An integrated biological denitrification reactor and treatment system for high ammonia nitrogen wastewater

Abstract

This invention discloses an integrated biological denitrification reactor for high ammonia nitrogen wastewater, comprising: a shell; inside the shell, arranged sequentially from top to bottom, an effluent weir, anaerobic ammonia oxidation packing material and bacterial strains, a microporous aerator, and a water distributor; the anaerobic ammonia oxidation packing material and bacterial strains are located directly above the microporous aerator, and a vertical reflux channel is formed between the anaerobic ammonia oxidation packing material and bacterial strains and the outer or inner side of the microporous aerator; the effluent weir is located directly above the reflux channel; the water distributor is connected to one end of the inlet pipe and one end of the reflux pipe, the other end of the inlet pipe receiving the high ammonia nitrogen wastewater to be treated, and the other end of the reflux pipe connecting to the bottom of the reflux channel. The biological denitrification reactor of this invention achieves the removal of ammonia nitrogen and total nitrogen through microporous aeration for oxygen supply, circulation reflux through air lift, and nitrification and anaerobic ammonia oxidation through bottom water distribution and upper biological packing material.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an integrated biological denitrification reactor and treatment system for high ammonia nitrogen wastewater. Background Technology

[0002] Ammonia nitrogen has long been one of the major pollutants in my country's surface water, and its primary source is industrial wastewater. Therefore, efficient ammonia nitrogen removal technologies from industrial wastewater are a key research focus both domestically and internationally. According to the United Nations Environment Programme, wastewater treatment accounts for approximately 2% of global carbon emissions, making it a significant area for emission reduction.

[0003] Industrial wastewater has high carbon and nitrogen concentrations, large production and discharge volumes, and accounts for more than 51% of greenhouse gas emissions in the industry. In addition, the energy utilization rate of industrial wastewater is less than 20%, and the cost of denitrification is high. Therefore, there is an urgent need to develop green and low-carbon industrial wastewater treatment technologies to promote industrial upgrading.

[0004] Wastewater treatment plants are crucial for removing nitrogen, phosphorus, and organic pollutants. However, in practice, they carry the risk of "energy consumption at the expense of pollution transfer." With the focus of upgrades shifting to deep denitrification, wastewater treatment not only consumes significant amounts of electricity, heat, and chemical reagents, increasing indirect carbon emissions, but also directly emits large quantities of greenhouse gases (CO2, CH4, N2O, etc.) during operation. Therefore, integrating low-carbon principles into the entire wastewater treatment process and developing and applying biological denitrification processes with carbon reduction capabilities is imperative. Anaerobic ammonium oxidation (Anammox) possesses zero-carbon, autotrophic denitrification properties, making it the preferred technology for achieving carbon emission reduction.

[0005] Currently, most industrial enterprises have already implemented traditional biochemical nitrogen removal technologies. However, due to factors such as capacity expansion and increasing nitrogen concentration, the existing land area and building layout are cramped, which greatly limits the application of anaerobic ammonia oxidation technology. Therefore, adopting an integrated biological nitrogen removal reactor with a high aspect ratio and small footprint will significantly reduce the land area required and solve the practical application problem. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an integrated biological denitrification reactor and treatment system for high ammonia nitrogen wastewater.

[0007] This invention discloses an integrated biological denitrification reactor for high ammonia nitrogen wastewater, comprising: a shell;

[0008] The shell contains, from top to bottom, an effluent weir, anaerobic ammonia oxidation packing material and bacteria, a microporous aerator, and a water distributor. The anaerobic ammonia oxidation packing material and bacteria are located directly above the microporous aerator. The anaerobic ammonia oxidation packing material and bacteria form a vertical reflux channel with the outer or inner side of the microporous aerator. The effluent weir is located directly above the reflux channel. The water distributor is connected to one end of the inlet pipe and one end of the reflux pipe. The other end of the inlet pipe receives the high ammonia nitrogen wastewater to be treated, and the other end of the reflux pipe is connected to the bottom of the reflux channel.

[0009] As a further improvement of the present invention, the high ammonia nitrogen wastewater and the nitrified mixture flowing back in the return channel enter the water distributor at the bottom of the shell, and after being mixed by the water distributor, they form an upward flow.

