Device and method for realizing sewage denitrification through acidophilic shortcut nitrification / anaerobic ammonia oxidation

Abstract

The invention discloses a device and a method for realizing sewage denitrification through acidophilic shortcut nitrification / anaerobic ammonia oxidation. 80% of domestic sewage in the raw water tank enters the alkalinity adjusting tank, the molar ratio of alkalinity (based on CaCO3) to NH4 < + > is adjusted to 0.7-0.75, and the rest 20% of domestic sewage enters the middle water tank. The alkalinity-adjusted sewage enters an acidophilic short-cut nitrification reactor, 70% of NH4 < + > is oxidized into NO2 <-> by acidophilic ammonia oxidizing bacteria, the alkalinity is consumed, so that the pH is smaller than 7, different nitrite nitrogen oxidizing bacteria are effectively inhibited, and NO2 <-> is stably accumulated. Acidic effluent and domestic sewage are mixed in a middle water tank to form neutral sewage with the NH4 < + > / NO2 <-> mass concentration ratio of 1: 1-1: 1.32, then the neutral sewage enters an anaerobic ammonium oxidation reactor, NH4 < + > and NO2 <-> are synchronously removed by anaerobic ammonium oxidation bacteria, and NO3 <-> is further removed by heterotrophic denitrifying bacteria by utilizing a carbon source in the sewage. According to the method, the bottleneck of ecological niche overlapping of traditional ammonia oxidizing bacteria and nitrite nitrogen oxidizing bacteria is broken through, NO3 <-> is removed without an external carbon source, and efficient and deep nitrogen removal is achieved.

Description

Technical Field

[0001] The present invention relates to a device and a method for achieving sewage denitrification by acidophilic short-range nitrification / anaerobic ammonium oxidation, and belongs to the technical field of biological denitrification of domestic sewage. Background Art

[0002] Domestic sewage, an inevitable byproduct of human life and urban operations, contains large amounts of nitrogen pollutants. Directly discharging domestic sewage without proper treatment can cause eutrophication, damage the aquatic ecosystem, and seriously endanger human health. Currently, sewage treatment plants generally use the "nitrification-denitrification" (CN / DN) biological treatment method to remove nitrogen from domestic sewage. This process is easy to configure and provides stable treatment results. However, this process presents serious energy efficiency and sustainability issues. According to statistics, sewage treatment plants consume approximately 3% of the world's total energy consumption and produce approximately 1.6% of global greenhouse gas emissions. The United Nations Sustainable Development Goals call for sewage treatment plants to achieve low-energy, low-carbon sewage treatment processes while meeting emission standards.

[0003] The anaerobic ammonium oxidation (Anammox) process, discovered in the late 1990s, is known as the "cleanest" biological denitrification process. Anaerobic ammonium oxidizing bacteria (AnAOB) in an anaerobic environment, use NO2 - As electron donor, NH4 + Oxidation to N2 removal (NH4 + +1.32NO2 - →1.02N2+0.26NO3 - This process does not require aeration and carbon sources, providing a solution for sewage treatment plants to achieve sustainable sewage treatment processes. However, the inorganic nitrogen in domestic sewage is mainly NH4 + Exists in the form of almost no NO2 - , Anammox cannot be directly applied to domestic sewage treatment. Researchers have controlled NH4 + Oxidation of NO2 - , and prevent NO2 - Further oxidized to NO3 - , thereby achieving NO2 - The accumulation of nitrogen is then coupled with the Anammox process for denitrification, a process known as short-cut nitrification anaerobic ammonium oxidation (PN / A). Compared with CN / DN, PN / A can save 60% of aeration energy and 100% of additional carbon source, and reduce sludge production and N2O gas emissions by 90% and 100% respectively. The PN / A process was originally used to treat high NH4 +Wastewater, such as late-stage landfill leachate, textile wastewater, anaerobic digestate, etc., and has successfully achieved full-scale application in the field of anaerobic digestate treatment. However, the PN / A process has not yet been able to achieve full-scale large-scale application in domestic sewage treatment. One of the key bottlenecks is the inability to stably inhibit nitrite-oxidizing bacteria (NOB) and thus achieve NO2 - of stable accumulation.

