CN210993795U - An ultrafiltration membrane self-cleaning device - Google Patents

Abstract

The utility model discloses an ultrafiltration membrane self-cleaning device, which comprises a water inlet system, an ultrafiltration membrane system, a backwashing system and a hydraulic automatic control system; the ultrafiltration membrane system includes an ultrafiltration membrane assembly, a water production pipe, and a backwashing system. The drain pipe, the water inlet of the ultrafiltration membrane module is connected to the water inlet system; the backwashing system includes a backwashing water tank and a siphon destruction bucket arranged in the backwashing water tank. The upper part of the backwashing water tank is provided with an overflow port, and the siphon destruction bucket and A siphon pipe is arranged between the backwash water tanks, and the other end of the water production pipe is connected to the backwash water tank; the hydraulic automatic control system includes a siphon outer casing, a siphon inner casing, a siphon auxiliary pipe, and a siphon destruction pipe. The ultrafiltration membrane self-cleaning device provided by the utility model can effectively clean the membrane filaments, reduce the use of valves and pumps, reduce energy consumption, and reduce operating costs.

Description

An ultrafiltration membrane self-cleaning device

technical field

The utility model belongs to the technical field of sewage treatment, in particular to an ultrafiltration membrane self-cleaning device.

Background technique

Ultrafiltration is a membrane separation technology that purifies and separates solutions. Driven by pressure difference, the ultrafiltration membrane only allows water, inorganic salts and small molecular organics in the solution to pass through, while the suspended solids and colloids in the solution are passed through. , macromolecular substances such as proteins and microorganisms are trapped on the outer surface, so as to achieve the purpose of purification and separation. With the extension of operating time, the problem of membrane fouling will inevitably occur. Therefore, certain methods must be taken to remove the pollutants on the membrane surface or in the membrane pores, so as to restore the water production and prolong the life of the membrane. The cleaning methods for membrane fouling include physical cleaning and chemical cleaning. The most commonly used physical cleaning method is the hydraulic flushing method, and the chemical cleaning method refers to the method of adding a drug-assisted cleaning method, including the addition of fungicides. Usually, the system will set a reasonable cleaning method, and use the physical method to rinse, and only use the chemical cleaning method when the physical method cannot achieve the desired effect.

The most commonly used physical cleaning method is the hydraulic flushing method, including backflushing and forward flushing, and the cleaning medium is water and gas. Hydraulic flushing is generally a short-term backwashing of the membrane with ultra-filtered water. Practice has proved that the backwash method can punch out the micropores blocked by particles on the surface of the membrane, and can effectively destroy the structure of the gel layer, which is more effective in restoring the water permeability of the membrane than the isobaric flushing method.

Usually in the ultrafiltration backwashing, the backwashing valve and the backwashing pump are used to transport the backwashing water into the ultrafiltration membrane module for backwashing the membrane, and the backwashing pump needs to be connected to the PLC to realize automatic control, which increases a certain amount. In addition, the energy consumption during the operation of the backwash pump is high, which increases the operating cost of the system; if the pump fails or is damaged during the operation, it will not only affect the normal operation of the system, but also need to be repaired or repurchased. cause additional economic losses.

Utility model content

The purpose of the utility model is to provide an ultrafiltration membrane self-cleaning device, which can effectively clean the membrane filaments and reduce the operation cost.

Based on the above problems, the technical solution provided by the present utility model is:

An ultrafiltration membrane self-cleaning device, comprising a water inlet system, an ultrafiltration membrane system, a backwashing system, and a hydraulic automatic control system;

The ultrafiltration membrane system includes an ultrafiltration membrane module, a water production pipe connected to the water production outlet of the ultrafiltration membrane module at one end, and a backwash drain pipe connected to the concentrated water outlet of the ultrafiltration membrane module at one end. the water inlet of the filter membrane assembly is connected to the water inlet system;

The backwashing system includes a backwashing water tank and a siphon destruction bucket arranged in the backwashing water tank. An overflow port is provided on the upper part of the backwashing water tank, and a siphon destruction bucket is arranged between the backwashing water tank and the backwashing water tank. There is a siphon pipe, and the other end of the water production pipe is connected to the backwash water tank;

