CN217600464U - Composite membrane bioreactor - Google Patents

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

A composite membrane bioreactor

technical field

The utility model belongs to the technical field of sewage treatment, and relates to a composite membrane biological reactor, in particular to a fiber tube reinforced hollow fiber composite biological membrane reactor.

Background technique

Due to the increasing scarcity of water resources and the increasingly prominent problem of water pollution, the demand for water continues to increase, which has resulted in a serious contradiction between supply and demand of water resources. In this context, the recycling of water resources is the only way to solve the contradiction between supply and demand, which determines that the water treatment industry will have a rigid demand attribute in the future, with huge potential. Traditional water treatment methods have been unable to adapt to various water pollution environments. Membrane Bio-Reactor (MBR) is a new type of water treatment equipment that combines membrane separation unit and biological treatment unit. Replacing the secondary sedimentation tank with membrane modules to maintain a high activated sludge concentration in the bioreactor reduces the footprint of the sewage treatment facility and reduces the amount of sludge by keeping the sludge load low. Compared with traditional water treatment technology, MBR technology has the following main characteristics: high treatment efficiency, good effluent quality; compact equipment, small footprint; easy to achieve automatic control, simple operation and management. The core component of MBR technology is the membrane module, and the main component of the membrane module is the hollow fiber membrane. The fiber tube reinforced hollow fiber membrane is used as the membrane module, and the casting liquid is coated on the outer surface of the fiber tube and made of the fiber tube as the support, which can ensure the separation performance of the fiber membrane and maximize the improvement of the fiber membrane. Strength of.

In the current technology, the membrane bioreactor used for river treatment is only a simple aeration and filtration technology, without biological aggregation, it cannot form a stable ecosystem, so that the river can restore its self-purification ability and keep it clean for a long time. For example, CN201605180U discloses an integrated cross-flow hollow fiber membrane bioreactor, which includes a membrane module and an aeration head. The aeration head is located directly below the membrane module. The membrane module and the aeration head are sleeved with a flow induction device. The flow induction device A flow-inducing channel that runs up and down is formed between the membrane module and the aeration head, and a gas flow meter is connected to the pipeline connecting the aeration head and the cross-flow aeration pump. The lower end of the flow inducing device is provided with a rectifier plate, and the rectifier plate is provided with filter holes. According to the technical scheme of the utility model, the membrane module is well controlled, the suction characteristics of the membrane module are improved, the shearing effect of the cross flow is strengthened, and the sludge is pretreated to further delay the pollution of the membrane.

Utility model content

The utility model aims to provide a composite membrane bioreactor, which can keep the river ecology stable and greatly improve the efficiency of sewage treatment due to its biological aggregation effect while satisfying the basic pollution control performance.

According to the technical scheme of the present utility model, the composite membrane bioreactor includes an air supply unit, an aeration unit and a microorganism acclimation unit;

The air supply unit includes a fan and an air supply pipeline; the aeration unit includes several aeration devices; the microorganism domestication unit includes a microorganism domestication pool and an aeration device arranged in the microorganism domestication pool, the microorganism domestication pool There is a microbial injection port at the bottom of the device;

The aeration device includes a bracket and several membrane assemblies; the bracket is a hollow structure, and one end of the bracket is connected to the air supply pipeline; the membrane assembly includes a communication component sleeved on the bracket and a There are several hollow fiber membranes between the modules, and both ends of the hollow fiber membranes communicate with the inside of the bracket (a hole is opened on the bracket at the position where the communication module is sleeved).

Specifically, microorganisms suitable for the river channel are cultivated in situ in the microorganism acclimation tank using microbial inoculants, and the domesticated microorganisms are regularly injected into the water body through the microorganism injection port.

Further, there are at least two fans arranged in parallel; in one embodiment, two Roots fans are equipped, which operate intermittently, one for standby and one for use.

Specifically, the fan is connected to the gas storage tank to provide compressed gas of 0.01-0.8MPa for the composite membrane bioreactor, which is adjusted to an appropriate pressure through the pressure reducing valve and then enters the gas supply pipeline, and the gas supply pressure and flow.

Further, several aeration devices in the aeration unit are arranged in parallel.

