An integrated reaction system and method for synchronous removal of ammonia nitrogen and nitrate nitrogen

Abstract

The present invention discloses an integrated reaction system and control method for the simultaneous removal of ammonia nitrogen and nitrate nitrogen. The system includes a reactor, a water inlet pump, a water distributor, an aeration unit, a water quality analysis unit, a monitoring unit, an ellipsoidal cylinder, an arc cover, a sludge pump, a circulating sludge inlet pipeline, a sludge suction pipeline, a circulating sludge return pipeline, a sludge discharge pipeline, a pH adjustment pipeline, and an ammonia nitrogen adjustment pipeline. Through an internal circulation structure, with AOB as the outsourcing and ANAOB as the core, a new model for increasing the growth rate and value of granular sludge is developed. The present invention can rapidly purify and enrich functional bacteria granular sludge, significantly shortening the startup time of the anaerobic ammonium oxidation integrated reactor, and can simultaneously remove ammonia nitrogen and nitrate nitrogen, with high denitrification efficiency and stable and controllable process operation.

Description

Technical Field

[0001] The present invention relates to an integrated denitrification reaction device, and in particular to an integrated reaction system and method for simultaneously removing ammonia nitrogen and nitrate nitrogen. Background Art

[0002] In recent years, anaerobic ammonium oxidation (ANAMMOX) technology has been increasingly studied in ammonia wastewater treatment because it does not require an external carbon source and can reduce the cost of nitrification alkali and nitrification aeration. The ANAMMOX process can be divided into a single-stage and a two-stage process. The two-stage process occupies a relatively large area and has high investment costs. To ensure back-end treatment efficiency, it is necessary to increase reflux to dilute the front-end influent. In addition, the ratio of nitrite nitrogen to ammonia nitrogen needs to be adjusted, which easily leads to nitrite accumulation. The single-stage process requires short-range nitrification and ANAMMOX to be carried out in the same reactor. The process startup time is very long, the ecological relationship between microorganisms in the reactor is complex, mixed strains are difficult to cultivate, the growth requirements of different strains are conflicting, the optimal reaction conditions are difficult to control, and the strain stability is poor.

[0003] The activity of anaerobic ammonium oxidizing bacteria is inhibited by many factors, enrichment is difficult, and sludge is easy to run, which limits the development and application of anaerobic ammonium oxidation technology. One of the most important problems in the integrated anaerobic ammonium oxidation process is how to control the normal growth and quantity ratio of the two strains of anaerobic ammonium oxidizing bacteria ANAOB and ammonia oxidizing bacteria AOB in the reactor.

[0004] ANAOB has a doubling time of 11 days and an effective retention time (SRT) of over 50 days, while AOB has a doubling time of 1-2 days. The sludge age required to retain AOB after washing the flocculent loose sludge is 3 days. Traditional methods control the amounts of AOB and ANAOB sludge by discharging them separately based on the difference in sludge age. Currently, cyclone separation is commonly used to remove the flocculent sludge in the top layer of the cyclone, which is dominated by AOB bacteria, while retaining the granular sludge containing ANAOB bacteria in the lower layer. However, traditional methods cannot control the ratio of AOB to ANAOB. Furthermore, in actual cyclone separation equipment, ANAOB particles are easily broken into flocculent sludge, resulting in a significant loss of ANAOB bacteria as the upper flocculent sludge is discharged. Therefore, controlling the ratio of the two bacterial species within the integrated reactor requires new solutions and approaches. Summary of the Invention

[0005] Purpose of the invention: Compared with the two-stage anaerobic ammonium oxidation process, the integrated process has low investment cost, small floor space, simple operation mode, and can avoid the problem of nitrite inhibition to a certain extent. In the traditional anaerobic ammonium oxidation integrated reactor, there is no effective structural isolation between the aeration area and the anaerobic area. There is a lack of mass transfer driving force between the two mixed areas. The liquid cannot form an effective circulation flow, and it is difficult to form granular sludge with AOB as the outer layer and ANAOB as the core. In the entire reactor, granular sludge and flocculent sludge are mixed in disorder. As the fluid rises, it generally passes through the sedimentation tank at the top of the reactor for mud and water separation. When the flocculent sludge is discharged, a large amount of granular sludge is also lost. How to control the interception of granular sludge is a difficult problem facing the current process technology. In order to form granular sludge with AOB as the outer layer and ANAOB as the core, and to balance the two strains in the integrated reactor, the present invention provides an integrated reaction system and method for the simultaneous removal of ammonia nitrogen and nitrate nitrogen.

[0006] Technical solution: To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] An integrated reaction system for the simultaneous removal of ammonia nitrogen and nitrate nitrogen, comprising a reactor, a water inlet pump, a water distributor, an aeration unit, a water quality analysis unit, a monitoring unit, an ellipsoidal cylinder, an arc cover, a sludge pump, a circulating sludge inlet pipe, a sludge suction pipe, a circulating sludge return pipe, a sludge discharge pipe, a pH adjustment pipe, and an ammonia nitrogen adjustment pipe, wherein:

[0008] The ellipsoidal cylinder is mounted within the reactor via a mounting bracket. The ellipsoidal cylinder is wide in the middle and narrow at the top and bottom, with both ends open. The water inlet distributor is mounted at the bottom of the reactor, below the ellipsoidal cylinder. The arc cover is mounted above the ellipsoidal cylinder, with its center facing downward.