The hydraulic automatic control system includes a siphon outer casing, a siphon inner casing, a siphon auxiliary pipe, a siphon destruction pipe, and a drainage water seal well. Both ends of the siphon outer casing are sealed, and the upper end of the siphon inner casing extends to the The siphon outer casing is in and spaced from the top of the siphon outer casing, the lower end of the siphon inner casing extends to the drainage water seal well, and the siphon inner casing and the siphon outer casing are spaced An annular space is formed, the other end of the backwashing drainage pipe is connected to the annular space, the siphon auxiliary pipe is arranged in the inner casing of the siphon, and the siphon auxiliary pipe includes a water seal connecting the annular space and the drainage. A drain pipe section of a well, and a vent pipe section connected to the drain pipe section and extending above the siphon inner casing, the siphon break tube extending at one end above the siphon inner casing and at the other end to the siphon Destroy the bucket.

In some embodiments, the upper and lower end plates of the backwash tank are respectively provided with upper and lower limit holes, and the siphon outer sleeve is fixed in the upper and lower limit holes, and The outer wall is sealingly matched with the backwash water tank, the upper end of the siphon outer sleeve extends above the backwash water tank, and the lower end of the siphon outer sleeve is arranged between the backwash water tank and the ultrafiltration membrane assembly .

In some embodiments, the siphon pipe is U-shaped, one end of the siphon pipe extends into the siphon destruction bucket and the other end extends into the backwash water tank, and one end located in the backwash water tank is located in the backwash tank. Below one end of the siphon breaking bucket.

In some of these embodiments, the end of the siphon breaking tube extending into the siphon breaking hopper is above the end of the siphon breaking tube located in the siphon breaking hopper.

In some embodiments, the main body of the siphon breaking tube is fixed on the inner wall of the siphon outer sleeve, the upper end of the siphon breaking tube is bent and then extends above the siphon inner sleeve, the siphon breaking tube The lower part passes through the outer wall of the siphon outer casing and extends into the siphon breaking small bucket, and the siphon breaking pipe is sealedly connected with the pipe wall of the siphon outer casing.

In some of these embodiments, the upper end of the drainage pipe section is fixed on the inner siphon casing pipe wall and communicates with the annular space, and the lower part of the drainage pipe section is fixed on the siphon inner casing pipe wall.

In some of these embodiments, the upper port of the drain pipe section is located 0.1-0.15 m below the top of the siphon inner sleeve.

In some of these embodiments, the exhaust pipe section extends upwardly from the upper outer wall of the drain pipe section to below the top of the siphon outer sleeve.

In some of these embodiments, the top of the siphon inner sleeve is located 0.05-0.10 m below the top of the siphon outer sleeve.

In some of these embodiments, the drainage water sealing well is located 1.0m-1.2m below the surface.

Compared with the prior art, the advantages of the present utility model are:

1. By adopting the technical scheme of the present utility model, under the action of siphoning, the membrane module is backwashed by using the produced water in the water production tank, which can effectively clean the membrane filaments, restore the membrane filaments to the flux of normal operation, and reduce the backwash. The use of valves and pumps in the washing process is convenient for installation and low investment cost, which can reduce operating costs and avoid a lot of energy consumption in the backwashing process;

2. The technical scheme of the present utility model is adopted to maintain the normal operation of the system, avoid failure or damage of the backwash pump, valve, etc. during the operation process and affect the normal operation of the system, and also reduce the maintenance cost of the system.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. The drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of a kind of ultrafiltration membrane self-cleaning device embodiment of the present utility model;

in:

1. Water inlet pipe; 2. Inlet water pump; 3. Ultrafiltration membrane module; 4. Water production pipe; 5. Backwash drainage pipe; 6. Backwash water tank; , siphon pipe; 9, siphon damage pipe; 10, siphon outer casing; 11, siphon inner casing; 12, siphon auxiliary pipe; 12-1, drainage pipe section; 12-2, exhaust pipe section; 13, drainage water sealing well .