[0010] During the rising process of the bottom mixed liquor, it reacts with the bottom anaerobic ammonia oxidation granular sludge. After the effluent is aerated and lifted by the microporous aerator, the ammonia nitrogen is oxidized into nitrite by ammonia oxidation bacteria under the action of oxygen. During the rising process, it comes into contact with the anaerobic ammonia oxidation packing and bacteria, converting ammonia nitrogen and nitrate into nitrogen gas for emission.

[0011] After rising to the top, the upflow forms a downward nitrification mixture through the return channel. Part of the nitrification mixture is distributed to the bottom through the return pipe for anaerobic ammonia oxidation reaction, while the other part of the nitrification mixture re-enters the bottom of the microporous aerator for the lifting reaction.

[0012] As a further improvement of the present invention, a sleeve is provided in the middle of the shell, and the anaerobic ammonia oxidation packing material and bacteria and the microporous aerator are arranged vertically and horizontally in the sleeve, and a reflux channel is formed between the sleeve and the shell; or, the cavity of the sleeve serves as a reflux channel, and the anaerobic ammonia oxidation packing material and bacteria and the microporous aerator are arranged vertically and horizontally in the cavity between the sleeve and the shell.

[0013] As a further improvement of the present invention, a baffle plate is provided below the sleeve. When the anaerobic ammonia oxidation packing and bacteria are placed inside the sleeve, the baffle plate is fixed on the inner wall of the shell and is used to lift the rising flow of the water distributor upward along the middle through the microporous aerator. When the anaerobic ammonia oxidation packing and bacteria are placed outside the sleeve, the baffle plate is fixed at the bottom of the sleeve and is used to lift the rising flow of the water distributor upward along the outer side through the microporous aerator.

[0014] As a further improvement of the present invention, a three-phase separator is provided at the bottom of the outlet weir, and an exhaust pipe is connected to the three-phase separator and the gas collection point at the bottom of the shell, and an exhaust valve is provided on the exhaust pipe.

[0015] As a further improvement of the present invention, the hydraulic load of the three-phase separator is ≤2m / h, and it is modularly embedded in the reactor.

[0016] As a further improvement of the present invention, an inlet pump is installed on the inlet pipe, and a mixed liquor return pump or an air-lift return system is installed on the return pipe. The inlet point of the mixed liquor return pump is the aeration air-lift water return section, rather than the mixed liquor aeration section or the bottom mixed liquor aeration area.

[0017] As a further improvement of the present invention, the height of the upper and middle microporous aerator is 1-9m above the effluent surface of the sedimentation tank, preferably 5-8m. The function of the microporous aerator is firstly to ensure a stable nitrification reaction through air supply, and secondly to form an air-lift mixing reaction through aeration, thereby achieving a large reflux and providing ammonia nitrogen and nitrite nitrogen for anaerobic ammonia oxidation in the packing material. On the other hand, part of the air-lifted refluxed mixed liquid is pumped back to the bottom to mix with the influent, increasing the upward flow velocity of the bottom water distribution, and realizing the bottom granular anaerobic ammonia oxidation reaction and the selection of granular anaerobic ammonia oxidation sludge.

[0018] As a further improvement of the present invention, the upward flow velocity of the bottom mixed liquid formed by the water distributor is 0.5-1.5 m / h, which reacts ammonia nitrogen and nitrite with anaerobic ammonia oxidation granular sludge to achieve rapid denitrification.

[0019] As a further improvement of the present invention, the integrated biological denitrification reactor adopts a high aspect ratio modular reactor, preferably with an aspect ratio of 1:1 to 8:1. By setting up the high aspect ratio reactor, an aerated nitrification-anaerobic ammonium oxidation reaction zone is formed in the upper and middle parts, which is mainly composed of biological packing. The bottom part is a mixed reaction zone for anaerobic ammonium oxidation, which is rich in ammonia nitrogen, nitrification mixed liquor and anaerobic ammonium oxidation granular sludge. Through uniform water distribution, the bottom area is an upflow mixed anaerobic ammonium oxidation reaction zone. The nitrification reaction is formed by aeration in the middle section of the reactor, which converts some ammonia nitrogen into nitrite nitrogen. The nitrite and ammonia nitrogen enter the upper frame packing of the microporous aerator, where anaerobic ammonium oxidizing bacteria convert the ammonia nitrogen and nitrite in the mixed liquor into nitrogen gas for removal.