[0009] The aeration unit includes a high-pressure fan, an upper aeration module, and a lower aeration module. The lower aeration module is arranged at the center of the inner wall of the reactor and the outer wall of the ellipsoidal cylinder. The upper aeration module is arranged above the lower aeration module. The high-pressure fan is connected to the upper aeration module and the lower aeration module respectively.

[0010] A mud-water separation zone is provided on the top of the reactor, an inclined tube sedimentation zone is located above the mud-water separation zone, and an inclined tube sludge settling zone is located below the mud-water separation zone.

[0011] One end of the circulating mud inlet pipe is connected to the inclined tube sludge settling area, and the other end of the circulating mud inlet pipe is connected to the sludge pump inlet port 1. One end of the sludge suction pipe is connected to the sludge settling area at the bottom of the reactor, and the other end is connected to the sludge pump inlet port 2. One end of the circulating mud return pipe is connected to the inner wall of the reactor, and the other end is connected to the sludge pump outlet port 1. The sludge pump outlet port 2 is connected to the mud discharge pipe.

[0012] The pH regulating pipeline and the ammonia nitrogen regulating pipeline are respectively connected to the water inlet of the water distributor.

[0013] The monitoring unit includes a pH online monitor, an ammonia nitrogen online detector, a nitrite nitrogen detector, and a DO online monitor, and the pH online monitor, the ammonia nitrogen online detector, the nitrite nitrogen detector, and the DO online monitor are installed on the reactor.

[0014] The water quality analysis unit is connected to the monitoring unit, the high-pressure blower, the pH regulating pipeline, and the ammonia nitrogen regulating pipeline respectively.

[0015] Preferably, the lower aeration module uses a Φ150 mixed flow aerator, which is perpendicular to the bottom of the reactor and evenly distributed along the circumference of the ellipsoidal tube. The upper aeration module uses a Φ100 mixed flow aerator, which is evenly distributed along the circumference of the ellipsoidal tube. The high-pressure blower is connected to the Φ150 mixed flow aerator and the Φ100 mixed flow aerator respectively through ventilation pipes.

[0016] Preferably: the pH online monitor monitors the pH value of the liquid inside the reactor through a pH monitoring probe, the ammonia nitrogen online detector monitors the liquid ammonia nitrogen concentration inside the reactor through an ammonia nitrogen monitoring probe, the nitrite nitrogen online monitor monitors the nitrite nitrogen concentration inside the reactor through a nitrite nitrogen monitoring probe, and the DO online monitor monitors the DO value inside the reactor through a DO online monitoring probe.

[0017] Preferably, the mud-water separation zone is provided with a separation inlet and an extension port both communicating with the interior of the reactor, the separation inlet being provided with a separation inlet screen, the inclined tube settling zone being provided with an inclined tube settling baffle, the inclined tube settling baffle dividing the inclined tube settling zone into an inner and outer portion, and the inclined tube settling zone being provided with an exhaust pipe and an adjustable and retractable air blowing pipe.

[0018] Preferably, the circulating sludge inlet pipe includes a sludge circulation single-side pipe and a sludge circulation collecting pipe, and the sludge circulation single-side pipe is connected to the inclined tube sludge settling area through the sludge circulation collecting pipe.

[0019] Preferably, the water distribution holes of the water inlet distributor are staggered with each other and are inclined upward at 45 degrees.

[0020] Preferably: the mounting bracket includes a bottom bracket, a middle bracket, and an upper bracket. The bottom of the ellipsoidal tube is fixedly mounted on the inner wall of the reactor through the bottom bracket, the middle of the ellipsoidal tube is fixedly mounted on the inner wall of the reactor through the middle bracket, and the upper part of the ellipsoidal tube is fixedly mounted on the inner wall of the reactor through the upper bracket.

[0021] Preferably, the water inlet distributor is provided with a water inlet pump.

[0022] An integrated reaction method for simultaneously removing ammonia nitrogen and nitrate nitrogen, using the above-mentioned integrated reaction system for simultaneously removing ammonia nitrogen and nitrate nitrogen, comprises the following steps:

[0023] Step 1: After the reactor is inoculated with AOB and ANAOB and initially acclimated, the sewage enters the reactor through the water inlet distributor.

[0024] In step 2, the sewage at the bottom side of the reactor is aerated through the lower aeration module, and the mixed medium is transported upward in a positive direction, with a local upward flow velocity of >3m / s. The upper aeration module is aerated, and the medium swirls upward from the side wall to the center, hits the inner wall of the reactor and the outer wall of the ellipsoidal cylinder, and then rushes to the arc cover plate.

