CN220485407U - Bitter two-stage nanofiltration device - Google Patents

Abstract

The utility model discloses a two-stage nanofiltration device for brackish water, which includes a first-level nanofiltration equipment and a second-level nanofiltration equipment. Both the first-level nanofiltration equipment and the second-level nanofiltration equipment include concentrated water separated by a nanofiltration membrane. The water chamber and the clean water chamber. The concentrated water chamber of the first-level nanofiltration equipment is connected to the water inlet pipe through the pretreatment filtration equipment, and the water inlet pipe is equipped with a driving pump. The clean water chamber of the first-level nanofiltration equipment and the concentrated water chamber of the second-level nanofiltration equipment are connected. The water cavity is connected, the clean water cavity of the second-level nanofiltration equipment is connected to the water production pipe, the concentrated water cavity of the first-level nanofiltration equipment is connected to the water inlet pipe through the first return pipeline, and the concentrated water cavity of the second-level nanofiltration equipment is connected through the second return flow The pipeline is connected to the concentrated water chamber of the first-level nanofiltration equipment. One-way valves are installed on both the first return pipeline and the second return pipeline. This solution improves the purification effect of brackish water through two-stage filtration; at the same time, The brackish water can be filtered multiple times before being discharged to avoid the waste of water resources caused by direct discharge.

Description

A two-stage nanofiltration device for brackish water

Technical field

The utility model relates to the technical field of brackish water treatment, in particular to a two-stage nanofiltration device for brackish water.

Background technique

Our country’s water resources are scarce and uneven, especially in the northwest region. Many water sources are brackish. Long-term drinking of brackish water without effective purification will cause huge damage to the human body. For this reason, our country has established rural safe drinking water projects in many rural areas. Among them, nanofiltration technology has gradually become the mainstream process used in water purification equipment, which can achieve deep purification of drinking water.

Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The nanofiltration membrane it relies on has a pore size in the range of several nanometers and a molecular weight cutoff in the range of 80-1000. It is used to Substances with smaller relative molecular weights, such as inorganic salts or small molecular organic substances such as glucose and sucrose, are separated from solvents to achieve separation effects; nanofiltration is mainly used in the purification of drinking water and industrial water, wastewater purification treatment, and process fluids. Concentration of valuable ingredients, etc.

However, the existing nanofiltration devices for drinking water are only equipped with one-stage nanofiltration, which has poor purification effect and low efficiency during the filtration process. Moreover, the filtered concentrated water is discharged directly without recycling, which can easily cause a waste of water resources. ; At the same time, the nanofiltration membrane structure of the existing nanofiltration equipment is simple, resulting in a small contact area between the nanofiltration membrane and water during the filtration process, thus affecting the filtration efficiency.

Utility model content

In view of the above-mentioned deficiencies of the prior art, the present utility model provides a two-stage brackish water nanofiltration device, which solves the problems of low filtration efficiency of existing nanofiltration equipment and easy waste of water resources.

In order to achieve the above purpose, the technical solution adopted by the present utility model is:

A two-stage brackish water nanofiltration device is provided, which includes a first-level nanofiltration device and a second-level nanofiltration device. Both the first-level nanofiltration device and the second-level nanofiltration device include a concentrated water chamber and clean water separated by a nanofiltration membrane. cavity, the concentrated water cavity of the first-level nanofiltration equipment is connected to the water inlet pipe through the pretreatment filtering equipment, and the water inlet pipe is provided with a driving pump, and the clean water cavity of the first-level nanofiltration equipment is connected to the concentrated water cavity of the second-level nanofiltration equipment. The clean water chamber of the second-level nanofiltration equipment is connected to the water production pipe, the concentrated water chamber of the first-level nanofiltration equipment is connected to the water inlet pipe through the first return pipe, and the concentrated water chamber of the second-level nanofiltration equipment is connected to the first return pipe through the second return pipe. The concentrated water chamber of the first-level nanofiltration equipment is connected, and one-way valves are provided on both the first return pipeline and the second return pipeline.

Further, both the first-level nanofiltration equipment and the second-level nanofiltration equipment include a shell, a mounting plate is provided in the shell, a number of water holes are provided on the installation plate, and a nanofiltration membrane module is provided at one end of the water hole, and the nanofiltration membrane module is provided at one end of the water hole. The filter membrane assembly is located in the concentrated water chamber. The nanofiltration membrane assembly includes a cylindrical nanofiltration membrane. The two ends of the cylindrical nanofiltration membrane are respectively provided with plugs and collars. The outer wall of the collar is threaded with the inner wall of the water hole. Fixed connection, the inner cavity of the cylindrical nanofiltration membrane is connected with the clean water cavity through the water hole.

