High-activity granular sludge trapping device and method and anaerobic ammonia oxidation reactor

Abstract

The invention relates to a high-activity granular sludge trapping device, a high-activity granular sludge trapping method and an anaerobic ammonia oxidation reactor, and the trapping device comprises a screening module arranged at the bottom of the trapping device and used for receiving and screening anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor, the high-activity granular sludge floats to the top of the screening module, and the low-activity granular sludge sinks to the bottom of the screening module; the stirring precipitation module and the screening module are arranged at the bottom of the trapping device side by side, and the stirred high-activity granular sludge sinks to the bottom and returns to the anaerobic ammonia oxidation reactor; the partition plate is arranged between the screening module and the stirring precipitation module and separates the screening module from the stirring precipitation module, and the height of the partition plate is set to enable the high-activity granular sludge of the screening module to climb over and enter the stirring precipitation module. Compared with the prior art, efficient separation, concentration and directional reflux of high-activity sludge are realized, the problem of sludge loss is solved, suspended solids in effluent are reduced, and the treatment efficiency and long-term stability of the reactor are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of anaerobic ammonia oxidation water treatment, in particular to a high-activity granular sludge trapping device, method and anaerobic ammonia oxidation reactor. BACKGROUND

[0002] Nitrogen exists in various forms in nature, including ammonia nitrogen (NH4 + ), nitrite nitrogen (NO2 - ), nitrate nitrogen (NO3 - ), etc. These forms of nitrogen are involved in important physiological processes such as protein synthesis and energy metabolism in living organisms. With the rapid development of industrialization and urbanization, water nitrogen pollution is becoming increasingly serious. Excessive nitrogen emissions can lead to water eutrophication, causing water blooms, algae outbreaks and other environmental problems, causing damage to aquatic ecosystems and threatening human health.

[0003] To control water nitrogen pollution, various wastewater denitrification technologies have been developed, mainly including physical and biological methods. Physical methods such as coagulation sedimentation, adsorption, ion exchange, etc. remove nitrogen in wastewater through physical or chemical methods. These methods are simple to operate, but have high processing costs and are prone to secondary pollution. Biological methods use the physiological metabolic activities of microorganisms to convert nitrogen in wastewater into harmless substances, mainly including nitrification-denitrification and anaerobic ammonia oxidation. Anaerobic ammonia oxidation is a new and efficient wastewater denitrification technology, which converts ammonia nitrogen and nitrite nitrogen into nitrogen gas and part of nitrate nitrogen under anaerobic conditions by anaerobic ammonia oxidation bacteria. Compared with traditional nitrification-denitrification processes, anaerobic ammonia oxidation processes have the advantages of high denitrification efficiency, no need for external organic carbon source, low energy consumption, low sludge production, and low greenhouse gas emissions.

[0004] However, in current practical engineering applications, the performance of the three-phase separator in the Anammox process is not satisfactory compared to other types of anaerobic reactors, which leads to higher activity of anaerobic ammonia oxidation granular sludge floating on the water surface (as shown in Figure 1 ), which not only leads to the suspended solid concentration of the effluent exceeding the standard, but also leads to the loss of high-activity anaerobic ammonia oxidation granular sludge. Therefore, some researchers have proposed a high-activity granular sludge trapping device for use in anaerobic ammonia oxidation reactors to solve the problems existing in the prior art.

[0005] Patent publication number CN204999788U discloses an anaerobic granular sludge trapping device, including a granular trapping device, a backwashing device and a granular sludge recovery device, the granular trapping device is internally provided with a filter core, the granular trapping device bottom water inlet end is connected to the water outlet of an anaerobic reaction tank through a water inlet pipeline, a water inlet valve is arranged on the water inlet pipeline, the granular trapping device top water outlet end is connected with a water outlet pipeline, a water outlet valve is arranged on the water outlet pipeline, the water outlet end is connected to the backwashing device through a backwashing pipeline, a backwashing valve is arranged on the backwashing pipeline, the granular trapping device bottom sludge discharge end is connected to the granular sludge recovery device through a sludge discharge pipeline, and a sludge discharge valve is arranged at the bottom of the granular sludge trapping device. However, the trapping device relies on the filter core for filtering, and the anaerobic ammonia oxidation high-activity granular sludge is often low in density and easy to float on the water surface, so it is not easy to be effectively trapped by the filter core. SUMMARY

[0006] The purpose of the present application is to overcome the defects of the prior art and provide a high-activity granular sludge trapping device, method and anaerobic ammonia oxidation reactor. Through the combined design of the screening module and the stirring and sedimentation module, the mechanisms of gravity flow, screening, flotation, surface stirring and sedimentation reflux are utilized to realize the efficient separation, concentration and directional reflux of high-activity sludge, thereby solving the sludge loss problem, reducing the suspended solids in the effluent and ensuring the treatment efficiency and long-term stability of the reactor.

[0007] The purpose of the present application can be achieved by the following technical solutions: One of the technical solutions of the present application is to provide a high-activity granular sludge trapping device for connecting with an anaerobic ammonia oxidation reactor, which comprises: A screening module arranged at the bottom of the trapping device receives the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor and screens it, so that the high-activity granular sludge floats to the top of the screening module and the low-activity granular sludge sinks to the bottom of the screening module; A stirring and sedimentation module arranged side by side with the screening module at the bottom of the trapping device, the stirred high-activity granular sludge sinks to the bottom and returns to the anaerobic ammonia oxidation reactor; And a partition plate arranged between and separating the screening module and the stirring and sedimentation module, the height of the partition plate is set to make the high-activity granular sludge of the screening module jump over and enter the stirring and sedimentation module.

[0008] Further, the screening module is provided with several guide vanes. The screening module of the trapping device can further screen high-activity granular sludge. The anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor is not all high-activity granular sludge, and thus needs to be further screened. The high-activity granular sludge is made to float over the partition plate into the stirring and precipitation module by the guide vanes of the screening module, while the low-activity granular sludge is made to sink to the bottom of the screening module, and is emptied after reaching a certain amount.

