Micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device

Abstract

The invention discloses a micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device, which integrates two energy-saving and high-efficiency processes of pure oxygen micro-shallow aeration and granular anaerobic ammonia oxidation, and comprises a tank body and four independent grid areas which are radially divided by partition plates along a central shaft in the tank body. The first grid region is used for a pure oxygen micro-shallow aeration ammonia nitrogen nitrosation process, the second grid region is used for a micro-shallow aeration nitrosation sludge separation and reflux process, the third grid region is used for an anaerobic ammonia oxidation autotrophic nitrogen removal process, and the fourth grid region is used for a separation and reflux or discharge process of granular sludge. The ammonia nitrogen nitrosation in the first grid region adopts pure oxygen micro-shallow exposure, the transmission efficiency and the utilization rate of oxygen are optimal, the reaction tank body of the first grid region is closed, and the escaping oxygen which is not completely reacted is collected and recycled, so that the ammonia nitrogen is converted into nitrite nitrogen; in the whole process, through continuous separation and elutriation of the sludge, granulation generation of the sludge is accelerated, a sludge treatment link is omitted, and the sludge can be sold in the market to generate certain economic value.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection equipment for sewage and wastewater treatment, and in particular to a pure oxygen slightly shallow aeration autotrophic anaerobic ammonia oxidation granular sludge denitrification device. Background Art

[0002] Wastewater denitrification is a critical step in wastewater treatment. While the traditional nitrification-denitrification biological denitrification process is highly mature and currently the mainstream process for wastewater treatment, due to limitations in the process itself and influent conditions, traditional biological denitrification still suffers from drawbacks such as high aeration volumes, high energy consumption, high carbon source dosage, and low total nitrogen removal rates. These shortcomings have led to the recent development of the anaerobic ammonium oxidation (ANAMMOX) denitrification process, which more specifically addresses the issues of high energy consumption and high carbon source dosage. However, it requires a short-cut nitrification-denitrification process. This results in a lengthy process and flowsheet, a large footprint, low process integration, and the resulting sludge requiring additional disposal costs.

[0003] Therefore, it is urgent to propose a denitrification device that can not only solve the shortcomings of the above-mentioned traditional process but also avoid the shortcomings of the anaerobic ammonia oxidation denitrification process, such as long process and low integration, and has lower energy consumption and high-value conversion of residual sludge, so as to overcome the above-mentioned problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device. On the basis of combining the two processes of pure oxygen micro-shallow aeration and anaerobic ammonia oxidation for denitrification, the bottom sludge is continuously washed up and down to granulate the sludge, which not only saves the sludge treatment cost, but also forms granular sludge with high economic value, thereby solving the above-mentioned problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a shallow aeration anaerobic ammonium oxidation granular sludge denitrification device, comprising: a tank body, the interior of the tank body is radially divided into four independent compartments along the central axis by a partition, specifically:

[0007] The first cell is used for ammonia nitrogen nitritation process with pure oxygen shallow aeration, including multiple shallow aerators arranged 80 cm below the liquid surface in the first cell and a first water distribution pipe below the liquid surface, the first water distribution pipe is connected to a first water inlet pipe that runs through the outside of the side wall, and the top of the first cell is sealed;

[0008] The second cell area is used for the separation and reflow process of the slightly shallow nitrite sludge, including a sludge cyclone separator arranged below the liquid surface of the second cell area and a sludge lifting branch pipe above the liquid surface, one end of the sludge lifting branch pipe is connected to the sludge lifter in the second cell area, and the other end of the sludge lifting pipe is connected to the first water distribution pipe of the first cell area;

[0009] The third cell area is used for the anaerobic ammonium oxidation denitrification process, including an elutriator and a second water distribution pipe arranged below the liquid level of the third cell area, the second water distribution pipe is connected to a second water inlet pipe, and the second water inlet pipe extends through the partition to below the liquid level of the second cell area;

[0010] The fourth cell area is used for the separation and reflow process of anaerobic ammonium oxidation granular sludge, including a granular sludge cyclone separator arranged below the liquid surface of the fourth cell area and a granular sludge lifting branch pipe above the liquid surface, one end of the granular sludge lifting branch pipe is connected to the granular sludge lifter in the fourth cell area, and the other end of the granular sludge lifting branch pipe is connected to the second water distribution pipe of the third cell area;

[0011] A water outlet weir is provided in the fourth grid area, and the water outlet weir is provided with a water outlet pipe communicating with the outside of the tank body.

