Encrypted preparation device for aerobic granular sludge and sewage treatment system

Abstract

The utility model relates to the technical field of sewage treatment, and provides an aerobic granular sludge densification preparation device and a sewage treatment system.The aerobic granular sludge densification preparation device comprises a body, a sludge inlet pipe and a sludge outlet pipe, an inlet of the anoxic zone is suitable for being communicated with an external sewage source; the baffling reaction area is provided with a plurality of first channels and second channels which are connected; an inlet of the aerobic zone is communicated with an outlet of the baffling reaction zone, and an outlet of the aerobic zone is communicated with an outlet of the anoxic zone. According to the aerobic granular sludge densification preparation device, aerobic granular sludge can be generated, compared with flocculent sludge, the granular sludge has good settleability, and the increase of the cost of post-stage precipitation separation is avoided. Moreover, the biomass of the granular sludge is increased, and the granular sludge is rich in variety, so that the treatment load can be improved under the same aeration rate. In addition, technical improvement and upgrading can be achieved under the condition that existing technological conditions are not affected, and the risk of production halt construction or operation with water is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an aerobic granular sludge encryption preparation device and a sewage treatment system. Background Art

[0002] When upgrading the aerobic sewage treatment process in situ, the main method is to use a moving bed biofilm or add a carrier to increase the biomass, thereby improving the sewage treatment efficiency. However, both methods have their own shortcomings. The former requires a large investment and requires underwater operations or shutdown operations, which affects the operation of the original system; the latter will increase the amount of flocculent sludge, resulting in an increase in the cost of subsequent sedimentation separation and sludge dewatering. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is that the traditional in-situ technical improvement method of aerobic sewage treatment process requires a large investment and underwater operations or production suspension operations, which affects the operation of the original system; or it will cause the amount of flocculent sludge to increase, resulting in an increase in the cost of subsequent sedimentation separation and sludge dewatering, thereby providing an aerobic granular sludge encryption preparation device and a sewage treatment system.

[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0005] On the one hand, the utility model provides an aerobic granular sludge densification preparation device, comprising: a body; an anoxic zone, which is arranged in the body, and the inlet of the anoxic zone is suitable for being connected to an external sewage source; a baffled reaction zone, which is arranged in the body and has a plurality of connected first channels and second channels; the inlet of the baffled reaction zone is connected to the outlet of the anoxic zone; an aerobic zone, which is arranged in the body, the inlet of the aerobic zone is connected to the outlet of the baffled reaction zone, and the outlet of the aerobic zone is connected to the outlet of the anoxic zone; wherein, after encountering pollutants in the anoxic zone, the microorganisms in the aerobic zone reproduce and grow and generate aggregated bacterial flocs, and after the bacterial flocs enter the baffled reaction zone, they gather and grow in the first channel, are compressed and polymerized in the second channel, and finally are converted into granular sludge in the aerobic zone, and the sludge particles can be discharged to the anoxic section of the sewage aerobic treatment process through the outlet of the body; an emptying pipe, one end of which is connected to the baffled reaction zone and the other end extends to the outside of the body.

[0006] Furthermore, the second channel is divided into a primary compression polymerization channel and a secondary compression polymerization channel, and the first channel is located between the primary compression polymerization channel and the secondary compression polymerization channel; the primary compression polymerization channel is connected to the outlets of the anoxic zone and the aerobic zone, and the secondary compression polymerization channel is connected to the entrance of the aerobic zone.

[0007] Furthermore, the aerobic granular sludge densification preparation device also includes an anoxic mixing zone, which is arranged in the main body, and the first inlet of the anoxic mixing zone is connected to the outlet of the aerobic zone, the second inlet of the anoxic mixing zone is connected to the anoxic zone, and the outlet of the anoxic mixing zone is connected to the inlet of the baffled reaction zone; the water body of the aerobic zone and part of the water body of the anoxic zone are mixed in the anoxic mixing zone, and the water body after the primary mixing is mixed with the remaining water body of the anoxic zone for a secondary mixing before entering the baffled reaction zone.

[0008] Furthermore, a nozzle, a primary throat and a secondary throat are provided in the anoxic zone; one end of the nozzle is suitable for being connected to an external sewage source, and the other end extends into the primary throat; one end of the primary throat away from the nozzle extends into the secondary throat, and the water sprayed from the nozzle enters the secondary throat after being accelerated by the primary throat, and is released into the anoxic zone after being accelerated by the secondary throat; a first water return port is provided between the primary throat and the primary compression and polymerization channel, and part of the water in the primary compression and polymerization channel flows back into the primary throat through the first water return port; a second water return port is provided between the secondary throat and the baffled reaction zone, and part of the water after the secondary mixing flows back into the secondary throat.

[0009] Furthermore, the aerobic granular sludge densification preparation device also includes a reflux pipe, one end of which is connected to the first channel and / or the second channel, and the other end of which is connected to the primary throat.

[0010] Furthermore, an aeration device is provided in the aerobic zone, including: an aerator, which is arranged at the bottom of the aerobic zone; a premixing hood, which is arranged at the air outlet end of the aerator, and the space between the premixing hood and the aerator forms a first premixing zone; a gap is left between the premixing hood and the aerator to form a third water return port, and the third water return port connects the first premixing zone with the space outside the first premixing zone; wherein the flow area of ​​the release port of the premixing hood is smaller than the flow area of ​​the water inlet of the premixing hood, so as to increase the pressure in the first premixing zone under the aeration state.

[0011] Furthermore, the aeration device also includes a fairing, which is arranged at the release port of the premixing hood, and the end of the fairing away from the premixing hood is a sealing structure, and the inner diameter of the fairing gradually decreases in the direction away from the premixing hood; the space between the fairing and the premixing hood forms a second premixing zone; a gap is left between the fairing and the premixing hood to form a diversion port, and the diversion port connects the second premixing zone with the space outside the second premixing zone.

