CN204039126U - A kind of membrane bioreactor - Google Patents

Abstract

The utility model discloses a kind of membrane bioreactor, comprise the membrane module and gas and water separator that can be placed in muddy water mixed solution, the product water inner chamber that membrane module comprises filter membrane and formed by described filter membrane, produce water inner chamber to be communicated with described gas and water separator by water producing pipe, described gas and water separator comprises piston barrel and to be located in described piston barrel and described piston barrel inner chamber to be divided into the piston of ante-chamber and back cavity, described piston be provided with can conducting ante-chamber to the check valve of rear cavity direction, described water producing pipe is communicated with the ante-chamber of piston barrel, be communicated with the back cavity of described piston barrel and be provided with outer the practice midwifery outlet conduit of water pump and the steam line of external gas source.The utility model, by arranging gas and water separator, adopts source of the gas as the propulsion source of backwash, has saved the main equipment of the costlinesses such as backwash pump, thus reduces engineering cost and ton water rate use.The increase ratio backwash water pump that facts have proved pressure is more quick, can more effectively cleaning film surface, and treatment effect is good, and unit consumption of energy is low.

Description

A membrane bioreactor

technical field

The utility model is used in the technical field of water purification treatment, in particular to a membrane bioreactor.

Background technique

Membrane bioreactor (Membrane Bioreactor-MBR) is an emerging water treatment technology, which is an organic combination of traditional sewage biological treatment process and membrane separation technology, and has been widely used in sewage treatment. The principle of membrane bioreactor is to use membrane separation technology to replace the secondary sedimentation tank in the traditional activated sludge method. Membrane bioreactors are generally composed of two parts: a membrane module and a bioreactor. According to the position of the membrane module, it can be divided into two types: separate type and integrated type. Among them, the integrated type is to install the membrane module and the bioreactor separately. The mixed solution of the bioreactor enters the membrane module after being pressurized by the pump. Under the action of the pressure, the liquid in the mixed solution permeates the membrane and becomes the treated effluent of the system. Activated sludge and particulate matter are trapped in the bioreactor by the membrane module, thereby retaining a higher concentration of activated sludge. Due to the many advantages of the membrane bioreactor, it has been widely used at home and abroad.

However, since the membrane surface of the integrated membrane bioreactor is in direct contact with the high-concentration activated sludge in the reactor, it is very easy to produce concentration polarization, resulting in pollution of the membrane surface; Backwashing is a process in which the product water is used as flushing water and flows out from the filter membrane on the product water side to the water inlet side under pressure. However, the entire water backwashing process consumes a lot of energy, resulting in a high cost per ton of water treatment for membrane bioreactors, which restricts the development of membrane bioreactor technology. It is imminent to adopt a backwash method that can overcome the defect of high energy consumption of traditional membrane bioreactor technology.

Utility model content

In order to solve the above problems, the utility model provides a membrane bioreactor with good treatment effect and low unit energy consumption.

The technical solution adopted by the utility model to solve the technical problem is: a membrane bioreactor, including a membrane module and a gas-water separation device that can be placed in the mud-water mixture, the membrane module includes a filter membrane and a The water-producing inner chamber is formed, and the water-producing inner chamber is communicated with the gas-water separation device through the water-producing pipe, and the gas-water separation device includes a piston cylinder and is arranged in the piston cylinder and the inner chamber of the piston cylinder The piston is divided into a front chamber and a rear chamber. The piston is provided with a one-way valve that can lead the direction from the front chamber to the rear chamber. The water production pipe communicates with the front chamber of the piston cylinder and communicates with the rear chamber of the piston cylinder It is connected with the outlet pipeline of the external produced water pump and the gas supply pipeline of the external gas source.

As a further improvement of the technical solution of the present utility model, there is at least one membrane module, and when there are multiple membrane modules, each membrane module is arranged in parallel, and the water production pipe includes a water production tube communicating with the water production cavity of each membrane module. branch pipes and the main water production pipes connecting each of the produced water branch pipes into the gas-water separation device.

As a further improvement of the technical solution of the present utility model, a first shut-off valve and a second shut-off valve are provided along the water outlet pipeline, and the air supply pipeline flows into the water outlet between the first shut-off valve and the second shut-off valve. pipeline, and a third shut-off valve is arranged on the gas supply pipeline.

As a further improvement of the technical solution of the utility model, an aeration pipeline is further included, and the aeration pipeline forms a plurality of aeration ports under the membrane module.

As a further improvement of the technical solution of the utility model, the aeration pipeline is connected with the air source and connected in parallel with the air supply pipeline, and a fourth cut-off valve is provided on the aeration pipeline.