[0009] Still further, the guide vanes are inclined or vertically arranged in the screening module. And / or, the guide vanes are perforated plates or grating plates.

[0010] Still further, the screening module further comprises a sample inlet pipe connected with the effluent pipe of the anaerobic ammonia oxidation reactor, and a first sludge discharge pipe at the bottom of the screening module for discharging low-activity granular sludge.

[0011] Still further, the first sludge discharge pipe is provided with a sludge discharge valve.

[0012] Still further, the sample inlet pipe is connected with the effluent pipe of the anaerobic ammonia oxidation reactor through a pipeline, and a sample inlet valve is arranged therebetween.

[0013] Still further, the height of the sample inlet pipe is lower than that of the effluent pipe of the anaerobic ammonia oxidation reactor, and the sample inlet pipe is located at the lower part of the screening module, so that the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor flows into the lower part of the screening module in the trapping device by gravity.

[0014] Further, the stirring and precipitation module is provided at the top with a surface stirrer which only stirs the liquid surface or surface layer area of the stirring and precipitation module. The surface stirrer is one of a surface turbine stirrer, a surface scraper stirrer or a low-speed pusher.

[0015] Still further, the surface stirrer can be installed through a truss structure or the like without affecting the high-activity granular sludge in the screening module to float over the partition plate into the stirring and precipitation module.

[0016] Still further, the rotation speed of the surface stirrer is 10-30 r / min, preferably about 15-25 r / min.

[0017] Further, the height of the trapping device is 1.2-1.5 m, the height of the screening module and the stirring and sedimentation module is 45%-55% of the height of the trapping device. The height of the baffle is about 1 / 2-3 / 4 of the effective water depth. The surface stirrer only stirs the liquid surface or surface layer of the stirring and sedimentation module, and the trapping device has a high height, so that the nitrogen produced by the high-activity granular sludge after stirring is separated from the high-activity granular sludge and released, and the high-activity granular sludge can be precipitated in the middle and lower part of the stirring and sedimentation module without being affected by the upper stirring, so that a large amount of water can be treated continuously for a period of time.

[0018] Further, the stirring and sedimentation module comprises a stirring zone at the upper part and a sedimentation zone at the lower part, and the surface stirrer is located in the stirring zone to stir the liquid surface or surface layer to destroy the surface tension of the high-activity granular sludge and the adhesion of the high-activity granular sludge to the bubbles, and the stirred high-activity granular sludge is precipitated in the sedimentation zone.

[0019] Further, the stirring and sedimentation module is further provided with a reflux pipe connected with the influent pipe of the anammox reactor, and a reflux pump is arranged on the reflux pipe. The high-activity granular sludge after stirring is precipitated to the bottom of the stirring and sedimentation module, and is pumped into the influent pipe of the anammox reactor by the reflux pump, and enters the anammox reactor together with the influent.

[0020] Further, a reflux valve is arranged on the reflux pipe.

[0021] The high-activity granular sludge trapping device is independent of the anammox reactor, and does not affect the operation of the anammox reactor. When there is no floating granular sludge on the water surface, the sampling valve and the reflux valve can be closed, and the operation of the high-activity granular sludge trapping device is stopped, thereby saving energy consumption.

[0022] Further, the trapping device further comprises a three-phase separation module arranged above the screening module and the stirring and sedimentation module.

[0023] Further, the three-phase separation module is a first three-phase separator, which comprises: a gas collection hood for collecting biogas; a water outlet weir arranged on one side or around the gas collection hood and used for discharging clean water; and a baffle group arranged below the gas collection hood.

[0024] The second technical scheme of the present application provides a high-activity granular sludge trapping method, which is implemented by using the high-activity granular sludge trapping device, and comprises the following steps: S1, introducing the anammox granular sludge floating on the water surface in the anammox reactor into the screening module; S2, in the screening module, screening is carried out by using gravity sedimentation and floatation, so that high-activity granular sludge floats to the top of the screening module and low-activity granular sludge sinks to the bottom of the screening module; S3, the high-activity granular sludge enriched in the upper part of the screening module is made to jump over the partition plate and enter the stirring and sedimentation module adjacent to the partition plate; S4, in the stirring and sedimentation module, the surface or surface layer area is stirred to destroy the surface tension of the high-activity granular sludge and the adhesion of the high-activity granular sludge to air bubbles, and the settling of the high-activity granular sludge is promoted; S5, the high-activity granular sludge settled to the bottom of the stirring and sedimentation module is backflowed to the anaerobic ammonia oxidation reactor.

[0025] The third technical scheme of the present application provides an anaerobic ammonia oxidation reactor comprising the high-activity granular sludge trapping device.

[0026] Further, the effluent pipeline of the anaerobic ammonia oxidation reactor is located at the upper part, and the influent pipeline is located at the lower part.

[0027] Further, the upper part of the anaerobic ammonia oxidation reactor is provided with a second three-phase separator.

[0028] Further, the anaerobic ammonia oxidation reactor is provided with a second sludge discharge pipeline.

[0029] Further, the effluent outlet of the anaerobic ammonia oxidation reactor is provided with a screen in communication with the next reactor, which intercepts the anaerobic ammonia oxidation granular sludge floating on the water surface, avoids the concentration of suspended solids in the effluent water exceeding the standard, and prevents the loss of high-activity anaerobic ammonia oxidation granular sludge.