[0004] 1 mol NH4 + Oxidation consumes 1 mol of alkalinity (calculated as CaCO3) and produces 2 mol of H + , when alkalinity and NH4 + The molar ratio is less than 1, and the H + It cannot be completely neutralized, which will cause the pH to drop. The acidophilic short-range nitrification process continuously treats low alkalinity NH4 through activated sludge. + Wastewater reduces the pH of the environment, thereby cultivating acid-resistant ammonia oxidizing bacteria (AOB), which drive NH4 in the acidic environment + Oxidation reaction. At the same time, under low pH conditions, the concentration of NO2 at the level of domestic sewage - It can ionize and produce high concentration of free nitrite, effectively inhibiting different NOB in situ and blocking NO2 - Further oxidized to NO3 - , thereby achieving NO2 - However, low-pH wastewater treated with acidophilic short-range nitrification cannot be directly used in the Anammox process. Research has shown that AnAOB only thrives in environments with a pH of 6.8-8.5 and loses activity and ceases proliferation below a pH of 6.5. Acidic effluent is a major bottleneck hindering the coupling of acidophilic PN with Anammox. Summary of the Invention

[0005] The present invention discloses an apparatus and method for achieving wastewater denitrification by acidophilic short-range nitrification / anaerobic ammonium oxidation, which belongs to the technical field of biological denitrification of domestic sewage. Specifically, 80% of the domestic sewage in the raw water tank enters the alkalinity regulating tank to adjust the alkalinity (calculated as CaCO3) and NH4 + The molar ratio is adjusted to 0.7-0.75, and the remaining 20% of the domestic sewage in the raw water tank enters the intermediate water tank; the domestic sewage after adjusting the alkalinity enters the acidophilic short-range nitrification sequencing batch reactor, and the acidophilic ammonia oxidizing bacteria converts 70% NH4 + Oxidized to NO2 - At the same time, the alkalinity is consumed to cause the effluent pH to be less than 7, effectively inhibiting different nitrite nitrogen oxidizing bacteria and achieving NO2 - Stable accumulation of NO2 -The acidic effluent is discharged into the intermediate water tank and mixed with domestic sewage to obtain NH4 + and NO2 - Neutral sewage with a mass concentration ratio of 1:1-1:1.32 enters the anaerobic ammonium oxidation sequencing batch reactor; anaerobic ammonium oxidizing bacteria simultaneously remove NH4 at a ratio close to 1:1 + and NO2 - The heterotrophic denitrifying bacteria coexisting in the system use the carbon source in the domestic sewage to metabolize the NO3 produced by anaerobic ammonia oxidation - Further removal.

[0006] The purpose of the present invention is to experiment through the following technical solutions:

[0007] The device for achieving wastewater denitrification by acidophilic shortcut nitrification / anaerobic ammonium oxidation is characterized by comprising a raw water tank (1), an alkalinity regulating tank (2), an acidophilic shortcut nitrification sequencing batch reactor (3), an intermediate water tank (4), an anaerobic ammonium oxidation sequencing batch reactor (5), an outlet water tank (6), and an automatic control system (7);

[0008] The raw water tank (1) is provided with a first water outlet (1.1) and a second water outlet (1.2); the alkalinity regulating tank (2) is provided with a first water inlet peristaltic pump (2.1), a first water inlet (2.2), and a third water outlet (2.3); the acidophilic short-range nitrification sequencing batch reactor (3) is provided with a second water inlet peristaltic pump (3.1), a second water inlet (3.2), an air compressor (3.3), a gas flow meter (3.4), an aeration sand head (3.5), a first stirrer (3.6), a pH / DO online monitoring device (3.7), and a fourth water outlet (3.8), a first water outlet peristaltic pump (3.9); the intermediate water tank (4) is provided with a third water inlet (4.1), a fourth water inlet (4.2), a fifth water outlet (4.3), and a third water inlet peristaltic pump (4.4); the anaerobic ammonia oxidation sequencing batch reactor (5) is provided with a fourth water inlet peristaltic pump (5.1), a sixth water inlet (5.2), a second agitator (5.3), a pH online monitoring device (5.4), a sixth water outlet (5.5), and a second water outlet peristaltic pump (5.6); the water outlet tank (6) is provided with a seventh water inlet (6.1);

