A device and method for rapidly improving deep denitrification of high ammonia-nitrogen wastewater based on PNA continuous flow IFAS process

Abstract

A device and method for rapidly improving the deep denitrification of high ammonia nitrogen wastewater based on a PNA continuous flow IFAS process belongs to the field of biological denitrification of high ammonia nitrogen wastewater with low C / N ratio. The device includes a raw water tank, an IFAS reactor, an MBR (Medium-Range Bioreactor), and a sedimentation tank; the raw water tank and IFAS reactor are sequentially connected to the sedimentation tank and MBR at different stages. The method includes the following steps: In the stable operation stage, the IFAS reactor is fed with water, and low-oxygen aeration is performed, with effluent from the sedimentation tank. In the fluctuating operation stage, the IFAS reactor is continuously fed with water, and the sedimentation tank is replaced with the MBR, with the effluent from the sedimentation tank becoming membrane effluent. In the new steady-state stage, the IFAS reactor is continuously fed with water, and the MBR is replaced back with the sedimentation tank, with the effluent from the membrane reverting to gravity sedimentation. This invention is applicable to the deep denitrification process of high ammonia nitrogen wastewater generated from landfill leachate based on short-cut nitrification coupled with anaerobic ammonia oxidation, effectively enriching anaerobic ammonia oxidizing bacteria. The device is simple and has significant energy-saving and consumption-reducing advantages.

Description

Technical Field

[0001] This invention relates to an apparatus and method for deep denitrification of high ammonia nitrogen wastewater based on continuous flow low-oxygen aeration with PNA. It belongs to the field of biological denitrification technology for low carbon-to-nitrogen ratio high ammonia nitrogen wastewater and is applicable to the biological denitrification process of high ammonia nitrogen wastewater generated by chemical industry and landfill leachate. Background Technology

[0002] In recent years, the environmental hazards posed by landfill leachate from municipal solid waste, kitchen waste biogas slurry, and high-ammonia nitrogen wastewater from the chemical industry have been enormous. High-ammonia nitrogen wastewater is characterized by numerous ammonia nitrogen pollution sources, large discharge volumes, and gradually increasing concentrations, making its efficient treatment one of the unsolved challenges internationally. Using a single treatment technology is often insufficient for cost-effective treatment of high-ammonia nitrogen wastewater, necessitating the combined use of processes with different characteristics. However, high-ammonia nitrogen wastewater generally has low levels of biodegradable organic matter, and the severe lack of organic carbon sources is a significant barrier to improving denitrification efficiency. Adding external organic carbon sources would substantially increase the cost of denitrification. Therefore, more effective and economical denitrification devices and methods are needed.

[0003] In practice, current high-ammonia nitrogen wastewater denitrification processes still rely on full-process nitrification and denitrification technologies. This involves first oxidizing ammonia nitrogen to nitrate nitrogen under aerobic conditions, and then reducing the nitrate nitrogen back to nitrogen gas under anoxic conditions for removal from the wastewater. However, with increasingly stringent wastewater discharge standards and rising wastewater treatment demands, traditional nitrification and denitrification processes often fall short of these requirements. Continuing to use traditional full-process nitrification and denitrification processes not only results in high aeration energy consumption but also significantly increases the amount of external carbon source required, making it uneconomical and inconsistent with the treatment process for high-ammonia nitrogen wastewater aimed at carbon neutrality and development.

[0004] However, the discovery of anammox bacteria (ANAMMOX) offers a novel nitrogen removal process. In anammox nitrogen removal technology, because these bacteria are autotrophic, carbonates or carbon dioxide serve as their inorganic carbon source for growth. Therefore, the oxidation of ammonia nitrogen does not require molecular oxygen, and the reduction of nitrite nitrogen also does not require an organic carbon source. This significantly reduces the operating costs of biological nitrogen removal for high-ammonia-nitrogen wastewater. Based on anammox technology, wastewater treatment plant operating costs can be reduced without the addition of any chemicals, while achieving highly efficient nitrogen removal. For high-ammonia-nitrogen wastewater with a low C / N ratio and high ammonia nitrogen content, anammox nitrogen removal technology is the optimal choice for nitrogen removal and is the most suitable process for its water quality characteristics.

