A high-concentration nitrate wastewater treatment system

Abstract

The utility model discloses a kind of high-concentration nitrate wastewater treatment systems, including sequentially communicating wastewater collection tank, adjusting pool, anoxic tank, sedimentation tank, facultative pond, aerobic tank and secondary sedimentation tank.Wastewater collection tank enters adjusting pool after collecting wastewater, adjusting pool enters anoxic tank after carrying out acid-base adjustment, anoxic tank is equipped with carbon source adding device, wastewater enters sedimentation tank after anoxic tank processing, sedimentation tank carries out solid-liquid separation, part of sludge backflow to anoxic tank, part enters sludge concentration tank, supernatant enters facultative pond, facultative pond is equipped with carbon source adding device, nitrification liquid backflow pipe is equipped between aerobic tank and facultative pond, part of sewage in aerobic tank is backflowed to facultative pond by nitrification liquid backflow pipe;Secondary sedimentation tank and facultative pond are equipped with sludge backflow pipe, part of sludge in secondary sedimentation tank backflow to facultative pond, and remaining sludge is discharged to sludge concentration tank by sludge discharge pipe.The utility model can treat high-concentration nitrate wastewater by controlling process condition, and it is strong in processing capacity, and process is efficient and stable.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a high-concentration nitrate wastewater treatment system. Background Technology

[0002] With the rapid development of the domestic economy, the amount of industrial wastewater has increased exponentially. Much of this wastewater cannot be treated at low cost and is ultimately treated through high-cost processes such as incineration and evaporation, which increases the operating costs of enterprises and is detrimental to their healthy development.

[0003] Using biological methods to treat high-concentration nitrate wastewater is a trend in industrial wastewater treatment, opening up a new field for the biological treatment of high-concentration nitrate wastewater. This can greatly reduce wastewater treatment costs and promote the healthy development of enterprises. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a high-concentration nitrate wastewater treatment system to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A high-concentration nitrate wastewater treatment system includes a wastewater collection tank, an equalization tank, an anoxic tank, a sedimentation tank, an anaerobic tank, an aerobic tank, and a secondary sedimentation tank connected in sequence.

[0007] Preferably, the high-concentration nitrate wastewater treatment system includes a sludge thickening tank, the inlet of which is connected to the sludge discharge outlet of the sedimentation tank and the sludge discharge outlet of the secondary sedimentation tank.

[0008] Preferably, a first sludge return pipe is provided between the anoxic tank and the sedimentation tank; a second sludge return pipe is provided between the facultative tank and the secondary sedimentation tank; and a nitrification liquid return pipe is provided between the facultative tank and the aerobic tank.

[0009] Preferably, a first return pump, a second return pump, and a third return pump are respectively installed on the first sludge return pipe, the second sludge return pipe, and the nitrification liquid return pipe.

[0010] Preferably, the anoxic tank is filled with polyurethane biological packing material, with a filling rate of 20-40%, preferably 30%.

[0011] Preferably, the anoxic tank is equipped with a submersible agitator, the rotation speed of which is 800-1200 rpm, preferably 1000 rpm; the wastewater flow pattern in the anoxic tank is plug flow.

[0012] Preferably, the aerobic tank contains MBBR biological packing material with a filling rate of 20% to 40%, preferably 30%.

[0013] Preferably, the high-concentration nitrate wastewater treatment system includes a central control system; the equalization tank is equipped with an acid-base adjustment device.

[0014] Preferably, the anoxic tank is equipped with a first total nitrogen analyzer, a first industrial online pH controller, and a first carbon source addition device, all connected to the central control system. The first total nitrogen analyzer is used to detect the total nitrogen content of the wastewater in the anoxic tank and controls the amount of carbon source added by the first carbon source addition device through the central control system, thereby controlling the total organic carbon content of the wastewater in the anoxic tank to be 3 to 5 times the total nitrogen content. The first industrial online pH controller is used to detect the pH value of the wastewater in the anoxic tank and controls the amount of alkali or acid added by the acid-base adjustment device in the adjustment tank through the central control system, thereby controlling the pH of the wastewater in the anoxic tank to be 7 to 8.

[0015] Preferably, the suspended solids concentration (SS) of the anoxic pool is 3000-6000 mg / L, and more preferably 5000 mg / L.

[0016] Preferably, the pH value of the sedimentation tank is controlled at 7.0 to 8.5, and the surface hydraulic loading is controlled at 0.5 to 1.0 m. 3 / (m 2 ·h).

