Anaerobic membrane bioreactor coupled with anammox for biological denitrification and energy production system

Abstract

The application discloses an anaerobic membrane bioreactor coupled with a biological denitrification energy production system of wastewater anaerobic ammonia oxidation, which comprises an anaerobic membrane bioreactor, a semi-short-cut nitrification reactor and an anaerobic ammonia oxidation reactor. The anaerobic membrane bioreactor produces methane through an anaerobic digestion reaction, provides ammonia nitrogen for a denitrification process through an ammoniation reaction, realizes deep denitrification and decarburization through a denitrification reaction, and intercepts particulate organic matter in wastewater through a membrane assembly; the semi-short-cut nitrification reactor controls the ammonia oxidation degree to be 50-57%, and provides nitrite nitrogen and ammonia nitrogen for the anaerobic ammonia oxidation reaction; the anaerobic ammonia oxidation reactor converts the nitrite nitrogen and the residual ammonia nitrogen generated by the semi-short-cut nitrification into nitrogen, and returns the anaerobic ammonia oxidation effluent containing nitrate nitrogen to the anaerobic membrane bioreactor. The application is used for treating nitrogen-containing organic wastewater, can realize energy recovery in a front stage, autotrophic denitrification in a rear stage, and deep denitrification and decarburization, and achieves the purpose of synergizing pollutant reduction and energy saving and decarburization.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of wastewater biological treatment, and particularly relates to an anaerobic membrane bioreactor (AnMBR) coupled with an anaerobic ammonia oxidation (Anammox) wastewater biological denitrification energy production system. BACKGROUND

[0002] The anaerobic membrane bioreactor overcomes many problems in traditional anaerobic digestion technology, improves the treatment effect, enhances the energy recovery efficiency, and has the effect of sludge concentration, but the removal efficiency of nitrogen pollutants is low, and there is a problem of residual ammonia nitrogen. The residual ammonia nitrogen not only causes the nitrogen pollutants in the anaerobic membrane bioreactor to be unable to be effectively removed, but also causes ammonia inhibition in the anaerobic membrane bioreactor. Because the ammonia nitrogen concentration is too high, the microorganisms are poisoned, the gas production performance of the whole digestion system is reduced, and the organic matter is not completely converted. Therefore, the removal of ammonia nitrogen and residual organic matter in the anaerobic membrane bioreactor is of great significance for expanding the application of the anaerobic membrane bioreactor.

[0003] The anaerobic ammonia oxidation process is currently the simplest and most economical biological denitrification route, but part of the nitrate is still accumulated in the final product, which causes the nitrogen pollutants to be unable to be deeply removed. If the traditional denitrification process is used for removal, a large amount of carbon source is consumed, and energy consumption is caused. Therefore, under the premise of not wasting the carbon source, deep removal of the nitrate in the effluent of the anaerobic ammonia oxidation process is expected to provide a new way for solving the problem of nitrate accumulation of the process. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of the present application is to provide an anaerobic membrane bioreactor coupled with an anaerobic ammonia oxidation wastewater biological denitrification energy production system, so as to solve the problems of residual ammonia nitrogen and residual organic matter in the anaerobic membrane bioreactor and accumulation of a certain amount of nitrate after the anaerobic ammonia oxidation process.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] An anaerobic membrane bioreactor coupled with an anaerobic ammonia oxidation wastewater biological denitrification energy production system, comprising:

[0007] The anaerobic membrane bioreactor uses nitrogen-containing organic wastewater as raw material, produces methane through anaerobic digestion reaction, provides ammonia nitrogen for the subsequent denitrification process through ammoniation reaction, realizes deep denitrification and carbon removal through denitrification reaction, and retains particulate organic matter in wastewater through the membrane assembly;

[0008] The semi-short-cut nitrification reactor is connected with the effluent port of the anaerobic membrane bioreactor, controls the ammonia oxidation degree to be 50-57%, and provides nitrite nitrogen and ammonia nitrogen for the anaerobic ammonia oxidation reaction;

[0009] The anaerobic ammonia oxidation reactor is connected with the effluent outlet of the semi-short-cut nitrification reactor, and converts the nitrous nitrogen and ammonia nitrogen generated by the semi-short-cut nitrification reactor into nitrogen, and part of the effluent of the anaerobic ammonia oxidation reactor containing nitric nitrogen is refluxed to the anaerobic membrane bioreactor.