[0012] Optionally, a first and second cell zone flow guide pipe is provided between the first cell zone and the second cell zone, one end of the first and second cell zone flow guide pipe extends to the bottom of the first cell zone, and the other end of the first and second cell zone flow guide pipe is directly connected to the sludge cyclone separator;

[0013] A third and fourth grid zone flow guide pipe is provided between the third grid zone and the fourth grid zone, one end of the third and fourth grid zone flow guide pipe extends to the bottom in the third grid zone, and the other end of the third and fourth grid zone flow guide pipe is directly connected to the granular sludge cyclone separator.

[0014] Optionally, the sludge cyclone separator and the granular sludge cyclone separator have the same structure, and the granular sludge cyclone separator includes a truncated cone-shaped cylinder and a centrifugal water distribution pipe arranged in the truncated cone-shaped cylinder, and the centrifugal water distribution pipe is spirally arranged on the top inner wall of the truncated cone-shaped cylinder, and the diversion inlet pipe of the centrifugal water distribution pipe is connected to the diversion pipe of the third and fourth grid areas.

[0015] Optionally, the liquid level from the first grid area to the fourth grid area decreases by at least 30 cm successively, the top of the first and second grid area guide pipes is set between the liquid levels of the first grid area and the second grid area, and the top of the third and fourth grid area guide pipes is set between the liquid levels of the third grid area and the fourth grid area.

[0016] Optionally, the top of the first cell is sealed by a pure oxygen collection cover, the top of the pure oxygen collection cover is provided with a pure oxygen collection port, and the oxygen collected by the pure oxygen collection port is circulated and introduced into the shallow aerator;

[0017] The external pure oxygen port of the micro-shallow aerator is communicated with an external molecular sieve oxygen generator.

[0018] Optionally, the micro-shallow aerator includes a first venturi tube and a first diffusion head vertically arranged on the upper part of the first venturi tube, an external pure oxygen port is provided at the connection between the first venturi tube and the first diffusion head, and the height of the first venturi tube is at least 5 times the height of the first diffusion head.

[0019] Optionally, the scrubber includes a second venturi tube and a second diffuser head vertically arranged on the upper part of the second venturi tube, an external blower port is provided at the connection between the second venturi tube and the second diffuser head, and the height of the first diffuser head is at least 3 times the height of the first venturi tube.

[0020] Optionally, a mud collecting hopper is provided at the bottom of the tank body, and the mud collecting hopper is in an inverted cone shape, the outer side of the bottom of the first to fourth grid areas is an inclined surface, and the inner side of the bottom of the first to fourth grid areas is the lowest plane.

[0021] Optionally, the sludge lifter is arranged on the inner side of the bottom of the second cell, and the sludge cyclone separator is arranged above the inclined surface of the second cell;

[0022] The bottom of the sludge lifter in the second grid area is connected through a first bottom sludge suction pipe. One side of the sludge lifter is connected to a blower. The top of the sludge lifter protruding from the liquid surface in the vertical direction is provided with a first gas release port.

[0023] Optionally, the granular sludge lifter is arranged on the inner side of the bottom of the fourth grid area, and the granular sludge cyclone separator is arranged above the inclined surface of the fourth grid area;

[0024] The bottom of the granular sludge lifter in the fourth grid area is connected through a second bottom sludge suction pipe, one side of the granular sludge lifter is connected to a blower, and a second body release port is provided at the top of the granular sludge lifter protruding from the liquid surface in the vertical direction.