[0025] Step 3: After being shielded by the arc cover, the mixed fluid flows into the ellipsoidal tube and forms water flows rushing to both sides at the bottom of the ellipsoidal tube, thereby forming two internal circulation flows.

[0026] In step 4, part of the mixed fluid continues to flow upward through the mud-water separation area and the separation inlet interception net, and flows to the inclined tube sedimentation area. After being blocked by the inclined tube sedimentation baffle, it first turns downward over the inclined tube sedimentation baffle and then upward. The mixture passes through the inclined tube sedimentation area and the mud and water are separated. The granular sludge has good sedimentation performance and sinks to the bottom, and the upper layer is clear water.

[0027] Step 5: An extension port is set in the mud-water separation zone, and a small amount of mixed liquid enters the bottom of the mud-water separation zone through the extension port, and then passes through the inclined tube sedimentation baffle to achieve mud-water separation. At the same time, the granular sludge flows back to the reactor from the extension port during air blowing.

[0028] Step 6: After the action of the inclined tube sedimentation zone, the supernatant is discharged from the body.

[0029] Step 7: The gas generated by the reaction in the mud-water separation zone is discharged out of the reactor through the exhaust pipe.

[0030] In step 8, part of the sludge at the bottom of the mud-water separation zone flows back into the reactor through the extension port, and part of the sludge flows back to the top of the upper aeration module through the circulating sludge inlet pipe and the sludge pump. The sludge circulation can ensure the sludge amount in the reactor, provide an initial sludge carrier for coupling and wrapping the sludge, and provide a matrix for the proliferation of the composite bacteria.

[0031] Step 9: Preset the DO threshold, free ammonia concentration threshold, and nitrite nitrogen concentration threshold. Use the pH online monitor, ammonia nitrogen online detector, nitrite nitrogen detector, and DO online monitor to detect the pH value, ammonia nitrogen concentration, nitrite nitrogen concentration, and DO value of the solution in the reactor. The water quality analysis unit obtains the free ammonia concentration and free nitrite nitrogen concentration according to the detected pH value, ammonia nitrogen concentration, and nitrite nitrogen concentration according to formulas (1) and (2).

[0032] (1)

[0033] (2)

[0034] Where: represents the free ammonia concentration, Indicates the ammonia nitrogen concentration, Indicates pH value, represents the reaction temperature, Indicates the concentration of free nitrite nitrogen, Indicates the concentration of nitrite nitrogen.

[0035] If the detected DO value is greater than the DO threshold, the water quality analysis unit controls the high-pressure blower for aeration.

[0036] If the calculated free ammonia concentration is greater than the free ammonia concentration threshold, the water quality analysis unit first adjusts the pH to within the pH threshold range through the pH adjustment pipeline. If the free ammonia concentration is still greater than the free ammonia concentration threshold, the water quality analysis unit opens the ammonia nitrogen adjustment pipeline to adjust the free ammonia concentration to within the free ammonia concentration threshold.

[0037] If the calculated nitrite nitrogen concentration is greater than the nitrite nitrogen concentration threshold, the water quality analysis unit first adjusts the pH to within the pH threshold range through the pH adjustment pipeline. If the nitrite nitrogen concentration is still greater than the nitrite nitrogen concentration threshold, the water quality analysis unit opens the ammonia nitrogen adjustment pipeline to adjust the nitrite nitrogen concentration to within the nitrite nitrogen concentration threshold.

[0038] Preferably, the DO threshold is 0.6-0.8 mg / L, the free ammonia concentration threshold is 5-10 mg / L, and the upper limit of the nitrite nitrogen concentration threshold is set to 2 mg / L.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention forms two internal circulation flows through bottom side aeration, arc-shaped cover plates, and ellipsoidal tubes. AOB grows and reproduces under side aeration conditions, while ANAOB bacteria grow and reproduce under anaerobic conditions in the ellipsoidal tube. Under the internal circulation and sludge reflow conditions, the two strains of bacteria come into contact and mix, coupling to form two types of sludge in encapsulated states: one is ANAOB encapsulating AOB, and the other is AOB encapsulating ANAOB. In the former, ANAOB is inhibited by DO, and the encapsulated AOB is easily alienated under anaerobic conditions, so the first type is unstable and easily disintegrates into flocs. In the latter, DO is consumed on the surface of the sludge particles, and the nitrite produced by AOB can be directly produced and consumed as a substrate for ANAOB, thus avoiding the accumulation of nitrite. This type of sludge is easier to synthesize and retain. Aeration and sludge return increase the rising speed of the side wall mixed liquid, which has the effect of expanding the sludge. The expansion of the granular sludge provides space for the growth of internal bacteria. Under the circulation effect, the sludge is slowly compacted in the ellipsoidal cylinder. After several cycles, sludge with large particle size and good sedimentation performance is formed.

