CN217600464U

CN217600464U - Composite membrane bioreactor

Info

Publication number: CN217600464U
Application number: CN202221109203.0U
Authority: CN
Inventors: 韩颖; 童方正; 徐婷; 张译霖; 张国禹; 朱学森; 周宁
Original assignee: Suzhou University
Current assignee: Suzhou University
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-10-18
Anticipated expiration: 2032-05-10

Abstract

The utility model belongs to the technical field of sewage treatment, and relates to a composite membrane bioreactor, which comprises an air supply unit, an aeration unit and a microorganism domestication unit; the air supply unit comprises a fan and an air supply pipeline; the aeration unit comprises a plurality of aeration devices; the microorganism domestication unit comprises a microorganism domestication pond and an aeration device arranged in the microorganism domestication pond; the aeration device comprises a bracket and a plurality of membrane components; the support is of a hollow structure, and one end of the support is communicated with the gas supply pipeline; the membrane module comprises a communicating component sleeved on the support and a plurality of hollow fiber membranes arranged between the communicating components, wherein two ends of each hollow fiber membrane are communicated with the inside of the support. The composite membrane bioreactor of the utility model can meet the basic pollution control performance, and the effluent quality is excellent and stable; meanwhile, the biological aggregation function of the biological filter can keep the river ecology stable, and greatly improve the sewage treatment efficiency.

Description

Composite membrane bioreactor

Technical Field

The utility model belongs to the technical field of sewage treatment, a complex film bioreactor is related to, be a fibre pipe enhancement mode hollow fiber composite biofilm reactor particularly.

Background

As water resources are increasingly scarce and the problem of water pollution is increasingly prominent, the demand for water is continuously increased, which causes a serious contradiction between supply and demand of water resources. Under the background, the water resource recycling is the only way for solving the contradiction between supply and demand, and the water treatment industry is determined to have the rigid demand attribute in a long time in the future, so that the potential is huge. The traditional water treatment mode can not adapt to various water pollution environments well, and a Membrane Bioreactor (MBR) is taken as a novel water treatment device which is formed by combining a Membrane separation unit and a biological treatment unit, a Membrane component replaces a secondary sedimentation tank to keep high active sludge concentration in the biological Reactor, so that the occupied area of a sewage treatment facility is reduced, and the sludge amount is reduced by keeping low sludge load. Compared with the traditional water treatment technology, the MBR technology has the following main characteristics: the treatment efficiency is high, and the effluent quality is good; the equipment is compact and the occupied area is small; automatic control is easy to realize, and operation management is simple. The core component of the MBR technology is a membrane module, and the main component of the membrane module is a hollow fiber membrane. The fiber tube reinforced hollow fiber membrane is adopted as a membrane component, the membrane casting solution is coated on the outer surface of the fiber tube and is prepared by taking the fiber tube as a support body, and the strength of the fiber membrane can be improved to the maximum extent while the separation performance of the fiber membrane is ensured.

In the prior art, a membrane bioreactor for river treatment is only a simple aeration and filtration technology, has no biological aggregation effect, cannot form a stable ecological system, and enables the river to recover self-cleaning capacity and keep clean for a long time. For example, CN201605180U discloses an integrated cross-flow hollow fiber membrane bioreactor, which comprises a membrane module and an aeration head, wherein the aeration head is arranged right below the membrane module, the exterior of the membrane module and the aeration head is sleeved with a flow inducing device, a vertically through flow inducing channel is formed between the flow inducing device and the membrane module and between the flow inducing device and the aeration head, and a gas flow meter is connected to a pipeline connecting the aeration head and a cross-flow aeration pump. The lower end of the flow inducing device is provided with a rectifying plate, and the rectifying plate is provided with a filtering hole. According to the technical scheme of the utility model, well control the membrane module, improve the membrane module suction characteristic, strengthen crisscross mobile shearing action to carry out the preliminary treatment to mud, further delay the pollution of membrane.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a complex film bioreactor when satisfying the basic pollution control performance, because of its biological gathering effect, can make the river course ecology remain stable, greatly improves the efficiency of administering sewage.

According to the technical scheme of the utility model, the composite membrane bioreactor comprises a gas supply unit, an aeration unit and a microorganism domestication unit;

the air supply unit comprises a fan and an air supply pipeline; the aeration unit comprises a plurality of aeration devices; the microorganism domestication unit comprises a microorganism domestication pool and an aeration device arranged in the microorganism domestication pool, and a microorganism throwing port is formed in the bottom of the microorganism domestication pool;

the aeration device comprises a bracket and a plurality of membrane components; the support is of a hollow structure, and one end of the support is communicated with the gas supply pipeline; the membrane component comprises a communicating component sleeved on the support and a plurality of hollow fiber membranes arranged between the communicating components, wherein two ends of each hollow fiber membrane are communicated with the inside of the support (holes are formed in the position, sleeved with the communicating component, of the support).

