Sewage treatment system for applying MBR (Membrane Bioreactor) membrane to anaerobic ammonia oxidation

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system with an MBR (membrane bioreactor) membrane applied to anaerobic ammonia oxidation, which comprises a water inlet tank, a micro-aerobic tank, a water replenishing tank, an anoxic tank and a sedimentation drain tank, adjusting the pH and temperature of the wastewater by the water inlet tank; a PVDF MBR membrane is installed in the micro-aerobic tank, the aperture is 0.1-0.4 micron, intermittent aeration is carried out, and a nano iron oxide catalyst is added; supplementing ammonia nitrogen in a water supplementing pool; stirring and denitrifying in an anoxic tank; and the system further comprises a backwashing system. Sludge is intercepted through the MBR membrane, loss is reduced, the sludge concentration is guaranteed, and the removal rate is increased; the MBR membrane is backwashed by compressed air, dissolved oxygen is provided, and energy consumption is reduced; the hydraulic impact load resistance is high, and the device can be flexibly applied to pools or integrated equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a sewage treatment system applying MBR membrane to anaerobic ammonia oxidation. BACKGROUND

[0002] As a high-efficiency biological denitrification technology, the anaerobic ammonia oxidation process has important application value in the field of sewage treatment. Its principle is to oxidize ammonia into nitrogen gas under anaerobic conditions, taking ammonia as the electron donor and nitrate or nitrite as the electron acceptor. Compared with the traditional nitrification-denitrification process, this process has many advantages, such as saving oxygen supply, saving carbon source, reducing sludge production, reducing greenhouse gas emissions, etc. However, ammonia-oxidizing bacteria have poor adaptability to the environment, which leads to obvious defects in existing anaerobic ammonia oxidation systems, and the problem of poor resistance to hydraulic impact is particularly prominent. When the water quality changes or the amount of wastewater treated is unstable, the ammonia-oxidizing microorganisms will be quickly lost, thereby reducing the sludge volume load of the anaerobic ammonia oxidation system, and the removal rate in the system will also decrease.

[0003] In actual application, the wastewater produced by enterprises often presents intermittent drainage, fluctuating drainage and other situations. The way of drainage according to the production situation makes the water quality of the influent fluctuate greatly. When the traditional anaerobic ammonia oxidation system faces such a situation, the sludge loss problem is more serious, and a large amount of sludge loss occurs in the micro-aerobic tank. This not only affects the treatment effect of the system, but also increases the difficulty and cost of operation and management, and restricts the wide application of the anaerobic ammonia oxidation process in actual sewage treatment. Therefore, how to reduce the loss of ammonia-oxidizing microorganisms, ensure the sludge concentration in the system, and improve the resistance to hydraulic impact load of the system has become a technical problem to be solved.

[0004] In order to improve the above-mentioned problems existing in the traditional anaerobic ammonia oxidation system, relevant technical personnel have been exploring effective solutions. MBR membrane, as a kind of deep treatment process commonly used in the end of biological treatment of wastewater, has the characteristics of high interception effect of sludge, which can ensure the sludge concentration of the front-end biological tank. Based on this, applying MBR membrane to the anaerobic ammonia oxidation sewage treatment system is expected to use its characteristics to intercept microorganisms in the micro-aerobic tank, reduce sludge loss, and thus improve the resistance to hydraulic impact and operation efficiency of the system. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present application provides a sewage treatment system applying MBR membrane to anaerobic ammonia oxidation.

[0007] (II) Technical solutions

[0008] The application relates to an MBR membrane applied to an anaerobic ammonia oxidation sewage treatment system, which comprises a water inlet pool, a micro-aerobic pool, a water supplement pool, an anoxic pool and a sedimentation and drainage pool which are sequentially connected, and the specific structures and functions of the modules are as follows:

[0009] The water inlet pool module is used for homogenously and equally treating wastewater, is internally provided with a pH adjusting assembly and a temperature adjusting device; the pH adjusting assembly comprises a calcium carbonate and magnesium hydroxide composite adjusting agent with a mass ratio of 1:2.5; and the temperature adjusting device adjusts the wastewater temperature to 25-35 DEG C through an electric heating element.