Further, a supporting steel mesh is provided on both the outer and inner walls of the cylindrical nanofiltration membrane, and the two ends of the supporting steel mesh are respectively fixed on the plug and the collar.

Further, the front end of the housing is provided with a detachable end cover.

Further, the clean water chamber of the secondary nanofiltration equipment is connected to the backwash pipeline, and a backwash pump is provided on the backwash pipeline, and a water outlet branch is provided on the connection pipeline between the drive pump and the pretreatment filtration equipment. The concentrated water chamber of the nanofiltration equipment and the secondary nanofiltration equipment is equipped with a drainage pipe, a water outlet branch, a drainage pipe, a water production pipe, a first return pipeline, a second return pipeline, the water outlet end of the driving pump and backwashing The water outlet end of the pump is equipped with an on-off valve, and the on-off valve that drives the pump is located at the front end of the water outlet branch.

Further, the water outlets of the driving pump and the backwash pump are equipped with automatic pressure regulating valves, and pressure gauges are installed on the side walls of the concentrated water chambers of the first-level nanofiltration equipment and the second-level nanofiltration equipment.

Further, the pretreatment filtration equipment includes a filter screen, an activated carbon filter and/or a security filter.

The beneficial effects of this utility model are:

1. This solution uses one-stage nanofiltration equipment and two-stage nanofiltration equipment to perform two-stage filtration of brackish water. Compared with single-stage nanofiltration, it improves the purification effect of brackish water; at the same time, after filtration by the first-stage nanofiltration equipment The concentrated water can flow back to the inlet pipe through the first return line, and the concentrated water filtered by the second-level nanofiltration equipment can flow back to the first-level nanofiltration equipment through the second return line, thereby achieving multiple filtration of brackish water. before discharging to avoid wasting water resources caused by direct discharge.

2. By arranging several cylindrical nanofiltration membranes, the contact area between the nanofiltration membrane and water can be increased in a limited shell space, thereby improving the filtration efficiency; at the same time, the cylindrical nanofiltration membranes are easy to disassemble and assemble for convenience. Later maintenance and replacement; the cylindrical nanofiltration membrane can be supported by the supporting steel mesh to prevent the side wall of the cylindrical nanofiltration membrane from being sunk or bulged during pressure filtration, causing the cylindrical nanofiltration membrane to fail.

3. By setting up the backwash pipeline and water outlet branch, the backwash of the first-level nanofiltration equipment, the second-level nanofiltration equipment and the pretreatment filtration equipment can be realized to avoid equipment clogging and ensure purification during normal operation of the device of this solution. efficiency and purification effect.

Description of the drawings

Figure 1 is a schematic structural diagram of the two-stage brackish water nanofiltration device of this solution.

Figure 2 is a schematic structural diagram of the first-level nanofiltration equipment.

Among them, 1. First-level nanofiltration equipment, 2. Second-level nanofiltration equipment, 3. Nanofiltration membrane, 4. Concentrated water chamber, 5. Clean water chamber, 6. Pretreatment filtration equipment, 7. Water inlet pipe, 8. Drive Pump, 9. Water production pipe, 10. First return pipeline, 11. Second return pipeline, 12. One-way valve, 13. Shell, 14. Installation plate, 15. Water hole, 16. Cylindrical tank Filter membrane, 17. Plug, 18. Collar, 19. End cap, 20. Backwash pipeline, 21. Backwash pump, 22. Water outlet branch, 23. Drainage pipe, 24. On/off valve, 25. Automatic Pressure regulating valve, 26, pressure gauge.

Detailed ways

Specific embodiments of the present utility model are described below to facilitate those skilled in the art to understand the utility model. However, it should be clear that the present utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the technical field, as long as Various changes are obvious within the spirit and scope of the present utility model as defined and determined by the appended claims, and all utility model creations utilizing the concepts of the present utility model are protected.

