Denitrification treatment system and method for nitrogen-containing sewage

Abstract

The invention provides a denitrification treatment system and method for nitrogen-containing sewage. The system comprises a water inlet system, a gas supply system, a biological membrane reaction system and a water outlet tank, through cooperation of the systems, nitrogen-containing sewage is converted into nitrogen and nitrogen-free sewage, and the nitrogen-free sewage is discharged to a preset site through the water outlet tank, so that the nitrogen removal treatment efficiency of the nitrogen-containing sewage is improved.

Description

Technical Field

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

[0002] Nitrogenous wastewater refers to wastewater containing nitrogen compounds, mainly including ammonia nitrogen and organic nitrogen. Nitrogenous wastewater mainly comes from domestic sewage, agricultural drainage and industrial wastewater. Nitrogenous wastewater has caused serious pollution and damage to the environment and ecosystem. Therefore, how to treat nitrogenous wastewater generated daily is particularly important.

[0003] In the prior art, the traditional denitrification treatment of nitrogen-containing wastewater mainly involves oxidizing the nitrogen-containing wastewater into nitrate wastewater through a nitrification-denitrification process, and then using organic carbon as an electron donor to reduce the nitrate wastewater into nitrogen gas and nitrogen-free wastewater.

[0004] However, the nitrification-denitrification process in the prior art requires a large amount of organic carbon to participate in the denitrification process, resulting in low denitrification efficiency of nitrogen-containing wastewater and increased denitrification costs. Summary of the invention

[0005] The present application provides a denitrification treatment system and method for nitrogen-containing wastewater to solve the problem that the nitrification-denitrification process in the prior art requires a large amount of organic carbon to participate in the denitrification process, resulting in low denitrification treatment efficiency of nitrogen-containing wastewater and increased denitrification costs.

[0006] In a first aspect, the present application provides a denitrification treatment system for nitrogen-containing wastewater, comprising: a water inlet system (10), an air supply system (20), a biofilm reaction system (30), and a water outlet tank (40), wherein the biofilm reaction system (30) contains denitrifying anaerobic methane oxidizing microorganisms and anaerobic ammonia oxidizing bacteria, and the air supply system (20) contains methane gas;

[0007] Wherein, the water inlet system (10) is used to receive nitrogen-containing wastewater and pump the nitrogen-containing wastewater into the biofilm reaction system (30);

[0008] The biofilm reaction system (30) is configured to culture the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-adding a culture material to obtain the cultured anaerobic ammonium oxidizing bacteria and the cultured denitrifying anaerobic methane oxidizing microorganisms; convert the nitrogen-containing sewage into nitrogen gas and a nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; and stir and fuse the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing the denitrifying anaerobic methane oxidizing microorganisms and nitrates;

[0009] A gas supply system (20) for delivering the methane gas to the biofilm reaction system (30);

[0010] The biofilm reaction system (30) converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generates nitrogen gas and nitrogen-free sewage based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and discharges the nitrogen-free sewage into the outlet tank (40);

[0011] The water outlet box (40) discharges the nitrogen-free sewage to a preset site.

[0012] In a possible design, the biofilm reaction system (30) comprises: a biofilm reaction device (31) and an internal circulation system (32); wherein the biofilm reaction device (31) culture the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-adding culture to obtain the cultured anaerobic ammonium oxidizing bacteria and the cultured denitrifying anaerobic methane oxidizing microorganisms; convert the nitrogen-containing wastewater into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; stir and fuse the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; discharge the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates into the internal circulation system (32); the internal circulation system (32) receives the gas supply system The methane gas transported by the system (20); converting the methane gas into fine methane bubbles; blending the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; pumping the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device (31); the biofilm reaction device (31) generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generating nitrogen gas and nitrogen-free sewage based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and discharging the nitrogen-free sewage into the outlet tank (40).

[0013] In a possible design, the biofilm reaction device (31) comprises: a bioreactor (311), a first water inlet (312), a high-density polyethylene filler (313), a stirrer (314), a pH meter (315), an internal circulation water outlet (316) and a first water outlet (317), wherein the stirrer (314) and the pH meter (315) are arranged inside the bioreactor (311); wherein the bioreactor (311) receives the nitrogen-containing wastewater pumped into the water inlet system (10) through the first water inlet (312); and the anaerobic ammonium-oxidizing bacteria and the denitrifying anaerobic methane-oxidizing microorganisms are cultured by pre-dosing a culture medium to obtain the cultured anaerobic ammonium-oxidizing bacteria and the cultured denitrifying anaerobic methane-oxidizing microorganisms. aerobic methane oxidizing microorganisms, wherein the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms are cultured on the high-density polyethylene filler (313); the nitrogen-containing sewage is converted into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; the agitator (314) agitates and fuses the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrate; the pH meter (315) measures the pH value of the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrate; the bioreactor (311) discharges the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrate into the internal circulation system (32) through the internal circulation water outlet (316); The internal circulation system (32) receives the methane gas delivered by the gas supply system (20); converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the bioreactor (311); the bioreactor (311) generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generates nitrogen gas and nitrogen-free sewage based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and discharges the nitrogen-free sewage into the water outlet tank (40) through the first water outlet (317).

