A denitrification process and system for high-concentration nitrogen-containing wastewater

Abstract

This invention discloses a denitrification system for high-concentration nitrogen-containing wastewater. The denitrification system includes a loading tank, an aeration pump, a reactor, and a real-time monitoring and control device. The loading tank is connected to the reactor and controlled by valves. The aeration pump controls the switching between nitrification and denitrification reactions. The reactor is filled with packing material adsorbing mycobacteria with preservation number CCTCC M20241347. The real-time monitoring and control device is used to detect the ammonia nitrogen concentration, nitrite concentration, and pH value of the reaction liquid in the reactor, and based on the detected ammonia nitrogen concentration, nitrite concentration, and pH value, controls the switching of the aeration pump to achieve the switching between nitrification and denitrification reactions. It also controls the opening and closing of the valves to control the addition of organic carbon sources, acids, or alkalis from the loading tank to the reactor. This invention also discloses a denitrification process for high-concentration nitrogen-containing wastewater, which can achieve efficient denitrification of high-concentration nitrogen-containing wastewater.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and in particular to a denitrification process and system for high-concentration nitrogen-containing wastewater. Background Technology

[0002] The treatment of high-concentration nitrogenous wastewater, exemplified by landfill leachate, has always been a key focus and challenge in the wastewater treatment field. High-concentration nitrogenous wastewater is characterized by its complex composition, high ammonia nitrogen content (typically above 2000 PPM), and relatively low content of easily degradable organic matter (C / N ratio generally less than 2), making biological treatment difficult and costly. Currently, the main technologies for treating high-concentration nitrogenous wastewater include membrane treatment and biological denitrification. Membrane treatment is merely physical filtration and does not truly convert the main pollutants in the wastewater, such as ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen, into harmless nitrogen gas that is released back into the atmosphere. To truly achieve this, biological denitrification is essential.

[0003] Currently, the most commonly used biological nitrogen removal processes mainly involve two steps: nitrification and denitrification. First, ammonia nitrogen is converted into nitrite and nitrate nitrogen through nitrification, and then the nitrite and nitrate nitrogen are converted into nitrogen gas through denitrification. Considering that common nitrifying bacteria have low tolerance to high concentrations of ammonia nitrogen, most biological nitrogen removal processes first dilute nitrogen-containing wastewater and recycle the nitrified liquid for denitrification to reduce the concentration of ammonia nitrogen and COD in the reaction liquid entering the nitrification tank. The nitrogen removal efficiency (i.e., ammonia nitrogen load per unit volume) of current biological nitrogen removal systems is generally below 180 PPM / 24H, and the carbon source consumption is generally above 10 kg per ton of raw water, resulting in low nitrogen removal efficiency and high cost. Summary of the Invention

[0004] To achieve efficient denitrification of high-concentration nitrogen-containing wastewater, this application proposes a denitrification process and system for high-concentration nitrogen-containing wastewater, and adopts the following technical solution:

[0005] In one aspect, this application discloses a denitrification system for high-concentration nitrogen-containing wastewater, the denitrification system comprising a feeding tank, an aeration pump, a reactor, and a real-time monitoring and control device;

[0006] The loading tank is connected to the reactor and is controlled by a valve;

[0007] The aeration pump controls the conversion between nitrification and denitrification reactions;

[0008] The reactor is filled with packing material that adsorbs mycobacteria with preservation number CCTCC M 20241347;

[0009] The real-time detection and control device is used to detect the ammonia nitrogen concentration, nitrite concentration, and pH value of the reaction liquid in the reactor, and based on the detected ammonia nitrogen concentration, nitrite concentration, and pH value of the reaction liquid in the reactor, controls the switching of the aeration pump to realize the conversion between nitrification and denitrification reactions; and controls the switching of the valve to realize the addition control of organic carbon source, acid or alkali in the feeding tank to the reactor.