[0012] Furthermore, a plurality of tooth-shaped openings are arranged at the edge of the fairing opening, and the plurality of tooth-shaped openings are distributed along the circumference of the fairing.

[0013] Furthermore, the aeration device further comprises a speed-retaining member, which is arranged between the premixing hood and the fairing, and one end of the speed-retaining member away from the fairing is connected to a release port of the premixing hood.

[0014] Furthermore, the aerobic granular sludge densification preparation device also includes a water outlet pipe, one end of which is connected to the aerobic zone, and the other end is suitable for being connected to the anoxic section of the sewage aerobic treatment process.

[0015] On the other hand, the utility model provides a sewage treatment system, comprising any one of the above-mentioned aerobic granular sludge densification preparation devices.

[0016] Furthermore, the sewage treatment system adopts the AAO process; the sewage source of the aerobic granular sludge densification preparation device is a mixture of the sewage raw water in the AAO process and the water in the secondary sedimentation tank; the outlet pipe in the aerobic granular sludge densification preparation device is connected to the anoxic section in the AAO process.

[0017] Furthermore, the sewage treatment system adopts the MBR process; the sewage source of the aerobic granular sludge densification preparation device is a mixture of the sewage raw water in the MBR process and the terminal sludge in the MBR pool; the outlet pipe in the aerobic granular sludge densification preparation device is connected to the anoxic section in the MBR process.

[0018] Furthermore, the sewage treatment system adopts an oxidation ditch process; the sewage source of the aerobic granular sludge densification preparation device is a mixture of sewage raw water in the oxidation ditch process and water in the secondary sedimentation tank; the outlet pipe in the aerobic granular sludge densification preparation device is connected to the anoxic section in the oxidation ditch process.

[0019] Furthermore, the sewage treatment system also includes a sludge concentrating and screening device, which is arranged upstream of the aerobic granular sludge densification preparation device. The sludge returned from the sewage treatment system first enters the sludge concentrating and screening device for sludge concentration, and the concentrated sludge is mixed with raw water and then enters the aerobic granular sludge densification preparation device.

[0020] The technical solution of the utility model has the following advantages:

[0021] The aerobic granular sludge encryption preparation device provided by the utility model can generate aerobic granular sludge. Compared with flocculent sludge, the granular sludge has good sedimentation properties, avoiding the cost of sedimentation and separation in the later stage. Moreover, when the aerobic granular sludge is used for efficiency enhancement, the biomass and biological species inside the granular sludge are richer than those of flocculent sludge. It contains anaerobic and anoxic bacteria with low oxygen demand, which can increase the processing load under the same aeration volume. Moreover, for the sewage treatment system using the aerobic granular sludge encryption preparation device, it is only necessary to conduct external lateral drainage to the aerobic granular sludge encryption preparation device, and then return it to the system. It can achieve technical improvement and upgrading without affecting the existing process conditions, avoiding the risk of stopping production and construction, or operating with water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of an aerobic granular sludge encryption preparation device in one embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of an aerobic granular sludge encryption preparation device in another embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the connection relationship between the collecting pipe and the effluent branch pipe in the aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0026] Figure 4 It is a schematic diagram of a sewage treatment system in one embodiment of the utility model;

[0027] Figure 5 is a schematic diagram of a sewage treatment system in yet another embodiment of the present utility model;

[0028] Figure 6 is a schematic diagram of a sewage treatment system in yet another embodiment of the present utility model;

[0029] Figure 7 It is a schematic diagram of an aeration device in an aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0030] Figure 8 It is a schematic diagram of an aeration device in an aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0031] Fig. 9 It is a schematic diagram of an aeration device in an aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0032] Fig.10 It is a schematic diagram of an aeration device in an aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0033] Fig.11 It is a schematic diagram of an aeration device in an aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0034] Fig.12 It is a schematic diagram of an aeration device in an aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0035] Fig.13 It is a schematic diagram of an aeration device in an aerobic granular sludge densification preparation device in one embodiment of the utility model;

[0036] Fig.14 It is a schematic diagram of a strip-shaped arrangement of aerators in an aerobic granular sludge density preparation device in one embodiment of the utility model;

[0037] Fig.15 It is a schematic diagram of aeration devices in an aerobic granular sludge density preparation device in one embodiment of the utility model when the aerators are arranged in a dotted manner;

[0038] Fig.16 It is a schematic diagram of a collection pipe in an aerobic granular sludge encryption preparation device in one embodiment of the utility model;

[0039] Fig.17 This is a schematic diagram of a sewage treatment system in yet another embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1. Main body; 2. Anoxic zone; 3. Baffle reaction zone; 4. Aerobic zone; 5. Primary compression polymerization channel; 6. First channel; 7. Secondary compression polymerization channel; 8. Anoxic mixing zone; 9. First inlet; 10. Second inlet; 11. Spray pipe; 12. Water inlet pipe; 13. Primary throat pipe; 14. Secondary throat pipe; 15. First water return port; 16. Second water return port; 17. Return pipe; 18. Water outlet pipe; 19. Drain pipe; 20. Water outlet branch pipe; 21. Aerobic pool; 22. Secondary Sedimentation tank; 23. MBR tank; 24. Oxidation ditch; 25. Aeration device; 26. Aerator; 27. Premixing hood; 28. First premixing zone; 29. ​​Third water return port; 30. Fairing; 31. Second premixing zone; 32. Fourth water return port; 33. Speed-retaining part; 34. Baffle; 35. Toothed mouth; 36. Outer cylinder; 37. Third-stage throat; 38. Collection pipe; 39. Water collecting hopper; 40. Water outlet trough; 41. Pocket plate; 42. Mud collecting cavity; 43. Sludge concentration and screening device. DETAILED DESCRIPTION