[0010] The micro-aerobic pool module is internally provided with an MBR membrane assembly made of polyvinylidene fluoride (PVDF) and adopts a cross-flow filtration mode; an intermittent aeration device is arranged at the bottom of the pool, and a DO concentration monitor is arranged, the aeration amount is automatically adjusted when the dissolved oxygen concentration is higher than 0.5 mg / L, nano iron oxide catalyst is added into the pool to catalyze the anaerobic ammonia oxidation reaction, and the reaction equation is: NH4 + + NO2 - = N2 + 2H2O.

[0011] The water supplement pool module is used for supplementing ammonia nitrogen of the wastewater, is internally provided with an ammonia nitrogen concentration monitor and a stirring paddle; when the ammonia nitrogen concentration is monitored to be lower than 100 mg / L, ammonium chloride solution is automatically added, and the stirring paddle is operated at a rotating speed of 60-90 r / min; a flow control device is arranged between the water supplement pool and the micro-aerobic pool, when the sludge concentration of the micro-aerobic pool is higher than 5000 mg / L, the water supplement amount is adjusted to 80%-90% of the design flow, and when the sludge concentration is lower than 3000 mg / L, the water supplement amount is adjusted to 110%-120% of the design flow.

[0012] The anoxic pool module is a further denitrification unit, is internally provided with a stirring device with a stirring speed of 100-150 r / min, a carbon source adding device and an oxidation-reduction potential (ORP) monitor; the carbon source adding device adds sodium acetate.

[0013] The sedimentation and drainage pool module is a terminal treatment unit, is internally provided with an inclined pipe sedimentation assembly and a sludge backflow device; the sludge backflow device returns the sedimentation sludge to the micro-aerobic pool at a backflow ratio of 50%-100%, an ammonia nitrogen index is monitored in real time by a water quality monitor in the pool, and a perforated sludge discharge pipe is arranged at the bottom of the pool.

[0014] Preferably, a backwashing system is further included, 0.1-0.2 MPa compressed air is used to backwash the MBR membrane assembly for 10-15 minutes, the backwashing period is 2-4 hours, the dissolved oxygen concentration in the micro-aerobic pool is maintained at 0.2-0.5 mg / L during backwashing, and the washing water is discharged from the system through a membrane water pump.

[0015] Preferably, the water inlet tank is also provided with a flocculant adding device, and polyaluminum chloride (PAC) is added in an amount of 10-30 mg / L to remove suspended solids in the wastewater by flocculation and reduce the turbidity to below 10 NTU; the tank is also provided with an ultrasonic liquid level meter to monitor the water level in real time and link the water inlet valve.

[0016] Preferably, the micro-aerobic tank is provided with a temperature sensor, and when the temperature is lower than 25℃, the water inlet tank temperature adjusting device is heated at a power of 1-2 kW / m 3 .

[0017] Preferably, the effective volume ratio of the anoxic tank to the micro-aerobic tank is 1:2, and the tank is provided with biological filler, and the filler filling rate is 30%-40%.

[0018] Preferably, the surface load of the inclined pipe precipitation assembly in the sedimentation and drainage tank is 1.0-1.5 m 3 / (m 2 ·h), and the precipitation time is 2-3 h to ensure that the effluent SS is ≤10 mg / L.

[0019] Preferably, the membrane flux of the MBR membrane assembly is controlled at 10-15 L / (m 2 ·h), the membrane filtration pressure is adjusted by the start-stop frequency of the membrane effluent pump, and the transmembrane pressure difference is maintained at ≤30 kPa.

[0020] Preferably, the water supplement tank is provided with a pH auxiliary adjusting device, and when the pH of the wastewater after supplementing ammonia nitrogen is less than 6.5, sodium hydroxide solution is automatically added to adjust the pH to 6.5-7.0.

[0021] Preferably, the effluent end of the sedimentation and drainage tank is provided with an ultraviolet disinfection device with a power of 30-50 W / m 3 , to disinfect the treated wastewater and ensure that the fecal coliform count of the effluent is ≤1000 / L.

[0022] Preferably, when the sewage treatment system is integrated into an integrated device, the carbon steel anticorrosive material is used for each module in the device, and the volume ratio of the water inlet tank, the micro-aerobic tank, the water supplement tank, the anoxic tank and the sedimentation and drainage tank is 2:3:1:1.5:1.5, which is suitable for the treatment of special wastewater with COD ≤500 mg / L and ammonia nitrogen ≤300 mg / L.