As a further improvement of the technical solution of the utility model, the air source is an air compressor.

As a further improvement of the technical solution of the utility model, the water outlet of the water production pump is externally connected to a water collection device or an advanced treatment device.

As a further improvement of the technical solution of the utility model, the one-way valve is one or more one-way doors arranged on the piston that can be opened to the rear cavity.

As a further improvement of the technical solution of the utility model, the filter membrane is an ultrafiltration membrane.

The beneficial effects of the utility model:

The working principle of this membrane bioreactor is as follows: the produced water enters the produced water inner chamber through the filter membrane from the outside of each membrane module, and collects in the produced water main pipe through the produced water branch pipe; the piston in the gas-water separation device is set to the top, and the one-way valve is open state, the produced water flows into the outlet pipe, enters the produced water pump by controlling the first stop valve and the second stop valve; at the same time, the air blown by the air compressor enters the aeration pipeline through the fourth stop valve, and passes through The air port enters the membrane separation area to flush and clean the membrane components. When the filter membrane of the membrane module needs to be cleaned, turn off the produced water pump, put the second shut-off valve in the closed state, close the fourth shut-off valve at the same time, open the third shut-off valve, and the air from the air compressor enters the gas-water separation through the outlet pipe. device, the one-way valve in the gas-water separation device is closed, the piston moves down under the pressure, and the produced water is forced to flow out of the membrane module along the radial direction and reverse direction of the filter membrane, and at the same time, the fouling is discharged to play a role of backwash cleaning .

Compared with the prior art, the present invention has the following beneficial effects:

(1) The utility model adopts a perfect pipeline design and uses an aeration gas source to replace the backwash water pump, which saves expensive large-scale equipment such as backwash water pumps, thereby reducing engineering costs and ton water costs.

(2) The utility model adopts the gas source as the power source of the backwash by setting the gas-water separation device. Practice has proved that the pressure rise is faster than the backwash water pump, and the membrane surface can be cleaned more effectively. The treatment effect is good, and the unit energy consumption Low.

(3) Generally, when the pressure of the gas source is greater than the bubble point of the produced water, it will cause the water-produced mixture to boil, resulting in the failure of backwashing. This utility model innovatively adopts the design of the gas-water separation device, and utilizes the direct effect of the backlog of the gas source pressure The product water in the product water pipe can achieve efficient backwashing without additional control of the pressure of the air source.

(4) Compared with the backwash pump, the operation is faster. All components are automatically controlled and connected to the main control box, which can realize frequent and fast backwashing in a short period at a lower level of energy consumption.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a structural schematic diagram of an embodiment of the utility model.

Detailed ways

With reference to Fig. 1, the utility model provides a kind of membrane bioreactor, comprises the membrane module 1 that can be placed in the mud-water mixture and gas-water separation device 2, and described membrane module 1 comprises ultrafiltration membrane and is formed by described filtration membrane The inner cavity of the water production, the inner cavity of the water production is communicated with the gas-water separation device 2 through the water production pipe, the gas-water separation device 2 includes a piston cylinder 21 and is located in the piston cylinder 21 and the piston The inner chamber of cylinder 21 is divided into front cavity 22 and piston 24 of rear cavity 23. Said piston 24 is provided with a one-way valve 25 which can conduct the direction of front cavity 22 to rear cavity 23. The water production pipe and piston cylinder 21 The front chamber 22 communicates with the rear chamber 23 of the piston barrel 21 and is provided with a water outlet pipe 3 connected to an external water production pump and an air supply pipe 4 connected to an external air compressor. The water outlet of the produced water pump is externally connected to a water collection device or an advanced treatment device.

Wherein, there is at least one membrane module 1, and when there are multiple membrane modules 1, each membrane module 1 is arranged in parallel, and the water production pipe includes a water production branch pipe 11 communicated with the water production inner chamber of each membrane module 1 and a Each of the produced water branch pipes 11 merges into the produced water main pipe 12 of the gas-water separation device 2 .

The one-way valve 25 is one or more one-way doors arranged on the piston 24 that can be opened to the rear cavity 23 .

A first shut-off valve 51 and a second shut-off valve 52 are provided along the outlet pipeline 3, and the air supply pipeline 4 flows into the outlet pipeline 3 between the first shut-off valve 51 and the second shut-off valve 52, so that The air supply pipeline 4 is provided with a third stop valve 53 .

It also includes an aeration pipeline 6 which forms a number of aeration ports 61 under the membrane module 1 . The aeration pipeline 6 communicates with the air source and is connected in parallel with the air supply pipeline 4 , and the aeration pipeline 6 is provided with a fourth cut-off valve 54 .