[0042] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] like Figure 1 As shown, this embodiment provides an aerobic granular sludge densification preparation device, including: a body 1; an anoxic zone 2, which is arranged in the body 1, and the inlet of the anoxic zone 2 is suitable for being connected to an external sewage source; a baffle reaction zone 3, which is arranged in the body 1 and has a plurality of connected first channels 6 and second channels; the inlet of the baffle reaction zone 3 is connected to the outlet of the anoxic zone 2; an aerobic zone 4, which is arranged in the body 1, the inlet of the aerobic zone 4 is connected to the outlet of the baffle reaction zone 3, and the outlet of the aerobic zone 4 is connected to the outlet of the anoxic zone 2. Specifically, the body 1 can be a vertical round tank or a square tank structure, the inner ring area in the center can be set as the anoxic zone 2, the outermost area can be set as the aerobic zone 4, the baffle reaction zone 3 can be between the anoxic zone 2 and the aerobic zone 4, and the baffle reaction zone 3 can be set in the lower half of the body 1. Among them, the formation of each functional zone can be achieved by setting a partition plate in the body 1, and the shape and size of each functional zone can be designed according to actual needs. When in use, the external sewage source first enters the anoxic zone 2, then flows to the baffle reaction zone 3, and then enters the aerobic zone 4. Among them, since the outlet of the aerobic zone 4 is connected to the outlet of the anoxic zone 2, part of the water body of the aerobic zone 4 can intersect with the water body of the anoxic zone 2, and then the intersecting water body enters the baffle reaction zone 3 again, so as to circulate. Among them, the microorganisms in the aerobic zone 4 encounter the pollutants in the anoxic zone 2, reproduce and grow, and generate agglomerated bacterial flocs. After the bacterial flocs enter the baffle reaction zone 3, they gather and grow in the first channel 6, are compressed and polymerized in the second channel, and finally are transformed into granular sludge in the aerobic zone 4. For example, the outlet of the main body 1 can be set in the aerobic zone 4, and the sludge particles can be discharged to the anoxic section of the sewage aerobic treatment process through the outlet of the main body 1.

[0047] The aerobic granular sludge encryption preparation device provided in this embodiment can generate aerobic granular sludge. Compared with flocculent sludge, the granular sludge has good sedimentation properties, avoiding the cost of sedimentation and separation in the later stage. Moreover, when the aerobic granular sludge is used for efficiency enhancement, the biomass and biological species inside the granular sludge are richer than those of flocculent sludge. It contains anaerobic and anoxic bacteria with low oxygen demand, which can increase the processing load under the same aeration volume. Moreover, for the sewage treatment system using the aerobic granular sludge encryption preparation device, it is only necessary to conduct external lateral drainage to the aerobic granular sludge encryption preparation device, and then return it to the system. It can achieve technical transformation and upgrading without affecting the existing process conditions, avoid the risk of stopping production and construction, or operating with water, and have no impact on the original system.

[0048] Among them, the number of the first channel 6 and the second channel can be multiple to increase the number of deflections and the extension. For example, when there is a first channel 6 and a second channel, the second channel is divided into a primary compression polymerization channel 5 and a secondary compression polymerization channel 7, and the first channel 6 is located between the primary compression polymerization channel 5 and the secondary compression polymerization channel 7; the primary compression polymerization channel 5 is connected to the outlets of the anoxic zone 2 and the aerobic zone 4, and the secondary compression polymerization channel 7 is connected to the entrance of the aerobic zone 4. In this way, through the return of the upstream and downstream of the deflection reaction zone 3, the mucus secreted by the microorganisms between the bacterial flocs is further gathered and enlarged, and the microorganisms outside the bacterial flocs further multiply and grow, and are wrapped on the original bacterial flocs. Among them, the rising process of the bacterial flocs is the tumbling and enlargement of the sphere, and the descending process of the bacterial flocs is the compression and polymerization process of the group.

[0049] The aerobic granular sludge densification preparation device further includes an anoxic mixing zone 8, which is arranged in the body 1, and the first inlet 9 of the anoxic mixing zone 8 is connected to the outlet of the aerobic zone 4, the second inlet 10 of the anoxic mixing zone 8 is connected to the anoxic zone 2, and the outlet of the anoxic mixing zone 8 is connected to the inlet of the baffle reaction zone 3; the water body of the aerobic zone 4 and part of the water body of the anoxic zone 2 are mixed in the anoxic mixing zone 8, and the water body after the primary mixing is mixed with the remaining water body of the anoxic zone 2 and then enters the baffle reaction zone 3. For example, the anoxic mixing zone 8 can be located between the anoxic zone 2 and the aerobic zone 4, and the anoxic mixing zone 8 is located in the upper half of the body 1. For example, the first inlet 9 of the anoxic mixing zone 8 is adapted to the outlet position of the aerobic zone 4, and both are located near the top of the body 1, and the water body in the aerobic zone 4 flows upward to the top of the body 1 and then crosses inward to the anoxic mixing zone 8. For example, the second inlet 10 of the anoxic mixing zone 8 may also be located near the top of the main body 1, and the water gathered at the top of the anoxic zone 2 may flow outward or penetrate into the anoxic mixing zone 8 through the hole. In this way, the microorganisms in the aerobic zone 4 and the pollutants in the anoxic zone 2 may be mixed at the upstream position of the anoxic mixing zone 8, and a cluster of bacterial flocs may be generated in advance. During the movement of the bacterial flocs downstream in the anoxic mixing zone 8, the microorganisms obtain more nutrients (pollutants), and they may multiply and grow rapidly. The bacterial flocs begin to gather and form a cluster, laying a good foundation for entering the baffle reaction zone 3.

