CN115532069A - A submerged ultrafiltration membrane off-line cleaning device - Google Patents

Abstract

The invention discloses a submerged ultrafiltration membrane off-line cleaning device, which comprises a cleaning water tank, a cleaning liquid supply system, a membrane wire hanger and a positive washing water distribution pipeline. The feed valve is connected to the cleaning liquid supply system, the membrane wire hanger is installed under the water distribution pipeline for washing, the water distribution pipe inside the membrane wire hanger is connected to the cleaning liquid supply system through the backwash feed valve, and the cleaning water tank It is equipped with a cleaning liquid heating system and an aeration system, and the bottom of the cleaning water tank is connected to the cleaning liquid supply system through the outlet valve of the water tank. The invention uses a cleaning liquid heating system to heat the cleaning liquid, and increases the solubility of pollutants and reaction products by increasing the temperature of the cleaning liquid, which not only reduces water consumption, chemical consumption, and compressed air consumption, reduces cleaning costs, but also effectively improves Improve the cleaning effect and prolong the service life of the ultrafiltration membrane.

Description

A submerged ultrafiltration membrane off-line cleaning device

technical field

The invention relates to a submerged ultrafiltration membrane off-line cleaning device, which can reduce the cleaning cost, improve the cleaning effect and prolong the service life of the ultrafiltration membrane, and belongs to the technical field of water treatment.

Background technique

Some steel mills use submerged ultrafiltration membranes as pretreatment equipment for comprehensive wastewater advanced treatment. This submerged ultrafiltration membrane is an external pressure hollow fiber module without a casing. Water collection pipes are installed at both ends of the fiber, and the module is directly placed into the treated In water, vacuum filtration is achieved by means of suction through water. Multiple components are connected together, installed in a frame, and then put into the membrane pool, the size of which depends on the processing capacity of the device. When the ultrafiltration membrane is polluted, the performance is generally restored by online physical cleaning and chemical cleaning. Since the online cleaning method cannot accurately control the temperature of the cleaning solution, the consumption of water, chemicals and compressed air will increase, which will greatly increase the cleaning cost, and the cleaning effect will gradually deteriorate with the prolongation of the use time, which will seriously affect the ultrafiltration. membrane life. Therefore, it is very necessary to find a new way of cleaning the submerged ultrafiltration membrane.

Contents of the invention

The purpose of the present invention is to provide a submerged ultrafiltration membrane off-line cleaning device to reduce the cleaning cost, improve the cleaning effect and prolong the service life of the ultrafiltration membrane against the disadvantages of the prior art.

To achieve the above object, the present invention adopts the following technical solutions:

A submerged ultrafiltration membrane off-line cleaning device, including a cleaning water tank, a cleaning liquid supply system, a membrane wire hanger and a positive washing water distribution pipeline, the positive washing water distribution pipeline is installed on the lower part of the top plate of the cleaning water tank and passes through the positive cleaning feed valve and The cleaning liquid supply system is connected, the membrane wire hanger is installed under the water distribution pipe for washing, the water distribution pipe inside the membrane wire hanger is connected with the cleaning liquid supply system through the backwash feed valve, and the cleaning water tank is provided with a cleaning liquid Heating system and aeration system, the bottom of the cleaning water tank is connected with the cleaning liquid supply system through the outlet valve of the water tank.

In the above-mentioned submerged ultrafiltration membrane off-line cleaning device, the cleaning liquid heating system includes a steam valve and a steam pipe, the steam inlet end of the steam pipe is connected to the steam source through the steam valve, and the steam outlet end is located in the cleaning liquid below the inside of the cleaning water tank. middle.

In the above-mentioned submerged ultrafiltration membrane off-line cleaning device, the cleaning liquid heating system also includes a cleaning liquid temperature measuring device, and the cleaning liquid temperature measuring device includes a temperature probe and a temperature display screen, and the temperature probe is installed below the inside of the cleaning water tank, The temperature display screen is installed outside the cleaning water tank, and the input end of the temperature display screen is connected with the signal output end of the temperature probe through a cable.

In the above submerged ultrafiltration membrane off-line cleaning device, the aeration system includes an aeration valve and an aeration pipe, and the aeration pipe is horizontally installed in the cleaning liquid below the inside of the cleaning water tank, and the air jet on the aeration pipe faces upwards , the air inlet is connected to the high-pressure air source through the aeration valve.

In the above-mentioned submerged ultrafiltration membrane off-line cleaning device, the cleaning solution supply system includes a cleaning water pump, a cleaning medicine box A, and a cleaning medicine box B, and the liquid inlet of the cleaning water pump passes through the outlet valve of the medicine box A and the outlet valve of the medicine box B. , Water tank outlet valves are respectively connected with A cleaning medicine box, B cleaning medicine box, and the liquid outlet at the bottom of the cleaning water tank, and the liquid outlet of the cleaning water pump is connected with the forward washing feed valve and the backwash feed valve through the Unicom valve.

