A one-stage EGSB anaerobic ammonium oxidation device based on MABR

Abstract

A one-stage EGSB anaerobic ammonium oxidation device based on MABR belongs to the field of sewage treatment equipment. This device couples MABR with EGSB, and through the regulation and operation of oxygen supply, it realizes the effective enrichment of AOB and the elimination of NOB, providing matrix guarantee for the effective anaerobic ammonium oxidation reaction; MABR membrane components not only meet the precise oxygen supply requirements, but also act as biological carriers, the biofilm has a large biomass, a long food chain, and AOB is not easy to lose; the AOB reaction area of ​​MABR is separated from the granular sludge anaerobic ammonium oxidation reaction area, and an online monitoring feedback system and a reflux control system are respectively set up, while meeting the optimization and control of the two reaction areas, the operation efficiency of the EGSB system is maximized; MABR membrane components have low aeration energy consumption, reducing the overall operation cost of the system; the reflux system in EGSB is flexible and changeable, which not only meets the operation requirements of the two reaction areas, but also can realize the flushing and control of the biofilm thickness of the MABR membrane components.

Description

Technical Field

[0001] The invention belongs to the field of sewage treatment equipment, and in particular relates to a one-stage EGSB anaerobic ammonia oxidation device based on MABR. Background Art

[0002] The one-stage short-cut nitrification-anaerobic ammonium oxidation process couples short-cut nitrification with anaerobic ammonium oxidation to achieve NH 4 + The simultaneous nitrite and anaerobic ammonium oxidation reactions are suitable for high NH 4 + Compared with the traditional denitrification process, the denitrification process has high denitrification efficiency and low aeration energy consumption. In addition, the denitrification process is based on the unique physiological metabolic pathway of anaerobic ammonia-oxidizing bacteria. The denitrification process does not require the participation of organic matter, so the denitrification effect is not affected by the lack of organic matter in the influent.

[0003] NH 4 + +1.5O 2 →NO 2 - +2H + +H 2 O (1-1)

[0004] NH 4 + +1.32NO 2 - +0.066HCO 3 - +0.13H + →1.02N 2 +0.26NO 3 - +0.066CH 2 O 0.5 N 0.15 +2.03H 2 O(1-2)

[0005] From the reaction principles (1-1) and (1-2), it can be seen that the rate-limiting step in the one-stage short-range nitrification-anaerobic ammonium oxidation process is short-range nitrification, which is the process by which ammonia-oxidizing bacteria (AOB) convert NH 4 + -N is converted to NO 2 --N, providing a substrate for the subsequent anaerobic ammonium oxidation reaction. Under excessive aeration conditions, nitrite-oxidizing bacteria (NOB) convert NO 2 - -N is further oxidized to NO 3 - -N is not conducive to the anaerobic ammonium oxidation reaction. How to achieve effective enrichment of AOB and elimination of NOB through precise and effective aeration control is the main technical bottleneck of the current one-stage short-range nitrification-anaerobic ammonium oxidation system.

[0006] Membrane Aerated Biofilm Reactor (MABR) uses permeable membrane materials for aeration and oxygen supply. Oxygen is transferred in the form of dissolved diffusion or microbubbles / no bubbles. At the same time, the permeable membrane has a large specific surface area, which is easy for microorganisms to attach and grow, forming a biofilm. According to the pollutant load and biofilm activity, the aeration membrane supplies oxygen to the biofilm in real time on demand. The oxygen concentration gradient in the biofilm forms a dynamic distribution, and the oxygen concentration and pollutant concentration are transferred in reverse, achieving the most accurate oxygen supply.

[0007] The expanded granular sludge bed (EGSB) reactor provides a reasonable and stable upward flow rate and flow state for the biochemical reaction zone through the optimization and regulation of the internal recirculation system. It has significant advantages in cultivating anaerobic ammonia oxidation granular sludge, biofilm formation and thickness control. At the same time, through the flexible regulation of internal recirculation parameters, the contact between the substrate and microorganisms in the wastewater is increased, the mass transfer effect between the reactants is effectively enhanced, and the biochemical reaction rate and impact resistance of the reactor are improved.