[0005] The short-cut nitrification coupled with anammox integrated process is one of the most energy-efficient wastewater denitrification processes currently available, and it has achieved good treatment results in actual wastewater treatment plants. However, anammox bacteria are chemoautotrophic bacteria with harsh growth conditions, a doubling time of 10-14 days, low growth efficiency, and slow accumulation rate. Therefore, how to enable anammox bacteria to remain in the reactor for a longer period of time to complete efficient accumulation and improve the anammox reaction effect is crucial for the promotion of the PNA process.

[0006] Biofilm methods, through biological carriers, enhance microbial retention and extend the residence time of functional bacteria, making them more suitable for anaerobic ammonia oxidation (ANAMO) technology in treating high-ammonia nitrogen wastewater. Numerous biofilm processes have been developed to address the retention of ANAMMOX. The IFAS-PNA process, combining a fixed biofilm-activated sludge reactor with a short-cut nitrification coupled with ANAMMOX, is a promising option. It can enrich ANAMMOX and AOB in the biofilm and suspended sludge respectively, achieving excellent denitrification through the synergistic effect between the suspended sludge and biofilm. Suspended sludge carries a large number of microorganisms, and the addition of packing material promotes biofilm formation, allowing attached microorganisms to generate more biomass within a limited space. How to increase the retention of anaerobic ammonia oxidizing bacteria within the system, achieve rapid enrichment of ANAMMOX, and improve denitrification capacity is a pressing issue that needs to be addressed. Summary of the Invention

[0007] The purpose of this invention is to solve the aforementioned technical problems by proposing a device and method for deep denitrification of high ammonia nitrogen wastewater based on continuous flow low-oxygen aeration using PNA (Polyoxaloacetic Acid) technology. In the initial stable operation phase, suspended sludge is inoculated and continuously fed into an integrated short-cut nitrification coupled anaerobic ammonia oxidation (IFAS) reactor. A perforated plexiglass plate is used to mount biological packing material, on which anaerobic ammonia oxidizing bacteria attach and grow. An aerobic biofilm forms within the layered structure of the biological packing material, providing excellent protection for the anaerobic ammonia oxidizing bacteria inside the packing material, while also increasing the retention time and enhancing their growth and accumulation. Successful startup and stable operation are achieved. However, further increases in influent ammonia nitrogen will lead to nitrite accumulation, indicating that the denitrification capacity of the integrated short-cut nitrification coupled anaerobic ammonia oxidation (IFAS) reactor cannot be further improved.

[0008] The role of suspended sludge in sludge-film hybrid systems is receiving increasing attention. During fluctuating operation, suspended sludge is retained by the MBR (Mechanical Bioreactor), and the effluent treatment changes from gravity sedimentation to membrane effluent. This increases the suspended sludge concentration in the main reaction zone, providing favorable conditions for the growth and enrichment of anaerobic ammonia-oxidizing bacteria. The purpose of using an MBR is to induce fluctuations in suspended sludge concentration, thereby influencing changes in the microbial community structure of the biofilm from a macroscopic environmental perspective. In the new steady-state phase, the MBR is replaced with a sedimentation tank, and the membrane effluent is changed back to gravity sedimentation. Once the suspended sludge concentration returns to a stable operating state, the influent total nitrogen concentration is gradually increased, from 590.0 mg / L to 2250 mg / L during long-term operation, while the influent total nitrogen loading increases from 0.6 kg N / (m³). 3 ·d) increased to 3.2 kg N / (m 3 ·d) significantly improves the nitrogen removal capacity of the integrated short-cut nitrification coupled anaerobic ammonia oxidation (IFAS) reactor, ultimately realizing an economical and efficient device and method for autotrophic nitrogen removal from high-ammonia nitrogen wastewater.

