Denitrification treatment system and method for ammonia-nitrogen wastewater

Abstract

The invention provides a denitrification treatment system and method for ammonia-nitrogen wastewater. The system comprises a water inlet system, a gas inlet system, a short-cut nitrification reaction system, an oxygen elimination precipitation system, a denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system, a high-pressure gas supply system and a water outlet tank, through cooperation of the systems, high-concentration ammonia-nitrogen wastewater is converted into nitrogen and nitrogen-free wastewater, and the nitrogen-free wastewater is discharged to a first preset site through the water outlet tank, so that the denitrification treatment efficiency of the ammonia-nitrogen wastewater is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a system and method for denitrification of ammonia nitrogen wastewater. Background Art

[0002] Ammonia nitrogen wastewater mainly comes from domestic sewage, industrial wastewater, etc., and the nitrogen contained in it exists in the form of organic nitrogen and inorganic nitrogen. Ammonia nitrogen wastewater has significant harm to the environment and organisms: such as eutrophication of water bodies, deterioration of water quality, and harm to biological health. Therefore, how to treat the ammonia nitrogen wastewater generated daily is particularly important.

[0003] In the prior art, the denitrification treatment of ammonia nitrogen wastewater converts the ammonia nitrogen wastewater into nitrogen gas and nitrate through a short-range nitrification-anaerobic ammonia oxidation process, and then converts the nitrate into nitrogen gas through a denitrification process and discharges it, so as to achieve the purpose of denitrification of ammonia nitrogen wastewater.

[0004] However, the short-range nitrification-anaerobic ammonium oxidation process in the prior art does not have the ability to remove nitrates, and a denitrification process needs to be introduced for further removal, resulting in a low denitrification efficiency of ammonia nitrogen wastewater and increased denitrification costs of ammonia nitrogen wastewater. Summary of the invention

[0005] The present application provides a denitrification treatment system and method for ammonia nitrogen wastewater to solve the problem that the short-range nitrification-anaerobic ammonia oxidation process in the prior art does not have the ability to remove nitrates and needs to introduce a denitrification process for further removal, resulting in low denitrification treatment efficiency in ammonia nitrogen wastewater and increased denitrification treatment costs for ammonia nitrogen wastewater.

[0006] In a first aspect, the present application provides a denitrification treatment system for ammonia nitrogen wastewater, comprising: a water inlet system (10), an air inlet system (20), a short-cut nitrification reaction system (30), an oxygen removal sedimentation system (40), a denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50), a high-pressure air supply system (60), and a water outlet tank (70), wherein the short-cut nitrification reaction system (30) comprises ammonia oxidizing bacteria, the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50) comprises anaerobic ammonia oxidizing bacteria and denitrification anaerobic methane oxidizing microorganisms, and the high-pressure air supply system (60) contains at least methane gas;

[0007] The water inlet system (10) is used to receive high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-cut nitrification reaction system (30); and

[0008] The air intake system (20) transports air to the short-range nitration reaction system;

[0009] The short-range nitrification reaction system (30) converts the ammonia nitrogen wastewater into wastewater containing ammonia nitrogen and nitrite nitrogen based on the dissolved oxygen in the ammonia nitrogen wastewater blended by the air and the ammonia oxidizing bacteria; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the deoxidation precipitation system;

[0010] The deoxygenation precipitation system (40) deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen; the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50); and

[0011] The high-pressure gas supply system (60) pumps the methane gas into the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system (50);

[0012] The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system (50) converts the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through the anaerobic ammonium oxidizing bacteria; converts the methane gas into methane microbubbles; based on the dissolved methane in the wastewater dissolved by the methane microbubbles and the denitrification anaerobic methane oxidizing microorganisms, reduces the nitrate nitrogen wastewater into nitrogen gas and nitrogen-free wastewater; and discharges the nitrogen-free wastewater into the outlet tank (70);

[0013] The water outlet box (70) discharges the nitrogen-free wastewater to a first preset site.

[0014] In a possible design, the short-range nitrification reaction system (30) comprises: a short-range nitrification reactor (31), a first water inlet (32), an aeration plate (33), a dissolved oxygen meter (34), a first agitator (35), a first pH meter (36), and a first water outlet (37); wherein the short-range nitrification reactor (31) receives ammonia nitrogen wastewater pumped into the water inlet system (10) through the first water inlet (32); and the short-range nitrification reactor (31) receives air delivered by the air inlet system (20) through the aeration plate (33); the dissolved oxygen meter (34) monitors the concentration of dissolved oxygen dissolved in the ammonia nitrogen wastewater by the air; and the first agitator (35) stirs the ammonia nitrogen wastewater and the ammonia oxidizing bacteria in the short-range nitrification reactor (31) to obtain a mixed solution of the ammonia nitrogen wastewater and the ammonia oxidizing bacteria; The first pH meter (36) monitors the pH value of the mixed solution of the ammonia nitrogen wastewater and the ammonia oxidizing bacteria; the short-range nitrification reactor (31) generates wastewater containing ammonia nitrogen and nitrite nitrogen based on the dissolved oxygen dissolved in the ammonia nitrogen wastewater by the air and the mixed solution of the ammonia nitrogen wastewater and the ammonia oxidizing bacteria; and the wastewater containing ammonia nitrogen and nitrite nitrogen is discharged into the deoxidation sedimentation system (40) through the first water outlet (37).