Further, in order to prevent the uneven partial pressure of each aeration device due to the long pipeline, the location of the fan is placed at the middle end of the composite membrane bioreactor.

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

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

Further, the membrane module includes 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 25 m ² .

In one embodiment, the aeration unit of the composite membrane bioreactor includes 32 aeration devices, each aeration device includes 8 membrane modules, each membrane module includes 400 hollow fiber membranes, and the hollow fibers of a single aeration device The membrane area of the membrane was 32 m ² .

Specifically, during the preparation of the membrane module, one end of several hollow fiber membranes is neatly arranged and placed in the designed mold, so that one end touches the bottom of the mold, and then the prepared epoxy resin glue is injected into the mold; the glue is cured After that, the mold is sawed from the bottom end of the mold, and the hollow channel of the hollow fiber membrane solidified in the glue will be opened; finally, the sawed mold and the matching connecting pipe mold are sealed with glue to obtain the final Membrane assembly; wherein the residual mold and the connecting pipe mold together constitute the connecting assembly.

Further, when the support is a one-way structure, the aeration pressure at the end is relatively low, the oxygen concentration is relatively low, and the annular structure is relatively small in defects, therefore, the support is far away from the air supply pipeline. One end is annular, and the membrane assembly is arranged between the annular ends of the support.

Further, a valve is provided at one end of the bracket connected to the air supply pipeline, so that each aeration device can be independently controlled.

Further, the hollow fiber membrane includes a hollow braided tube and a separation membrane disposed outside the hollow braided tube.

Further, the hollow fiber membrane has strong hydrophilicity, which is conducive to better purification of the water source and greatly improves the quality of the effluent.

Compared with the prior art, the technical solution of the present utility model has the following advantages:

(1) Excellent effluent quality: The effluent quality of membrane bioreactor technology is excellent and stable, with suspended solids and turbidity close to zero; it has certain advantages compared with traditional processes in terms of removal of refractory organic matter, disinfection and ecological stability;

(2) Small footprint: The membrane bioreactor can maintain a high concentration of microorganisms, and the volume load of the disposal device is high, and the footprint is greatly reduced compared with traditional biological processes;

(3) Strong resistance to water impact: due to the efficient retention of the membrane, microorganisms can be completely trapped in the bioreactor, which is conducive to the interception, growth and reproduction of slow-proliferating microorganisms in the reactor, so that the system can withstand water impact. improve;

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

(5) Easy to start: The composite membrane bioreactor creates growth conditions for the residence and reproduction of various microorganisms, enriches the microbial phase in the reactor, and shortens the domestication period, so that the MBR (water treatment process) can be used in a short period of time. Start running.

Description of drawings

Figure 1 is a schematic structural diagram of a composite membrane bioreactor.

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

FIG. 3 is a schematic structural diagram of a hollow fiber membrane.

Figures 4 and 5 are comparison diagrams of the water quality parameters before and after the composite membrane bioreactor is used in a specific water environment.

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

Description of reference numerals: 1-fan, 2-air supply pipeline, 3-aeration device, 3.1-support, 3.2-membrane module, 3.21-communication module, 3.22-hollow fiber membrane, 4-microorganism acclimation tank, 4.1-microorganism Injection port, 5-valve, 6-grid, 7-sand settling tank, 8-primary settling tank, 9-composite membrane bioreactor, 10-disinfection tank.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and implement it, but the examples are not intended to limit the present utility model.

As shown in Figure 1, the composite membrane bioreactor of the present utility model includes an air supply unit, an aeration unit and a microorganism acclimation unit.

Wherein, the gas supply unit includes a fan 1 and a gas supply pipeline 2, which are used for gas supply of the composite membrane bioreactor. The aeration unit includes several aeration devices 3 (shown as 1). The microbial acclimation unit includes a microbial acclimation tank 4 and an aeration device 3 disposed in the microbial acclimation tank 4. The bottom of the microbial acclimation tank 4 is provided with a microorganism injection port 4.1 for feeding domesticated microorganisms.

