CN113880253A

CN113880253A - Aerobic granular sludge reactor and sewage treatment method

Info

Publication number: CN113880253A
Application number: CN202111323435.6A
Authority: CN
Inventors: 陈翰
Original assignee: Beijing Enterprises Water China Investment Co Ltd
Current assignee: Beijing Enterprises Water China Investment Co Ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-01-04

Abstract

The embodiment of the application discloses an aerobic granular sludge reactor and a sewage treatment method, wherein the aerobic granular sludge reactor comprises a reactor body and a membrane aeration unit; the membrane aeration unit comprises an oxygenation membrane wire assembly arranged inside the reactor body and a first aeration branch pipe used for aerating the interior of the oxygenation membrane wire assembly, and the surface of the oxygenation membrane wire is used for attaching to form a biological membrane; the bottom of oxygenating membrane silk subassembly has the distance with the bottom of reactor body between the interval, installs second aeration branch pipe in the spaced distance, be equipped with the aeration hole on the second aeration branch pipe, be used for making the biomembrane is followed the surface of oxygenating membrane silk drops. The reactor provided by the embodiment of the application integrates aeration and a biological membrane by adopting the oxygenation membrane wire assembly, accelerates the formation of aerobic granular sludge, and improves the oxygen transfer efficiency.

Description

Aerobic granular sludge reactor and sewage treatment method

Technical Field

The application relates to the technical field of wastewater treatment, in particular to an aerobic granular sludge reactor and a sewage treatment method.

Background

The aerobic granular sludge is a granular sludge aggregate formed by spontaneous condensation of microorganisms under aerobic conditions, has an aerobic/anoxic/anaerobic compact layered space structure, can simultaneously carry out nitrification, denitrification and phosphorus removal processes, has the advantages of rapid sludge sedimentation, strong impact load resistance, high pollutant removal efficiency and the like, can conveniently realize synchronous removal of carbon, nitrogen and phosphorus and efficient sludge-water separation under the same tank body, and can save the common investment of internal and external reflux, secondary sedimentation tank and the like in the traditional process on the premise of ensuring that the effluent reaches the standard.

Because the seed sludge source of the aerobic granular sludge is limited, the formation of the aerobic granular sludge at the present stage mainly depends on the in-situ granular culture of flocculent activated sludge, the culture condition is harsh and needs a longer start-up period, and the application of the aerobic granular sludge in sewage treatment is greatly limited.

Therefore, the research on the aerobic granular sludge needs to be further deepened at present.

Disclosure of Invention

In view of the above-mentioned defects or shortcomings in the prior art, the present application is directed to provide an aerobic granular sludge reactor and a sewage treatment method, wherein the reactor has a short aerobic granular sludge formation period and a high sewage degradation efficiency.

As a first aspect of the present application, there is provided an aerobic granular sludge reactor.

Preferably, the aerobic granular sludge reactor comprises: a reactor body and a membrane aeration unit;

the membrane aeration unit comprises an oxygenation membrane wire assembly arranged inside the reactor body and a first aeration branch pipe used for aerating the interior of the oxygenation membrane wire assembly, and the surface of the oxygenation membrane wire is used for attaching to form a biological membrane;

the bottom of oxygenating membrane silk subassembly has the distance with the bottom of reactor body between the interval, installs second aeration branch pipe in the spaced distance, be equipped with the aeration hole on the second aeration branch pipe, be used for making the biomembrane is followed the surface of oxygenating membrane silk drops.

Preferably, the number of the oxygenated membrane wire assemblies is multiple, and the multiple oxygenated membrane wire assemblies are arranged on the inner wall of the reactor body at intervals around the inner wall.

Preferably, the plurality of oxygenated membrane wire assemblies are arranged in one or more layers along the inner wall.

Preferably, the second aeration branch pipe is arranged around the inner wall of the reactor body, the number of the aeration holes is multiple, and each oxygenation membrane wire assembly corresponds to the plurality of aeration holes below the oxygenation membrane wire assembly.

Preferably, the oxygenated membrane filaments are hollow fiber membrane filaments.

Preferably, the hollow fiber membrane filaments have a membrane pore diameter of 0.01 to 0.5 μm and a porosity of 30 to 90%.

