CN110975633A - Osmotic membrane cleaning system based on osmotic pressure difference - Google Patents
Osmotic membrane cleaning system based on osmotic pressure difference Download PDFInfo
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- CN110975633A CN110975633A CN201911334111.5A CN201911334111A CN110975633A CN 110975633 A CN110975633 A CN 110975633A CN 201911334111 A CN201911334111 A CN 201911334111A CN 110975633 A CN110975633 A CN 110975633A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/06—Use of osmotic pressure, e.g. direct osmosis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the field of reverse osmosis membrane cleaning, in particular to a permeable membrane cleaning system based on osmotic pressure difference, which comprises a membrane component, a first circulating pump and a second circulating pump, wherein a fresh chamber and a thick chamber are arranged inside the membrane component, a reverse osmosis membrane selection layer between the fresh chamber and the thick chamber faces the thick chamber, a fresh chamber water inlet and a fresh chamber water outlet are respectively arranged at two ends of the fresh chamber, the first circulating pump is arranged on a pipeline connected with the fresh chamber water inlet, a thick chamber water inlet and a thick chamber water outlet are respectively arranged at two ends of the thick chamber, and the second circulating pump is arranged on a pipeline connected with the thick chamber water inlet. The invention introduces solutions with different concentrations into the concentration chamber and the dilution chamber, and utilizes osmotic pressure difference to physically clean the reverse osmosis membrane, thereby having the advantages of low cost treatment and environmental protection.
Description
Technical Field
The invention relates to the field of reverse osmosis membrane cleaning, in particular to a permeable membrane cleaning system based on osmotic pressure difference.
Background
Currently, in the process of seawater desalination, the Reverse Osmosis (RO) membrane for treating ultrafiltration produced water is the most effective way for increasing water supply at present. The RO technology mainly faces the problems of organic fouling and salt scaling in the process of seawater desalination. The water produced by ultrafiltration contains a certain amount of organic matters, particularly acidic polysaccharide matters, which are adsorbed on the surface of a reverse osmosis membrane, and gel is formed in the presence of divalent cations. Although much research is currently being conducted on reducing fouling, such as pretreatment of reverse osmosis membrane feed water to reduce fouling, fouling of the surface is unavoidable.
In recent years, chemical cleaning, which involves physical and chemical interactions, is the main method used to remove the fouling layer from the membrane surface, and the chemical reactivity of the cleaning agent with the fouling layer determines the effectiveness of the cleaning agent. The cleaning agent can eliminate or obviously reduce the adhesion of dirt, and the dirt and the membrane surface pollutant can be separated only when the cleaning agent and the dirt undergo chemical reaction to weaken the interaction between the dirt. The currently selected cleaning agent mainly comprises acid, alkali, a metal chelating agent, a surfactant, enzyme, a metal chelating agent (such as EDTA), an anionic surfactant (such as SDS) and the like, and the cleaning agent can effectively clean the RO membrane polluted by organic matters. However, the use of detergents has many problems such as adverse effects on the environment if discharged directly into the environment, and the use of enzymatic detergents for cleaning organically polluted reverse osmosis membranes, particularly membranes polluted with proteins, although not adversely affecting the environment, but at high enzyme costs, which limits their large-scale use. Therefore, how to develop an environment-friendly and economical reverse osmosis membrane cleaning mode is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a permeable membrane cleaning system based on osmotic pressure difference, which has the advantages of low cost treatment and environmental friendliness by introducing solutions with different concentrations into a thick chamber and a thin chamber and utilizing the osmotic pressure difference to physically clean a reverse osmosis membrane.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a osmotic membrane cleaning system based on osmotic pressure difference, includes membrane module, first circulating pump and second circulating pump, inside room, dense room and the reverse osmosis membrane of fading of being equipped with of membrane module, just reverse osmosis membrane selective layer orientation between room and the dense room of fading, the room both ends of fading are equipped with respectively and fade the room water inlet and fade the room delivery port of fading, and are equipped with first circulating pump on the pipeline of being connected with the room water inlet of fading, dense room both ends are equipped with dense room water inlet and dense room delivery port respectively, and are equipped with the second circulating pump on the pipeline of being connected with the dense room water inlet.
The conductivity of the solution in the dense chamber is at least 2ms/cm higher than that of the solution in the weak chamber.
The flow rates of the dilute chamber and the concentrated chamber are controlled to be 2 cm-2 m/s.