[0014] In a possible design, the internal circulation system (32) comprises: an aeration system (321), an internal circulation pump (322) and a three-way valve (323); the aeration system (321) receives the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates discharged from the biofilm reaction device (31); receives the methane gas delivered by the gas supply system (20); converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device (31) through the internal circulation pump (322) and the three-way valve (323).

[0015] In a possible design, the aeration system (321) comprises: an aerator (3211), a second water inlet (3212), an air inlet (3213), a hollow fiber membrane (3214), and a second water outlet (3215), wherein the hollow fiber membrane (3214) is arranged inside the aerator (3211); the aerator (3211) receives the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates discharged from the biofilm reaction device (31) through the second water inlet (3212); and, The hollow fiber membrane (3214) receives the methane gas delivered by the gas supply system (20) through the gas inlet (3213); converts the methane gas into fine methane bubbles; fills the fine methane bubbles into the aerator (3211); the aerator (3211) blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device (31) through the second water outlet (3215), the internal circulation pump (322) and the three-way valve (323).

[0016] In a possible design, the aeration system (321) further includes: a compressed inert gas bottle (3216), an inert gas control valve (3217), an aeration plate (3218), and an air outlet (3219), wherein the aeration plate (3218) is arranged at the bottom of the aerator (3211), and the hollow fiber membrane (3214) is above the aeration plate (3218); wherein the compressed inert gas bottle (3216) transports the inert gas to the aeration plate (3218) through the inert gas control valve (3217); the aeration plate (3218) converts the inert gas into a plurality of gas columns to clean the hollow fiber membrane (3214), wherein the inert gas is filled into the interior of the aerator (3211); and the aerator (3211) discharges the inert gas through the air outlet (3219).

[0017] In a possible design, the water inlet system (10) comprises: a water inlet tank (11) and a water inlet pump (12); the water inlet tank (11) is used to receive the nitrogen-containing wastewater and pump the nitrogen-containing wastewater into the biofilm reaction system (30) through the water inlet pump (12).

[0018] In a possible design, the gas supply system (20) comprises: a compressed methane gas cylinder (21) and a methane control valve (22); the compressed methane gas cylinder (21) transports the methane gas to the biofilm reaction system (30) through the methane control valve (22).

[0019] In a second aspect, the present application provides a method for denitrification of nitrogen-containing wastewater, which is applied to the denitrification system for nitrogen-containing wastewater as described in the first aspect, comprising:

[0020] The water inlet system is used to receive nitrogen-containing sewage and pump the nitrogen-containing sewage into the biofilm reaction system;

[0021] The biofilm reaction system cultured the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-feeding culture materials to obtain the cultured anaerobic ammonium oxidizing bacteria and the cultured denitrifying anaerobic methane oxidizing microorganisms; converted the nitrogen-containing sewage into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; and stirred and merged the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates;

[0022] A gas supply system for delivering the methane gas to the biofilm reaction system;

[0023] The biofilm reaction system converts the methane gas into fine methane bubbles; the fine methane bubbles are melted into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane is generated based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; nitrogen gas and nitrogen-free sewage are generated based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and the nitrogen-free sewage is discharged into the outlet tank;

[0024] The water outlet tank discharges the nitrogen-free sewage to a preset site.

[0025] In a possible design, the biofilm reaction system includes: a biofilm reaction device and an internal circulation system; the method includes: the biofilm reaction device, culturing the anaerobic ammonia oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-adding culture to obtain the cultured anaerobic ammonia oxidizing bacteria and the cultured denitrifying anaerobic methane oxidizing microorganisms; converting the nitrogen-containing sewage into nitrogen gas and nitrate solution according to the cultured anaerobic ammonia oxidizing bacteria; stirring and fusing the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; discharging the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates into the internal circulation system; the internal circulation system receives the gas supply system The methane gas is transported; the methane gas is converted into fine methane bubbles; the fine methane bubbles are melted into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane is pumped into the biofilm reaction device; the biofilm reaction device generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; nitrogen gas and nitrogen-free sewage are generated based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; the nitrogen-free sewage is discharged into the outlet tank.