In the above-mentioned submerged ultrafiltration membrane off-line cleaning device, the cleaning solution supply system also includes a precision filter, a filter outlet valve and a filter inlet valve, and the liquid inlet of the precision filter passes through the connection between the filter inlet valve and the cleaning water pump. The liquid outlet is connected, and the liquid outlet is connected with the forward washing feed valve and the backwash feed valve through the filter outlet valve.

In the above-mentioned submerged ultrafiltration membrane off-line cleaning device, a water pump inlet valve is installed between the A medicine box outlet valve, the B medicine box outlet valve, the water tank outlet valve, and the liquid inlet of the cleaning water pump, and the liquid inlet valve of the water pump inlet There is a return valve between the end and the liquid outlet of the cleaning water pump.

In the above submerged ultrafiltration membrane off-line cleaning device, a pressure gauge is installed at the liquid outlet of the cleaning water pump.

In the above-mentioned submerged ultrafiltration membrane off-line cleaning device, the bottoms of the precision filter, A cleaning medicine box, and B cleaning medicine box are all equipped with vent valves.

In the above submerged ultrafiltration membrane off-line cleaning device, the high-pressure air source is compressed air.

The invention uses a cleaning liquid heating system to heat the cleaning liquid, and increases the solubility of pollutants and reaction products by increasing the temperature of the cleaning liquid, which can not only reduce water consumption, chemical consumption and compressed air consumption, reduce cleaning costs, but also effectively improve Improve the cleaning effect and prolong the service life of the ultrafiltration membrane.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of the present invention.

The labels in the figure are as follows: 1. Filter vent valve; 2. Precision filter; 3. Filter outlet valve; 4. Filter inlet valve; 5. Cleaning water pump; 6. Unicom valve; 7. Water pump inlet valve; 8 , Backflow valve; 9, A medicine box outlet valve; 10, A cleaning medicine box; 11, B cleaning medicine box; 12, B medicine box outlet valve; 13, water tank outlet valve; 14, cleaning water tank; 15, membrane wire hanging rack; 16. backwash feed valve; 17. forward wash feed valve; 18. forward wash water distribution pipe; 19. temperature probe; 20. temperature display; 21. aeration valve; 22. steam valve; 23. steam 24, aeration pipe; 25, water tank discharge valve; 26, pressure gauge; 27, A medicine box vent valve; 28, B medicine box vent valve.

detailed description

Aiming at the problems existing in traditional cleaning methods, the present invention provides a submerged ultrafiltration membrane off-line cleaning device. The device has reasonable structure, convenient use, safety and reliability, and can effectively reduce cleaning costs, improve cleaning effects, and prolong ultrafiltration. membrane life.

The present invention will be described in further detail below in conjunction with the accompanying drawings. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the present invention, so they only show the configurations related to the present invention.

Referring to Fig. 1, the present invention mainly includes filter venting valve 1, precision filter 2, filter outlet valve 3, filter inlet valve 4, cleaning water pump 5, Unicom valve 6, water pump inlet valve 7, return valve 8, medicine A Box outlet valve 9, A cleaning medicine box 10, B cleaning medicine box 11, B medicine box outlet valve 12, water tank outlet valve 13, cleaning water tank 14, membrane wire hanger 15, backwashing feed valve 16, forward washing feed Valve 17, washing water distribution pipe 18, temperature probe 19, temperature display screen 20, aeration valve 21, steam valve 22, steam pipe 23, aeration pipe 24, water tank discharge valve 25, pressure gauge 26, medicine box A vent valve 27. B medicine box vent valve 28.

The aeration valve 21 and the aeration pipe 24 form an aeration system, and the inlet end of the aeration valve 21 is connected with a high-pressure gas source.

The aeration pipe 24 is located in the cleaning liquid at the bottom of the cleaning water tank 14, and is connected with the gas outlet of the aeration valve 21 through a pipeline, and the aeration intensity can be controlled by the aeration valve 21 when the ultrafiltration membrane is cleaned. In the present invention, compressed air is used as the high-pressure air source, and the air inlet end of the aeration valve 21 is connected with the main compressed air pipeline for production.

A temperature probe 19, a temperature display screen 20, a steam valve 22, and a steam pipe 23 constitute a cleaning liquid heating system. The steam valve 22 is connected to the main steam pipeline for production. When the steam valve 22 is opened, the steam enters the cleaning water tank 14 through the steam pipe 23. In the cleaning liquid, the cleaning liquid is heated, and the temperature of the cleaning liquid can be controlled by the steam valve 22 when cleaning the ultrafiltration membrane. The temperature probe 19 and the temperature display screen 20 are used to measure and display the cleaning fluid temperature.

When the invention is used, the cleaning flow rate, cleaning time, cleaning liquid temperature, concentration of cleaning agent (cleaning agent A and cleaning agent B) and aeration intensity can be precisely controlled according to the pollution degree of the membrane element, which cannot be achieved by online cleaning.

The cleaning flow rate is preferably the flow rate of 2-4 times the membrane flux in normal operation. The cleaning time is preferably 100-120 minutes. If the adhesion of pollutants is strong, intermittent aeration can be used to strengthen air scrubbing during cleaning to further improve the cleaning effect.