[0025] Compared with the prior art, the present invention has achieved the following technical effects:

[0026] 1. The micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device proposed in the present invention integrates two energy-saving and efficient processes: pure oxygen micro-shallow aeration and granular anaerobic ammonia oxidation. The vast majority of oxygen consumption is required in the nitrification stage, and the dissolved oxygen is generally controlled at 0.5-1.0 mg / L. The dissolved oxygen in the ammonia oxidation zone is even controlled at 0.2-0.5 mg / L. Compared with the traditional nitrification and denitrification process with a dissolved oxygen of 2.5-5.0 mg / L, the oxygen supply has been greatly reduced. In addition, the oxygen supply method is pure oxygen shallow aeration. This technology saves more than 40% energy compared with conventional air aeration.

[0027] 2. The micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device proposed in the present invention completely eliminates the use of pumps, Roots blowers, and mixers. The adopted lifters, elutriators, and cyclone separators utilize fluid dynamics to complete the mixing, disturbance, and stirring of gas and water, as well as sludge separation and reflux, thereby significantly reducing energy consumption and avoiding the maintenance and repair of various pump mechanical equipment. The oxygen that has not reacted completely in the first pure oxygen micro-shallow aeration zone is sucked away by the vortex blower and reused, thereby achieving the purpose of saving energy consumption.

[0028] 3. The shallow aeration anaerobic ammonia oxidation granular sludge denitrification device proposed in the present invention does not have any pump equipment, which avoids the sludge particles being broken by the pump. Therefore, the sludge can be granulated. The sludge has a high specific gravity, which is about 1.5 times that of traditional sludge. It is easy to collect, store and transport, and is made into granular bacteria with a water content of about 95% for sale. It not only saves the cost of sludge dehydration and drying treatment, but also creates economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of the micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention;

[0031] Figure 2 This is a radial cross-sectional view of the micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention;

[0032] Figure 3 This is a schematic diagram of the interior of the first cell of the shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention;

[0033] Figure 4 This is a schematic diagram of the interior of the second cell of the shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention;

[0034] Figure 5 This is a schematic diagram of the interior of the third cell of the shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention;

[0035] Figure 6 This is a schematic diagram of the interior of the fourth cell of the shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention;

[0036] Figure 7 This is a schematic diagram of the four compartments of the shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention.

[0037] Figure 8 This is a schematic structural diagram of the granular sludge cyclone separator of the micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device of the present invention.

[0038] Figure 9 This is a schematic structural diagram of the micro-shallow aerator of the micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device of the present invention.

[0039] Figure 10 This is a schematic structural diagram of the elutriator of the shallow aeration anaerobic ammonium oxidation granular sludge denitrification device of the present invention.

[0040] In the figure, the accompanying drawings are marked as follows:

[0041] 1. Tank body;

[0042] 2. Pure oxygen collection hood; 21. Pure oxygen collection port;

[0043] 3. Mud collecting hopper;

[0044] 4. First cell area; 41. Shallow aerator; 411. First venturi tube; 412. First diffuser; 413. External pure oxygen port; 42. First water inlet pipe; 43. First water distribution pipe;

[0045] 5. Second cell area; 51. Sludge cyclone separator; 52. Sludge lifter; 53. First bottom sludge suction pipe; 54. Sludge lift pipe; 55. Sludge lift branch pipe; 56. First gas release port;

[0046] 6. Third grid area; 61. Elutriator; 611. Second diffuser; 612. Second venturi tube; 613. External blower port; 62. Second water inlet pipe; 63. Second water distribution pipe;

[0047] 7. Fourth grid area; 71. Outlet weir; 72. Granular sludge cyclone separator; 721. Diversion inlet pipe; 722. Centrifugal water distribution pipe; 73. Outlet pipe; 74. Granular sludge lifter; 75. Second bottom sludge suction pipe; 76. Granular sludge lifting branch pipe; 77. Granular sludge lifting pipe; 78. Second gas release port;

[0048] 8. Diversion pipes in the first and second grid areas;