Preferably, the membrane aeration device also comprises a micropore aeration unit connected with the membrane aeration unit in parallel;

the microporous aeration unit comprises a diffuser arranged between the bottom of the reactor body and the second aeration branch pipe, and the surface of the diffuser is provided with a plurality of aeration micropores.

Preferably, the aerator further comprises a blower, and the first branch aerator pipe, the second branch aerator pipe and the diffuser are connected with the blower through independent gas circuit valves and flow meters.

Preferably, at least one of a dissolved oxygen monitoring device, a pH monitoring device, an ammonia nitrogen monitoring device and a nitrate nitrogen monitoring device which are controlled by a control system are arranged in the reactor body.

As a second aspect of the present application, there is provided a method for sewage treatment using an aerobic granular sludge reactor as described above.

Preferably, the sewage treatment method comprises the following steps:

inoculating flocculent sludge into a reactor body with sewage;

aerating the oxygen charging membrane wire assembly and keeping the set air supply flow, and/or aerating the reactor body through a diffuser;

periodically leading the biological membrane formed on the surface of the oxygen charging membrane wire to fall off in the aeration process or after the aeration is finished, and promoting the formation of aerobic granular sludge.

Has the advantages that:

the reactor provided by the embodiment of the application integrates aeration and a biological membrane by adopting the oxygenation membrane wire assembly, so that the formation of aerobic granular sludge is accelerated, and the oxygen transfer efficiency is improved;

the reactor that this application embodiment provided is through setting up micropore aeration unit for the reactor possesses two aeration systems, can adopt multi-mode operation according to actual conditions.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of an aerobic granular sludge reactor according to an embodiment of the present application;

FIG. 2 is a schematic illustration of the formation of aerobic granular sludge according to one embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting.

It should be noted that in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

According to a first aspect of the present application, please refer to fig. 1, which shows an aerobic granular sludge reactor of a preferred embodiment of the present application, comprising a reactor body 1 and a membrane aeration unit, the membrane aeration unit comprising an oxygenated membrane wire assembly 20 arranged inside the reactor and a first aeration branch 21 for aerating the inside of the oxygenated membrane wire assembly 20, the surface of the oxygenated membrane wire being used for attachment of biofilm;

the bottom of the oxygenation membrane silk subassembly 20 and the bottom of the reactor body 1 are separated by a distance, a second aeration branch pipe 3 is installed in the separated distance, and an aeration hole is formed in the second aeration branch pipe 3 and used for enabling the biomembrane to fall off from the surface of the oxygenation membrane silk.

Specifically, the oxygen charging membrane wire assembly 20 is used as a medium for charging oxygen into the reactor body 1 or supplying oxygen, so as to realize high mass transfer efficiency oxygen supply, and is used as a carrier for hanging a membrane on the surface of the oxygen charging membrane wire, so that microorganisms in the sewage can hang a membrane on the surface of the oxygen charging membrane wire, so as to form a stable biological membrane, and the biological membrane can be used as a condensation center or a precursor of flocculent sludge after falling off, so as to accelerate the formation of aerobic granular sludge, and can degrade pollutants in the sewage, so as to realize the purification of the sewage;

more specifically, oxygen or air enters the inside of the oxygenation membrane wire assembly 20 through the first aeration branch pipe 21, and the oxygen is utilized by microorganisms on the surface of the oxygenation membrane wire, so that the propagation speed of the microorganisms on the surface of the oxygenation membrane wire can be increased, and the formation of a biological membrane is facilitated;

after the biofilm accumulation reaches a certain amount or the reactor runs for a certain period, oxygen or air enters the reactor body 1 through the aeration holes of the second aeration branch pipe 3, the airflow moves upwards to impact the biofilm and enable sewage to form shearing force around the oxygenation membrane wire assembly 20 below the oxygenation membrane wire assembly, the biofilm is promoted to fall off from the surface of the oxygenation membrane wire under the combined action of the air and the water, as shown in fig. 2, the fallen biofilm is used as a precursor for forming granular sludge and provides a condensation center for flocculent sludge, aerobic granular sludge is promoted to be quickly formed, and the culture period of the granular sludge is remarkably shortened; the reactor body 1 is aerated periodically through the second aeration branch pipes 3, so that the periodic updating and replacement of the biological membrane are realized, and microbial particles are continuously provided in the subsequent continuous operation, so that the biological membrane, aerobic granular sludge and flocculent sludge coexist, and the reactor can stably operate;

