CN104607051A - Filtering membrane cleaning method - Google Patents
Filtering membrane cleaning method Download PDFInfo
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- CN104607051A CN104607051A CN201510020021.4A CN201510020021A CN104607051A CN 104607051 A CN104607051 A CN 104607051A CN 201510020021 A CN201510020021 A CN 201510020021A CN 104607051 A CN104607051 A CN 104607051A
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- discharge
- filter membrane
- electrode
- outlet pipe
- clean container
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Abstract
The invention discloses a filtering membrane cleaning method. The filtering membrane cleaning method is characterized in that a to-be-cleaned filtering membrane is placed in a liquid phase and subjected to liquid phase discharge through electrodes of a high-voltage pulsed power supply, so that corona discharge, glow discharge or streamer discharge occurs in the liquid phase; under the physical and chemical effect produced in the discharge process, substances blocking membrane holes are separated from the membrane holes, and the filtering membrane is cleaned. The filtering membrane can be efficiently cleaned, and membrane flux is rapidly recovered to realize membrane regeneration. The filtering membrane cleaning method has the advantages of short cleaning period, low cost and good effect.
Description
Technical field
The present invention relates to technical field of membrane separation; Particularly relate to a kind of filter membrane cleaning method being beneficial to high pressure pulse discharge effect process.
Background technology
UF membrane occurs in 20 beginnings of the century, the separation technology emerged rapidly after the sixties in 20th century.Adopt and there is the filter membrane of Selective Separation function, utilize that the Selective Separation of film realizes the separation of the different component of feed liquid, purifying, concentrated process are called UF membrane.
membrane separation techniqueowing to having separation, concentrated, purifying and refining function concurrently, have again efficient, energy-saving and environmental protection, molecule level is filtered and filter process is simple, be easy to the features such as control, therefore, be widely used at present food, medicine, biology, environmental protection,
chemical industry,
metallurgical, the energy, oil, water treatment, electronics,
bionicalin field, create huge economic benefit and social benefit, become current
separation sciencein one of most important means.
High temperature resistant, mechanical strength is large, Stability Analysis of Structures, pore-size distribution are narrow, chemical stability good owing to having for filter membrane, not easily by features such as microbial attacks, be applied in recent years in increasing field.Whether success or not and the performance of film own of these application are stablized, pollute after can regenerate and have close relationship.Traditional Membrane cleaning technology has not reached the demand of film now.Therefore determine that effective and stable cleaning method is quite important for the industrial applications of membrane separation technique.
It is one of main problem of being restricted of membrane technology extensive use that permeation flux that concentration polarization and fouling membrane cause declines.Fouling membrane can be divided into three parts by its degree: surface deposition, fenestra internal congestion, film surface and hole in absorption.The method of traditional Membrane cleaning can be divided into physical method and chemical method at present.Physical method comprises: increase film surface less turbulence, gas, Liquid backwash, ultrasonic cleaning, sponge balls washing; Chemical method comprises: acid, alkali cleaning, and surfactant, chelating agent clean, oxidant and enzyme cleaning.Selected according to membrane material, pollutant and pollution level are different.So far, simple above two kinds of methods all exist cleaning performance undesirable or cleaning high cost cause cannot being applied in real work, there is secondary pollution problems in addition.
Therefore for those skilled in the art, be necessary that research and development one can realize high-efficiency washing to filter membrane, Quick-return membrane flux reaches film regeneration, and the cleaning frequency is short, and cost is low, effective filter membrane cleaning method.
Summary of the invention
For above-mentioned the deficiencies in the prior art, technical problem to be solved by this invention is: how to provide one can realize high-efficiency washing to filter membrane, and Quick-return membrane flux reaches film regeneration, and the cleaning frequency is short, and cost is low, effective filter membrane cleaning method.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
A kind of filter membrane cleaning method, is characterized in that, filter membrane to be cleaned is placed in liquid phase, then adopts high-voltage pulse power source to carry out discharge in water by electrode pair filter membrane to be cleaned, makes corona discharge, glow discharge or streamer-discahrge occur in the liquid phase; Under the physical chemistry effect produced in exoelectrical reaction process, the material blocking fenestra departs from from fenestra, realizes cleaning.