[0026] The denitrification treatment system and method for nitrogen-containing wastewater provided in the present application converts nitrogen-containing wastewater into nitrogen gas and nitrogen-free wastewater through the collaboration between the water inlet system, the air supply system and the biofilm reaction system, and discharges the nitrogen-containing wastewater from the outlet tank without the participation of organic carbon, thereby improving the denitrification treatment efficiency of the nitrogen-containing wastewater and reducing the denitrification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 Schematic diagram of the structure of the denitrification treatment system for nitrogen-containing wastewater provided in the embodiment of the present application Figure 1 ;

[0029] Figure 2 Schematic diagram of the structure of the denitrification treatment system for nitrogen-containing wastewater provided in the embodiment of the present application Figure 2 ;

[0030] Figure 3 Schematic diagram of the process of denitrification treatment method for nitrogen-containing wastewater provided in the embodiment of the present application Figure 1 ;

[0031] Figure 4 Schematic diagram of the process of denitrification treatment method for nitrogen-containing wastewater provided in the embodiment of the present application Figure 2 . DETAILED DESCRIPTION

[0032] 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.

[0033] Nitrogen-containing wastewater refers to wastewater containing nitrogen compounds, mainly including ammonia nitrogen and organic nitrogen. Nitrogen-containing wastewater mainly comes from domestic sewage, agricultural drainage and industrial wastewater. Nitrogen-containing wastewater has caused serious pollution and damage to the environment and ecosystem, such as polluting water quality, destroying the balance of the ecological environment and endangering the health of animals and plants. Therefore, how to treat the nitrogen-containing wastewater generated daily is particularly important. In the prior art, the traditional denitrification treatment of nitrogen-containing wastewater is mainly to oxidize the nitrogen-containing wastewater into nitrate wastewater through the nitrification-denitrification process, and then use organic carbon as an electron donor to reduce the nitrate wastewater to nitrogen gas and nitrogen-free wastewater. However, the nitrification-denitrification process in the prior art requires a large amount of organic carbon to participate in the denitrification process, resulting in a low denitrification efficiency of nitrogen-containing wastewater and increased denitrification costs.

[0034] In order to solve the above-mentioned technical problems, the embodiments of the present application propose the following technical concept: Taking into account the low denitrification treatment efficiency of nitrogen-containing wastewater in the prior art, the inventors construct a denitrification treatment system for nitrogen-containing wastewater based on an inlet system, an air supply system, a biofilm reaction system and an outlet tank. The denitrification treatment system for nitrogen-containing wastewater is used to convert nitrogen-containing wastewater into nitrogen gas and nitrogen-free wastewater, thereby improving the denitrification treatment efficiency of nitrogen-containing wastewater and reducing the denitrification cost.

[0035] Figure 1 Schematic diagram of the structure of the denitrification treatment system for nitrogen-containing wastewater provided in the embodiment of the present application Figure 1 .

[0036] like Figure 1 As shown, the denitrification treatment system for nitrogen-containing wastewater includes: an inlet system 10, an air supply system 20, a biofilm reaction system 30 and a water outlet tank 40, wherein the biofilm reaction system 30 contains denitrifying anaerobic methane oxidizing microorganisms and anaerobic ammonia oxidizing bacteria, and the air supply system 20 contains methane gas.

[0037] The water inlet system 10 is used to receive nitrogen-containing wastewater and pump the nitrogen-containing wastewater into the biofilm reaction system 30 .

[0038] In this embodiment, the nitrogen-containing wastewater contains nitrates and ammonium salts.

[0039] In addition, the concentrations of nitrate and ammonium in the reactor should be maintained in the range of 0-200 mgN / L to provide sufficient substrate for the growth of denitrifying anaerobic methane oxidizing microorganisms.

[0040] In addition, the nitrate in the nitrogen-containing wastewater in the inlet system 10 can be gradually replaced with nitrite, and finally only nitrite and ammonium salt are contained. The specific steps include a to c:

[0041] Step a: manually adding nitrate and ammonium salt into the biofilm reaction system 30, and not starting the water inlet system 10.

[0042] Specifically, nitrate and ammonium salt concentrates are first added directly into the reactor by manual injection to maintain their concentrations in the range of 0-200 mgN / L, and the water inlet system 10 is not started to cultivate anaerobic ammonia oxidizing bacteria and denitrifying anaerobic methane oxidizing microorganisms to form a biofilm and prevent the loss of anaerobic ammonia oxidizing bacteria and denitrifying anaerobic methane oxidizing microorganisms.

[0043] Step b: Start the water inlet system 10 to pump nitrogen-containing wastewater into the biofilm reaction system 30 for denitrification treatment.

[0044] Step c: gradually replacing the nitrate in the nitrogen-containing wastewater in the inlet system 10 with nitrite to promote the coordinated growth of anaerobic ammonia-oxidizing bacteria and denitrifying anaerobic methane-oxidizing microorganisms.