[0010] In an embodiment, the anaerobic digestion reaction, the ammoniation reaction and the denitrification reaction are performed in the anaerobic membrane bioreactor; the anaerobic digestion reaction and the ammoniation reaction are started simultaneously and terminated simultaneously; the denitrification reaction is started when the effluent of the anaerobic ammonia oxidation reactor containing nitric nitrogen is refluxed to the anaerobic membrane bioreactor, and the denitrification reaction is terminated when the nitric nitrogen or the carbon source is completely consumed.

[0011] In an embodiment, the nitrogen-containing organic wastewater contains carbohydrates, proteins, oils and ammonia nitrogen; and the influent of the anaerobic membrane bioreactor is preferentially intermittent influent when the influent concentration is large or the sludge load is small, and is preferentially continuous influent when the influent concentration is small or the sludge load is large.

[0012] In an embodiment, the membrane assembly is a hollow fiber membrane assembly or a microfiltration flat plate membrane assembly, and the membrane assembly is arranged in the reactor.

[0013] In an embodiment, an aeration device is arranged in the semi-short-cut nitrification reactor, and continuous aeration or intermittent aeration is performed from bottom to top or from top to bottom.

[0014] In an embodiment, the effluent containing nitric nitrogen in the anaerobic ammonia oxidation reactor is refluxed to the anaerobic membrane bioreactor at different proportions, and the proportion of nitric nitrogen in the anaerobic membrane bioreactor is gradually increased by increasing the reflux proportion.

[0015] The reflux proportion can be 20%, 30%, 50%, 60% or 80%, and the reason for increasing the reflux proportion is to gradually increase the proportion of nitric nitrogen in the reactor, so as to prevent the system from collapsing due to too high nitric nitrogen entering at one time. Finally, the nitric nitrogen is completely removed.

[0016] In an embodiment, the semi-short-cut nitrification reactor is a gas stripping type internal circulation reactor, and the anaerobic ammonia oxidation reactor is an expanded granular sludge bed reactor.

[0017] The application also provides a use method of the anaerobic membrane bioreactor coupled with the anaerobic ammonia oxidation wastewater biological denitrification energy production system, which comprises the following steps:

[0018] Step 1: anaerobic digestion of the nitrogen-containing organic wastewater by the anaerobic membrane bioreactor, so that most of the organic matters are efficiently converted into methane, and the effluent contains high-concentration ammonia nitrogen;

[0019] Step 2, using a semi-short-cut nitrification reactor to semi-short-cut nitrify the effluent of the anaerobic membrane bioreactor, controlling the ammonia oxidation degree to be 50-57%, and containing ammonia nitrogen and nitrite nitrogen in the effluent;

[0020] Step 3, using an anaerobic ammonia oxidation reactor to anaerobic ammonia oxidize the effluent of the semi-short-cut nitrification reactor, converting most of the nitrogen into nitrogen gas, and accumulating part of the nitrate in the effluent;

[0021] Step 4, returning part of the effluent of the anaerobic ammonia oxidation reactor to the anaerobic membrane bioreactor, triggering the denitrification reaction by using the residual organic matter after anaerobic digestion in the anaerobic membrane bioreactor, and realizing deep denitrification and decarburization.

[0022] In one embodiment, the effluent of the anaerobic membrane bioreactor is diluted at different ratios to achieve different ammonia nitrogen concentrations, the load of the semi-short-cut nitrification reactor is gradually increased to prevent the system from collapsing due to too high ammonia nitrogen concentration, and the diluted effluent is pumped into the semi-short-cut nitrification reactor to realize the start-up and stable operation of the semi-short-cut nitrification reactor.

[0023] In one embodiment, the ammonia oxidation degree in the semi-short-cut nitrification reactor is controlled to be 50-57%.

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] 1. Since the anaerobic digestion reaction, ammoniation reaction and denitrification reaction occur in the anaerobic membrane bioreactor, the semi-short-cut nitrification reactor provides nitrite nitrogen and ammonia nitrogen for the anaerobic ammonia oxidation reaction, and the anaerobic ammonia oxidation reactor converts the nitrite nitrogen and ammonia nitrogen produced by the semi-short-cut nitrification reaction into nitrogen gas while providing nitrate for the denitrification reaction, therefore the system can realize energy recovery in the front section and autotrophic denitrification in the rear section. Among them, the "front section" refers to the anaerobic digestion section, and the "rear section" refers to the short-cut nitrification and anaerobic ammonia oxidation section.