[0030] Compared with the prior art, the present application has the following advantages: (1) The high-activity granular sludge trapping device of the present application is used in the anaerobic ammonia oxidation reactor and is attached to the anaerobic ammonia oxidation reactor but exists independently. When the granular sludge floating on the water surface is good, the sampling valve and the backflow valve are closed, and the operation is stopped to save energy. The screening module of the device can further screen the high-activity granular sludge, improve the activity of the backflow sludge, and thus improve the operation efficiency of the anaerobic ammonia oxidation reactor. The surface stirrer in the stirring and sedimentation module of the trapping device only stirs the liquid surface or surface layer area and the middle and lower parts are used for sedimentation, which can continuously operate for a period of time and handle a large amount of water.

[0031] (2) The present application can effectively solve the problem of loss of high-activity anaerobic ammonia oxidation granular sludge, the core of which is to abandon the traditional passive idea of "filtration and retention", and instead actively use the physical characteristics of high-activity sludge itself, i.e. "low density and easy to float", to design a set of "dredging" rather than "interception" process route. The basic principle is gravity screening, interface destruction and directional reflux.

[0032] (3) The role of the screening module of the present application is not simple filtration, but through the guide plate to create a hydraulic separation environment. After the influent impacts the guide plate, the flow rate decreases and the flow state tends to be stable, creating conditions for natural separation based on density. High-activity sludge slowly floats due to its small density and the attachment of a small amount of gas, while low-activity sludge quickly settles due to its large density. At the same time, the circular flow generated by the guide plate plays a "washing" role, washing away the flocs or bubbles adhering to the surface of the high-activity sludge, further strengthening the separation effect. This step realizes the initial accurate classification of the sludge group, with the high-activity component being enriched at the liquid surface.

[0033] (4) In the present application, the high-activity granular sludge in the screening module jumps over the partition plate into the stirring and sedimentation module, cleverly utilizing the floating potential energy of high-activity granular sludge, so that it continuously enters the next stirring and sedimentation module with very low energy consumption, and the whole process does not need pumping, avoiding the damage of mechanical shearing to the sludge structure.

[0034] (5) The stirring and sedimentation module of the present application does not perform full-mixing stirring, but precisely breaks the surface tension and the adhesion between bubbles and sludge. After the high-activity sludge floats to the liquid surface, it is often "lifted" by the surface tension or small bubbles and cannot sink. The low-speed surface stirrer gently breaks this balance, allowing the sludge particles to release bubbles and coalesce with each other, increasing the density and thus changing from "floating state" to "sinking state". Then, it sinks in the quiet sedimentation area and is finally accurately recycled through the reflux pipe at the bottom.

[0035] (6) The three-phase separation module of the present application first increases the settling area in a limited space through the baffle plate group based on the shallow pool theory, realizes the terminal fine separation of escaped trace flocs, and ensures the fundamental improvement of the effluent quality. Secondly, the three-phase separation module maintains the stability of the system's internal water force and air pressure through the effluent weir and gas collection hood, creating an optimal working environment for the front-end screening and sedimentation, and playing a key synergistic effect. Most importantly, the three-phase separation module innovatively designs an internal sludge reflux path, allowing the captured sludge to automatically return to the sedimentation area, forming a closed loop of high-value biomass and achieving nearly "zero discharge" efficient recovery. This design, which integrates fine separation, system stability and internal circulation, demonstrates its significant progress and creativity as a customized component.

[0036] (7) The main power of the present application is only used for surface agitator and reflux pump, and both are low-power devices. The gravity flow is used to cross the partition, and no energy consumption is needed. There is no fine filter element in the trapping device, which avoids the risk of blockage, and the operation is extremely reliable, the maintenance is simple, and the overall energy consumption and maintenance cost are greatly reduced. The simplification of this structure and the reduction of energy consumption bring great commercial application advantages to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 Figure 1 is a schematic diagram of the principle of high-activity granular sludge floating on the water surface in an anaerobic ammonia oxidation reactor, (a) high-activity granular sludge standing for 5 min, (b) high-activity granular sludge standing for 30 min, (c) high-activity granular sludge stirring for 5 min, (d) high-activity granular sludge stirring for 30 min; Figure 2 Figure 2 is a structural schematic diagram of the anaerobic ammonia oxidation reactor and the trapping device shown in Example 2.

[0038] Figure 1 is a schematic diagram of the principle of high-activity granular sludge floating on the water surface in an anaerobic ammonia oxidation reactor, (a) high-activity granular sludge standing for 5 min, (b) high-activity granular sludge standing for 30 min, (c) high-activity granular sludge stirring for 5 min, (d) high-activity granular sludge stirring for 30 min; 1-anaerobic ammonia oxidation reactor, 11-outlet pipeline, 12-inlet pipeline, 13-second three-phase separator, 14-second sludge discharge pipe; 2-trapping device; 21-screening module, 211-guide plate, 212-sample inlet pipe, 2121-pipeline, 2122-sample inlet valve, 213-first sludge discharge pipe; 22-stirring and sedimentation module, 221-surface agitator, 222-reflux pipe, 223-reflux pump; 23-partition; 24-three-phase separation module, 241-gas collection hood, 242-baffle group. DETAILED DESCRIPTION

[0039] The present application will be described in detail below in conjunction with the drawings and specific embodiments. The embodiments are implemented on the premise of the technical solution of the present application, and detailed implementation modes and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments. In the following embodiments or examples, if there is no special description of the function components or structures, it means that they are all conventional components or conventional structures adopted in the field to realize the corresponding functions.

[0040] It should be noted that in the description of the present application, the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] A high-activity granular sludge trapping device for connecting with an anaerobic ammonia oxidation reactor 1, the trapping device 2 comprising: A screening module 21 arranged at the bottom of the trapping device 2, receiving and screening the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1, so that the high-activity granular sludge floats to the top of the screening module 21 and the low-activity granular sludge sinks to the bottom of the screening module 21; A stirring and sedimentation module 22 arranged side by side with the screening module 21 at the bottom of the trapping device 2, the high-activity granular sludge after stirring sinks to the bottom and returns to the anaerobic ammonia oxidation reactor 1; And a partition plate 23 arranged between and separating the screening module 21 and the stirring and sedimentation module 22, the height of the partition plate 23 is arranged to make the high-activity granular sludge of the screening module 21 jump over and enter the stirring and sedimentation module 22.

