Anaerobic ammonia oxidation film biological method and reactor

Abstract

The invention discloses an anaerobic ammonia oxidation membrane biological method and a reactor, and relates to the technical field of sewage treatment.The reaction method comprises the steps that S1, anaerobic ammonia oxidation sludge is inoculated; s2, injecting domestic sewage; s3, domesticating anaerobic ammonium oxidation bacteria; and S4, carrying out intermittent aeration. And stable supply of nitrite in the partial nitrification / anaerobic ammonia oxidation process is realized through intermittent aeration. The reactor comprises a water inlet device, a reactor main body, a membrane assembly, an aeration assembly and a water outlet device, the water inlet device is communicated with the reactor main body, the membrane assembly is arranged in the reactor main body, the membrane assembly comprises a membrane frame and a micro-filtration membrane, the micro-filtration membrane wraps the membrane frame and surrounds to form a filter space, and the filter space is communicated with the water outlet device. The membrane component is used for discharging water, and the micro-filtration membrane has a small pore size, so that microbial sludge can be intercepted in the reactor, sludge-water separation is realized, anaerobic ammonia oxidation sludge in a reaction system cannot be reduced due to water discharging, and 100% of biomass is reserved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an anaerobic ammonia oxidation membrane biological method and a reactor. Background Art

[0002] Worldwide, the discharge of nitrogen-containing sewage can cause eutrophication of water bodies, which has serious impacts on natural ecosystems and human health. In terms of sewage treatment, sewage treatment plants currently use biological treatment technology for nitrogen-containing sewage, among which nitrification and denitrification have been widely used in traditional sewage treatment plants. However, in the treatment of low C / N sewage, it is necessary to add additional carbon sources and increase the aeration volume, thereby generating additional residual sludge, increasing the cost of operation and management, and being detrimental to the economic benefits of the sewage treatment plant. The anaerobic ammonium oxidation process, a new type of denitrification treatment process, is a process in which anaerobic ammonia-oxidizing bacteria use ammonia nitrogen as an electron donor and nitrite as an electron acceptor to convert nitrogen into nitrogen gas under anaerobic conditions. At present, the anaerobic ammonium oxidation process has been widely used in the denitrification treatment of sidestream wastewater.

[0003] The anaerobic ammonium oxidation process does not require aeration and the addition of additional carbon sources, and the long microbial generation cycle does not produce excessive excess sludge. Integrating the anaerobic ammonium oxidation process into the existing denitrification process can effectively reduce the amount of aeration and carbon source required for the traditional denitrification process, thereby significantly reducing energy consumption and drug addition costs, and can reduce the cost of excess sludge treatment, thereby improving the economic benefits of sewage treatment.

[0004] However, the nitrite competition problem in the anaerobic ammonium oxidation process is not conducive to the denitrification efficiency of anaerobic ammonium oxidation, so a measure is needed to solve this problem. Summary of the invention

[0005] The object of the present invention is to provide an anaerobic ammonium oxidation membrane bioreactor method and a reactor to solve the problems existing in the above-mentioned prior art and achieve a stable supply of nitrite in the anaerobic ammonium oxidation process.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An anaerobic ammonium oxidation membrane biological reaction method comprises the following steps:

[0008] S1. Inoculating anaerobic ammonium oxidation sludge in the reactor body;

[0009] S2. Injecting domestic sewage into the reactor body;

[0010] S3. Domestication of anaerobic ammonium oxidizing bacteria;

[0011] S4. Intermittent aeration is performed inside the reactor body to control the dissolved oxygen content in the reactor body to be no greater than the oxygen content required for converting ammonia nitrogen into nitrous acid.

[0012] In an exemplary embodiment, in S3, the initial influent NH 4 + 60±5mg / L, NO 2 - is 90±5mg / L, increasing the influent NH 4 + and NO 2 - Concentration, first stage influent NH 4 + 60±5mg / L, NO 2 - The second stage influent NH 4 + 90±5mg / L, NO 2 - The influent NH in the third stage is 120±5mg / L, and the operation time is 14-16 days. 4 + 90±5mg / L, NO 2 - 120±5mg / L, running for 14-16 days; influent NH 4 + 150±5mg / L, NO 2 - It is 200±5mg / L, the operating time is 30-40 days, and the entire acclimatization process is 90-95 days.