[0023] (Three) Beneficial technical effects

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] 1. By installing MBR membrane components in the micro-aerobic tank, the high efficiency interception of the MBR membrane components is used to intercept microorganisms in the micro-aerobic tank, so that the microorganisms are not lost, thereby ensuring the sludge concentration in the tank. The stable sludge concentration significantly improves the removal rate of the system, and even in the case of fluctuation of the influent water quality, the treatment effect can be maintained, thereby solving the problem of removal rate reduction caused by sludge loss in the traditional system.

[0026] 2. The micro-aerobic tank needs to provide a small amount of dissolved oxygen, and by using compressed air backwashing MBR membrane, the problem of membrane blockage is solved, and the micro-aerobic tank is also provided with dissolved oxygen. The intermittent backwashing design does not need to additionally set a special aeration device to maintain the micro-aerobic environment, reduces the equipment investment and energy consumption, realizes one method with multiple uses, and achieves the purpose of reducing energy consumption.

[0027] 3. Due to the interception effect of the MBR membrane on the sludge, the system can maintain stable operation state when facing intermittent drainage, fluctuating drainage and other water quality fluctuations. Even if the influent water quality changes, the microorganism concentration in the micro-aerobic tank will not decrease significantly, thereby ensuring the removal effect of the system on pollutants and improving the adaptability and stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a module diagram of a wastewater treatment system using MBR membrane for anaerobic ammonia oxidation according to the present application;

[0029] Figure 2 is a line comparison diagram of ammonia nitrogen removal rates of the example and the comparative example;

[0030] Figure 3 is a column comparison diagram of water quality parameters of the example and the comparative example;

[0031] Figure 4 is a technical diagram of a wastewater treatment system using MBR membrane for anaerobic ammonia oxidation according to the present application;

[0032] Figure 5 is a fitting curve of the influence of the micro-aerobic tank nano iron oxide dosage on the ammonia nitrogen removal rate;

[0033] Figure 6 is a fitting curve of the influence of the sludge return ratio on the effluent ammonia nitrogen concentration. DETAILED DESCRIPTION

[0034] According to Figures 1 to 4 , the specific embodiments of the present application are as follows:

[0035] I. System composition and working principle

[0036] The MBR membrane described in the application is applied to an anaerobic ammonia oxidation sewage treatment system, which is composed of the following modules:

[0037] Inflow pool: for homogenizing and equalizing wastewater, provided with pH adjusting assembly (mass ratio of calcium carbonate to magnesium hydroxide 1:2.5), temperature adjusting device (electric heating to 25-35℃), ultrasonic liquid level meter (controlling liquid level 60%-80% of pool depth) and PAC adding device (10-30 mg / L).

[0038] Micro-aerobic pool: core reaction unit, provided with PVDF material MBR membrane (pore diameter 0.1-0.4 μm, cross-flow filtration, membrane surface flow rate 0.3-0.8 m / s), intermittent aeration at the bottom (0.5-1.2 m 3 / (m 2 ·h), adding 50-100 mg / L nano iron oxide catalyst, catalytic reaction formula is NH4 + +NO2 - =N2↑+2H2O, equipped with DO monitor (maintaining 0.2-0.5 mg / L) and temperature sensor.

[0039] Water supplement pool: monitoring ammonia nitrogen concentration (adding ammonium chloride to 150-250 mg / L when lower than 100 mg / L), provided with stirring paddle (60-90 r / min) and flow control device (adjusting water supplement amount according to sludge concentration 3000-5000 mg / L).

[0040] Anoxic pool: realizing denitrification through stirring device (100-150 r / min), sodium acetate adding device (COD / N=3-5), ORP monitor (starting adding when >-150 mV) and biological filler (filling rate 30%-40%).

[0041] Sedimentation and drainage pool: containing inclined pipe sedimentation assembly (inclination 60°, pipe diameter 50-80 mm), sludge backflow device (backflow ratio 50%-100%), perforated sludge discharge pipe (100-150 mm, discharging sludge at intervals of 8-12 h) and ultraviolet disinfection device (30-50 W / m 3 ).