[0020] As a further improvement of the present invention, an online dissolved oxygen meter is installed at the top of the reactor. The large reflux port mixing is achieved through the air lift effect of aeration, which makes it easier to control DO and achieve stable nitrification. The dissolved oxygen concentration in the middle and upper reaction zone is controlled at 0-1.0 mg / L, preferably <0.5 mg / L.

[0021] As a further improvement of the present invention, the packing material is a three-dimensional fixed biofilm packing material, and the size of the packing material must be smaller than the aeration port of the reaction zone in order to facilitate the transplantation and maintenance of microbial strains.

[0022] As a further improvement of the present invention, the integrated biological denitrification reactor can be applied to the treatment of wastewater with ammonia nitrogen concentration >200mg / L in multiple fields such as fermentation, pharmaceuticals, coal chemical industry, landfill leachate, and kitchen waste biogas slurry.

[0023] As a further improvement of the present invention

[0024] From the dissolved oxygen gradient: microporous aerator > anaerobic ammonia oxidation packing and bacteria > return pipe > water distributor > effluent weir;

[0025] From the nitrite concentration gradient: anaerobic ammonia oxidation packing and bacteria > reflux pipe > water distributor > effluent weir;

[0026] The ammonia nitrogen concentration gradient is as follows: inlet pipe > water distributor > anaerobic ammonia oxidation packing and bacteria > return pipe > outlet weir.

[0027] The present invention also discloses a high ammonia nitrogen wastewater treatment system, comprising: a pretreatment system, an ultraviolet sterilization system, the above-mentioned integrated biological denitrification reactor, and a deep treatment system arranged sequentially along the wastewater treatment direction;

[0028] Specific processing methods include:

[0029] Step 1: High ammonia nitrogen wastewater first enters the pretreatment system to remove high concentrations of COD, recalcitrant toxic and harmful pollutants, SS and other pollutants;

[0030] Step 2: The pretreated high ammonia nitrogen wastewater enters the ultraviolet sterilization system. The ultraviolet lamp sterilization further removes the activity of microorganisms in the effluent SS, avoiding the adverse effects of SS proliferation on the ammonia oxidation and anaerobic ammonia oxidation systems in the subsequent integrated biological denitrification reactor.

[0031] Step 3: After passing through the ultraviolet sterilization system, the high ammonia nitrogen wastewater enters the integrated biological denitrification reactor. It achieves the removal of ammonia nitrogen and total nitrogen through microporous aeration to supply oxygen, circulation and reflux through air lifting, and nitrification and anaerobic ammonia oxidation through bottom water distribution and upper biological packing.

[0032] Step 4: The effluent from the integrated biological denitrification reactor enters the subsequent advanced treatment system to further remove residual COD, NH3-N, and TN to achieve compliant discharge.

[0033] As a further improvement of the present invention, the pretreatment system can use various measures such as anaerobic digestion, advanced catalytic oxidation, and mixed sedimentation to remove pollutants such as COD, NH3-N, TN, TP, and SS according to the water quality characteristics.

[0034] As a further improvement of the present invention, the ultraviolet lamp assembly of the ultraviolet sterilization system uses an ultraviolet lamp tube with a wavelength of 254nm.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] The biological denitrification reactor of this invention achieves the removal of ammonia nitrogen and total nitrogen through microporous aeration for oxygen supply, air lift for circulation and reflux, bottom water distribution and upper biological packing to achieve nitrification and anaerobic ammonia oxidation. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a structure of an integrated biological denitrification reactor for high ammonia nitrogen wastewater disclosed in this invention;

[0038] Figure 2 This is another schematic diagram of the integrated biological denitrification reactor for high ammonia nitrogen wastewater disclosed in this invention.

[0039] In the picture:

[0040] 1. Inlet pump; 2. Mixed liquor return pump; 3. Water distributor; 4. Microporous aerator; 5. Anaerobic ammonia oxidation packing and bacteria; 6. Three-phase separator; 7. Exhaust valve; 8. Outlet weir; 9. Shell; 10. Sleeve; 11. Ultraviolet sterilization system. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The present invention will now be described in further detail with reference to the accompanying drawings:

[0043] like Figure 1 , 2 As shown, the present invention provides an integrated biological denitrification reactor for high ammonia nitrogen wastewater, comprising: a shell 9; wherein,

[0044] The shell 9 of the present invention has a height-to-diameter ratio, preferably 1:1 to 8:1; the shell 9 is provided with an outlet weir 8, anaerobic ammonia oxidation packing and bacteria 5, microporous aerator 4 and water distributor 3 from top to bottom.