[0017] Preferably, the sludge return ratio of the sedimentation tank is 50% to 100% relative to the influent flow rate of the anoxic tank.

[0018] Preferably, the anoxic tank is equipped with a second total nitrogen analyzer, a second carbon source addition device, a first industrial online dissolved oxygen analyzer, and a second industrial online pH controller, all connected to the central control system. The second total nitrogen analyzer is used to detect the total nitrogen content of the wastewater in the anoxic tank and controls the amount of carbon source added by the second carbon source addition device through the central control system, thereby controlling the total organic carbon content of the wastewater in the anoxic tank to be 3 to 5 times the total nitrogen content. The second industrial online pH controller is used to detect the pH value of the wastewater in the anoxic tank and controls the amount of alkali or acid added by the acid-base adjustment device in the equalization tank through the central control system, thereby controlling the pH of the wastewater in the anoxic tank to be 6.8 to 7.8. The first industrial online dissolved oxygen analyzer is used to monitor the dissolved oxygen content of the wastewater in the anoxic tank. When the dissolved oxygen content of the wastewater in the anoxic tank does not meet the standard, that is, when the dissolved oxygen is greater than 0.5 mg / L, the sludge return flow rate of the secondary sedimentation tank is manually adjusted.

[0019] Preferably, the total nitrogen volumetric loading of the anoxic tank is 0.05 ~ 0.08 kg TN / (m³·d), and the SS is controlled at 2000 ~ 4000 mg / L, preferably 3000 mg / L.

[0020] Preferably, the aerobic tank is equipped with an aeration disc at the bottom; a blower is installed outside the aerobic tank; the blower is connected to the aeration disc via a pipeline; the aerobic tank is equipped with a second industrial online dissolved oxygen meter and a third industrial online pH controller, both connected to the central control system; the second industrial online dissolved oxygen meter is used to detect the dissolved oxygen content of the wastewater in the aerobic tank, and controls the operating frequency of the blower through the central control system, thereby controlling the dissolved oxygen content of the wastewater in the aerobic tank to be 2-4 mg / L; the third industrial online pH controller is used to detect the pH value of the wastewater in the aerobic tank, and controls the amount of alkali or acid added by the acid-base adjustment device installed in the equalization tank through the central control system, thereby controlling the pH value of the wastewater in the aerobic tank to be 7-8.

[0021] Preferably, the SS in the aerobic tank (6) is controlled at 2000 ~ 4000 mg / L, and more preferably 3000 mg / L.

[0022] Preferably, the nitrification liquor recirculation ratio of the aerobic tank is 100% to 300% relative to the influent flow rate of the facultative tank.

[0023] Preferably, the surface hydraulic loading of the secondary sedimentation tank is 0.6 ~ 0.8 m. 3 / (m 2 ·h).

[0024] Preferably, the sludge return ratio of the secondary sedimentation tank is 50% to 100% relative to the influent flow rate of the anoxic tank.

[0025] Beneficial effects:

[0026] (1) The process of this utility model treats high-concentration nitrate wastewater through a biochemical process; therefore, the treatment cost is significantly reduced compared to general treatment processes.

[0027] (2) This utility model sets up an industrial pH controller in the denitrification tank and links it with the acid-base dosing system in the equalization tank to ensure the stability of the wastewater entering the denitrification tank. At the same time, it sets up a total nitrogen measuring instrument linked with the acetic acid dosing device to adjust the dosing amount, ensuring the stability of the process and optimizing the dosing amount to reduce operating costs. The carbon source dosing device in the facultative tank is also designed to be linked with the total nitrogen measuring instrument to accurately determine the dosing amount, ensuring the stability of denitrification in the facultative tank and guaranteeing the stable operation of the system. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0029] Figure 1 This is a schematic diagram of the high-concentration nitrate wastewater treatment system in Example 1.

[0030] In the diagram: 1. Wastewater collection tank; 2. Equalization tank; 3. Anoxic tank; 4. Sedimentation tank; 5. Anoxic tank; 6. Aerobic tank; 7. Secondary sedimentation tank; 8. Sludge thickening tank. Detailed Implementation

[0031] The present invention will be further described below with reference to the following embodiments. It should be understood that the following embodiments are only for illustrating the present invention and are not intended to limit the present invention.