[0009] The objective of this invention is achieved through the following technical solution:

[0010] A device for rapidly improving the deep denitrification of high ammonia nitrogen wastewater based on PNA continuous flow IFAS process is characterized by comprising a raw water tank (1), an integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2), an MBR (5), and a sedimentation tank (4). The raw water tank (1) is equipped with a first temperature control heating device (6) in the middle. The raw water tank (1) is connected to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) through a first inlet pipe (7), a first inlet control valve (8), and a first peristaltic pump (9), and flows through the second compartment (13) through the first hole (33) until it flows out from the fourth compartment (15). The packing material used in the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is cubic polyurethane packing material (16). The cubic polyurethane packing material (16) is fixed with an organic glass perforated plate (35) and placed in the main reaction zone (36) in the direction of water flow. The main reaction zone (36) is equipped with a second temperature control heating device (10). In the first stage, the effluent of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is connected to the sedimentation tank (4) through the first effluent pipe (18), the first drainage control valve (29), the sedimentation tank inlet pipe (39), and the sedimentation tank (4). The supernatant after sedimentation is discharged through the second effluent pipe (31). The sludge in the sedimentation tank (4) is returned to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) through the sludge return pipe (25), the second inlet control valve (22), and the sludge return pump (23). In stage two, the first effluent pipe (18) is separated from the sedimentation tank inlet pipe (39), and the first effluent pipe (18) is connected to the MBR inlet pipe (41). The sludge return pipe (25) is disconnected from the sedimentation tank sludge return outlet (40) and connected to the MBR sludge return pipe (42). The sludge in the MBR (5) is returned to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) through the sludge return pipe (25) and the sludge return pump (23). The MBR (5) discharges the treated waste liquid through the third effluent pipe (30), the second drainage control valve (3), and the second peristaltic pump (37). In stage three, the effluent from the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is reconnected to the sedimentation tank inlet pipe (39) through the first effluent pipe (18) and connected to the sedimentation tank (4). The supernatant after sedimentation is discharged through the second effluent pipe (31). The sludge in the sedimentation tank (4) is returned to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) through the sludge return pipe (25) and the sludge return pump (23).

[0011] The integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) has four sampling and monitoring valves from left to right at the bottom. The first inlet pipe (7) is equipped with a first inlet control valve (8) and a first peristaltic pump (9). The first outlet pipe is equipped with a first drain control valve (29). The integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is divided into a first compartment (11), a second compartment (13), a third compartment (14) and a fourth compartment (15). The first to fourth compartments are in a low-oxygen aeration state. The reactor also includes a mechanical stirrer (12), a real-time pH and DO monitoring device (17), a pH probe (19), a DO probe (20), a cubic polyurethane packing (16), and an organic glass perforated plate (35). A microporous aeration disc (28) is provided at the bottom of the short-integrated short-range nitrification coupled anaerobic ammonium oxidation IFAS reactor (2). An aeration pump (21) is connected to the microporous aeration disc (28) through an aeration pipe (24). A gas flow meter (27) is provided on the aeration pipe (24).

[0012] A method for rapidly improving the deep denitrification of high ammonia nitrogen wastewater based on the PNA continuous flow IFAS process is characterized by the following steps:

[0013] Stable operation phase: Suspended sludge from the pilot anaerobic ammonium oxidation reactor of the wastewater treatment plant was inoculated into the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) to achieve an MLSS of 3000.0–4000.0 mg / L; the sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) was 200%; the test influent was prepared by adding NH4HCO3 (2.82 g / L) and NaHCO3 (0.82 g / L) and trace elements (EDTA·2Na (0.80 mg) and FeSO4·7H2O per 100 L of water) to the reactor. 2O (1.14 mg), MgSO4·7H2O (0.03 mg), CaCl2·2H2O (0.01 mg), and KH2PO4 (0.01 mg) were injected into the raw water tank (1) as the raw solution. The temperature of the raw water tank (1) was controlled at 30°C by the first temperature control device (6). The first inlet control valve (8) was opened, and the high ammonia nitrogen wastewater was pumped into the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) through the first inlet pipe (7) and the first peristaltic pump (9). The total inorganic nitrogen concentration of the influent was 550.0 ± 100 mg / L, and the total nitrogen load of the influent was 0.9~1.4 kg N / (m³). 3·d); The pH in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 6.8 to 7.5; the dissolved oxygen (DO) in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 0.01 to 0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 12 h; the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is connected in series with the sedimentation tank (4) to achieve gravity sedimentation effluent; under the above conditions, when the ratio of nitrite to ammonia nitrogen in the effluent of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 1.1 to 1.3 and can be maintained for more than 30 days, the integrated short-cut nitrification coupled anaerobic ammonia oxidation process is successfully started and operates stably;

[0014] Fluctuation operation phase: The sedimentation tank (4) is replaced with the MBR (5), the first effluent pipe (18) is separated from the sedimentation tank influent pipe (39), and the first effluent pipe (18) is connected to the MBR influent pipe (41). That is, the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) and the MBR (5) are operated in series. The suspended biomass is effectively retained by the MBR (5), and the MLSS is 4000.0~6000.0mg / L. The sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 200%. The total inorganic nitrogen concentration in the influent is 548.0±120mg / L, and the total nitrogen load in the influent is 0.7~1.6kg N / (m 3 •d); The pH in the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 6.5 to 7.8; the dissolved oxygen (DO) in the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 0.01 to 0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 12 h; under the above conditions, the suspended sludge concentration in the main reaction zone of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) reaches 6000.0 to 7000.0 mg / L, that is, the suspended sludge is effectively enriched.

[0015] New steady-state stage: The MBR (5) is replaced with a sedimentation tank (4), the first effluent pipe (18) is separated from the MBR influent pipe (41), and the first effluent pipe (18) is reconnected to the sedimentation tank influent pipe (39), thus connecting to the sedimentation tank (4). That is, the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) and the sedimentation tank (4) are connected in series. A large amount of suspended sludge is lost in the main reaction zone (36), and the MLSS is 3000.0~4000.0mg / L; the sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 200%; the total inorganic nitrogen concentration in the influent increases from 590.0mg / L to 2250mg / L, and the total nitrogen load in the influent increases from 0.6kg N / (m 3 ·d) increased to 3.2 kg N / (m 3 •d); The pH in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 6.8 to 7.9; the dissolved oxygen (DO) in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 0.01 to 0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 12 h; operating under the above conditions will increase the abundance of anaerobic ammonia oxidizing bacteria in the biofilm of the main reaction zone of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2).

[0016]

[0017] Invention Advantages

[0018] The apparatus and method for rapidly improving the deep denitrification of high ammonia nitrogen wastewater based on the PNA continuous flow IFAS process disclosed in this invention have the following innovative features compared with the prior art:

[0019] 1) By using different effluent methods and macroscopic dynamic control, the state of the microbial community can be effectively changed, and anaerobic ammonia-oxidizing bacteria can be effectively retained in the membrane effluent stage, reducing the addition of external carbon sources, improving autotrophic denitrification performance, and saving costs.

[0020] 2) The process is simple and the operation is flexible, providing a large tolerance for errors in actual engineering operations;

[0021] 3) Short-term use of MBR effectively preserves flocs as the initial carriers of floc aggregates and permanently alters the microbial community structure in the PN / A system, making it more stable and providing a favorable environment for the enrichment of anaerobic ammonia oxidizing bacteria, thus achieving anaerobic ammonia oxidation, which is easy to control.