Detailed ways

The above scheme will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended to illustrate the present invention and not to limit the scope of the present invention. The implementation conditions used in the examples can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in routine experiments.

Referring to FIG. 1 , which is a schematic structural diagram of the present invention, an ultrafiltration membrane self-cleaning device is provided, including a water inlet system, an ultrafiltration membrane system, a backwashing system, and a hydraulic automatic control system.

The ultrafiltration membrane system includes an ultrafiltration membrane module 3, a water production pipe 4 connected to the water production outlet of the ultrafiltration membrane module 3 at one end, and a backwash drain pipe 5 connected to the concentrated water outlet of the ultrafiltration membrane module 3 at one end. The water inlet of 3 is connected to the water inlet system, the ultrafiltration membrane is an external pressure membrane, and the water inlet system includes a water inlet pipe 1 and an inlet pump 2 arranged on the water inlet pipe 1 .

The backwashing system includes a backwashing water tank 6 and a siphon destruction bucket 7 arranged in the backwashing water tank 6. The backwashing water tank 6 is arranged above the ultrafiltration membrane module 3 and can be supported by a steel structure. The upper part of the backwashing water tank 6 is provided with Overflow port 6-1, the overflow port 6-1 is connected to the clean water tank through the overflow pipe, a siphon pipe 8 is provided between the siphon destruction bucket 7 and the backwash water tank 6, and the other end of the water production pipe 4 is connected to the backwash water tank 6 bottom. The siphon 8 is U-shaped, one end of the siphon 8 extends into the siphon destruction bucket 7 and the other end extends into the backwash tank 6 , and the end located in the backwash tank 6 is below the end located in the siphon destruction bucket 7 .

The hydraulic automatic control system includes a siphon outer casing 10, a siphon inner casing 11, a siphon auxiliary pipe 12, a siphon destruction pipe 9, and a drainage water sealing well 13. The siphon outer casing 10 is sealed at both ends, and the siphon inner casing 11 The upper end extends to The siphon outer sleeve 12 has a space between it and the top of the siphon outer sleeve 12. Preferably, the top of the siphon inner sleeve 11 is located 0.05-0.10m below the top of the siphon outer sleeve 10, and the lower end of the siphon inner sleeve 11 passes through. The lower end of the siphon outer casing 10 extends to the drainage water seal well 13, an annular space is formed between the siphon inner casing 11 and the siphon outer casing 10, the other end of the backwash drainage pipe 5 is connected to the annular space, and the siphon auxiliary pipe 12 is arranged in the annular space. Inside the siphon inner casing 11 , the siphon auxiliary pipe 12 includes a drainage pipe section 12 - 1 that communicates with the annular space and the drainage water seal well 13 , and an exhaust pipe section 12 that communicates with the drainage pipe section 12 - 1 and extends above the siphon inner casing 11 . -2, one end of the siphon breaking tube 9 extends above the siphon inner sleeve 11 and the other end extends into the siphon breaking bucket 7 .

In this example, the upper end plate and the lower end plate of the backwash tank 6 are respectively provided with an upper limit hole and a lower limit hole. 6. Sealing fit, the upper end of the siphon outer sleeve 10 extends to the top of the backwash tank 6, and the lower end of the siphon outer sleeve 10 is arranged between the backwash tank 6 and the ultrafiltration membrane assembly 3.

In this example, the end of the siphon breaking tube 9 that extends into the siphon breaking hopper 7 is located above the end of the siphon breaking hopper 7, so that when the liquid level in the siphon breaking hopper 7 drops below the lower end of the siphon breaking tube 9, The siphon breaking tube 9 takes in air, thereby breaking the vacuum environment within the siphon outer casing 10 .

The main body of the siphon destruction tube 9 is fixed on the inner wall of the siphon outer sleeve 10. In practice, the plastic material can be fixed by hot melt bonding, and the cast iron and stainless steel materials can be fixed by welding. The upper end of the siphon destruction tube 9 is bent and extended. Above the siphon inner sleeve 11 , the lower part of the siphon breaking tube 9 passes through the outer wall of the siphon outer sleeve 10 and extends into the siphon breaking bucket 7 .