[0010] In a specific embodiment, during the nitrification reaction stage, the real-time detection and control device compares the ammonia nitrogen concentration of the reaction liquid with a first preset value and the nitrite concentration of the reaction liquid with a second preset value, and issues a command to stop aeration; during the denitrification reaction stage, the real-time detection and control device compares the nitrite concentration of the reaction liquid with a third preset value and the ammonia nitrogen concentration of the reaction liquid with the first preset value, and issues a command to discharge the reaction liquid from the system; during the denitrification reaction stage, the real-time detection and control device calculates the amount of organic carbon source required to complete the denitrification reaction based on the initial nitrite concentration at the start of the denitrification reaction, and issues a command to supply the organic carbon source into the reactor.

[0011] In a specific embodiment, a water pump can also be installed at the reaction liquid outlet of the reactor to discharge the reaction liquid from the system.

[0012] In a specific embodiment, the packing material adsorbing mycobacteria with preservation number CCTCC M 20241347 occupies more than 40% of the reactor volume.

[0013] On the other hand, this application discloses a denitrification process for high-concentration nitrogen-containing wastewater, which operates in the aforementioned high-concentration nitrogen-containing wastewater denitrification system, including:

[0014] Nitrogenous wastewater (ammonia nitrogen concentration of 500-4000 PPM and COD concentration of 500-5000 PPM) is injected into the reactor;

[0015] Alternating between aerated nitrification and anoxic denitrification (using a single reactor mode, i.e., nitrification and denitrification are carried out alternately in the same reactor, with aerated nitrification occurring first);

[0016] During the nitrification reaction, the ammonia nitrogen concentration and nitrite concentration of the reaction liquid in the reactor are detected every certain period of time (1 hour or other durations) until the ammonia nitrogen concentration of the reaction liquid drops to the first preset value or the nitrite concentration rises to the second preset value, then the current round of nitrification is stopped, that is, aeration is stopped.

[0017] Then, based on the nitrite concentration detected when the nitrification reaction stops, an appropriate amount of organic carbon source is added to the nitrification solution to carry out anoxic denitrification reaction;

[0018] During denitrification, the ammonia nitrogen concentration and nitrite concentration of the reaction liquid in the reactor are checked every certain period of time (1 hour or other durations) until the nitrite concentration of the reaction liquid drops to the third preset value, at which point the current round of denitrification is stopped; if the ammonia nitrogen concentration of the reaction liquid has not yet reached the first preset value at this time, aeration is restarted to enter the next round of nitrification reaction; if the ammonia nitrogen concentration of the reaction liquid has reached the first preset value at this time, the current denitrification treatment is ended.

[0019] Optionally, the pH range of the aeration nitrification reaction and the denitrification reaction is 7 to 9.

[0020] Optionally, the range of the first preset value is 0 to 50 PPM.

[0021] Optionally, the range of the second preset value is 1000 to 1800 PPM.

[0022] Optionally, the range of the third preset value is 0 to 30 PPM.

[0023] In this invention, the packing material adsorbing mycobacteria with accession number CCTCC M 20241347 is prepared in the following manner: the suspension of mycobacteria with accession number CCTCC M 20241347 is solidified on the packing material (the packing material includes, but is not limited to, polyester sponge, diatomaceous earth, chitosan, activated sludge and other materials that can be used as packing materials) through adsorption.

[0024] Based on the above technical solution, the beneficial effects of this application compared to the prior art include:

[0025] 1. The denitrification process in this application embodiment, by pre-filling the reactor with a highly resistant denitrifying bacterial agent, eliminates the need for dilution to reduce ammonia nitrogen concentration or pre-denitrification to reduce COD concentration in nitrogenous wastewater with both ammonia nitrogen and COD concentrations above 500 PPM. The wastewater can be directly injected into the reactor for aeration nitrification. Because the highly resistant denitrifying bacterial agent can withstand the impact of high-concentration nitrogenous wastewater (above 500 PPM), the ammonia nitrogen and COD concentrations in the reactor can be maintained at a high level above 500 PPM for extended periods, thereby reducing the inhibitory effect of high-concentration nitrogenous wastewater on the denitrifying bacterial agent and improving denitrification efficiency. Furthermore, this significantly increases the unit tank volume treatment capacity of the entire denitrification system (i.e., system ammonia nitrogen load PPM / 24H), substantially saving initial construction investment, land area, and average daily energy consumption.