[0015] In a possible design, the short-cut nitrification reaction system further comprises a sludge return port (38), and the wastewater containing ammonia nitrogen and nitrite nitrogen contains aerobic microorganisms; the deoxygenation sedimentation system (40) comprises: a deoxygenation sedimentation tank (41), an ammonia nitrogen measuring instrument (42), a nitrite nitrogen measuring instrument (43), a sludge return pump (44), a sludge discharge pump (45) and a primary water inlet pump (46); wherein the deoxygenation sedimentation tank (41) receives the wastewater containing ammonia nitrogen and nitrite nitrogen discharged from the short-cut nitrification reaction system (30); aerobic microorganisms in the wastewater containing ammonia nitrogen and nitrite nitrogen are subjected to precipitation treatment to obtain aerobic sludge; the ammonia nitrogen measuring instrument (42) measures the ammonia nitrogen concentration in the wastewater containing ammonia nitrogen and nitrite nitrogen; and the nitrite nitrogen measuring instrument (43) measures the nitrite nitrogen concentration in the wastewater containing ammonia nitrogen and nitrite nitrogen; The deoxygenation sedimentation tank (41) pumps part of the aerobic sludge into the short-range nitrification reaction system (30) through the sludge return pump (44) when the ratio of the nitrite nitrogen concentration to the ammonia nitrogen concentration is less than a first preset value and lasts for a preset time; the remaining aerobic sludge is discharged to a second preset site through the sludge discharge pump (45); and all the aerobic sludge is discharged to the second preset site through the sludge discharge pump (45) when the ratio of the nitrite nitrogen concentration to the ammonia nitrogen concentration is greater than a second preset value and lasts for a preset time; and the deoxygenation sedimentation tank (41) deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater free of dissolved oxygen; and the ammonia nitrogen and nitrite nitrogen wastewater free of dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50) through the primary water inlet pump (46).

[0016] In a possible design, the denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system (50) comprises: a denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reactor (51), a second water inlet (52), a second agitator (53), a polyurethane sponge carrier (54), a fixed support (55), a second pH meter (56), an internal circulation system (57), an internal circulation water outlet (58) and a second water outlet (59); wherein the denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reactor (51) receives the oxygen-free water pumped into the deoxidation sedimentation system (40) through the second water inlet (52). ammonia nitrogen and nitrite nitrogen wastewater; the second agitator (53) is used to stir the ammonia nitrogen and nitrite nitrogen wastewater containing no dissolved oxygen, the anaerobic ammonia oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidation combined reactor (51), so as to convert the ammonia nitrogen and nitrite nitrogen wastewater containing no dissolved oxygen into nitrogen gas by the anaerobic ammonia oxidizing bacteria, and a mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms, wherein the anaerobic ammonia oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms are inoculated on the polyurethane sponge carrier (54), and the polyurethane The ester sponge carrier is fixed on the fixed support (55); the second pH meter (56) monitors the pH value of the mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms; the internal circulation system (57) circulates the nitrate nitrogen wastewater and the mixed solution of the denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) through the second water inlet (52) and the internal circulation water outlet (58) to obtain a circulated mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms; receives the high-pressure gas supply system (60) input methane gas delivered; converting the methane gas into methane microbubbles so that the methane microbubbles are integrated into the circulating mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms to obtain a mixed solution of the nitrate nitrogen wastewater containing dissolved methane and the denitrifying anaerobic methane oxidizing microorganisms; the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) generates nitrogen gas and nitrogen-free wastewater based on the mixed solution of the nitrate nitrogen wastewater containing dissolved methane and the denitrifying anaerobic methane oxidizing microorganisms; and discharging the nitrogen-free wastewater into the water outlet tank (70) through the second water outlet (59).

[0017] In a possible design, the internal circulation system (57) comprises: a membrane assembly (571) and an internal circulation pump (572); the membrane assembly (571) circulates the nitrate nitrogen wastewater and the mixed solution of the denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) in sequence through the internal circulation pump (572), the second water inlet (52) and the internal circulation outlet (58) respectively, so as to obtain a circulated mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms; receives the methane gas delivered by the high-pressure gas supply system (60); converts the methane gas into methane microbubbles, so that the methane microbubbles are integrated into the circulated mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms, so as to obtain a mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms containing dissolved methane.

[0018] In a possible design, the membrane assembly (571) comprises: a third water inlet (5711), a hollow fiber air inlet (5712), a hollow fiber membrane (5713) and a third water outlet (5714); wherein the third water inlet (5711) receives the mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidation microorganisms discharged from the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) through the internal circulation water outlet; the hollow fiber air inlet (5712) receives the methane gas delivered by the high-pressure gas supply system (60); the hollow fiber membrane (5713) 713), converting the methane gas into methane micro-bubbles, so that the methane micro-bubbles are integrated into the circulating mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms, thereby obtaining a mixed solution of the nitrate nitrogen wastewater containing dissolved methane and the denitrifying anaerobic methane oxidizing microorganisms; the third water outlet (5714), through the internal circulation pump (572) and the second water inlet (52), pumps the mixed solution of the nitrate nitrogen wastewater containing dissolved methane and the denitrifying anaerobic methane oxidizing microorganisms into the denitrifying anaerobic methane oxidation combined anaerobic ammonia oxidation reactor (51).

[0019] In a possible design, the water inlet system (10) comprises: a water inlet tank (11) and a secondary water inlet pump (12); the water inlet tank (11) is used to receive the high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-range nitrification reaction system (30) through the secondary water inlet pump (12).

[0020] In a possible design, the air intake system (20) comprises: a blower (21) and a gas flow meter (22); the blower (21) transports air to the short-range nitration reaction system (30); and the gas flow meter (22) is used to detect the flow rate of the air.

[0021] In a possible design, the high-pressure gas supply system (60) comprises: a high-pressure gas cylinder (61) and a gas pressure reducing valve (62); the high-pressure gas cylinder (61) transports the methane gas to the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system (50) through the gas pressure reducing valve (62).

