A reactor for denitrification using greenhouse gas methane

Abstract

The utility model discloses a reactor for denitrification using greenhouse gas methane, including a reactor body, a plurality of membrane components are arranged inside the reactor body, a water distributor is arranged at the bottom of the reactor body, an online monitor for nitrate nitrogen, an online monitor for ammonia nitrogen and an online monitor for nitrite nitrogen are arranged on the reactor body, a water inlet pump is arranged at the position where the inlet of the reactor body is connected to the water distributor, the membrane component is connected to the methane online monitor and a compressor fan, the water inlet pump is connected to a water inlet pipe, a methane pipeline is connected between the membrane component and the compressor fan, an electric valve is arranged on the methane pipeline, and a water outlet pipe is connected to the outlet end of the reactor body. The reactor for denitrification using greenhouse gas methane described in the utility model adopts a dense membrane for bubble-free aeration to diffuse methane into wastewater, thereby improving the solubility and mass transfer efficiency of methane, and the total nitrogen removal efficiency is increased to more than 98%.

Description

Technical Field

[0001] The utility model relates to the field of methane denitrification treatment, in particular to a reactor which utilizes greenhouse gas methane for denitrification. Background Art

[0002] The reactor that uses greenhouse gas methane for denitrification is a supporting equipment for methane denitrification treatment. The total nitrogen in sewage (wastewater) includes Kjeldahl nitrogen, ammonia nitrogen, nitrate nitrogen and nitrite nitrogen, which play a key role in the eutrophication of water bodies. Therefore, the total nitrogen in sewage (wastewater) is an important task to protect the water environment.

[0003] Conventional biological denitrification microorganisms are autotrophic and heterotrophic. In the context of carbon peak and carbon neutrality, the use of autotrophic microbial denitrification methods that do not require the addition of external carbon sources is a trend.

[0004] Autotrophic denitrification microorganisms include anaerobic ammonium oxidation bacteria and nitrite-dependent anaerobic methane oxidation bacteria (n-DAMO bacteria). With the continuous development of science and technology, people have higher and higher requirements for the manufacturing process of reactors that use greenhouse gas methane for denitrification.

[0005] The existing methane denitrification reactor has certain drawbacks when in use. A certain amount of nitrate will be generated after the reaction is completed. Therefore, under ideal conditions, when the reaction is complete and the ratio of ammonia nitrogen to nitrite nitrogen is exactly 1:1.32, the total nitrogen removal rate is only about 90%; methane is a gas that is difficult to dissolve in water. Its solubility in wastewater is very low, and mass transfer is greatly restricted, making it difficult to be utilized by microorganisms. Directly passing methane into wastewater has low utilization rate and total nitrogen removal rate. For this reason, we propose a reactor that uses greenhouse gas methane for denitrification. Utility Model Content

[0006] Technical problem solved: In view of the shortcomings of the prior art, the utility model provides a reactor for denitrification using greenhouse gas methane, which uses a dense membrane for bubble-free aeration to diffuse methane into wastewater, thereby improving the solubility and mass transfer efficiency of methane, and the total nitrogen removal efficiency is increased to more than 98%, which can effectively solve the problems in the background technology.

[0007] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a reactor for denitrification using greenhouse gas methane, comprising a reactor body, a plurality of membrane components are arranged inside the reactor body, a water distributor is arranged at the bottom of the reactor body, an online nitrate nitrogen monitor, an online ammonia nitrogen monitor and an online nitrite nitrogen monitor are arranged on the reactor body, a water inlet pump is arranged at the position where the inlet of the reactor body is connected to the water distributor, and the membrane components are connected to a methane online monitor and a compression fan.

[0008] Preferably, the water inlet pump is connected to a water inlet pipe, a methane pipeline is connected between the membrane assembly and the compressor fan, an electric valve is provided on the methane pipeline, and the outlet end of the reactor body is connected to a water outlet pipe.