[0013] In an exemplary embodiment, in S4, the aeration time is 4-5s, the stop time is 60-65s, and the dissolved oxygen in the water is controlled to be ≤0.5mg / L.

[0014] The present invention also provides an anaerobic ammonia oxidation membrane bioreactor for implementing the above-mentioned anaerobic ammonia oxidation membrane biological reaction method, comprising a water inlet device, a reactor body, a membrane assembly, an aeration assembly, a stirring device and a water outlet device, wherein the water inlet device is connected to the reactor body, the membrane assembly is arranged inside the reactor body, the membrane assembly comprises a membrane frame with a filtration space arranged inside and a microfiltration membrane coated outside the membrane frame, the filtration space is connected to the water outlet device; the aeration assembly comprises an oxygen supply source and an aeration pipe connected to the oxygen supply source, and the aeration pipe is connected to the inside of the reactor body.

[0015] In an exemplary embodiment, at least two groups of membrane modules are disposed in the reactor body; the aeration pipe includes an aeration main pipe connected to the oxygen supply source and at least two groups of aeration branch pipes connected to the aeration main pipe, and the aeration branch pipes correspond one to one with the membrane modules.

[0016] In an exemplary embodiment, at least two groups of the membrane modules are evenly arranged in the reactor body.

[0017] In an exemplary embodiment, at least two groups of the stirring devices are evenly arranged in the reactor body.

[0018] In an exemplary embodiment, the water inlet device includes an overflow tank, a water inlet pump is provided between the water storage tank and the overflow tank, and the overflow tank is connected to the reactor body.

[0019] In an exemplary embodiment, the overflow tank is provided with an overflow hole communicating with the outside world;

[0020] A one-way valve is arranged between the overflow tank and the reactor body.

[0021] The water outlet device comprises a water outlet pool communicated with the filtering space, and a water outlet pump is arranged between the water outlet pool and the filtering space.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The anaerobic ammonium oxidation process utilizes ammonia nitrogen and nitrite to produce nitrogen, and the nitrification process utilizes ammonia nitrogen to produce nitrite, and then the nitrite is converted into nitric acid. The present invention uses intermittent aeration to control limited dissolved oxygen, so that the nitrification process can only complete the process of converting ammonia nitrogen into nitrite, reducing the conversion of nitrite into nitric acid, thereby achieving a stable supply of nitrite in the partial nitrification / anaerobic ammonium oxidation process.

[0024] Other technical solutions disclosed in the present invention also have the following technical advantages:

[0025] By designing an aeration tube at the bottom of the reactor column, the reaction in the reactor body can be switched between aerobic and anaerobic conditions while controlling the aeration volume, thereby achieving a stable supply of nitrite.

[0026] The membrane assembly is used for effluent. When effluent is generated, the tiny pore size of the microfiltration membrane can effectively intercept the microbial sludge inside the reactor to achieve sludge-water separation, so that the anaerobic ammonia oxidation sludge in the reaction system will not be reduced due to effluent, thereby achieving 100% retention of biomass. It has a higher anti-pollution load capacity and can be widely used in wastewater denitrification processes such as domestic wastewater and industrial wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 NH during the anaerobic ammonium oxidizing bacteria domestication process in Example 1 of the present invention 4 + and NO 2 - Content and nitrogen removal efficiency data chart;

[0029] Figure 2 This is a schematic structural diagram of an anaerobic ammonium oxidation membrane bioreactor disclosed in Example 2 of the present invention;

[0030] Among them, 1. nitrogen source; 2. water storage tank; 3. water inlet pump; 4. overflow tank; 5. overflow hole; 6. one-way valve; 7. reactor body; 8. pressure detection element; 9. through-plate straight-through connector; 10. water outlet pump; 11. membrane assembly; 12. water outlet tank; 13. oxygen pump; 14. aeration main pipe; 15. aeration branch pipe; 16. stirring device. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. People familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] It should also be noted that in the embodiments of the present application, the same figure mark is used to represent the same component or the same part.

[0034] The purpose of the present invention is to provide an anaerobic ammonium oxidation membrane biological method and a reactor to solve the problems existing in the prior art and achieve a stable supply of nitrite in the anaerobic ammonium oxidation process.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Embodiment 1

[0037] This embodiment provides an anaerobic ammonium oxidation membrane biological reaction method, comprising the following steps:

[0038] S1. Inoculating anaerobic ammonium oxidation sludge in the reactor body 7;

[0039] S2. Injecting domestic sewage into the reactor body 7;

[0040] S3. Domestication of anaerobic ammonium oxidizing bacteria;

[0041] S4. Intermittent aeration is performed inside the reactor body 7.