[0045] The biofilm reaction system 30 cultivates anaerobic ammonium oxidizing bacteria and denitrifying anaerobic methane oxidizing microorganisms by pre-adding culture materials to obtain cultured anaerobic ammonium oxidizing bacteria and cultured denitrifying anaerobic methane oxidizing microorganisms; converts nitrogen-containing wastewater into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; and stirs and fuses the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates.

[0046] In this embodiment, the pre-release culture may be a concentrated solution of ammonium salts and nitrates, an enrichment culture, a suitable culture medium or other culture.

[0047] Exemplarily, the ammonium and nitrate concentrates are supplemented by manual addition.

[0048] The gas supply system 20 delivers methane gas to the biofilm reaction system 30 .

[0049] The biofilm reaction system 30 converts methane gas into fine methane bubbles; the fine methane bubbles are melted into a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane is generated from the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; nitrogen gas and nitrogen-free sewage are generated from the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and the nitrogen-free sewage is discharged into the outlet tank 40.

[0050] In this embodiment, the denitrifying anaerobic methane oxidizing microorganisms include denitrifying anaerobic methane oxidizing archaea and denitrifying anaerobic methane oxidizing bacteria.

[0051] Among them, denitrifying anaerobic methane-oxidizing archaea can reduce nitrate to nitrite through methane; denitrifying anaerobic methane-oxidizing bacteria can reduce nitrite to nitrogen gas.

[0052] Specifically, the biofilm reaction system 30 converts methane gas into fine methane bubbles; integrates the fine methane bubbles into a mixed solution containing denitrifying anaerobic methane oxidizing archaea, denitrifying anaerobic methane oxidizing bacteria and nitrate to generate a mixed solution containing denitrifying anaerobic methane oxidizing archaea, denitrifying anaerobic methane oxidizing bacteria and nitrate with dissolved methane; generates a mixed solution containing denitrifying anaerobic methane oxidizing bacteria and nitrite with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing archaea, denitrifying anaerobic methane oxidizing bacteria and nitrate with dissolved methane; generates nitrogen gas and nitrogen-free sewage based on the mixed solution containing denitrifying anaerobic methane oxidizing bacteria and nitrite with dissolved methane; and discharges the nitrogen-free sewage into the outlet tank 40.

[0053] The water outlet tank 40 discharges the nitrogen-free sewage to a predetermined location.

[0054] Exemplarily, the predetermined site may be a nitrogen-free sewage treatment pond.

[0055] In summary, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment converts nitrogen-containing wastewater into nitrogen gas and nitrogen-free wastewater through the collaboration between the water inlet system, the air supply system and the biofilm reaction system, and discharges the nitrogen-containing wastewater from the outlet tank without the participation of organic carbon, thereby improving the denitrification treatment efficiency of nitrogen-containing wastewater and reducing the denitrification cost.

[0056] In addition, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment directly adds nitrate and ammonium salt concentrates into the reactor by manual injection, and gradually replaces the nitrate in the nitrogen-containing wastewater with nitrite, thereby promoting the initial enrichment of anaerobic ammonia-oxidizing bacteria and denitrifying anaerobic methane-oxidizing microorganisms, thereby improving the denitrification treatment efficiency of subsequent nitrogen-containing wastewater.

[0057] In addition, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment uses nitrate and ammonium salt in the nitrogen-containing wastewater as nitrogen sources to start the denitrification treatment system for nitrogen-containing wastewater, thereby ensuring the growth of denitrifying anaerobic methane oxidizing microorganisms. After the denitrification rate reaches a certain level, the nitrate is gradually replaced by nitrite to promote the further growth of anaerobic ammonia oxidizing microorganisms, thereby improving the denitrification rate while ensuring the denitrification efficiency.

[0058] Figure 2 Schematic diagram of the structure of the denitrification treatment system for nitrogen-containing wastewater 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 biofilm reaction system 30 includes: a biofilm reaction device 31 and an internal circulation system 32 .

[0059] Among them, the biofilm reaction device 31 cultivates anaerobic ammonium oxidizing bacteria and denitrifying anaerobic methane oxidizing microorganisms by pre-adding culture materials to obtain cultured anaerobic ammonium oxidizing bacteria and cultured denitrifying anaerobic methane oxidizing microorganisms; converts nitrogen-containing wastewater into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; stirs and fuses the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; and discharges the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates into the internal circulation system 32.

[0060] The internal circulation system 32 receives the methane gas delivered by the gas supply system 20; converts the methane gas into fine methane bubbles; integrates the fine methane bubbles into a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device 31.

[0061] The biofilm reaction device 31 generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane from a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; generates nitrogen gas and nitrogen-free sewage from the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; and discharges the nitrogen-free sewage into the outlet tank 40.