[0042] Backwashing system: 0.1-0.2 MPa compressed air backwashing is performed on the MBR membrane, cycle 2-4 h, each time 10-15 min, maintaining dissolved oxygen in the micro-aerobic pool 0.2-0.5 mg / L. II. Specific embodiment

[0044] Example 1: treating chemical industry wastewater (COD=400 mg / L, ammonia nitrogen=250 mg / L)

[0045] Influent tank treatment: wastewater into the tank, ultrasonic liquid level meter control liquid level to 70% pool depth. Add calcium carbonate and magnesium hydroxide (1:2.5) to adjust pH to 7.2, electric heating to 28℃, add PAC 20mg / L, stirring for 15min, turbidity is reduced to 8NTU.

[0046] Micro-aerobic tank reaction: wastewater flows in, MBR membrane surface flow rate 0.5m / s, aeration rate 0.8m 3 / (m 2 ·h), add nano-iron oxide 80mg / L. Maintain DO at 0.3mg / L, temperature 28℃, sludge concentration 9000mg / L, and carry out anaerobic ammonia oxidation reaction.

[0047] Make-up tank adjustment: ammonia nitrogen monitoring 120mg / L, no need to add ammonium chloride; micro-aerobic tank sludge concentration 8500mg / L, make-up water amount adjusted to 85% of design flow.

[0048] Anoxic tank denitrification: stirring rate 120r / min, ORP value-180mV, no carbon source added, biological filler filling rate 35%.

[0049] Sedimentation and drainage treatment: inclined tube sedimentation surface load 1.2m 3 / (m 2 ·h), sedimentation 2.5h, sludge return ratio 70%. Effluent ammonia nitrogen 3mg / L, ultraviolet disinfection power 40W / m 3 , up to discharge standard.

[0050] Example 2: Treatment of food processing wastewater (COD=350mg / L, ammonia nitrogen=180mg / L)

[0051] Influent tank treatment: liquid level control to 65% pool depth, adjust pH to 6.8, heat to 30℃, add PAC 15mg / L, turbidity is reduced to 5NTU.

[0052] Micro-aerobic tank reaction: membrane surface flow rate 0.6m / s, aeration rate 1.0m 3 / (m 2 ·h), add nano-iron oxide 60mg / L, maintain DO at 0.4mg / L, sludge concentration 8000mg / L.

[0053] Make-up tank adjustment: ammonia nitrogen monitoring 90mg / L, add ammonium chloride to 180mg / L, stirring paddle 70r / min; sludge concentration 7500mg / L, make-up water amount adjusted to 90% of design flow.

[0054] Anoxic tank denitrification: stirring rate 130r / min, ORP value-160mV, add sodium acetate (COD / N=4), biological filler filling rate 30%.

[0055] Sedimentation drainage treatment: inclined tube sedimentation surface load 1.3 m 3 / (m 2 ·h), sedimentation 2 h, sludge return ratio 80%, effluent ammonia nitrogen 2.5 mg / L, UV disinfection power 35 W / m 3 .

[0056] Example 3: treatment of pharmaceutical wastewater (COD = 500 mg / L, ammonia nitrogen = 300 mg / L)

[0057] Influent pool treatment: liquid level control to 75% pool depth, pH adjustment to 8.0, heating to 25℃, PAC 30 mg / L, turbidity reduction to 10 NTU.

[0058] Micro-aerobic tank reaction: membrane surface flow rate 0.8 m / s, aeration amount 1.2 m 3 / (m 2 ·h), nano-iron oxide 100 mg / L, DO maintained at 0.5 mg / L, sludge concentration 10000 mg / L.

[0059] Make-up pool adjustment: ammonia nitrogen monitoring 150 mg / L, no need to add ammonium chloride; sludge concentration 9500 mg / L, make-up water amount adjusted to 80% of design flow.

[0060] Anoxic tank denitrification: stirring rate 150 r / min, ORP value -140 mV, sodium acetate (COD / N = 5) added, biological filler filling rate 40%.

[0061] Sedimentation drainage treatment: inclined tube sedimentation surface load 1.5 m 3 / (m 2 ·h), sedimentation 3 h, sludge return ratio 100%, effluent ammonia nitrogen 4 mg / L, UV disinfection power 50 W / m 3 .