[0041] In the mud-water separation area at the top of the reactor, the flocculent sludge and granular sludge have different settling properties, and obvious stratification will be formed in the inclined tube sedimentation area. When the flocculent sludge reaches a certain amount, at the inlet of the separation area, micro-airflow blowing begins in the inner ring area of the inclined tube sedimentation to increase the sedimentation time of the sludge in the sedimentation area, ensuring that the granular sludge with fast sedimentation can settle in the inclined tube first, and the flocculent sludge with poor sedimentation performance will enter the outer ring area of the inclined tube sedimentation, thereby achieving the purpose of separating and balancing AOB and ANAOB sludge.

[0042] This invention utilizes a unique internal circulation structure, with AOB as the outsourcing and ANAOB as the core, to accelerate and increase the value of granular sludge. The unique mud-water separation structure prevents short-circuiting within the reactor, preventing sludge leakage. It also flexibly controls settling time, allowing flocs and loose sludge to be discharged from the reactor, balancing the ratio of AOB to ANAOB. Multifunctional monitoring ensures stable system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the present invention;

[0044] Figure 2 It is a schematic diagram of the structure of the ellipsoidal cylinder, arc cover plate, and mud-water separation area.

[0045] In the figure: 1 is the water inlet pump, 11 is the water inlet distributor, 12 is the pH adjustment pipeline, 13 is the ammonia nitrogen adjustment pipeline, 2 is the high-pressure fan, 21 is the Φ150 mixed flow aerator, 22 is the Φ100 mixed flow aerator, 3 is the water quality analysis unit, 31 is the pH online monitor, 311 is the pH monitoring probe, 32 is the ammonia nitrogen online detector, 321 is the ammonia nitrogen monitoring probe, 33 is the nitrite nitrogen online monitor, 331 is the nitrite nitrogen monitoring probe, 34 is the DO online monitor, 341 is the DO online Monitoring probe, 4 is an ellipsoidal cylinder, 5 is an arc cover, 6 is a mud-water separation area, 61 is a separation inlet screen, 62 is an inclined tube sedimentation baffle, 63 is an exhaust pipe, 64 is an adjustable telescopic air blowing pipe, 65 is an inclined tube sedimentation area, 66 is an extension port, 7 is a sludge pump, 71 is a circulating mud inlet pipe, 711 is a sludge circulation single-side pipe, 712 is a sludge circulation collection pipe, 72 is a mud suction pipe, 73 is a circulating mud return pipe, 74 is a mud discharge pipe, 81 is a bottom bracket, 82 is a middle bracket, and 83 is an upper bracket. DETAILED DESCRIPTION

[0046] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0047] An integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen, such as Figure 1 and 2 As shown, it includes a reactor, a water inlet pump 1, a water inlet distributor 11, an aeration unit, a water quality analysis unit 3, a monitoring unit, an ellipsoidal cylinder 4, an arc cover 5, a sludge pump 7, a circulating sludge inlet pipe 71, a sludge suction pipe 72, a circulating sludge return pipe 73, a sludge discharge pipe 74, a pH adjustment pipe 12, and an ammonia nitrogen adjustment pipe 13, wherein:

[0048] The ellipsoidal tube 4 is installed inside the reactor through a mounting bracket. The shape of the ellipsoidal tube 4 is wide in the middle and narrow at the upper and lower ends, and the upper and lower ends of the ellipsoidal tube 4 are open. The water inlet distributor 11 is installed at the bottom of the reactor, and the water inlet distributor 11 is located below the ellipsoidal tube 4. The water distribution holes of the water inlet distributor 11 are staggered with each other, and the water distribution holes are inclined upward at 45 degrees. The arc cover plate 5 is installed above the ellipsoidal tube 4, and the center of the arc cover plate 5 is downward. The ellipsoidal tube 4 divides the reactor into two areas. The outside of the ellipsoidal tube 4 forms an aerobic zone due to aeration, and the ellipsoidal tube 4 separates the aeration into an anaerobic environment inside the tube for the growth of ANAOB bacteria. The ellipsoidal tube 4 is wide in the middle and narrow at both ends, wherein the water flow forms a flow velocity difference, and the flow velocity in the middle is the slowest, which facilitates the contact and coupling of AOB and ANAOB.

[0049] The mounting bracket includes a bottom bracket 81, a middle bracket 82, and an upper bracket 83. The bottom of the ellipsoidal tube 4 is fixedly mounted on the inner wall of the reactor through the bottom bracket 81, the middle of the ellipsoidal tube 4 is fixedly mounted on the inner wall of the reactor through the middle bracket 82, and the upper part of the ellipsoidal tube 4 is fixedly mounted on the inner wall of the reactor through the upper bracket 83.