[0050] Among them, a nozzle 11, a first-level throat 13 and a second-level throat 14 are arranged in the anoxic zone 2; one end of the nozzle 11 can be connected to an external sewage source through a water inlet pipe 12, and the other end extends into the first-level throat 13; the end of the first-level throat 13 away from the nozzle 11 extends into the second-level throat 14, and the water sprayed from the nozzle 11 enters the second-level throat 14 after being accelerated by the first-level throat 13, and is released into the anoxic zone 2 after being accelerated by the second-level throat 14; a first water return port 15 is arranged between the first-level throat 13 and the first-level compression polymerization channel 5, and part of the water in the first-level compression polymerization channel 5 flows back to the first-level throat 13 through the first water return port 15; a second water return port 16 is arranged between the second-level throat 14 and the baffle reaction zone 3, and part of the water after the secondary mixing flows back to the second-level throat 14. Such arrangement can realize the reflux of water in the baffled reaction zone 3 to the anoxic zone 2, and the reflux of water in the anoxic mixing zone 8 and the anoxic zone 2 to the anoxic zone 2, thereby increasing the extension of the waterway, improving the mixing effect, and promoting the production of microorganisms, thereby ultimately generating higher quality aerobic granular sludge.

[0051] like Figure 2 As shown, a reduced diameter section may be provided in the middle of the secondary throat 14 to accelerate the water body.

[0052] Among them, the aerobic granular sludge densification preparation device also includes a reflux pipe 17, one end of which is connected to the first channel and / or the second channel, and the other end is connected to the first throat pipe 13. For example, the reflux pipe can be connected to the first compression polymerization channel 5, the first channel 6 and the second compression polymerization channel 7 at the same time, or it can be connected to any one of them. Such a setting can play a reflux role. After the reflux, the amount of water in the anoxic zone increases, and the rising flow rate of the water body increases, which is beneficial to the suspension state of the sludge. The suspension contact area is large, which is conducive to the attraction between the sludges; on the other hand, the reflux can increase the probability of the sludges gathering together.

[0053] like Figure 7 , Fig.14 as well as Fig.15As shown, an aeration device 25 is provided in the aerobic zone 4, including: an aerator 26, which is used to be arranged in the aerobic zone 4 that needs aeration; wherein, a plurality of aerators 26 can be provided, and the aerators 26 can be arranged in a point-like manner in the aerobic zone 4, for example, a plurality of aerators 26 arranged in a point-like manner can be arranged in a ring. The aerators 26 can also be arranged in a strip-like manner in the aerobic zone 4, for example, a plurality of aerators 26 can be arranged in an array in rows or columns. The arrangement of the aerators 26 is not limited to the above two methods, and the actual arrangement of the aerators 26 can be designed as needed. The premixing hood 27 is arranged at the outlet end of the aerator 26, and the space between the premixing hood 27 and the aerator 26 forms the first premixing zone 28; a gap is left between the premixing hood 27 and the aerator 26 to form the third water return port 29, and the third water return port 29 connects the first premixing zone 28 with the space outside the first premixing zone 28; wherein, the flow area of ​​the release port of the premixing hood 27 is smaller than the flow area of ​​the water inlet of the premixing hood 27, so as to increase the pressure in the first premixing zone 28 under the aeration state. For example, the premixing hood 27 can be a truncated cone structure, with both ends open, the large end at the bottom, the small end at the top, and the small end used as a release port. For another example, the premixing hood 27 can also be a prism-shaped structure, with both ends open, the large end at the bottom, the small end at the top, and the small end used as a release port. wherein, the premixing hood 27 can be welded to the side wall of the aerobic zone 4 by setting a connecting rod on the side wall.

[0054] In this way, the aerator 26 releases air in the first premixing zone 28. Due to the rapid rise of bubbles, the water outside the first premixing zone 28 will be driven to enter the first premixing zone 28 through the third water return port 29. In addition, the release port just above the premixing cover 27 is reduced in diameter, so that the pressure in the first premixing zone 28 rises, so that the bubbles are further mixed with the water flowing back through the third water return port 29, and the mixing effect will be better due to the increase in pressure. The mixed gas-water mixture is ejected through the release port and rises to the aerobic zone 4 outside the first premixing zone 28. In this way, when the aeration device 25 is used, the concentration of dissolved oxygen is increased by reflux, mixing and pressurizing dissolved gas, and the efficiency is higher and more energy-saving under the same aeration conditions. Moreover, the setting of the aeration device 25 makes the bacterial flocs in the aerobic zone 4 further scrubbed and encrypted by hydraulic force, so that the bacterial flocs are changed from solid masses to spherical particles. In this process, the pollutants are further consumed and exhausted at the top of the aerobic zone 4, and the microorganisms enter the starvation period cycle again.

[0055] like Figure 8As shown, the aeration device 25 further includes a fairing 30, which is arranged at the release port of the premixing hood 27, and the end of the fairing 30 away from the premixing hood 27 is a sealing structure, and the inner diameter of the fairing 30 gradually decreases in the direction away from the premixing hood 27; the space between the fairing 30 and the premixing hood 27 forms a second premixing zone 31; a gap is left between the fairing 30 and the premixing hood 27 to form a diversion port, and the diversion port connects the second premixing zone 31 with the space outside the second premixing zone 31. Wherein, the fairing 30 can be welded to the side wall of the aerobic zone 4 by arranging a connecting rod on the side wall. For example, the fairing 30 can be a conical structure with the top of the cone on the top. For another example, the premixing hood 27 can also be a prismatic structure with a smaller top surface on the top. Wherein, the shape of the fairing 30 is adapted to the shape of the premixing hood 27. For example, when the premixing hood 27 is a truncated cone structure, the fairing 30 can be a conical structure. For example, when the premixing cover 27 is a prism-shaped structure, the fairing 30 can be a prismatic structure. When in use, the gas-water mixture in the first premixing zone 28 enters the second premixing zone 31 through the release port of the premixing cover 27, and the gas-water mixture in the second premixing zone 31 flows out through the diversion port and is divided into a first branch and a second branch. The gas-water mixture in the first branch moves toward the direction of the third water return port 29, thereby forming a cycle, and the gas-water mixture in the second branch flows over the fairing 30 toward the downstream. Moreover, since the side wall of the fairing 30 is an inclined surface, a slope can be formed, and a part of the gas-water mixture will slide down along the slope and counteract and mix with the gas-water mixture that rises rapidly in the second branch, thereby improving the mixing effect.