[0045] In this invention, the anaerobic ammonia oxidation packing material and bacterial strain 5 are located directly above the microporous aerator 4 and spaced at a predetermined distance. A vertical reflux channel is formed between the anaerobic ammonia oxidation packing material and bacterial strain 5 and the outer or inner side of the microporous aerator 4, and the effluent weir 8 is located directly above the reflux channel; for example, as... Figure 1As shown, a sleeve 10 is provided in the middle of the shell 9. The anaerobic ammonia oxidation packing material and the bacterial strain 5 are arranged vertically and vertically within the sleeve 10 with the microporous aerator 4. A return channel is formed between the sleeve 10 and the shell 9. A baffle plate is provided below the sleeve 10 and is fixed to the inner wall of the shell. It is used to lift the rising flow from the water distributor upward along the middle through the microporous aerator; or, as... Figure 2 As shown, a sleeve 10 is provided in the middle of the shell 9. The cavity of the sleeve 10 serves as a return channel. Anaerobic ammonia oxidation packing material, bacteria 5, and microporous aerators 4 are arranged vertically and vertically within the cavity between the sleeve 10 and the shell 9. A baffle plate is fixed to the bottom of the sleeve to lift the rising flow from the water distributor upwards along the outside through the microporous aerator. A three-phase separator 6 is provided at the bottom of the effluent weir 8. An exhaust pipe is connected to the three-phase separator 6 and the air collection point at the bottom of the shell 9. An exhaust valve 7 is provided on the exhaust pipe. The hydraulic load of the three-phase separator 6 is ≤2m / h, and it is modularly embedded in the reactor.

[0046] The water distributor 3 of the present invention is connected to one end of the inlet pipe and the return pipe respectively. The other end of the inlet pipe receives the high ammonia nitrogen wastewater to be treated, and the other end of the return pipe is connected to the bottom of the return channel. The inlet pipe is equipped with an inlet pump 1, and the return pipe is equipped with a mixed liquor return pump or air lift return pump 2. The inlet point of the mixed liquor return pump 2 is the aeration air lift water return section, rather than the mixed liquor aeration section or the bottom mixed liquor aeration area.

[0047] In this invention, high-ammonia nitrogen wastewater is pumped by inlet pump 1 and then connected to the inlet pipe of either the mixed liquor return pump or the air-lift return pump 2. The mixed liquor return pump (or air-lift return pipe) draws nitrite mixed liquor and mixes it with the high-ammonia nitrogen wastewater raw liquid pumped by the inlet pump before entering the bottom water distribution system of the reactor for mixing, forming an upward flow. The upward flow velocity is adjustable and controlled within the range of 0.5-1.5 m / h. During the upward flow of the bottom mixed liquor, it reacts with the bottom anaerobic ammonia oxidation granular sludge. The effluent enters the middle section and is aerated and lifted by a microporous aerator. Under the action of oxygen, ammonia nitrogen is oxidized into nitrite by ammonia-oxidizing bacteria. During the upward flow, it comes into contact with the anaerobic ammonia oxidation packing and bacteria in the middle and upper sections, converting ammonia nitrogen and nitrate into nitrogen gas for emission. As the upward flow passes through the anaerobic ammonia oxidation packing, the packing further traps and enriches the anaerobic ammonia-oxidizing bacteria, greatly improving the system's operational stability and resistance to shock loads. The dissolved oxygen concentration in the upper reaction zone of the microporous aerator is controlled at 0-1.0 mg / L, with the optimal range being 0-0.5 mg / L. After the upward flow reaches the top, it forms a downward-flowing nitrification mixture. A portion of the nitrification mixture is returned to the bottom via the mixture return pump for anaerobic ammonia oxidation, while the other portion re-enters the bottom of the upper microporous aerator for further lifting reaction.

[0048] From the dissolved oxygen gradient: microporous aerator 4 > anaerobic ammonia oxidation packing and bacteria 5 > mixed liquor reflux pump 2 > water distributor 3 > effluent weir 8;

[0049] From the nitrite concentration gradient: anaerobic ammonia oxidation packing and bacteria 5 > mixed liquor reflux pump 2 > water distributor 3 > effluent weir 8;

[0050] From the ammonia nitrogen concentration gradient: inlet pump 1 > water distributor 3 > anaerobic ammonia oxidation packing and bacteria 6 > mixed liquor reflux pump 2 > outlet weir 8.

