Large-scale seawater desalination ultrafiltration pretreatment device

Abstract

The utility model discloses a large-scale sea water desalination ultrafiltration pretreatment device which comprises an ultrafiltration membrane assembly, wherein the water inlet side of the ultrafiltration membrane assembly is connected with a water inlet pipe, a chemical cleaning water inlet pipe, a backwashing emptying pipe and a gas washing air inlet pipe; the water outlet side of the ultrafiltration membrane assembly is connected with a chemical cleaning circulating pipe, a concentrated water exhaust pipe, a backwashing drain pipe, a backwashing water inlet pipe and a water production pipe, the water inlet pipe, the chemical cleaning water inlet pipe, the backwashing drain pipe and the gas washing gas inlet pipe are connected with the ultrafiltration membrane assembly through a lower transverse section pipeline, and the lower transverse section pipeline is provided with a water inlet pressure detection sampling point. The chemical cleaning circulating pipe, the concentrated water exhaust pipe and the backwashing drainage pipe are connected with the ultrafiltration membrane assembly through a waste water pipe, the backwashing water inlet pipe and the water production pipe are connected with the ultrafiltration membrane assembly through an upper transverse section pipeline, the upper transverse section pipeline is provided with a water inlet pressure detection sampling point, the water production pipe is provided with a flow detection point, the rear end of the water production pipe is provided with a turbidity detection point, and the upper transverse section pipeline is provided with a water outlet pressure detection point. And the self-cleaning capacity is higher, so that the membrane module can efficiently operate for a long time.

Description

Technical Field

[0001] The utility model belongs to the technical field of seawater desalination, and in particular relates to a large-scale seawater desalination ultrafiltration pretreatment device. Background Art

[0002] Ultrafiltration membrane technology is a membrane permeation separation technology that can purify, separate or concentrate solutions, and is between microfiltration and nanofiltration. Currently, ultrafiltration membrane groups are widely used in water treatment projects, and ultrafiltration technology plays an increasingly important role in reverse osmosis pretreatment, drinking water treatment, and reclaimed water reuse. Applied in large seawater plants, in order to meet the uninterrupted water supply needs of users, the ultrafiltration membrane group as a reverse osmosis pretreatment process needs to operate uninterruptedly. The membrane group is prone to scaling, which reduces the water production capacity, and the operation time is too long, and the membrane group itself has many safety hazards. Utility Model Content

[0003] In order to overcome the above technical problems existing in the prior art, the purpose of the utility model is to provide a large-scale seawater desalination ultrafiltration pretreatment device with high automation and self-cleaning capabilities, so that the membrane group can operate efficiently and safely for a long time.

[0004] The utility model provides a large-scale seawater desalination ultrafiltration pretreatment device, comprising an ultrafiltration membrane assembly, wherein the water inlet side of the ultrafiltration membrane assembly is connected to a water inlet pipe, a chemical cleaning water inlet pipe, a backwashing emptying pipe, and an air washing inlet pipe, and the water outlet side of the ultrafiltration membrane assembly is connected to a chemical cleaning circulation pipe, a concentrated water exhaust pipe, a backwashing drain pipe, a backwashing water inlet pipe, and a water production pipe, wherein the water inlet pipe, the chemical cleaning water inlet pipe, the backwashing emptying pipe, and the air washing inlet pipe are connected to the ultrafiltration membrane assembly through a lower transverse section pipeline, wherein a water inlet pressure detection sampling point is arranged on the lower transverse section pipeline, wherein the chemical cleaning circulation pipe, the concentrated water exhaust pipe, and the backwashing drain pipe are connected to the ultrafiltration membrane assembly through a wastewater pipe, wherein the backwashing water inlet pipe and the water production pipe are connected to the ultrafiltration membrane assembly through an upper transverse section pipeline, wherein a water inlet pressure detection sampling point is arranged on the upper transverse section pipeline, wherein a flow detection point is arranged at the front end of the water production pipe, and a turbidity detection point is arranged at the rear end of the water production pipe.

[0005] The chemical cleaning circulation pipe, concentrated water exhaust pipe and backwash drainage pipe are respectively provided with a chemical cleaning circulation pneumatic valve, a concentrated water exhaust pneumatic valve and a backwash drainage pneumatic valve.

[0006] The backwash water inlet pipe is provided with a backwash water inlet pneumatic valve, and the water production pipe is provided with a water production regulating pneumatic valve and a water production manual valve in sequence.

[0007] The flow detection point is arranged before the water production regulating pneumatic valve and the water production manual valve, and the turbidity detection point is arranged after the water production regulating pneumatic valve and the water production manual valve.

[0008] The chemical cleaning water inlet pipe is provided with a chemical cleaning water inlet pneumatic valve, the backwash exhaust pipe is provided with a backwash exhaust pneumatic valve, the water inlet pipe is provided with a water inlet pneumatic valve and a water inlet manual valve in sequence, and the air washing air inlet pipe is provided with an air washing air inlet pneumatic valve.