[0032] The structures, proportions, and sizes shown in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0033] Example 1

[0034] like Figure 1 The diagram shown is a schematic of the high-concentration nitrate wastewater treatment system in this embodiment. The high-concentration nitrate wastewater treatment system in this embodiment includes a wastewater collection tank 1, an equalization tank 2, an anoxic tank 3, a sedimentation tank 4, an anaerobic tank 5, an aerobic tank 6, and a secondary sedimentation tank 7, connected in sequence. It also includes a sludge thickening tank 8, the inlet of which is connected to the sludge discharge outlets of the sedimentation tank 4 and the secondary sedimentation tank 7. The anoxic tank 3 is filled with polyurethane biological packing material, with a filling rate of 30%. The anaerobic tank 5 is equipped with a submersible mixer to ensure a plug flow pattern for the wastewater in the anaerobic tank 5. The aerobic tank 6 is filled with MBBR biological packing material, with a filling rate of 30%.

[0035] A first sludge return pipe is provided between the anoxic tank 3 and the sedimentation tank 4; a second sludge return pipe is provided between the facultative tank 5 and the secondary sedimentation tank 7; and a nitrification liquid return pipe is provided between the facultative tank 5 and the aerobic tank 6. A first return pump, a second return pump, and a third return pump (not shown in the figure) are respectively installed on the first sludge return pipe, the second sludge return pipe, and the nitrification liquid return pipe.

[0036] The equalization tank 2 is equipped with an acid-base adjustment device. The anoxic tank 3 is equipped with a first total nitrogen analyzer, a first industrial online pH controller, and a first carbon source addition device. The first industrial online pH controller in the anoxic tank 3 is used to detect the pH value of the wastewater in the anoxic tank 3 and controls the amount of alkali or acid added by the acid-base adjustment device in the equalization tank 2 through a central control system. The first total nitrogen analyzer in the anoxic tank 3 is used to detect the total nitrogen content of the wastewater in the anoxic tank 3 and controls the amount of carbon source added by the first carbon source addition device through a central control system.

[0037] The anoxic tank 5 is equipped with a second total nitrogen analyzer, a second carbon source addition device, a first industrial online dissolved oxygen analyzer, and a second industrial online pH controller. The second total nitrogen analyzer is used to detect the total nitrogen content of the wastewater in the anoxic tank 5 and controls the amount of carbon source added by the second carbon source addition device through a central control system. The second industrial online pH controller is used to detect the pH value of the wastewater in the anoxic tank 5 and controls the amount of alkali or acid added by the acid-base adjustment device in the equalization tank 2 through a central control system. The first industrial online dissolved oxygen analyzer is used to monitor the dissolved oxygen content of the wastewater in the anoxic tank 5. When the dissolved oxygen content of the wastewater in the anoxic tank 5 does not meet the standard, the sludge return flow rate of the secondary sedimentation tank 7 is manually adjusted.

[0038] The aerobic tank 6 is equipped with an aeration disc at the bottom; a blower is installed outside the aerobic tank 6; the blower is connected to the aeration disc through a pipeline; the aerobic tank 6 is equipped with a second industrial online dissolved oxygen meter and a third industrial online pH controller; the second industrial online dissolved oxygen meter is used to detect the dissolved oxygen content of the wastewater in the aerobic tank 6 and controls the working frequency of the blower through a central control system; the third industrial online pH controller is used to detect the pH value of the wastewater in the aerobic tank 6 and controls the amount of alkali or acid added by the acid-base adjustment device installed in the equalization tank 2 through a central control system.

[0039] Example 2

[0040] The high-concentration nitrate wastewater treatment system of Example 1 was used to treat a company's high-concentration nitrate wastewater (total nitrogen content approximately 20,000 mg / L, NO3-) - The treatment process and process conditions for each wastewater treatment unit (with a nitrogen content of approximately 19,000 mg / L) are as follows:

[0041] Wastewater is collected in wastewater collection tank 1 and then flows into equalization tank 2 and anoxic tank 3. A first industrial online pH controller in the anoxic tank 3 detects the pH value of the wastewater in the anoxic tank 3 and controls the amount of alkali or acid added by the acid-base adjustment device in equalization tank 2 via a central control system. This controls the pH of the wastewater after neutralization in the anoxic tank 3 to be between 7 and 8. The hydraulic retention time (HRT) of the wastewater in collection tank 1 is 4 hours, and the HRT in equalization tank 2 is 24 hours.