[0009] Preferably, the membrane assembly includes an air inlet pipe, a membrane element and a membrane support, the air inlet pipe is arranged on the membrane support, the membrane element is arranged on the air inlet pipe, the membrane element includes membrane filaments and biofilms, and the biofilms are located on the outer walls of the membrane filaments.

[0010] Preferably, the output end of the water inlet pipe is connected to the input end of the water inlet pump, the membrane assembly is connected to the compressor fan through a methane pipeline and controlled by an electric valve, and the output end of the reactor body is connected to the input end of the water outlet pipe.

[0011] Preferably, the air inlet pipe is fixed to the membrane support, and the membrane element is positioned and attached to the air inlet pipe.

[0012] Preferably, the nitrate nitrogen online monitor, the ammonia nitrogen online monitor and the nitrite nitrogen online monitor monitor the internal state of the reactor body, and the methane online monitor monitors the internal state of the membrane assembly.

[0013] Beneficial effects: Compared with the prior art, the utility model provides a reactor for denitrification using greenhouse gas methane, which has the following beneficial effects: the reactor for denitrification using greenhouse gas methane adopts a dense membrane for bubble-free aeration to diffuse methane into wastewater, thereby improving the solubility and mass transfer efficiency of methane, and the total nitrogen removal efficiency is increased to more than 98%. The entire reactor for denitrification using greenhouse gas methane has a simple structure, is easy to operate, and has better effects than traditional methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the overall structure of a reactor for denitrification using greenhouse gas methane.

[0015] Figure 2 It is a schematic structural diagram of a top view of a membrane assembly in a reactor for denitrification using greenhouse gas methane according to the utility model.

[0016] Figure 3 It is a structural schematic diagram of a side view of a membrane component in a reactor for denitrification using greenhouse gas methane according to the utility model.

[0017] Figure 4 It is a structural schematic diagram of the other side view of a membrane component in a reactor for denitrification using greenhouse gas methane according to the utility model.

[0018] Figure 5 The utility model is a schematic diagram of the structure of a membrane element in a reactor for denitrification using greenhouse gas methane.

[0019] In the figure: 1. water inlet pump; 2. water distributor; 3. membrane assembly; 301. air inlet pipe; 302. membrane element; 3021. membrane filament; 3022. biofilm; 303. membrane support; 4. compressor fan; 5. electric valve; 6. nitrate nitrogen online monitor; 7. ammonia nitrogen online monitor; 8. nitrite nitrogen online monitor; 9. methane online monitor; 10. water inlet pipe; 11. water outlet pipe; 12. methane pipeline; 13. reactor body. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figure 1-5 As shown, a reactor for denitrification using greenhouse gas methane includes a reactor body 13, a plurality of membrane components 3 are arranged inside the reactor body 13, a water distributor 2 is arranged at the bottom of the reactor body 13, an online nitrate nitrogen monitor 6, an online ammonia nitrogen monitor 7 and an online nitrite nitrogen monitor 8 are arranged on the reactor body 13, a water inlet pump 1 is arranged at the position where the inlet of the reactor body 13 is connected to the water distributor 2, the membrane component 3 is connected to the methane online monitor 9 and the compression fan 4, and a dense membrane is used for bubble-free aeration to diffuse methane into the wastewater, thereby improving the solubility and mass transfer efficiency of methane, and the total nitrogen removal efficiency is increased to more than 98%.

[0024] Furthermore, the water inlet pump 1 is connected to a water inlet pipe 10 , a methane pipeline 12 is connected between the membrane assembly 3 and the compressor fan 4 , an electric valve 5 is provided on the methane pipeline 12 , and a water outlet pipe 11 is connected to the outlet end of the reactor body 13 .

[0025] Furthermore, the membrane assembly 3 includes an air inlet pipe 301 , a membrane element 302 and a membrane support 303 . The air inlet pipe 301 is arranged on the membrane support 303 . The membrane element 302 is arranged on the air inlet pipe 301 . The membrane element 302 includes a membrane filament 3021 and a biofilm 3022 . The biofilm 3022 is located on the outer wall of the membrane filament 3021 .