Specifically, the microorganism agent is used for in-situ culture of the microorganisms suitable for the riverway in the microorganism domestication pool, and the domesticated microorganisms are periodically put into the water body through the microorganism putting port.

Furthermore, the number of the fans is at least two; in one embodiment, two Roots blowers are provided, operating intermittently, one for each use.

Specifically, the fan is communicated with the gas storage tank to provide 0.01-0.8MPa of compressed gas for the composite membrane bioreactor, the compressed gas is adjusted to be at a proper pressure through the pressure reducing valve and then enters the gas supply pipeline, and the gas supply pressure and the flow of the system can be respectively adjusted according to actual requirements.

Furthermore, a plurality of aeration devices in the aeration unit are arranged in parallel.

Furthermore, in order to prevent the partial pressure of the overlong pipeline on each aeration device from being uneven, the site selection of the fan is placed at the middle end of the composite membrane bioreactor.

Further, the aeration unit comprises 20-50 aeration devices.

Further, the aeration device comprises 2-10 membrane modules.

Further, the membrane module comprises 200-600 hollow fiber membranes.

Further, the membrane area of the hollow fiber membrane of a single aeration device in the aeration unit is not less than 25m ² 。

In one embodiment, the aeration unit of the composite membrane bioreactor comprises 32 aeration devices, each aeration device comprises 8 membrane modules, each membrane module comprises 400 hollow fiber membranes, and the membrane area of the hollow fiber membranes of a single aeration device is 32m ² 。

Specifically, when the membrane component is prepared, one ends of a plurality of hollow fiber membranes are orderly arranged and are placed in a designed mould, one ends of the hollow fiber membranes are in contact with the bottom of the mould, and then the prepared epoxy resin glue is injected into the mould; after the glue is solidified, sawing the mould from the bottom end of the mould, and opening the hollow channel of the hollow fiber membrane solidified in the glue; finally, the sawn die and the matched communicating pipe die are fixedly sealed by glue, so that a final membrane assembly can be obtained; wherein the residual mold and the communicating pipe mold together form a communicating assembly.

Furthermore, when the support is of a one-way structure, the aeration pressure at the tail end is lower, the oxygen concentration is relatively low, and the defects of the annular structure are relatively small, so that one end of the support, which is far away from the gas supply pipeline, is annular, and the membrane assembly is arranged between the annular ends of the support.

Furthermore, a valve is arranged at one end of the support, which is connected with the gas supply pipeline, so that each aeration device can be independently controlled.

Further, the hollow fiber membrane comprises a hollow braided tube and a separation membrane arranged outside the hollow braided tube.

Furthermore, the hollow fiber membrane has strong hydrophilicity, is beneficial to better purifying a water source, and greatly improves the quality of effluent.

Compared with the prior art, the technical scheme of the utility model have following advantage:

(1) The effluent quality is excellent: the quality of the effluent water produced by the membrane bioreactor technology is excellent and stable, and suspended matters and turbidity are close to zero; compared with the traditional process, the method has certain advantages in the aspects of removing refractory organic matters, sterilizing, ecologically stabilizing and the like;

(2) The occupied area is small: the membrane bioreactor can maintain high-concentration microorganisms, the volume load of the disposal device is high, and the occupied area is greatly reduced compared with the traditional biological process;

(3) The water quality impact resistance is strong: due to the high-efficiency interception function of the membrane, microorganisms can be completely intercepted in the bioreactor, so that the interception, growth and reproduction of slowly-proliferating microorganisms in the reactor are facilitated, and the water impact resistance of the system is improved;

(4) The excess sludge is less: the composite membrane bioreactor operates under the conditions of high volume load, low sludge load and long sludge age, the sludge yield is low, and the sludge treatment cost can be reduced;

(5) The starting is convenient: the composite membrane bioreactor creates growth conditions for the detention and propagation of various microorganisms, enriches the microorganisms in the reactor, and shortens the acclimation period, so that the MBR (water treatment process) can be started and operated in a short time.

Drawings

FIG. 1 is a schematic diagram of a structure of a composite membrane bioreactor.

FIG. 2 is a schematic diagram of the structure of a membrane module.

Fig. 3 is a schematic structural view of a hollow fiber membrane.

Fig. 4 and 5 are front and back comparison graphs of water quality parameters of the composite membrane bioreactor used in a specific water environment.

FIG. 6 is a diagram of MBR process using a utility model composite membrane bioreactor.

Description of the reference numerals: 1-blower, 2-gas supply pipeline, 3-aeration device, 3.1-bracket, 3.2-membrane module, 3.21-communicating module, 3.22-hollow fiber membrane, 4-microorganism domestication pool, 4.1-microorganism putting port, 5-valve, 6-grid, 7-sand settling pool, 8-primary settling pool, 9-composite membrane bioreactor, 10-disinfection pool.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not limited to the present invention.