[0043] In some specific embodiments, a plurality of guide plates 211 are arranged in the screening module 21. The screening module 21 of the trapping device 2 can further screen the high-activity granular sludge, the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1 is not all high-activity granular sludge, so further screening is needed, the guide plates 211 of the screening module 21 make the high-activity granular sludge float over the partition plate 23 and enter the stirring and sedimentation module 22, while the low-activity granular sludge sinks to the bottom of the screening module 21 and is emptied after reaching a certain amount.

[0044] In some specific embodiments, the flow guide plate 211 is inclined or vertically arranged in the screening module 21. And / or, the flow guide plate 211 is a perforated plate or a grating plate.

[0045] In some specific embodiments, the screening module 21 further comprises a sample inlet pipe 212 connected with the effluent pipe 11 of the ANAMMOX reactor 1, and a first sludge discharge pipe 213 at the bottom of the screening module 21 for discharging low-activity granular sludge.

[0046] In some specific embodiments, the first sludge discharge pipe 213 is provided with a sludge discharge valve.

[0047] In some specific embodiments, the sample inlet pipe 212 is connected with the effluent pipe 11 of the ANAMMOX reactor 1 through a pipeline 2121, and an inlet valve 2122 is arranged therebetween.

[0048] In some specific embodiments, the height of the sample inlet pipe 212 is lower than that of the effluent pipe 11 of the ANAMMOX reactor 1, and the sample inlet pipe 212 is located at the lower part of the screening module 21, so that the ANAMMOX granular sludge floating on the water surface in the ANAMMOX reactor 1 flows into the lower part of the screening module 21 of the trapping device 2 by gravity.

[0049] In some specific embodiments, a surface agitator 221 is arranged at the top of the stirring and precipitation module 22, which only agitates the liquid surface or surface layer area of the stirring and precipitation module 22; the surface agitator 221 is one of a surface turbine agitator, a surface scraper agitator or a low-speed pusher.

[0050] In some specific embodiments, the surface agitator can be installed through a truss structure or the like without affecting the high-activity granular sludge in the screening module to jump over the partition plate and enter the stirring and precipitation module.

[0051] In some specific embodiments, the rotating speed of the surface agitator 221 is 10-30 r / min, preferably about 15-25 r / min.

[0052] In some specific embodiments, the height of the trapping device 1 is 1.2-1.5 m, and the height of the screening module 21 and the stirring and sedimentation module 22 is 45%-55% of the height of the trapping device 1. The height of the partition 23 is about 1 / 2-3 / 4 of the effective water depth. The surface stirrer 221 only stirs the liquid surface or surface layer area of the stirring and sedimentation module 22, and the trapping device 2 has a high height. After stirring, the nitrogen gas produced by the high-activity granular sludge is separated from it and released, and the high-activity granular sludge can be precipitated in the middle and lower part of the stirring and sedimentation module 22 without being affected by the upper stirring. Thus, a larger water volume can be treated continuously for a period of time.

[0053] In some specific embodiments, the stirring and sedimentation module 22 comprises a stirring area at the upper part and a sedimentation area at the lower part, and the surface stirrer 221 is located in the stirring area to stir the liquid surface or surface layer area to destroy the surface tension of the high-activity granular sludge and its adhesion to the gas bubbles, and the stirred high-activity granular sludge is precipitated in the sedimentation area.

[0054] In some specific embodiments, the stirring and sedimentation module 22 is further provided with a reflux pipe 222 connected to the influent pipe 12 of the ANAMMOX reactor 1, and a reflux pump 223 is arranged on the reflux pipe 222. The high-activity granular sludge after stirring is precipitated to the bottom of the stirring and sedimentation module 22, and is pumped into the influent pipe 12 of the ANAMMOX reactor 1 by the reflux pump 223, and enters the ANAMMOX reactor 1 together with the influent.

[0055] In some specific embodiments, a reflux valve is arranged on the reflux pipe 222.

[0056] The high-activity granular sludge trapping device 1 is a device independent of the ANAMMOX reactor 1, which does not affect the reaction inside the original ANAMMOX reactor 1, and the ANAMMOX reactor 1 runs well. When there is no floating granular sludge on the water surface, the sampling valve 2122 and the reflux valve can be closed, and the operation of the high-activity granular sludge trapping device can be stopped, thereby saving energy consumption.

[0057] In some specific embodiments, the trapping device 2 further comprises a three-phase separation module 24 arranged above the screening module 22 and the stirring and sedimentation module 23.

[0058] In some specific embodiments, the three-phase separation module 24 is a first three-phase separator, which comprises: a gas collection hood 241 for collecting biogas; a water outlet weir arranged on one side or around the gas collection hood 241 and used for discharging clean water; and a baffle group 242 arranged below the gas collection hood 241.

[0059] A high-activity granular sludge capturing method, which is implemented by using a high-activity granular sludge capturing device, comprises the following steps: S1, introducing the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1 into the screening module 21; S2, in the screening module 21, using gravity sedimentation and flotation to screen, so that the high-activity granular sludge floats to the top of the screening module 21, and the low-activity granular sludge sinks to the bottom of the screening module 21; S3, making the high-activity granular sludge enriched in the upper part of the screening module 21 jump over the partition plate 23 and enter the stirring sedimentation module 22 adjacent thereto; S4, in the stirring sedimentation module 22, stirring the liquid surface or surface layer to destroy the surface tension of the high-activity granular sludge and its adhesion to the bubbles, and promoting its sedimentation; S5, returning the high-activity granular sludge settled to the bottom of the stirring sedimentation module 22 to the anaerobic ammonia oxidation reactor 1.

[0060] An anaerobic ammonia oxidation reactor comprising the high-activity granular sludge capturing device.