Produced chemical effect and the physical effect of plasma in the present invention by high pressure pulse discharge, high strength, omnibearing cleaning are carried out to film.Specifically, its principle is for effectively setting up liquid phase plasma by use short pulse discharge type (preferably adopt voltage to be 10 ~ 30KV, power pulse frequency is the high pressure-burst pulse of 50 ~ 100Hz).Along with the development of power technology, the pulse that the short voltage rising time that high-voltage pulse discharge in water is used is less than 100ns, narrow pulse width is less than a few microsecond is achieved, and therefore between electrode, forms instantaneous high-strength electric field.This instantaneous high-strength electric field can accelerate electronics when not speeding-up ion, thus forms high energy and can change electronics, the atom around electronic impact and molecule, forms plasma channel.Also along with physics and chemistry effect while this process of generation, physical effect is except highfield, can also form ultraviolet light, shock wave, ultrasonic cavitation.Chemical effect is mainly and produces various active material, as OH, O, HO of instantaneous existence
2the H longer with life period
2o
2and O
3deng material.That is, discharge in water can produce highfield, strong oxidizing property free radical, ultraviolet light and shock wave four kinds of action effects simultaneously.
Such filter membrane is under the effect of shock wave and ultrasonic wave (ultrasonic hole), and the material of the attachment in fenestra starts to come off and diffuses in cleaning fluid, and membrane flux recovers gradually.In addition, the formation of ultraviolet light is the important physical features of pulse liquid phase discharge, ultraviolet has very strong luminous energy, the organic chemical bond being attached to film surface can be made fracture to occur and decompose, and ultraviolet has very strong penetration capacity, membrane-permeable top layer also deeply reaches several microns thus generation effect.After ultra-violet radiation is absorbed by bulk solution, make the organic matter that dissolved oxygen generation excited oxygen atom is degraded in contaminated film.In addition, carry out high pressure pulse discharge in the liquid phase and can produce OH, O, HO
2and H
2o
2and O
3oxidizing species, is oxidized the organic matter diffused in film water, thus reaches the object recovering membrane flux.
In the present invention, film to be cleaned is inoranic membrane or other high temperature oxidation resisting class films.Because organic film may damage because of discharge process.
As optimization, the present invention can specifically comprise the following steps:
A, first obtain the cleaning device of following structure, described cleaning device comprises a clean container, clean container upper end open the container cover with coupling can realize sealing, the connection of side, clean container upper end is provided with water inlet pipe, metal net shaped earth electrode is horizontally disposed with in the middle part of clean container inner chamber, earth electrode one end connects clean container and ground connection by an earth connection, clean container is also communicated with away from the bottom of water inlet pipe side and is provided with outlet pipe, in the middle part of described earth electrode, top position is vertical just to being provided with needle electrode, needle electrode upper end is fixed and is connected with high-voltage pulse power source by power switch after passing container cover,
When b, cleaning, first open clean container, filter membrane to be cleaned is paved on earth electrode, close outlet pipe and open water inlet pipe and put into rinse water and carry out retaining, when water flooding filter membrane and after exceeding needle electrode lower end position, open the flowing that outlet pipe realizes rinse water, ensure that discharge process middle water level is higher than needle electrode lower end simultaneously;
C, then power-on switch, high-voltage pulse power source is utilized to power, and make to form corona discharge, glow discharge or streamer-discahrge in the liquid phase between needle electrode and earth electrode, under the physical chemistry effect produced in exoelectrical reaction process, block the material of fenestra to enter in rinse water and to flow out from outlet pipe with current, complete cleaning.
After such optimization, have employed simple cleaning device, shirtsleeve operation step, achieve above-mentioned cleaning process, the unique texture of cleaning device can be beneficial to the generation of electric discharge phenomena more.Simultaneously during discharge cleaning, filter membrane is in the cleaning fluid of flowing, and the tamper that can depart from being hit better downstream stream is taken out of, improves cleaning efficiency.
As further optimization, described outlet pipe comprises the first outlet pipe be disposed adjacent above earth electrode and the second outlet pipe being positioned at clean container bottom position.After such optimization, be provided with two outlet pipes, because in filter membrane Discharge Cleaning process, part film hole plug thing can be gone out by the direction of the percussion of electric discharge phenomena above filter membrane, like this under the guiding function of the first outlet pipe water outlet, this part Pore Blocking thing can flow out from the first outlet pipe, avoids it again to cause secondary to block by filter membrane, so just greatly ensure that cleaning performance.In addition, the setting of two outlet pipes, detects the pressure reduction of the first outlet pipe and the second outlet pipe rapidly after can conveniently cleaning, obtain the relevant parameter of the permeability of membrane.