[0049] 9. Diversion pipes in the third and fourth grid areas. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] The purpose of the present invention is to provide a micro-shallow aeration anaerobic ammonia oxidation granular sludge denitrification device. On the basis of combining the two processes of pure oxygen micro-shallow aeration and anaerobic ammonia oxidation for denitrification, the bottom sludge is continuously washed up and down to granulate the sludge, which not only saves the sludge treatment cost, but also forms granular sludge with high economic value, thereby solving the above-mentioned problems.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] Example 1

[0054] The present embodiment provides a shallow aeration anaerobic ammonia oxidation granular sludge denitrification device, including a tank body 1. The interior of the tank body 1 is radially divided into four independent grid areas along the central axis by a partition. A mud collecting hopper 3 is provided at the bottom of the tank body 1. The mud collecting hopper 3 is an inverted cone. The outer sides of the bottoms of the first grid area 4 to the fourth grid area 7 are inclined surfaces, and the inner sides of the bottoms of the first grid area 4 to the fourth grid area 7 are the lowest planes. The corresponding processes and their synergistic effects are introduced for the four independent grid areas below.

[0055] The first cell zone 4 of this embodiment is used for the ammonia nitrogen nitritation process using pure oxygen and shallow aeration. Unlike traditional processes, the ammonia nitrogen nitritation in the first cell zone 4 of this embodiment uses pure oxygen and shallow aeration instead of bottom air aeration. At normal temperature and pressure, the oxygen content in air is only about 21%, while the oxygen content of pure oxygen is 90% to 100%. The oxygen partial pressure of pure oxygen is 4.4 to 4.7 times higher than that of air. Using pure oxygen for aeration can improve the oxygen transfer capacity to the mixed liquid, obtain higher dissolved oxygen with lower energy consumption, and enhance microbial activity, thereby enhancing the sewage treatment effect.

[0056] like Figure 1-3 As shown in Figure 7, in this embodiment, pure oxygen aeration is performed by evenly arranging multiple micro-shallow aerators 41 80 cm below the liquid surface in the first compartment 4. Micro-shallow aeration has been proven to be an aeration method with very high oxygen utilization rate. The aeration point is located at a position about 0.8 m below the liquid surface, and the oxygen transfer efficiency and utilization rate are optimal. Compared with the aeration method of traditional deep pools more than 3 m, micro-shallow aeration has higher oxygen transfer efficiency. After raising the aeration point, a fan with larger air volume and lower wind pressure can be selected. Such fans often have lower power, which helps to save energy and reduce consumption.

[0057] The top of the first cell 4 is sealed, specifically by a pure oxygen collection hood 2. This hood is equipped with a pure oxygen collection port 21. The oxygen collected by this port is circulated into a micro-shallow aerator 41. Specifically, the external pure oxygen port 413 of the micro-shallow aerator 41 is connected to an external molecular sieve oxygen generator, which produces oxygen with a concentration exceeding 90%. By sealing the reaction cell of the first cell 4, unreacted oxygen escapes into the upper space of the cell, where it is drawn back by the vortex blower for repeated aeration and reuse, further reducing operating costs.

[0058] In addition to pure oxygen micro-shallow aeration, the first water distribution pipe 43 under the liquid surface of the first cell 4 is connected to the first water inlet pipe 42 that penetrates the outside of the side wall. After the water is distributed through the first water distribution pipe 43, the micro-shallow aerator 41 performs pure oxygen micro-shallow aeration. In addition, due to the structural design of the micro-shallow aerator 41, the sludge at the bottom of the first cell 4 can also be slightly washed, such as Figure 9 As shown, the micro-shallow aerator 41 of this embodiment includes a first venturi tube 411 and a first diffusion head 412 vertically arranged on the upper part of the first venturi tube 411. An external pure oxygen port 413 is provided at the connection between the first venturi tube 411 and the first diffusion head 412. The height of the first venturi tube 411 is 6 times the height of the first diffusion head 412. After the pure oxygen enters the micro-shallow aerator 41, it is aerated through the first diffusion head 412, so that the sludge at the bottom is sucked into the first venturi tube 411 and then overflows through the first diffusion head 412, thereby ensuring that it can quickly adapt to the changing organic load and improve the ability to resist load impact. At the same time, the filamentous bacteria in the sludge are suppressed, and dense floc particles are formed through the air-water shear of the shallow micro-aeration. The sludge formed has high sedimentation and biological activity through continuous optimization and screening. Finally, the floc particles are easy to separate after being washed by the shallow micro-aerator, and the sludge production is greatly reduced.

