical solution: a sludge self-recirculation denitrification and phosphorus removal system, comprising a denitrification zone, a nitrification zone, a sludge separation zone, a phosphorus removal zone, a flocculation zone, a water distribution zone, and a separation zone. The denitrification zone and the nitrification zone are provided with internal recirculation pipelines, and the middle of the denitrification zone and the nitrification zone are provided with rope-type fillers;

[0006] A sludge self-flow channel area is arranged at the lower part of the nitrification area and the sludge separation area; a sieve plate layer is arranged in the phosphorus removal area and the flocculation area; and a horizontal pipe filler is arranged in the separation area;

[0007] A disc aerator and a reflux pump are arranged at the bottom of the nitrification zone, and a fan connected with the disc aerator is arranged outside the nitrification zone.

[0008] Preferably, the denitrification zone is connected to a water inlet pipe, the clean water zone is connected to a water outlet pipe, a flow pipe is provided between the denitrification zone and the nitrification zone, a separation plate is provided at the lower part of the outer wall of the nitrification zone, and the parallel area between the lower side of the separation plate and the bottom inclined plate of the sludge separation zone is set as a sludge self-reflow channel.

[0009] Preferably, the phosphorus removal zone is connected to a phosphorus removal agent system, and the flocculation zone is connected to a semi-open sleeve.

[0010] Preferably, the sieve plate is composed of a plurality of layer plates arranged alternately in a longitudinal direction, and a plurality of the layer plates are provided with clearance holes, and the aperture value of the clearance holes is set to be ten to fifty millimeters.

[0011] Preferably, a sludge particle sliding channel is provided at the oblique lower part of the horizontal tube filler.

[0012] Preferably, a flow promoter is arranged on the bottom side wall of the denitrification zone, and a movable supporting plate is arranged on the upper and lower parts of the rope-type filler respectively.

[0013] The disc aerator is carefully selected, and a semi-open sleeve and a movable ring are sheathed on the outer side of the middle part; the movable ring is sheathed on the outer side of the semi-open sleeve through a sealing ring and a bearing; the bottom of the semi-open sleeve is sheathed with a branch air pipe connected to the output end of the fan; a plurality of pneumatic rotating plates are equidistantly installed on the inner wall of the movable ring; a hollow cleaning curved rod connected to its own space is connected to one side of the top of the movable ring; one end of the hollow cleaning curved rod extends along the top structural contour of the horizontal tube filler until the end of one end of the hollow cleaning curved rod is aligned with the central axis of the horizontal tube filler; a plurality of hollow brush strips facing the top surface of the disc aerator are connected to the surface of one end of the hollow cleaning curved rod.

[0014] Preferably, an inverted conical hole is opened at the top of the semi-open sleeve, and a movable sealing component is movably sleeved at the bottom of the inverted conical hole. The movable sealing component consists of an inverted T-shaped block and a return spring installed between the bottom of the inverted T-shaped block and the inner wall of the top of the semi-open sleeve.

[0015] Preferably, a guide hole aligned with the tapered hole is opened on the inner side of the middle of the inverted T-shaped block, a T-shaped guide frame is clamped in the guide hole, and a support frame is installed between the surface of the top of the T-shaped guide frame and the top surface of the semi-open sleeve.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model realizes the self-recirculation of sludge by designing the return channel between the nitrification zone and the sludge separation zone; the phosphorus removal zone and the flocculation zone are provided with sieve plates to realize the physical and chemical mixed reaction reduction; the separation zone is filled with horizontal pipes to enhance the separation effect of floc particles and water; the front-end biochemical denitrification system of this system is organically combined with the back-end physical and chemical phosphorus removal system to improve the sewage purification efficiency.