[0026] Furthermore, the output end of the water inlet pipe 10 is connected to the input end of the water inlet pump 1, the membrane assembly 3 and the compressor fan 4 are connected through the methane pipeline 12 and controlled by the electric valve 5, and the output end of the reactor body 13 is connected to the input end of the water outlet pipe 11.

[0027] Furthermore, the air inlet pipe 301 and the membrane support 303 are fixed, and the membrane element 302 is positioned and attached to the air inlet pipe 301 .

[0028] Furthermore, the nitrate nitrogen online monitor 6 , the ammonia nitrogen online monitor 7 and the nitrite nitrogen online monitor 8 monitor the internal state of the reactor body 13 , and the methane online monitor 9 monitors the internal state of the membrane assembly 3 .

[0029] Working principle: The utility model includes an inlet pump 1, a water distributor 2, a membrane assembly 3, a compression fan 4, an electric valve 5, a nitrate nitrogen online monitor 6, an ammonia nitrogen online monitor 7, a nitrite nitrogen online monitor 8, a methane online monitor 9, an inlet pipe 10, an outlet pipe 11, a methane pipeline 12, and a reactor body 13. A dense membrane is used for bubble-free aeration to diffuse methane into the wastewater, thereby improving the solubility and mass transfer efficiency of methane, and the total nitrogen removal efficiency is increased to more than 98%.

[0030] The incoming water is lifted into the reactor by the water inlet pump 1, and evenly distributed into the reactor by the water distributor 2. The compressor fan 4 delivers methane to the membrane assembly 3, and the methane passes through the membrane filament 3021 of the membrane element 302 through the air inlet pipe 301 and diffuses into the biofilm 3022. Anaerobic ammonia oxidizing bacteria, n-DAMO bacteria and nitrogen-dependent methanogens are attached to the biofilm at the same time, and anaerobic ammonia oxidation reaction, nitrogen-dependent methane anaerobic oxidation reaction and archaea reaction are carried out at the same time, and finally ammonia nitrogen, nitrite nitrogen and nitrate nitrogen are converted into nitrogen gas.

[0031] An online nitrate nitrogen monitor 6, an online ammonia nitrogen monitor 7 and an online nitrite nitrogen monitor 8 are arranged in the reactor. By real-time monitoring the concentrations of nitrate nitrogen, ammonia nitrogen and nitrite nitrogen in the wastewater, the amount of methane required by the microorganisms in the wastewater is comprehensively judged, and the amount of methane is adjusted by the opening degree of the electric valve 5.

[0032] A methane online monitor 9 is arranged on the top of the reactor.

[0033] The water is continuously replenished in the pool and the water is continuously discharged.

[0034] The membrane module uses a breathable membrane for dissolved gas, and the membrane material is a hydrophobic material such as polyvinylidene fluoride (PVDF) or silicone. Dense membrane, microporous membrane and composite membrane are all acceptable.

[0035] The membrane allows methane to diffuse into the water as molecules without the water permeating back to the gas phase. This methane transfer occurs without the formation of bubbles.

[0036] The membrane modules are available in hollow fiber, flat plate or roll format.

[0037] The material of the membrane support is SS304.

[0038] The air supply mode of the membrane module is dead-end type or through-type.

[0039] The reactor is a tower structure with a height of 15m~25m. The MABR membrane assembly is 2.5~3m high and is arranged in 3~5 layers vertically staggered.

[0040] When the membrane components diffuse methane, methane does not need to overcome the hydrostatic head and can be arranged in parallel or in series according to the demand for methane in the water.

[0041] The ammonia nitrogen concentration in the water is too high, which means that the anaerobic ammonium oxidation is not complete and the nitrite nitrogen is insufficient. The amount of methane should be increased to ensure that the anaerobic ammonium oxidation is complete by reducing the nitrate nitrogen to nitrite nitrogen through archaea, thereby reducing the ammonia nitrogen concentration.

[0042] If the nitrate nitrogen content in the water is too high, it means that the n-DAMO reaction is not complete and the methane content is insufficient. The amount of methane should be increased to ensure that the n-DAMO reaction is thorough and reduce the nitrate nitrogen content.