[0059] The first cell 4 controls the appropriate operating conditions through an automatic control program to convert ammonia nitrogen into nitrite nitrogen without excessive conversion to nitrate nitrogen, so as to prevent the accumulation of nitrite nitrogen. The floc particles enter the second cell 5 through the first and second cell guide pipes 8, facilitating cyclone separation in the second cell 5.

[0060] The second cell zone 5 of this embodiment is used for the separation and reflow process of the slightly shallow nitrite sludge. By performing solid-liquid separation on the mud-water mixture in the first cell zone 4, the separated clear liquid containing a large amount of nitrite enters the third cell zone 6 from the top, while the granular sludge at the bottom of the sediment is lifted and enters the first cell zone 4 to supplement the activated sludge, thereby extending the sludge age.

[0061] like Figure 1 、 2As shown in , 4 and 7, the second grid area 5 of this embodiment includes a sludge cyclone separator 51 arranged under the liquid surface of the second grid area 5 and a sludge lifting branch pipe 55 on the liquid surface. One end of the sludge lifting branch pipe 55 is connected to the sludge lifter 52 in the second grid area 5, and the other end of the sludge lifting pipe 54 is connected to the first water distribution pipe 43 of the first grid area 4. The sludge lifter 52 is arranged on the inner side of the bottom of the second grid area 5, and the sludge cyclone separator 51 is arranged above the inclined surface of the second grid area 5.

[0062] The bottom of the sludge lifter 52 of the second cell 5 is connected through a first bottom sludge suction pipe 53. A blower is connected to one side of the sludge lifter 52. A first gas release port 56 is provided on the top of the sludge lifter 54 protruding vertically from the liquid surface. The gas from the sludge lifter 52 rises through the blower and flows out through the first gas release port 56. The stripping effect generated draws the granular sludge on the lowest plane of the second cell 5 and the granular sludge flowing through the inclined surface into the sludge lifter 54 through the first bottom sludge suction pipe 53, and then distributes water to the first cell 4 through the first water distribution pipe 43 of the sludge lifter 54 flow channel to replenish the activated sludge.

[0063] The above description of the sludge return from the second cell 5 to the first cell 4 also includes the water inlet from the first cell 4 to the second cell 5. A first and second cell diversion pipe 8 is provided between the first cell 4 and the second cell 5. One end of the first and second cell diversion pipe 8 extends to the bottom of the first cell 4, and the other end of the first and second cell diversion pipe 8 is directly connected to the sludge cyclone separator 51. Specifically, the liquid level from the first cell 4 to the second cell 5 is sequentially reduced by at least 30 cm, and the top of the first and second cell diversion pipe 8 is provided at the first cell 4. Between the liquid levels of the grid area and the second grid area 5, this can ensure that the mud-water mixture in the first grid area 4 flows into the sludge cyclone separator 51 of the second grid area 5 through the first and second grid area guide pipes 8 for solid-liquid separation. Since the sludge cyclone separator 51 and the sludge cyclone separator 51 granular sludge cyclone separator 5172 have the same structure, the structure of the sludge cyclone separator 51 granular sludge cyclone separator 5172 is described in the fourth grid area 7, and then the specific structure of the sludge cyclone separator 51 of the second grid area 5 is disclosed.