[0061] In some specific embodiments, the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1 is located at the upper part, and the influent pipe 12 is located at the lower part.

[0062] In some specific embodiments, a second three-phase separator 11 is arranged above the anaerobic ammonia oxidation reactor 1.

[0063] In some specific embodiments, the anaerobic ammonia oxidation reactor 1 is provided with a second sludge discharge pipe 14.

[0064] In some specific embodiments, a screen is arranged at the effluent outlet of the anaerobic ammonia oxidation reactor connected to the next reactor, to intercept the anaerobic ammonia oxidation granular sludge floating on the water surface, so as to avoid the concentration of suspended solids in the effluent exceeding the standard and the loss of high-activity anaerobic ammonia oxidation granular sludge.

[0065] wherein, Figure 1 The principle of the high-activity granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor is explained, Figure 1 (a) represents the original state of the sludge, the upper part is high-activity granular sludge, and the lower part is ordinary active sludge; Figure 1 (b) represents that after a period of time, the ordinary active sludge in the lower part settles and becomes smaller in volume, while the high-activity granular sludge in the upper part does not settle; Figure 1 (c) and (d) represent that after stirring the high-activity granular sludge, the high-activity granular sludge settles.

[0066] The above embodiments can be implemented individually or in any combination of two or more.

[0067] The following will be described in conjunction with specific embodiments.

[0068] Embodiment 1 A high-activity granular sludge trapping device for connecting with an anaerobic ammonia oxidation reactor 1, the trapping device 2 comprising: A screening module 21 arranged at the bottom of the trapping device 2, receiving and screening the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1, so that the high-activity granular sludge floats to the top of the screening module 21 and the low-activity granular sludge sinks to the bottom of the screening module 21; A stirring and sedimentation module 22 arranged side by side with the screening module 21 at the bottom of the trapping device 2, the stirred high-activity granular sludge sinking to the bottom and returning to the anaerobic ammonia oxidation reactor 1; And a partition plate 23 arranged between and separating the screening module 21 and the stirring and sedimentation module 22, the height of the partition plate 23 being arranged to allow the high-activity granular sludge of the screening module 21 to jump over and enter the stirring and sedimentation module 22.

[0069] In this embodiment, the screening module 21 is provided with a plurality of guide plates 211. The screening module 21 of the trapping device 2 can further screen the high-activity granular sludge. The anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1 is not all high-activity granular sludge, so further screening is required. The guide plates 211 of the screening module 21 allow the high-activity granular sludge to float over the partition plate 23 and enter the stirring and sedimentation module 22, while the low-activity granular sludge sinks to the bottom of the screening module 21 and is emptied after reaching a certain amount.

[0070] In this embodiment, the guide plates 211 are arranged as perforated plates (material 304 / 316 stainless steel) arranged at an interval of 80 mm in parallel, with the plates being installed at an inclination (inclination angle 15°), and with a single hole width of 8 mm. The top of the plate is kept 10 cm away from the liquid surface to facilitate the enrichment of the floating layer and facilitate self-cleaning and maintenance.

[0071] In this embodiment, the screening module 21 further comprises a sample inlet pipe 212 connected with the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1, and a first sludge discharge pipe 213 located at the bottom of the screening module 21 for discharging low-activity granular sludge. The first sludge discharge pipe 213 is provided with a sludge discharge valve.

[0072] In this embodiment, the sample inlet pipe 212 is connected with the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1 through a pipe 2121, with a sample inlet valve 2122 arranged therebetween.

[0073] In the embodiment, the height of the sampling pipe 212 is lower than the effluent pipe 11 of the ANAMMOX reactor 1, and the sampling pipe 212 is located at the lower part of the screening module 21, so that the ANAMMOX granular sludge floating on the water in the ANAMMOX reactor 1 flows into the lower part of the screening module 21 of the trapping device 2 by gravity.

[0074] In the embodiment, the surface agitator 221 is arranged at the top of the stirring and precipitation module 22, and the surface agitator 221 only agitates the liquid surface or surface layer area of the stirring and precipitation module 22; the surface agitator 221 is a surface layer turbine agitator.

[0075] In the embodiment, the rotating speed of the surface agitator 221 is 20 r / min, and the paddle of the surface agitator 221 is immersed in the liquid surface by about 5 cm.

[0076] In the embodiment, the height of the trapping device 1 is 1.2 m, and the height of the screening module 21 and the stirring and precipitation module 22 is 50% of the height of the trapping device 1. The height of the partition plate 23 is about 2 / 3 of the effective water depth. The surface agitator 221 only agitates the liquid surface or surface layer area of the stirring and precipitation module 22, and the trapping device 2 has a high height, so that the nitrogen gas produced by the high-activity granular sludge is separated from the high-activity granular sludge after stirring and released, and the high-activity granular sludge can be precipitated in the middle and lower part of the stirring and precipitation module 22 without being affected by the upper agitation, so that a large amount of water can be treated for a long time.

[0077] In the embodiment, the stirring and precipitation module 22 includes a stirring area at the upper part and a precipitation area at the lower part, and the surface agitator 221 is located in the stirring area and agitates the liquid surface or surface layer area to destroy the surface tension of the high-activity granular sludge and the adhesion of the high-activity granular sludge to the bubbles, and the high-activity granular sludge after stirring is precipitated in the precipitation area.

[0078] In the embodiment, the stirring and precipitation module 22 further includes a backflow pipe 222 connected to the water inlet pipe 12 of the ANAMMOX reactor 1, and a backflow pump 223 is arranged on the backflow pipe 222. The high-activity granular sludge after stirring is precipitated to the bottom of the stirring and precipitation module 22, and the backflow pump 223 is used to pump the high-activity granular sludge into the water inlet pipe 12 of the ANAMMOX reactor 1, so that the high-activity granular sludge enters the ANAMMOX reactor 1 together with the water.