[0026] 2. Under the premise of short process and low energy consumption, the system can realize deep denitrification and decarburization by returning the anaerobic ammonia oxidation effluent containing nitrate to the anaerobic membrane bioreactor, achieving the purpose of pollution reduction and energy saving and carbon reduction. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the principle of the system of the present application. DETAILED DESCRIPTION

[0028] The embodiment of the system of the present application will be described in detail below in combination with the drawings and examples.

[0029] Based on the prior art, the present application hopes to solve the problems of ammonia nitrogen, residual organic matter after anaerobic digestion and partial nitrate accumulation after anaerobic ammonia oxidation by refluxing the effluent of anaerobic ammonia oxidation to the anaerobic membrane bioreactor without consuming external energy, so as to realize deep denitrification and decarburization.

[0030] As shown in Figure 1 The present application is an anaerobic membrane bioreactor coupled with anaerobic ammonia oxidation high-efficiency wastewater biological denitrification energy system, which comprises an anaerobic membrane bioreactor 1, a semi-short-cut nitrification reactor 2 and an anaerobic ammonia oxidation reactor 3. Through the combination of the three reactors, efficient energy conversion of organic matter and deep removal of nitrogen pollutants are realized.

[0031] The anaerobic membrane bioreactor 1 uses nitrogen-containing organic wastewater as raw material, mainly for anaerobic digestion reaction, accompanied by ammoniation reaction, and denitrification reaction caused by reflux of nitrate-containing anaerobic ammonia oxidation effluent. It produces methane through anaerobic digestion reaction, provides ammonia nitrogen for the latter denitrification process through ammoniation reaction, and realizes deep denitrification and decarburization through denitrification reaction. For example, the temperature in the anaerobic membrane bioreactor 1 is maintained at about 35℃, and the pH is maintained between 6.8 and 7.2. The nitrogen-containing organic wastewater of the present application mainly includes carbohydrates, proteins, fats and ammonia nitrogen.

[0032] Specifically, in the anaerobic membrane bioreactor 1, if there is anaerobic digestion sludge, after adding wastewater (typically such as catering wastewater), when the system is in an anaerobic state, the anaerobic digestion reaction starts, and when the catering wastewater in the system is consumed, the anaerobic digestion reaction stops. During the anaerobic digestion reaction, organic nitrogen such as protein in the wastewater will be converted into ammonia nitrogen through ammoniation reaction under the action of microorganisms. The anaerobic digestion reaction is accompanied by ammoniation reaction, so the ammoniation reaction and the anaerobic digestion reaction start and stop at the same time. When the nitrate-containing anaerobic ammonia oxidation effluent is refluxed to the anaerobic membrane bioreactor 1, the denitrification reaction starts. The denitrifying bacteria use the residual carbon source in the anaerobic membrane bioreactor 1 and the nitrate in the anaerobic ammonia oxidation effluent to carry out denitrification reaction. When the nitrate or carbon source is completely consumed, the denitrification reaction stops.

[0033] The anaerobic membrane bioreactor 1 includes a membrane assembly for intercepting particulate organic matter in the wastewater, and the membrane assembly is placed inside the anaerobic membrane bioreactor 1. The wastewater enters the anaerobic membrane bioreactor 1 to undergo anaerobic digestion reaction, and the membrane assembly intercepts the particulate organic matter in the wastewater. For example, the membrane assembly can use hollow fiber membrane assembly or microfiltration flat sheet membrane assembly. When the membrane assembly is blocked or contaminated, its filtration performance can be restored by backwashing.

[0034] According to the water quality and the characteristics of the sludge, the influent of the anaerobic membrane bioreactor 1 can be pumped in continuously or intermittently. For example, when the influent concentration is large or the sludge can withstand a small load, intermittent influent is preferred; when the influent concentration is small or the sludge can withstand a large load, continuous influent is selected. Here, small and large are selected according to the actual operation situation to determine the threshold.

[0035] The effluent of the anaerobic membrane bioreactor 1 is diluted and mixed at different ratios to achieve different ammonia nitrogen concentrations, so as to start and stably operate the semi-short-cut nitrification reactor 2. For example, the effluent of the anaerobic membrane bioreactor 1 can be diluted and mixed at a ratio of 20%, 30%, 50%, 60%, or 80%.