[0043] If the nitrite nitrogen content in the water is too high, it means that the archaea reduce nitrate nitrogen to nitrite nitrogen quickly, or the ammonia nitrogen concentration is too low. You can reduce the supply of methane or increase the ammonia nitrogen concentration in the inlet water.

[0044] Monitor the methane concentration at the top of the reactor in real time. When the methane concentration exceeds a certain value, it should be checked. It may be that the microbial activity is inhibited and methane cannot be metabolized. Stop water intake and take measures to restore microbial activity. Or the total nitrogen content of the incoming water is insufficient and methane is excessive, so increase the total nitrogen content of the incoming water.

[0045] The driving factor for methane dissolution is the methane concentration gradient between the membrane (high) and the biofilm (low). The compression blower needs to provide a pressure of no more than 300mbar.

[0046] The influent can be domestic sewage or industrial wastewater with high nitrogen content, such as landfill leachate, starch wastewater, liquor wastewater, etc.

[0047] The suitable temperature for wastewater in the reactor is a medium temperature environment of 35~39℃.

[0048] After being processed in the reactor, the waste enters the subsequent sedimentation or filtration unit for mud-water separation.

[0049] Depending on the type of influent, the wastewater stays in the equipment for 1 to 3 days, depending on the concentration of ammonia nitrogen and nitrate nitrogen.

[0050] The reactor body is made of anti-corrosion carbon steel and has a height of 15m~20m.

[0051] The removal rates of ammonia nitrogen, nitrate nitrogen and nitrite nitrogen are greater than 99%, and the total nitrogen removal rate is over 98%.

[0052] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A reactor for denitrification using greenhouse gas methane, comprising a reactor body (13), characterized in that: A plurality of membrane assemblies (3) are arranged inside the reactor body (13); a water distributor (2) is arranged at the bottom of the reactor body (13); an online nitrate nitrogen monitor (6), an online ammonia nitrogen monitor (7) and an online nitrite nitrogen monitor (8) are arranged on the reactor body (13); a water inlet pump (1) is arranged at the position where the inlet of the reactor body (13) is connected to the water distributor (2); and the membrane assembly (3) is connected to an online methane monitor (9) and a compression fan (4).

2. A reactor for denitrification using greenhouse gas methane according to claim 1, characterized in that: The water inlet pump (1) is connected to a water inlet pipe (10), a methane pipeline (12) is connected between the membrane assembly (3) and the compressor fan (4), an electric valve (5) is provided on the methane pipeline (12), and the outlet end of the reactor body (13) is connected to a water outlet pipe (11).

3. A reactor for denitrification using greenhouse gas methane according to claim 1, characterized in that: The membrane assembly (3) comprises an air inlet pipe (301), a membrane element (302) and a membrane support (303); the air inlet pipe (301) is arranged on the membrane support (303); the membrane element (302) is arranged on the air inlet pipe (301); the membrane element (302) comprises a membrane filament (3021) and a biofilm (3022); the biofilm (3022) is located on the outer wall of the membrane filament (3021).

4. A reactor for denitrification using greenhouse gas methane according to claim 2, characterized in that: The output end of the water inlet pipe (10) is connected to the input end of the water inlet pump (1), the membrane assembly (3) is connected to the compressor fan (4) via a methane pipeline (12) and is controlled by an electric valve (5), and the output end of the reactor body (13) is connected to the input end of the water outlet pipe (11).

5. A reactor for denitrification using greenhouse gas methane according to claim 3, characterized in that: The air inlet pipe (301) is fixed to the membrane support (303), and the membrane element (302) is positioned and attached to the air inlet pipe (301).

6. A reactor for denitrification using greenhouse gas methane according to claim 1, characterized in that: The nitrate nitrogen online monitor (6), the ammonia nitrogen online monitor (7) and the nitrite nitrogen online monitor (8) monitor the internal state of the reactor body (13), and the methane online monitor (9) monitors the internal state of the membrane module (3).

Images