[0056] like Fig.15 As shown, a plurality of tooth-shaped openings 35 may be provided at the edge of the fairing 30, and the plurality of tooth-shaped openings 35 are distributed along the circumference of the fairing 30. In this way, the mixing effect can be increased through the tooth-shaped openings 35, because the flow velocities through the concave area and the convex area of ​​the tooth-shaped openings 35 are different, which can increase the disturbance mixing effect. In addition, the gas-water mixed liquid is provided with a horizontal and downward reflux diversion momentum, which can further increase the mixing effect, and the downward diversion of the gas-water mixed liquid will increase the extension of the mixing, prolong the effective contact time, and will not directly rise to the liquid surface.

[0057] like Fig. 9As shown, in one embodiment, the aeration device 25 further includes a speed-retaining member 33, which is disposed between the premixing hood 27 and the fairing 30, and the end of the speed-retaining member 33 away from the fairing 30 is connected to the release port of the premixing hood 27. For example, when the premixing hood 27 is a truncated cone structure, the speed-retaining member 33 may be a round tube. When the premixing hood 27 is a prism-shaped structure, the speed-retaining member 33 may be a square tube, so as to match the shape of the premixing hood 27. When in use, the gas-water mixture flowing out of the release port of the premixing hood 27 may enter the speed-retaining member 33, and the speed of the gas-water mixture in the speed-retaining member 33 changes little, and a high flow rate may be maintained, and then the gas-water mixture is released from the top outlet of the speed-retaining member 33 to the second premixing zone 31. In this way, a section of the speed-retaining member 33 is added to the release port of the premixing hood 27, and this straight speed-retaining member 33 may keep the drainage force of the first premixing zone 28 relatively large. Because the speed-retaining member 33 increases the release port height of the premixing hood 27, the velocity of the gas-water mixture outside the premixing hood 27 is relatively low, and the velocity difference with the gas-water mixture in the first premixing zone 28 is relatively large, so the pressure difference is large. Compared with the case without the speed-retaining member 33, the velocity difference between the two is greater, so the gravitational force is better.

[0058] like Fig.10 As shown, the aeration device 25 further includes a baffle 34, which is arranged inside the fairing 30, and the plate surface of the baffle 34 is arranged opposite to the outlet of the speed-retaining member 33. When in use, the gas-water mixture released from the outlet at the top of the speed-retaining member 33 hits the baffle 34 and then diffuses to the surroundings. Such a setting can prevent the accumulation of air bubbles on the top of the fairing 30, so that the gas is smoothly released into the water, improve the gas-water mixing effect, and finally improve the hydraulic scrubbing and densification effect on the bacterial flocs.

[0059] like Fig.11 As shown, in another embodiment, the aeration device 25 further includes a speed-retaining member 33, which is arranged between the premixing cover 27 and the aerator 26; a gap is left between the speed-retaining member 33 and the premixing cover 27 to form a third water return port 29. Such an arrangement can accelerate the water body to enter the first premixing zone 28 through the third water return port 29. The speed-retaining member 33 can be a round tube or a square tube, which can be selected according to needs.

[0060] Among them, the aeration device 25 also includes an outer cylinder 36, which is arranged in the aerobic zone 4 that needs aeration; the aerator 26, the speed-retaining part 33 and the premixing cover 27 are all located in the outer cylinder 36, and the gas-water mixture flowing out from the release port of the premixing cover 27 flows out through the open port at the top of the outer cylinder 36; a gap is left between the bottom of the outer cylinder 36 and the aerator 26 to form a fourth water return port 32, so that the gas-water mixture outside the outer cylinder 36 enters the speed-retaining part 33 through the fourth water return port 32. Among them, the outer cylinder 36 can be a round tube or a square tube, which can be selected according to needs. Such a setting increases the number of reflux times, which is equivalent to secondary reflux mixing, which is beneficial to improving the gas-water mixing effect.

[0061] like Fig.12 , Fig.13 As shown, in another embodiment, the aeration device 25 also includes a speed-retaining component 33 and a tertiary throat 37; from top to bottom, they are the tertiary throat 37, the speed-retaining component 33, the premixing hood 27 and the aerator 26. One end of the speed-retaining component 33 is connected to the release port of the premixing hood 27, and the other end extends upward into the tertiary throat 37; the diameter of both ends of the tertiary throat 37 is larger than the diameter of the middle section of the pipe body, and a gap is left between the tertiary throat 37 and the speed-retaining component 33 to form a fourth water return port 32. When in use, the speed-retaining component 33 is used to achieve the first-level speed retention, and the tertiary throat 37 is used to achieve the second-level speed retention. This arrangement increases the number of reflux times, which is equivalent to the second-level reflux mixing, and is beneficial to improving the gas-water mixing effect. Among them, in the aeration device 25 under this embodiment, the aerator 26 is selected to be arranged in a point shape.