[0008] In summary, by utilizing the advantages of flow state control and substrate contact of the internal recirculation system of the EGSB reactor, the MABR capable of precise oxygen supply is coupled with it. Through the flexible control of the internal recirculation system and the precise supply of oxygen, the effective enrichment of AOB and the elimination of NOB are achieved, providing a technical reference for the efficient and stable operation of the one-stage EGSB anaerobic ammonia oxidation reactor. Summary of the invention

[0009] The purpose of the present invention is to solve the problem of treating high NH 4 + -N wastewater, it is difficult to effectively enrich AOB.

[0010] A one-stage EGSB anaerobic ammonium oxidation device based on MABR, the device diagram of the present invention is shown in the attached Figure 1 As shown, the specific features are:

[0011] A one-stage EGSB anaerobic ammonium oxidation device based on MABR comprises: a device body (1); an anaerobic ammonium oxidation granular sludge zone (1-1); a sieve plate flange (1-2); an MABR reaction zone (1-3); a three-phase separator (2); an internal reflux main valve (3); a first internal reflux valve (4); a second internal reflux valve (5); a first internal reflux flowmeter (6); a second internal reflux flowmeter (7); a second internal reflux pump (8); a third internal reflux valve (9); a third internal reflux flowmeter (10); a third internal reflux pump (11); a first internal reflux pump (12); a first perforated water distributor (1 3); second perforated water distributor (14); water inlet box (15); water inlet flowmeter (16); water inlet valve (17); water inlet pump (18); air filter (19); air inlet valve (20); aeration fan (21); air inlet flowmeter (22); MABR membrane assembly (23); tail gas oxygen concentration meter (24); tail gas valve (25); tail gas flowmeter (26); online monitoring electrode (27); online monitoring electrode (28); automatic control system (29); water outlet overflow weir (30); U-shaped water outlet (31); gas production valve (32); reactor vent valve (33);

[0012] The device body (1) is divided into an anaerobic ammonium oxidation granular sludge zone (1-1) and a MABR reaction zone (1-3) by a sieve plate flange (1-2);

[0013] The volume ratio of the anaerobic ammonium oxidation granular sludge zone (1-1) and the MABR reaction zone (1-3) is maintained between 1:1 and 3:1;

[0014] The sieve plate flange (1-2) has a pore size range of 1-3 mm and is used to intercept the biofilm detached from the surface of the MABR membrane assembly (23) and enter the anaerobic ammonium oxidation granular sludge area (1-1);

[0015] The internal reflux system of the device body (1) comprises: an internal reflux main valve (3); a first internal reflux valve (4); a second internal reflux valve (5); a first internal reflux flowmeter (6); a second internal reflux flowmeter (7); a second internal reflux pump (8); a third internal reflux valve (9); a third internal reflux flowmeter (10); a third internal reflux pump (11); a first internal reflux pump (12); a first perforated water distributor (13); a second perforated water distributor (14);

[0016] The internal return main valve (3) is sequentially connected to the first internal return valve (4); the first internal return flow meter (6); the first internal return pump (12) and the first perforated water distributor (13); the internal return main valve (3) is sequentially connected to the second internal return valve (5); the second internal return flow meter (7); the second internal return pump (8) and the second perforated water distributor (14); the first perforated water distributor (13) is arranged in the MABR reaction zone (1-3); the second perforated water distributor (14) is arranged in the anaerobic ammonium oxidation granular sludge zone (1-1);

[0017] The third internal reflux valve (9); the third internal reflux flowmeter (10); the third internal reflux pump (11) and the MABR reaction zone (1-3) form a cycle;

[0018] The tail gas system of the MABR membrane assembly (23) comprises: a tail gas oxygen concentration measuring instrument (24), a tail gas valve (25) and a tail gas flow meter (26), which are used for calculating oxygen utilization efficiency and regulating aeration parameters;

[0019] The MABR membrane assembly (23) is a hollow fiber membrane with a membrane pore size ranging from 0.01 to 0.5 μm and a membrane porosity of 30 to 90%. A biofilm is attached to and grown on the surface of the membrane assembly;