[0042] Wastewater flows into anoxic tank 3, where the suspended solids (SS) concentration is 5000 mg / L and the total nitrogen volumetric loading is 2 kg TN / (m³). 3 •d). The first total nitrogen analyzer installed in the anoxic tank 3 detects the total nitrogen content of the wastewater in the anoxic tank 3 and controls the amount of carbon source added by the first carbon source addition device in the anoxic tank 3 through the central control system. This controls the total organic carbon content of the wastewater in the anoxic tank 3 to be three times the total nitrogen content, ensuring sufficient denitrification reaction in the wastewater in the anoxic tank 3 and ensuring that the total nitrogen removal rate in the wastewater reaches more than 90%. The carbon source contained in the first carbon source addition device is a 30 wt% glacial acetic acid aqueous solution. The HRT of the wastewater in the anoxic tank 3 is 240 h.

[0043] After treatment in the anoxic tank 3, the wastewater enters the sedimentation tank 4 for solid-liquid separation. The pH value of the sedimentation tank 4 is controlled at 7.0~8.5, and the surface hydraulic loading is 0.5 m. 3 / (m 2 (h). Part of the settled sludge enters the sludge thickening tank 8, and part is returned to the anoxic tank 3. The sludge return ratio of the anoxic tank 3 is 100%, and the supernatant enters the facultative tank 5.

[0044] The supernatant from sedimentation tank 4 enters anoxic tank 5, which simultaneously receives nitrified liquid returned from aerobic tank 6. Wastewater undergoes denitrification in anoxic tank 5 to remove nitrogen, while also removing organic matter and other pollutants. The total nitrogen volumetric loading rate of anoxic tank 5 is 0.08 kg TN / (m³). 3 •d), SS is 3000 mg / L. The submersible agitator in anoxic tank 5 rotates at 1000 rpm. A second total nitrogen analyzer is installed in anoxic tank 5 to detect the total nitrogen content of the wastewater. The amount of carbon source added by the second carbon source addition device in anoxic tank 5 is controlled by the central control system, thereby controlling the total organic carbon content of the wastewater in anoxic tank 5 to be 5 times the total nitrogen content. The carbon source in the second carbon source addition device is a 30 wt% glacial acetic acid aqueous solution. The pH of the wastewater in anoxic tank 5 is controlled at 6.8 ~ 7.8, and the dissolved oxygen content is controlled at 0.2 ~ 0.5 mg / L. The HRT of the wastewater in anoxic tank 5 is 120 h. The wastewater after denitrification treatment in anoxic tank 5 overflows into aerobic tank 6.

[0045] In aerobic tank 6, residual ammonia nitrogen in the wastewater is oxidized to nitrate nitrogen. Part of the wastewater is returned to facultative tank 5 via the nitrification liquid return pipe for denitrification treatment, with a nitrification liquid return ratio of 300%. Part of the wastewater enters secondary sedimentation tank 7 for precipitation. The dissolved oxygen content in aerobic tank 6 is controlled at 2-4 mg / L, the pH value at 7-8, and the suspended solids (SS) at 3000 mg / L. The total nitrogen volumetric loading rate in aerobic tank 6 is 0.08 kg TN / (m³). 3 •d). The HRT of the wastewater in aerobic tank 6 is 120 h.

[0046] After treatment in aerobic tank 6, the wastewater enters secondary sedimentation tank 7 for settling. The surface hydraulic loading of secondary sedimentation tank 7 is 0.6 m. 3 / (m 2 (h). A portion of the settled sludge is returned to the anoxic tank 5 via the sludge return system, with a sludge return ratio of 100%. The remaining sludge is discharged to the sludge thickening tank 8 via the sludge discharge system. The supernatant is discharged after meeting the standards. The sludge in the sludge thickening tank is then outsourced for further treatment after filter pressing.

[0047] Using the process conditions of this embodiment to treat the high-concentration nitrate wastewater from a certain enterprise, the acclimatization period was 7 days. After the system operated stably for a period of time, the total nitrogen in the effluent was <100 mg / L, and NO3- was <100 mg / L. - -N < 10 mg / L, and detailed water quality data for the effluent are shown in Table 1.

[0048] Table 1. Water quality data before and after treatment by the high-concentration nitrate wastewater treatment system.