The concentrate/fresh water combination includes deionized water/seawater (DI/SW), deionized water/reverse osmosis concentrate (DI/CW), seawater/reverse osmosis concentrate (SW/CW).
The membrane module is a plate frame chamber membrane module.
The membrane module is a spiral wound membrane module.
The concentrated chamber water inlet of the roll type membrane component is connected with an input pipeline, a first electromagnetic valve, a first circulating pump, a filter, a second electromagnetic valve and a high-speed pump are sequentially arranged on the input pipeline, the second electromagnetic valve and the high-speed pump are connected with a branch pipeline in parallel, a third electromagnetic valve is arranged on the branch pipeline, the concentrated chamber water outlet of the roll type membrane component is connected with an output pipeline, the fresh chamber water inlet of the roll type membrane component is connected with two pipelines, a fifth electromagnetic valve is arranged on the first pipeline, a second circulating pump and a sixth electromagnetic valve are sequentially arranged on the second pipeline, the fresh chamber water outlet of the roll type membrane component is connected with a third pipeline, and a fourth electromagnetic valve is arranged on the third pipeline.
When water was produced to normal reverse osmosis, the input of input pipeline is connected with the former cask, the output and the dense cask of reverse osmosis of output pipeline are connected, first pipeline, second pipeline and third pipeline all produce the cask with reverse osmosis and be connected, and first solenoid valve, second solenoid valve, fourth solenoid valve, fifth solenoid valve open, and third solenoid valve, sixth solenoid valve close, and first circulating pump and high-speed pump are opened, and the second circulating pump is closed.
During cleaning, the input end of the input pipeline is connected with a thick water barrel, the first pipeline, the second pipeline and the third pipeline are connected with a fresh water barrel, the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the sixth electromagnetic valve are opened, the second electromagnetic valve and the fifth electromagnetic valve are closed, the first circulating pump and the second circulating pump are opened, and the high-speed pump is closed.
The invention has the advantages and positive effects that:
1. the invention introduces solutions with different concentrations into the concentration chamber and the dilution chamber, and utilizes osmotic pressure difference to physically clean the reverse osmosis membrane, thereby having the advantages of low cost treatment and environmental protection.
2. The invention can be suitable for both plate-frame type membrane assemblies and roll-type membrane assemblies, can be matched with a reverse osmosis water production system when being applied to the roll-type membrane assemblies, can quickly switch between a normal reverse osmosis water production state and a cleaning state, and is flexible and convenient to use.
Drawings
Figure 1 is a schematic structural view of the present invention,
FIG. 2 is a schematic view of a rich chamber and a weak chamber inside a plate-and-frame membrane module,
FIG. 3 is a schematic diagram of a rich chamber and a weak chamber inside a rolled membrane module,
fig. 4 is a graph comparing the effects of different cleaning modes.
Wherein, 1 is a fresh water inlet, 2 is a fresh water outlet, 3 is a dense water inlet, 4 is a dense water outlet, 5 is a fourth electromagnetic valve, 6 is a second electromagnetic valve, 7 is a third electromagnetic valve, 8 is a first electromagnetic valve, 9 is a fifth electromagnetic valve, 10 is a sixth electromagnetic valve, 11 is a filter, 12 is a first circulating pump, 13 is a high-speed pump, 14 is a second circulating pump, 15 is a raw water barrel, 16 is a reverse osmosis water production barrel, 17 is a reverse osmosis water production barrel, 18 is a fresh water chamber, 19 is a dense chamber, 20 is a central tube, 21 is a second pipeline, 22 is a first pipeline, and 23 is a third pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, the membrane module comprises a membrane module, a first circulation pump 12 and a second circulation pump 14, wherein a fresh chamber 18 and a thick chamber 19 are arranged inside the membrane module, the fresh chamber 18 and the thick chamber 19 are separated by a reverse osmosis membrane, a selection layer of the reverse osmosis membrane faces the thick chamber 19, a fresh chamber water inlet 1 and a fresh chamber water outlet 2 are respectively arranged at two ends of the fresh chamber 18, the first circulation pump 12 is arranged on a pipeline connected with the fresh chamber water inlet 1, fresh water is pumped into the fresh chamber 18 through the action of the first circulation pump 12, a thick chamber water inlet 3 and a thick chamber water outlet 4 are respectively arranged at two ends of the thick chamber 19, the second circulation pump 14 is arranged on a pipeline connected with the thick chamber water inlet 3, and the thick water enters the thick chamber 19 through the action of the second circulation pump 14. According to the invention, solutions with different concentrations are injected into two sides of the reverse osmosis membrane to form osmotic pressure difference, inorganic salt and organic dirt on the surface of the reverse osmosis membrane are cleaned by utilizing the osmotic pressure difference, water in the fresh chamber 18 enters the thick chamber 19 through the reverse osmosis membrane under the action of osmotic pressure to realize the purposes of flushing and dissolving the pollutants and inorganic salt on the surface of the membrane, and the flux of the membrane is recovered, so that the cleaning effect of the pollutants is realized.