compared with flocculent sludge, the biomembrane formed and fallen on the surface of the oxygen charging membrane wire is more beneficial to enriching ammonia oxidizing bacteria, nitrite oxidizing bacteria, phosphorus accumulating bacteria and other bacteria with relatively slow proliferation, and is beneficial to forming aerobic granular sludge with stable structure, and can ensure the removal of pollutants such as ammonia nitrogen, total phosphorus and the like while accelerating the granulation process.

The reactor of the embodiment can be used as a device for culturing aerobic granular sludge to realize the rapid formation of the aerobic granular sludge on one hand, and can be used as a sewage treatment device to realize the high-efficiency stable purification of sewage by forming various biomass staying forms of 'biomembrane + flocculent sludge + aerobic granular sludge' in the sewage treatment process on the other hand; specifically, at the initial stage of starting the reactor, a biological membrane is continuously formed on the surface of the oxygenation membrane wire assembly 20, the biological membrane and flocculent sludge are mainly taken as main materials in the reactor body 1 and are accompanied by a small amount of aerobic granular sludge, and pollutants are mainly removed by the biological membrane and the flocculent sludge; in the middle stage of the operation of the reactor, the biomembrane, aerobic granular sludge and flocculent sludge are gradually formed through the periodic falling of the biomembrane; in the later stage of the operation of the reactor, aerobic granular sludge is taken as a main part in the reactor body 1, a biological membrane is taken as an auxiliary part, pollutants are removed mainly by the aerobic granular sludge, and the stable quality of effluent water during debugging, starting and operation faults is ensured through effective retention and various retention forms of biomass in the reactor.

It will be appreciated that other mechanical structures may be provided in the reactor body 1 to promote the biofilm detachment from the surface of the oxygenated membrane filaments, such as a stirrer or a vibrator, which causes the wastewater to generate shear forces that promote the biofilm detachment.

Further, in some preferred embodiments of the present application, the opening direction of the aeration hole is toward the oxygenation membrane wire assembly 20, so as to better promote the shedding of the biological membrane.

Further, in some preferred embodiments of the present application, the number of the oxygenating membrane wire assemblies 20 is plural, and a plurality of the oxygenating membrane wire assemblies 20 are arranged around the inner wall of the reactor body 1 at intervals thereon.

Specifically, the oxygenating membrane wire assembly 20 includes a bracket in which the oxygenating membrane wire is fixed or filled, wherein the bracket may be connected to the inner wall of the reactor body 1 by any suitable means, such as by fasteners, welding, fusion, adhesives, etc., without being limited thereto. The shape of the bracket is not limited, and the bracket can be processed into a rectangle, a sphere or an ellipse according to the process requirement.

Set up through making the membrane silk subassembly 20 of oxygenating encircle reactor body 1 inner wall interval to guarantee the homogeneity of oxygen suppliment and the homogeneity of scattering of good oxygen granule mud in reactor body 1, guarantee the pollutant and get rid of the effect.

Further, in some preferred embodiments of the present application, the plurality of oxygenated membrane wire assemblies 20 are arranged in one or more layers along the inner wall.

Specifically, in the radial direction of the reactor body 1, the plurality of oxygenated membrane wire assemblies 20 are arranged in one or more layers, such as one layer, two layers or three layers …, to improve the contaminant removal effect.

Further, in some preferred embodiments of the present application, the second branch aeration pipe 3 is disposed around the inner wall of the reactor body 1, the number of the aeration holes is plural, and each of the oxygenation membrane wire assemblies 20 corresponds to the plural aeration holes located therebelow.

Specifically, the second aeration branch pipe 3 has a plurality of aeration holes, each of which is uniformly or non-uniformly arranged, or uniformly arranged according to the position of the oxygenation membrane wire assembly 20 in a preset rule, wherein each oxygenation membrane wire assembly 20 respectively corresponds to a plurality of aeration holes located therebelow, for example, 3, 4, 5 or 10, and the like, and is commonly aerated towards the same oxygenation membrane wire assembly 20 through the plurality of aeration holes to promote the effective falling of the biofilm; wherein, when a plurality of oxygenation membrane silk subassemblies 20 arrange for the multilayer, each layer oxygenate the below of membrane silk subassembly 20 and all set up second aeration branch pipe 3, be provided with multiunit second aeration branch pipe 3 in the reactor body 1 promptly.