[0064] Through the pure oxygen slightly shallow aeration in the first cell 4 and the solid-liquid separation in the second cell 5, the clear liquid containing a large amount of nitrite in the upper part of the second cell 5 needs to enter the third cell 6 for anaerobic ammonia oxidation denitrification. This is mainly achieved by providing a second water inlet pipe 62 below the liquid level in the upper part of the second cell 5. The clear liquid containing a large amount of nitrite in the upper part of the second cell 5 enters the third cell 6 through the second water inlet pipe 62.

[0065] The third cell area 6 of this embodiment is used for the anaerobic ammonium oxidation denitrification process. The clear liquid containing a large amount of nitrite flowing in through the second water inlet pipe 62 is reduced to nitrogen gas by the autotrophic anaerobic ammonium oxidation sludge without adding a carbon source, thereby achieving the purpose of denitrification.

[0066] like Figure 1 、 2 As shown in Figures 5, 7 and 10, the third cell 6 of this embodiment includes a washer 61 and a second water distribution pipe 63 arranged below the liquid level of the third cell 6. The second water distribution pipe 63 is connected to a second water inlet pipe 62, which passes through the partition and extends to below the liquid level of the second cell 5. The second water inlet pipe 62 contains a large amount of nitrite, which flows into the third cell 6 through the second water distribution pipe 63 and realizes ammonia oxidation autotrophic denitrification through real-time control of online parameters, thereby completing the treatment of sewage.

[0067] like Figure 5 and 10 As shown, the third compartment 6 of this embodiment is provided with a large number of elutriators 61. The elutriators 61 include a second venturi tube 612 and a second diffuser head 611 vertically disposed above the second venturi tube 612. An external blower port 613 is provided at the connection between the second venturi tube 612 and the second diffuser head 611. The height of the first diffuser head 412 is four times that of the first venturi tube 411. The elutriators 61 of this embodiment use air lift to lift the sludge settled at the bottom of the third compartment 6 to approximately 20 cm below the liquid surface, continuously elutriating the sludge. The shear force generated by the continuous collision of bubbles with the first venturi tube 411 accelerates the formation of granular sludge and eliminates fine mud clumps, making the particles more compact. Furthermore, the mud-water mixture enters the bottom of the elutriator 61 and exits from the top, stirring and mixing the water, replacing traditional mixers, which break up granular sludge and prevent it from forming.

[0068] After washing, the sludge in the third cell 6 is accelerated to granulate, the diameter of the granular flocs increases, the settling property is further enhanced, and the biomass per unit volume is greater. The granular sludge then enters the fourth cell 7 from the top for cyclone separation.

[0069] In order to ensure that the granular sludge in the third cell zone 6 enters the fourth cell zone 7, a third and fourth cell zone diversion pipe 9 is arranged between the third cell zone 6 and the fourth cell zone 7. One end of the third and fourth cell zone diversion pipe 9 extends to the bottom in the third cell zone 6, and the other end of the third and fourth cell zone diversion pipe 9 is directly connected to the sludge cyclone separator 51 and the granular sludge cyclone separator 5172. Not only that, the liquid level from the third cell zone 6 to the fourth cell zone 7 is lowered by at least 30 cm, and the top of the third and fourth cell zone diversion pipe 9 is arranged between the liquid levels of the third cell zone and the fourth cell zone 7, so that it can be ensured that the mixture containing granular sludge in the third cell zone 6 can enter the third cell zone 6 for solid-liquid separation.

[0070] The fourth cell area 7 of this embodiment is used for the separation and reflow process of granular sludge. The granular sludge after cyclone separation settles to the bottom and is then lifted to the third cell area 6 for circulation washing. The granular sludge after circulation washing can be directly discharged and sold.

[0071] like Figure 1-2 As shown in Figures 6-8, the fourth grid area 7 of this embodiment includes a granular sludge cyclone separator 72 arranged below the liquid surface of the fourth grid area 7 and a granular sludge lifting branch pipe 76 on the liquid surface. One end of the granular sludge lifting branch pipe 76 is connected to the granular sludge lifter 74 in the fourth grid area 7, and the other end of the granular sludge lifting pipe 77 is connected to the second water distribution pipe 63 of the third grid area 6. The granular sludge lifter 74 is arranged on the inner side of the bottom of the fourth grid area 7, and the granular sludge cyclone separator 72 is arranged above the inclined surface of the fourth grid area 7. The bottom of the granular sludge lifter 74 in the fourth grid area 7 is connected through the second bottom mud suction pipe 75. One side of the granular sludge lifter 74 is connected to a blower, and a second body release port is provided on the top of the granular sludge lifting pipe 77 protruding vertically from the liquid surface.

