CN212576016U - Cleaning device for liquid drawn by forward osmosis system - Google Patents
Cleaning device for liquid drawn by forward osmosis system Download PDFInfo
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- CN212576016U CN212576016U CN202021081496.7U CN202021081496U CN212576016U CN 212576016 U CN212576016 U CN 212576016U CN 202021081496 U CN202021081496 U CN 202021081496U CN 212576016 U CN212576016 U CN 212576016U
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Abstract
The utility model provides a belt cleaning device of positive osmotic system draw liquid, include: the drawing liquid cleaning device comprises a water inlet tank, a booster pump, a security filter, a high-pressure pump, a circulating pump, a membrane filtering unit, a water production tank and a concentrated water tank; the booster pump is arranged on a first pipeline between the water inlet tank and the input end of the security filter; the output end of the cartridge filter is connected with the concentrated water tank through a second pipeline, and the high-pressure pump is arranged on the second pipeline; the circulating pump is arranged on the third pipeline; one end of the fourth pipeline is connected with a water production output end, and the other end of the fourth pipeline is connected with a water production tank. The utility model discloses a belt cleaning device of positive osmotic system draw liquid keeps circulating and draws liquid at a good clean state, has alleviateed the burden when drawing liquid recovery unit and positive osmotic system combined application, has reduced the dirty stifled risk of system, has improved and has drawn liquid recycle rate, the operating cost of lowering system.
Description
Technical Field
The utility model relates to an environmental protection technology field especially relates to a belt cleaning device of positive osmotic system draw liquid.
Background
The forward osmosis phenomenon is ubiquitous in nature, and the principle is as follows: the two solutions of different concentrations are separated by a membrane (perm-selective membrane) of an animal or plant, while pure water molecules permeate the membrane from the less concentrated solution into the more concentrated solution, thereby trapping the salts. The forward osmosis technology is a membrane separation process which utilizes a forward osmosis phenomenon and takes osmotic pressure difference at two sides of a selective osmosis membrane as a driving force to spontaneously realize water transfer.
The forward osmosis technology is gradually applied to the field of treating high-difficulty wastewater with high pollution because of good pollution blockage resistance and reversible pollution process. The forward osmosis technology needs to utilize the draw solution to provide a driving force to draw water molecules on the wastewater side to the draw solution side, so that the forward osmosis technology is often coupled with a draw solution recovery system in practical application to enable the draw solution to be recycled in the system. However, during the circulation of the draw solution, the contaminant in the raw water inevitably permeates the forward osmosis membrane and gradually accumulates in the draw solution, thereby causing the pollution of the draw solution. Generally, the anti-fouling performance of the drawing liquid recovery system is inferior to that of a forward osmosis system, the contaminated drawing liquid can increase the burden of the drawing liquid recovery system, and the fouling problem can be caused in severe cases, so that the system cannot normally operate. Therefore, how to maintain the cleanliness of the draw solution during the draw solution circulation is a crucial factor for maintaining stable operation of the forward osmosis system.
Disclosure of Invention
To the not enough among the above-mentioned prior art, the utility model provides a just osmotic system draws belt cleaning device of liquid washs drawing liquid through membrane filter unit, and the pollutant in the liquid is drawn in the interception to the solution is in just osmotic unit and drawing the system of liquid recovery unit coupling, draws the liquid and is polluted gradually because of the circulation process, causes the dirty stifled problem of system.
In order to achieve the above object, the utility model provides a belt cleaning device of positive osmotic system draw liquid, include: the device comprises a drawing liquid cleaning device, a water inlet tank, a booster pump, a safety filter, a high-pressure pump, a circulating pump, a membrane filtering unit, a water production tank and a concentrated water tank, wherein the drawing liquid cleaning device comprises the water inlet tank, the booster pump, the safety filter, the high-pressure pump, the circulating pump, the membrane filtering unit, the water production tank and the concentrated water tank; the booster pump is arranged on a first pipeline between the water inlet tank and the input end of the security filter; the output end of the cartridge filter is connected with the concentrated water tank through a second pipeline, and the high-pressure pump is installed on the second pipeline; the membrane filtration unit comprises a membrane filtration input end, a produced water output end and a concentrated water output end; the circulating pump is arranged on a third pipeline, one end of the third pipeline is communicated with the output end of the high-pressure pump through the second pipeline, and the other end of the third pipeline is connected with the membrane filtering input end; one end of a fourth pipeline is connected with the water production output end, and the other end of the fourth pipeline is connected with the water production tank; one end of a fifth pipeline is connected with the concentrated water output end, and the other end of the fifth pipeline is connected with the second pipeline and is positioned between the connecting part of the third pipeline and the second pipeline and the concentrated water tank.