Further, in some preferred embodiments of the present application, the oxygenated membrane filaments are hollow fiber membrane filaments.

The hollow fiber membrane has tiny pores, can supply oxygen to microorganisms without bubbles, can greatly improve the total amount of microorganisms and the oxygen utilization rate in unit water body, strengthens the water body purification efficiency, can improve the oxygen utilization rate, reduces the aeration energy consumption and saves the total aeration operation cost of the system.

Further, in some preferred embodiments of the present invention, the hollow fiber membrane filaments have a membrane pore size of 0.01 to 0.5 μm and a porosity of 30 to 90%.

The membrane aperture and the porosity influence the flux of the hollow fiber membrane filaments, the smaller the membrane aperture diameter is, the smaller the diameter of generated bubbles is, the larger the specific surface area is, the slower the rising speed is, the longer the retention time in sewage is, the gas-liquid mass transfer time can be increased, and the higher oxygen mass transfer efficiency is shown; wherein, the membrane flux is reduced and the oxygen supply capacity is reduced due to the undersize of the membrane aperture and the porosity, so that the pollutant removal effect is influenced; the membrane pore diameter is too large, macromolecular substances can easily enter micropores to generate blockage, the porosity is too large, the self-supporting effect of the hollow fiber membrane yarn is reduced, and the hollow fiber membrane yarn cannot stably exist in a reactor; wherein the pore diameter of the membrane is preferably 0.1-0.4 μm, more preferably 0.2-0.3 μm; the porosity is preferably 45 to 80%, more preferably 55 to 70%.

Wherein, the number of the oxygenation membrane silk assemblies 20 and the effective area of the oxygenation membrane silk are related to the pollutant content of the sewage to be treated and the water outlet requirement.

Further, in some preferred embodiments of the present application, a microporous aeration unit connected in parallel with the membrane aeration unit is further included;

the micro-porous aeration unit comprises a diffuser 40 disposed between the bottom of the reactor body 1 and the second aeration branch pipe 3, and a plurality of aeration micro-pores arranged at intervals are disposed on the diffuser 40, wherein the number of the aeration micro-pores may be tens, hundreds or thousands.

Specifically, the diffuser 40 of the present application is a microporous diffuser having aeration micropores generally 3mm or less in diameter, and oxygen or air forms minute bubbles generally 3mm or less in diameter through the diffuser 40; the reactor of the embodiment of the application has double aeration units, so that on one hand, the advantages of the two treatment processes are complementary, a more sufficient synchronous nitrification and denitrification environment is provided for an aerobic granular sludge system, and on the other hand, a proper aeration operation mode can be selected in real time under the condition of maintaining stable operation of sewage treatment according to debugging and operation requirements, so that the aeration energy consumption is saved, and the operation cost is reduced; the diffuser 40 may be a tube, a plate, or a disc, and the present application is not limited thereto.

Wherein the micro porous aeration unit further comprises a third aeration branch pipe 41 in gas communication with the diffuser 40, and a plurality of diffusers 40 are uniformly or non-uniformly spaced on the third aeration branch pipe 41.

Further, in some preferred embodiments of the present application, the aeration holes of the second branch aeration pipe 3 have a larger diameter than the aeration micro-holes, the aeration holes of the second branch aeration pipe 3 are used to form bubbles with a relatively large diameter, for example, 10mm or more, to ensure that a sufficiently strong shearing force is formed to the microbial membrane, and the oxygen supply capacity thereof is poor, and the aeration micro-holes are used to form micro-bubbles with a diameter of typically 3mm or less, and the oxygen supply capacity thereof is relatively strong.

Further, in some preferred embodiments of the present application, a blower is further included, and the first and second aeration branch pipes 21 and 3 and the diffuser 40 are connected to the blower through a separate gas path valve 6 and a flow meter 7.