[0018] 2. The utility model forms a multifunctional cleaning device for the disc aerator in the system through the semi-open sleeve, movable ring, hollow cleaning curved rod, hollow brush strip, branch air pipe, pneumatic rotary plate, movable sealing component and T-shaped guide frame. For the disc aerator in long-term operation of the system, the pneumatic rotary plate, movable ring and semi-open sleeve receive the kinetic energy of the airflow of the fan in the system, and then drive the hollow cleaning curved rod and hollow brush strip to automatically clean, automatically flush and pneumatically clean the top of the disc aerator, thereby ensuring long-term and efficient operation of the disc aerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a top view schematic diagram of the structure of the utility model;

[0021] Figure 3 It is an enlarged schematic diagram of the disc aerator of the utility model structure;

[0022] Figure 4 It is a top view schematic diagram of the hollow cleaning curved rod of the utility model structure;

[0023] Figure 5 It is a partial cross-sectional schematic diagram of the semi-open sleeve of the utility model structure;

[0024] Figure 6 It is a top view schematic diagram of the pneumatic rotating plate of the utility model structure;

[0025] Figure 7 It is a partial cross-sectional schematic diagram of the hollow cleaning curved rod of the utility model structure;

[0026] Figure 8 The utility model structure Figure 5 A magnified schematic diagram of center A.

[0027] In the figure: 1. Denitrification zone; 2. Nitrification zone; 3. Sludge separation zone; 4. Phosphorus removal zone; 5. Flocculation zone; 6. Water distribution zone; 7. Separation zone; 8. Clean water zone; 9. Sieve plate; 10. Horizontal pipe filler; 11. Rope-type filler; 12. Flow pusher; 13. Reflux pump; 14. Fan; 15. Disc aerator; 16. Separation plate; 17. Inlet pipe; 18. Outlet pipe; 19. Phosphorus removal agent system; 20. Flocculation agent system; 21. Semi-open sleeve; 22. Movable ring; 23. Hollow cleaning curved rod; 24. Hollow brush strip; 25. Branch air pipe; 26. Pneumatic rotary plate; 27. Movable sealing component; 28. T-type guide frame. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-5 A sludge self-reflow denitrification and phosphorus removal system comprises a denitrification zone 1, a nitrification zone 2, a sludge separation zone 3, a phosphorus removal zone 4, a flocculation zone 5, a water distribution zone 6, and a separation zone 7. The denitrification zone 1 and the nitrification zone 2 are provided with an internal reflux pipeline, a rope-type filler 11 is provided in the middle of the denitrification zone 1 and the nitrification zone 2, and a sludge self-flow channel zone is provided at the bottom of the nitrification zone 2 and the sludge separation zone 3; the phosphorus removal zone 4 and the flocculation zone 5 are provided with 9 layers of sieve plates; the separation zone 7 is provided with a horizontal pipe filler 10, a disc aerator 15 and a reflux pump 13 are provided at the bottom of the nitrification zone 2, and a fan 14 connected to the disc aerator 15 is provided outside the nitrification zone 2;

[0030] The denitrification zone 1 is connected to a water inlet pipe, the clean water zone 8 is connected to a water outlet pipe, a flow pipe is provided between the denitrification zone 1 and the nitrification zone 2, a separation plate 16 is provided at the lower part of the outer wall of the nitrification zone 2, and the lower side of the separation plate 16 and the parallel area between the bottom inclined plate of the sludge separation zone 3 are provided as a sludge self-return channel;

[0031] The phosphorus removal zone 4 is connected to a phosphorus removal agent system 19, the flocculation zone 5 is connected to a semi-open sleeve 21, the screen plate 9 is composed of a plurality of layer plates arranged alternately in the longitudinal direction, and a plurality of layer plates are provided with clearance holes, the aperture value of the clearance holes is set to 10 to 50 mm, the oblique lower part of the horizontal tube filler 10 is provided with a sludge particle sliding channel, the bottom side wall of the denitrification zone 1 is provided with a flow pusher 12, and the upper and lower parts of the rope-type filler 11 are respectively provided with a layer of movable supporting plates;

