CN104607051B - A kind of filter membrane cleaning method - Google Patents
A kind of filter membrane cleaning method Download PDFInfo
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- CN104607051B CN104607051B CN201510020021.4A CN201510020021A CN104607051B CN 104607051 B CN104607051 B CN 104607051B CN 201510020021 A CN201510020021 A CN 201510020021A CN 104607051 B CN104607051 B CN 104607051B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 55
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Abstract
The invention discloses a kind of filter membrane cleaning method, it is characterized in that, filter membrane to be cleaned is placed in to liquid phase, then adopts high-voltage pulse power source to carry out discharge in water by electrode pair filter membrane to be cleaned, make to occur corona discharge, glow discharge or streamer-discahrge in liquid phase; Under the physical chemistry effect producing in exoelectrical reaction process, the material that blocks fenestra departs from from fenestra, realizes and cleaning. The present invention can realize high-efficiency washing to filter membrane, and Quick-return membrane flux reaches film regeneration, has the cleaning frequency short, and cost is low, effective advantage.
Description
Technical field
The present invention relates to membrane separation technique field; Particularly relate to a kind of filter membrane cleaning method that utilizes high pressure pulse discharge effect processing.
Background technology
It is to occur in 20 beginnings of the century that film separates, the separation technology emerging rapidly after the sixties in 20th century. Employing has the filter membrane of Selective Separation function, and separation, purifying, the concentrated process of utilizing the Selective Separation of film to realize the different component of feed liquid is called film and separates. Membrane separation technique is owing to having separation, concentrated, purifying and refining function concurrently, have again efficient, energy-saving and environmental protection, molecular level filters and filter process is simple, be easy to the features such as control, therefore, food, medicine, biology, environmental protection, chemical industry, metallurgy, the energy, oil, water treatment, electronics, the field such as bionical are widely used at present, produce huge economic benefit and social benefit, become one of most important means in current separation science.
Filter membrane is high temperature resistant owing to having, mechanical strength is large, Stability Analysis of Structures, pore-size distribution is narrow, chemical stability good, be difficult for by features such as microbial attacks, is applied in recent years in increasing field. Can whether the own performance of the success or not of these application and film regenerate and have close relationship after stablizing, polluting. Traditional film cleaning technique 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 concentration polarization and film pollute that the permeation flux that causes declines. Film pollutes can be divided into three parts by its degree: surface deposition, fenestra internal congestion, the absorption in film surface and hole. The method that traditional film cleans can be divided into physical method and chemical method at present. Physical method comprises: increase film surface less turbulence, gas, liquid recoil, ultrasonic cleaning, sponge balls washing; Chemical method comprises: acid, alkali clean, and surfactant, chelating agent clean, and oxidant and enzyme clean. 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 clean high cost cause being applied in real work, existed in addition secondary pollution problems.
Therefore for those skilled in the art, be necessary to research and develop one and can realize high-efficiency washing to filter membrane, fast quick-recovery 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 to realize high-efficiency washing to filter membrane, fast quick-recovery 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, the present invention has adopted following technical scheme:
A kind of filter membrane cleaning method, is characterized in that, filter membrane to be cleaned is placed in to liquid phase, then adopts high-voltage pulse power source to carry out discharge in water by electrode pair filter membrane to be cleaned, makes to occur corona discharge, glow discharge or streamer-discahrge in liquid phase; Under the physical chemistry effect producing in exoelectrical reaction process, the material that blocks fenestra departs from from fenestra, realizes and cleaning.
In the present invention, produce chemical effect and the physical effect of plasma by high pressure pulse discharge, film is carried out to high strength, omnibearing cleaning. Specifically, its principle is for can effectively setting up liquid phase plasma by use short pulse discharge type (preferably adopting voltage is 10 ~ 30KV, the high pressure short pulse that power pulse frequency is 50 ~ 100Hz). Along with the development of power technology, the short voltage rising time that high-voltage pulse discharge in water is used is less than the pulse that 100ns, narrow pulse width be less than several microseconds and is achieved, and therefore between electrode, forms instantaneous high-strength electric field. This instantaneous high-strength electric field can accelerate electronics in the situation that of speeding-up ion not, thereby forms energetic electrons, and electronic impact atom and molecule around, forms plasma channel. In producing this process, be also accompanied by physics and chemistry effect, physical effect is except highfield, can also form ultraviolet light, shock wave, ultrasonic cavitation. Chemical effect is mainly and produces various active materials, as the OH of instantaneous existence, O, HO2The H growing with life period2O2And O3Deng material. That is to say, discharge in water can produce highfield, strong oxidizing property free radical, ultraviolet light and four kinds of action effects of shock wave simultaneously.