The aeration device 3 includes a support 3.1 and several membrane modules 3.2. The bracket 3.1 is a hollow structure, one end of the bracket 3.1 is provided with a valve 5 and communicates with the gas supply pipeline 2, one end of the bracket 3.1 is rectangular, and the membrane modules 3.2 are evenly arranged in the rectangle. The membrane module 3.2 includes a communication module 3.21 sleeved on the support 3.1 and a plurality of hollow fiber membranes 3.22 arranged between the communication modules 3.21. Both ends of the hollow fiber membranes 3.22 communicate with the interior of the bracket 3.1.

It is conceivable that the stent 3.1 can also be U-shaped, S-shaped, etc., and can be made of metals such as alloys or materials with higher strength; the hollow fiber membrane 3.22 can also be attached to the stent by winding.

As shown in Figure 3: The hollow fiber membrane 3.22 includes a hollow braided tube and a separation membrane arranged outside the hollow braided tube. It can be made of pvdf (polyvinylidene fluoride) as a raw material, polyester braided tube as a reinforcement, and a spinneret is used. The coating device is prepared by coating the casting liquid (commercially available) evenly and flatly on the surface of the pretreated braided tube.

In the present utility model, when the composite membrane bioreactor is in use, one or more can be put in according to the specific conditions of the water source to be purified. When multiple, multiple reactors can be connected together by ropes.

As shown in Figure 6, in the MBR process using the utility model device, the water source enters the sedimentation tank 7 through the grid 6 to filter the precipitated impurities in the water, and then passes through the primary sedimentation tank 8 for the second precipitation and filtration, and then passes through the composite membrane biological reaction. The device 9 filters small molecular substances (the filtering effect is shown in Figures 4 and 5), and finally enters the disinfection tank 10 for disinfection to obtain high-quality water.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, other different forms of changes or modifications can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (10)

1. a composite membrane bioreactor, is characterized in that, comprises air supply unit, aeration unit and microorganism acclimation unit; The air supply unit includes a fan (1) and an air supply pipeline (2); the aeration unit includes a plurality of aeration devices (3); the microorganism acclimation unit includes a microorganism acclimation pool (4) and a an aeration device (3) in the acclimation tank (4), wherein a microorganism injection port (4.1) is opened at the bottom of the microorganism acclimation tank (4); The aeration device (3) comprises a support (3.1) and several membrane modules (3.2); the support (3.1) is a hollow structure, and one end of the support (3.1) is connected to the air supply pipe (2); the membrane The module (3.2) comprises a communication module (3.21) sleeved on the support (3.1) and a plurality of hollow fiber membranes (3.22) arranged between the communication modules (3.21), the hollow fiber membranes (3.22) Both ends of the bracket communicate with the inside of the bracket (3.1). 2 . The composite membrane bioreactor according to claim 1 , characterized in that, at least two fans ( 1 ) are arranged in parallel. 3 . 3. The composite membrane bioreactor according to claim 1, wherein a plurality of aeration devices (3) in the aeration unit are arranged in parallel. 4. The composite membrane bioreactor according to claim 1 or 3, characterized in that, the aeration unit comprises 20-50 aeration devices (3). 5. The composite membrane bioreactor according to claim 1, characterized in that, the aeration device (3) comprises 2-10 membrane modules (3.2). 6. The composite membrane bioreactor according to claim 1, wherein the membrane module (3.2) comprises 200-600 hollow fiber membranes (3.22). 7. The composite membrane bioreactor according to claim 1, characterized in that, the membrane area of the hollow fiber membrane (3.22) of a single aeration device (3) in the aeration unit is not less than ^25m2 . 8. The composite membrane bioreactor according to claim 1, characterized in that, one end of the support (3.1) away from the gas supply pipe (2) is annular, and the membrane assembly (3.2) is arranged on the between one end of the bracket (3.1) in the form of a ring. 9 . The composite membrane bioreactor according to claim 1 , wherein a valve ( 5 ) is provided at one end of the support ( 3.1 ) connected to the gas supply pipeline ( 2 ). 10 . 10. The composite membrane bioreactor according to claim 1, wherein the hollow fiber membrane (3.22) comprises a hollow braided tube and a separation membrane disposed outside the hollow braided tube.

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