As further optimization, closing containers lid before electric discharge, makes clean container in discharge process be in air-tight state.The gaseous active compounds making full use of high pressure pulse discharge generation in cleaning process can be made like this as O
3deng, O
3etc. soluble in water and remove the pollutant that is attached on fenestra.In addition, the high-voltage pulse effect produced in the pulsed discharge of closed container mesohigh can make there is suitable pressure difference value by the positive and negative cleaning film, strengthens the removal to the pollutant be blocked in fenestra, thus can ensure discharge effect better.
As further optimization, high-voltage pulse power source voltage is 10 ~ 30KV, power pulse frequency is 50 ~ 100Hz, the rinse water electrical conductivity added is 10 ~ 80 μ S/cm, flow is 5 ~ 50L/min, distance between described needle electrode and earth electrode is 10 ~ 45mm, and the diameter of needle electrode is 1 ~ 50mm, and its lower end is most advanced and sophisticated.Like this, can ensure better can produce corona discharge, glow discharge or streamer-discahrge phenomenon between electrode, ensure cleaning performance.While it is noted that: destroy membrane structure to make plasma channel not reach earth electrode one end, discharge type not can be arc discharge.
As further optimization, earth electrode is set to the perforated metal net that aperture is 5 ~ 20 μm.The shock wave that produces because of high pressure pulse discharge effectively can be prevented so excessive and film is damaged.In addition, by comparing test needle electrode being positioned over film top and bottom, when finding needle electrode to be positioned over film upper end, membrane flux recovery rate is than the height of lower end, therefore needle electrode is positioned over film upper end.
The invention has the beneficial effects as follows as Membrane cleaning provides a kind of efficient, easy method.By parameters such as adjustment electrode spacing, pulse voltage and pulse frequency, electrode diameter and rinse water electrical conductivity, make the material being blocked in fenestra and film surface be removed or degrade, thus membrane flux is restored.
In sum, the present invention can realize high-efficiency washing to filter membrane, and Quick-return membrane flux reaches film regeneration, and have the cleaning frequency short, cost is low, effective advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation sketch of the cleaning device that the present invention adopts when specifically implementing.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment:
The filter membrane cleaning method of the present embodiment, specifically comprises the following steps:
A, first obtain the cleaning device of following structure, described cleaning device as shown in Figure 1, comprise a clean container, clean container upper end open the container cover with coupling can realize sealing, the connection of side, clean container upper end is provided with water inlet pipe 5, metal net shaped earth electrode 2 is horizontally disposed with in the middle part of clean container inner chamber, earth electrode 2 one end connects clean container and ground connection by an earth connection, clean container is also communicated with away from the bottom of water inlet pipe side and is provided with outlet pipe, in the middle part of described earth electrode 2, top position is vertical just to being provided with needle electrode 1, needle electrode 1 upper end is fixed and is connected with high-voltage pulse power source by power switch 3 after passing container cover,
When b, cleaning, first open clean container, filter membrane to be cleaned is paved on earth electrode, close outlet pipe and open water inlet pipe and put into rinse water and carry out retaining, when water flooding filter membrane and after exceeding needle electrode lower end position, open the flowing that outlet pipe realizes rinse water, ensure that discharge process middle water level is higher than needle electrode lower end simultaneously;
C, then power-on switch, high-voltage pulse power source is utilized to power, and make to form corona discharge, glow discharge or streamer-discahrge in the liquid phase between needle electrode and earth electrode, under the physical chemistry effect produced in exoelectrical reaction process, block the material of fenestra to enter in rinse water and to flow out from outlet pipe with current, complete cleaning.
In the present embodiment, described outlet pipe comprises the first outlet pipe be disposed adjacent above earth electrode and the second outlet pipe being positioned at clean container bottom position.Be provided with two outlet pipes like this, because in filter membrane Discharge Cleaning process, part film hole plug thing can be gone out by the direction of the percussion of electric discharge phenomena above filter membrane, like this under the guiding function of the first outlet pipe water outlet, this part Pore Blocking thing can flow out from the first outlet pipe, avoid it again to cause secondary to block by filter membrane, so just greatly ensure that cleaning performance.