[0051] Furthermore, the height of the upper and middle microporous aerators is 1-9m above the effluent surface of the sedimentation tank, with a preferred height of 5-8m. The function of the microporous aerators is firstly to ensure a stable air supply for nitrification, and secondly to form an air-lift mixing reaction through aeration, achieving a large reflux and providing ammonia nitrogen and nitrite nitrogen for anaerobic ammonia oxidation in the packing material. On the other hand, part of the air-lifted refluxed mixed liquor is pumped back to the bottom to mix with the influent, increasing the upward flow velocity of the bottom water distribution, enabling the bottom granular anaerobic ammonia oxidation reaction and the selection of granular anaerobic ammonia oxidation sludge.

[0052] Furthermore, the integrated biological denitrification reactor adopts a high aspect ratio modular reactor, preferably with an aspect ratio of 1:1 to 8:1. Through the high aspect ratio reactor configuration, an aerated nitrification-anaerobic ammonium oxidation reaction zone is formed in the upper and middle sections, mainly composed of biological packing materials. The bottom section is a mixed reaction zone for influent distribution and anaerobic ammonium oxidation, containing ammonia nitrogen-rich nitrification mixed liquor and anaerobic ammonium oxidation granular sludge. Through uniform water distribution, the bottom area is an upflow mixed anaerobic ammonium oxidation reaction zone. The nitrification reaction is formed through aeration in the middle section of the reactor, converting some ammonia nitrogen into nitrite nitrogen. The nitrite and ammonia nitrogen enter the upper frame packing material of the microporous aerator, where anaerobic ammonium oxidizing bacteria convert the ammonia nitrogen and nitrite in the mixed liquor into nitrogen gas for removal.

[0053] Furthermore, an online dissolved oxygen meter is installed at the top of the reactor. Through the airlift effect of aeration, the mixing of the large reflux port is achieved, making it easier to control DO and achieve stable nitrification. The dissolved oxygen concentration in the middle and upper reaction zone is controlled at 0-1.0 mg / L, preferably <0.5 mg / L.

[0054] Furthermore, an online pH / T detector needs to be installed in an integrated biological denitrification reactor for high ammonia nitrogen wastewater to control the pH inside the reactor at 7.5-8.5 and the temperature at 28-38℃.

[0055] Furthermore, an integrated biological denitrification reactor for high ammonia nitrogen wastewater can remove TN loads of 1-4.5 kgTN / m³. 3 The concentrations of ammonia nitrogen and nitrite in the effluent can be reduced to below 10 mg / L.

[0056] Furthermore, the packing material is a three-dimensional fixed biofilm packing material, and the size of the packing material must be smaller than the aeration port of the reaction zone in order to facilitate the transplantation and maintenance of microbial strains.

[0057] Furthermore, the integrated biological denitrification reactor can be applied to the treatment of wastewater with ammonia nitrogen concentrations greater than 200 mg / L in multiple fields such as fermentation, pharmaceuticals, coal chemical industry, landfill leachate, and kitchen waste biogas slurry.

[0058] This invention provides a high ammonia nitrogen wastewater treatment system, comprising: a pretreatment system, an ultraviolet sterilization system 11, the aforementioned integrated biological denitrification reactor, and a deep treatment system arranged sequentially along the wastewater treatment direction;

[0059] Specific processing methods include:

[0060] Step 1: High ammonia nitrogen wastewater first enters the pretreatment system to remove high concentrations of COD, recalcitrant toxic and harmful pollutants, SS and other pollutants;

[0061] Step 2: The pretreated high ammonia nitrogen wastewater enters the ultraviolet sterilization system. The ultraviolet lamp sterilization further removes the activity of microorganisms in the effluent SS, avoiding the adverse effects of SS proliferation on the ammonia oxidation and anaerobic ammonia oxidation systems in the subsequent integrated biological denitrification reactor.

[0062] Step 3: After passing through the ultraviolet sterilization system, the high ammonia nitrogen wastewater enters the integrated biological denitrification reactor. It achieves the removal of ammonia nitrogen and total nitrogen through microporous aeration to supply oxygen, circulation and reflux through air lifting, and nitrification and anaerobic ammonia oxidation through bottom water distribution and upper biological packing.