Preferably, the membrane filtration unit adopts an ultrafiltration membrane or a nanofiltration membrane.
Preferably, a forward osmosis membrane unit comprises a raw water input end, a concentrated solution output end, a drawing solution input end and a drawing solution output end; the drawing liquid output end is connected with the water inlet tank of the drawing liquid cleaning device; the raw water input end is connected with the concentrated water tank of the drawing liquid cleaning device.
Preferably, a drawing liquid recovery unit comprises a dilute drawing liquid input end and a concentrated drawing liquid output end, the dilute drawing liquid input end is connected with the water production tank of the drawing liquid cleaning device, and the concentrated drawing liquid output end is connected with the drawing liquid input end of the forward osmosis membrane unit.
Preferably, the system further comprises a fifth pipeline and a valve, wherein one end of the fifth pipeline is connected with the drawn liquid output end, and the other end of the fifth pipeline is connected with the drawn liquid recovery unit; the valve is mounted on the fifth pipeline.
The utility model discloses owing to adopted above technical scheme, make it have following beneficial effect:
and cleaning the draw solution through the membrane filtration unit to intercept pollutants in the draw solution. The system has high recovery rate, good cleaning effect on the draw solution, low draw solution solute loss rate and small system load increase. The circulating drawing liquid can be kept in a good clean state, the burden of the drawing liquid recovery unit and the forward osmosis system in combined application is reduced, the risk of system pollution and blockage is reduced, the drawing liquid recovery utilization rate is improved, and the operation cost of the system is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a cleaning device for drawing a solution in a forward osmosis system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a liquid-drawing cleaning device according to an embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention will be given with reference to the accompanying drawings 1 and 2, and will make the functions and features of the present invention better understood.
Referring to fig. 2, a cleaning device for a forward osmosis system drawing liquid according to a first embodiment of the present invention includes: a drawing liquid cleaning device 1, wherein the drawing liquid cleaning device 1 comprises a water inlet tank 11, a booster pump 12, a safety filter 13, a high-pressure pump 14, a circulating pump 15, a membrane filtering unit 16, a water production tank 17 and a concentrated water tank 18; the booster pump 12 is mounted on a first pipe 191 between the inlet tank 11 and the input end of the cartridge filter 13; the output end of the cartridge filter 13 is connected with the rich water tank 18 through a second pipeline 192, and the high-pressure pump 14 is arranged on the second pipeline 192; the membrane filtration unit 16 comprises a membrane filtration input 161, a produced water output 162 and a concentrated water output 163; the circulating pump 15 is installed in a third pipeline 193, one end of the third pipeline 193 is communicated with the output end of the high-pressure pump 14 through a second pipeline 192, and the other end of the third pipeline 193 is connected with the membrane filtration input end 161; one end of a fourth pipeline 194 is connected with the produced water output end 162, and the other end of the fourth pipeline 194 is connected with the produced water tank 17; one end of a fifth pipe 195 is connected to the concentrate output terminal 163, and the other end of the fifth pipe 195 is connected to the second pipe 192 and is located between the connection part of the third pipe 193 and the second pipe 192 and the concentrate tank 18.
In this embodiment, the membrane filtration unit 16 employs an ultrafiltration membrane or a nanofiltration membrane to intercept contaminants and allow draw solution solvents and solutes to pass through.
Referring to fig. 1 and 2, a cleaning device for a forward osmosis system drawing liquid according to a second embodiment of the present invention has a structure substantially the same as that of the first embodiment, and the difference is: a forward osmosis membrane unit 2 comprises a raw water input end 21, a concentrated solution output end 22, a drawing liquid input end 23 and a drawing liquid output end 24; the drawing liquid output end 24 is connected with the water inlet tank 11 of the drawing liquid cleaning device 1; the raw water input 21 is connected to the concentrate tank 18 of the draw solution washing apparatus 1.
A draw liquid recovery unit 3 includes a weak draw liquid input 31, a strong draw liquid output 32 and a water production end 33, weak draw liquid input 31 connects the water production tank 17 of drawing liquid belt cleaning device 1, strong draw liquid output 32 connects the draw liquid input 23 of forward osmosis membrane unit 2.