In the present embodiment, closing containers lid before electric discharge, makes clean container in discharge process be in air-tight state.The gaseous active compounds making full use of high pressure pulse discharge generation in cleaning process can be made like this as O
3deng, O
3etc. soluble in water and remove the pollutant that is attached on fenestra.In addition, the high-voltage pulse effect produced in the pulsed discharge of closed container mesohigh can make there is suitable pressure difference value by the positive and negative cleaning film, strengthens the removal to the pollutant be blocked in fenestra, thus can ensure discharge effect better.
In the present embodiment, high-voltage pulse power source voltage is 10 ~ 30KV, power pulse frequency is 50 ~ 100Hz, the rinse water electrical conductivity added is 10 ~ 80 μ S/cm, flow is 5 ~ 50L/min, distance between described needle electrode and earth electrode is 10 ~ 45mm, and the diameter of needle electrode is 1 ~ 50mm, and its lower end is most advanced and sophisticated.Like this, can ensure better can produce corona discharge, glow discharge or streamer-discahrge phenomenon between electrode, ensure cleaning performance.While it is noted that: destroy membrane structure to make plasma channel not reach earth electrode one end, discharge type not can be arc discharge.
In the present embodiment, earth electrode is set to the perforated metal net that aperture is 5 ~ 20 μm.The shock wave that produces because of high pressure pulse discharge effectively can be prevented so excessive and film is damaged.In addition, by comparing test needle electrode being positioned over film top and bottom, when finding needle electrode to be positioned over film upper end, membrane flux recovery rate is than the height of lower end, therefore needle electrode is positioned over film upper end.
In the present embodiment, filter membrane to be cleaned is inorganic ceramic membrane, when being positioned on earth electrode by filter membrane, meets water flow path direction one side surface (i.e. contaminated one side) upward in filter membrane use procedure.In high pressure pulse discharge, the active material that electric discharge produces generates near needle electrode tip, by pollute face up can make to be blocked in pollutant in fenestra more effectively degrade by active material.In addition, the result in conditional FP tree process also shows, faces down relative to by pollution, and pollution being faced up in discharge process to obtain better cleaning performance.
In the present embodiment, needle electrode and earth electrode material therefor are 316 stainless steels.Like this, can ensure better can produce corona discharge, glow discharge or streamer-discahrge phenomenon between electrode.
When the present embodiment is implemented, observation can be seen, after turning on the power switch, needle electrode carries out positive polarity electric discharge, and many short streamer passages is formed, and in the streamer of formation, a little white portion surrounded by the thin layer of a magenta.A large amount of minute bubbles are formed at ate electrode.Observed by emission spectrum, in discharge process, produce hydroxyl radical free radical, hydroperoxyl radical and other active materials in a large number.About 10min is reacted in pulsed discharge, measures the pressure reduction of the first outlet pipe and the second outlet pipe in course of reaction, obtains the relevant parameter of the permeability of membrane, and the recovery rate of final membrane flux is about 95%.
Claims (6)
1. a filter membrane cleaning method, is characterized in that, filter membrane to be cleaned is placed in liquid phase, then adopts high-voltage pulse power source to carry out discharge in water by electrode pair filter membrane to be cleaned, makes corona discharge, glow discharge or streamer-discahrge occur in the liquid phase; Under the physical chemistry effect produced in exoelectrical reaction process, the material blocking fenestra departs from from fenestra, realizes cleaning.
2. filter membrane cleaning method as claimed in claim 1, is characterized in that, specifically comprise the following steps:
A, first obtain the cleaning device of following structure, described cleaning device comprises a clean container, clean container upper end open the container cover with coupling can realize sealing, the connection of side, clean container upper end is provided with water inlet pipe, metal net shaped earth electrode is horizontally disposed with in the middle part of clean container inner chamber, earth electrode one end connects clean container and ground connection by an earth connection, clean container is also communicated with away from the bottom of water inlet pipe side and is provided with outlet pipe, in the middle part of described earth electrode, top position is vertical just to being provided with needle electrode, needle electrode upper end is fixed and is connected with high-voltage pulse power source by power switch after passing container cover,
When b, cleaning, first open clean container, filter membrane to be cleaned is paved on earth electrode, close outlet pipe and open water inlet pipe and put into rinse water and carry out retaining, when water flooding filter membrane and after exceeding needle electrode lower end position, open the flowing that outlet pipe realizes rinse water, ensure that discharge process middle water level is higher than needle electrode lower end simultaneously;
C, then power-on switch, high-voltage pulse power source is utilized to power, and make to form corona discharge, glow discharge or streamer-discahrge in the liquid phase between needle electrode and earth electrode, under the physical chemistry effect produced in exoelectrical reaction process, block the material of fenestra to enter in rinse water and to flow out from outlet pipe with current, complete cleaning.