[0062] like Figure 3 , Fig.16 As shown, the aerobic granular sludge densification preparation device also includes a water outlet trough 40 and a water outlet pipe 18. The water outlet trough 40 can be set at the end of the aerobic zone 4. One end of the water outlet pipe 18 is connected to the water storage tank, and the other end is suitable for connecting to the anoxic section of the sewage aerobic treatment process. For example, multiple collecting pipes 38 can be set at different positions in the aerobic zone 4. The collecting pipes 38 are in an inverted V-shaped structure, and the tip of each collecting pipe 38 is used as a water outlet and connected to the water outlet branch pipe 20. The other end of the collecting pipe 38 is provided with a trumpet-shaped water collecting bucket 39, and the trumpet-shaped water collecting bucket 39 is located in the aerobic zone 4, and the inlet position is located below the liquid surface. The outlets of multiple water outlet branches 20 converge into the water outlet trough 40 to improve the uniformity of the water outlet. Moreover, since the lower part of the collecting pipe 38 is enlarged, the granular sludge can be lifted to the water outlet trough 40 by air lift, and then enter the water outlet pipe 18, so as to avoid the siphon phenomenon after shutdown causing the water level in the equipment to drop. The aerobic granular sludge densification preparation device further includes an emptying pipe 19, one end of which is connected to the baffle reaction zone 3 and the other end extends to the outside of the body 1. For example, one end of the emptying pipe 19 can be located at the bottom of the primary compression polymerization channel 5, and the water and waste sludge retained in the body 1 can be discharged.

[0063] like Fig.17As shown, in one embodiment, a scoop plate 41 is provided at the entrance of the secondary compression and polymerization channel 7, and the bottom end of the scoop plate 41 can be provided on the outer wall of the primary throat pipe 13 along the circumference of the primary throat pipe 13, and the space inside the scoop plate forms a cavity 42 for scooping mud, and there is a gap between the top of the scoop plate 41 and the bottom of the anoxic mixing zone 8, and at the same time, there is also a gap between the bottom of the scoop plate 41 and the secondary throat pipe 14. When the water in the anoxic zone 2 and the anoxic mixing zone 8 enters the cavity 42 for scooping mud, part of the water will go over the scoop plate 41 and enter the secondary compression and polymerization channel 7, and the other part of the water can flow back to the secondary throat pipe 14. In this way, the sludge can be retained in the upper part of the body, and the sludge will not fall to the lower part of the body along the secondary compression and polymerization channel after shutdown.

[0064] When in use, the sewage raw water and the return water of the secondary sedimentation tank sludge enter the body 1 from the water inlet pipe 12 according to the set ratio, firstly accelerate the reflux phenomenon through the nozzle 11, and then enter the upper secondary throat pipe 14 through the primary throat pipe 13 together with the inlet water, and then enter the anoxic zone 2. At the same time, the water at the top of the aerobic zone 4 also enters the anoxic mixing zone 8 together with the water distributed from the upper part of the anoxic zone 2. Afterwards, the water after the secondary mixing is mixed again in the ascending section of the secondary throat pipe 14, and the anoxic denitrification reaction is carried out. Among them, since the pollution of sewage at the top of the aerobic zone 4 is consumed by microorganisms, the microorganisms at the top are in the starvation period. There are a large number of pollutants in the influent. The microorganisms in the anoxic mixing zone 8 and the anoxic zone 2 encounter pollutants in the influent, which is equivalent to the feast period. The pollutants that meet the needs of the microorganisms, the microorganisms obtain more nutrients (pollutants), and will reproduce and grow rapidly. The bacterial flocs begin to gather and hold together, and then enter the baffle reaction zone 3. Through the return of the upper and lower streams, the mucus secreted by the microorganisms further gathers and grows between the groups, and the microorganisms outside the group further reproduce and grow, and wrap around the original bacterial group. The rising process is the rolling and enlargement of the sphere, and the descending zone is the compression and polymerization process of the group. After that, it enters the aerobic zone 4 through the air lift effect of the aeration device 25, and the diversion mixing effect, and then enters the high-speed rising section. This section is mainly to further hydraulically scrub and encrypt the previously wrapped bacterial group, and the solid group becomes a spherical particle process. In this process, the pollutants are further consumed, exhausted at the top, and enter the starvation period cycle again. The collection pipe for granular sludge and water extends below the liquid level of aerobic zone 4, and the effluent re-enters the anoxic section in the front section of aerobic zone 4 of the original tank body.

[0065] In another embodiment, a sewage treatment system is provided, comprising any one of the above-mentioned aerobic granular sludge densification preparation devices.

[0066] like Figure 4As shown, the sewage treatment system can be upgraded for the sewage treatment system using the AAO process, and the specific implementation is as follows: an aerobic tank 21 and a secondary sedimentation tank 22 are arranged along the flow path of the water body, the front section of the aerobic tank 21 is an anoxic section, and the rear section of the aerobic tank 21 is an aerobic section. The sewage source of the aerobic granular sludge densification preparation device in the anoxic tank is a mixture of the sewage raw water in the AAO process, the secondary sedimentation tank, and the water in the rear section of the aerobic tank; the outlet pipe 18 in the aerobic granular sludge densification preparation device is connected to the anoxic section of the front section of the aerobic tank 21. Among them, the sewage treatment system using the AAO process can also be provided with a sludge concentration and screening device 43, which is located upstream of the aerobic granular sludge densification preparation device. The water in the rear section of the secondary sedimentation tank and the aerobic tank can enter the sludge concentration and screening device 43 for sludge concentration before entering the aerobic granular sludge densification preparation device. The concentrated sludge is then mixed with the sewage raw water in the AAO process and enters the aerobic granular sludge densification preparation device. With such arrangement, the sludge content in the water body after being concentrated by the sludge concentration and screening device is higher, and the concentrated sludge enters the aerobic granular sludge densification preparation device for granulation, which is beneficial to improving the efficiency of granulation.