[0020] The air filter (19); the air inlet valve (20); the aeration fan (21); and the air inlet flow meter (22) together constitute an aeration system, wherein the air filter (19) is used for dehumidification, dust removal and pressure regulation of the air, and the air inlet pressure is 300-350 mbar;

[0021] The online monitoring electrode (27), the online monitoring electrode (28) and the automatic control system (29) together constitute an online feedback control system for real-time monitoring and feedback of NH at the end of the MABR reaction zone (1-3) and the anaerobic ammonium oxidation granular sludge zone (1-1). 4 + -N, NO 2 - -N, NO 3 - -N value.

[0022] Based on the above device, a one-stage EGSB anaerobic ammonium oxidation device based on MABR is invented. The specific operation steps are as follows:

[0023] (i) Water inlet operation: open the water inlet valve (17), start the water inlet pump (18), set the flow rate through the water inlet flow meter (16), and the raw water in the water inlet tank (15) enters the device body (1) through the first perforated water distributor (13);

[0024] (ii) Air intake operation: Open the air intake valve (20), start the aeration fan (21), set the air volume through the air intake flow meter (22), and the air passes through the air filter (19) to remove dust and moisture, and after pressure control, enters the MABR membrane module (23);

[0025] (iii) Tail gas monitoring: Open the tail gas valve (25), discharge the tail gas from the MABR membrane module (23), and record the values ​​of the tail gas oxygen concentration meter (24) and the tail gas flow meter (26) for calculating the oxygen utilization efficiency and regulating the aeration parameters;

[0026] (IV) Reflux operation: The MABR reaction zone (1-3) and the anaerobic ammonium oxidation granular sludge zone (1-1) are both equipped with independent reflux systems, which respectively perform reflux control according to the monitoring values ​​of the online monitoring electrode (27) and the online monitoring electrode (28):

[0027] MABR reaction zone (1-3): open the third internal reflux valve (9), start the third internal reflux pump (11), and adjust the third internal reflux flowmeter (10) according to the value monitored by the online monitoring electrode (27) to maintain NH 4 + -N and NO 2 - -N mass concentration ratio is between 1:1-1:1.5;

[0028] Anaerobic ammonium oxidation granular sludge zone (1-1): open the internal reflux main valve (3), open the second internal reflux valve (5), start the second internal reflux pump (8), and adjust the second internal reflux flow meter (7) according to the value monitored by the online monitoring electrode (28) to maintain NH 4 + -N and NO 2 - -N concentration is not higher than 10mg / L;

[0029] (V) MABR flushing operation: The biofilm on the surface of the MABR membrane assembly (23) should not be too thick and needs to be flushed regularly to eliminate the aged biological layer. The first internal reflux valve (4) is opened, the first internal reflux pump (12) is started, and the first internal reflux flowmeter (6) is adjusted. The biofilm of the MABR membrane assembly (23) is flushed for 10 minutes / 48 hours;

[0030] In the steps (ii) and (iii), the air volume is set by the air intake flow meter (22), the air filter (19) is used to remove dust and moisture, and the pressure is controlled. The exhaust gas oxygen concentration meter (24) and the exhaust gas flow meter (26) are used to monitor the values, and the oxygen utilization efficiency is calculated to achieve accurate oxygen supply control;

[0031] In the step (iv), the MABR reaction zone (1-3) and the anaerobic ammonium oxidation granular sludge zone (1-1) are flexibly refluxed and regulated through the monitoring feedback of the online monitoring electrode (27) and the online monitoring electrode (28), so that the water quality at the end of the MABR reaction zone (1-3) meets the NH4+ content of the influent of the anaerobic ammonium oxidation granular sludge zone (1-1). 4 + -N and NO 2 - -N mass concentration ratio is between 1:1-1:1.5, and the effluent quality of the anaerobic ammonium oxidation granular sludge area (1-1) is regulated in real time;

[0032] In the step (five), under the operating condition of the reflux operation (four), the first internal reflux valve (4) is opened and closed, the first internal reflux pump (12) is started and stopped, and the first internal reflux flowmeter (6) is adjusted to complete the regular flushing of the biofilm on the surface of the MABR membrane assembly (23).