[0050] The aeration unit includes a high-pressure fan 2, an upper aeration module, and a lower aeration module. The lower aeration module is arranged at the center of the inner wall of the reactor and the outer wall of the ellipsoid tube 4. The upper aeration module is arranged above the lower aeration module. The high-pressure fan 2 is connected to the upper aeration module and the lower aeration module respectively. The lower aeration module adopts a Φ150 mixed flow aerator 21, which is perpendicular to the bottom of the reactor and is evenly distributed along the circumference of the ellipsoid tube 4. The upper aeration module adopts a Φ100 mixed flow aerator 22, which is evenly distributed along the circumference of the ellipsoid tube 4. The high-pressure fan 2 is connected to the Φ150 mixed flow aerator 21 and the Φ100 mixed flow aerator 22 respectively through a ventilation pipe. The Φ150 mixed flow aerator 21 and the Φ100 mixed flow aerator 22 provide oxygen and aeration, creating an aerobic environment conducive to the growth and reproduction of AOB bacteria. They also accelerate upward flow, allowing the sludge to rise rapidly within the reactor while rapidly reducing water pressure, facilitating sludge bulking. The Φ100 mixed flow aerator 22 also prevents sludge from accumulating at angles.

[0051] Inside the reactor, the mixed liquid outside the ellipsoidal tube has an upward flow velocity in the Φ150 high-efficiency mixed flow aerator 21 and the Φ100 high-efficiency mixed flow aerator 22, and reverses downward after being blocked by the arc cover plate 5. When aeration oxygenates the mixed medium upward, a relative negative pressure is formed at the bottom of the aerator, generating horizontal suction in the same area, which lifts the lower water upward and then folds it down, circulating to form two internal circulation flows. When the reactor is reacted with water, the medium in the tube is slowed down by the joint action of the water distributor 11 and the arc cover plate 5, which can ensure the reaction time of the anaerobic ammonia oxidation area. AOB and ANAOB continuously switch between aerobic and anaerobic environments in this cycle, which is beneficial to the metabolism and mutual mass transfer of the encapsulated strains, strengthens the degree of coupling between the strains, and is conducive to the formation of a state in which the two strains of bacteria wrap each other and grow stably.

[0052] The monitoring unit includes a pH online monitor 31, an ammonia nitrogen online detector 32, and a DO online monitor 34. The pH online monitor 31, the ammonia nitrogen online detector 32, and the DO online monitor 34 are installed on the reactor.

[0053] Inside the ellipsoidal cylinder 4 and within the reactor wall, pH monitoring probes 311, ammonia nitrogen monitoring probes 321, nitrite nitrogen monitoring probes 331, and DO online monitoring probes 341 are installed to monitor water quality. These probes are connected to online pH monitors 31, online ammonia nitrogen monitors 32, online nitrite nitrogen monitors 33, and online DO monitors 34. Data from online DO monitors 34 is transmitted to the control system of high-pressure blower 2 to maintain DO within the set range. Online pH monitors 31, online ammonia nitrogen monitors 32, and online nitrite nitrogen monitors 33 are connected to water quality analysis system 3. This system sets pH, ammonia nitrogen, and nitrite nitrogen concentration ranges and calculates free nitrite (FNA) and free ammonia (FA) concentrations based on the monitored data and real-time temperature input. These concentrations are then set within these ranges. If any data exceeds these ranges, an alarm will be issued, automatically activating the pH adjustment system first. If the FA value fails to be reduced to the preset value within the maximum adjustment range, the system will automatically activate the ammonia nitrogen adjustment pipeline. Once the FA value is reduced, the corresponding adjustment system will cease. The pH online monitor 31 monitors the pH value of the liquid inside the reactor through the pH monitoring probe 311, the ammonia nitrogen online detector 32 monitors the liquid ammonia nitrogen concentration inside the reactor through the ammonia nitrogen monitoring probe 321, the nitrite nitrogen online monitor 33 monitors the nitrite nitrogen concentration inside the reactor through the nitrite nitrogen monitoring probe 331, and the DO online monitor 34 monitors the DO value inside the reactor through the DO online monitoring probe 341.

[0054] The reactor is topped with a mud-water separation zone 6, which includes a separation inlet and an extension port 66, both connected to the interior of the reactor. A separation inlet screen 61 is provided on the separation inlet to prevent large sludge particles from entering the inclined tube sedimentation device, thereby intercepting large sludge particles. Above the mud-water separation zone 6 is an inclined tube sedimentation zone 65, and below the mud-water separation zone 6 is an inclined tube sludge settling zone. An inclined tube sedimentation baffle 62 is provided within the inclined tube sedimentation zone 65, dividing it into an inner and outer portion. The baffle prevents short-circuiting of the medium and extends the total sedimentation time of the sludge in this area, preventing uninterrupted small sludge particles from directly overflowing the reactor. An exhaust pipe 63 and an adjustable, telescopic air duct 64 are provided within the inclined tube sedimentation zone 65. Nitrogen gas is generated by some sludge in the sedimentation zone and the inclined tube sedimentation device, and is discharged through the exhaust pipe 63 to prevent the gas from floating up and disrupting the normal sedimentation of the sludge. When the amount of flocculent sludge reaches a certain level, on the side of the inner ring of the water inlet, the adjustable telescopic blowing pipe 64 starts to blow micro-airflow in the area of the inner inclined tube device, extending the sedimentation time of the flocculent sludge in the sedimentation area, ensuring that the granular sludge with fast sedimentation can be settled in the inclined tube first, and the flocculent sludge with poor sedimentation performance enters the outer ring mud-water separation area with the water flow and naturally settles, so that the ratio of the number of flocculent AOB and ANAOB granular sludge can be controlled.