[0067] The sludge pipes of the rear section of the aerobic tank and the secondary sedimentation tank are optional and can also be used as water intake points of the sludge concentration and screening device 43 at the same time.

[0068] like Figure 5 As shown, the sewage treatment system can be a sewage treatment system using the MBR process, and an aerobic tank 21 and an MBR tank 23 are arranged along the flow path of the water body. The front section of the aerobic tank 21 is an anoxic section, and the rear section of the aerobic tank 21 is an aerobic section; the sewage source of the aerobic granular sludge densification preparation device is a mixture of the sewage raw water in the MBR process and the water body in the MBR tank 23; the outlet pipe 18 in the aerobic granular sludge densification preparation device is connected to the anoxic section of the front section of the aerobic tank 21. Among them, the sewage treatment system using the MBR process can also be provided with a sludge concentration and screening device 43, and the sludge concentration and screening device 43 is located upstream of the aerobic granular sludge densification preparation device. Before entering the aerobic granular sludge densification preparation device, the water body in the MBR tank 23 can first enter the sludge concentration and screening device 43 for sludge concentration, and the concentrated sludge is then mixed with the sewage raw water in the MBR process and enters the aerobic granular sludge densification preparation device. With such arrangement, the sludge content in the water body after being concentrated by the sludge concentration and screening device is higher, and the concentrated sludge enters the aerobic granular sludge densification preparation device for granulation, which is beneficial to improving the efficiency of granulation.

[0069] like Figure 6As shown, the sewage treatment system can be a sewage treatment system using an oxidation ditch process, and an aerobic tank 21 and a secondary sedimentation tank 22 are arranged along the flow path of the water body. The front section of the aerobic tank 21 is an anoxic section, and the rear section of the aerobic tank 21 is an oxidation ditch 24; the sewage source of the aerobic granular sludge densification preparation device is a mixture of the sewage raw water in the oxidation ditch 24 process and the water body in the secondary sedimentation tank; the outlet pipe 18 in the aerobic granular sludge densification preparation device is connected to the anoxic section of the front section of the aerobic tank 21. Among them, the sewage treatment system using the oxidation ditch process can also be provided with a sludge concentration and screening device 43, and the sludge concentration and screening device 43 is located upstream of the aerobic granular sludge densification preparation device. The water body in the oxidation ditch 24 or the secondary sedimentation tank can enter the sludge concentration and screening device 43 for sludge concentration before entering the aerobic granular sludge densification preparation device, and the concentrated sludge is then mixed with the sewage raw water in the oxidation ditch 24 process and enters the aerobic granular sludge densification preparation device. With such arrangement, the sludge content in the water body after being concentrated by the sludge concentration and screening device is higher, and the concentrated sludge enters the aerobic granular sludge densification preparation device for granulation, which is beneficial to improving the efficiency of granulation.

[0070] The sludge pipes of the oxidation ditch and the secondary sedimentation tank are optional and can also be used as water intake points for the sludge concentration and screening device 43 at the same time.

[0071] In summary, for the sewage treatment system in this application, for the standard improvement project, the external lateral drainage is to the aerobic granular sludge densification preparation device, and then returned to the system. This can avoid the risk of stopping production for construction or carrying water, and has no impact on the original system.

[0072] The sewage treatment system in this application occupies less space and requires less investment.

[0073] In the sewage treatment system of the present application, the granular sludge can increase the treatment load after entering the original system, and the bacterial distribution of the granular sludge itself can also reduce the original aeration volume, which is more energy-efficient.

[0074] The sewage treatment system in this application has backflow, mixing, and pressurized dissolved gas, which increases the concentration of dissolved oxygen. Under the same aeration conditions, the efficiency is improved and more energy-saving.

[0075] The sewage treatment system in the present application has horizontal flow, upward flow and downward flow, which increases the extension distance, prolongs the reaction time, and increases the concentration of dissolved oxygen. Under the same aeration conditions, the efficiency is improved and more energy-saving is achieved.

[0076] The sewage treatment system in this application, under the same aeration conditions, utilizes the air lift drainage effect to make the reflux mixing work, which is more energy-efficient.

[0077] In the sewage treatment system of the present application, the rising flow rate change effect causes particle collision and better mixing effect, and aerobic particles are more easily wrapped and scrubbed.

[0078] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An aerobic granular sludge encryption preparation device, characterized in that: include: Ontology(1); An anoxic zone (2) is arranged in the body (1), and an inlet of the anoxic zone (2) is suitable for being connected to an external sewage source; A baffled reaction zone (3) is arranged in the body (1) and has a plurality of connected first channels (6) and second channels; the inlet of the baffled reaction zone (3) is connected to the outlet of the anoxic zone (2); an aerobic zone (4) disposed in the body (1), wherein the inlet of the aerobic zone (4) is connected to the outlet of the baffled reaction zone (3), and the outlet of the aerobic zone (4) is connected to the outlet of the anoxic zone (2); The microorganisms in the aerobic zone (4) reproduce and grow after encountering the pollutants in the anoxic zone (2) and generate aggregated bacterial flocs. After the bacterial flocs enter the baffled reaction zone (3), they gather and grow in the first channel (6), are compressed and aggregated in the second channel, and finally are transformed into granular sludge in the aerobic zone (4). The sludge particles can be discharged through the outlet of the main body (1) to the anoxic section of the sewage aerobic treatment process.

2. The aerobic granular sludge encryption preparation device according to claim 1, characterized in that: The second channel is divided into a primary compression polymerization channel (5) and a secondary compression polymerization channel (7), and the first channel (6) is located between the primary compression polymerization channel (5) and the secondary compression polymerization channel (7); The first-stage compression polymerization channel (5) is connected to the outlets of the anoxic zone (2) and the aerobic zone (4), and the second-stage compression polymerization channel (7) is connected to the inlet of the aerobic zone (4).