[0036] Since the effluent of the anaerobic membrane bioreactor 1 enters the semi-short-cut nitrification reactor 2, and the effluent of the anaerobic membrane bioreactor 1 contains ammonia nitrogen, the ammonia nitrogen concentration in the effluent is distributed from low to high through dilution and mixing; the effect is that the effluent of the anaerobic membrane bioreactor 1 containing ammonia nitrogen entering the semi-short-cut nitrification reactor 2 has a concentration from low to high, so as to gradually increase the load of the semi-short-cut nitrification reactor 2 and prevent the system from collapsing due to excessive load of the reactor.

[0037] The semi-short-cut nitrification reactor 2 is connected to the effluent outlet of the anaerobic membrane bioreactor 1, performs semi-short-cut nitrification reaction, controls the ammonia oxidation degree to be 50-57%, and provides nitrite nitrogen and ammonia nitrogen for the anaerobic ammonia oxidation reaction. For example, the semi-short-cut nitrification reactor 2 can adopt a gas-lift internal circulation reactor, which performs continuous aeration or intermittent aeration from bottom to top or from top to bottom through the aeration device inside the reactor, maximally mixes the sludge, and avoids forming dead zones.

[0038] The anaerobic ammonia oxidation reactor 3 is connected to the effluent outlet of the semi-short-cut nitrification reactor 2, converts the nitrite nitrogen and residual ammonia nitrogen produced by the semi-short-cut nitrification system into nitrogen gas, and returns part of the anaerobic ammonia oxidation effluent containing nitrite nitrogen to the anaerobic membrane bioreactor 1 through the backflow setting. For example, the anaerobic ammonia oxidation reactor 3 can adopt an expanded granular sludge bed reactor, and the anaerobic ammonia oxidation effluent containing nitrite nitrogen can be returned to the front-stage anaerobic membrane bioreactor 1 at different ratios of 20%, 30%, 50%, 60%, and 80%. By increasing the return ratio, the proportion of nitrite nitrogen in the anaerobic membrane bioreactor 1 is gradually increased, so as to prevent the system from collapsing due to excessive nitrite nitrogen entering at one time. Finally, complete removal of nitrite nitrogen is achieved. Thus, without additional addition of organic carbon source, the residual organic matter in the anaerobic membrane bioreactor 1 triggers denitrification reaction, and deep nitrogen and carbon removal is achieved.

[0039] Under the anaerobic condition of the anaerobic ammonia oxidation reactor 3, the anaerobic ammonia oxidation bacteria oxidize ammonia into nitrogen gas and accumulate part of nitrate nitrogen by taking ammonia as an electron donor and taking nitrite as an electron acceptor.

[0040] The system is used for treating nitrogen-containing organic wastewater, can realize energy recovery in the front section, autotrophic denitrification in the rear section, and can realize deep denitrification and decarburization by returning the anaerobic ammonia oxidation effluent containing nitrate nitrogen to the anaerobic membrane bioreactor to trigger denitrification reaction, so as to achieve the dual purposes of pollutant reduction and energy saving and decarburization.

[0041] The use method of the anaerobic membrane bioreactor coupled with the wastewater biological denitrification energy production system of anaerobic ammonia oxidation, comprising the following steps:

[0042] Step 1: anaerobic digestion of nitrogen-containing organic wastewater by the anaerobic membrane bioreactor 1, most of the organic matter is efficiently converted into methane, and the effluent contains high-concentration ammonia nitrogen.

[0043] Step 2: semi-short-cut nitrification of the effluent of the anaerobic membrane bioreactor 1 by the semi-short-cut nitrification reactor 2, the ammonia oxidation degree in the semi-short-cut nitrification reactor 2 is controlled to be 50-57%, and the effluent contains ammonia nitrogen and nitrite.

[0044] In this step, the effluent of the anaerobic membrane bioreactor 1 can be diluted in different proportions to achieve different ammonia nitrogen concentrations, and the load of the semi-short-cut nitrification reactor 2 is gradually increased to prevent the system of the semi-short-cut nitrification reactor 2 from collapsing due to too high ammonia nitrogen concentration, and the diluted effluent is pumped into the semi-short-cut nitrification reactor 2 to realize the start-up and stable operation of the semi-short-cut nitrification reactor 2.