In this example, the upper end of the drainage pipe section 12-1 is fixed on the pipe wall of the siphon inner casing 11 and communicated with the annular space, and the lower part of the drainage pipe section 12-1 is fixed on the pipe wall of the siphon inner casing 11. In practice, the plastic material can be It is fixed by hot melt bonding, and cast iron and stainless steel materials can be fixed by welding. The upper port of the drain pipe section 12-1 is located at a position of 0.1-0.15m below the top of the inner casing 11 of the siphon. The exhaust pipe section 12-2 extends upwardly from the upper outer wall of the drain pipe section 12-1 to below the top of the siphon outer sleeve 10.

The drainage water seal well 13 is located 1.0m to 1.2m below the surface. The soil layer above the drainage water seal well 13 can play a fixed role in the lower part of the siphon inner casing 11. In addition, the drainage water seal well 13 can be set underground. Prevent freezing in winter.

The working process of the utility model is as follows: the raw water first enters the water inlet pipe 1 through the inlet pump 2, and then enters the ultrafiltration membrane module 3 through the lower water inlet of the ultrafiltration membrane module 3. The ultrafiltration membrane module 3 here is: External pressure film; under the action of the external pressure film, the product water formed by the raw water enters the backwash water tank 6 through the water production pipe 4, and the concentrated water enters the siphon outer casing 10 and the siphon inner casing 11 through the backwash drainage pipe 5 in the annular space between. As the membrane filtration proceeds, the concentrated water level in the annular space continues to rise. When the water level rises to the upper nozzle of the drainage pipe section 12-1, the concentrated water enters the drainage pipe section 12-1 through the nozzle, and then flows down into the drainage water seal. In the well 13, depending on the vacuum formed in the pipe by the descending water flow and the air-entrainment effect of the water flow, the exhaust pipe section 12-2 continuously draws out the air in the siphon casing, so that the vacuum degree in the siphon casing gradually increases. As the water level in the annular space continues to rise, the lower part of the drainage pipe section 12-1 sucks the water in the drainage water seal well 13 to a certain height. The degree of vacuum increases sharply, and when it reaches a certain level, the falling water flow and the rising water flow in the drainage pipe section 12-1 merge into a stream to take away all the residual air in the pipe, forming a continuous siphon, plus the gravity of the backwash tank 6, Eventually, the water in the backwash water tank 6 enters the external pressure membrane in the opposite direction of the membrane filtration, and the backwashing starts. During the backwashing process, the water inflow does not stop, and the membrane surface is cleaned as a positive washing method under the action of siphon. The backwashing water in the backwashing water tank 6 backwashes the membrane from the inside of the membrane, and then communicates with the outside of the membrane. The influent water is discharged into the annular space in the hydraulic automatic control system together. As the backwashing continues, the water level in the backwashing water tank 6 becomes lower and lower. When the water level in the backwashing water tank 6 drops to the siphon destruction bucket 7, The siphon destruction pipe 9 enters the air, and the siphon is destroyed, so that the backwashing is terminated, and the membrane filtration process of the next cycle is entered.

The above examples are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to allow those who are familiar with the technology to understand the content of the present invention and implement accordingly, and cannot limit the scope of protection of the present invention with this. All equivalent transformations or modifications made according to the spirit of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An ultrafiltration membrane self-cleaning device is characterized in that: comprises a water inlet system, an ultrafiltration membrane system, a backwashing system and a hydraulic automatic control system;

the ultrafiltration membrane system comprises an ultrafiltration membrane component (3), a water production pipe (4) with one end connected to a water production port of the ultrafiltration membrane component (3), and a backwashing drain pipe (5) with one end connected to a concentrated water discharge port of the ultrafiltration membrane component (3), wherein a water inlet of the ultrafiltration membrane component (3) is connected to the water inlet system;

the backwashing system comprises a backwashing water tank (6) and a siphon damage hopper (7) arranged in the backwashing water tank (6), an overflow port (6-1) is formed in the upper part of the backwashing water tank (6), a siphon (8) is arranged between the siphon damage hopper (7) and the backwashing water tank (6), and the other end of the water production pipe (4) is connected to the backwashing water tank (6);