[0009] The utility model provides a large-scale seawater desalination ultrafiltration pretreatment device, which has the beneficial effect that a single set of ultrafiltration membrane groups is provided with multiple parameter monitoring points, and the flow rate and pressure fed back by the instrument can be used to grasp the operating status of the membrane group in real time, find problems in time, and ensure the safe operation of the membrane group; turbidity monitoring is set at the outlet of the membrane group water production, and the filtering effect of the membrane group is fed back in real time to monitor whether the water quality of the produced water meets the water inlet requirements of the next level system; the whole set of equipment can realize automatic backwashing, and cooperate with regular chemical cleaning to enable the membrane group to operate efficiently for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0011] Note in the figure:

[0012] 1. Chemical cleaning circulation pneumatic valve; 2. Concentrated water exhaust pneumatic valve; 3. Backwash drainage pneumatic valve; 4. Water production regulation pneumatic valve; 5. Water production manual valve; 6. Backwash water inlet pneumatic valve; 7. Concentrated water exhaust pipe; 8. Backwash exhaust pneumatic valve; 9. Water inlet pneumatic valve; 10. Water inlet manual valve; 11. Air washing air inlet pneumatic valve; 12. Water inlet pressure detection sampling point II; 13. Flow detection point; 14. Turbidity detection point; 15. Water inlet pressure detection sampling point I; 16. Chemical cleaning circulation pipe; 17. Concentrated water exhaust pipe; 18. Backwash drainage pipe; 19. Water production pipe; 20. Backwash water inlet pipe; 21. Chemical cleaning water inlet pipe; 22. Backwash drain pipe; 23. Water inlet pipe; 24. Air washing air inlet pipe. DETAILED DESCRIPTION

[0013] With reference to the accompanying drawings and in combination with an embodiment, a large-scale seawater desalination ultrafiltration pretreatment device provided by the utility model is described in detail below.

[0014] Example

[0015] Reference Figure 1A large-scale seawater desalination ultrafiltration pretreatment device of this embodiment includes an ultrafiltration membrane assembly, the water inlet side of the ultrafiltration membrane assembly is connected to an inlet pipe 23, a chemical cleaning inlet pipe 21, a backwashing drain pipe 22, and an air washing inlet pipe 24, and the water outlet side of the ultrafiltration membrane assembly is connected to a chemical cleaning circulation pipe 16, a concentrated water exhaust pipe 17, a backwashing drain pipe 18, a backwashing inlet pipe 20, and a water production pipe 19. The inlet pipe 23, the chemical cleaning inlet pipe 21, the backwashing drain pipe 22, and the air washing inlet pipe 24 are connected to the lower The transverse pipeline is connected to the ultrafiltration membrane assembly, and a water inlet pressure detection sampling point I15 is provided on the lower transverse pipeline. The chemical cleaning circulation pipe 16, the concentrated water exhaust pipe 17, and the backwash drainage pipe 18 are connected to the ultrafiltration membrane assembly through the wastewater pipe. The backwash water inlet pipe 20 and the water production pipe 19 are connected to the ultrafiltration membrane assembly through the upper transverse pipeline. A water inlet pressure detection sampling point II12 is provided on the upper transverse pipeline. A flow detection point 13 is provided at the front end of the water production pipe 19, and a turbidity detection point 14 is provided at the rear end of the water production pipe 19.

[0016] The chemical cleaning circulation pipe 16 , the concentrated water exhaust pipe 17 , and the backwash drainage pipe 18 are respectively provided with a chemical cleaning circulation pneumatic valve 1 , a concentrated water exhaust pneumatic valve 2 , and a backwash drainage pneumatic valve 3 .

[0017] The backwash water inlet pipe 20 is provided with a backwash water inlet pneumatic valve 6, and the water production pipe 19 is provided with a water production regulating pneumatic valve 4 and a water production manual valve 5 in sequence.

[0018] The flow detection point 13 is arranged before the water production regulating pneumatic valve 4 and the water production manual valve 5 , and the turbidity detection point 14 is arranged after the water production regulating pneumatic valve 4 and the water production manual valve 5 .

[0019] The chemical cleaning water inlet pipe 21 is provided with a chemical cleaning water inlet pneumatic valve 7, the backwash exhaust pipe 22 is provided with a backwash exhaust pneumatic valve 8, the water inlet pipe 23 is provided with a water inlet pneumatic valve 9 and a water inlet manual valve 10 in sequence, and the air washing air inlet pipe 24 is provided with an air washing air inlet pneumatic valve 11.

[0020] When the equipment is operating normally, the working process is as follows:

[0021] 1. Normal water production: When the system starts filtering, the raw water pump supplies water to the ultrafiltration system. The ultrafiltration system works in cross-flow filtration mode. The produced water enters the inner cavity of the membrane fiber under positive pressure and is collected. Impurities such as suspended matter, colloids and macromolecular organic matter will be trapped on the outer surface of the membrane fiber.

[0022] Open the ultrafiltration system water inlet pneumatic valve, water inlet manual valve, water production regulating pneumatic valve, and water production manual valve, and close other automatic valves. The membrane filtration working time is 20 to 60 minutes. At the beginning of water inlet, air may remain in the membrane assembly. In order to prevent the membrane assembly or membrane wire from being damaged due to water hammer, water needs to be slowly introduced to fully remove the air.