[0062] III. Comparative example: traditional anaerobic ammonia oxidation system (without MBR membrane)

[0063] Treatment process:

[0064] Influent pool treatment: wastewater into the pool, ultrasonic level gauge controls liquid level to 70% pool depth, pH adjustment to 7.2 by adding calcium carbonate and magnesium hydroxide in a mass ratio of 1:2.5, electric heating to 28℃, PAC 20 mg / L, stirring for 15 min, turbidity reduction to 8 NTU.

[0065] Micro-aerobic tank reaction: wastewater flows in, using microporous aeration, aeration amount 0.8 m 3 / (m 2 ·h), no MBR membrane and nano-iron oxide added, sludge concentration reduced to 3000 mg / L, anaerobic ammonia oxidation reaction.

[0066] Make-up tank regulation: ammonia nitrogen monitoring 120 mg / L, no need to add ammonium chloride; make-up amount according to design flow 100% operation.

[0067] Anoxic tank denitrification: stirring rate 120 r / min, adding sodium acetate (COD / N=4), biological filler filling rate 35%.

[0068] Sedimentation tank treatment: inclined tube sedimentation component inclination 60°, pipe diameter 50-80 mm, surface load 1.2 m 3 / (m 2 ·h), sedimentation 2.5 h, sludge return ratio 70%, perforated sludge discharge pipe (100-150 mm, interval 8-12 h sludge discharge) at the bottom, effluent discharged after ultraviolet disinfection.

[0069] The ammonia nitrogen removal rate and effluent water quality parameters of the examples and the comparative examples are compared as follows:

[0070] Table 1

[0071]

[0072]

[0073] The effluent ammonia nitrogen, COD and SS indexes of examples 1-3 are better than those of the comparative examples, the COD removal rate is 88%-93%, and SS≤10 mg / L, while the effluent COD of the comparative examples is 120 mg / L and SS is 25 mg / L, which shows that the system can significantly improve the water purification effect through the synergistic effect of MBR membrane interception and biochemical reaction. The ammonia nitrogen removal rate of the three examples of the present application is more than 89%, which is significantly higher than 65.2% of the comparative examples, indicating that the combination of MBR membrane and nano iron oxide can effectively improve the denitrification efficiency, and verifies the advantages of the system in resisting hydraulic impact and maintaining sludge concentration.

[0074] The influence of nano iron oxide dosage in the micro-aerobic tank on the ammonia nitrogen removal rate is as follows:

[0075] Table 2

[0076] Nano iron oxide dosage (mg / L) Ammonia nitrogen removal rate (%) 0 75 50 85 80 90.8 100 91

[0077] When the dosage increases from 0 to 80 mg / L, the ammonia nitrogen removal rate increases by 15.8%; when the dosage exceeds 80 mg / L, the removal rate tends to be stable, indicating that 80 mg / L is the optimal catalytic dosage, which can strengthen the anaerobic ammonia oxidation reaction efficiency.

[0078] The influence of sludge return ratio on effluent ammonia nitrogen concentration is as follows:

[0079] Table 2

[0080] Sludge return ratio (%) Effluent ammonia nitrogen concentration (mg / L) 50 5 70 3 80 2.8 100 2.5

[0081] When the reflux ratio is increased from 50% to 100%, the effluent ammonia nitrogen is decreased from 5 mg / L to 2.5 mg / L, indicating that appropriately increasing the reflux ratio can enhance the sludge concentration in the micro-aerobic tank and improve the denitrification effect, but the difference between the effects of 100% and 80% reflux ratio is small, and it is suggested that the optimal reflux ratio is 70%-80%.