[0055] One end of the circulating mud inlet pipe 71 is connected to the inclined tube sludge sedimentation area, and the other end of the circulating mud inlet pipe 71 is connected to the inlet end 1 of the sludge pump 7. One end of the sludge suction pipe 72 is connected to the sludge sedimentation area at the bottom of the reactor, and the other end is connected to the inlet end 2 of the sludge pump 7. One end of the circulating mud return pipe 73 is connected to the inner wall of the reactor, and the other end is connected to the outlet end 1 of the sludge pump 7, and the outlet end 2 of the sludge pump 7 is connected to the mud discharge pipe 74. The circulating mud inlet pipe 71 is connected to the sludge pump 7 to return the larger flocculent sludge and fine granular sludge to the top of the Φ100 high-efficiency mixed flow aerator 22, thereby increasing the effective contact between the sludge and the sewage, and further coupling the small granular sludge and AOB in the aerobic area, thereby increasing the possibility of forming granular sludge with AOB as the outer layer and ANAOB as the core. A mud discharge pipe is provided at the bottom of the reactor to discharge the excess sludge and aged sludge to ensure the high activity of the sludge.

[0056] The circulating sludge inlet pipe 71 includes a sludge circulation single-side pipe 711 and a sludge circulation collecting pipe 712 . The sludge circulation single-side pipe 711 is connected to the inclined tube sludge settling area through the sludge circulation collecting pipe 712 .

[0057] The water inlet distributor 11 is provided with a water inlet pump 1 .

[0058] An integrated reaction method for simultaneous removal of ammonia nitrogen and nitrate nitrogen, such as Figure 1 and 2 As shown, the integrated reaction system for simultaneously removing ammonia nitrogen and nitrate nitrogen comprises the following steps:

[0059] Step 1: After the reactor is inoculated with AOB and ANAOB and preliminarily acclimated, the sewage enters the water distributor 11 through the water inlet pump 1 and then enters the reactor through the water inlet distributor.

[0060] Step 2: The sewage at the bottom side of the reactor is aerated by the Φ150 high-efficiency mixed flow aerator 21. The mixed medium is transported upward in a positive direction, and the local upward flow velocity is greater than 3m / s. The Φ100 high-efficiency mixed flow aerator 22 is aerated, and the medium swirls upward from the side wall to the center, hits the inner wall of the reactor and the outer wall of the ellipsoidal cylinder, and then rushes to the arc cover plate 5.

[0061] Step 3: After being shielded by the arc cover 5, the mixed fluid flows into the ellipsoidal tube 4 and forms water flows rushing to both sides at the bottom of the ellipsoidal tube 4, thereby forming two internal circulation flows.

[0062] In step 4, part of the mixed fluid continues to flow upward through the mud-water separation zone 6 and the separation inlet interception screen 61 to the inclined tube sedimentation zone 65. After being blocked by the inclined tube sedimentation baffle 62, it first turns downward over the inclined tube sedimentation baffle 62 and then upward. The mixture passes through the inclined tube sedimentation zone 65 and the mud and water are separated. The granular sludge has good sedimentation performance and sinks to the bottom, and the upper layer is clear water.

[0063] In step 5, an extension port 66 is provided in the mud-water separation zone 6. A small portion of the mixed liquid enters the bottom of the mud-water separation zone 6 through the extension port 66, and then passes through the inclined tube sedimentation baffle 62 to achieve mud-water separation. At the same time, the granular sludge flows back to the reactor from the extension port 66 during air blowing.

[0064] Step 6: After the inclined tube sedimentation zone 65 acts, the supernatant is discharged from the body.

[0065] Step 7: The gas generated by the reaction in the mud-water separation zone 6 is discharged out of the reactor through the exhaust pipe 63.

[0066] In step 8, part of the sludge at the bottom of the mud-water separation zone 6 flows back into the reactor through the extension port 66, and part of the sludge flows back to the top of the upper aeration module through the circulating mud inlet pipe 71 and the sludge pump 7. The sludge circulation can ensure the sludge amount in the reactor, provide an initial sludge carrier for coupling and wrapping the sludge, and provide a matrix for the proliferation of the composite bacteria.