[0009] The first water outlet (1.1) of the raw water tank (1) is connected to the first water inlet (2.2) of the alkalinity regulating tank (2) through a first water inlet peristaltic pump (2.1), and the second water outlet (1.2) is connected to the fourth water inlet (4.2) of the intermediate water tank (4) through a third water inlet peristaltic pump (4.4); the third water outlet (2.3) of the alkalinity regulating tank (2) is connected to the second water inlet (3.2) of the acidophilic short-range nitrification sequencing batch reactor (3) through a second water inlet peristaltic pump (3.1), and air is supplied through an air compressor (3.3), a gas flow meter (3.4) and aeration sand. The head (3.5) enters the acidophilic short-range nitrification sequencing batch reactor (3), and the fourth water outlet (3.8) is connected to the third water inlet (4.1) of the intermediate water tank (4) through the first water outlet peristaltic pump (3.9); the fifth water outlet (4.3) of the intermediate water tank (4) is connected to the sixth water inlet (5.2) of the anaerobic ammonia oxidation sequencing batch reactor (5) through the fourth water inlet peristaltic pump (5.1); the sixth water outlet (5.5) of the anaerobic ammonia oxidation sequencing batch reactor (5) is connected to the seventh water inlet (6.1) of the outlet water tank (6) through the second water outlet peristaltic pump (5.6).

[0010] The method for achieving wastewater denitrification by acidophilic short-range nitrification / anaerobic ammonium oxidation using the device is characterized by comprising the following steps:

[0011] 1) Inoculate the acidophilic short-cut nitrification sequencing batch reactor with short-cut nitrification sludge, and control the volatile suspended solids concentration of the mixed liquor in the reactor to 3000-3500 mg / L after inoculation; inoculate the anaerobic ammonium oxidation sequencing batch reactor with anaerobic ammonium oxidation sludge, and control the volatile suspended solids concentration of the mixed liquor in the reactor to 2500-2700 mg / L after inoculation.

[0012] 2) 80% of the volume of domestic sewage in the raw water tank is pumped into the alkalinity regulating tank through the first water inlet peristaltic pump to adjust the sewage alkalinity (calculated as CaCO3) and NH4 + The molar ratio is adjusted to 0.7-0.75; the remaining 20% volume of domestic sewage in the raw water tank is pumped into the intermediate water tank through the third water inlet peristaltic pump, and subsequently used to mix the acidophilic short-range nitrification effluent.

[0013] 3) The domestic sewage in the alkalinity regulating tank is pumped into the acidophilic short-range nitrification sequencing batch reactor through the second water inlet peristaltic pump, and the first agitator and air compressor are turned on to carry out the acidophilic short-range nitrification reaction. The pH is monitored by the pH / DO online monitoring device, and the dissolved oxygen concentration of the reactor is controlled to 0.5-1.0 mg / L. The acidophilic short-range nitrification process consumes alkalinity and causes the pH to drop. When the pH stops dropping for 5 minutes, the first agitator and air compressor are turned off through the automatic control system to stop the acidophilic short-range nitrification reaction. After 20 minutes of precipitation, the acidic supernatant with a pH of less than 7 is discharged to the intermediate water tank at a drainage ratio of 40% through the first water outlet peristaltic pump to mix with the original domestic sewage to obtain NH4 + and NO2 - Neutral sewage with a mass concentration ratio of 1:1-1:1.32.

[0014] 4) The neutral wastewater in the intermediate water tank is pumped into the ANAMMOX sequencing batch reactor via the fourth inlet peristaltic pump. The second agitator is activated to initiate the ANAMMOX denitrification process. The alkalinity generated during the ANAMMOX reaction causes a pH increase. This pH change is monitored in real time using an online pH monitoring device. When the pH stops rising, the second agitator is automatically shut down via the control system. After 20 minutes of settling, the second outlet peristaltic pump discharges 50% of the supernatant into the outlet tank.