Filter membrane is under the effect of shock wave and ultrasonic wave (ultrasonic hole) like this, and the material adhering 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 ray has very strong luminous energy, can make the organic chemical bond that is attached to film surface fracture occur and decompose, and ultraviolet ray has very strong penetration capacity, thus membrane-permeable top layer deeply reach several microns of generation effects. After ultra-violet radiation is absorbed by bulk solution, make dissolved oxygen produce the organic matter that excited oxygen atom is degraded in contaminated film. In addition, in liquid phase, carry out high pressure pulse discharge and can produce OH, O, HO2And H2O2And O3Strong oxidizing property material, oxidation diffuses to the organic matter water in film, thereby reaches the object of 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 one side connection of clean container upper end is provided with water inlet pipe, clean container inner chamber middle part is horizontally disposed with metal net shaped earth electrode, earth electrode one end connects clean container ground connection by an earth connection, clean container is also communicated with and is provided with outlet pipe away from the bottom of water inlet pipe one side, top position, described earth electrode middle part is vertically just to being provided with needle electrode, needle electrode upper end is connected with high-voltage pulse power source by power switch after fixing and pass 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 exceed after needle electrode lower end position, open outlet pipe and realize flowing of rinse water, ensure that discharge process middle water level is higher than needle electrode lower end simultaneously;
C, power-on switch then, utilize high-voltage pulse power source power supply, and make to form in the liquid phase between needle electrode and earth electrode corona discharge, glow discharge or streamer-discahrge, under the physical chemistry effect producing in exoelectrical reaction process, the material that blocks fenestra enters in rinse water and with current and flows out from outlet pipe, completes cleaning.
After optimizing like this, adopted simple cleaning device, shirtsleeve operation step, has realized above-mentioned cleaning process, and the unique texture of cleaning device can be beneficial to the generation of electric discharge phenomena more. Simultaneously when discharge cleaning, filter membrane in mobile cleaning fluid, can be better by the tamper being hit and depart from downstream stream take out of, improve cleaning efficiency.
As further optimization, described outlet pipe comprises adjacent the second outlet pipe that is arranged at the first outlet pipe of earth electrode top and is positioned at clean container bottom position. After optimizing like this, be provided with two outlet pipes, because in to filter membrane Discharge Cleaning process, part film hole plug thing can be gone out by the percussion of electric discharge phenomena to the direction of filter membrane top, 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 stop up by filter membrane, has so just greatly ensured 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 in discharge process clean container in air-tight state. Can make like this gaseous active compounds that makes full use of high pressure pulse discharge generation in cleaning process as O3Deng, O3Be attached to the pollutant on fenestra etc. soluble in water and removal. In addition, can make the positive and negative that is cleaned film have suitable pressure difference value in the high-voltage pulse effect of closed container mesohigh Pulsed Discharge, strengthen being blocked in the removal of the pollutant in fenestra, thereby can ensure better discharge effect.
As further optimization, high-voltage pulse power source voltage is 10 ~ 30KV, power pulse frequency is 50 ~ 100Hz, the rinse water electrical conductivity adding 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. It should be noted that: destroy membrane structure in order to make plasma channel not reach earth electrode one end, discharge type not can be arc discharge simultaneously.
As further optimization, earth electrode is set to the poroid wire netting that aperture is 5 ~ 20 μ m. Can effectively prevent like this that the shock wave producing because of high pressure pulse discharge is excessive damages film. In addition,, by relatively needle electrode being positioned over to the test of film top and bottom, while finding needle electrode to be positioned over film upper end, membrane flux recovery rate, than the height of lower end, is therefore positioned over needle electrode film upper end.
The invention has the beneficial effects as follows and clean a kind of efficient, easy method that provides for film. By adjusting the parameters such as electrode spacing, pulse voltage and pulse frequency, electrode diameter and rinse water electrical conductivity, make the material that is blocked in fenestra and film surface be removed or degrade, thereby membrane flux is restored.
In sum, the present invention can realize high-efficiency washing to filter membrane, and fast quick-recovery membrane flux reaches film regeneration, has the cleaning frequency short, and cost is low, effective advantage.
Brief description of the drawings
Fig. 1 is the structural representation sketch of the cleaning device that adopts while specifically implementing of the present invention.
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 one side connection of clean container upper end is provided with water inlet pipe 5, clean container inner chamber middle part is horizontally disposed with metal net shaped earth electrode 2, earth electrode 2 one end connect clean container ground connection by an earth connection, clean container is also communicated with and is provided with outlet pipe away from the bottom of water inlet pipe one side, described earth electrode 2 top positions, middle part are vertically just to being provided with needle electrode 1, needle electrode 1 upper end is connected with high-voltage pulse power source by power switch 3 after fixing and pass container cover,
When b, cleaning, first open clean container, filter membrane to be cleaned 4 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 exceed after needle electrode lower end position, open outlet pipe and realize flowing of rinse water, ensure that discharge process middle water level is higher than needle electrode lower end simultaneously;
C, power-on switch then, utilize high-voltage pulse power source power supply, and make to form in the liquid phase between needle electrode and earth electrode corona discharge, glow discharge or streamer-discahrge, under the physical chemistry effect producing in exoelectrical reaction process, the material that blocks fenestra enters in rinse water and with current and flows out from outlet pipe, completes cleaning.