[0062] Continue to refer Figure 2 The biofilm reaction device 31 includes: a bioreactor 311, a first water inlet 312, a high-density polyethylene filler 313, an agitator 314, a pH meter 315, an internal circulation water outlet 316 and a first water outlet 317, wherein the agitator 314 and the pH meter 315 are arranged inside the bioreactor 311.

[0063] The bioreactor 311 receives nitrogen-containing wastewater pumped into the water inlet system 10 through the first water inlet 312; and cultivates anaerobic ammonia oxidizing bacteria and denitrifying anaerobic methane oxidizing microorganisms by pre-adding culture to obtain cultured anaerobic ammonia oxidizing bacteria and cultured denitrifying anaerobic methane oxidizing microorganisms, wherein the anaerobic ammonia oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms are cultured on a high-density polyethylene filler 313; and converts the nitrogen-containing wastewater into nitrogen gas and nitrate solution according to the cultured anaerobic ammonia oxidizing bacteria.

[0064] In this embodiment, the high-density polyethylene filler 313 can be integrated into the sewage and be in a fluidized state. The high-density polyethylene filler 313 has a large specific surface area and is easy to form biofilm, thereby providing a good environment for the growth of bacteria.

[0065] The agitator 314 agitates and fuses the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing the denitrifying anaerobic methane oxidizing microorganisms and nitrate.

[0066] In this embodiment, the stirrer 314 is also used to stir the high-density polyethylene filler 313 .

[0067] pH meter 315, to measure the pH value of the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrate.

[0068] In this embodiment, the pH value ranges from 7.0 to 7.5 to ensure a comfortable bacterial growth environment.

[0069] In addition, the pH meter 315 is also used to ensure that the pH value in the bioreactor 311 is stable.

[0070] The bioreactor 311 discharges the mixed liquid containing denitrifying anaerobic methane oxidizing microorganisms and nitrate into the internal circulation system 32 through the internal circulation water outlet 316 .

[0071] The internal circulation system 32 receives the methane gas delivered by the gas supply system 20; converts the methane gas into fine methane bubbles; integrates the fine methane bubbles into a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the bioreactor 311.

[0072] The bioreactor 311 generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane based on a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; generates nitrogen gas and nitrogen-free sewage based on a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; and discharges the nitrogen-free sewage into the water outlet tank 40 through the first water outlet 317.

[0073] Continue to refer Figure 2 The internal circulation system 32 includes an aeration system 321 , an internal circulation pump 322 and a three-way valve 323 .

[0074] The aeration system 321 receives the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates discharged from the biofilm reaction device 31; receives the methane gas delivered by the gas supply system 20; converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device 31 through the internal circulation pump 322 and the three-way valve 323.

[0075] Continue to refer Figure 2 The aeration system 321 includes: an aerator 3211 , a second water inlet 3212 , an air inlet 3213 , a hollow fiber membrane 3214 and a second water outlet 3215 , wherein the hollow fiber membrane 3214 is disposed inside the aerator 3211 .

[0076] The aerator 3211 receives the mixed liquid containing denitrifying anaerobic methane oxidizing microorganisms and nitrate discharged from the biofilm reaction device 31 through the second water inlet 3212; and

[0077] The hollow fiber membrane 3214 receives the methane gas delivered by the gas supply system 20 through the gas inlet 3213 , converts the methane gas into fine methane bubbles, and fills the fine methane bubbles into the aerator 3211 .

[0078] The aerator 3211 blends fine methane bubbles into a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane is pumped into the biofilm reaction device 31 through the second water outlet 3215, the internal circulation pump 322 and the three-way valve 323.

[0079] Continue to refer Figure 2 The aeration system 321 also includes: a compressed inert gas bottle 3216, an inert gas control valve 3217, an aeration plate 3218 and an outlet 3219, wherein the aeration plate 3218 is arranged at the bottom of the aerator 3211, and the hollow fiber membrane 3214 is above the aeration plate 3218.

[0080] Among them, the inert gas cylinder 3216 is compressed and the inert gas is transported to the aeration plate 3218 through the inert gas control valve 3217.

[0081] The aeration plate 3218 converts the inert gas into a plurality of gas columns to clean the hollow fiber membrane 3214 , wherein the inert gas is filled into the interior of the aerator 3211 .

[0082] In this embodiment, since the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrate passes through the hollow fiber membrane 3214, a biofilm of denitrifying anaerobic methane oxidizing microorganisms is likely to be generated on the hollow fiber membrane 3214 over time, thereby affecting the normal use of the hollow fiber membrane 3214.

[0083] The purpose of cleaning the hollow fiber membrane 3214 is to remove the biofilm on the hollow fiber membrane 3214 .

[0084] In addition, the internal circulation pump 322 and the gas supply system 20 need to be shut down to stop the circulation and methane supply.

[0085] The aerator 3211 discharges the inert gas through the gas outlet 3219 .