[0022] In a second aspect, the present application provides a method for denitrification of ammonia nitrogen wastewater, which is applied to the denitrification treatment system for ammonia nitrogen wastewater as described in the first aspect, comprising:

[0023] The water inlet system is used to receive high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-range nitrification reaction system; and

[0024] The air intake system transports air to the short-range nitration reaction system;

[0025] The short-range nitrification reaction system converts the ammonia nitrogen wastewater into wastewater containing ammonia nitrogen and nitrite nitrogen according to the dissolved oxygen dissolved in the ammonia nitrogen wastewater by the air and the ammonia oxidizing bacteria; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the deoxidation precipitation system;

[0026] The deoxygenation precipitation system deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen; the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system; and,

[0027] The high-pressure gas supply system pumps the methane gas into the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system;

[0028] The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system converts the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through the anaerobic ammonium oxidizing bacteria; converts the methane gas into methane micro-bubbles; according to the dissolved methane in the wastewater dissolved by the methane micro-bubbles and the denitrification anaerobic methane oxidizing microorganisms, the nitrate nitrogen wastewater is reduced to nitrogen gas and nitrogen-free wastewater; and the nitrogen-free wastewater is discharged into the water outlet tank;

[0029] The water outlet box discharges the nitrogen-free wastewater to a first preset site.

[0030] The denitrification treatment system and method for ammonia nitrogen wastewater provided in the present application improves the denitrification treatment efficiency of ammonia nitrogen wastewater and reduces the denitrification treatment cost of ammonia nitrogen wastewater through the collaboration between the water inlet system, the air inlet system, the short-range nitrification reaction system, the oxygen removal sedimentation system, the denitrification anaerobic methane oxidation combined with the anaerobic ammonia oxidation reaction system, the high-pressure air supply system and the water outlet tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 Schematic diagram of the structure of the ammonia nitrogen wastewater denitrification treatment system provided in the embodiment of the present application Figure 1 ;

[0033] Figure 2 Schematic diagram of the structure of the ammonia nitrogen wastewater denitrification treatment system provided in the embodiment of the present application Figure 2 ;

[0034] Figure 3 A schematic flow chart of a method for denitrification of ammonia nitrogen wastewater provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Ammonia nitrogen wastewater refers to wastewater containing ammonia or nitrogen compounds in the form of ions. Ammonia nitrogen wastewater mainly comes from domestic sewage, industrial wastewater, etc., and the nitrogen elements contained therein exist in the form of organic nitrogen and inorganic nitrogen. Ammonia nitrogen wastewater has significant harm to the environment and organisms: such as eutrophication of water bodies, deterioration of water quality, and harm to biological health. Therefore, how to treat the ammonia nitrogen wastewater generated daily is particularly important. In the prior art, the traditional denitrification treatment of ammonia nitrogen wastewater is mainly to convert ammonia nitrogen wastewater into nitrogen and nitrate through a short-range nitrification-anaerobic ammonia oxidation process, and then convert nitrate into nitrogen gas and discharge it through a denitrification process to achieve the purpose of denitrification of ammonia nitrogen wastewater. However, the short-range nitrification-anaerobic ammonia oxidation process in the prior art does not have the ability to remove nitrates, and needs to introduce a denitrification process for further removal, resulting in a low denitrification treatment efficiency of ammonia nitrogen wastewater and an increase in the denitrification treatment cost of ammonia nitrogen wastewater.

[0037] In order to solve the above-mentioned technical problems, the embodiments of the present application propose the following technical concepts: Taking into account the low denitrification treatment efficiency of ammonia nitrogen wastewater in the prior art, the inventors construct a denitrification treatment system for ammonia nitrogen wastewater based on a water inlet system, an air inlet system, a short-range nitrification reaction system, an oxygen removal sedimentation system, a denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system, a high-pressure air supply system and a water outlet tank, and use the denitrification treatment system for ammonia nitrogen wastewater to denitrify the ammonia nitrogen wastewater, thereby improving the denitrification treatment efficiency of the ammonia nitrogen wastewater and reducing the cost.

[0038] Figure 1 Schematic diagram of the structure of the ammonia nitrogen wastewater denitrification treatment system provided in the embodiment of the present application Figure 1 .

[0039] like Figure 1 As shown, the denitrification treatment system for ammonia nitrogen wastewater includes: a water inlet system 10, an air inlet system 20, a short-range nitrification reaction system 30, an oxygen removal sedimentation system 40, a denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system 50, a high-pressure gas supply system 60 and a water outlet tank 70, wherein the short-range nitrification reaction system 30 includes ammonia oxidizing bacteria, the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system 50 includes anaerobic ammonia oxidizing bacteria and denitrification anaerobic methane oxidizing microorganisms, and the high-pressure gas supply system 60 contains at least methane gas.

[0040] The water inlet system 10 is used to receive high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-range nitrification reaction system 30; and

[0041] The air intake system 20 delivers air to the short-range nitration reaction system 30 .

[0042] The short-range nitrification reaction system 30 converts the ammonia nitrogen wastewater into wastewater containing ammonia nitrogen and nitrite nitrogen according to the dissolved oxygen and ammonia oxidizing bacteria in the ammonia nitrogen wastewater blended by air; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the oxygen removal and precipitation system 40.

[0043] The deoxygenation precipitation system 40 deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen; the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system 50; and,

[0044] The high-pressure gas supply system 60 pumps the methane gas into the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system 50 .

[0045] The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system 50 converts ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through anaerobic ammonium oxidizing bacteria; converts methane gas into methane micro bubbles; based on the methane micro bubbles dissolving into dissolved methane in the wastewater and denitrification anaerobic methane oxidizing microorganisms, the nitrate nitrogen wastewater is reduced to nitrogen gas and nitrogen-free wastewater; and the nitrogen-free wastewater is discharged into the outlet tank 70.