[0045] Since the semi-short-cut nitrification reaction is carried out in the semi-short-cut nitrification reactor 2, the semi-short-cut nitrification reaction is the conversion of ammonia nitrogen into nitrite, and by controlling the ammonia oxidation degree to be 50-57%, the occurrence degree of the semi-short-cut nitrification reaction is controlled, so that 50-57% of the ammonia nitrogen in the influent is converted into nitrite, and nearly half of the ammonia nitrogen remains, at this time, the molar ratio of ammonia nitrogen to nitrite in the semi-short-cut nitrification reactor 2 is about 1:1. Since the molar ratio of ammonia nitrogen to nitrite required by the anaerobic ammonia oxidation reaction is 1:1.32, controlling the ammonia oxidation degree to be 50-57% can better achieve the required ratio of ammonia nitrogen to nitrite for the anaerobic ammonia oxidation reaction.

[0046] Step 3: anaerobic ammonia oxidation of the effluent of the semi-short-cut nitrification reactor 2 by the anaerobic ammonia oxidation reactor 3, most of the ammonia nitrogen and nitrite are simultaneously converted into nitrogen gas, and part of nitrate nitrogen is inevitably accumulated in the effluent.

[0047] Step 4, part of the effluent of the anaerobic ammonia oxidation reactor 3 is backflowed to the anaerobic membrane bioreactor 1, and the residual organic matter after anaerobic digestion in the anaerobic membrane bioreactor 1 is used to trigger the denitrification reaction, so as to achieve deep denitrification and decarburization.

[0048] The principle of the present application is explained as follows:

[0049] The present application uses an anaerobic membrane bioreactor to couple an anaerobic ammonia oxidation system to treat nitrogen-containing organic wastewater. The nitrogen-containing organic wastewater mainly includes carbohydrates, proteins, oils and fats, and ammonia nitrogen. After the anaerobic digestion reaction in the anaerobic membrane bioreactor system, including the hydrolysis, acidification, acetogenesis and methanogenesis stages, the macromolecular organic matter is converted into small molecular organic matter through the hydrolysis stage, and then converted into volatile fatty acids through the acidification stage, and then converted into substances such as acetic acid through the acetogenesis stage, and finally converted into substances such as methane through the methanogenesis stage. The ammoniation reaction gradually decomposes the proteins into ammonia nitrogen for use in the subsequent denitrification process. The denitrification reaction uses organic matter as the electron donor and nitrate nitrogen as the electron acceptor to convert the nitrate nitrogen into nitrogen gas. The membrane module built in the anaerobic membrane bioreactor effectively retains the particulate organic matter in the wastewater.

[0050] The semi-short-cut nitrification reactor 2 uses ammonia as the electron donor and oxygen as the electron acceptor to convert the ammonia nitrogen into nitrite nitrogen, and controls the degree of ammonia oxidation to be 50-57%, so as to provide nitrite nitrogen and ammonia nitrogen for the anaerobic ammonia oxidation reaction. The electron donor (such as ammonia nitrogen) is provided by the effluent of the anaerobic membrane bioreactor 1, and the electron acceptor is provided by the aeration device and is sourced from oxygen or air. The effluent of the semi-short-cut nitrification reactor 2 mainly includes ammonia nitrogen and nitrite nitrogen.

[0051] The anaerobic ammonia oxidation reactor 3 uses ammonia as the electron donor and nitrite nitrogen as the electron acceptor to convert the nitrite nitrogen and the remaining ammonia nitrogen produced by the semi-short-cut nitrification system into nitrogen gas. The electron donor and the electron acceptor are both provided by the effluent of the semi-short-cut nitrification reactor 2. The effluent of the anaerobic ammonia oxidation reactor 3 mainly includes nitrate nitrogen.

[0052] In addition, the anaerobic ammonia oxidation process produces nitrate nitrogen, so the anaerobic ammonia oxidation effluent containing nitrate nitrogen is backflowed to the anaerobic membrane bioreactor system, and the residual organic matter after anaerobic digestion in the anaerobic membrane bioreactor is used to trigger the denitrification reaction, so as to achieve deep denitrification and decarburization. Through the above process, efficient conversion of organic energy and deep removal of nitrogen pollutants in wastewater can be achieved.