[0067] Step 9: During normal operation, the DO value range is 0.6-0.8 mg / L. The high-pressure blower frequency is linked to the DO value to control the DO value range. The pH setting range of the water quality analysis unit 3 is 7.6-8, the ammonia nitrogen setting range is 50-150 mg / L, and the nitrite nitrogen setting range is less than 150 mg / L. The DO threshold, free ammonia concentration threshold, and nitrite nitrogen concentration threshold are pre-set. The pH value, ammonia nitrogen concentration, nitrite nitrogen concentration, and DO value of the solution in the reactor are detected by the pH online monitor 31, the ammonia nitrogen online detector 32, the nitrite nitrogen detector 33, and the DO online monitor 34. The water quality analysis unit 3 calculates the free ammonia concentration and free nitrite nitrogen concentration according to equations 1 and 2 based on the detected pH value, ammonia nitrogen concentration, and nitrite nitrogen concentration. The DO threshold is 0.6-0.8 mg / L, the free ammonia concentration threshold is 5-10 mg / L, and the upper limit of the nitrite nitrogen concentration threshold is set to 2 mg / L. Two value segments are set for each value range. The alarm system of the normal operating value segment lights up green, the high value segment lights up red, and an alarm is issued when the value range is exceeded.

[0068] (1)

[0069] (2)

[0070] Where: represents the free ammonia concentration, Indicates the ammonia nitrogen concentration, Indicates pH value, represents the reaction temperature, Indicates the concentration of free nitrite nitrogen, Indicates the concentration of nitrite nitrogen.

[0071] If the detected DO value is greater than the DO threshold, the water quality analysis unit 3 controls the high-pressure blower 2 for aeration.

[0072] If the calculated free ammonia concentration is greater than the free ammonia concentration threshold, the water quality analysis unit 3 first adjusts the pH to within the pH threshold range through the pH adjustment pipeline 12. If the free ammonia concentration is still greater than the free ammonia concentration threshold, the water quality analysis unit 3 opens the ammonia nitrogen adjustment pipeline 13 to adjust the free ammonia concentration to within the free ammonia concentration threshold.

[0073] If the calculated nitrite nitrogen concentration is greater than the nitrite nitrogen concentration threshold, the water quality analysis unit 3 first adjusts the pH to within the pH threshold range through the pH adjustment pipeline 12. If the nitrite nitrogen concentration is still greater than the nitrite nitrogen concentration threshold, the water quality analysis unit 3 opens the ammonia nitrogen adjustment pipeline 13 to adjust the nitrite nitrogen concentration to within the nitrite nitrogen concentration threshold.

[0074] If both the free ammonia concentration and the free nitrite nitrogen concentration exceed the range at the same time, adjust the free ammonia concentration first and then the free nitrite nitrogen concentration. Among the factors for adjusting the free ammonia concentration, the priority is to adjust the pH and then adjust the ammonia nitrogen concentration.

[0075] Step 10: After running for a period of time, the mixed liquid in the reactor is taken for SV30 monitoring. If the flocculent sludge settling volume / particle settling volume is greater than 1 / 5, when water is introduced, the telescopic blowing pipe 64 can be adjusted to start micro-airflow blowing in the inner inclined tube device area to reflux the granular sludge. At the same time, the circulating mud inlet pipe 71 and the circulating mud return pipe 73 are closed, and the mud suction pipe 72 and the mud discharge pipe 74 are opened to discharge the excess flocculent sludge out of the reactor. The mud discharge time is 10 to 12 minutes to ensure a balanced settling volume ratio of the two sludges.

[0076] Step 11: Periodically purge the inclined tube sedimentation area 65 through the adjustable telescopic blowing pipe 64.