The conductivity of the solution in the thick chamber 19 is at least 2ms/cm higher than that in the thin chamber 18.
The flow rates of the dilute chamber 18 and the thick chamber 19 are controlled to be 2 cm-2 m/s through respective corresponding circulating pumps.
The concentrate/fresh water combination includes deionized water/seawater (DI/SW), deionized water/reverse osmosis concentrate (DI/CW), seawater/reverse osmosis concentrate (SW/CW), and the like. The effect of various concentrated water/fresh water combined cleaning effects is compared with the cleaning method in the prior art, for example, as shown in fig. 4, the cleaning method of the invention is superior to citric acid cleaning, and has little difference with the cleaning effect of chemicals, but the invention adopts osmotic pressure difference to carry out physical cleaning, is economically acceptable and does not affect the environment.
The membrane module can be a plate-frame membrane module and a spiral-wound membrane module.
Example 1
In this embodiment, the membrane module is a plate-frame chamber membrane module, an internal structure of the plate-frame chamber membrane module is shown in fig. 2, fresh water flows into the dilute chamber 8 from the dilute chamber water inlet 1 under the action of the corresponding circulating pump and flows out from the dilute chamber water outlet 2, and concentrated water flows into the concentrated chamber 19 from the concentrated chamber water inlet 3 under the action of the corresponding circulating pump and flows out from the concentrated chamber water outlet 4.
Example 2
In the embodiment, the membrane module is a spiral wound membrane module, the structure of the spiral wound membrane module is shown in FIG. 3, the fresh chamber 18 and the concentration chamber 19 in the spiral wound membrane module are in a flow channel shape, the specific structure of the spiral wound membrane module is that a reverse osmosis membrane, the fresh chamber 18, the reverse osmosis membrane, the concentration chamber 19 and the reverse osmosis membrane are sequentially arranged from inside to outside, a central pipe 20 is arranged in the fresh chamber 18 of the spiral wound membrane module, and as shown in fig. 1, the central tube 20 forms a fresh water inlet 1 and a fresh water outlet 2 at both ends, as shown in fig. 3, the central tube 20 is provided with a plurality of through holes communicating with the fade chamber 18, fresh water firstly flows in through the fade chamber water inlet 1 at the end of the central tube 20, then enters the fade chamber 18 through the plurality of through holes on the central tube 20, and when flowing out, firstly enters the central tube 20 and then flows out through the fade chamber water outlet 2, as shown in figure 1, both ends of the outer side of the roll-type membrane component are respectively provided with a dense chamber water inlet 3 and a dense chamber water outlet 4. The internal structure of the roll-up membrane module is known in the art.
As shown in fig. 1, the roll-type membrane module can be connected with a reverse osmosis water production system, so that a reverse osmosis water production process can be realized, and the purpose of cleaning a reverse osmosis membrane by utilizing the osmotic pressure difference formed by the solutions with different concentrations can also be realized.
As shown in fig. 1, a dense chamber water inlet 3 of the roll-type membrane module is connected with an input pipeline, the input pipeline is sequentially provided with a first electromagnetic valve 8, a first circulating pump 12, a filter 11, a second electromagnetic valve 6 and a high-speed pump 13, the second electromagnetic valve 6 and the high-speed pump 13 are connected in parallel with a branch pipeline, the branch pipeline is provided with a third electromagnetic valve 7, a dense chamber water outlet 4 of the roll-type membrane module is connected with an output pipeline, a dilute chamber water inlet 1 of the roll-type membrane module is simultaneously connected with two pipelines, a fifth electromagnetic valve 9 is arranged on a first pipeline 22, a second circulating pump 14 and a sixth electromagnetic valve 10 are sequentially arranged on a second pipeline 21, a dilute chamber water outlet 2 of the roll-type membrane module is connected with a third pipeline 23, and a fourth electromagnetic valve 5 is arranged on the third pipeline 23. The electromagnetic valve, the filter 11, the circulating pump and the high-speed pump are all known in the art.