Example 1

As shown in Figure 1, the brackish water two-stage nanofiltration device of this solution includes first-level nanofiltration equipment 1 and second-level nanofiltration equipment 2. Both first-level nanofiltration equipment 1 and second-level nanofiltration equipment 2 include nanofiltration equipment. The concentrated water chamber 4 and the clean water chamber 5 are separated by the membrane 3. The concentrated water chamber 4 of the first-level nanofiltration equipment 1 is connected to the water inlet pipe 7 through the pretreatment filtration equipment 6, and the water inlet pipe 7 is provided with a driving pump 8. The pretreatment filtration The equipment 6 includes a filter screen and an activated carbon filter and/or a security filter. The clean water chamber 5 of the first-level nanofiltration equipment 1 is connected to the concentrated water chamber 4 of the second-level nanofiltration equipment 2. The clean water chamber 5 of the second-level nanofiltration equipment 2 is Connected to the water production pipe 9, the concentrated water chamber 4 of the first-level nanofiltration equipment 1 is connected to the water inlet pipe 7 through the first return pipeline 10, and the concentrated water chamber 4 of the second-level nanofiltration equipment 2 is connected to a second return pipeline 11 through the second return pipeline 11. The concentrated water chamber 4 of the first-level nanofiltration equipment 1 is connected. The first return pipeline 10 and the second return pipeline 11 are both provided with one-way valves 12. The concentrated water of the first-level nanofiltration equipment 1 and the second-level nanofiltration equipment 2 Drainage pipes 23 are provided on each cavity 4 .

During implementation, the pore size of the nanofiltration membrane 3 is 1 to 2 nm. The pore size of the nanofiltration membrane 3 in the first-level nanofiltration equipment 1 is larger than the pore size of the nanofiltration membrane 3 in the second-level nanofiltration equipment 2, and the materials are all made of polyamide. This makes the nanofiltration membrane 3 have good film-forming properties, thermal stability, chemical stability, high mechanical strength, resistance to acid, alkali and microbial erosion, resistance to chlorine and other oxidizing substances, and also has high water flux and high salt interception efficiency, resistance to colloid and suspended matter pollution, and low price; the operating pressure of the driving pump 8 is not higher than 0.85Mpa, the working pressure of the first-level nanofiltration equipment 1 is between 0.65-0.85Mpa, and the operating pressure of the second-level nanofiltration equipment 2 The working pressure is between 0.5-0.65Mpa, which is beneficial to preventing serious deformation of the nanofiltration membrane 3, thereby increasing the service life of the nanofiltration membrane 3.

This solution uses primary nanofiltration equipment 1 and secondary nanofiltration equipment 2 to perform dual-stage filtration of brackish water. Compared with single-stage nanofiltration, the purification effect of brackish water is improved; at the same time, primary nanofiltration equipment 1 filters The concentrated water can be returned to the water inlet pipe 7 through the first return line 10, and the concentrated water filtered by the second-level nanofiltration equipment 2 can be returned to the first-level nanofiltration equipment 1 through the second return line 11, thereby realizing the control. The brackish water is filtered multiple times and then discharged through the drainage pipe 23 to avoid waste of water resources caused by direct discharge.

Example 2

As shown in Figure 2, on the basis of Example 1, this embodiment provides specific solutions for the first-level nanofiltration equipment 1 and the second-level nanofiltration equipment 2, wherein the first-level nanofiltration equipment 1 and the second-level nanofiltration equipment 2 have the same structure, including a shell 13. The front end of the shell 13 is provided with a detachable end cover 19. The shell 13 is provided with a mounting plate 14. The mounting plate 14 is provided with a number of water holes 15. The water holes One end of 15 is provided with a nanofiltration membrane 3 component, and the nanofiltration membrane 3 component is located in the concentrated water chamber 4. The nanofiltration membrane 3 component includes a cylindrical nanofiltration membrane 16, and the two ends of the cylindrical nanofiltration membrane 16 are respectively provided with plugs. The head 17 and the collar 18, the outer wall of the collar 18 and the inner wall of one end of the water hole 15 are fixedly connected through threaded fit, the inner cavity of the cylindrical nanofiltration membrane 16 is connected with the clean water chamber 5 through the water hole 15, and the cylindrical nanofiltration A supporting steel mesh is provided on both the outer and inner walls of the membrane 16, and the two ends of the supporting steel mesh are respectively fixed on the plug 17 and the collar 18.

In this solution, by arranging several cylindrical nanofiltration membranes 16, the contact area between the nanofiltration membrane 3 and water can be increased in the limited space of the housing 13, thereby improving the filtration efficiency; at the same time, the cylindrical nanofiltration membranes 16 can be disassembled and assembled Convenient to facilitate later maintenance and replacement; the cylindrical nanofiltration membrane 16 can be supported by the supporting steel mesh to prevent the side wall of the cylindrical nanofiltration membrane 16 from being sunk or bulged during pressure filtration, causing the cylindrical shape Nanofiltration membrane 16 failed.