[0042] Specifically, take the simulation test conducted in the laboratory as an example to illustrate:

[0043] The test water was simulated water, which was prepared according to the common ion concentrations in domestic sewage. 4 + As the main target pollutant, NO 2 - As the electron acceptor in the anaerobic ammonium oxidation process, NaHCO 3 As the carbon source, HCl or NaOH was used to adjust the pH of the inlet water to 7.5±0.2; other trace elements such as Fe, Mn, Zn, Ni, etc. were added to meet the normal metabolism of microorganisms. The simulated water was stored in a 20L water tank 2. Nitrogen was introduced before the experiment to remove the dissolved oxygen in the water body and control DO (English full name: Dissolved Oxygen, Chinese full name: Environmental Monitoring Oxygen Parameter) below 0.5mg / L. To ensure that the reactor was in an anoxic environment, the water tank 2 was equipped with a nitrogen source 1. This experiment used a 30L nitrogen bag.

[0044] The anaerobic ammonium oxidation sludge cultured in the previous stage is inoculated in the reactor body 7, and the sludge is first shaken and then added to the reactor body 7. The inoculated sludge is the bottom sludge in the reactor operating normally in the laboratory, and its MLVSS (English full name: Mixed Liquor Volatile Suspended Solids, Chinese full name: Mixed Liquor Volatile Suspended Solids Concentration) is 3.5g / L, and the inoculation amount is 1 / 5 of the reactor volume. The volume of the reactor used in this experiment is 2.5L, and the inoculation amount of the anaerobic ammonium oxidation sludge is 500mL.

[0045] Inject the configured simulated water into the reactor body 7, and stop the water intake after it is full.

[0046] Acclimation of anaerobic ammonium oxidizing bacteria:

[0047] The inlet flow rate was set to 1.45 mL / min and the outlet flow rate was set to 1.05 mL / min. 4 + 60mg / L, NO 2 - The reactor is calculated from the beginning when it is full, and the inlet and outlet pumps are turned on to start normal operation. 4 + and NO 2 - Concentration, first stage influent NH 4 + 60±5mg / L, NO 2 - The second stage influent NH 4 + 90±5mg / L, NO 2- The influent NH in the third stage is 120±5mg / L, and the operation time is 14-16 days. 4 + 90±5mg / L, NO 2 - 120±5mg / L, running for 14-16 days; influent NH 4 + 150±5mg / L, NO 2 - The NH in the reactor is 200±5mg / L, the operation time is 30-40 days, and the whole acclimatization process is 90-95 days. 4 + 、NO 2 - When the removal flux remains stable, the acclimation is completed.

[0048] The results show:

[0049] like Figure 1 As shown, after 90-95 days of acclimatization, the first stage of water inlet NH 4 + : NO 2 - The nitrogen removal efficiency gradually stabilized, and the highest nitrogen removal efficiency reached 85%, and △NH 4 + With △NO 2 - The ratio stabilized at around 1.21, close to the anaerobic ammonium oxidation reaction ratio of 1.32, so it can be considered that the acclimation of anaerobic ammonium oxidizing bacteria is complete.

[0050] Intermittent Aeration:

[0051] The reactor is aerated by the aeration assembly, and the nitrification zone and the anaerobic ammonia oxidation zone are both located in the reactor body 7. Intermittent aeration is adopted, the aeration time is 4-5s, the stop time is 60-65s, and the dissolved oxygen in the water is controlled to be ≤0.5mg / L. In this embodiment, the aeration time is set to 5s, the stop time is 60s, the gas volume of the oxygen supply source 13 is adjusted to 2.2L / min, and the dissolved oxygen in the water is controlled to be 0.5mg / L.

[0052] The principle of intermittent aeration is that the anaerobic ammonium oxidation process will use ammonia nitrogen and nitrite, and the nitrification process will use ammonia nitrogen to produce nitrite, and then convert nitrite into nitric acid. Through aeration to control the limited dissolved oxygen, the nitrification process can only complete the process of converting ammonia nitrogen into nitrite, reducing the conversion of nitrite to nitric acid, thereby achieving a stable supply of nitrite in the anaerobic ammonium oxidation process. By adjusting the appropriate aeration rate and aeration time, the stable supply of nitrite in the partial nitrification / anaerobic ammonium oxidation process can be achieved.