[0022] 4) By monitoring temperature, pH, and dissolved oxygen (DO) online, the progress of nitrification and anaerobic ammonium oxidation can be controlled. Process control methods are used to control the microaerobic aeration time in real time, thereby achieving precise control and energy savings.

[0023] 5) Once this method is mature and operational, it can directly treat high ammonia nitrogen wastewater without dilution, making operation and management convenient. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the system structure.

[0025] The numbers in the diagram represent the following devices: 1-Raw water tank; 2-Integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor; 3-Second drainage control valve; 4-Sedimentation tank; 5-MBR; 6-First temperature control heating device; 7-First inlet pipe; 8-First inlet control valve; 9-First peristaltic pump; 10-Second temperature control heating device; 11-First compartment; 12-Mechanical stirrer; 13-Second compartment; 14-Third compartment; 15-Fourth compartment; 16-Cube polyurethane packing; 17-pH and DO real-time monitoring device; 18-First outlet pipe; 19-pH probe; 20-DO probe. 21-Aeration pump; 22-Second inlet control valve; 23-Sludge return pump; 24-Aeration pipe; 25-Sludge return pipe; 26-Sampling valve; 27-Gas flow meter; 28-Microporous aeration disc; 29-First drain control valve; 30-Third outlet pipe; 31-Second outlet pipe; 32-First hole; 33-Second hole; 34-Third hole; 35-Organic glass perforated plate; 36-Main reaction zone; 37-Second peristaltic pump; 38-Flat sheet membrane; 39-Sedimentation tank inlet; 40-Sedimentation tank sludge return outlet; 41-MBR inlet pipe; 42-MBR sludge return pipe; Detailed Implementation

[0026] The ammonia removal system and operating method involved in this invention will be further described below with reference to the accompanying drawings:

[0027] The device includes a raw water tank (1), an integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2), an MBR (5), and a sedimentation tank (4). The raw water tank (1) is equipped with a first temperature control heating device (6) in the middle. The raw water tank (1) is connected to the first chamber (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) through a first inlet pipe (7), a first inlet control valve (8), and a first peristaltic pump (9), and flows through the second chamber (13) through the first hole (33) until it flows out from the fourth chamber (15). The packing material used in the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is cubic polyurethane packing material (16). The cubic polyurethane packing material (16) is fixed with an organic glass perforated plate (35) and placed in the main reaction zone (36) in the direction of water flow. The main reaction zone (36) is equipped with a second temperature control heating device (10). In Phase 1, the effluent from the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is connected to the sedimentation tank (4) via the first effluent pipe (18), the first drainage control valve (29), the sedimentation tank inlet pipe (39), and the sedimentation tank (4). The supernatant after sedimentation is discharged through the second effluent pipe (31). The sludge in the sedimentation tank (4) is discharged through the sludge return pipe (25), the second inlet control valve (22), and the sludge return pump (23).

[0028] The sludge is returned to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2). In stage two, the first effluent pipe (18) is separated from the sedimentation tank inlet pipe (39), and the first effluent pipe (18) is connected to the MBR inlet pipe (41). The sludge return pipe (25) is disconnected from the sedimentation tank sludge return outlet (40) and connected to the MBR sludge return pipe (42). The sludge in the MBR (5) is returned to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) through the sludge return pipe (25) and the sludge return pump (23). The treated waste liquid of the MBR (5) is discharged through the third effluent pipe (30), the second drainage control valve (3), and the second peristaltic pump (37). In stage three, the effluent from the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is reconnected to the sedimentation tank inlet pipe (39) via the first effluent pipe (18), thus connecting to the sedimentation tank (4). The supernatant after sedimentation is discharged through the second effluent pipe (31). The sludge in the sedimentation tank (4) is returned to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) via the sludge return pipe (25) and the sludge return pump (23).