The draw solution cleaning method is suitable for cleaning draw solution in a forward osmosis membrane concentration system coupled by a forward osmosis membrane unit 2 and a draw solution recovery unit 3.
The device also comprises a fifth pipeline 4 and a valve, wherein one end of the fifth pipeline 4 is connected with the drawing liquid output end, and the other end of the fifth pipeline 4 is connected with the drawing liquid recovery unit 3; the valve is mounted on the fifth pipe 4.
The drawing liquid cleaning device 1 adopts a forced circulation mode, the recovery rate can reach high, the concentrated water quantity is extremely small, the drawing liquid solute loss rate is low, and the system load is small.
The utility model discloses a belt cleaning device of positive osmotic system draw liquid draws liquid cleaning method and is: raw water enters the forward osmosis membrane unit 2 from the raw water input end 21, water molecules on the waste water side are drawn to the drawing liquid side through the driving force provided by the concentrated drawing liquid, so that concentrated liquid is formed and output from the concentrated liquid output end 22, and meanwhile, the concentrated drawing liquid is diluted into dilute drawing liquid and is output from the drawing liquid output end 24. The concentrated draw solution draws water molecules and also carries part of pollutants. At this time, the draw solution cleaning device 1 can be used for cleaning, the pollutants in the draw solution are intercepted in the concentrated water, the solute providing osmotic pressure in the draw solution permeates the cleaning membrane and permeates into the produced water, and the cleaning concentrated water enters the forward osmosis membrane unit 2 through the concentrated water tank 18 for retreatment. The diluted draw solution output from the draw solution output terminal 24 may completely or partially enter the draw solution cleaning apparatus 1 for cleaning. Under the condition that the drawing liquid is clean, the diluted drawing liquid can also surpass the drawing liquid cleaning device 1 through the fifth pipeline 4 and directly enter the drawing liquid recovery unit 3. The cleaned drawing liquid and/or the uncleaned drawing liquid becomes concentrated drawing liquid after being concentrated in the drawing liquid recovery unit 3, the concentrated drawing liquid enters the forward osmosis membrane unit 2 again from the concentrated drawing liquid output end 32 for recycling, and the produced water at the water production end 33 can be reused or discharged as clean water.
For the dip cleaning device 1, the dilute dip enters the water inlet tank 11 of the dip cleaning device 1, is pressurized by the booster pump 12, and enters the cartridge filter 13. The cartridge filter 13 is used for intercepting large-particle suspended matters and protecting the rear-end membrane filtration unit 16. The draw solution is circulated into the membrane filtration unit 16 by the circulation pump 15 after passing through the cartridge filter 13. The membrane filtration unit 16 can intercept the pollutants in the draw solution at the concentrated water side, so that the solute providing osmotic pressure in the draw solution permeates the cleaning membrane and permeates into the produced water. The produced water enters the water production tank 17 and is pumped into the drawing liquid recovery unit 3 for recycling. With the forced circulation of the drawing liquid, the water quantity is less and less, the water yield is more and more, finally, the concentrated solution containing a large amount of pollutants and trace drawing liquid solute is formed, enters the concentrated water tank 18 and is then pumped into the forward osmosis membrane unit 2.
In the present system, the types of the drawing liquid suitable for use include inorganic salts, organic salts and organic high molecular compounds. By adopting a forced circulation mode, the recovery rate can reach a high level, the concentrated water quantity is extremely low, the draw solution solute loss rate is low, and the system load is small.
In this example, sodium chloride, which is an inorganic salt, was used as the draw solution.
The drawing liquid composed of sodium chloride solution draws water molecules through the forward osmosis membrane unit 2 and simultaneously brings part of pollutants, and the diluted drawing liquid enters the water inlet tank 11 of the drawing liquid cleaning device 1.
The thin draw solution in the inlet tank 11 is pressurized by the booster pump 12 and enters the cartridge filter 13. The cartridge filter 13 functions to intercept large particle suspended matter and protect the back-end high-pressure pump 14 and the membrane filtration unit 16. The drawing liquid passes through a cartridge filter 13 and then enters a high-pressure pump 14, and the pressure is increased and then enters a circulation section.