[0026] 2. The denitrification process in this application embodiment can reduce the ammonia nitrogen concentration in the wastewater to below 30 PPM, approaching the discharge standard, which is beneficial for efficient and deep denitrification of high-concentration nitrogen-containing wastewater. The effluent treated by this process may be able to be discharged directly without meeting the standards, completely eliminating the need for subsequent membrane treatment processes; or, when further treated by a membrane process, the water production rate can be significantly increased and the service life of the membrane material can be extended. Compared with the current mainstream processes that heavily rely on membrane treatment, this can significantly reduce investment and operating costs (the membrane itself is a consumable and membrane treatment is very energy-intensive), as well as reduce secondary pollution caused by waste membrane materials.

[0027] 3. The denitrification system in this embodiment achieves precise and intelligent control of the nitrification and denitrification processes through the installation of a real-time detection and control device. By real-time detection of the ammonia nitrogen concentration in the nitrification liquid and the nitrite concentration in the denitrification reaction, over-nitrification and excessive carbon source addition are avoided, thereby further reducing energy consumption and significantly saving carbon sources, effectively reducing treatment costs. It also avoids the increased sludge production caused by the penetration of organic carbon sources added in the denitrification stage into the nitrification stage, which is common in traditional processes, thus significantly reducing the cost of waste sludge treatment.

[0028] 4. The denitrification system in this application embodiment enables the automation and clustering of the processing system. The miniaturization and intensification of the system significantly save space and enable faster and wider distributed deployment. At the same time, the clustered design not only maintains precise process control under large-scale processing conditions, but also enables linear and smooth expansion or reduction in scale, making it suitable for more and wider application scenarios.

[0029] Biological Preservation

[0030] The Mycobacterium ium sp. TSHB-H01 provided by this invention was deposited on July 1, 2024, at the China Center for Type Culture Collection (299 Bayi Road, Wuchang District, Wuhan, Hubei Province, within the campus of Wuhan University). The abbreviation of the depository is CCTCC, and the accession number of the strain is CCTCC M 20241347. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a denitrification system for high-concentration nitrogen-containing wastewater in an embodiment of this application;

[0032] Figure 2 This is a flow chart of the denitrification process for high-concentration nitrogen-containing wastewater in the embodiments of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Feeding tank; 2. Valves; 3. Unit controller; 4. Communication module; 5. Aeration pump; 6. Reactor;

[0035] 7. Sensor; 8. Water pump; 9. Detector; 10. Packing material adsorbed with highly resistant denitrifying bacterial agent. Detailed Implementation

[0036] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0038] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0040] The inventors, after numerous trials referencing existing technologies, discovered that current wastewater denitrification processes cannot effectively treat wastewater with initial ammonia nitrogen concentrations exceeding 300 PPM. Instead, they require diluting the nitrogenous wastewater several times, even ten times, before treatment. This dilution drastically increases the required tank volume, and coupled with the additional reaction tank volume needed for pre-denitrification, the overall system's unit tank capacity is significantly reduced. Furthermore, in current biological denitrification processes, the timing of the transition from nitrification to denitrification is particularly crucial, significantly impacting overall efficiency and cost. Insufficient nitrification time results in inadequate ammonia nitrogen degradation, while excessive nitrification time leads to the further oxidation of excessive nitrite into nitrate, directly wasting aeration energy and further wasting organic carbon sources during denitrification. Current systems primarily rely on empirical values ​​and fixed operating times for transitions. However, given that the composition, temperature, and microbial state of nitrogenous wastewater are not static, fixed-duration process transitions typically involve substantial waste.

[0041] Based on the above problems, the inventors conducted further research and development, resulting in this invention.