[0072] The granular sludge lifter 74 allows the gas from the blower to rise and flow out through the second gas release port 78. The steam stripping effect generated draws the granular sludge on the lowest plane of the fourth grid area 7 and the granular sludge flowing through the inclined surface into the granular sludge lifting pipe 77 through the second bottom sludge suction pipe 75, and then passes through the granular sludge lifting pipe 77 to the second water distribution pipe 63 and then distribute water to the third grid area 6 for washing the granular sludge. If the granular sludge needs to be discharged, it can be directly discharged and sold by adjusting the granular sludge lifting pipe 77.

[0073] like Figure 8 As shown, since the sludge cyclone separator 51 and the granular sludge cyclone separator 72 have the same structure, the granular sludge cyclone separator 72 of this embodiment is used as an example for structural description. The granular sludge cyclone separator 72 includes a truncated cone-shaped cylinder and a centrifugal water distribution pipe 722 disposed within the truncated cone-shaped cylinder. The centrifugal water distribution pipe 722 is spirally disposed on the inner wall of the top of the truncated cone-shaped cylinder. The diversion water inlet pipe 721 of the centrifugal water distribution pipe 722 is connected to the diversion pipe 9 of the third and fourth grid areas. The solid-liquid mixture in the third grid area 6 enters the centrifugal water distribution pipe 722 through the diversion water inlet pipe 721 and flows along the inner wall of the truncated cone-shaped cylinder, causing the sewage to form a centrifugal cyclone state. The granular sludge with a larger specific gravity settles quickly, while the water and other light suspended matter rises faster, thereby achieving efficient mud and water separation. The entire process, including the centrifugal cyclone and granular sludge settling, does not require any external power. The falling granular sludge is collected in the mud collecting hopper at the bottom.

[0074] like Figure 6As shown, the fourth cell area 7 of this embodiment is provided with a water outlet weir 71, and the water outlet weir 71 is provided with a water outlet pipe 73 connected to the outside of the tank body 1. The mud and water in the fourth cell area 7 are centrifugally separated by the granular sludge cyclone separator 72, and the finally treated qualified water is discharged through the water outlet weir 71 and the water outlet pipe 73.

[0075] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A shallow aeration anaerobic ammonium oxidation granular sludge denitrification device, characterized in that: include: The tank body is radially divided into four independent compartments along the central axis by partitions, specifically: The first cell is used for ammonia nitrogen nitritation process with pure oxygen shallow aeration, including multiple shallow aerators arranged 80 cm below the liquid surface in the first cell and a first water distribution pipe below the liquid surface, the first water distribution pipe is connected to a first water inlet pipe that runs through the outside of the side wall, and the top of the first cell is sealed; The second cell area is used for the separation and reflow process of the slightly shallow nitrite sludge, including a sludge cyclone separator arranged below the liquid surface of the second cell area and a sludge lifting branch pipe above the liquid surface, one end of the sludge lifting branch pipe is connected to the sludge lifter in the second cell area, and the other end of the sludge lifting pipe is connected to the first water distribution pipe of the first cell area; The third cell area is used for the anaerobic ammonium oxidation denitrification process, including an elutriator and a second water distribution pipe arranged below the liquid level of the third cell area, the second water distribution pipe is connected to a second water inlet pipe, and the second water inlet pipe extends through the partition to below the liquid level of the second cell area; The fourth cell area is used for the separation and reflow process of anaerobic ammonium oxidation granular sludge, including a granular sludge cyclone separator arranged below the liquid surface of the fourth cell area and a granular sludge lifting branch pipe above the liquid surface, one end of the granular sludge lifting branch pipe is connected to the granular sludge lifter in the fourth cell area, and the other end of the granular sludge lifting branch pipe is connected to the second water distribution pipe of the third cell area; A water outlet weir is provided in the fourth grid area, and the water outlet weir is provided with a water outlet pipe communicating with the outside of the tank body.