[0046] In this embodiment, the denitrifying anaerobic methane oxidizing microorganisms include denitrifying anaerobic methane oxidizing archaea and denitrifying anaerobic methane oxidizing bacteria.

[0047] Among them, denitrifying anaerobic methane-oxidizing archaea can reduce nitrate nitrogen to nitrite nitrogen through methane; denitrifying anaerobic methane-oxidizing bacteria can reduce nitrite nitrogen to nitrogen gas.

[0048] The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system 50 converts ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through anaerobic ammonium oxidizing bacteria; converts methane gas into methane microbubbles; reduces nitrate nitrogen wastewater into nitrite nitrogen wastewater according to the dissolved methane and denitrifying anaerobic methane oxidizing archaea dissolved in the wastewater by the methane microbubbles; reduces nitrite nitrogen wastewater into nitrogen gas and nitrogen-free wastewater according to the dissolved methane and denitrifying anaerobic methane oxidizing bacteria dissolved in the wastewater by the methane microbubbles; and discharges the nitrogen-free wastewater into the outlet tank 70.

[0049] The water outlet box 70 discharges the nitrogen-free wastewater to the first preset site.

[0050] Exemplarily, the first preset site may be a nitrogen-free wastewater treatment pond.

[0051] In summary, the denitrification treatment system for ammonia nitrogen wastewater provided in this embodiment improves the denitrification treatment efficiency of ammonia nitrogen wastewater and reduces the denitrification treatment cost of ammonia nitrogen wastewater through the collaboration between the water inlet system, the air inlet system, the short-range nitrification reaction system, the oxygen removal sedimentation system, the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system, the high-pressure air supply system and the water outlet tank.

[0052] In addition, the denitrification treatment system for ammonia nitrogen wastewater provided in this embodiment adds denitrifying anaerobic methane oxidizing microorganisms, which can directly reduce the nitrate nitrogen by-product of anaerobic ammonia oxidation to nitrogen gas, and can achieve complete denitrification without adding additional treatment units, thereby improving the denitrification treatment efficiency of ammonia nitrogen wastewater.

[0053] In addition, in the denitrification treatment system for ammonia nitrogen wastewater provided in this embodiment, when the ratio of nitrite nitrogen to ammonia nitrogen exceeds 1.32, the denitrifying anaerobic methane oxidizing microorganisms can remove excess nitrite nitrogen. If the effluent from the short-term nitrification system contains nitrate nitrogen, it can also be removed by the denitrifying anaerobic methane oxidizing microorganisms. Therefore, the control requirements for the short-term nitrification process are lower, making denitrification more stable.

[0054] Figure 2 Schematic diagram of the structure of the ammonia nitrogen wastewater denitrification treatment system provided in the embodiment of the present application Figure 2 In the embodiment of the present application, Figure 1 Based on the provided embodiment, the short-range nitrification reaction system 30 includes: a short-range nitrification reactor 31, a first water inlet 32, an aeration plate 33, a dissolved oxygen meter 34, a first agitator 35, a first pH meter 36 and a first water outlet 37.

[0055] The short-range nitrification reactor 31 receives ammonia nitrogen wastewater pumped into the water inlet system 10 through the first water inlet 32; and

[0056] The short-range nitrification reactor 31 receives air delivered by the air intake system 20 through the aeration disk 33 .

[0057] The dissolved oxygen meter 34 monitors the concentration of dissolved oxygen in the ammonia nitrogen wastewater by air dissolving.

[0058] In this embodiment, the dissolved oxygen concentration is controlled in the range of 0.2 mg / L-0.5 mg / L.

[0059] The first agitator 35 agitates the ammonia nitrogen wastewater and ammonia oxidizing bacteria in the short-path nitrification reactor 31 to obtain a mixed solution of the ammonia nitrogen wastewater and ammonia oxidizing bacteria.

[0060] The first pH meter 36 monitors the pH value of the mixed solution of the ammonia nitrogen wastewater and the ammonia oxidizing bacteria.

[0061] The short-range nitrification reactor 31 generates wastewater containing ammonia nitrogen and nitrite nitrogen based on the dissolved oxygen in the ammonia nitrogen wastewater blended by air and the mixed solution of the ammonia nitrogen wastewater and ammonia oxidizing bacteria; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the deoxidation precipitation system 40 through the first water outlet 37.

[0062] Continue to refer Figure 2 The short-range nitrification reaction system also includes a sludge return port 38, and the wastewater containing ammonia nitrogen and nitrite nitrogen contains aerobic microorganisms; the oxygen removal sedimentation system 40 includes: an oxygen removal sedimentation tank 41, an ammonia nitrogen meter 42, a nitrite nitrogen meter 43, a sludge return pump 44, a sludge discharge pump 45 and a primary water inlet pump 46.

[0063] The oxygen removal sedimentation tank 41 receives the wastewater containing ammonia nitrogen and nitrite nitrogen discharged from the short-range nitrification reaction system 30; and performs sedimentation treatment on aerobic microorganisms in the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain aerobic sludge.

[0064] an ammonia nitrogen measuring instrument 42 for measuring the ammonia nitrogen concentration in the wastewater containing ammonia nitrogen and nitrite nitrogen; and

[0065] The nitrite nitrogen measuring instrument 43 measures the nitrite nitrogen concentration in the wastewater containing ammonia nitrogen and nitrite nitrogen.