During use, the temperature of the cleaning solution can be appropriately increased within the allowable operating temperature range of the ultrafiltration membrane module to increase the solubility of pollutants and reaction products. The temperature of the cleaning solution is preferably 35°C-39°C.

When in use, within the allowable concentration range of the ultrafiltration membrane module, the concentration of the cleaning agent can be appropriately increased to increase the penetration of the cleaning agent into the dirt layer. The pH control range of the cleaning solution is preferably 2-13, and the concentration control range of sodium hypochlorite cleaning solution is preferably 0.5 %-0.8%.

The advantages and positive effects of the present invention are: the cleaning method of the submerged ultrafiltration membrane is improved from online cleaning to offline cleaning. Long service life, and reduce cleaning water consumption and chemical consumption.

The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention, and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still belong to the scope covered by the patent of the present invention.

Claims (10)

1. The immersed ultrafiltration membrane off-line cleaning device is characterized by comprising a cleaning water tank (14), a cleaning liquid supply system, a membrane wire hanger (15) and a forward cleaning water distribution pipeline (18), wherein the forward cleaning water distribution pipeline (18) is installed on the lower portion of a top plate of the cleaning water tank (14) and is connected with the cleaning liquid supply system through a forward cleaning feed valve (17), the membrane wire hanger (15) is installed below the forward cleaning water distribution pipeline (18), the water distribution pipeline inside the membrane wire hanger (15) is connected with the cleaning liquid supply system through a backwashing feed valve (16), the cleaning water tank (14) is provided with a cleaning liquid heating system and an aeration system, and the bottom of the cleaning water tank (14) is connected with the cleaning liquid supply system through a water tank outlet valve (13).

2. An immersed ultrafiltration membrane off-line cleaning device according to claim 1, wherein the cleaning solution heating system comprises a steam valve (22) and a steam pipe (23), the steam inlet end of the steam pipe (23) is connected with a steam source through the steam valve (22), and the steam outlet end is positioned in the cleaning solution below the inside of the cleaning water tank (14).

3. An immersed ultrafiltration membrane off-line cleaning device according to claim 2, wherein the cleaning solution heating system further comprises a cleaning solution temperature measuring device, the cleaning solution temperature measuring device comprises a temperature probe (19) and a temperature display screen (20), the temperature probe (19) is installed below the inside of the cleaning water tank (14), the temperature display screen (20) is installed outside the cleaning water tank (14), and the input end of the temperature display screen (20) is connected with the signal output end of the temperature probe (19) through a cable.

4. An immersed ultrafiltration membrane off-line cleaning device according to any one of claims 1 to 3, wherein the aeration system comprises an aeration valve (21) and an aeration pipe (24), the aeration pipe (24) is transversely arranged in the cleaning liquid below the inside of the cleaning water tank (14), an air outlet on the aeration pipe (24) faces upwards, and an air inlet is connected with a high-pressure air source through the aeration valve (21).

5. An immersed ultrafiltration membrane off-line cleaning device according to claim 4, wherein the cleaning liquid supply system comprises a cleaning water pump (5), an A cleaning medicine box (10) and a B cleaning medicine box (11), a liquid inlet of the cleaning water pump (5) is respectively connected with liquid outlets at the bottoms of the A cleaning medicine box (10), the B cleaning medicine box (11) and the cleaning water tank (14) through an A medicine box outlet valve (9), a B medicine box outlet valve (12) and a water tank outlet valve (13), and a liquid outlet of the cleaning water pump (5) is connected with a forward washing feed valve (17) and a backwashing feed valve (16) through a communicating valve (6).

6. An off-line cleaning device for an immersed ultrafiltration membrane according to claim 5, wherein the cleaning solution supply system further comprises a precision filter (2), a filter outlet valve (3) and a filter inlet valve (4), wherein a liquid inlet of the precision filter (2) is connected with a liquid outlet of a cleaning water pump (5) through the filter inlet valve (4), and a liquid outlet is connected with a forward washing feed valve (17) and a backwashing feed valve (16) through the filter outlet valve (3).

7. An immersed ultrafiltration membrane off-line cleaning device according to claim 6, wherein a water pump inlet valve (7) is arranged between the A medicine box outlet valve (9), the B medicine box outlet valve (12), the water box outlet valve (13) and a liquid inlet of the cleaning water pump (5), and a return valve (8) is arranged between a liquid inlet end of the water pump inlet valve (7) and a liquid outlet of the cleaning water pump (5).

8. The submerged ultrafiltration membrane off-line cleaning device as claimed in claim 7, characterized in that a pressure gauge (26) is installed at the liquid outlet of the cleaning water pump (5).

9. An immersed ultrafiltration membrane off-line cleaning device according to claim 8, wherein emptying valves are mounted at the bottoms of the precision filter (2), the cleaning agent box A (10) and the cleaning agent box B (11).

10. The submerged ultrafiltration membrane off-line cleaning device of claim 9, wherein the high pressure air source is compressed air.

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