As shown in fig. 1: the utility model discloses complex film bioreactor, including air feed unit, aeration unit and microorganism domestication unit.

Wherein, the air supply unit comprises a fan 1 and an air supply pipeline 2, and is used for supplying air to the composite membrane bioreactor. The aeration unit comprises several aeration devices 3 (shown as 1). The microorganism domestication unit comprises a microorganism domestication pool 4 and an aeration device 3 arranged in the microorganism domestication pool 4, and a microorganism throwing port 4.1 is formed in the bottom of the microorganism domestication pool 4 and used for throwing in domesticated microorganisms.

The aeration device 3 comprises a bracket 3.1 and a plurality of membrane components 3.2. The support 3.1 is of a hollow structure, one end of the support 3.1 is provided with a valve 5 and communicated with the gas supply pipeline 2, one end of the support 3.1 is rectangular, and the membrane components 3.2 are uniformly arranged in the rectangle. The membrane component 3.2 comprises a communicating component 3.21 sleeved on the bracket 3.1 and a plurality of hollow fiber membranes 3.22 arranged between the communicating components 3.21, and two ends of the hollow fiber membranes 3.22 are communicated with the inside of the bracket 3.1.

Conceivably, the bracket 3.1 can also be in a U shape, an S shape and the like, and can be made of metal such as alloy and the like or material with higher strength; the hollow fiber membranes 3.22 may also be attached to the stent in a wound manner.

As shown in fig. 3: the hollow fiber membrane 3.22 comprises a hollow braided tube and a separation membrane arranged outside the hollow braided tube, and can be prepared by uniformly and flatly coating a casting solution (sold in the market) on the surface of the pretreated braided tube by taking pvdf (polyvinylidene fluoride) as a raw material and a polyester braided tube as a reinforcement and adopting a spinning nozzle coating device.

The utility model discloses in, complex film bioreactor can put in one or more according to the particular case that needs purified the water source when using. When a plurality of reactors are charged, the reactors may be connected together by a rope.

As shown in fig. 6, in the MBR process using the device of the utility model, the water source is passed through the grating 6 and is entered into the sediment tank 7 to filter the sediment impurities in the water, and then is passed through the primary sedimentation tank 8 to carry out the second sedimentation and filtration, and then is passed through the composite membrane bioreactor 9 to filter the small molecular substances (the filtering effect is shown in fig. 4 and 5), and finally enters the disinfection tank 10 to obtain high-quality water after disinfection.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.

Claims

1. A composite membrane bioreactor is characterized by comprising an air supply unit, an aeration unit and a microorganism domestication unit;

the air supply unit comprises a fan (1) and an air supply pipeline (2); the aeration unit comprises a plurality of aeration devices (3); the microorganism domestication unit comprises a microorganism domestication pond (4) and an aeration device (3) arranged in the microorganism domestication pond (4), and a microorganism throwing port (4.1) is formed in the bottom of the microorganism domestication pond (4);

the aeration device (3) comprises a bracket (3.1) and a plurality of membrane components (3.2); the support (3.1) is of a hollow structure, and one end of the support (3.1) is communicated with the gas supply pipeline (2); the membrane component (3.2) comprises communicating components (3.21) sleeved on the support (3.1) and a plurality of hollow fiber membranes (3.22) arranged between the communicating components (3.21), and two ends of each hollow fiber membrane (3.22) are communicated with the inside of the support (3.1).

2. A composite membrane bioreactor as claimed in claim 1, wherein the fans (1) are at least two arranged in parallel.

3. A composite membrane bioreactor as claimed in claim 1, wherein several aeration devices (3) in the aeration unit are arranged in parallel.

4. A composite membrane bioreactor as claimed in claim 1 or 3, wherein the aeration unit comprises 20-50 aeration devices (3).

5. A composite membrane bioreactor as claimed in claim 1, wherein the aeration device (3) comprises 2-10 membrane modules (3.2).

6. Composite membrane bioreactor as claimed in claim 1, wherein the membrane modules (3.2) comprise 200-600 hollow fiber membranes (3.22).

7. The composite membrane bioreactor as claimed in claim 1, wherein the membrane area of the hollow fiber membranes (3.22) of a single aeration device (3) in the aeration unit is not less than 25m ² 。

8. Composite membrane bioreactor as claimed in claim 1, characterized in that the end of the support (3.1) remote from the gas supply line (2) is annular and the membrane module (3.2) is arranged between the annular ends of the support (3.1).

9. A composite membrane bioreactor as claimed in claim 1, wherein a valve (5) is provided at the end of the support (3.1) connected to the gas supply line (2).

10. Composite membrane bioreactor as claimed in claim 1, characterized in that the hollow fiber membranes (3.22) comprise a hollow braided tube and a separation membrane arranged outside the hollow braided tube.