[0079] In the embodiment, a backflow valve is arranged on the backflow pipe 222.

[0080] The high-activity granular sludge trapping device 1 is independent of the anaerobic ammonia oxidation reactor 1, does not affect the reaction inside the original anaerobic ammonia oxidation reactor 1, and the anaerobic ammonia oxidation reactor 1 runs well. When there is no floating granular sludge on the water surface, the sampling valve 2122 and the backflow valve can be closed, and the operation of the high-activity granular sludge trapping device can be stopped, thereby saving energy consumption.

[0081] An anaerobic ammonia oxidation reactor comprising the high-activity granular sludge trapping device.

[0082] In this embodiment, the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1 is located at the upper part, and the influent pipe 12 is located at the lower part.

[0083] In this embodiment, the anaerobic ammonia oxidation reactor 1 is provided with a second three-phase separator 11 at the upper part.

[0084] In this embodiment, the anaerobic ammonia oxidation reactor 1 is provided with a second sludge discharge pipe 14.

[0085] A high-activity granular sludge trapping method using the high-activity granular sludge trapping device, comprising the following steps: S1, connecting the anaerobic ammonia oxidation reactor 1 with the trapping device 2, opening the sampling valve 2122 on the pipe 2121 connecting the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1 with the bottom sampling pipe 212 of the screening module 21 of the trapping device 2, opening the backflow valve connecting the influent pipe 12 of the anaerobic ammonia oxidation reactor 1 with the backflow pipe 222 of the stirring and precipitation module 22 of the trapping device 2, and opening the backflow pump 233.

[0086] S2, the effluent of the anaerobic ammonia oxidation reactor 1 enters the screening module 21 under the action of gravity. The anaerobic ammonia oxidation granular sludge floating on the water surface and a small amount of sludge (mainly low-activity sludge) enter together with the effluent.

[0087] S3, the influent impacts the vertically arranged flow guide plate 211 in the screening module 1, the direction of the water flow changes, the kinetic energy is weakened, and a gentle circular flow is formed behind the flow guide plate 211. Under this hydraulic condition, the screening process based on the density difference occurs: The high-activity granular sludge, which usually has a density less than 1.05 g / cm³ and often contains micro-bubbles inside, slowly floats up under the action of buoyancy and gradually accumulates in the upper part of the liquid surface of the screening module 21; The low-activity granular sludge and inorganic impurities, which have a larger density, quickly settle to the bottom of the screening module 21.

[0088] S4, periodically, for example, every 8 hours, open the sludge discharge valve on the first sludge discharge pipe 213 at the bottom of the screening module 21 to discharge the accumulated low-activity granular sludge and inorganic impurities, preventing their accumulation.

[0089] S5, the high-activity granular sludge layer enriched at the liquid surface of the screening module 21 thickens continuously, and when the liquid surface height exceeds the top of the partition 23, the high-activity granular sludge naturally jumps over the partition 23 and enters the adjacent stirring and sedimentation module 22. This process relies on gravity flow and does not require additional power, achieving continuous and stable transfer of high-activity granular sludge.

[0090] S6, the surface stirrer 221 at the top of the stirring and sedimentation module 22 is started, and the stirrer 6 only performs mild stirring at the liquid surface or surface layer area. Its core function is to break the surface tension between the high-activity sludge particles and the liquid surface, and to remove the tiny bubbles adhering to the surface of the sludge through slight hydraulic shear, eliminating the source of buoyancy. After this treatment, the high-activity sludge particles are stripped of bubbles, agglomerate into larger flocs, and increase in density, thereby stopping floating and starting to slowly settle in the static sedimentation zone.

[0091] S7, the concentrated high-activity sludge particles that have settled to the bottom of the sedimentation zone are sent back to the influent pipe 12 of the anaerobic ammonia oxidation reactor 1 through the backflow pipe 222 and the backflow pump 223, and after mixing with fresh wastewater, they re-enter the anaerobic ammonia oxidation reactor 1.

[0092] S8, if the anaerobic ammonia oxidation reactor 1 is running well and there is no floating granular sludge on the water surface, the sampling valve 2122 and the backflow valve are closed to stop running and save energy.

[0093] The trapping device 2 realizes efficient and precise recovery and reuse of high-activity granular sludge in the effluent of the anaerobic ammonia oxidation reactor 1 through the continuous process of "hydraulic screening-gravity jumping-surface stirring-sedimentation backflow", ensuring stable operation of the anaerobic ammonia oxidation reactor 1 and good effluent quality.

[0094] Example 2 As shown in the drawings, a high-activity granular sludge trapping device is used in conjunction with an anaerobic ammonia oxidation reactor 1. The trapping device 2 includes: Figure 2 A screening module 21 is provided at the bottom of the trapping device 2 to receive and screen the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1, so that the high-activity granular sludge floats to the top of the screening module 21 and the low-activity granular sludge sinks to the bottom of the screening module 21. A stirring and sedimentation module 22 is provided side by side with the screening module 21 at the bottom of the trapping device 2. The high-activity granular sludge after stirring sinks to the bottom and returns to the anaerobic ammonia oxidation reactor 1. A stirring and sedimentation module 22 is provided side by side with the screening module 21 at the bottom of the trapping device 2. The high-activity granular sludge after stirring sinks to the bottom and returns to the anaerobic ammonia oxidation reactor 1. and a partition 23 arranged between and separating the screening module 21 and the stirring and sedimentation module 22, the height of the partition 23 being arranged such that the high-activity granular sludge of the screening module 21 surmounts and enters the stirring and sedimentation module 22.

[0095] In this embodiment, the screening module 21 is provided with a plurality of flow guides 211. The screening module 21 of the trapping device 2 can further screen the high-activity granular sludge. The anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1 is not all high-activity granular sludge, and thus needs to be further screened. The flow guides 211 of the screening module 21 are arranged such that the high-activity granular sludge surmounts and floats to enter the stirring and sedimentation module 22, while the low-activity granular sludge sinks to the bottom of the screening module 21 and is emptied after reaching a certain amount.