the hydraulic automatic control system comprises a siphon external sleeve (10), a siphon internal sleeve (11), a siphon auxiliary pipe (12), a siphon breaking pipe (9) and a drainage water sealing well (13), wherein two ends of the siphon external sleeve (10) are sealed, the upper end of the siphon internal sleeve (11) extends into the siphon external sleeve (10) and is spaced from the top of the siphon external sleeve (10), the lower end of the siphon internal sleeve (11) extends into the drainage water sealing well (13), an annular space is formed between the siphon internal sleeve (11) and the siphon external sleeve (10), the other end of a backwashing drainage pipe (5) is connected to the annular space, the siphon auxiliary pipe (12) is arranged in the siphon internal sleeve (11), and the siphon auxiliary pipe (12) comprises a drainage pipe section (12-1) which communicates the annular space with the drainage water sealing well (13), And an exhaust pipe section (12-2) communicated to the drain pipe section (12-1) and extending to the upper part of the siphon inner sleeve (11), wherein one end of the siphon break pipe (9) extends to the upper part of the siphon inner sleeve (11) and the other end extends into the siphon break hopper (7).

2. The ultrafiltration membrane self-cleaning apparatus of claim 1, wherein: be equipped with spacing hole, spacing hole down on the upper end plate of backwash water tank (6), the lower end plate respectively, siphon outside sleeve pipe (10) are fixed spacing hole, spacing downthehole down go up, and the outer wall with backwash water tank (6) are sealed to be cooperated, siphon outside sleeve pipe (10) upper end extends to the top of backwash water tank (6), siphon outside sleeve pipe (10) lower extreme sets up backwash water tank (6) with between milipore filter subassembly (3).

3. The ultrafiltration membrane self-cleaning apparatus of claim 1, wherein: siphon (8) are the U type, siphon (8) one end extend to in siphon destroys fill (7) and the other end extend to in backwash water tank (6), and be located one end in backwash water tank (6) is located siphon destroys the below of fighting (7) interior one end.

4. The ultrafiltration membrane self-cleaning apparatus of claim 3, wherein: the siphon breaking pipe (9) extends into one end of the siphon breaking hopper (7) and is positioned above one end of the siphon (8) in the siphon breaking hopper (7).

5. The ultrafiltration membrane self-cleaning apparatus of claim 1, wherein: siphon destroys pipe (9) main part and fixes on siphon outside sleeve pipe (10) inner wall, siphon destroys and extends after pipe (9) upper end is buckled inside sleeve pipe (11) top of siphon, siphon destroys pipe (9) lower part and passes extend behind siphon outside sleeve pipe (10) outer wall in the siphon destroys fill (7), siphon destroys pipe (9) with siphon outside sleeve pipe (10) pipe wall sealing connection.

6. The ultrafiltration membrane self-cleaning apparatus of claim 1, wherein: the upper end of the drainage pipe section (12-1) is fixed on the pipe wall of the siphon inner sleeve (11) and communicated to the annular space, and the lower part of the drainage pipe section (12-1) is fixed on the pipe wall of the siphon inner sleeve (11).

7. The ultrafiltration membrane self-cleaning apparatus of claim 6, wherein: the upper port of the drainage pipe section (12-1) is located at a position of 0.1-0.15 m below the top of the siphon inner sleeve (11).

8. The ultrafiltration membrane self-cleaning apparatus of claim 1, wherein: the exhaust pipe section (12-2) extends upwards from the outer wall of the upper part of the drainage pipe section (12-1) to the position below the top of the siphon outer sleeve (10).

9. The ultrafiltration membrane self-cleaning apparatus of claim 1, wherein: the top of the siphon inner sleeve (11) is located at a position of 0.05-0.10 m below the top of the siphon outer sleeve (10).

10. The ultrafiltration membrane self-cleaning apparatus of claim 1, wherein: the drainage water seal well (13) is positioned at a position 1.0-1.2 m below the ground surface.

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