Specifically, the blower inputs compressed air into the first branch aerator pipe 21, the second branch aerator pipe 3 and the third branch aerator pipe 41, the start-stop and aeration quantity of corresponding units can be controlled according to the process requirements through the independent gas circuit valves 6 so as to adjust the biofilm thickness, dominant bacteria and dissolved oxygen, and the gas flow of each gas circuit can be monitored in real time through the independent flow meters 7.

The blower can be an air suspension blower, a magnetic suspension blower or a Roots blower, has a flow regulating function, can automatically or manually regulate total aeration flow output according to needs, and provides dissolved oxygen supply and uniform mixing environment for sludge mixed liquid in a process aeration reaction stage.

Further, in some preferred embodiments of the present application, a first blower 51 and a second blower 52 are included, wherein the first blower 51 can be connected to the first aeration branch 21 and the third aeration branch 41 through the aeration main 8, so that the air output from the first blower 51 enters each unit through the aeration main 8. The second blower fan 52 is connected to the second aeration manifold 3. The gas flow rate of the second blower 52 is larger than that of the first blower 51, so that large bubbles with strong shearing force are formed to promote the shedding of the biological membrane.

Further, in some preferred embodiments of the present application, at least one of a dissolved oxygen monitoring device, a pH monitoring device, an ammonia nitrogen monitoring device and a nitrate nitrogen monitoring device controlled by a control system is further disposed in the reactor body 1, so that a change condition of a relevant index in the reactor body can be monitored in real time, and automatic online feedback regulation and control can be realized; wherein the control system may be a PLC control system (not shown in the figure).

Further, the reactor also comprises a water inlet unit, a water discharge unit and a sludge discharge unit (not shown in the figure), sewage to be treated enters the reactor body through the water inlet unit, the sewage after purification treatment is discharged through the water discharge unit, and the sludge discharge unit is used for discharging flocculent sludge with lower settling speed;

the water inlet unit comprises a water inlet pump and a water inlet pipeline and is connected with a water inlet arranged at the bottom of the reactor body 1; the drainage unit comprises a drainage pump and a drainage pipeline and is connected with a drainage port arranged at the middle upper part of the reactor body 1; the sludge discharge unit comprises a sludge discharge pump and a sludge discharge pipeline and is connected with a sludge discharge port arranged at the middle upper part of the reactor body 1; the reactor can be operated in a bottom water inlet synchronous water outlet mode and also in a bottom water inlet step-by-step water outlet mode, and the application is not limited.

Furthermore, a water distributor (not shown in the figure) is also arranged in the reactor body 1 and is positioned above the water inlet; wherein, the distance between the bottom of the oxygenation membrane wire component 20 and the water distributor and the diffuser 40 is kept at least more than 1.5m, so as to avoid influencing the attachment of the biological membrane during water inlet and micropore aeration.

The reactor provided by the embodiment of the application integrates aeration and biological membrane by adopting the oxygenation membrane wire assembly 20, so that the oxygen transfer efficiency is improved;

the second aeration branch pipe 3 is arranged below the oxygen charging membrane wire assembly, so that a biological membrane can fall off conveniently by adopting an air washing method, the biological membrane is promoted to be updated, aerobic granular sludge is formed, and under the same water quality condition, the time for culturing granular sludge by the reactor can be shortened by 10-30% compared with that of a device or a method in the prior art, and the water quality standard reaching time in a debugging period can be shortened by 20-40%; furthermore, the particle size of the aerobic granular sludge formed by the reactor is 200-2000 μm, the concentration can reach 5000-8000mg/L, compared with the flocculent sludge, the aerobic granular sludge has the advantages of large particle size and rapid sedimentation, and the volume index SVI of the aerobic granular sludge is lower than 50mL/g and far lower than the volume index (100-200mL/g) of the aerobic granular sludge formed by the device or the method in the prior art.

Through setting up micropore aeration unit for the reactor possesses two aeration systems, can adopt multi-mode operation according to actual conditions.