[0023] 2. Water backwashing: In the opposite direction of the water flow during the filtration process, open the backwash water inlet valve and the backwash air exhaust valve, close other automatic valves, start the backwash pump, and transfer the ultrafiltration water from the water production side of the hollow fiber membrane to the water inlet side. Because water passes through the hollow fiber membrane from the opposite direction, it washes away the pollutants formed on the outer surface of the membrane during the filtration process. The cleaning time depends on the specific situation, generally 20 to 60 seconds;

[0024] 3. Air and water backwashing: While the membrane assembly is backwashing, open the air-washing air inlet pneumatic valve, and let a certain amount of oil-free compressed air pass through the water inlet surface of the hollow fiber membrane. The ultrafiltration water is pressed out from the inside of the membrane as the inlet water. The pollutants formed on the outer surface of the membrane during the filtration process are washed away by the mixed oscillation of compressed air and water. The cleaning time depends on the specific situation, generally 20 to 60 seconds;

[0025] 4. Drainage: Open the backwash drainage pneumatic valve, concentrated water exhaust pneumatic valve, and backwash exhaust pneumatic valve, and close the other automatic valves to drain the concentrated sewage remaining in the membrane assembly and membrane device pipeline;

[0026] 5. Forward flushing: Open the water inlet pneumatic valve, water inlet manual valve, and backwash drainage pneumatic valve, and close the remaining automatic valves. In this state, the water flow will flush the pollutants on the membrane surface to enhance the backwash effect.

[0027] Each set of ultrafiltration membrane group is equipped with chemical cleaning pipeline, see Figure 1 During chemical cleaning, open the chemical cleaning water inlet pneumatic valve, the chemical cleaning circulation pneumatic valve, and start the chemical cleaning pump. The chemical agents enter the inner cavity of the membrane fiber under positive pressure drive to remove the pollutants in the inner cavity of the membrane fiber more thoroughly. The chemical cleaning agents are circulated back to the cleaning water tank. The cleaning time depends on the specific situation.

[0028] Multiple online instruments are used for real-time monitoring and alarm to ensure the safe operation of the membrane group. The membrane group can automatically perform water backwashing, air-water backwashing and other functions to ensure the long-term and efficient operation of the membrane group.

Claims

1. A large-scale seawater desalination ultrafiltration pretreatment device, characterized in that: It comprises an ultrafiltration membrane assembly, wherein the water inlet side of the ultrafiltration membrane assembly is connected to a water inlet pipe, a chemical cleaning water inlet pipe, a backwash drain pipe, and an air wash inlet pipe, and the water outlet side of the ultrafiltration membrane assembly is connected to a chemical cleaning circulation pipe, a concentrated water exhaust pipe, a backwash drain pipe, a backwash water inlet pipe, and a produced water pipe; the water inlet pipe, the chemical cleaning water inlet pipe, the backwash drain pipe, and the air wash inlet pipe are connected to the ultrafiltration membrane assembly through a lower transverse section pipeline, and a water inlet pressure detection sampling point is provided on the lower transverse section pipeline; the chemical cleaning circulation pipe, the concentrated water exhaust pipe, and the backwash drain pipe are connected to the ultrafiltration membrane assembly through a wastewater pipe; the backwash water inlet pipe and the produced water pipe are connected to the ultrafiltration membrane assembly through an upper transverse section pipeline, and a water inlet pressure detection sampling point is provided on the upper transverse section pipeline; a flow detection point is provided at the front end of the produced water pipe, and a turbidity detection point is provided at the rear end of the produced water pipe.

2. A large-scale seawater desalination ultrafiltration pretreatment device according to claim 1, characterized in that: The chemical cleaning circulation pipe, concentrated water exhaust pipe and backwash drainage pipe are respectively provided with a chemical cleaning circulation pneumatic valve, a concentrated water exhaust pneumatic valve and a backwash drainage pneumatic valve.

3. A large-scale seawater desalination ultrafiltration pretreatment device according to claim 1, characterized in that: The backwash water inlet pipe is provided with a backwash water inlet pneumatic valve, and the water production pipe is provided with a water production regulating pneumatic valve and a water production manual valve in sequence.

4. A large-scale seawater desalination ultrafiltration pretreatment device according to claim 3, characterized in that: The flow detection point is arranged before the water production regulating pneumatic valve and the water production manual valve, and the turbidity detection point is arranged after the water production regulating pneumatic valve and the water production manual valve.

5. A large-scale seawater desalination ultrafiltration pretreatment device according to claim 1, characterized in that: The chemical cleaning water inlet pipe is provided with a chemical cleaning water inlet pneumatic valve, the backwash exhaust pipe is provided with a backwash exhaust pneumatic valve, the water inlet pipe is provided with a water inlet pneumatic valve and a water inlet manual valve in sequence, and the air washing air inlet pipe is provided with an air washing air inlet pneumatic valve.

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