2. The micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 1 is characterized in that: A first and second cell zone flow guide pipe is provided between the first cell zone and the second cell zone, one end of the first and second cell zone flow guide pipe extends to the bottom of the first cell zone, and the other end of the first and second cell zone flow guide pipe is directly connected to the sludge cyclone separator; A third and fourth grid zone flow guide pipe is provided between the third grid zone and the fourth grid zone, one end of the third and fourth grid zone flow guide pipe extends to the bottom in the third grid zone, and the other end of the third and fourth grid zone flow guide pipe is directly connected to the granular sludge cyclone separator.

3. The micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 2 is characterized in that: The sludge cyclone separator and the granular sludge cyclone separator have the same structure. The granular sludge cyclone separator includes a truncated cone-shaped cylinder and a centrifugal water distribution pipe arranged in the truncated cone-shaped cylinder. The centrifugal water distribution pipe is spirally arranged on the inner wall of the top of the truncated cone-shaped cylinder. The diversion inlet pipe of the centrifugal water distribution pipe is connected to the diversion pipe of the third and fourth grid areas.

4. The micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 2 is characterized in that: The liquid level from the first grid area to the fourth grid area decreases by at least 30 cm in sequence. The top of the guide pipe of the first and second grid areas is set between the liquid levels of the first grid area and the second grid area, and the top of the guide pipe of the third and fourth grid areas is set between the liquid levels of the third grid area and the fourth grid area.

5. The micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 1 is characterized in that: The top of the first cell is sealed by a pure oxygen collection cover, and the top of the pure oxygen collection cover is provided with a pure oxygen collection port, and the oxygen collected by the pure oxygen collection port is circulated and introduced into the shallow aerator; The external pure oxygen port of the micro-shallow aerator is communicated with an external molecular sieve oxygen generator.

6. The micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 1 or 5, characterized in that: The micro-shallow aerator includes a first venturi tube and a first diffusion head vertically arranged on the upper part of the first venturi tube. An external pure oxygen port is provided at the connection between the first venturi tube and the first diffusion head. The height of the first venturi tube is at least 5 times the height of the first diffusion head.

7. The micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 1 is characterized in that: The elutriator includes a second venturi tube and a second diffuser head vertically arranged on the upper part of the second venturi tube. An external blower port is provided at the connection between the second venturi tube and the second diffuser head. The height of the first diffuser head is at least 3 times the height of the first venturi tube.

8. The micro-shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 1 is characterized in that: A mud collecting hopper is provided at the bottom of the tank body. The mud collecting hopper is in an inverted cone shape. The outer side of the bottom of the first to fourth grid areas is an inclined surface, and the inner side of the bottom of the first to fourth grid areas is the lowest plane.

9. The shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 8, characterized in that: The sludge lifter is arranged on the inner side of the bottom of the second cell, and the sludge cyclone separator is arranged above the inclined surface of the second cell; The bottom of the sludge lifter in the second grid area is connected through a first bottom sludge suction pipe. One side of the sludge lifter is connected to a blower. The top of the sludge lifter protruding from the liquid surface in the vertical direction is provided with a first gas release port.

10. The shallow aeration anaerobic ammonium oxidation granular sludge denitrification device according to claim 8, characterized in that: The granular sludge lifter is arranged on the inner side of the bottom of the fourth grid area, and the granular sludge cyclone separator is arranged above the inclined surface of the fourth grid area; The bottom of the granular sludge lifter in the fourth grid area is connected through a second bottom sludge suction pipe, one side of the granular sludge lifter is connected to a blower, and a second body release port is provided at the top of the granular sludge lifter protruding from the liquid surface in the vertical direction.

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