[0032] A semi-open sleeve 21 and a movable ring 22 are sleeved on the middle of the disc aerator 15. The movable ring 22 is sleeved on the outside of the semi-open sleeve 21 through a sealing ring and a bearing. A branch air delivery pipe 25 connected to the output end of the fan 14 is sleeved on the bottom of the semi-open sleeve 21. A plurality of pneumatic rotating plates 26 are installed at equal intervals on the inner wall of the movable ring 22. A hollow cleaning curved rod 23 connected to the space of the movable ring 22 is connected to one side of the top of the movable ring 22. One end of the hollow cleaning curved rod 23 extends along the top structural contour of the horizontal pipe filler 10 until the end of the hollow cleaning curved rod 23 is connected to the center axis of the horizontal pipe filler 10. The semi-open sleeve 21 is aligned with the line, and the surface of one end of the hollow cleaning curved rod 23 is connected with a plurality of hollow brush strips 24 facing the top surface of the disc aerator 15. An inverted conical hole is provided at the top of the semi-open sleeve 21, and a movable sealing component 27 is movably sleeved at the bottom of the inverted conical hole. The movable sealing component 27 is composed of an inverted T-block and a return spring installed between the bottom of the inverted T-block and the inner wall of the top of the semi-open sleeve 21. A guide hole aligned with the conical hole is provided on the inner side of the middle part of the inverted T-block, and a T-shaped guide frame 28 is clamped in the guide hole. A support frame is installed between the surface of the top of the T-shaped guide frame 28 and the top surface of the semi-open sleeve 21.

[0033] Working principle:

[0034] Embodiment 1

[0035] Domestic sewage first enters the denitrification zone 1 through the water inlet pipe 17. Under the action of the flow pusher 12, the sewage fully contacts the denitrification zone 1 and the rope-type filler 11 to complete the denitrification reaction; then it enters the nitrification zone 2 and the rope-type filler 11 through the flow pipe. At the same time, the fan 14 allows air to pass through the disc aerator 15 into the nitrification zone 2 and the rope-type filler 11. The sewage completes the aerobic nitrification reaction. The reflux pump 13 refluxes the mixed liquid of the nitrification zone 2 to the denitrification zone 1 through the internal reflux;

[0036] Then the mixed liquid enters the sludge separation zone 3 through the sludge return channel, the mud and water are completely separated, the sludge part returns to the nitrification zone 2 through the sludge return channel, and the clean water part enters the phosphorus removal zone 4 through the sludge separation zone 3 sump. At the same time, the flocculation agent system 20 puts the phosphorus removal agent into the phosphorus removal zone 4, the sewage and the phosphorus removal agent flow downward through the sieve plate 9, and flow into the flocculation zone 5 after being evenly mixed. The flocculation agent system 20 puts the flocculation agent, and the sewage and the flocculation agent flow upward through the sieve plate 9 to form flocculent particles; the mud and water mixture is then evenly distributed through the water distribution area 6 and enters the separation zone 7 in a horizontal flow manner. When the mud and water mixture flows through the horizontal pipe filler 10, the particles slide down through the oblique downward channel of the horizontal pipe filler to the mud bucket area at the bottom of the separation zone 7. After separation, the clean water is discharged from the outlet pipe 18 through the clean water zone 8.

[0037] Embodiment 2

[0038] During the treatment of domestic sewage by the denitrification and dephosphorization system, for the disc aerator 15 used for a long time, the fan 14 can be used to continuously deliver air to the inside of the movable ring 22 through the branch air pipe 25, and then the airflow is used to impact the several pneumatic swirl plates 26, so that the several pneumatic swirl plates 26 drive the semi-open sleeve 21 to rotate under the support of the movable ring 22, and then the hollow cleaning curved rod 23 and the several hollow brush strips 24 automatically scrape and clean the impurities attached to the top of the disc aerator 15 under the synchronous transmission of the movable ring 22;

[0039] At the same time, due to the arrangement of the movable sealing component 27 and the T-shaped guide frame 28, when the fan 14 delivers air to the inside of the movable ring 22 through the branch air delivery pipe 25, as the air pressure continues to increase, the inverted T-shaped block inside the movable sealing component 27 will move up to close the inverted cone hole, and the liquid in the combined space of the movable ring 22 and the semi-open sleeve 21 will impact the surface of the disc aerator 15 through the hollow cleaning curved rod 23 and the hollow brush strip 24, and automatically wash the impurities attached to the top of the disc aerator 15;