[0042] The present invention will be described in detail below through specific embodiments:

[0043] Example 1

[0044] Reference Figure 1 The denitrification system in this embodiment includes three loading tanks 1, one aeration pump 5, one reactor 6, and a real-time monitoring and control device. The reactor 6 has a volume of 100L and is equipped with a wastewater inlet and a reaction liquid outlet. The reactor 6 is filled with packing material 10 containing mycobacteria with preservation number CCTCC M 20241347. Each of the three loading tanks 1 is connected to the reactor 6 and controlled by a valve 2. The aeration pump 5 controls the switching between nitrification and denitrification reactions.

[0045] The real-time detection and control device includes a detector 9, a sensor 7, a unit controller 3, and a communication module 4. The detector 9 detects the ammonia nitrogen and nitrite concentrations of the reaction liquid in reactor 6 and sends the results to the unit controller 3 for processing. The detector 9 can be any existing detection device capable of detecting ammonia nitrogen and nitrite concentrations. The sensor 7 monitors the pH value of the reaction liquid in reactor 6 in real time and sends the results to the unit controller 3 for processing.

[0046] The unit controller 3 controls the switching of the aeration pump 5 according to the preset control algorithm to realize the conversion between nitrification and denitrification reactions; it also controls the switching of the valve 2 to realize the addition control of organic carbon source, acid and alkali in the feeding tank 1.

[0047] In this embodiment of the denitrification system, a water pump 8 can also be installed at the reaction liquid outlet of reactor 6 to discharge the reaction liquid from the system.

[0048] In this embodiment, landfill leachate with an ammonia nitrogen concentration of 2600 PPM and a COD concentration of 3900 PPM was selected as nitrogen-containing wastewater to complete the denitrification process.

[0049] In reactor 6, the packing material 10 containing mycobacteria with preservation number CCTCC M 20241347 occupies 40% of the volume of reactor 6.

[0050] The packing material 10, which adsorbs mycobacteria with accession number CCTCC M 20241347, is prepared as follows: the suspension of mycobacteria with accession number CCTCC M 20241347 is solidified on the packing material (polyester sponge particles) by adsorption.

[0051] Reference Figure 2 The denitrification process is operated in the above-mentioned denitrification system:

[0052] S100: Inject 100L of nitrogen-containing wastewater with an ammonia nitrogen concentration of 2600PPM and a COD concentration of 3900PPM into reactor 6, turn on the aeration pump, and carry out the aeration nitrification reaction. The temperature of the reaction liquid is controlled between 20 and 37℃, and the pH of the aeration nitrification reaction is controlled between 7 and 9.

[0053] S200: As monitored by detector 9, after 36 hours, the ammonia nitrogen concentration in the reaction liquid in reactor 6 dropped below 1100 PPM, while the nitrite concentration rose to 1500 PPM. At this point, aeration pump 5 was turned off, aeration was stopped, and the first round of nitrification reaction was halted.

[0054] S300: Unit controller 3 controls the opening of valve 2, adding 180g of sodium acetate from a feed tank 1 to reactor 6 to initiate the first round of denitrification. The pH of the denitrification reaction is controlled between 7 and 9.

[0055] S400: According to detector 9, after 24 hours, the nitrite concentration in the reaction solution in reactor 6 dropped below 30 PPM, while the ammonia nitrogen concentration remained above 1000 PPM. At this point, aeration pump 5 was turned on to restart aeration and begin the second round of nitrification.

[0056] S500: As monitored by detector 9, after 28 hours, the ammonia nitrogen concentration in the reaction liquid in reactor 6 dropped below 500 PPM, while the nitrite concentration rose to 1200 PPM. At this point, aeration pump 5 was turned off, aeration was stopped, and the second round of nitrification reaction was halted.

[0057] S600: Unit controller 3 controls the opening of valve 2, adding 140g of sodium acetate from a feed tank 1 to reactor 6 to initiate the second round of denitrification. The pH of the denitrification reaction is controlled between 7 and 9.

[0058] S700: According to detector 9, after 18 hours, the nitrite concentration in the reaction liquid in reactor 6 dropped below 30 PPM, while the ammonia nitrogen concentration remained above 400 PPM. At this point, aeration pump 5 was turned on to restart aeration and begin the third round of nitrification.