The pumped liquid after the pressure is raised is circulated into the membrane filtration unit 16 by the circulation pump 15. In this embodiment, the membrane filtration unit 16 employs a nanofiltration membrane, which can intercept organic matters, divalent calcium magnesium salt and other pollutants in the draw solution at the concentrated water side, so that the sodium chloride solution penetrates through the nanofiltration membrane to become the product water, and then enters the product water tank 17. The nanofiltration concentrated water is circulated by the circulation pump 15 and enters the membrane filtration unit 16 again.
With the forced circulation of the drawing liquid, the water quantity on the nanofiltration concentrated water side is less and less, the water yield is more and more, and the concentrated solution containing a large amount of pollutants and trace sodium chloride solute is finally formed. When the nanofiltration system reaches the specified recovery rate, the concentrated solution is discharged to a concentrated water tank 18 and then is pumped into a raw water tank of the forward osmosis membrane unit 2 for treatment.
The present invention has been described in detail with reference to the embodiments shown in the drawings, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the invention, which are intended to be covered by the following claims.
Claims (5)
1. A cleaning apparatus for draw solution of a forward osmosis system, comprising: the device comprises a drawing liquid cleaning device, a water inlet tank, a booster pump, a safety filter, a high-pressure pump, a circulating pump, a membrane filtering unit, a water production tank and a concentrated water tank, wherein the drawing liquid cleaning device comprises the water inlet tank, the booster pump, the safety filter, the high-pressure pump, the circulating pump, the membrane filtering unit, the water production tank and the concentrated water tank; the booster pump is arranged on a first pipeline between the water inlet tank and the input end of the security filter; the output end of the cartridge filter is connected with the concentrated water tank through a second pipeline, and the high-pressure pump is installed on the second pipeline; the membrane filtration unit comprises a membrane filtration input end, a produced water output end and a concentrated water output end; the circulating pump is arranged on a third pipeline, one end of the third pipeline is communicated with the output end of the high-pressure pump through the second pipeline, and the other end of the third pipeline is connected with the membrane filtering input end; one end of a fourth pipeline is connected with the water production output end, and the other end of the fourth pipeline is connected with the water production tank; one end of a fifth pipeline is connected with the concentrated water output end, and the other end of the fifth pipeline is connected with the second pipeline and is positioned between the connecting part of the third pipeline and the second pipeline and the concentrated water tank.
2. The forward osmosis system draw solution cleaning device of claim 1, wherein the membrane filtration unit is an ultrafiltration membrane or a nanofiltration membrane.
3. The forward osmosis system draw solution cleaning device of claim 1, wherein a forward osmosis membrane unit comprises a raw water input, a concentrate output, a draw solution input, and a draw solution output; the drawing liquid output end is connected with the water inlet tank of the drawing liquid cleaning device; the raw water input end is connected with the concentrated water tank of the drawing liquid cleaning device.
4. The forward osmosis system draw solution cleaning device of claim 3, wherein a draw solution recovery unit comprises a dilute draw solution input and a concentrated draw solution output, the dilute draw solution input is connected to the water production tank of the draw solution cleaning device, and the concentrated draw solution output is connected to the draw solution input of the forward osmosis membrane unit.
5. The forward osmosis system drawing liquid cleaning device according to claim 4, further comprising a fifth pipeline and a valve, wherein one end of the fifth pipeline is connected to the drawing liquid output end, and the other end of the fifth pipeline is connected to the drawing liquid recovery unit; the valve is mounted on the fifth pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021081496.7U CN212576016U (en) | 2020-06-12 | 2020-06-12 | Cleaning device for liquid drawn by forward osmosis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021081496.7U CN212576016U (en) | 2020-06-12 | 2020-06-12 | Cleaning device for liquid drawn by forward osmosis system |
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| CN212576016U true CN212576016U (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021081496.7U Active CN212576016U (en) | 2020-06-12 | 2020-06-12 | Cleaning device for liquid drawn by forward osmosis system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892222A (en) * | 2021-04-23 | 2021-06-04 | 山东建筑大学 | System and process for cleaning micro-polluted nanofiltration membrane on line by adopting forward osmosis technology |
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2020
- 2020-06-12 CN CN202021081496.7U patent/CN212576016U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892222A (en) * | 2021-04-23 | 2021-06-04 | 山东建筑大学 | System and process for cleaning micro-polluted nanofiltration membrane on line by adopting forward osmosis technology |
| CN112892222B (en) * | 2021-04-23 | 2022-12-06 | 山东建筑大学 | System and process for cleaning micro-polluted nanofiltration membrane on line by adopting forward osmosis technology |
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