[0029] The integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) has four sampling and monitoring valves from left to right at the bottom. The first inlet pipe (7) is equipped with a first inlet control valve (8) and a first peristaltic pump (9). The first outlet pipe is equipped with a first drain control valve (29). The integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is divided into a first compartment (11), a second compartment (13), a third compartment (14) and a fourth compartment (15). The first to fourth compartments are in a low-oxygen aeration state. The reactor also includes a mechanical stirrer (12), a real-time pH and DO monitoring device (17), a pH probe (19), a DO probe (20), a cubic polyurethane packing (16), and an organic glass perforated plate (35). A microporous aeration disc (28) is provided at the bottom of the short-integrated short-range nitrification coupled anaerobic ammonium oxidation IFAS reactor (2). An aeration pump (21) is connected to the microporous aeration disc (28) through an aeration pipe (24). A gas flow meter (27) is provided on the aeration pipe (24).

[0030] High-ammonia-nitrogen wastewater was prepared using NH4HCO3, NaHCO3, and trace elements and used as the treatment target. The influent ammonia-nitrogen concentration was as high as 2250 mg / L, with no external carbon source and a low carbon-to-nitrogen ratio, making it a typical high-ammonia-nitrogen wastewater. The specific method for deep denitrification using this device is as follows:

[0031] Stable operation phase: Suspended sludge from the pilot anaerobic ammonium oxidation reactor of the wastewater treatment plant was inoculated into the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) to achieve an MLSS of 3000.0–4000.0 mg / L; the sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) was 200%; the test influent was prepared by adding NH4HCO3 (2.82 g / L) and NaHCO3 (0.82 g / L) and trace elements (EDTA·2Na (0.80 mg) and FeSO4·7H2O per 100 L of water) to the reactor. 2O (1.14 mg), MgSO4·7H2O (0.03 mg), CaCl2·2H2O (0.01 mg), and KH2PO4 (0.01 mg) were injected into the raw water tank (1) as the raw solution. The temperature of the raw water tank (1) was controlled at 30°C by the first temperature control device (6). The first inlet control valve (8) was opened, and the high ammonia nitrogen wastewater was pumped into the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) through the first inlet pipe (7) and the first peristaltic pump (9). The total inorganic nitrogen concentration of the influent was 550.0 ± 100 mg / L, and the total nitrogen load of the influent was 0.9~1.4 kg N / (m³). 3·d); The pH in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 6.8 to 7.5; the dissolved oxygen (DO) in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 0.01 to 0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 12 h; the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is connected in series with the sedimentation tank (4) to achieve gravity sedimentation effluent; under the above conditions, when the ratio of nitrite to ammonia nitrogen in the effluent of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 1.1 to 1.3 and can be maintained for more than 30 days, the integrated short-cut nitrification coupled anaerobic ammonia oxidation process is successfully started and operates stably;

[0032] Fluctuation operation phase: The sedimentation tank (4) is replaced with the MBR (5), the first effluent pipe (18) is separated from the sedimentation tank influent pipe (39), and the first effluent pipe (18) is connected to the MBR influent pipe (41). That is, the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) and the MBR (5) are operated in series. The suspended biomass is effectively retained by the MBR (5), and the MLSS is 4000.0~6000.0mg / L. The sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 200%. The total inorganic nitrogen concentration in the influent is 548.0±120mg / L, and the total nitrogen load in the influent is 0.7~1.6kg N / (m 3 •d); The pH in the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 6.5 to 7.8; the dissolved oxygen (DO) in the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 0.01 to 0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 12 h; under the above conditions, the suspended sludge concentration in the main reaction zone of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) reaches 6000.0 to 7000.0 mg / L, that is, the suspended sludge is effectively enriched.