[0049]

[0050] Example 3

[0051] The high-concentration nitrate wastewater treatment system of Example 1 was used to treat a company's high-concentration nitrate wastewater (total nitrogen content approximately 2000 mg / L, NO3-) - The treatment process and process conditions for each wastewater treatment unit (with a nitrogen content of approximately 1800 mg / L) are as follows:

[0052] Wastewater is collected in wastewater collection tank 1 and then flows into equalization tank 2 and anoxic tank 3. A first industrial online pH controller in the anoxic tank 3 detects the pH value of the wastewater in the anoxic tank 3 and controls the amount of alkali or acid added by the acid-base adjustment device in equalization tank 2 via a central control system. This controls the pH of the wastewater after neutralization in the anoxic tank 3 to be between 7 and 8. The hydraulic retention time (HRT) of the wastewater in collection tank 1 is 4 hours, and the HRT in equalization tank 2 is 12 hours.

[0053] Wastewater flows into anoxic tank 3, where the suspended solids (SS) concentration is 3000 mg / L and the total nitrogen volumetric loading is 1.33 kg TN / (m³). 3 •d). A first total nitrogen analyzer installed in anoxic tank 3 detects the total nitrogen content of the wastewater in anoxic tank 3. The central control system controls the amount of carbon source added by the first carbon source addition device in anoxic tank 3, thereby controlling the total organic carbon content of the wastewater in anoxic tank 3 to be 5 times the total nitrogen content. This ensures sufficient denitrification of the wastewater in anoxic tank 3 and guarantees a total nitrogen removal rate of over 90%. The carbon source in the first carbon source addition device is a 30 wt% glacial acetic acid aqueous solution. The HRT (heat retention time) of the wastewater in anoxic tank 3 is 36 h.

[0054] After treatment in anoxic tank 3, the wastewater enters sedimentation tank 4 for solid-liquid separation. The pH value of sedimentation tank 4 is controlled at 7.0~8.5, and the surface hydraulic loading is 1 m. 3 / (m 2 (h). Part of the settled sludge enters the sludge thickening tank 8, and part is returned to the anoxic tank 3. The sludge return ratio of the anoxic tank 3 is 50%, and the supernatant enters the facultative tank 5.

[0055] The supernatant from sedimentation tank 4 enters anoxic tank 5, which simultaneously receives nitrified liquid returned from aerobic tank 6. Wastewater undergoes denitrification in anoxic tank 5 to remove nitrogen, while also removing organic matter and other pollutants. The total nitrogen volumetric loading of anoxic tank 5 is 0.05 kg TN / (m³). 3 •d), SS is 2000 mg / L. The submersible agitator in anoxic tank 5 rotates at 1000 rpm. A second total nitrogen analyzer is installed in anoxic tank 5 to detect the total nitrogen content of the wastewater. The central control system controls the amount of carbon source added by the second carbon source addition device in anoxic tank 5, thereby controlling the total organic carbon content of the wastewater in anoxic tank 5 to be 3 times the total nitrogen content. The carbon source in the second carbon source addition device is a 30 wt% glacial acetic acid aqueous solution. The pH of the wastewater in anoxic tank 5 is controlled at 6.8 ~ 7.8, and the dissolved oxygen content is controlled at 0.2 ~ 0.5 mg / L. The HRT of the wastewater in anoxic tank 5 is 18 h. The wastewater after denitrification treatment in anoxic tank 5 overflows into aerobic tank 6.

[0056] In aerobic tank 6, residual ammonia nitrogen in the wastewater is oxidized to nitrate nitrogen. Part of the wastewater is returned to facultative tank 5 via the nitrification liquor return pipe for denitrification treatment, with a nitrification liquor return ratio of 300%. Part of the wastewater enters secondary sedimentation tank 7 for precipitation. The dissolved oxygen content in aerobic tank 6 is controlled at 2–4 mg / L, the pH value at 7–8, and the suspended solids (SS) at 2000 mg / L. The total nitrogen volumetric loading rate in aerobic tank 6 is 0.05 kg TN / (m³·d). The heat transfer time (HRT) of the wastewater in aerobic tank 6 is 12 h.

[0057] After treatment in aerobic tank 6, the wastewater enters secondary sedimentation tank 7 for settling. The surface hydraulic loading of secondary sedimentation tank 7 is 0.8 m. 3 / (m 2 (h). A portion of the settled sludge is returned to the anoxic tank 5 via the sludge return system, with a sludge return ratio of 50%. The remaining sludge is discharged to the sludge thickening tank 8 via the sludge discharge system. The supernatant is discharged after meeting the standards. The sludge in the sludge thickening tank is then outsourced for further treatment after filter pressing.