[0033] Compared with the existing one-stage EGSB anaerobic ammonium oxidation device, the present invention has the following advantages:

[0034] (1) MABR is coupled with EGSB to achieve effective enrichment of AOB and elimination of NOB through precise oxygen supply regulation, providing substrate guarantee for the effective anaerobic ammonium oxidation reaction;

[0035] (2) MABR membrane components not only provide precise oxygen supply, but also act as biological carriers. The biofilm has a large biomass, a long food chain, and AOB is not easily lost;

[0036] (3) Separate the AOB reaction zone of the MABR from the granular sludge anaerobic ammonium oxidation reaction zone, and set up an online monitoring feedback system and a reflux control system respectively, so as to maximize the operating efficiency of the EGSB system while satisfying the optimization control of the two reaction zones;

[0037] (4) MABR membrane modules have low aeration energy consumption, reducing the overall operating cost of the system;

[0038] (5) The EGSB internal recirculation system is flexible and versatile, which not only meets the operating requirements of the two reaction zones, but also can realize the flushing and regulation of the biofilm thickness of the MABR membrane module. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the device of the present invention.

[0040] Device body (1); anaerobic ammonium oxidation granular sludge zone (1-1); sieve plate flange (1-2); MABR reaction zone (1-3); three-phase separator (2); internal return main valve (3); first internal return valve (4); second internal return valve (5); first internal return flow meter (6); second internal return flow meter (7); second internal return pump (8); third internal return valve (9); third internal return flow meter (10); third internal return pump (11); first internal return pump (12); first perforated water distributor (13); second perforated water distributor (14); ); water inlet box (15); water inlet flow meter (16); water inlet valve (17); water inlet pump (18); air filter (19); air inlet valve (20); aeration fan (21); air inlet flow meter (22); MABR membrane assembly (23); tail gas oxygen concentration meter (24); tail gas valve (25); tail gas flow meter (26); online monitoring electrode (27); online monitoring electrode (28); automatic control system (29); water outlet overflow weir (30); U-shaped water outlet (31); gas production valve (32); reactor vent valve (33); DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 Embodiments of the present invention will be described.

[0042] The volume ratio of the anaerobic ammonium oxidation granular sludge zone (1-1) and the MABR reaction zone (1-3) is maintained between 1:1;

[0043] The sieve plate flange (1-2) has a pore size range of 1.5 mm and is used to intercept the biofilm detached from the surface of the MABR membrane assembly (23) and enter the anaerobic ammonium oxidation granular sludge area (1-1);

[0044] The MABR membrane assembly (23) is a hollow fiber membrane with a pore size of 0.01 μm and a porosity of 75%. A biofilm is attached to and grown on the surface of the membrane assembly. The tail gas system of the membrane assembly includes: a tail gas oxygen concentration measuring instrument (24); a tail gas valve (25); and a tail gas flow meter (26) for calculating oxygen utilization efficiency and regulating aeration parameters.

[0045] The air filter (19), the air intake valve (20), the aeration fan (21), and the air intake flow meter (22) together constitute an aeration system, wherein the air filter (19) is used for dehumidification, dust removal and pressure regulation of the air, and the air intake pressure is 300 mbar.

[0046] A one-stage EGSB anaerobic ammonium oxidation device based on MABR, the operation steps are as follows:

[0047] (i) Water inlet operation: open the water inlet valve (17), start the water inlet pump (18), set the flow rate through the water inlet flow meter (16), and the raw water in the water inlet tank (15) enters the device body (1) through the first perforated water distributor (13);

[0048] (ii) Air intake operation: Open the air intake valve (20), start the aeration fan (21), set the air volume through the air intake flow meter (22), and the air passes through the air filter (19) to remove dust and moisture, and after pressure control, enters the MABR membrane module (23);

[0049] (iii) Tail gas monitoring: Open the tail gas valve (25), discharge the tail gas from the MABR membrane module (23), and record the values ​​of the tail gas oxygen concentration meter (24) and the tail gas flow meter (26) for calculating the oxygen utilization efficiency and regulating the aeration parameters;