[0040] After the liquid in the combined space of the movable ring 22 and the semi-open sleeve 21 is transported, the air that continues to be transported will impact the surface of the disc aerator 15 through the hollow cleaning curved rod 23 and the hollow brush bar 24, and pneumatically impact the impurities attached to the top of the disc aerator 15 to achieve further cleaning effect.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. At the same time, in the drawings of the present utility model, the fill pattern is only for distinguishing the layers, without any other limitation.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sludge self-recirculation denitrification and phosphorus removal system, comprising a denitrification zone (1), a nitrification zone (2), a sludge separation zone (3), a phosphorus removal zone (4), a flocculation zone (5), a water distribution zone (6), and a separation zone (7), characterized in that: The denitrification zone (1) and the nitrification zone (2) are provided with internal reflux pipelines, and rope-type fillers (11) are provided in the middle of the denitrification zone (1) and the nitrification zone (2); A sludge self-flow channel area is provided at the lower part of the nitrification area (2) and the sludge separation area (3); a sieve plate (9) layer is provided in the phosphorus removal area (4) and the flocculation area (5); and a horizontal tube filler (10) is provided in the separation area (7); A disc aerator (15) and a reflux pump (13) are arranged at the bottom of the nitrification zone (2), and a fan (14) connected to the disc aerator (15) is arranged outside the nitrification zone (2).

2. A sludge self-recirculation denitrification and phosphorus removal system according to claim 1, characterized in that: The denitrification zone (1) is externally connected to a water inlet pipe, a flow pipe is provided between the denitrification zone (1) and the nitrification zone (2), a separation plate (16) is provided at the lower portion of the outer wall of the nitrification zone (2), and a parallel area between the lower side of the separation plate (16) and the bottom inclined plate of the sludge separation zone (3) is provided as a sludge self-return channel.

3. A sludge self-recirculation denitrification and phosphorus removal system according to claim 1, characterized in that: The phosphorus removal zone (4) is connected to a phosphorus removal agent system (19), and the flocculation zone (5) is connected to a semi-open sleeve (21).

4. A sludge self-recirculation denitrification and phosphorus removal system according to claim 1, characterized in that: The sieve plate (9) is composed of a plurality of layer plates arranged alternately in a longitudinal direction, and a plurality of the layer plates are provided with clearance holes, wherein the aperture value of the clearance holes is set to be 10 to 50 millimeters.

5. The sludge self-recirculation denitrification and phosphorus removal system according to claim 1 is characterized by: The oblique lower portion of the horizontal tube filler (10) is provided with a sludge particle sliding channel.

6. The sludge self-recirculation denitrification and phosphorus removal system according to claim 1 is characterized by: A flow promoter (12) is provided on the bottom side wall of the denitrification zone (1), and a layer of movable supporting plates is provided on the upper and lower parts of the rope-shaped filler (11).

7. The sludge self-recirculation denitrification and phosphorus removal system according to claim 1 is characterized by: The disc aerator (15) is sleeved with a semi-open sleeve (21) and a movable ring (22) on the outside of the middle part. The movable ring (22) is sleeved on the outside of the semi-open sleeve (21) through a sealing ring and a bearing. The bottom of the semi-open sleeve (21) is sleeved with a branch air delivery pipe (25) connected to the output end of the fan (14). A plurality of pneumatic rotating plates (26) are equidistantly installed on the inner wall of the movable ring (22). A hollow cleaning curved rod (23) communicating with the movable ring (22) is connected to one side of the top of the movable ring (22). One end of the hollow cleaning curved rod (23) extends along the top structural contour of the horizontal tube filler (10) until the end of the hollow cleaning curved rod (23) is aligned with the central axis of the horizontal tube filler (10). The surface of one end of the hollow cleaning curved rod (23) is connected to a plurality of hollow brush strips (24) facing the top surface of the disc aerator (15).

8. A sludge self-recirculation denitrification and phosphorus removal system according to claim 7, characterized in that: An inverted conical hole is formed at the top of the semi-open sleeve (21), and a movable sealing component (27) is movably sleeved at the bottom of the inverted conical hole. The movable sealing component (27) is composed of an inverted T-shaped block and a return spring installed between the bottom of the inverted T-shaped block and the inner wall of the top of the semi-open sleeve (21).

9. A sludge self-recirculation denitrification and phosphorus removal system according to claim 8, characterized in that: A guide hole aligned with the tapered hole is provided on the inner side of the middle of the inverted T-shaped block, a T-shaped guide frame (28) is clamped in the guide hole, and a support frame is installed between the top surface of the T-shaped guide frame (28) and the top surface of the semi-open sleeve (21).

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