[0015] The volume ratio of the sewage diversion in step 2 is based on the NH4 + and NO2 - The concentration ratio and the pH value of the effluent are determined. The pH value of the sewage after mixing in the intermediate water tank should be maintained at 6.8-8.5. + With NO2 - The mass concentration ratio should be 1:1-1:1.32.

[0016] The device and method for achieving wastewater denitrification by acidophilic short-range nitrification / anaerobic ammonium oxidation belongs to the technical field of biological denitrification of domestic sewage. 80% of the volume of domestic sewage in the raw water tank enters the alkalinity regulating tank to adjust the alkalinity (calculated as CaCO3) and NH4 + The molar ratio is adjusted to 0.7-0.75, and the remaining 20% of the domestic sewage in the raw water tank enters the intermediate water tank; the domestic sewage after adjusting the alkalinity enters the acidophilic short-range nitrification sequencing batch reactor, and the acidophilic ammonia oxidizing bacteria converts 70% NH4 + Oxidized to NO2 - At the same time, the alkalinity is consumed to cause the effluent pH to be less than 7, effectively inhibiting different nitrite nitrogen oxidizing bacteria and achieving NO2 - Stable accumulation of NO2 - The acidic effluent is discharged into the intermediate water tank and mixed with domestic sewage to obtain NH4 + and NO2- Neutral sewage with a mass concentration ratio of 1:1-1:1.32 enters the anaerobic ammonium oxidation sequencing batch reactor; anaerobic ammonium oxidizing bacteria simultaneously remove NH4 at a ratio close to 1:1 + and NO2 - The heterotrophic denitrifying bacteria coexisting in the system use the carbon source in the domestic sewage to metabolize the NO3 produced by anaerobic ammonia oxidation - The present invention utilizes acidophilic short-range nitrification to effectively break through the technical bottleneck of highly overlapping ecological niches of traditional ammonia oxidizing bacteria and nitrite nitrogen oxidizing bacteria, realizes the coupling of acidophilic short-range nitrification and anaerobic ammonium oxidation, and solves the problem of NO3 in anaerobic ammonium oxidation effluent without adding an external carbon source. - To solve the problem of high nitrogen content, deep denitrification treatment of domestic sewage was completed.

[0017] The device and method for achieving wastewater denitrification by acidophilic short-range nitrification / anaerobic ammonium oxidation according to the present invention have the following advantages:

[0018] 1) By combining acidophilic short-range nitrification with anaerobic ammonium oxidation reactions to denitrify domestic sewage, no carbon source needs to be added and a large amount of aeration energy consumption is saved. At the same time, N2O emissions and sludge production are significantly reduced, truly realizing a green, low-carbon and sustainable sewage denitrification process.

[0019] 2) Through water distribution, while retaining the advantage of acidophilic short-range nitrification in stably inhibiting NOB, it effectively solves the problem of acidic environment inhibiting anaerobic ammonium oxidation, breaking through the bottleneck of combining acidophilic short-range nitrification with anaerobic ammonium oxidation.

[0020] 3) Influent distribution can not only neutralize the acidic effluent, but also introduce some carbon sources to supply the heterotrophic denitrifying bacteria coexisting in the system to further remove NO3 produced by anaerobic ammonium oxidation metabolism. - , effectively improve the nitrogen removal rate and achieve deep denitrification.

[0021] 4) The reaction time of acidophilic short-range nitrification and anaerobic ammonium oxidation is controlled by automatic control system, pH / DO online monitoring device and pH online monitoring device. On the one hand, it prevents the growth of NOB caused by over-aeration, and on the other hand, it avoids energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the device of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] An acidophilic short-cut nitrification / anaerobic ammonium oxidation device for achieving wastewater denitrification is characterized by comprising a raw water tank (1), an alkalinity regulating tank (2), an acidophilic short-cut nitrification sequencing batch reactor (3), an intermediate water tank (4), an anaerobic ammonium oxidation sequencing batch reactor (5), an outlet water tank (6), and an automatic control system (7);