[0050] (IV) Reflux operation: The MABR reaction zone (1-3) and the anaerobic ammonium oxidation granular sludge zone (1-1) are both equipped with independent reflux systems, which respectively perform reflux control according to the monitoring values ​​of the online monitoring electrode (27) and the online monitoring electrode (28):

[0051] MABR reaction zone (1-3): open the third internal reflux valve (9), start the third internal reflux pump (11), and adjust the third internal reflux flowmeter (10) according to the value monitored by the online monitoring electrode (27) to maintain NH 4 + -N and NO 2 - -N mass concentration ratio is between 1:1-1:1.5;

[0052] Anaerobic ammonium oxidation granular sludge zone (1-1): open the internal reflux main valve (3), open the second internal reflux valve (5), start the second internal reflux pump (8), and adjust the second internal reflux flow meter (7) according to the value monitored by the online monitoring electrode (28) to maintain NH 4 + -N and NO 2 - -N concentration is not higher than 5mg / L;

[0053] (V) MABR flushing operation: The biofilm on the surface of the MABR membrane assembly (23) should not be too thick and needs to be flushed regularly to eliminate the aged biological layer. The first internal reflux valve (4) is opened, the first internal reflux pump (12) is started, and the first internal reflux flowmeter (6) is adjusted. The biofilm of the MABR membrane assembly (23) is flushed for 10 minutes / 48 hours;

[0054] Example 1

[0055] (1) EGSB reactor startup and acclimatization:

[0056] The MABR reaction zone (1-3) was inoculated with flocculent AOB sludge at a concentration of 4 g / L;

[0057] The anaerobic ammonium oxidation granular sludge area (1-1) is inoculated with anaerobic ammonium oxidation granular sludge, with a particle size of about 2 mm and an inoculation concentration of 8 g / L;

[0058] Influent NH 4 + -N concentration is controlled at 50-100 mg / L, inlet pH is controlled at 7.5-7.8, and trace elements and nutrients are added at the same time. The specific formula is as follows:

[0059] Table 1. Trace elements and nutrient salt formula

[0060]

[0061] Start the acclimation phase, MABR reaction zone (1-3), open the third internal reflux valve (9), start the third internal reflux pump (11), adjust the third internal reflux flowmeter (10) according to the value monitored by the online monitoring electrode (27), and maintain NH 4 + -N and NO 2 - -N mass concentration ratio is between 1:1-1:1.5;

[0062] Anaerobic ammonium oxidation granular sludge zone (1-1): open the internal reflux main valve (3), open the second internal reflux valve (5), start the second internal reflux pump (8), and adjust the second internal reflux flow meter (7) according to the value monitored by the online monitoring electrode (28) to maintain NH 4 + -N and NO 2 - -N concentrations were all below 5 mg / L;

[0063] Under the above acclimation conditions, after 120 days of operation, NH 4 + -N removal rate reaches over 95%, and the effluent NO 3 - The -N concentration was about 15 mg / L, which was in line with the theoretical generation amount. A biofilm was formed on the surface of the MABR membrane module, and the anaerobic ammonium oxidation sludge concentration increased to 10 g / L.

[0064] (2) Stable operation of EGSB reactor: After successful startup and acclimation, the influent NH 4 + -N concentration is controlled at 150mg / L, inlet pH is controlled at 7.5-7.8, and the concentration of trace elements and nutrients remains unchanged;

[0065] In the MABR reaction zone (1-3), the third internal reflux valve (9) is opened, the third internal reflux pump (11) is started, and the third internal reflux flow meter (10) is adjusted according to the value monitored by the online monitoring electrode (27) to maintain NH 4 + -N and NO 2 - -N mass concentration ratio is between 1:1-1:1.5;

[0066] In the anaerobic ammonium oxidation granular sludge zone (1-1), the internal reflux main valve (3) is opened, the second internal reflux valve (5) is opened, the second internal reflux pump (8) is started, and the second internal reflux flow meter (7) is adjusted according to the value monitored by the online monitoring electrode (28) to maintain NH 4 + -N and NO 2 - -N concentrations were all below 5 mg / L, NH 4 + -N removal rate was maintained above 95%, and the effluent NO 3 - The -N concentration is about 20 mg / L, which is consistent with the theoretical production amount.