[0033] New steady-state stage: The MBR (5) is replaced with a sedimentation tank (4), the first effluent pipe (18) is separated from the MBR influent pipe (41), and the first effluent pipe (18) is reconnected to the sedimentation tank influent pipe (39), thus connecting to the sedimentation tank (4). That is, the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) and the sedimentation tank (4) are connected in series. A large amount of suspended sludge is lost in the main reaction zone (36), and the MLSS is 3000.0~4000.0mg / L; the sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 200%; the total inorganic nitrogen concentration in the influent increases from 590.0mg / L to 2250mg / L, and the total nitrogen load in the influent increases from 0.6kg N / (m 3 ·d) increased to 3.2 kg N / (m 3 •d); The pH in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 6.8 to 7.9; the dissolved oxygen (DO) in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 0.01 to 0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 12 h; operating under the above conditions will increase the abundance of anaerobic ammonia oxidizing bacteria in the biofilm of the main reaction zone of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2).

[0034] The above is a typical embodiment of the present invention, and the implementation of the present invention is not limited thereto.

Claims

1. A method for rapidly improving the deep denitrification of high ammonia nitrogen wastewater based on PNA continuous flow IFAS process, the device used in the method includes a raw water tank (1), an integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2), an MBR (5), and a sedimentation tank (4); the raw water tank (1) is equipped with a first temperature control heating device (6) in the middle, and the raw water tank (1) is connected to the first chamber (11) of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) through a first inlet pipe (7), a first inlet control valve (8) and a first peristaltic pump (9), and flows through the second chamber (13) through the first hole (33) until it flows out from the fourth chamber (15); the packing material used in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is cubic polyurethane packing material (16), and the cubic polyurethane packing material (16) is fixed with an organic glass perforated plate (35) as a frame and placed in the direction of water flow. Main reaction zone (36); The main reaction zone (36) is equipped with a second temperature control heating device (10); In the first stage, the effluent of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is connected to the first effluent pipe (18), the first drainage control valve (29), the sedimentation tank inlet pipe (39) and the sedimentation tank (4); The supernatant after sedimentation is discharged through the second effluent pipe (31); The sludge in the sedimentation tank (4) is returned to the first compartment (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) through the sludge return pipe (25), the second inlet control valve (22) and the sludge return pump (23); In the second stage, the first effluent pipe (18) is separated from the sedimentation tank inlet pipe (39), and the first effluent pipe (18) is connected to the MBR inlet pipe (41), and the sludge return pipe (25) is disconnected from the sedimentation tank sludge return outlet (40) and connected to the MBR sludge return pipe (42). The sludge in the MBR (5) is returned to the first chamber (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) through the sludge return pipe (25) and the sludge return pump (23); the MBR (5) discharges the treated waste liquid through the third effluent pipe (30), the second drainage control valve (3) and the second peristaltic pump (37); in stage three, the effluent of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is reconnected to the sedimentation tank inlet pipe (39) through the first effluent pipe (18) and connected to the sedimentation tank (4); the supernatant after sedimentation is discharged through the second effluent pipe (31); the sludge in the sedimentation tank (4) is returned to the first chamber (11) of the integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) through the sludge return pipe (25) and the sludge return pump (23). The integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) has four sampling and monitoring valves installed from left to right at the bottom. The first inlet pipe (7) is equipped with a first inlet control valve (8) and a first peristaltic pump (9), and the first outlet pipe is equipped with a first drain control valve (29). The integrated short-cut nitrification coupled anaerobic ammonium oxidation (IFAS) reactor (2) is divided into a first compartment (11), a second compartment (13), a third compartment (14), and a fourth compartment (15). The first to fourth compartments are low-oxygen aeration chambers. The reactor is in a gaseous state and includes a mechanical stirrer (12), a real-time pH and DO monitoring device (17), a pH probe (19), a DO probe (20), a cubic polyurethane packing (16), and an organic glass perforated plate (35). At the bottom of the short-integrated short-path nitrification coupled anaerobic ammonia oxidation IFAS reactor (2), there is a microporous aeration disc (28), and the aeration pump (21) is connected to the microporous aeration disc (28) through an aeration pipe (24). A gas flow meter (27) is installed on the aeration pipe (24). Its features Includes the following steps: Stable operation phase: Suspended sludge from the pilot anaerobic ammonia oxidation reactor of the wastewater treatment plant was inoculated into the continuous flow integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) to achieve an MLSS of 3000.0–4000.0 mg / L; the sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) was 200%; the test influent was prepared by adding NH4HCO3 and NaHCO3, as well as trace elements, as raw materials and injecting them into the raw water tank (1). The final concentration of NH4HCO3 was 2.82 g / L and the final concentration of NaHCO3 was 0.82 g / L. The trace elements required per 100L of water were 0.80 mg EDTA·2Na, 1.14 mg FeSO4·7H2O, 0.03 mg MgSO4·7H2O, 0.01 mg CaCl2·2H2O, and 0.01 mg EDTA·2Na, 1.14 mg FeSO4·7H2O, 0.03 mg MgSO4·7H2O, 0.01 mg CaCl2·2H2O, and 0.01 mg MgSO4·7H2O. KH2PO4 is injected into the raw water tank (1) as the raw solution. The temperature of the raw water tank (1) is controlled at 30°C by the first temperature control device (6). The first inlet control valve (8) is opened, and the high ammonia nitrogen wastewater is pumped into the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) through the first inlet pipe (7) and the first peristaltic pump (9). The total inorganic nitrogen concentration of the influent is 550.0±100 mg / L, and the total nitrogen load of the influent is 0.9~1.4 kg N / (m³). 3 ·d); The pH inside the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 6.8~7.5; the dissolved oxygen DO in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 0.01~0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 12 h; the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is connected in series with the sedimentation tank (4) to achieve gravity sedimentation effluent; under the above conditions, when the ratio of nitrite to ammonia nitrogen in the effluent of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 1.1~1.3 and can be maintained for more than 30 days, the integrated short-cut nitrification coupled anaerobic ammonia oxidation process is successfully started and runs stably; Fluctuation operation phase: The sedimentation tank (4) is replaced with the MBR (5), the first effluent pipe (18) is separated from the sedimentation tank influent pipe (39), and the first effluent pipe (18) is connected to the MBR influent pipe (41). That is, the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) and the MBR (5) are connected in series. The suspended biomass is effectively retained by the MBR (5), and the MLSS is 4000.0~6000.0 mg / L; the sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 200%; the total inorganic nitrogen concentration in the influent is 548.0±120 mg / L, and the total nitrogen load in the influent is 0.7~1.6 kg N / (m 3 ·d); The pH inside the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 6.5~7.8; the dissolved oxygen DO in the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 0.01~0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 12 h; under the above conditions, the suspended sludge concentration in the main reaction zone of the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) reaches 6000.0~7000.0 mg / L, that is, the suspended sludge is effectively enriched; New steady-state stage: The MBR (5) is replaced with a sedimentation tank (4), the first effluent pipe (18) is separated from the MBR influent pipe (41), and the first effluent pipe (18) is reconnected to the sedimentation tank influent pipe (39), connecting to the sedimentation tank (4). That is, the integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) and the sedimentation tank (4) are connected in series. A large amount of suspended sludge is lost in the main reaction zone (36), and the MLSS is 3000.0~4000.0 mg / L. The sludge return ratio of the continuous flow integrated short-cut nitrification coupled anaerobic ammonium oxidation IFAS reactor (2) is 200%. The total inorganic nitrogen concentration in the influent increases from 590.0 mg / L to 2250 mg / L, and the total nitrogen load in the influent increases from 0.6 kg N / (m 3 ·d) increased to 3.2 kg N / (m 3 •d); The pH inside the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 6.8 to 7.9; the dissolved oxygen (DO) in the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 0.01 to 0.20 mg / L; the hydraulic retention time of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2) is 12 h; operating under the above conditions will increase the abundance of anaerobic ammonia oxidizing bacteria in the biofilm of the main reaction zone of the integrated short-cut nitrification coupled anaerobic ammonia oxidation IFAS reactor (2).

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