[0025] The raw water tank (1) is provided with a first water outlet (1.1) and a second water outlet (1.2); the alkalinity regulating tank (2) is provided with a first water inlet peristaltic pump (2.1), a first water inlet (2.2), and a third water outlet (2.3); the acidophilic short-range nitrification sequencing batch reactor (3) is provided with a second water inlet peristaltic pump (3.1), a second water inlet (3.2), an air compressor (3.3), a gas flow meter (3.4), an aeration sand head (3.5), a first stirrer (3.6), a pH / DO online monitoring device (3.7), and a fourth water outlet (3.8), a first water outlet peristaltic pump (3.9); the intermediate water tank (4) is provided with a third water inlet (4.1), a fourth water inlet (4.2), a fifth water outlet (4.3), and a third water inlet peristaltic pump (4.4); the anaerobic ammonia oxidation sequencing batch reactor (5) is provided with a fourth water inlet peristaltic pump (5.1), a sixth water inlet (5.2), a second agitator (5.3), a pH online monitoring device (5.4), a sixth water outlet (5.5), and a second water outlet peristaltic pump (5.6); the water outlet tank (6) is provided with a seventh water inlet (6.1);

[0026] The first water outlet (1.1) of the raw water tank (1) is connected to the first water inlet (2.2) of the alkalinity regulating tank (2) through a first water inlet peristaltic pump (2.1), and the second water outlet (1.2) is connected to the fourth water inlet (4.2) of the intermediate water tank (4) through a third water inlet peristaltic pump (4.4); the third water outlet (2.3) of the alkalinity regulating tank (2) is connected to the second water inlet (3.2) of the acidophilic short-range nitrification sequencing batch reactor (3) through a second water inlet peristaltic pump (3.1), and air is supplied through an air compressor (3.3), a gas flow meter (3.4) and aeration sand. The head (3.5) enters the acidophilic short-range nitrification sequencing batch reactor (3), and the fourth water outlet (3.8) is connected to the third water inlet (4.1) of the intermediate water tank (4) through the first water outlet peristaltic pump (3.9); the fifth water outlet (4.3) of the intermediate water tank (4) is connected to the sixth water inlet (5.2) of the anaerobic ammonia oxidation sequencing batch reactor (5) through the fourth water inlet peristaltic pump (5.1); the sixth water outlet (5.5) of the anaerobic ammonia oxidation sequencing batch reactor (5) is connected to the seventh water inlet (6.1) of the outlet water tank (6) through the second water outlet peristaltic pump (5.6).

[0027] The specific experimental water in this example is actual domestic sewage, and its NH4 +-N average concentration is 76.4mg / L, COD average concentration is 296.1mg / L, alkalinity average concentration is 583mg / L (calculated as CaCO3), and does not contain NO2 - -N and NO3 - The reactors consisted of two sequencing batch reactors (SBRs). The effective working volume of the acidophilic shortcut nitrification reactor and the anaerobic ammonium oxidation reactor was 5 L. The anaerobic ammonium oxidation reactor was topped with a rubber cap to isolate it from air. The drainage ratio of the acidophilic shortcut nitrification reactor was 40%, and the drainage ratio of the anaerobic ammonium oxidation reactor was 50%.

[0028] The specific operation process is as follows:

[0029] 1) Inoculate the acidophilic short-cut nitrification sequencing batch reactor with short-cut nitrification sludge, and control the volatile suspended solids concentration of the mixed liquor in the reactor to 3000-3500 mg / L after inoculation; inoculate the anaerobic ammonium oxidation sequencing batch reactor with anaerobic ammonium oxidation sludge, and control the volatile suspended solids concentration of the mixed liquor in the reactor to 2500-2700 mg / L after inoculation.

[0030] 2) 80% of the volume of domestic sewage in the raw water tank is pumped into the alkalinity regulating tank through the first water inlet peristaltic pump to adjust the sewage alkalinity (calculated as CaCO3) and NH4 + The molar ratio is adjusted to 0.7-0.75; the remaining 20% volume of domestic sewage in the raw water tank is pumped into the intermediate water tank through the third water inlet peristaltic pump, and subsequently used to mix the acidophilic short-range nitrification effluent.