[0067] (3) MABR flushing operation: During the stable operation of the EGSB reactor, the MABR membrane assembly is regularly flushed. The first internal reflux valve (4) is opened, the first internal reflux pump (12) is started, the first internal reflux flowmeter (6) is adjusted, and the biofilm of the MABR membrane assembly (23) is flushed for 10 minutes / 48 hours.

[0068] (4) Compared with the traditional EGSB, under the same operating scale and water quality conditions, the one-stage EGSB anaerobic ammonium oxidation unit based on MABR has better operating stability and saves about 35% of aeration energy consumption.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, other improvements and modifications may be made without departing from the main structure and principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for a one-stage EGSB anaerobic ammonium oxidation device using MABR, Its characteristics are: The device used in the method comprises a device body (1); an anaerobic ammonium oxidation granular sludge zone (1-1); a sieve plate flange (1-2); an MABR reaction zone (1-3); a three-phase separator (2); an internal reflux main valve (3); a first internal reflux valve (4); a second internal reflux valve (5); a first internal reflux flowmeter (6); a second internal reflux flowmeter (7); a second internal reflux pump (8); a third internal reflux valve (9); a third internal reflux flowmeter (10); a third internal reflux pump (11); a first internal reflux pump (12); a first perforated water distributor (13); a second perforated water distributor (14); water inlet tank (15); water inlet flow meter (16); water inlet valve (17); water inlet pump (18); air filter (19); air inlet valve (20); aeration fan (21); air inlet flow meter (22); MABR membrane assembly (23); tail gas oxygen concentration meter (24); tail gas valve (25); tail gas flow meter (26); first online monitoring electrode (27); second online monitoring electrode (28); automatic control system (29); water outlet overflow weir (30); U-shaped water outlet (31); gas production valve (32); reactor vent valve (33); The device body (1) is divided into an anaerobic ammonium oxidation granular sludge zone (1-1) and a MABR reaction zone (1-3) by a sieve plate flange (1-2); The internal reflux system of the device body (1) comprises: an internal reflux main valve (3); a first internal reflux valve (4); a second internal reflux valve (5); a first internal reflux flowmeter (6); a second internal reflux flowmeter (7); a second internal reflux pump (8); a third internal reflux valve (9); a third internal reflux flowmeter (10); a third internal reflux pump (11); a first internal reflux pump (12); a first perforated water distributor (13); a second perforated water distributor (14); The internal return main valve (3) is connected in sequence to the first internal return valve (4); the first internal return flow meter (6); the first internal return pump (12) and the first perforated water distributor (13); the internal return main valve (3) is connected in sequence to the second internal return valve (5); the second internal return flow meter (7); the second internal return pump (8) and the second perforated water distributor (14); the first perforated water distributor (13) is arranged in the MABR reaction zone (1-3); the second perforated water distributor (14) is arranged in the anaerobic ammonium oxidation granular sludge zone (1-1); The third internal reflux valve (9); the third internal reflux flowmeter (10); the third internal reflux pump (11) and the MABR reaction zone (1-3) form a loop; The exhaust system of the MABR membrane assembly (23) comprises: an exhaust gas oxygen concentration measuring instrument (24); an exhaust gas valve (25) and an exhaust gas flow meter (26), which are used to calculate oxygen utilization efficiency and control aeration parameters; The air filter (19), the air intake valve (20), the aeration fan (21), and the air intake flow meter (22) together constitute an aeration system, wherein the air filter (19) is used for dehumidification, dust removal and pressure regulation of the air, and the air intake pressure is 300-350 mbar; The first online monitoring electrode (27), the second online monitoring electrode (28) and the automatic control system (29) together constitute an online feedback control system for real-time monitoring and feedback of NH at the end of the MABR reaction zone (1-3) and the anaerobic ammonium oxidation granular sludge zone (1-1). 