[0063] Step 4: The effluent from the integrated biological denitrification reactor enters the subsequent advanced treatment system to further remove residual COD, NH3-N, and TN to achieve compliant discharge.

[0064] Furthermore, the pretreatment system can employ various methods, such as anaerobic digestion, advanced catalytic oxidation, and mixed sedimentation, to remove pollutants such as COD, NH3-N, TN, TP, and SS, depending on the water quality characteristics.

[0065] As a further improvement of the present invention, the ultraviolet lamp assembly of the ultraviolet sterilization system uses an ultraviolet lamp tube with a wavelength of 254nm.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An integrated biological denitrification reactor for high ammonia nitrogen wastewater, characterized in that, include: case; The shell is provided with an outlet weir, anaerobic ammonia oxidation packing and bacteria, microporous aerator and water distributor in sequence from top to bottom. The anaerobic ammonia oxidation packing and bacteria are located directly above the microporous aerator. The anaerobic ammonia oxidation packing and bacteria form a vertical return channel with the outer or inner side of the microporous aerator. The outlet weir is located directly above the return channel. The water distributor is connected to one end of the inlet pipe and one end of the return pipe, the other end of the inlet pipe receives the high ammonia nitrogen wastewater to be treated, and the other end of the return pipe is connected to the bottom of the return channel; The area above the microporous aerator forms an aeration nitrification-anaerobic ammonium oxidation reaction zone, while the area below the microporous aerator forms an anaerobic ammonium oxidation mixed reaction zone. The inlet point of the mixed liquor return pump is the aeration gas ejection water return section, rather than the mixed liquor aeration section or the bottom mixed liquor aeration area. From the dissolved oxygen gradient: microporous aerator > anaerobic ammonia oxidation packing and bacteria > return pipe > water distributor > effluent weir; From the nitrite concentration gradient: anaerobic ammonia oxidation packing and bacteria > reflux pipe > water distributor > effluent weir; From the ammonia nitrogen concentration gradient: inlet pipe > water distributor > anaerobic ammonia oxidation packing and bacteria > return pipe > outlet weir; A sleeve is provided in the middle of the shell. The anaerobic ammonia oxidation packing material and bacteria are arranged vertically and horizontally with the microporous aerator inside the sleeve. A reflux channel is formed between the sleeve and the shell. Alternatively, the cavity of the sleeve serves as a reflux channel, and the anaerobic ammonia oxidation packing material and bacteria are arranged vertically and horizontally with the microporous aerator inside the cavity between the sleeve and the shell. A baffle is provided below the sleeve. When the anaerobic ammonia oxidation packing material and bacteria are arranged inside the sleeve, the baffle is fixed to the inner wall of the shell and is used to lift the rising flow of the water distributor upward along the middle through the microporous aerator.

2. The integrated biological denitrification reactor as described in claim 1, characterized in that, When the anaerobic ammonia oxidation packing and bacteria are placed outside the sleeve, the baffle plate is fixed at the bottom of the sleeve and is used to lift the rising flow of the water distributor upward along the outside through the microporous aerator.

3. The integrated biological denitrification reactor as described in claim 1, characterized in that, A three-phase separator is provided at the bottom of the outlet weir. An exhaust pipe is connected to the three-phase separator and the gas collection point at the bottom of the shell. An exhaust valve is provided on the exhaust pipe.

4. The integrated biological denitrification reactor as described in claim 1, characterized in that, An inlet pump is installed on the inlet pipe, and a mixed liquor return pump or air-lift return sludge is installed on the return pipe.

5. The integrated biological denitrification reactor as described in claim 1, characterized in that, The upward flow velocity of the bottom mixture formed by the water distributor is 0.5-1.5 m / h.

6. The integrated biological denitrification reactor as described in claim 1, characterized in that, An online dissolved oxygen meter is installed at the top of the reactor to control the dissolved oxygen concentration in the upper and middle reaction zones between 0 and 1.0 mg / L.

7. A high-ammonia nitrogen wastewater treatment system, characterized in that, include: The system comprises a pretreatment system, an ultraviolet sterilization system, an integrated biological denitrification reactor, and a deep treatment system arranged sequentially along the wastewater treatment direction. The integrated biological denitrification reactor is the integrated biological denitrification reactor as described in any one of claims 1 to 6.

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