[0031] 3) The domestic sewage in the alkalinity regulating tank is pumped into the acidophilic short-range nitrification sequencing batch reactor through the second water inlet peristaltic pump, and the first agitator and air compressor are turned on to carry out the acidophilic short-range nitrification reaction. The pH is monitored by the pH / DO online monitoring device, and the dissolved oxygen concentration of the reactor is controlled to 0.5-1.0 mg / L. The acidophilic short-range nitrification process consumes alkalinity and causes the pH to drop. When the pH stops dropping for 5 minutes, the first agitator and air compressor are turned off through the automatic control system to stop the acidophilic short-range nitrification reaction. After 20 minutes of precipitation, the acidic supernatant with a pH of less than 7 is discharged to the intermediate water tank at a drainage ratio of 40% through the first water outlet peristaltic pump to mix with the original domestic sewage to obtain NH4 + and NO2 - Neutral sewage with a mass concentration ratio of 1:1-1:1.32.

[0032] 4) The neutral wastewater in the intermediate water tank is pumped into the ANAMMOX sequencing batch reactor via the fourth inlet peristaltic pump. The second agitator is activated to initiate the ANAMMOX denitrification process. The alkalinity generated during the ANAMMOX reaction causes a pH increase. This pH change is monitored in real time using an online pH monitoring device. When the pH stops rising, the second agitator is automatically shut down via the control system. After 20 minutes of settling, the second outlet peristaltic pump discharges 50% of the supernatant into the outlet tank.

[0033] The volume ratio of the sewage diversion in step 2 is based on the NH4 + and NO2 - The concentration ratio and the pH value of the effluent are determined. The pH value of the sewage after mixing in the intermediate water tank should be maintained at 6.8-8.5. + With NO2 - The mass concentration ratio should be 1:1-1:1.32.

[0034] The results of continuous experiments show that:

[0035] The process was operated under the condition that the average concentrations of ammonia nitrogen, total nitrogen and COD in the influent were 76.4 mg / L, 77 mg / L and 296.1 mg / L respectively. The nitrite nitrogen accumulation rate (NAR) in the effluent of the acidophilic short-cut nitrification reactor was greater than 90%. The results of the active batch experiment showed that NOB was stably inhibited and the NOB activity was maintained at 0.1-0.2 mgN / gVSS / h. The total nitrogen removal rate of the system can reach 93.8%. The average concentration of total nitrogen in the effluent was 4.8 mg / L, and the effluent NH4 + The average concentration is 2.7 mg / L, meeting the Level A standard of the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" (GB18918-2002).

Claims

1. A device for achieving wastewater denitrification by acidophilic short-range nitrification / anaerobic ammonium oxidation, characterized in that: It includes a raw water tank (1), an alkalinity regulating tank (2), an acidophilic short-range nitrification sequencing batch reactor (3), an intermediate water tank (4), an anaerobic ammonium oxidation sequencing batch reactor (5), an outlet water tank (6), and an automatic control system (7); The raw water tank (1) is provided with a first water outlet (1.1) and a second water outlet (1.2); the alkalinity regulating tank (2) is provided with a first water inlet peristaltic pump (2.1), a first water inlet (2.2), and a third water outlet (2.3); the acidophilic short-range nitrification sequencing batch reactor (3) is provided with a second water inlet peristaltic pump (3.1), a second water inlet (3.2), an air compressor (3.3), a gas flow meter (3.4), an aeration sand head (3.5), a first stirrer (3.6), a pH / DO online monitoring device (3.7), and a fourth water outlet (3.8), a first water outlet peristaltic pump (3.9); the intermediate water tank (4) is provided with a third water inlet (4.1), a fourth water inlet (4.2), a fifth water outlet (4.3), and a third water inlet peristaltic pump (4.4); the anaerobic ammonia oxidation sequencing batch reactor (5) is provided with a fourth water inlet peristaltic pump (5.1), a sixth water inlet (5.2), a second agitator (5.3), a pH online monitoring device (5.4), a sixth water outlet (5.5), and a second water outlet peristaltic pump (5.6); the water outlet tank (6) is provided with a seventh water inlet (6.1); The first water outlet (1.1) of the raw water tank (1) is connected to the first water inlet (2.2) of the alkalinity regulating tank (2) through a first water inlet peristaltic pump (2.1), and the second water outlet (1.2) is connected to the fourth water inlet (4.2) of the intermediate water tank (4) through a third water inlet peristaltic pump (4.4); the third water outlet (2.3) of the alkalinity regulating tank (2) is connected to the second water inlet (3.2) of the acidophilic short-range nitrification sequencing batch reactor (3) through a second water inlet peristaltic pump (3.1), and air is supplied through an air compressor (3.3), a gas flow meter (3.4) and aeration sand. The head (3.5) enters the acidophilic short-range nitrification sequencing batch reactor (3), and the fourth water outlet (3.8) is connected to the third water inlet (4.1) of the intermediate water tank (4) through the first water outlet peristaltic pump (3.9); the fifth water outlet (4.3) of the intermediate water tank (4) is connected to the sixth water inlet (5.2) of the anaerobic ammonia oxidation sequencing batch reactor (5) through the fourth water inlet peristaltic pump (5.1); the sixth water outlet (5.5) of the anaerobic ammonia oxidation sequencing batch reactor (5) is connected to the seventh water inlet (6.1) of the outlet water tank (6) through the second water outlet peristaltic pump (5.6).