[0082] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and spirit of the application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment system for anaerobic ammonium oxidation using MBR membrane characterized in that, The system comprises sequentially connected water inlet pool, micro-aerobic pool, water supplement pool, anoxic pool and sedimentation and drainage pool, and the specific structure and functions of each module are as follows: The water inlet pool module is used for homogenously and equally treating wastewater, and is internally provided with pH adjusting assembly and temperature adjusting device; the pH adjusting assembly comprises calcium carbonate and magnesium hydroxide composite adjusting agent with a mass ratio of 1:2.5; the temperature adjusting device adjusts the temperature of the wastewater to 25-35 DEG C through electric heating element; Micro-aerobic tank module: internally installed polyvinylidene fluoride (PVDF) material MBR membrane module, using cross-flow filtration method; intermittent aeration device is arranged at the bottom of the tank, and DO concentration monitor is arranged, when the dissolved oxygen concentration is higher than 0.5 mg / L, the aeration amount is automatically adjusted, nano iron oxide catalyst is added in the tank, and the anaerobic ammonia oxidation reaction is catalyzed, and the reaction equation is as follows: NH4 + +NO2 - =N2↑+2H2O; The water supplement pool module is used for supplementing ammonia nitrogen of the wastewater, and is internally provided with ammonia nitrogen concentration monitor and stirring paddle; when the ammonia nitrogen concentration is monitored to be lower than 100 mg / L, ammonium chloride solution is automatically added, and the stirring paddle is operated at a rotating speed of 60-90 r / min; the water supplement pool is provided with flow control device between the water supplement pool and the micro-aerobic pool, and when the sludge concentration of the micro-aerobic pool is greater than 5000 mg / L, the water supplement amount is adjusted to 80%-90% of the design flow; when the sludge concentration is less than 3000 mg / L, the water supplement amount is adjusted to 110%-120% of the design flow; The anoxic pool module is a further denitrification unit, and is internally provided with stirring device with a stirring speed of 100-150 r / min, carbon source adding device and oxidation-reduction potential (ORP) monitor; the carbon source adding device adds sodium acetate; The sedimentation and drainage pool module is a terminal treatment unit, and is internally provided with inclined pipe sedimentation assembly and sludge backflow device; The sludge backflow device returns the sedimentation sludge to the micro-aerobic pool at a backflow ratio of 50%-100%, the water quality monitor in the pool monitors the ammonia nitrogen index in real time, and the perforated sludge discharge pipe is arranged at the bottom of the pool.

2. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The system also comprises backwashing system, and 0.1-0.2 MPa compressed air is used to backwash the MBR membrane assembly for 10-15 minutes, the backwashing period is 2-4 hours, the dissolved oxygen concentration of the micro-aerobic pool is maintained at 0.2-0.5 mg / L during backwashing, and the washing water is discharged from the system through the membrane effluent pump.

3. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The water inlet pool is also provided with flocculant adding device, and polyaluminum chloride (PAC) is added, and the adding amount is 10-30 mg / L, so that the suspended solids in the wastewater are removed through flocculation to reduce the turbidity to below 10 NTU; the pool is also provided with ultrasonic liquid level meter, which monitors the water level in real time and links the water inlet valve.

4. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The micro-aerobic tank is provided with a temperature sensor. When the temperature is lower than 25℃, the temperature adjusting device of the water inlet tank adjusts the temperature at 1-2kW / m 3 power heating.

5. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The effective volume ratio of the anoxic pool to the micro-aerobic pool is 1:2, and biological filler is arranged in the pool, and the filler filling rate is 30%-40%.

6. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The surface load of the inclined tube precipitation assembly in the sedimentation drainage tank is 1.0-1.5 m 3 / (m 2 ·h), the precipitation time is 2-3 h, and the effluent SS is ensured to be ≤10 mg / L.

7. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The membrane flux of the MBR membrane module is controlled at 10-15 L / (m 2 h), the membrane filtration pressure is adjusted by the on-off frequency of the membrane outlet water pump, and the transmembrane pressure difference is maintained at ≤30 kPa.

8. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The water supplement pool is provided with auxiliary pH adjusting device, and when the pH of the wastewater after supplementing ammonia nitrogen is lower than 6.5, sodium hydroxide solution is automatically added to adjust the pH to 6.5-7.

0.

9. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, The outlet end of the sedimentation drainage tank is provided with an ultraviolet disinfection device with a power of 30-50W / m 3 The treated wastewater is disinfected to ensure that the fecal coliform group number of the effluent is less than or equal to 1000 / L.

10. The MBR membrane according to claim 1 applied to anammox wastewater treatment system, characterized by, When the system is integrated in an integrated device, each module in the device adopts carbon steel anticorrosive material, the volume ratio of the water inlet pool, micro-aerobic pool, water supplement pool, anoxic pool and sedimentation and drainage pool is 2:3:1:1.5:1.5, and the system is suitable for treating special wastewater with COD≤500 mg / L and ammonia nitrogen≤300 mg / L.

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