[0077] Based on the theory that ANAOB uses AOB products as reaction substrates, this invention constructs a new anaerobic ammonium oxidation denitrification reactor. By virtue of the reactor device configuration design and the control of the bacterial growth environment, granular sludge with AOB as the outer layer and ANNOB as the core is formed inside the reactor, which quickly purifies and enriches the functional bacteria granular sludge, accelerates the start-up of the anaerobic ammonium oxidation integrated reactor, ensures the stable operation of the anaerobic ammonium oxidation process, and improves the denitrification efficiency of the anaerobic ammonium oxidation reactor. The integrated reactor of this invention system can successfully and efficiently process NH3-N and NO X -N wastewater, the ammonia nitrogen conversion rate and denitrification effect can reach 90%.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen, characterized by: The system comprises a reactor, a water inlet pump (1), a water inlet distributor (11), an aeration unit, a water quality analysis unit (3), a monitoring unit, an ellipsoidal cylinder (4), an arc cover plate (5), a sludge pump (7), a circulating sludge inlet pipe (71), a sludge suction pipe (72), a circulating sludge return pipe (73), a sludge discharge pipe (74), a pH regulating pipe (12), and an ammonia nitrogen regulating pipe (13), wherein: The ellipsoidal cylinder (4) is installed inside the reactor through a mounting bracket. The ellipsoidal cylinder (4) is wide in the middle and narrow at the upper and lower ends, and both upper and lower ends of the ellipsoidal cylinder (4) are open. The water inlet distributor (11) is installed at the bottom of the reactor, and the water inlet distributor (11) is located below the ellipsoidal cylinder (4). The arc cover plate (5) is installed above the ellipsoidal cylinder (4), and the center of the arc cover plate (5) is downward. The aeration unit comprises a high-pressure blower (2), an upper aeration module, and a lower aeration module. The lower aeration module is arranged at the center of the inner wall of the reactor and the outer wall of the ellipsoidal cylinder (4). The upper aeration module is arranged above the lower aeration module. The high-pressure blower (2) is connected to the upper aeration module and the lower aeration module respectively. A mud-water separation zone (6) is provided on the top of the reactor, an inclined tube sedimentation zone (65) is located above the mud-water separation zone (6), and an inclined tube sludge sedimentation zone is located below the mud-water separation zone (6); One end of the circulating mud inlet pipe (71) is connected to the inclined tube sludge settling area, and the other end of the circulating mud inlet pipe (71) is connected to the inlet end 1 of the sludge pump (7); one end of the mud suction pipe (72) is connected to the sludge settling area at the bottom of the reactor, and the other end is connected to the inlet end 2 of the sludge pump (7); one end of the circulating mud return pipe (73) is connected to the inner wall of the reactor, and the other end is connected to the outlet end 1 of the sludge pump (7), and the outlet end 2 of the sludge pump (7) is connected to the mud discharge pipe (74); The pH regulating pipeline (12) and the ammonia nitrogen regulating pipeline (13) are respectively connected to the water inlet of the water distributor (11); The monitoring unit includes a pH online monitor (31), an ammonia nitrogen online monitor (32), a nitrite nitrogen online monitor (33), and a DO online monitor (34), and the pH online monitor (31), the ammonia nitrogen online monitor (32), the nitrite nitrogen online monitor (33), and the DO online monitor (34) are installed on the reactor; The water quality analysis unit (3) is respectively connected to the monitoring unit, the high-pressure blower (2), the pH regulating pipeline (12), and the ammonia nitrogen regulating pipeline (13); Two internal circulation flows are formed through bottom side aeration, arc-shaped cover and ellipsoidal tube. AOB grows and reproduces under side aeration conditions, and ANAOB bacteria grow and reproduce under anaerobic conditions in the ellipsoidal tube. Under the internal circulation effect and sludge return conditions, the two strains of bacteria contact and mix, and couple into two wrapped sludge states, one is AOB wrapped in ANAOB, and the other is ANAOB wrapped in AOB.

2. The integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen according to claim 1, characterized in that: The lower aeration module adopts a Φ150 mixed flow aerator (21), the Φ150 mixed flow aerator (21) is perpendicular to the bottom of the reactor, and the Φ150 mixed flow aerator (21) is evenly distributed along the circumference of the ellipsoid tube (4); the upper aeration module adopts a Φ100 mixed flow aerator (22), and the Φ100 mixed flow aerator (22) is evenly distributed along the circumference of the ellipsoid tube (4); the high-pressure fan (2) is respectively connected to the Φ150 mixed flow aerator (21) and the Φ100 mixed flow aerator (22) through a ventilation pipe.

3. The integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen according to claim 2, characterized in that: The pH online monitor (31) monitors the pH value of the liquid inside the reactor through the pH monitoring probe (311), the ammonia nitrogen online detector (32) monitors the ammonia nitrogen concentration of the liquid inside the reactor through the ammonia nitrogen monitoring probe (321), the nitrite nitrogen online monitor (33) monitors the nitrite nitrogen concentration inside the reactor through the nitrite nitrogen monitoring probe (331), and the DO online monitor (34) monitors the DO value inside the reactor through the DO online monitoring probe (341).

4. The integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen according to claim 3, characterized in that: The mud-water separation zone (6) is provided with a separation inlet and an extension port (66) both of which are connected to the interior of the reactor. A separation inlet screen (61) is provided on the separation inlet. An inclined tube sedimentation baffle (62) is provided in the inclined tube sedimentation zone (65). The inclined tube sedimentation baffle (62) divides the inclined tube sedimentation zone (65) into two parts, an inner part and an outer part. An exhaust pipe (63) and an adjustable telescopic air blowing pipe (64) are provided in the inclined tube sedimentation zone (65).

5. The integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen according to claim 4, characterized in that: The circulating sludge inlet pipe (71) comprises a sludge circulation single-side pipe (711) and a sludge circulation collecting pipe (712). The sludge circulation single-side pipe (711) is connected to the inclined tube sludge settling area via the sludge circulation collecting pipe (712).

6. The integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen according to claim 5, characterized in that: The water distribution holes of the water inlet distributor (11) are staggered with each other, and the water distribution holes are inclined upward at 45 degrees.

7. The integrated reaction system for simultaneous removal of ammonia nitrogen and nitrate nitrogen according to claim 6, characterized in that: The mounting bracket comprises a bottom bracket (81), a middle bracket (82), and an upper bracket (83); the bottom of the ellipsoidal tube (4) is fixedly mounted on the inner wall of the reactor via the bottom bracket (81); the middle of the ellipsoidal tube (4) is fixedly mounted on the inner wall of the reactor via the middle bracket (82); and the upper part of the ellipsoidal tube (4) is fixedly mounted on the inner wall of the reactor via the upper bracket (83).

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