[0066] The deoxygenation sedimentation tank 41, when the ratio of the nitrite nitrogen concentration to the ammonia nitrogen concentration is less than the first preset value and lasts for a preset time, pumps part of the aerobic sludge into the short-range nitrification reaction system 30 through the sludge return pump 44; discharges the remaining aerobic sludge to the second preset site through the sludge discharge pump 45; when the ratio of the nitrite nitrogen concentration to the ammonia nitrogen concentration is greater than the second preset value and lasts for a preset time, discharges all the aerobic sludge to the second preset site through the sludge discharge pump 45; and,

[0067] Exemplarily, the second preset site may be a sludge treatment tank.

[0068] In this embodiment, the first preset value is 1.2; the second preset value is 1.4; and the preset time is 2 hours.

[0069] Specifically, in the deoxygenation sedimentation tank 41, when the ratio of the nitrite nitrogen concentration to the ammonia nitrogen concentration is less than 1.2 and lasts for 2 hours, a part of the aerobic sludge is pumped into the short-cut nitrification reaction system 30 through the sludge return pump 44; the remaining aerobic sludge is discharged to the second preset site through the sludge discharge pump 45. In addition, the air volume of the air intake system 20 is increased to promote the short-cut nitrification process.

[0070] When the ratio of nitrite nitrogen concentration to ammonia nitrogen concentration is greater than 1.4 and lasts for 2 hours, all aerobic sludge is discharged to the second preset site through the sludge pump 45. In addition, the sludge return pump 44 is turned off, and the air volume of the air intake system 20 is reduced to inhibit the short-range nitrification process and ensure that the ratio of nitrite nitrogen concentration to ammonia nitrogen concentration is stable in the range of 1.2-1.4.

[0071] The deoxygenation sedimentation tank 41 deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen; the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system 50 through the primary water inlet pump 46.

[0072] In this embodiment, in the oxygen removal sedimentation tank 41, the ammonia oxidizing bacteria carried in the effluent water can further consume oxygen to eliminate the remaining dissolved oxygen.

[0073] Continue to refer Figure 2 The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system 50 includes: a denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reactor 51, a second water inlet 52, a second agitator 53, a polyurethane sponge carrier 54, a fixed bracket 55, a second pH meter 56, an internal circulation system 57, an internal circulation water outlet 58 and a second water outlet 59.

[0074] The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reactor 51 receives the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen pumped into the deoxidation precipitation system 40 through the second water inlet 52 .

[0075] The second agitator 53 stirs the ammonia nitrogen and nitrite nitrogen wastewater containing no dissolved oxygen, the anaerobic ammonia oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51, so as to convert the ammonia nitrogen and nitrite nitrogen wastewater containing no dissolved oxygen into nitrogen gas and a mixed solution of nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms through the anaerobic ammonia oxidizing bacteria, wherein the anaerobic ammonia oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms are inoculated on a polyurethane sponge carrier 54, and the polyurethane sponge carrier is fixed on a fixed bracket 55.

[0076] In this embodiment, the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51 is inoculated with flocculent sludge at the initial stage of operation. Since the polyurethane sponge carrier 54 provides a good environment for the growth of bacteria, as the device operates, the bacteria will gradually adhere to the surface of the carrier and form a biofilm. The formation of the biofilm can effectively reduce the loss of bacteria with the effluent, so as to ensure that the bacteria are retained in the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51.

[0077] The second pH meter 56 monitors the pH value of the mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms.

[0078] In this embodiment, 1M hydrochloric acid or 1N sodium hydroxide is added according to the pH value change of the mixed solution of nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms to adjust the pH value to the range of 7.0-7.5.

[0079] The internal circulation system 57 circulates the nitrate nitrogen wastewater and the mixed solution of denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51 through the second water inlet 52 and the internal circulation water outlet 58 to obtain a circulating mixed solution of nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms; receives methane gas delivered by the high-pressure gas supply system 60; converts the methane gas into methane fine bubbles so that the methane fine bubbles are integrated into the circulating nitrate nitrogen wastewater and the mixed solution of denitrifying anaerobic methane oxidizing microorganisms to obtain a mixed solution of nitrate nitrogen wastewater containing dissolved methane and denitrifying anaerobic methane oxidizing microorganisms.

[0080] In addition, the height of the second water inlet 52 may be higher than the internal circulation water outlet 58 .

[0081] The denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51 generates nitrogen gas and nitrogen-free wastewater based on the mixed solution of nitrate nitrogen wastewater containing dissolved methane and denitrification anaerobic methane oxidation microorganisms; and discharges the nitrogen-free wastewater into the water outlet tank 70 through the second water outlet 59.

[0082] In addition, if ammonia oxidizing bacteria in the short-range nitrification reactor 31 oxidize part of the nitrite nitrogen into nitrate nitrogen, denitrifying anaerobic methane oxidizing microorganisms can use methane to reduce it into nitrogen gas to ensure stable effluent water quality.

[0083] Continue to refer Figure 2 The internal circulation system 57 includes: a membrane assembly 571 and an internal circulation pump 572 .

[0084] The membrane assembly 571 circulates the mixed solution of nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51 in sequence through the internal circulation pump 572, the second water inlet 52 and the internal circulation outlet 58 respectively, so as to obtain a circulating mixed solution of nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms; receives methane gas delivered by the high-pressure gas supply system 60; converts the methane gas into methane micro bubbles, so that the methane micro bubbles are integrated into the circulating mixed solution of nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms, and obtains a mixed solution of nitrate nitrogen wastewater containing dissolved methane and denitrifying anaerobic methane oxidizing microorganisms.

[0085] Continue to refer Figure 2The membrane assembly 571 includes: a third water inlet 5711, a hollow fiber air inlet 5712, a hollow fiber membrane 5713 and a third water outlet 5714.