[0059] S800: As monitored by detector 9, after 24 hours, the ammonia nitrogen concentration in the reaction liquid in reactor 6 dropped below 30 PPM, while the nitrite concentration rose to 1200 PPM. At this point, aeration pump 5 was turned off, aeration was stopped, and the third round of nitrification reaction was halted.

[0060] S900: Unit controller 3 controls the opening of valve 2, adding 140g of sodium acetate from feed tank 1 to reactor 6 to initiate the third round of denitrification. The pH of the denitrification reaction is controlled between 7 and 9.

[0061] S1000: After 18 hours of monitoring, the nitrite concentration in reactor 6 dropped below 30 PPM, and the ammonia nitrogen concentration also dropped below 30 PPM. At this point, the current round of denitrification is terminated, and water pump 8 is turned on to discharge the reaction solution from the system.

[0062] The denitrification system in this embodiment has a comprehensive denitrification efficiency (i.e., ammonia nitrogen load per unit volume) of 416 PPM / 24H, consuming 4.6 kg of carbon source per ton of raw water. The specific calculation process is as follows: the initial ammonia nitrogen concentration is 2600 PPM, and the final ammonia nitrogen concentration is 30 PPM, a difference of 2570; the total time is 148 hours, or 6.17 days; therefore, the average daily decrease in ammonia nitrogen is 416 PPM. The cumulative carbon source addition over three cycles is 460 g / 100 L, which is 4.6 kg / ton of raw water.

[0063] Example 2

[0064] The difference between the denitrification system in this embodiment and that in Example 1 is that a 1L beaker is used instead of the denitrification reactor in Example 1.

[0065] The denitrification process in this embodiment includes the following steps S100-S600:

[0066] S100: Pre-place approximately 400ml of packing material containing highly resistant denitrifying bacterial agent into a 1L beaker.

[0067] The packing material adsorbed with highly resistant denitrifying bacterial agent was prepared as follows: Mycobacterium with accession number CCTCCM20241347 was cultured in pure form. The resulting strain was further processed to obtain a suspension, which was then used as the highly resistant denitrifying bacterial agent. The highly resistant denitrifying bacterial agent was then immobilized on the packing material through adsorption.

[0068] S200: Leachate from a landfill in Wuhan was selected as nitrogen-containing wastewater, with an initial ammonia nitrogen concentration of 2400 PPM and a COD concentration of 3500 PPM. 1 L of the above nitrogen-containing wastewater was added to a beaker, and then the beaker was placed on a constant temperature experimental platform at 30℃. Aeration was carried out using an aerator, and the pH of the aeration nitrification reaction was controlled between 7 and 9.

[0069] S300: After 48 hours, the ammonia nitrogen concentration in the nitrification liquid drops to 800 PPM, while the nitrite concentration rises to 1800 PPM. At this point, aeration is turned off, ending the first round of nitrification; then, 2g of sodium acetate is added to begin the first round of denitrification.

[0070] S400: After 24 hours, the nitrite concentration in the reaction solution is below 20 PPM, and the first round of denitrification is complete. At this time, turn on the aeration to start the second round of nitrification, and control the pH between 7 and 9.

[0071] S500: After 30 hours, the ammonia nitrogen in the reaction solution is below 30 PPM, and the nitrite is above 1500 PPM. At this point, aeration is turned off, ending the second round of nitrification. Then, 1.8 g of sodium acetate is added to begin the second round of denitrification.

[0072] S600: After 14 hours, when the nitrite and ammonia nitrogen in the reaction solution are below 30 PPM, the denitrification cycle ends, and the water valve is opened to drain the reaction solution.

[0073] The denitrification system in this embodiment has a comprehensive denitrification efficiency of 490 PPM / 24H and consumes 3.8g of carbon source per liter of raw water.