3. filter membrane cleaning method as claimed in claim 2, is characterized in that, described outlet pipe comprises the first outlet pipe be disposed adjacent above earth electrode and the second outlet pipe being positioned at clean container bottom position.
4. filter membrane cleaning method as claimed in claim 2, is characterized in that, closing containers lid before electric discharge, makes clean container in discharge process be in air-tight state.
5. filter membrane cleaning method as claimed in claim 2, it is characterized in that, high-voltage pulse power source voltage is 10 ~ 30KV, power pulse frequency is 50 ~ 100Hz, the rinse water electrical conductivity added is 10 ~ 80 μ S/cm, and flow is 5 ~ 50L/min, and the distance between described needle electrode and earth electrode is 10 ~ 45mm, the diameter of needle electrode is 1 ~ 50mm, and its lower end is most advanced and sophisticated.
6. filter membrane cleaning method as claimed in claim 2, it is characterized in that, earth electrode is set to the perforated metal net that aperture is 5 ~ 20 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510020021.4A CN104607051B (en) | 2015-01-15 | 2015-01-15 | A kind of filter membrane cleaning method |
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|---|---|---|---|
| CN201510020021.4A CN104607051B (en) | 2015-01-15 | 2015-01-15 | A kind of filter membrane cleaning method |
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| CN104607051A true CN104607051A (en) | 2015-05-13 |
| CN104607051B CN104607051B (en) | 2016-05-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151144A (en) * | 2020-01-07 | 2020-05-15 | 西安交通大学 | Nano porous membrane cleaning device and cleaning method based on insulation dielectrophoresis |
| CN113637720A (en) * | 2021-09-10 | 2021-11-12 | 山东广昊生物制品有限公司 | Preparation method of desalted cartilage oligopeptide powder |
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| CN102773020A (en) * | 2012-07-18 | 2012-11-14 | 北京理工大学 | Method for wholly chemically grafting membrane component by utilizing remote plasma |
| CN103249472A (en) * | 2010-12-10 | 2013-08-14 | 东丽株式会社 | Chemical cleaning method for immersed membrane element |
| CN103752176A (en) * | 2007-11-02 | 2014-04-30 | P2I有限公司 | Filtration membranes |
-
2015
- 2015-01-15 CN CN201510020021.4A patent/CN104607051B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0015428A1 (en) * | 1979-02-15 | 1980-09-17 | Eugene Farrell Hill | Process and apparatus for separating hydrogen from fluids |
| CN103752176A (en) * | 2007-11-02 | 2014-04-30 | P2I有限公司 | Filtration membranes |
| CN103249472A (en) * | 2010-12-10 | 2013-08-14 | 东丽株式会社 | Chemical cleaning method for immersed membrane element |
| CN102407077A (en) * | 2011-12-09 | 2012-04-11 | 佛山市新泰隆环保设备制造有限公司 | Regenerating method and device of abandoned reverse osmosis membrane element |
| CN102773020A (en) * | 2012-07-18 | 2012-11-14 | 北京理工大学 | Method for wholly chemically grafting membrane component by utilizing remote plasma |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151144A (en) * | 2020-01-07 | 2020-05-15 | 西安交通大学 | Nano porous membrane cleaning device and cleaning method based on insulation dielectrophoresis |
| CN113637720A (en) * | 2021-09-10 | 2021-11-12 | 山东广昊生物制品有限公司 | Preparation method of desalted cartilage oligopeptide powder |
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| Publication number | Publication date |
|---|---|
| CN104607051B (en) | 2016-05-25 |
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Effective date of registration: 20210222 Address after: 401329 no.27-5, Fengsheng Road, Jiulongpo District, Chongqing Patentee after: Chongqing Xinhe Qiyue Technology Co.,Ltd. Address before: 400044 No. 174 Sha Jie street, Shapingba District, Chongqing Patentee before: Chongqing University |