Further, the present application discloses a method for sewage treatment using the aerobic granular sludge reactor as described above, comprising:

inoculating flocculent sludge into a reactor body with sewage;

Specifically, sewage enters the reactor body 1 through the water inlet unit, after ordinary flocculent sludge is inoculated in the reactor body 1 according to a set proportion, the opening of the gas circuit valve 6 of the first aeration branch pipe 21 of the membrane aeration unit is regulated and controlled according to actual conditions, microorganisms are promoted to be attached and grown on the surface of the oxygenation membrane wire assembly 20 by aerating the oxygenation membrane wire assembly 20, or the gas circuit valve 6 of the third aeration branch pipe 41 of the microporous aeration unit is controlled to be opened, the through hole diffuser 40 aerates the inside of the reactor body 1, or the gas circuit valve 6 of the first aeration branch pipe 21 and the gas circuit valve 6 of the third aeration branch pipe 41 are simultaneously controlled to be opened, and double aeration is carried out;

when the biofilm hanging condition on the surface of the oxygen charging membrane wire component 20 meets the requirement, the second aeration branch pipe 3 is periodically controlled to be opened at the aeration reaction stage or after the aeration is finished, the aeration towards the oxygen charging membrane wire component 20 promotes the biofilm to fall off and enter the reactor main body 1, the biofilm continuously collides with flocculent sludge and aerobic granular sludge in the aeration process, and the aerobic granular sludge precursor is gradually changed into aerobic granular sludge with uniform shape and compact structure; adjusting the selective pressure of the sedimentation speed of the flocculent sludge in real time according to the running condition of the reactor and the sewage treatment condition, and discharging the flocculent sludge with the sedimentation speed lower than the preset selective pressure through a sludge discharge unit;

and monitoring the change condition of relevant indexes in the reactor body in real time, and discharging the sewage through the drainage unit after the sewage is purified to reach the standard.

The aerobic granular sludge reactor is adopted to treat domestic sewage with COD of 200 and 400mg/L, wherein the concentration value of ammonia nitrogen in the sewage is 30-50mg/L, the concentration value of total nitrogen is 40-60mg/L, the concentration value of total phosphorus is 3-5mg/L, after the treatment, the COD of the effluent is 20-40mg/L, the ammonia nitrogen concentration value is 0-1mg/L, the total nitrogen concentration value is 8-13mg/L, the total phosphorus concentration value is 0-0.4mg/L, the treatment effect is better, wherein the grain diameter of the formed aerobic granular sludge is 200-2000 mu m, the volume index SVI of the aerobic granular sludge is lower than 50mL/g, the concentration of the sludge granular sludge is about 5000-8000mg/L, and the water quality standard reaching time is shortened by 20-40 percent compared with the prior sludge reactor.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An aerobic granular sludge reactor, comprising: a reactor body and a membrane aeration unit;

2. The aerobic granular sludge reactor according to claim 1 wherein the number of the oxygenating membrane wire assemblies is plural, and a plurality of oxygenating membrane wire assemblies are arranged on the inner wall of the reactor body at intervals around the inner wall.

3. The aerobic granular sludge reactor according to claim 2 wherein a plurality of membrane wire assemblies are arranged in one or more layers along the inner wall.

4. The aerobic granular sludge reactor as claimed in claim 2, wherein the second branch aerator pipe is disposed around the inner wall of the reactor body, the number of the aeration holes is plural, and each membrane oxygenation assembly corresponds to the plural aeration holes thereunder.

5. The aerobic granular sludge reactor according to claim 1 wherein the oxygenated membrane filaments are hollow fiber membrane filaments.

6. The aerobic granular sludge reactor as claimed in claim 5, wherein the hollow fiber membrane filaments have a membrane pore size of 0.01 to 0.5 μm and a porosity of 30 to 90%.

7. The aerobic granular sludge reactor as claimed in claim 1, further comprising a micro-pore aeration unit connected in parallel with the membrane aeration unit;

8. The aerobic granular sludge reactor as claimed in claim 7, further comprising a blower, wherein the first branch aerator, the second branch aerator and the diffuser are connected to the blower through separate gas path valves and flow meters.

9. The aerobic granular sludge reactor as claimed in claim 1, wherein at least one of a dissolved oxygen monitoring device, a pH monitoring device, an ammonia nitrogen monitoring device and a nitrate nitrogen monitoring device is further provided in the reactor body and controlled by the control system.

10. A sewage treatment method using the aerobic granular sludge reactor according to any one of claims 1 to 9, comprising:

inoculating flocculent sludge into a reactor body with sewage;