[0086] In addition, after the hollow fiber membrane 3214 is cleaned, the inert gas control valve 3217 and the gas outlet 3219 are closed, and the internal circulation pump 322 and the gas supply system 20 are turned on.

[0087] Continue to refer Figure 2 The water inlet system 10 comprises a water inlet tank 11 and a water inlet pump 12 .

[0088] The water inlet tank 11 is used to receive the nitrogen-containing wastewater and pump the nitrogen-containing wastewater into the biofilm reaction system 30 through the water inlet pump 12 .

[0089] Continue to refer Figure 2 The gas supply system 20 includes: a compressed methane gas cylinder 21 and a methane control valve 22.

[0090] The methane gas cylinder 21 is compressed and transported to the biofilm reaction system 30 through the methane control valve 22 .

[0091] In summary, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment converts nitrogen-containing wastewater into nitrogen gas and nitrogen-free wastewater through the collaboration between the water inlet system, the air supply system and the specific components in the biofilm reaction system, and discharges the nitrogen-free wastewater from the outlet tank, thereby improving the denitrification treatment efficiency of nitrogen-containing wastewater.

[0092] In addition, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment provides methane to the biofilm reaction device through the hollow fiber membrane in the aeration system, which can directly dissolve the gas in a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates, greatly improving the utilization efficiency of methane gas and reducing the emission of greenhouse gas methane to improve the safety of the process.

[0093] In addition, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment can avoid damage to the hollow fiber membrane caused by operations such as stirring and collision in the biofilm reaction device by separately setting the internal circulation system and the biofilm reaction device, thereby improving the performance stability of the hollow fiber membrane and extending its service life.

[0094] In addition, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment cleans the hollow fiber membrane through a compressed inert gas cylinder, an inert gas control valve, an aeration plate and an air outlet to remove bacteria attached to the hollow fiber membrane, so that the hollow fiber membrane can stably transport gas and extend its service life.

[0095] In addition, the denitrification treatment system for nitrogen-containing wastewater provided in this embodiment, by filling the biofilm reactor with high-density polyethylene filler, has a large specific surface area and efficient biofilm adhesion, which can provide a good environment for the growth of denitrifying anaerobic methane oxidizing microorganisms and anaerobic ammonia oxidizing bacteria and increase the enrichment rate of bacteria.

[0096] Figure 3 Schematic diagram of the process of denitrification treatment method for nitrogen-containing wastewater provided in the embodiment of the present application Figure 1 The execution entity of this embodiment can be Figure 1 The denitrification treatment system for nitrogen-containing wastewater in the embodiment shown is not particularly limited in this embodiment. Figure 3 As shown, the method includes:

[0097] S301: A water inlet system, used to receive nitrogen-containing wastewater and pump the nitrogen-containing wastewater into the biofilm reaction system.

[0098] S302: A biofilm reaction system, wherein anaerobic ammonium oxidizing bacteria and denitrifying anaerobic methane oxidizing microorganisms are cultured by pre-adding culture materials to obtain cultured anaerobic ammonium oxidizing bacteria and cultured denitrifying anaerobic methane oxidizing microorganisms; nitrogen-containing wastewater is converted into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; and the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution are stirred and merged to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates.

[0099] S303: Gas supply system, transporting methane gas to the biofilm reaction system.

[0100] S304: Biofilm reaction system, converting methane gas into fine methane bubbles; integrating fine methane bubbles into a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generating a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane from the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generating nitrogen gas and nitrogen-free sewage from the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and discharging the nitrogen-free sewage into an outlet tank.

[0101] S305: The water outlet tank discharges the nitrogen-free wastewater to a preset site.

[0102] In summary, the denitrification treatment method for nitrogen-containing wastewater provided in this embodiment is as follows: the nitrogen-containing wastewater is pumped into the biofilm reaction system through the water inlet system; the biofilm reaction system converts the nitrogen-containing wastewater into nitrogen gas and nitrate solution according to the cultured anaerobic ammonia-oxidizing bacteria; the denitrifying anaerobic methane-oxidizing microorganisms and the nitrate solution are stirred and merged to obtain a mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrates; the gas supply system transports methane gas to the biofilm reaction system; the biofilm reaction system integrates methane gas into the mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrates with dissolved methane; nitrogen gas and nitrogen-free wastewater are generated according to the mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrates with dissolved methane; the nitrogen-free wastewater is discharged into the outlet tank; the outlet tank discharges the nitrogen-free wastewater to a preset site, thereby improving the denitrification treatment efficiency of the nitrogen-containing wastewater.