[0086] The third water inlet 5711 receives the mixed solution of nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms discharged from the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51 through the internal circulation water outlet.

[0087] The hollow fiber gas inlet 5712 receives the methane gas delivered by the high-pressure gas supply system 60 .

[0088] The hollow fiber membrane 5713 converts methane gas into methane microbubbles, so that the methane microbubbles are integrated into the mixed solution of the circulating nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms, thereby obtaining a mixed solution of the nitrate nitrogen wastewater containing dissolved methane and the denitrifying anaerobic methane oxidizing microorganisms.

[0089] The third water outlet 5714 pumps the mixed solution of nitrate nitrogen wastewater containing dissolved methane and denitrifying anaerobic methane oxidizing microorganisms into the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor 51 through the internal circulation pump 572 and the second water inlet 52 .

[0090] Continue to refer Figure 2 The water inlet system 10 comprises a water inlet tank 11 and a secondary water inlet pump 12 .

[0091] The water inlet tank 11 is used to receive high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-range nitrification reaction system 30 through the secondary water inlet pump 12.

[0092] Continue to refer Figure 2 The air intake system 20 includes a blower 21 and a gas flow meter 22 .

[0093] The blower 21 transports air to the short-range nitrification reaction system 30 .

[0094] The gas flow meter 22 is used to detect the flow rate of air.

[0095] Continue to refer Figure 2 The high-pressure gas supply system 60 includes a high-pressure gas cylinder 61 and a gas pressure reducing valve 62 .

[0096] The high-pressure gas cylinder 61 transports the methane gas to the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system 50 through the gas pressure reducing valve 62 .

[0097] In this embodiment, the high-pressure gas cylinder 61 is also filled with carbon dioxide, and the volume ratio of methane to carbon dioxide is 95:5.

[0098] Among them, carbon dioxide can provide a carbon source for denitrifying anaerobic methane-oxidizing microorganisms and anaerobic ammonium-oxidizing bacteria to synthesize cell substances.

[0099] In summary, the denitrification treatment system for ammonia nitrogen wastewater provided in this embodiment improves the denitrification treatment efficiency of ammonia nitrogen wastewater and reduces the denitrification treatment cost of ammonia nitrogen wastewater through the collaboration between the water inlet system, the air inlet system, the short-range nitrification reaction system, the oxygen removal sedimentation system, the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system, the high-pressure air supply system and the specific components in the water outlet tank.

[0100] In addition, the denitrification treatment system for ammonia nitrogen wastewater provided in this embodiment converts methane gas into methane microbubbles through hollow fiber membranes, so that the methane microbubbles are integrated into the mixed liquid of circulating nitrate nitrogen wastewater and denitrifying anaerobic methane oxidizing microorganisms, thereby improving the utilization efficiency of methane gas.

[0101] In addition, the denitrification treatment system for ammonia nitrogen wastewater provided in this embodiment uses a polyurethane sponge carrier and a fixed bracket to provide an attachment environment for denitrifying anaerobic methane oxidizing microorganisms and anaerobic ammonia oxidizing bacteria to promote the formation of biofilms, which can maximize the retention of biomass, accelerate the enrichment process of microorganisms and ensure the stability of the operation of the denitrification treatment system for ammonia nitrogen wastewater.

[0102] Figure 3 A schematic diagram of a process for treating ammonia nitrogen wastewater by denitrification provided in an embodiment of the present application. The execution subject of this embodiment can be Figure 1 The denitrification treatment system for ammonia nitrogen wastewater in the embodiment shown is not particularly limited in this embodiment. Figure 3 As shown, the method includes:

[0103] S301: water inlet system, used to receive high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-range nitrification reaction system; and,

[0104] S302: Air intake system, transporting air to the short-range nitration reaction system.

[0105] S303: Short-range nitrification reaction system, which converts the ammonia nitrogen wastewater into wastewater containing ammonia nitrogen and nitrite nitrogen based on the dissolved oxygen and ammonia oxidizing bacteria dissolved in the ammonia nitrogen wastewater by air; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the oxygen removal and sedimentation system.

[0106] S304: deoxygenation precipitation system, deoxygenating the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen; pumping the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system; and,

[0107] S305: High-pressure gas supply system, pumping methane gas into the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system.

[0108] S306: Denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system, which converts ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through anaerobic ammonium oxidizing bacteria; converts methane gas into methane micro bubbles; based on the methane micro bubbles dissolving into dissolved methane in the wastewater and denitrification anaerobic methane oxidizing microorganisms, reduces nitrate nitrogen wastewater into nitrogen gas and nitrogen-free wastewater; and discharges nitrogen-free wastewater into the outlet tank.

[0109] S307: The water outlet tank discharges the nitrogen-free wastewater to the first preset site.