[0074] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," just as "comprising" is interpreted as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A denitrification system for high concentration nitrogen-containing sewage, characterized by comprising: The denitrification system comprises a charging tank, an aeration pump, a reactor and a real-time detection control device. The charging tank is in communication with the reactor and is controlled by a valve. The aeration pump controls the conversion between nitrification and denitrification. The reactor is filled with a filler adsorbed with Mycobacterium with the preservation number CCTCC M 20241347. The real-time detection control device detects the ammonia nitrogen concentration, nitrite concentration and pH value of the reaction liquid in the reactor and controls the on-off of the aeration pump based on the detected ammonia nitrogen concentration, nitrite concentration and pH value of the reaction liquid in the reactor to realize the conversion between nitrification and denitrification. The real-time detection control device compares the ammonia nitrogen concentration of the reaction liquid with a first preset value and compares the nitrite concentration of the reaction liquid with a second preset value in the nitrification stage and issues a stop-aeration instruction.

2. The denitrification system for high concentration nitrogen-containing sewage according to claim 1, wherein The real-time detection control device compares the nitrite concentration of the reaction liquid with a third preset value and compares the ammonia nitrogen concentration of the reaction liquid with the first preset value in the denitrification stage and issues an instruction to discharge the reaction liquid from the system.

3. The denitrification system for high concentration nitrogen-containing sewage water according to claim 1, wherein The real-time detection control device calculates the amount of organic carbon source required for completing the denitrification reaction according to the initial nitrite concentration at the start of the denitrification reaction and issues an instruction to supply the organic carbon source into the reactor.

4. A process for denitrification of high-strength nitrogen-containing sewage, characterized by, A water pump is arranged at the outlet of the reactor for discharging the reaction liquid from the system. The filler adsorbed with Mycobacterium with the preservation number CCTCC M 20241347 accounts for more than 40% of the volume of the reactor. The denitrification system of high-concentration nitrogen-containing wastewater according to any one of claims 1-3 is operated, comprising: injecting the nitrogen-containing wastewater into the reactor filled with the filler adsorbed with Mycobacterium with the preservation number CCTCC M 20241347; alternately performing aeration nitrification and anoxic denitrification; detecting the ammonia nitrogen concentration and nitrite concentration of the reaction liquid in the reactor at intervals during the nitrification until the ammonia nitrogen concentration of the reaction liquid decreases to a first preset value or the nitrite concentration increases to a second preset value, then stopping the nitrification of the current round, i.e. stopping aeration; 5. The process for denitrification of high-strength nitrogen-containing sewage water according to claim 4, characterized in that, then adding an appropriate amount of organic carbon source into the nitrification liquid according to the detected nitrite concentration at the time when the nitrification is stopped to perform anoxic denitrification; 6. The process for denitrification of high-strength nitrogen-containing sewage water as claimed in claim 4, characterized in that, detecting the ammonia nitrogen concentration and nitrite concentration of the reaction liquid in the reactor at intervals during the denitrification until the nitrite concentration of the reaction liquid decreases to a third preset value, then stopping the denitrification of the current round; if the ammonia nitrogen concentration of the reaction liquid has not reached the first preset value at this time, restarting aeration to enter the next round of nitrification; if the ammonia nitrogen concentration of the reaction liquid has reached the first preset value at this time, ending the denitrification treatment.

7. The process for denitrification of high-strength nitrogen-containing sewage water as claimed in claim 4, characterized in that, The pH value of the aeration nitrification and the denitrification ranges from 7 to 9. The first preset value ranges from 0 to 50 PPM. The second preset value ranges from 1000 to 1800 PPM.

8. The process for denitrification of high-strength nitrogen-containing sewage water as claimed in claim 4, characterized by, The third preset value ranges from 0 to 30 PPM.

9. The process for denitrification of high-strength nitrogen-containing sewage water as claimed in claim 4, characterized in that, The filler with the mycobacterium with the preservation number CCTCC M 20241347 adsorbed thereon is prepared in the following manner: the suspension of the mycobacterium with the preservation number CCTCC M 20241347 is solidified on the filler by adsorption.

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