In the present embodiment, described outlet pipe comprises adjacent the second outlet pipe 7 that is arranged at the first outlet pipe 6 of earth electrode top and is positioned at clean container bottom position. Be provided with like this two outlet pipes, because in to filter membrane Discharge Cleaning process, part film hole plug thing can be gone out by the percussion of electric discharge phenomena to the direction of filter membrane top, 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 stop up by filter membrane, so just greatly ensured cleaning performance.
In the present embodiment, closing containers lid before electric discharge, makes in discharge process clean container in air-tight state. Can make like this gaseous active compounds that makes full use of high pressure pulse discharge generation in cleaning process as O3Deng, O3Be attached to the pollutant on fenestra etc. soluble in water and removal. In addition, can make the positive and negative that is cleaned film have suitable pressure difference value in the high-voltage pulse effect of closed container mesohigh Pulsed Discharge, strengthen being blocked in the removal of the pollutant in fenestra, thereby can ensure better discharge effect.
In the present embodiment, high-voltage pulse power source voltage is 10 ~ 30KV, power pulse frequency is 50 ~ 100Hz, the rinse water electrical conductivity adding 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. It should be noted that: destroy membrane structure in order to make plasma channel not reach earth electrode one end, discharge type not can be arc discharge simultaneously.
In the present embodiment, earth electrode is set to the poroid wire netting that aperture is 5 ~ 20 μ m. Can effectively prevent like this that the shock wave producing because of high pressure pulse discharge is excessive damages film. In addition,, by relatively needle electrode being positioned over to the test of film top and bottom, while finding needle electrode to be positioned over film upper end, membrane flux recovery rate, than the height of lower end, is therefore positioned over needle electrode film upper end.
In the present embodiment, filter membrane to be cleaned is inorganic ceramic membrane, and when filter membrane is positioned on earth electrode, flow path direction one side surface that meets water in filter membrane use procedure (being contaminated one side) upward. In high pressure pulse discharge, the active material of discharge generation generates near needle electrode tip, and pollution is faced up and can make the pollutant being blocked in fenestra more effectively be degraded by active material. In addition, the result in condition heuristic process also shows, with respect to pollution is faced down, in discharge process, pollution is faced up and can 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 see, after turning on the power switch, needle electrode carries out positive polarity electric discharge, and many short streamer passages form, and in the streamer of formation, a little white portion is surrounded by the thin layer of a magenta. A large amount of minute bubbles form near electrode. Observe a large amount of hydroxyl radical free radical, hydroperoxyl radical and other active materials of producing in discharge process by emission spectrum. 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, it is characterized in that, filter membrane to be cleaned is placed in to liquid phase, then adopts high-voltage pulse power source to carry out discharge in water by electrode pair filter membrane to be cleaned, make to occur corona discharge, glow discharge or streamer-discahrge in liquid phase; Under the physical chemistry effect producing in exoelectrical reaction process, the material that blocks fenestra departs from from fenestra, realizes and cleaning.
2. filter membrane cleaning method as claimed in claim 1, is characterized in that, specifically comprises 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 one side connection of clean container upper end is provided with water inlet pipe, clean container inner chamber middle part is horizontally disposed with metal net shaped earth electrode, earth electrode one end connects clean container ground connection by an earth connection, clean container is also communicated with and is provided with outlet pipe away from the bottom of water inlet pipe one side, top position, described earth electrode middle part is vertically just to being provided with needle electrode, needle electrode upper end is connected with high-voltage pulse power source by power switch after fixing and pass 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 exceed after needle electrode lower end position, open outlet pipe and realize flowing of rinse water, ensure that discharge process middle water level is higher than needle electrode lower end simultaneously;
C, power-on switch then, utilize high-voltage pulse power source power supply, and make to form in the liquid phase between needle electrode and earth electrode corona discharge, glow discharge or streamer-discahrge, under the physical chemistry effect producing in exoelectrical reaction process, the material that blocks fenestra enters in rinse water and with current and flows out from outlet pipe, completes cleaning.
3. filter membrane cleaning method as claimed in claim 2, is characterized in that, described outlet pipe comprises adjacent the second outlet pipe that is arranged at the first outlet pipe of earth electrode top and is 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 in discharge process clean container 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 adding 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, is characterized in that, earth electrode is set to the poroid wire netting that aperture is 5 ~ 20 μ m.
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| CN111151144B (en) * | 2020-01-07 | 2020-11-06 | 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 |
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 |
| 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 |
| 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 |
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Effective date of registration: 20240722 Address after: Building 6, No. 15 Fengsheng Road, Jinfeng Town, High tech Zone, Jiulongpo District, Chongqing, China 401329 Patentee after: Chongqing Xinhe Qiyue Environmental Protection Engineering Co.,Ltd. Country or region after: China Address before: 401329 no.27-5, Fengsheng Road, Jiulongpo District, Chongqing Patentee before: Chongqing Xinhe Qiyue Technology Co.,Ltd. Country or region before: China |
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