4 + -N, NO 2 - -N, NO 3 - -N value; The volume ratio of the anaerobic ammonium oxidation granular sludge zone (1-1) and the MABR reaction zone (1-3) is maintained between 1:1 and 3:1; The sieve plate flange (1-2) has a pore size range of 1-3 mm and is used to intercept biofilm detached from the surface of the MABR membrane assembly (23) and enter the anaerobic ammonium oxidation granular sludge area (1-1); The MABR membrane assembly (23) is a hollow fiber membrane with a membrane pore size ranging from 0.01 to 0.5 μm and a membrane porosity of 30 to 90%. A biofilm is attached to and grown on the surface of the membrane assembly; The method comprises the following steps: (i) Water inlet operation: open the water inlet valve (17), start the water inlet pump (18), set the flow rate through the water inlet flow meter (16), and the raw water in the water inlet tank (15) enters the device body (1) through the first perforated water distributor (13); (ii) Air intake operation: Open the air intake valve (20), start the aeration fan (21), set the air volume through the air intake flow meter (22), and the air passes through the air filter (19) to remove dust and moisture, and after pressure control, enters the MABR membrane module (23); (iii) Tail gas monitoring: Open the tail gas valve (25), discharge the tail gas from the MABR membrane assembly (23), and record the values ​​of the tail gas oxygen concentration meter (24) and the tail gas flow meter (26) for calculation of oxygen utilization efficiency and regulation of aeration parameters; (IV) Reflux operation: The MABR reaction zone (1-3) and the anaerobic ammonium oxidation granular sludge zone (1-1) are both equipped with independent reflux systems, which respectively perform reflux control according to the monitoring values ​​of the first online monitoring electrode (27) and the second online monitoring electrode (28): MABR reaction zone (1-3): open the third internal reflux valve (9), start the third internal reflux pump (11), and adjust the third internal reflux flowmeter (10) according to the monitoring value of the first online monitoring electrode (27) to maintain NH 4 + -N and NO 2 - -N mass concentration ratio is between 1:1-1:1.5; Anaerobic ammonium oxidation granular sludge zone (1-1): open the internal reflux main valve (3), open the second internal reflux valve (5), start the second internal reflux pump (8), and adjust the second internal reflux flow meter (7) according to the monitoring value of the second online monitoring electrode (28) to maintain NH 4 + -N and NO 2 - -N concentration is not higher than 10mg / L; (V) MABR flushing operation: The biofilm on the surface of the MABR membrane assembly (23) should not be too thick and needs to be flushed regularly to eliminate the aged biological layer. The first internal reflux valve (4) is opened, the first internal reflux pump (12) is started, and the first internal reflux flowmeter (6) is adjusted. The biofilm on the MABR membrane assembly (23) is flushed for 10 minutes / 48 hours. In the steps (ii) and (iii), the air volume is set by the air intake flow meter (22), the air filter (19) is used to remove dust and moisture, and the pressure is controlled. The exhaust gas oxygen concentration meter (24) and the exhaust gas flow meter (26) are used to monitor the values, and the oxygen utilization efficiency is calculated to achieve accurate oxygen supply control; In the step (iv), the MABR reaction zone (1-3) and the anaerobic ammonium oxidation granular sludge zone (1-1) are flexibly regulated for backflow through the monitoring feedback of the first online monitoring electrode (27) and the second online monitoring electrode (28), so that the water quality at the end of the MABR reaction zone (1-3) meets the NH4+ content of the influent of the anaerobic ammonium oxidation granular sludge zone (1-1). 4 + -N and NO 2 - -N mass concentration ratio is between 1:1-1:1.5, and the effluent quality of the anaerobic ammonium oxidation granular sludge area (1-1) is regulated in real time; In the step (fifth), under the operating condition of the reflux operation (fourth), the first internal reflux valve (4) is opened and closed, the first internal reflux pump (12) is started and stopped, and the first internal reflux flowmeter (6) is adjusted to complete the regular flushing of the biofilm on the surface of the MABR membrane assembly (23).

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