[0103] Figure 4 Schematic diagram of the process of denitrification treatment method for nitrogen-containing wastewater provided in the embodiment of the present application Figure 2 The execution entity of this embodiment can be Figure 2 The denitrification treatment system for nitrogen-containing wastewater in the embodiment shown is not particularly limited in this embodiment. The biofilm reaction system includes a biofilm reaction device and an internal circulation system, such as Figure 4 As shown, the method corresponding to the biofilm reaction system is described in detail, and the method includes:

[0104] S401: A biofilm reaction device, which cultivates anaerobic ammonium oxidizing bacteria and denitrifying anaerobic methane oxidizing microorganisms by pre-adding culture materials to obtain cultured anaerobic ammonium oxidizing bacteria and cultured denitrifying anaerobic methane oxidizing microorganisms; converts nitrogen-containing wastewater into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; stirs and fuses the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; and discharges the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates into the internal circulation system.

[0105] S402: an internal circulation system, receiving methane gas delivered by the gas supply system; converting the methane gas into fine methane bubbles; blending the fine methane bubbles into a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; pumping the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into a biofilm reaction device.

[0106] S403: A biofilm reaction device generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane from a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; generates nitrogen gas and nitrogen-free sewage from a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; and discharges the nitrogen-free sewage into an outlet tank.

[0107] In summary, the denitrification treatment method for nitrogen-containing wastewater provided in this embodiment converts nitrogen-containing wastewater into nitrogen gas and nitrate solution by cultivating anaerobic ammonia-oxidizing bacteria; stirs and fuses denitrifying anaerobic methane-oxidizing microorganisms and nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrate; an internal circulation system receives methane gas delivered by a gas supply system; methane gas is blended into a mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrate to generate a mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrate with dissolved methane; a biofilm reaction device generates nitrogen gas and nitrogen-free wastewater according to the mixed solution containing denitrifying anaerobic methane-oxidizing microorganisms and nitrate with dissolved methane; and the nitrogen-free wastewater is discharged into an outlet tank, thereby improving the denitrification treatment efficiency of nitrogen-containing wastewater.

[0108] 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 nitrogen-containing wastewater, characterized in that: include: A water inlet system (10), an air supply system (20), a biofilm reaction system (30), and a water outlet tank (40), wherein the biofilm reaction system (30) contains denitrifying anaerobic methane oxidizing microorganisms and anaerobic ammonia oxidizing bacteria, and the air supply system (20) contains methane gas; Wherein, the water inlet system (10) is used to receive nitrogen-containing wastewater and pump the nitrogen-containing wastewater into the biofilm reaction system (30); The biofilm reaction system (30) is configured to culture the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-adding a culture material to obtain the cultured anaerobic ammonium oxidizing bacteria and the cultured denitrifying anaerobic methane oxidizing microorganisms; convert the nitrogen-containing sewage into nitrogen gas and a nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; and stir and fuse the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing the denitrifying anaerobic methane oxidizing microorganisms and nitrates; A gas supply system (20) for delivering the methane gas to the biofilm reaction system (30); The biofilm reaction system (30) converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; generates nitrogen gas and nitrogen-free sewage based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and discharges the nitrogen-free sewage into the outlet tank (40); The water outlet box (40) discharges the nitrogen-free sewage to a preset site.

2. The denitrification treatment system for nitrogen-containing wastewater according to claim 1, characterized in that: The biofilm reaction system (30) comprises: a biofilm reaction device (31) and an internal circulation system (32); The biofilm reaction device (31) is configured to culture the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-feeding a culture medium to obtain the cultured anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms; convert the nitrogen-containing wastewater into nitrogen gas and a nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; stir and fuse the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; and discharge the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates into the internal circulation system (32); The internal circulation system (32) receives the methane gas delivered by the gas supply system (20); converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device (31); The biofilm reaction device (31) generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; generates nitrogen gas and nitrogen-free wastewater based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and discharges the nitrogen-free wastewater into the water outlet tank (40).

3. The denitrification treatment system for nitrogen-containing wastewater according to claim 2, characterized in that: The biofilm reaction device (31) comprises: a bioreactor (311), a first water inlet (312), a high-density polyethylene filler (313), an agitator (314), a pH meter (315), an internal circulation water outlet (316) and a first water outlet (317), wherein the agitator (314) and the pH meter (315) are arranged inside the bioreactor (311); The bioreactor (311) receives the nitrogen-containing wastewater pumped into the water inlet system (10) through the first water inlet (312); and cultivates the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-adding culture to obtain the cultured anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms, wherein the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms are cultured on the high-density polyethylene filler (313); and converts the nitrogen-containing wastewater into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; The stirrer (314) stirs and fuses the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing the denitrifying anaerobic methane oxidizing microorganisms and nitrate; The pH meter (315) measures the pH value of the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; The bioreactor (311) discharges the mixed liquid containing denitrifying anaerobic methane oxidizing microorganisms and nitrate into the internal circulation system (32) through the internal circulation water outlet (316); The internal circulation system (32) receives the methane gas delivered by the gas supply system (20); converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the bioreactor (311); The bioreactor (311) generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; generates nitrogen gas and nitrogen-free sewage based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and discharges the nitrogen-free sewage into the water outlet tank (40) through the first water outlet (317).