[0058] Using the process conditions of this embodiment to treat the high-concentration nitrate wastewater from a certain enterprise, the acclimatization period was 7 days. After the system operated stably for a period of time, the total nitrogen in the effluent was <20 mg / L, and NO3- was <20 mg / L. - -N < 2 mg / L, and detailed water quality data for the effluent are shown in Table 2.

[0059] Table 2. Water quality data before and after treatment by the high-concentration nitrate wastewater treatment system.

[0060]

[0061] This utility model provides a concept and method for treating high-concentration nitrate wastewater. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A high-concentration nitrate wastewater treatment system, characterized in that, The system includes a wastewater collection tank (1), an equalization tank (2), an anoxic tank (3), a sedimentation tank (4), an anaerobic tank (5), an aerobic tank (6), and a secondary sedimentation tank (7) connected in sequence; it also includes a sludge thickening tank (8); the inlet of the sludge thickening tank (8) is connected to the sludge discharge outlet of the sedimentation tank (4) and the sludge discharge outlet of the secondary sedimentation tank (7); a first sludge return pipe is provided between the anoxic tank (3) and the sedimentation tank (4); a second sludge return pipe is provided between the anaerobic tank (5) and the secondary sedimentation tank (7); a nitrification liquid return pipe is provided between the anaerobic tank (5) and the aerobic tank (6); the anoxic tank (3) is filled with polyurethane biological packing material; and the aerobic tank (6) is filled with MBBR biological packing material.

2. The high-concentration nitrate wastewater treatment system according to claim 1, characterized in that, The filling rate of the polyurethane biological packing material in the anoxic pool (3) is 20-40%.

3. The high-concentration nitrate wastewater treatment system according to claim 1, characterized in that, The anoxic pool (5) is equipped with a submersible mixer.

4. The high-concentration nitrate wastewater treatment system according to claim 1, characterized in that, The MBBR biological packing material added to the aerobic tank (6) has a filling rate of 20% to 40%.

5. The high-concentration nitrate wastewater treatment system according to claim 1, characterized in that, It includes a central control system; the regulating tank (2) is equipped with an acid-base regulating device.

6. The high-concentration nitrate wastewater treatment system according to claim 5, characterized in that, The anoxic tank (3) is equipped with a first total nitrogen analyzer, a first industrial online pH controller, and a first carbon source addition device, all of which are connected to the central control system. The first total nitrogen analyzer is used to detect the total nitrogen content of the wastewater in the anoxic tank (3) and to control the amount of carbon source added by the first carbon source addition device through the central control system. The first industrial online pH controller is used to detect the pH value of the wastewater in the anoxic tank (3) and to control the amount of alkali or acid added by the acid-base adjustment device in the regulating tank (2) through the central control system.

7. The high-concentration nitrate wastewater treatment system according to claim 5, characterized in that, The anoxic tank (5) is equipped with a second total nitrogen analyzer, a second carbon source addition device, a first industrial online dissolved oxygen analyzer, and a second industrial online pH controller, all connected to the central control system. The second total nitrogen analyzer is used to detect the total nitrogen content of the wastewater in the anoxic tank (5) and to control the amount of carbon source added by the second carbon source addition device through the central control system. The second industrial online pH controller is used to detect the pH value of the wastewater in the anoxic tank (5) and to control the amount of alkali or acid added by the acid-base adjustment device in the regulating tank (2) through the central control system. The first industrial online dissolved oxygen analyzer is used to monitor the dissolved oxygen content of the wastewater in the anoxic tank (5).

8. The high-concentration nitrate wastewater treatment system according to claim 6, characterized in that, The aerobic tank (6) is equipped with an aeration disc at the bottom; a blower is installed outside the aerobic tank (6); the blower is connected to the aeration disc through a pipeline; a second industrial online dissolved oxygen meter and a third industrial online pH controller are installed in the aerobic tank (6) and are respectively connected to the central control system; the second industrial online dissolved oxygen meter is used to detect the dissolved oxygen content of the wastewater in the aerobic tank (6) and controls the working frequency of the blower through the central control system; the third industrial online pH controller is used to detect the pH value of the wastewater in the aerobic tank (6) and controls the amount of alkali or acid added by the acid-base adjustment device installed in the regulating tank (2) through the central control system.

Images