When water is produced by reverse osmosis normally, as shown in fig. 1, the input end of the input pipeline is connected with the raw water barrel 15, the output end of the output pipeline is connected with the reverse osmosis concentrated water barrel 17, the first pipeline 22, the second pipeline 21 and the third pipeline 23 are all connected with the reverse osmosis water producing barrel 16, at the moment, the first electromagnetic valve 8, the second electromagnetic valve 6, the fourth electromagnetic valve 5 and the fifth electromagnetic valve 9 are controlled by the system to be opened, the third electromagnetic valve 7 and the sixth electromagnetic valve 10 are closed, the first circulating pump 12 and the high-speed pump 13 are opened, and the second circulating pump 14 is closed. Water (usually seawater) in a raw water barrel 15 enters the spiral-wound membrane module through a thick chamber water inlet 3 under the action of a circulating pump 12 and a high-speed pump 13, the water is subjected to huge pressure and is filtered by a reverse osmosis membrane, then enters a thin chamber 18 on the inner side from a thick chamber 19 on the outer side, flows out from a thin chamber water inlet 1 and a thin chamber water outlet 2 on two sides and enters a reverse osmosis water production barrel 16, the thin chamber water inlet 1 and the thin chamber water outlet 2 are both used for outputting filtered reverse osmosis produced water (namely deionized water), and the residual reverse osmosis concentrated water in the thick chamber 19 flows into a reverse osmosis concentrated water barrel 17 through an output pipeline, so that the reverse osmosis water production process is realized.
When cleaning is carried out, as shown in fig. 1, the input end of the input pipeline is connected with a concentrated water barrel (which can be directly a raw water barrel 15), the first pipeline 22, the second pipeline 21 and the third pipeline 23 are connected with a fresh water barrel (which can be directly a reverse osmosis water barrel 16), at this time, the system controls the first electromagnetic valve 8, the third electromagnetic valve 7, the fourth electromagnetic valve 5 and the sixth electromagnetic valve 10 to be opened, the second electromagnetic valve 6 and the fifth electromagnetic valve 9 to be closed, the first circulating pump 12 and the second circulating pump 14 to be opened, and the high-speed pump 13 to be closed, at this time, the system is the cleaning system for cleaning the reverse osmosis membrane by using osmotic pressure difference, wherein the first circulating pump 12 enables the concentrated water to enter a concentrated chamber 19 on the outer side of the rolled membrane module through a concentrated chamber water inlet 3 and to flow out through a concentrated chamber water outlet 4, the second circulating pump 14 enables the fresh water to enter a fresh chamber 18 on the inner, and flows out through the water outlet 2 of the fresh water chamber.
Claims (9)
1. A osmotic membrane cleaning system based on osmotic pressure difference is characterized in that: including membrane module, first circulating pump (12) and second circulating pump (14), inside room (18), dense room (19) and the reverse osmosis membrane of fading of being equipped with of membrane module, just the reverse osmosis membrane between room (18) and the dense room (19) selects layer orientation dense room (19), fade room (18) both ends and be equipped with respectively and fade room water inlet (1) and fade room delivery port (2), and be equipped with first circulating pump (12) on the pipeline of being connected with fade room water inlet (1), dense room (19) both ends are equipped with dense room water inlet (3) and dense room delivery port (4) respectively, and are equipped with second circulating pump (14) on the pipeline of being connected with dense room water inlet (3).
2. The osmotic pressure differential-based membrane cleaning system according to claim 1, wherein: the conductivity of the solution in the thick chamber (19) is at least 2ms/cm higher than that of the solution in the thin chamber (18).
3. The osmotic pressure differential-based membrane cleaning system according to claim 1, wherein: the flow rates of the dilute chamber (18) and the concentrated chamber (19) are controlled to be 2 cm-2 m/s.
4. The osmotic pressure differential-based membrane cleaning system according to claim 1, wherein: the concentrate/fresh water combination includes deionized water/seawater (DI/SW), deionized water/reverse osmosis concentrate (DI/CW), seawater/reverse osmosis concentrate (SW/CW).
5. The osmotic pressure differential-based membrane cleaning system according to claim 1, wherein: the membrane module is a plate frame chamber membrane module.
6. The osmotic pressure differential-based membrane cleaning system according to claim 1, wherein: the membrane module is a spiral wound membrane module.