[0053] When used, nitrogen-containing sewage enters the anaerobic ammonium oxidation reaction zone. Under micro-aerobic conditions, the nitrification reaction converts part of the ammonia nitrogen into nitrite, and the generated nitrite and the remaining ammonia nitrogen undergo anaerobic ammonium oxidation. Intermittent aeration is used to control the dissolved oxygen to ≤0.5mg / L to ensure the stable operation of the nitrification reaction and anaerobic ammonium oxidation process.

[0054] Embodiment 2

[0055] Please refer to Figure 2 The present embodiment provides an anaerobic ammonia oxidation membrane bioreactor for implementing the anaerobic ammonia oxidation membrane bioreactor method of the first embodiment, including a water inlet device, a reactor body 7, a membrane assembly 11, an aeration assembly, a stirring device 16 and a water outlet device, the water inlet device is connected to the reactor body 7, a membrane assembly 11 is arranged inside the reactor body 7, the membrane assembly 11 includes a membrane frame with a filtration space arranged inside and a microfiltration membrane coated outside the membrane frame, and the filtration space is connected to the water outlet device. Microfiltration membrane generally refers to a filtration membrane with a filtration pore size between 0.1-1 microns, which is divided into inorganic membranes and organic polymer membranes according to the membrane-forming material. In the present embodiment, a PVDF membrane with a membrane pore size of 0.1 μm is preferably used. The aeration assembly includes an oxygen supply source 13 and an aeration pipe connected thereto, and the aeration pipe is connected to the inside of the reactor body. The oxygen supply source 13 can be an oxygen supply device such as an oxygen pump and an air compressor.

[0056] Specifically, at least two groups of membrane assemblies 11 are arranged in the reactor body 7, and at least two groups of membrane assemblies 11 are evenly arranged in the reactor body 7. The aeration pipe includes an aeration main pipe 14 and an aeration branch pipe 15, the aeration main pipe 14 is connected to the oxygen supply source 13, and the aeration branch pipe 15 is connected to the aeration main pipe 14. There are also at least two groups of aeration branch pipes 14, which correspond to the membrane assemblies 11 one by one. The switch of the oxygen supply source 13 is connected to the control system signal. Correspondingly, there are also at least two groups of stirring devices 16 in the reactor body 7, which are evenly arranged in the reactor body 7, and are preferably arranged in the middle of the reactor body 7.

[0057] The water inlet device includes an overflow tank 4, which is connected to the reactor body 7. In the experiment of Example 1, a nitrogen source 1 and a water storage tank 2 for configuring simulated water distribution are also used, and an inlet pump 3 is arranged between the water storage tank 2 and the overflow tank 4. The overflow tank 4 is provided with an overflow hole 5 connected to the outside, and a one-way valve 6 is arranged between the overflow tank 4 and the reactor body 7. The water outlet device includes a water outlet tank 12 connected to the filtration space, and a water outlet pump 10 is arranged between the water outlet tank 12 and the filtration space. The water inlet pump 3 and the water outlet pump 10 are preferably peristaltic pumps.

[0058] The working process of this embodiment is as follows: the water in the water storage tank 2 enters the overflow tank 4 through the water inlet pump 3, the water inlet enters the reactor body 7 through the one-way valve 6, and the overflow tank 4 discharges the excess water through the overflow hole 5, so that the liquid level in the reactor body 7 remains stable. The effluent water is discharged through the membrane assembly 11, and there is a hollow filtration space inside the membrane assembly 11. The membrane assembly 11 is immersed in the water body as a whole. The microporous structure of the microfiltration membrane ensures that water can enter the filtration space, while large particles such as sludge cannot pass through. The membrane assembly 11 is connected to the through-plate straight-through joint 9 through a water pipe, and the through-plate straight-through joint 9 is connected to the water outlet pump 10 through a water pipe. The water in the filtration space is pumped out by the suction of the water outlet pump 10, and the pressure detection element 8 is used to monitor the water outlet pressure. The oxygen supply source 13 aerates the reactor through the aeration main pipe 14 and the aeration branch pipe 15.