2. A method for denitrifying wastewater using the device as claimed in claim 1, characterized in that: The following processes are included: 1) Inoculating the acidophilic shortcut nitrification sequencing batch reactor with shortcut nitrification sludge, and controlling the volatile suspended solids concentration of the mixed liquor in the reactor after inoculation to be 3000-3500 mg / L; inoculating the anaerobic ammonium oxidation sequencing batch reactor with anaerobic ammonium oxidation sludge, and controlling the volatile suspended solids concentration of the mixed liquor in the reactor after inoculation to be 2500-2700 mg / L; 2) 80% of the volume of domestic sewage in the raw water tank is pumped into the alkalinity adjustment tank through the first water inlet peristaltic pump, and the alkalinity of the sewage is adjusted to CaCO3 and NH4 + The molar ratio is 0.7-0.75; the remaining 20% volume of domestic sewage in the raw water tank is pumped into the intermediate water tank through the third water inlet peristaltic pump, and is subsequently used to mix the acidophilic short-range nitrification effluent; 3) Pumping the domestic sewage in the alkalinity adjustment tank into the acidophilic short-range nitrification sequencing batch reactor via a second water inlet peristaltic pump, turning on the first agitator and the air compressor to carry out the acidophilic short-range nitrification reaction, monitoring the pH via a pH / DO online monitoring device, and controlling the dissolved oxygen concentration in the reactor to be 0.5-1.0 mg / L; the acidophilic short-range nitrification process consumes alkalinity and causes the pH to decrease. When the pH stops decreasing for 5 minutes, the first agitator and the air compressor are turned off via the automatic control system to stop the acidophilic short-range nitrification reaction; After settling for 20 minutes, the acidic supernatant with pH < 7 is discharged to the intermediate water tank at a drainage ratio of 40% through the first outlet peristaltic pump to mix with the original domestic sewage to obtain NH4 + and NO2 - Neutral sewage with a mass concentration ratio of 1:1-1:1.32; 4) The neutral wastewater in the intermediate water tank is pumped into the anaerobic ammonium oxidation sequencing batch reactor via the fourth water inlet peristaltic pump; the second agitator is turned on to carry out the anaerobic ammonium oxidation denitrification process; alkalinity is generated during the anaerobic ammonium oxidation reaction, causing the pH to rise, and the pH change during the anaerobic ammonium oxidation process is monitored in real time by a pH online monitoring device. When the pH stops rising, the second agitator is turned off by the automatic control system; after settling for 20 minutes, the second water outlet peristaltic pump discharges 50% of the supernatant into the water outlet bucket; The volume ratio of the sewage diversion in step 2) is based on the NH4 + and NO2 - The mass concentration ratio and the pH value of the effluent are determined. The pH value of the sewage after mixing in the intermediate water tank should be maintained at 6.8-8.

5. + With NO2 - The mass concentration ratio should be 1:1-1:1.32.

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