4. The denitrification treatment system for nitrogen-containing wastewater according to claim 2, characterized in that: The internal circulation system (32) comprises: an aeration system (321), an internal circulation pump (322) and a three-way valve (323); The aeration system (321) receives the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates discharged from the biofilm reaction device (31); receives the methane gas transported by the gas supply system (20); converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device (31) through the internal circulation pump (322) and the three-way valve (323).

5. The denitrification treatment system for nitrogen-containing wastewater according to claim 4, characterized in that: The aeration system (321) comprises: an aerator (3211), a second water inlet (3212), an air inlet (3213), a hollow fiber membrane (3214), and a second water outlet (3215), wherein the hollow fiber membrane (3214) is arranged inside the aerator (3211); The aerator (3211) receives the mixed liquid containing denitrifying anaerobic methane oxidizing microorganisms and nitrates discharged from the biofilm reaction device (31) through the second water inlet (3212); and The hollow fiber membrane (3214) receives the methane gas delivered by the gas supply system (20) through the gas inlet (3213); converts the methane gas into fine methane bubbles; and fills the fine methane bubbles into the aerator (3211); The aerator (3211) blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane is pumped into the biofilm reaction device (31) through the second water outlet (3215), the internal circulation pump (322) and the three-way valve (323).

6. The denitrification treatment system for nitrogen-containing wastewater according to claim 5, characterized in that: The aeration system (321) further comprises: a compressed inert gas bottle (3216), an inert gas control valve (3217), an aeration plate (3218), and a gas outlet (3219), wherein the aeration plate (3218) is arranged at the bottom of the aerator (3211), and the hollow fiber membrane (3214) is above the aeration plate (3218); Wherein, the compressed inert gas cylinder (3216) delivers the inert gas to the aeration plate (3218) through the inert gas control valve (3217); The aeration plate (3218) converts the inert gas into a plurality of gas columns to clean the hollow fiber membrane (3214), wherein the inert gas is filled into the interior of the aerator (3211); The aerator (3211) discharges the inert gas through the gas outlet (3219).

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

8. The denitrification treatment system for nitrogen-containing wastewater according to any one of claims 1 to 7, characterized in that: The gas supply system (20) comprises: a compressed methane gas cylinder (21) and a methane control valve (22); The compressed methane gas cylinder (21) transports the methane gas to the biofilm reaction system (30) through the methane control valve (22).

9. A method for denitrification of nitrogen-containing wastewater, characterized in that: The denitrification treatment system for nitrogen-containing wastewater as claimed in claim 1 comprises: The water inlet system is used to receive nitrogen-containing sewage and pump the nitrogen-containing sewage into the biofilm reaction system; The biofilm reaction system cultured the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-feeding culture materials to obtain the cultured anaerobic ammonium oxidizing bacteria and the cultured denitrifying anaerobic methane oxidizing microorganisms; converted the nitrogen-containing sewage into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; and stirred and merged the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; A gas supply system for delivering the methane gas to the biofilm reaction system; The biofilm reaction system converts the methane gas into fine methane bubbles; the fine methane bubbles are melted into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane is generated based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; nitrogen gas and nitrogen-free sewage are generated based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrites with dissolved methane; and the nitrogen-free sewage is discharged into the outlet tank; The water outlet tank discharges the nitrogen-free sewage to a preset site.

10. The method according to claim 9, characterized in that The biofilm reaction system comprises: a biofilm reaction device and an internal circulation system; The method comprises: The biofilm reaction device is configured to culture the anaerobic ammonium oxidizing bacteria and the denitrifying anaerobic methane oxidizing microorganisms by pre-feeding a culture to obtain the cultured anaerobic ammonium oxidizing bacteria and the cultured denitrifying anaerobic methane oxidizing microorganisms; convert the nitrogen-containing sewage into nitrogen gas and nitrate solution according to the cultured anaerobic ammonium oxidizing bacteria; stir and fuse the denitrifying anaerobic methane oxidizing microorganisms and the nitrate solution to obtain a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates; and discharge the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates into the internal circulation system; The internal circulation system receives the methane gas delivered by the gas supply system; converts the methane gas into fine methane bubbles; blends the fine methane bubbles into the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates to generate a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane; and pumps the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrates with dissolved methane into the biofilm reaction device; The biofilm reaction device generates a mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; generates nitrogen and nitrogen-free sewage based on the mixed solution containing denitrifying anaerobic methane oxidizing microorganisms and nitrite with dissolved methane; and discharges the nitrogen-free sewage into the water outlet tank.

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