The first shut-off valve 51 , the second shut-off valve 52 , the third shut-off valve 53 , the fourth shut-off valve 54 , the produced water pump and the air compressor are all in communication with the main control box.

The working principle of this membrane bioreactor is: the water produced enters the inner chamber of the water produced through the filter membrane from the outside of each membrane module 1, and is collected in the water produced main pipe 12 through the water produced branch pipe 11; the piston 24 in the gas-water separation device 2 is placed on the top, and The one-way valve 25 is in the open state, and the produced water flows into the outlet pipe 3, and enters the produced water pump through the control of the first stop valve 51 and the second stop valve 52; at the same time, the air blown by the air compressor passes through the fourth stop valve 54 , enter the aeration pipeline 6, and enter the membrane separation area through the aeration port 61 to flush and clean the membrane module 1. When the filter membrane of the membrane module 1 needs to be cleaned, the produced water pump is turned off, the second shut-off valve 52 is placed in a closed state, the fourth shut-off valve 54 is closed at the same time, and the third shut-off valve 53 is opened, so that the gas of the air compressor passes through the water outlet pipe 3 Enter the gas-water separation device 2, the one-way valve 25 in the gas-water separation device 2 is closed, the piston 24 moves down under the pressure, and the produced water is forced to flow out of the membrane module 1 in the radial direction and reverse direction of the filter membrane, and at the same time Contamination and blockage, play the role of backwash cleaning.

When the above-mentioned membrane bioreactor cleaning method is applied to a certain domestic sewage treatment, the aeration cycle is set to 540 seconds, and the dissolved oxygen concentration is 0.2-2 mg/L. The influent water quality of domestic sewage is: COD=300mg/L, BOD ₅ =120mg/L, TN=35mg/L, NH ₃ -N= 30mg/L. The water quality after treatment is: COD=38mg/L, BOD ₅ =18mg/L, TN=8mg/L, NH ₃ -N= 4mg/L, and the corresponding removal rates are 87.3%, 85.0%, 77.1% and 86.7%, the water quality of this product meets the national "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) Class A Standard.

Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent modifications or replacements without violating the spirit of the present utility model. These equivalent modifications or replacements are all included in the claims of this application. within the limited range.

Claims (9)

1. A membrane bioreactor, characterized in that: comprise a membrane module and a gas-water separation device that can be placed in the mud-water mixture, the membrane module includes a filter membrane and a water-producing inner chamber formed by the filter membrane, so The inner cavity of the water production is communicated with the gas-water separation device through the water production pipe, and the gas-water separation device includes a piston cylinder and a valve that is arranged in the piston cylinder and divides the inner cavity of the piston cylinder into a front chamber and a rear chamber. Piston, the piston is provided with a one-way valve that can lead the direction from the front chamber to the rear chamber, the water production pipe communicates with the front chamber of the piston cylinder, and communicates with the rear chamber of the piston cylinder, and is provided with a water outlet of an external water production pump Pipelines and air supply pipes for external air sources. 2. The membrane bioreactor according to claim 1, characterized in that: there is at least one membrane module, and when there are multiple membrane modules, each membrane module is arranged in parallel, and the water production pipe includes a connection with each membrane module The produced water branch pipes connected to the produced water inner cavity and the produced water main pipe connecting each of the produced water branch pipes into the gas-water separation device. 3. The membrane bioreactor according to claim 1 or 2, characterized in that: a first shut-off valve and a second shut-off valve are arranged along the outlet pipeline, and the gas supply pipeline is connected to the first shut-off valve and the second shut-off valve. The second shut-off valve is connected to the water outlet pipeline, and the air supply pipeline is provided with a third shut-off valve. 4. The membrane bioreactor according to claim 3, characterized in that it further comprises an aeration pipeline, and the aeration pipeline forms a plurality of aeration ports under the membrane module. 5. The membrane bioreactor according to claim 4, characterized in that: the aeration pipeline communicates with the gas source and is connected in parallel with the gas supply pipeline, and a fourth cut-off is provided on the aeration pipeline. valve. 6. The membrane bioreactor according to claim 5, characterized in that: the gas source is an air compressor. 7. The membrane bioreactor according to claim 1, characterized in that: the water outlet of the water production pump is externally connected to a water collection device or an advanced treatment device. 8. The membrane bioreactor according to claim 1, characterized in that: the one-way valve is one or more one-way doors arranged on the piston that can be opened to the rear chamber. 9. The membrane bioreactor according to claim 1, characterized in that: the filter membrane is an ultrafiltration membrane.