[0096] In this embodiment, the flow guides 211 are arranged as perforated plates (304 / 316 stainless steel) arranged in parallel at an interval of 80 mm, with the plates being installed vertically, a single hole being 8 mm wide, and the top of the plate being 10 cm away from the liquid surface to facilitate the enrichment of the floating layer and facilitate self-cleaning and maintenance.

[0097] In this embodiment, the screening module 21 further comprises a sampling pipe 212 connected to the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1, and a first sludge discharge pipe 213 located at the bottom of the screening module 21 for discharging low-activity granular sludge. The first sludge discharge pipe 213 is provided with a sludge discharge valve.

[0098] In this embodiment, the sampling pipe 212 is connected to the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1 through a pipeline 2121, with a sampling valve 2122 arranged therebetween.

[0099] In this embodiment, the height of the sampling pipe 212 is lower than that of the effluent pipe 11 of the anaerobic ammonia oxidation reactor 1, and the sampling pipe 212 is located at the lower part of the screening module 21, so that the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor 1 flows into the lower part of the screening module 21 of the trapping device 2 by gravity.

[0100] In this embodiment, the stirring and sedimentation module 22 is provided at the top with a surface stirrer 221 that only stirs the liquid surface or surface layer area of the stirring and sedimentation module 22; the surface stirrer 221 is a surface turbine stirrer.

[0101] In this embodiment, the surface stirrer 221 has a rotation speed of 20 r / min, and the paddle thereof is immersed in the liquid surface by about 10 cm.

[0102] In the embodiment, the height of the capturing device 1 is 1.5 m, the height of the screening module 21 and the stirring and sedimentation module 22 is 50% of the height of the capturing device 1. The height of the partition 23 is about 2 / 3 of the effective water depth. The surface stirrer 221 only stirs the liquid surface or surface layer area of the stirring and sedimentation module 22, and the capturing device 2 has a high height, so that the nitrogen produced by the high-activity granular sludge after stirring is separated from the high-activity granular sludge and released, and the high-activity granular sludge can be precipitated in the middle and lower part of the stirring and sedimentation module 22 without being affected by the upper stirring, so that a large amount of water can be treated continuously for a long time.

[0103] In the embodiment, the stirring and sedimentation module 22 includes a stirring area at the upper part and a sedimentation area at the lower part, and the surface stirrer 221 is located in the stirring area to stir the liquid surface or surface layer area to destroy the surface tension of the high-activity granular sludge and the adhesion of the high-activity granular sludge to the bubbles, and the high-activity granular sludge after stirring is precipitated in the sedimentation area.

[0104] In the embodiment, the stirring and sedimentation module 22 is further provided with a reflux pipe 222 connected with the water inlet pipe 12 of the ANAMMOX reactor 1, and the reflux pipe 222 is provided with a reflux pump 223. The high-activity granular sludge after stirring is precipitated to the bottom of the stirring and sedimentation module 22, and is pumped into the water inlet pipe 12 of the ANAMMOX reactor 1 by the reflux pump 223, and enters the ANAMMOX reactor 1 together with the water.

[0105] In the embodiment, the reflux pipe 222 is provided with a reflux valve.

[0106] The high-activity granular sludge capturing device 1 is a device independent of the ANAMMOX reactor 1, and does not affect the reaction in the ANAMMOX reactor 1. When the water surface of the ANAMMOX reactor 1 is free of floating granular sludge, the sampling valve 2122 and the reflux valve can be closed, and the operation of the high-activity granular sludge capturing device can be stopped, thereby saving energy consumption.

[0107] In the embodiment, the capturing device 2 further includes a three-phase separation module 24 arranged above the screening module 22 and the stirring and sedimentation module 23.

[0108] In the embodiment, the three-phase separation module 24 is a first three-phase separator, which includes: a gas collecting hood 241 for collecting biogas; a water outlet weir arranged on one side or around the gas collecting hood 241 and used for discharging clean water; and a baffle group 242 arranged below the gas collecting hood 241.

[0109] An ANAMMOX reactor including the high-activity granular sludge capturing device.

[0110] In this embodiment, the effluent pipe 11 of the ANAMMOX reactor 1 is located at the upper part, and the influent pipe 12 is located at the lower part.

[0111] In this embodiment, a second three-phase separator 11 is arranged above the ANAMMOX reactor 1.

[0112] In this embodiment, the ANAMMOX reactor 1 is provided with a second sludge discharge pipe 14.

[0113] A high-activity granular sludge trapping method, which is implemented by using the high-activity granular sludge trapping device, comprises the following steps: S1, connecting the ANAMMOX reactor 1 with the trapping device 2, opening the sampling valve 2122 on the pipe 2121 connecting the effluent pipe 11 of the ANAMMOX reactor 1 with the bottom sampling pipe 212 of the screening module 21 of the trapping device 2, opening the reflux valve between the influent pipe 12 of the ANAMMOX reactor 1 and the reflux pipe 222 of the stirring and precipitation module 22 of the trapping device 2, and opening the reflux pump 233.

[0114] S2, the effluent of the ANAMMOX reactor 1 enters the screening module 21 under the action of gravity. The ANAMMOX granular sludge floating on the water surface and a small amount of sludge (mainly low-activity sludge) enter together with the effluent.

[0115] S3, the influent impacts the vertically arranged flow guide plate 211 in the screening module 1, the direction of the water flow changes, the kinetic energy is weakened, and a gentle circular flow is formed behind the flow guide plate 211. Under this hydraulic condition, the screening process based on the density difference occurs: The high-activity granular sludge, which usually has a density less than 1.05 g / cm³ and often contains micro-bubbles inside, slowly floats up under the action of buoyancy and gradually accumulates in the upper part of the liquid surface of the screening module 21; The low-activity granular sludge and inorganic impurities, which have a larger density, quickly settle to the bottom of the screening module 21.