7. The osmotic pressure differential-based membrane cleaning system according to claim 6, wherein: a water inlet (3) of a dense chamber of the roll-type membrane component is connected with an input pipeline, and the input pipeline is sequentially provided with a first electromagnetic valve (8), a first circulating pump (12), a filter (11), a second electromagnetic valve (6) and a high-speed pump (13), the second electromagnetic valve (6) and the high-speed pump (13) are connected in parallel with a branch, a third electromagnetic valve (7) is arranged on the branch, the dense chamber water outlet (4) of the roll-type membrane component is connected with an output pipeline, the fresh chamber water inlet (1) of the roll-type membrane component is connected with two pipelines, wherein the first pipeline (22) is provided with a fifth electromagnetic valve (9), the second pipeline (21) is sequentially provided with a second circulating pump (14) and a sixth electromagnetic valve (10), a fresh water outlet (2) of the spiral-wound membrane module is connected with a third pipeline (23), and a fourth electromagnetic valve (5) is arranged on the third pipeline (23).
8. The osmotic pressure differential-based membrane cleaning system according to claim 7, wherein: when normal reverse osmosis produced water, the input of input pipeline was connected with former cask (15), output pipeline's output is connected with reverse osmosis thick water bucket (17), first pipeline (22), second pipeline (21) and third pipeline (23) all are connected with reverse osmosis product bucket (16), and first solenoid valve (8), second solenoid valve (6), fourth solenoid valve (5), fifth solenoid valve (9) are opened, and third solenoid valve (7), sixth solenoid valve (10) are closed, and first circulating pump (12) and high-speed pump (13) are opened, and second circulating pump (14) are closed.
9. The osmotic pressure differential-based membrane cleaning system according to claim 7, wherein: during cleaning, the input end of the input pipeline is connected with a thick water barrel, the first pipeline (22), the second pipeline (21) and the third pipeline (23) are connected with a fresh water barrel, the first electromagnetic valve (8), the third electromagnetic valve (7), the fourth electromagnetic valve (5) and the sixth electromagnetic valve (10) are opened, the second electromagnetic valve (6) and the fifth electromagnetic valve (9) are closed, the first circulating pump (12) and the second circulating pump (14) are opened, and the high-speed pump (13) is closed.
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| CN201911334111.5A CN110975633B (en) | 2019-12-23 | 2019-12-23 | Osmotic membrane cleaning system based on osmotic pressure difference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112473374A (en) * | 2020-11-06 | 2021-03-12 | 张梅 | Semipermeable membrane desalination device and method with bidirectional forward osmosis online cleaning function |
| CN113797760A (en) * | 2021-09-06 | 2021-12-17 | 上海开能新技术工程有限公司 | Chemical cleaning device and cleaning method for reverse osmosis membrane |
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| EP0768112A1 (en) * | 1995-10-16 | 1997-04-16 | Christ AG | Process and device for producing pure water |
| CN105903355A (en) * | 2016-06-06 | 2016-08-31 | 上海知勉环境技术有限公司 | Method for preventing and treating pollution through reverse osmosis membrane or nano filter membrane system |
| CN107321186A (en) * | 2017-08-16 | 2017-11-07 | 北京北控海创科技有限公司 | A kind of nanofiltration, the online reverse cleaning method and device of hyperosmosis of reverse osmosis membrane |
| CN108722195A (en) * | 2018-06-05 | 2018-11-02 | 北京海川新源环保科技有限公司 | A kind of the explosive filling free on-line cleaning method and device of counter-infiltration system |
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2019
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| EP0768112A1 (en) * | 1995-10-16 | 1997-04-16 | Christ AG | Process and device for producing pure water |
| CN105903355A (en) * | 2016-06-06 | 2016-08-31 | 上海知勉环境技术有限公司 | Method for preventing and treating pollution through reverse osmosis membrane or nano filter membrane system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112473374A (en) * | 2020-11-06 | 2021-03-12 | 张梅 | Semipermeable membrane desalination device and method with bidirectional forward osmosis online cleaning function |
| CN113797760A (en) * | 2021-09-06 | 2021-12-17 | 上海开能新技术工程有限公司 | Chemical cleaning device and cleaning method for reverse osmosis membrane |
| CN113797760B (en) * | 2021-09-06 | 2024-02-09 | 上海开能新技术工程有限公司 | Chemical cleaning device and cleaning method for reverse osmosis membrane |
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