Example 3

This embodiment is further limited on the basis of Embodiment 1. The clean water chamber 5 of the secondary nanofiltration equipment 2 is connected to the backwash pipeline 20, and the backwash pipeline 20 is provided with a backwash pump 21 to drive The connection pipeline between the pump 8 and the pretreatment filtering equipment 6 is provided with a water outlet branch 22, a water outlet branch 22, a drainage pipe 23, a water production pipe 9, a first return pipeline 10, a second return pipeline 11, and a driving pump. 8 and the water outlet of the backwash pump 21 are provided with a switch valve 24. The switch valve 24 of the drive pump 8 is located at the front end of the water outlet branch 22. The water outlets of the drive pump 8 and the backwash pump 21 are equipped with automatic valves 24. The pressure regulating valve 25, the side walls of the concentrated water chamber 4 of the primary nanofiltration equipment 1 and the secondary nanofiltration equipment 2 are all provided with pressure gauges 26.

This solution can realize the backwashing of the first-level nanofiltration equipment 1, the second-level nanofiltration equipment 2 and the pretreatment filtration equipment 6 by setting up the backwashing pipeline 20 and the water outlet branch 22, and during the backwashing, the system is closed The drainage pipe 23, the water production pipe 9, the first return pipe 10, the second return pipe 11 and the switch valve 24 at the water outlet of the drive pump 8 allow the reverse flushing water flow to pass through the clean water chamber 5 of the secondary nanofiltration equipment 2 in sequence. , the concentrated water chamber 4, the clean water chamber 5 of the first-level nanofiltration equipment 1, the concentrated water chamber 4, and the pretreatment filtration equipment 6 are discharged through the water outlet branch 22 to achieve the purpose of cleaning the entire filtration equipment, avoid clogging of the equipment, and ensure The purification efficiency and purification effect of the device of this solution during normal operation.

Claims (6)

1. The utility model provides a brackish water doublestage nanofiltration device which characterized in that, including one-level nanofiltration device and second grade nanofiltration device, one-level nanofiltration device and second grade nanofiltration device all include through nanofiltration membrane partition's dense water cavity and clear water cavity, one-level nanofiltration device's dense water cavity is connected with the inlet tube through pretreatment filtration device, and is provided with the actuating pump on the inlet tube, one-level nanofiltration device's clear water cavity is connected with second grade nanofiltration device's dense water cavity, second grade nanofiltration device's clear water cavity is connected with the water production pipe, one-level nanofiltration device's dense water cavity is connected with the inlet tube through first return line, second grade nanofiltration device's dense water cavity is connected with one-level nanofiltration device's dense water cavity through the second return line, all be provided with the check valve on first return line and the second return line;

the one-level nanofiltration equipment and the two-level nanofiltration equipment comprise a shell, a mounting plate is arranged in the shell, a plurality of water passing holes are formed in the mounting plate, one end of each water passing hole is provided with a nanofiltration membrane component, the nanofiltration membrane component is located in a concentrated water cavity, the nanofiltration membrane component comprises a cylindrical nanofiltration membrane, plugs and lantern rings are respectively arranged at two ends of the cylindrical nanofiltration membrane, the outer wall of the lantern ring is fixedly connected with the inner wall of each water passing hole through screw thread fit, and an inner cavity of the cylindrical nanofiltration membrane is communicated with a clear water cavity through the water passing holes.

2. The two-stage nanofiltration device for brackish water according to claim 1, wherein the outer side wall and the inner side wall of the cylindrical nanofiltration membrane are respectively provided with a supporting steel mesh, and two ends of the supporting steel mesh are respectively fixed on the plug and the lantern ring.

3. The brackish water dual stage nanofiltration device of claim 1 wherein the front end of the housing is provided with a removable end cap.

4. The brackish water double-stage nanofiltration device according to claim 1, wherein the clear water cavity of the secondary nanofiltration device is connected with a backwash pipeline, a backwash pump is arranged on the backwash pipeline, a water outlet branch is arranged on a connecting pipeline between the driving pump and the pretreatment filtration device, drain pipes are arranged on the concentrated water cavities of the primary nanofiltration device and the secondary nanofiltration device, and a switch valve is arranged on the water outlet branch, the drain pipe, the water production pipe, the first return pipeline, the second return pipeline, the water outlet end of the driving pump and the water outlet end of the backwash pump, and the switch valve of the driving pump is arranged at the front end of the water outlet branch.

5. The brackish water double-stage nanofiltration device according to claim 4, wherein the water outlet ends of the driving pump and the backwash pump are provided with automatic pressure regulating valves, and the side walls of the concentrated water chambers of the primary nanofiltration device and the secondary nanofiltration device are provided with pressure gauges.

6. The brackish water dual stage nanofiltration device of claim 1 wherein the pretreatment filtration equipment comprises a filter screen, an activated carbon filter, and/or a cartridge filter.