[0116] S4, the sludge valve on the first sludge discharge pipe 213 at the bottom of the screening module 21 is opened periodically, for example, every 8 hours, to discharge the accumulated low-activity granular sludge and inorganic impurities, preventing their accumulation.

[0117] S5, the high-activity granular sludge layer accumulated on the liquid surface of the screening module 21 continues to thicken, and when the liquid surface height exceeds the top of the partition plate 23, the high-activity granular sludge naturally jumps over the partition plate 23 and enters the adjacent stirring and precipitation module 22. This process relies on gravity flow and does not require additional power, realizing the continuous and stable transfer of high-activity granular sludge.

[0118] S6. Activate the surface agitator 221 at the top of the stirring and settling module 22. The agitator 6 only performs gentle stirring on the liquid surface or surface area. Its core function is to break the surface tension between the highly active sludge particles and the liquid surface, and through slight hydraulic shearing, peel off the tiny air bubbles adhering to the sludge surface, eliminating its buoyancy source. After this treatment, the highly active sludge particles are free of air bubbles, aggregate into larger flocs, increase in density, and thus stop floating, beginning to slowly settle in the static settling zone.

[0119] S7. The concentrated, highly active sludge particles that settle to the bottom of the sedimentation zone are sent back to the inlet pipe 12 of the anaerobic ammonia oxidation reactor 1 through the bottom return pipe 222 and return pump 223. After mixing with fresh wastewater, they re-enter the anaerobic ammonia oxidation reactor 1.

[0120] S8. The supernatant from the stirred sedimentation module 22 overflows upwards into the three-phase separation module 24, passing through a baffle assembly 242 composed of multiple parallel inclined plates. Any trace bubbles that may be carried are collected by the gas collection hood 241 and discharged. Finally, the clear treated water overflows evenly through the surrounding sawtooth-shaped effluent weir, and the effluent SS is discharged stably at a low concentration, effectively solving the problem of sludge loss.

[0121] S9. If the anaerobic ammonia oxidation reactor 1 is operating well and there is no floating granular sludge on the water surface, close the inlet valve 2122 and the reflux valve to stop operation and save energy.

[0122] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A highly active granular sludge collection device, characterized in that, For connection to the anaerobic ammonia oxidation reactor (1), the collection device (2) includes: The screening module (21) set at the bottom of the collection device (2) receives the anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor (1) and screens it, so that the highly active granular sludge floats to the top of the screening module (21) and the low-activity granular sludge sinks to the bottom of the screening module (21). The stirring sedimentation module (22) is arranged side by side with the screening module (21) at the bottom of the collection device (2). The highly active granular sludge after stirring settles to the bottom and is returned to the anaerobic ammonia oxidation reactor (1). And a partition (23) is provided between and separates the screening module (21) and the stirred sedimentation module (22), the height of which is set so that the highly active granular sludge of the screening module (21) can be turned over into the stirred sedimentation module (22).

2. The highly active granular sludge collection device according to claim 1, characterized in that, The screening module (21) is equipped with several guide plates (211).

3. The highly active granular sludge collection device according to claim 2, characterized in that, The guide plate (211) is inclined or vertically arranged inside the screening module (21); And / or, the guide plate (211) is a perforated plate or a grid plate.

4. The highly active granular sludge collection device according to claim 2, characterized in that, The screening module (21) also includes an inlet pipe (212) connected to the effluent pipe (11) of the anaerobic ammonia oxidation reactor (1), and a first sludge discharge pipe (213) located at the bottom of the screening module (21) for discharging low-activity particulate sludge.

5. The highly active granular sludge collection device according to claim 1, characterized in that, The top of the stirring sedimentation module (22) is provided with a surface agitator (221), which is one of a surface turbine agitator, a surface scraper agitator, or a low-speed propeller.

6. The highly active granular sludge collection device according to claim 5, characterized in that, The bottom of the stirring sedimentation module (22) is also provided with a return pipe (222) connected to the water inlet pipe (12) of the anaerobic ammonia oxidation reactor (1), and a return pump (223) is provided on the return pipe (222).

7. The highly active granular sludge collection device according to claim 1, characterized in that, The collection device (2) also includes a three-phase separation module (24) disposed above the screening module (22) and the stirring sedimentation module (23).

8. The highly active granular sludge collection device according to claim 7, characterized in that, The three-phase separation module (24) is the first three-phase separator, comprising: Gas collection hood (241) for collecting biogas; A water outlet weir located on or around the gas collection hood (241) and used to discharge clean water; And the baffle assembly (242) located below the gas collection hood (241).

9. A method for collecting highly active granular sludge, characterized in that, It is implemented using a highly active granular sludge collection device as described in any one of claims 1 to 8, and includes the following steps: S1. The anaerobic ammonia oxidation granular sludge floating on the water surface in the anaerobic ammonia oxidation reactor (1) is introduced into the screening module (21). S2. In the screening module (21), gravity settling and flotation are used for screening, so that the high-activity granular sludge floats to the top of the screening module (21) and the low-activity granular sludge sinks to the bottom of the screening module (21). S3. The highly active granular sludge enriched in the upper part of the screening module (21) is flipped over the partition (23) and enters the adjacent stirring and sedimentation module (22). S4. In the stirring and settling module (22), the liquid surface or surface area is stirred to break the surface tension of the highly active granular sludge and its adhesion to air bubbles, thereby promoting its settling. S5. The highly active granular sludge that has settled to the bottom of the stirred sedimentation module (22) is returned to the anaerobic ammonia oxidation reactor (1).

10. An anaerobic ammonia oxidation reactor, characterized in that, It includes a highly active granular sludge collection device as described in any one of claims 1 to 8.

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