[0110] In summary, the denitrification treatment method for ammonia nitrogen wastewater provided in this embodiment is to pump the ammonia nitrogen wastewater into the short-range nitrification reaction system through the water inlet system; and the air inlet system transports air to the short-range nitrification reaction system; the short-range nitrification reaction system converts the ammonia nitrogen wastewater into wastewater containing ammonia nitrogen and nitrite nitrogen according to dissolved oxygen and ammonia oxidizing bacteria; the wastewater containing ammonia nitrogen and nitrite nitrogen is discharged into the deoxygenation precipitation system; the deoxygenation precipitation system deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen, and pumps it into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system system; and, a high-pressure gas supply system, pumps methane gas into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system; the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system, converts ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through anaerobic ammonia oxidizing bacteria; according to methane and denitrification anaerobic methane oxidizing microorganisms, the nitrate nitrogen wastewater is reduced to nitrogen gas and nitrogen-free wastewater; the nitrogen-free wastewater is discharged into the outlet tank; the outlet tank, discharges the nitrogen-free wastewater to the first preset site, thereby improving the denitrification treatment efficiency of the ammonia nitrogen wastewater and reducing the denitrification treatment cost of the ammonia nitrogen wastewater.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A denitrification treatment system for ammonia nitrogen wastewater, characterized in that: include: A water inlet system (10), an air inlet system (20), a short-cut nitrification reaction system (30), an oxygen removal sedimentation system (40), a denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50), a high-pressure air supply system (60), and a water outlet tank (70), wherein the short-cut nitrification reaction system (30) includes ammonia oxidizing bacteria, the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50) includes anaerobic ammonia oxidizing bacteria and denitrification anaerobic methane oxidizing microorganisms, and the high-pressure air supply system (60) contains at least methane gas; The water inlet system (10) is used to receive high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-cut nitrification reaction system (30); and The air intake system (20) transports air to the short-range nitration reaction system; The short-range nitrification reaction system (30) converts the ammonia nitrogen wastewater into wastewater containing ammonia nitrogen and nitrite nitrogen based on the dissolved oxygen in the ammonia nitrogen wastewater blended by the air and the ammonia oxidizing bacteria; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the deoxidation precipitation system; The deoxygenation precipitation system (40) deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen; the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50); and The high-pressure gas supply system (60) pumps the methane gas into the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system (50); The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system (50) converts the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through the anaerobic ammonium oxidizing bacteria; converts the methane gas into methane microbubbles; based on the dissolved methane in the wastewater dissolved by the methane microbubbles and the denitrification anaerobic methane oxidizing microorganisms, reduces the nitrate nitrogen wastewater into nitrogen gas and nitrogen-free wastewater; and discharges the nitrogen-free wastewater into the outlet tank (70); The water outlet box (70) discharges the nitrogen-free wastewater to a first preset site.

2. The denitrification treatment system for ammonia nitrogen wastewater according to claim 1, characterized in that: The short-range nitrification reaction system (30) comprises: a short-range nitrification reactor (31), a first water inlet (32), an aeration plate (33), a dissolved oxygen meter (34), a first stirrer (35), a first pH meter (36) and a first water outlet (37); The short-range nitrification reactor (31) receives ammonia nitrogen wastewater pumped into the water inlet system (10) through the first water inlet (32); and The short-range nitrification reactor (31) receives air delivered by the air intake system (20) through the aeration plate (33); The dissolved oxygen meter (34) monitors the concentration of dissolved oxygen in the ammonia nitrogen wastewater dissolved in the air; The first agitator (35) agitates the ammonia nitrogen wastewater and the ammonia oxidizing bacteria in the short-range nitrification reactor (31) to obtain a mixed solution of the ammonia nitrogen wastewater and the ammonia oxidizing bacteria; The first pH meter (36) monitors the pH value of the mixed solution of the ammonia nitrogen wastewater and the ammonia oxidizing bacteria; The short-range nitrification reactor (31) generates wastewater containing ammonia nitrogen and nitrite nitrogen based on the dissolved oxygen in the ammonia nitrogen wastewater blended by the air and the mixed solution of the ammonia nitrogen wastewater and the ammonia oxidizing bacteria; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the deoxidation precipitation system (40) through the first water outlet (37).

3. The denitrification treatment system for ammonia nitrogen wastewater according to claim 2, characterized in that: The short-cut nitrification reaction system further comprises a sludge return port (38), and the wastewater containing ammonia nitrogen and nitrite nitrogen contains aerobic microorganisms; the deoxygenation sedimentation system (40) comprises: a deoxygenation sedimentation tank (41), an ammonia nitrogen measuring instrument (42), a nitrite nitrogen measuring instrument (43), a sludge return pump (44), a sludge discharge pump (45) and a primary water inlet pump (46); The deoxygenation sedimentation tank (41) receives the wastewater containing ammonia nitrogen and nitrite nitrogen discharged from the short-cut nitrification reaction system (30); performs precipitation treatment on aerobic microorganisms in the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain aerobic sludge; The ammonia nitrogen measuring instrument (42) measures the ammonia nitrogen concentration in the wastewater containing ammonia nitrogen and nitrite nitrogen; and The nitrite nitrogen measuring instrument (43) measures the nitrite nitrogen concentration in the wastewater containing ammonia nitrogen and nitrite nitrogen; The deoxygenation sedimentation tank (41), when the ratio of the nitrite nitrogen concentration to the ammonia nitrogen concentration is less than a first preset value and lasts for a preset time, pumps part of the aerobic sludge into the short-range nitrification reaction system (30) through the sludge return pump (44); discharges the remaining aerobic sludge to a second preset location through the sludge discharge pump (45); when the ratio of the nitrite nitrogen concentration to the ammonia nitrogen concentration is greater than a second preset value and lasts for a preset time, discharges all the aerobic sludge to the second preset location through the sludge discharge pump (45); and The deoxygenation sedimentation tank (41) deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater free of dissolved oxygen; and the ammonia nitrogen and nitrite nitrogen wastewater free of dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system (50) through the primary water inlet pump (46).