3. The aerobic granular sludge encryption preparation device according to claim 2, characterized in that: It also comprises an anoxic mixing zone (8) disposed in the body (1), a first inlet (9) of the anoxic mixing zone (8) being connected to an outlet of the aerobic zone (4), a second inlet (10) of the anoxic mixing zone (8) being connected to the anoxic zone (2), and an outlet of the anoxic mixing zone (8) being connected to an inlet of the baffled reaction zone (3); The water in the aerobic zone (4) and part of the water in the anoxic zone (2) are mixed in the anoxic mixing zone (8), and the water after the primary mixing is mixed in the secondary mixing with the remaining water in the anoxic zone (2) before entering the baffled reaction zone (3).

4. The aerobic granular sludge encryption preparation device according to claim 3, characterized in that: The anoxic zone (2) is provided with a nozzle (11), a primary throat (13) and a secondary throat (14); One end of the spray pipe (11) is suitable for being connected to an external sewage source, and the other end extends into the primary throat pipe (13); One end of the primary throat (13) away from the nozzle (11) extends into the secondary throat (14), and the water sprayed from the nozzle (11) is accelerated by the primary throat (13) and enters the secondary throat (14), and is accelerated by the secondary throat (14) and released into the anoxic zone (2); A first water return port (15) is provided between the first-stage throat pipe (13) and the first-stage compression and aggregation channel (5), and part of the water in the first-stage compression and aggregation channel (5) flows back into the first-stage throat pipe (13) through the first water return port (15); A second water return port (16) is provided between the secondary throat pipe (14) and the baffle reaction zone (3), and part of the water after the secondary mixing flows back into the secondary throat pipe (14).

5. The aerobic granular sludge encryption preparation device according to claim 4, characterized in that: It also comprises a return pipe (17), one end of which is connected to the first channel and / or the second channel, and the other end of which is connected to the primary throat pipe (13).

6. The aerobic granular sludge encryption preparation device according to claim 1, characterized in that: The aerobic zone (4) is provided with an aeration device (25), comprising: an aerator (26) disposed at the bottom of the aerobic zone (4); A premixing hood (27) is arranged at the air outlet end of the aerator (26), and the space between the premixing hood (27) and the aerator (26) forms a first premixing zone (28); a gap is left between the premixing hood (27) and the aerator (26) to form a third water return port (29), and the third water return port (29) communicates with the first premixing zone (28) and the space outside the first premixing zone (28); wherein the flow area of ​​the release port of the premixing hood (27) is smaller than the flow area of ​​the water inlet of the premixing hood (27), so as to increase the pressure in the first premixing zone (28) under the aeration state.

7. The aerobic granular sludge encryption preparation device according to claim 6, characterized in that: The aeration device (25) further comprises a fairing (30) which is arranged at the release port of the premixing cover (27); the end of the fairing (30) away from the premixing cover (27) is a sealing structure, and the inner diameter of the fairing (30) gradually decreases in a direction away from the premixing cover (27); The space between the fairing (30) and the premixing cover (27) forms a second premixing zone (31); A gap is left between the fairing (30) and the premixing cover (27) to form a flow splitter, and the flow splitter connects the second premixing zone (31) with the space outside the second premixing zone (31).

8. The aerobic granular sludge encryption preparation device according to claim 7, characterized in that: A plurality of tooth-shaped openings (35) are arranged at the edge of the fairing opening of the fairing (30), and the plurality of tooth-shaped openings (35) are distributed along the circumference of the fairing (30).

9. The aerobic granular sludge encryption preparation device according to claim 7, characterized in that: The aeration device (25) further comprises a speed-retaining member (33) which is arranged between the premixing cover (27) and the fairing (30), and one end of the speed-retaining member (33) away from the fairing (30) is connected to a release port of the premixing cover (27).

10. The aerobic granular sludge densification preparation device according to claim 1, characterized in that: It also comprises a water outlet pipe (18), one end of which is connected to the aerobic zone (4), and the other end of which is suitable for being connected to the anoxic section of the sewage aerobic treatment process.

11. A sewage treatment system, characterized in that: It comprises the aerobic granular sludge densification preparation device as described in any one of claims 1-10.

12. The sewage treatment system according to claim 11, characterized in that: The sewage treatment system adopts AAO process; The sewage source of the aerobic granular sludge densification preparation device is a mixture of the sewage raw water in the AAO process and the water in the secondary sedimentation tank; The outlet pipe (18) in the aerobic granular sludge densification preparation device is connected to the anoxic section in the AAO process.

13. The sewage treatment system according to claim 11, characterized in that: The sewage treatment system adopts MBR technology; The sewage source of the aerobic granular sludge densification preparation device is a mixture of the sewage raw water in the MBR process and the terminal sludge in the MBR tank (23); The outlet pipe (18) of the aerobic granular sludge densification preparation device is connected to the anoxic section in the MBR process.

14. The sewage treatment system according to claim 11, characterized in that: The sewage treatment system adopts an oxidation ditch (24) process; The sewage source of the aerobic granular sludge densification preparation device is a mixture of the sewage raw water in the oxidation ditch (24) process and the water in the secondary sedimentation tank; The outlet pipe (18) in the aerobic granular sludge densification preparation device is connected to the anoxic section in the oxidation ditch (24) process.

15. The sewage treatment system according to any one of claims 12 to 14, characterized in that: It also includes a sludge concentration and screening device, which is arranged upstream of the aerobic granular sludge densification preparation device. The sludge returned from the sewage treatment system first enters the sludge concentration and screening device for sludge concentration, and the concentrated sludge is mixed with raw water and then enters the aerobic granular sludge densification preparation device.

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