[0059] Since anaerobic ammonium oxidizing bacteria grow more slowly than other denitrifying microorganisms, the anaerobic ammonium oxidizing reactor has a long operation time, and conventional anaerobic ammonium oxidizing reactors will carry away sludge due to effluent, thereby reducing the anaerobic ammonium oxidizing sludge in the reaction system, and further causing the instability of the system. However, in this embodiment, water is discharged through a microfiltration membrane. When the water is discharged, the tiny pore size of the microfiltration membrane can effectively intercept the microbial sludge inside the reactor, realizing mud-water separation, so that the anaerobic ammonium oxidizing sludge in the reaction system will not be reduced due to effluent, thereby achieving 100% retention of biomass.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0062] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0063] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0064] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0065] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0066] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An anaerobic ammonium oxidation membrane bioreactor method, characterized in that: The following steps are involved: S1. Inoculating anaerobic ammonium oxidation sludge in the reactor body; S2. Injecting domestic sewage into the reactor body; S3. Domestication of anaerobic ammonium oxidizing bacteria; S4. Intermittent aeration is performed inside the reactor body to control the dissolved oxygen content in the reactor body to be no greater than the oxygen content required for converting ammonia nitrogen into nitrous acid.

2. The anaerobic ammonium oxidation membrane bioreactor method according to claim 1, characterized in that: In S3, the initial influent NH4 + 60±5mg / L, NO2 - 90±5mg / L, increasing the influent NH4 + and NO2 - Concentration, first stage influent NH4 + 60±5mg / L, NO2 - 90±5mg / L, operation time is 16-20 days; Second stage influent NH4 + 90±5mg / L, NO2 - 120±5mg / L, operation time is 14-16 days; in the third stage, NH4 + 90±5mg / L, NO2 - 120±5mg / L, running for 14-16 days; influent NH4 in the fourth stage + 150±5mg / L, NO2 - It is 200±5mg / L, the operating time is 30-40 days, and the entire acclimatization process is 90-95 days.

3. The anaerobic ammonium oxidation membrane bioreactor method according to claim 1, characterized in that: In S4, the aeration time is 4-5s, the stop time is 60-65s, and the dissolved oxygen in the water is controlled to be ≤0.5mg / L.

4. An anaerobic ammonium oxidation membrane bioreactor for implementing the anaerobic ammonium oxidation membrane bioreactor method according to any one of claims 1 to 3, characterized in that: The invention comprises a water inlet device, a reactor body, a membrane assembly, an aeration assembly, a stirring device and a water outlet device, wherein the water inlet device is communicated with the reactor body, the membrane assembly is arranged inside the reactor body, the membrane assembly comprises a membrane frame with a filtration space arranged inside and a microfiltration membrane coated outside the membrane frame, the filtration space is communicated with the water outlet device; the aeration assembly comprises an oxygen supply source and an aeration pipe communicated with the oxygen supply source, and the aeration pipe is communicated with the inside of the reactor body.

5. The anaerobic ammonium oxidation membrane bioreactor according to claim 4, characterized in that: At least two groups of membrane modules are arranged in the reactor body; the aeration pipe comprises an aeration main pipe connected to the oxygen supply source and at least two groups of aeration branch pipes connected to the aeration main pipe, and the aeration branch pipes correspond to the membrane modules one by one.

6. The anaerobic ammonium oxidation membrane bioreactor according to claim 5, characterized in that: At least two groups of the membrane modules are evenly arranged in the reactor body.

7. The anaerobic ammonium oxidation membrane bioreactor according to claim 4, characterized in that: At least two groups of the stirring devices are evenly arranged in the reactor body.

8. The anaerobic ammonium oxidation membrane bioreactor according to claim 4, characterized in that: The water inlet device comprises an overflow tank, a water inlet pump is arranged between the water storage tank and the overflow tank, and the overflow tank is connected to the reactor body.

9. The anaerobic ammonium oxidation membrane bioreactor according to claim 8, characterized in that: The overflow tank is provided with an overflow hole communicating with the outside world; A one-way valve is arranged between the overflow tank and the reactor body.

10. The anaerobic ammonium oxidation membrane bioreactor according to claim 4, characterized in that: The water outlet device comprises a water outlet pool communicated with the filtering space, and a water outlet pump is arranged between the water outlet pool and the filtering space.

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