4. The denitrification treatment system for ammonia nitrogen wastewater according to claim 3, characterized in that: The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system (50) comprises: a denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reactor (51), a second water inlet (52), a second agitator (53), a polyurethane sponge carrier (54), a fixed bracket (55), a second pH meter (56), an internal circulation system (57), an internal circulation water outlet (58) and a second water outlet (59); The denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) receives the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen pumped into the deoxygenation precipitation system (40) through the second water inlet (52); The second agitator (53) is used to agitate the ammonia nitrogen and nitrite nitrogen wastewater containing no dissolved oxygen, the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidizing combined reactor (51), so as to convert the ammonia nitrogen and nitrite nitrogen wastewater containing no dissolved oxygen into nitrogen gas and a mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms through the anaerobic ammonium oxidizing bacteria, wherein the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms are inoculated on the polyurethane sponge carrier (54), and the polyurethane sponge carrier is fixed on the fixing bracket (55); The second pH meter (56) monitors the pH value of the mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms; The internal circulation system (57) circulates the mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidizing combined anaerobic ammonium oxidation reactor (51) through the second water inlet (52) and the internal circulation water outlet (58) to obtain a circulated mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms; receives the methane gas delivered by the high-pressure gas supply system (60); converts the methane gas into methane fine bubbles, so that the methane fine bubbles are integrated into the circulated mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms to obtain a mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms containing dissolved methane; The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reactor (51) generates nitrogen gas and nitrogen-free wastewater based on the mixed solution of the nitrate nitrogen wastewater containing dissolved methane and the denitrification anaerobic methane oxidation microorganisms; and discharges the nitrogen-free wastewater into the water outlet tank (70) through the second water outlet (59).

5. The denitrification treatment system for ammonia nitrogen wastewater according to claim 4, characterized in that: The internal circulation system (57) comprises: a membrane assembly (571) and an internal circulation pump (572); The membrane assembly (571) circulates the nitrate nitrogen wastewater and the mixed solution of the denitrifying anaerobic methane oxidizing microorganisms in the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) in sequence through the internal circulation pump (572), the second water inlet (52) and the internal circulation outlet (58) respectively, so as to obtain a circulated mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms; receives the methane gas delivered by the high-pressure gas supply system (60); converts the methane gas into methane micro-bubbles, so that the methane micro-bubbles are integrated into the circulated mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms, so as to obtain a mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms containing dissolved methane.

6. The denitrification treatment system for ammonia nitrogen wastewater according to claim 5, characterized in that: The membrane assembly (571) comprises: a third water inlet (5711), a hollow fiber air inlet (5712), a hollow fiber membrane (5713) and a third water outlet (5714); The third water inlet (5711) receives the mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms discharged from the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) through the internal circulation water outlet; The hollow fiber air inlet (5712) receives the methane gas delivered by the high-pressure gas supply system (60); The hollow fiber membrane (5713) converts the methane gas into methane microbubbles, so that the methane microbubbles are integrated into the circulating mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms, thereby obtaining a mixed solution of the nitrate nitrogen wastewater and the denitrifying anaerobic methane oxidizing microorganisms containing dissolved methane; The third water outlet (5714) pumps the mixed solution of the nitrate nitrogen wastewater containing dissolved methane and the denitrifying anaerobic methane oxidizing microorganisms into the denitrifying anaerobic methane oxidation combined anaerobic ammonium oxidation reactor (51) through the internal circulation pump (572) and the second water inlet (52).

7. The denitrification treatment system for ammonia nitrogen wastewater according to claim 1, characterized in that: The water inlet system (10) comprises: a water inlet tank (11) and a secondary water inlet pump (12); The water inlet tank (11) is used to receive the high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-range nitrification reaction system (30) through the secondary water inlet pump (12).

8. The denitrification treatment system for ammonia nitrogen wastewater according to claim 1, characterized in that: The air intake system (20) comprises: a blower (21) and a gas flow meter (22); The blower (21) transports air to the short-range nitrification reaction system (30); The gas flow meter (22) is used to detect the flow rate of the air.

9. The denitrification treatment system for ammonia nitrogen wastewater according to any one of claims 1 to 8, characterized in that: The high-pressure gas supply system (60) comprises: a high-pressure gas cylinder (61) and a gas pressure reducing valve (62); The high-pressure gas cylinder (61) transports the methane gas to the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system (50) through the gas pressure reducing valve (62).

10. A method for denitrification of ammonia nitrogen wastewater, characterized in that: The denitrification treatment system for ammonia nitrogen wastewater as claimed in claim 1 comprises: The water inlet system is used to receive high-concentration ammonia nitrogen wastewater and pump the ammonia nitrogen wastewater into the short-cut nitrification reaction system; and The air intake system transports air to the short-range nitration reaction system; The short-range nitrification reaction system converts the ammonia nitrogen wastewater into wastewater containing ammonia nitrogen and nitrite nitrogen according to the dissolved oxygen dissolved in the ammonia nitrogen wastewater by the air and the ammonia oxidizing bacteria; and discharges the wastewater containing ammonia nitrogen and nitrite nitrogen into the deoxidation precipitation system; The deoxygenation precipitation system deoxygenates the wastewater containing ammonia nitrogen and nitrite nitrogen to obtain ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen; the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen is pumped into the denitrification anaerobic methane oxidation combined anaerobic ammonia oxidation reaction system; and, The high-pressure gas supply system pumps the methane gas into the denitrification anaerobic methane oxidation combined anaerobic ammonium oxidation reaction system; The denitrification anaerobic methane oxidation combined with anaerobic ammonium oxidation reaction system converts the ammonia nitrogen and nitrite nitrogen wastewater without dissolved oxygen into nitrogen gas and nitrate nitrogen wastewater through the anaerobic ammonium oxidizing bacteria; converts the methane gas into methane micro-bubbles; according to the dissolved methane in the wastewater dissolved by the methane micro-bubbles and the denitrification anaerobic methane oxidizing microorganisms, the nitrate nitrogen wastewater is reduced to nitrogen gas and nitrogen-free wastewater; and the nitrogen-free wastewater is discharged into the water outlet tank; The water outlet box discharges the nitrogen-free wastewater to a first preset site.

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