Claims

1. An anaerobic membrane bioreactor coupled with an anaerobic ammonia oxidation wastewater biological denitrification energy production system, characterized in that, Comprise: Anaerobic membrane bioreactor (1) to produce methane by anaerobic digestion reaction, to provide ammonia nitrogen for the denitrification process by ammonification reaction, to achieve deep denitrification and decarburization by denitrification reaction, and to intercept particulate organic matter in wastewater by membrane module; Semi-short-cut nitrification reactor (2) connected with the effluent of anaerobic membrane bioreactor (1) to take ammonia as electron donor and oxygen as electron acceptor, wherein the electron donor is provided by the effluent of anaerobic membrane bioreactor (1), and the ammonia oxidation degree is controlled at 50-57% to provide nitrite nitrogen and ammonia nitrogen for anaerobic ammonia oxidation reaction; Anaerobic ammonia oxidation reactor (3) connected with the effluent of semi-short-cut nitrification reactor (2) to take ammonia as electron donor and nitrite nitrogen as electron acceptor to convert nitrite nitrogen and ammonia nitrogen produced by semi-short-cut nitrification reactor (2) into nitrogen, wherein the electron donor and electron acceptor are provided by the effluent of semi-short-cut nitrification reactor (2), and part of the effluent containing nitrate nitrogen is returned to anaerobic membrane bioreactor (1) to trigger denitrification reaction by using residual organic matter after anaerobic digestion in anaerobic membrane bioreactor to achieve deep denitrification and decarburization.

2. The system according to claim 1, wherein the system is characterized by, The anaerobic digestion reaction, ammonification reaction and denitrification reaction are carried out in anaerobic membrane bioreactor (1); the anaerobic digestion reaction and ammonification reaction start and terminate simultaneously; the denitrification reaction starts when the effluent containing nitrate nitrogen is returned to anaerobic membrane bioreactor (1), and the denitrification reaction terminates when nitrate nitrogen or carbon source is completely consumed.

3. The system according to claim 1, wherein the system is characterized by, The nitrogen-containing organic wastewater comprises carbohydrates, proteins, fats and ammonia nitrogen; the influent of anaerobic membrane bioreactor is preferentially intermittent influent when the influent concentration is large or the sludge can withstand small load, and is preferentially continuous influent when the influent concentration is small or the sludge can withstand large load.

4. The system according to claim 1, wherein the system is characterized by, The membrane module adopts hollow fiber membrane module or microfiltration flat plate membrane module, and the membrane module is placed inside the reactor.

5. The system according to claim 1, wherein the system is characterized by, The semi-short-cut nitrification reactor (2) is provided with aeration device inside, and continuous aeration or intermittent aeration is carried out from bottom to top or from top to bottom.

6. The system according to claim 1, wherein the system is characterized by, The effluent containing nitrate nitrogen in anaerobic ammonia oxidation reactor (3) is returned to anaerobic membrane bioreactor (1) at different proportions to gradually increase the proportion of nitrate nitrogen in anaerobic membrane bioreactor (1) by increasing the return proportion.

7. The system according to claim 1, wherein the system is characterized by, The semi-short-cut nitrification reactor (2) adopts gas stripping type internal circulation reactor, and the anaerobic ammonia oxidation reactor (3) adopts expanded granular sludge bed reactor.

8. The use of anaerobic membrane bioreactor coupled ANAMMOX wastewater biological denitrification energy production system according to claim 1, characterized in that, Comprise the following steps: Step 1, anaerobic digestion of the nitrogen-containing organic wastewater by anaerobic membrane bioreactor (1) to efficiently convert most of the organic matter into methane, and the effluent contains high concentration of ammonia nitrogen; Step 2, semi-short-cut nitrification of the effluent of anaerobic membrane bioreactor (1) by semi-short-cut nitrification reactor (2) to control the ammonia oxidation degree at 50-57%, and the effluent contains ammonia nitrogen and nitrite nitrogen; Step 3, anaerobic ammonia oxidation of the effluent of semi-short-cut nitrification reactor (2) by anaerobic ammonia oxidation reactor (3) to convert most of the nitrogen into nitrogen, and at the same time, part of the nitrate nitrogen is accumulated in the effluent. Step 4, part of the effluent of the ANAMMOX reactor (3) is backflowed to the anaerobic membrane bioreactor (1) to trigger the denitrification reaction by the residual organic matter after anaerobic digestion in the anaerobic membrane bioreactor (1), so as to realize deep denitrification and decarburization.

9. The method of use of claim 8, wherein, The effluent of the anaerobic membrane bioreactor (1) is diluted at different ratios to achieve different ammonia nitrogen concentrations, the load of the semi-short-cut nitrification reactor (2) is gradually increased, and the system collapse caused by excessively high ammonia nitrogen concentration is prevented, and the diluted effluent is pumped into the semi-short-cut nitrification reactor (2) to realize the start-up and stable operation of the semi-short-cut nitrification reactor (2).

10. The method of use of claim 8, wherein, The degree of ammonia oxidation in the semi-short-cut nitrification reactor (2) is controlled to be 50-57%.

Images