CN103463985B - Osmosis membrane assembly for dielectrophoresis forward-osmosis flat plate - Google Patents
Osmosis membrane assembly for dielectrophoresis forward-osmosis flat plate Download PDFInfo
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- CN103463985B CN103463985B CN201310409362.1A CN201310409362A CN103463985B CN 103463985 B CN103463985 B CN 103463985B CN 201310409362 A CN201310409362 A CN 201310409362A CN 103463985 B CN103463985 B CN 103463985B
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Abstract
The invention relates to an osmosis membrane assembly for a dielectrophoresis flat plate. The osmosis membrane assembly comprises a flat plate framework, electrodes and an osmosis membrane, and is characterized in that the flat plate framework is manufactured from ABS (Acrylonitrile-Butadiene-Styrene); uniformly distributed electrodes are transversely embedded in the flat plate framework at intervals; an osmosis membrane is arranged in the flat plate framework in a penetrating manner; a water inlet is formed in the water inlet end of the flat plate framework; an electric wire output port and a water outlet are formed in the water outlet end of the flat plate framework; the water inlet is connected with the water outlet in a penetrating manner through a water channel inside the flat plate framework; the electric wire output port is connected with the electrodes of the flat plate framework, and is lead out to be connected with an external power supply. With the dielectrophoresis technology, according to the difference of dielectric polarization capabilities of solid particles and suspended liquid, dielectric electrophoretic force is used for pushing the solid particles to be away from the electrodes or absorbing the solid particles on the electrodes, and thus the concentration polarization caused by water flowing to a driving liquid side from a raw material liquid side in the separation technology of forward-osmosis flat plate membrane is slowed down or even prevented so as to strengthen the forward-osmosis technology.
Description
Technical field
The invention belongs to separation technology field, relate to osmosis membrane filters separating technology, especially a kind of dielectrophoresis is just permeating dull and stereotyped permeable membrane element.
Background technology
1748, Frenchman Abble Nollot found phenomenon of osmosis, and start thus, phenomenon of osmosis just causes the great interest of people.Just permeate (Forward osm osis, FO) also known as infiltration, referring to that water or other solvent are through natural or artificial pellicle, are delivered to the process of high solute concentration side by low solute concentration side, is a kind of physical phenomenon that occurring in nature extensively exists.Chemical potential difference or the permeable pressure head itself of the feature of positive infiltration technology to be its driving force be two kinds of solution, without the need to impressed pressure.Utilize the spontaneous character being passed through selective pellicle of water in positive infiltration technology, in conjunction with the driving solution being easy to recycle, can be used for the energy consumption of seawater desalination and reduction traditional industrial process.Osmotic pressure is a kind of green energy resource inherently, by positive infiltration technology, osmotic pressure can be converted into electric energy.In addition, due to can not impressed pressure be used in positive process of osmosis, simultaneously due to the hydrophily of forward osmosis membrane material, therefore effectively fouling membrane can be reduced, can be applicable to reverse osmosis technology is difficult in the process of the waste water realized, such as dyeing waste-water, rubbish leachate and membrane bioreactor etc.While reduction fouling membrane, the expense of Membrane cleaning and chemical can be reduced to the pollution of environment.Positive permeate recovery is high, and avoid strong brine discharge, environmental friendliness, by selecting suitable driving solution, its Water Sproading rate can reach 75%; And the common reverse osmosis water rate of recovery is 35% ~ 50%, the so high rate of recovery can realize concentrating again of strong brine.Positive penetration operation, owing to having low-temp low-pressure feature, can be widely used in the aspects such as the concentrated of liquid food and insoluble drug release.
In theory, just permeating the driving liquid that can adopt and have very high osmotic pressure and realizing the membrane flux larger than counter-infiltration, but research finds that real fluxes is far smaller than desired value, this causes due to concentration polarization phenomenon distinctive in positive process of osmosis.In positive process of osmosis, the position classification occurred according to concentration polarization, can be divided into outer concentration polarization and interior concentration polarization.
External concentration polarization phenomenon occurs in the outside on film surface, and internal concentration polarization refers to the concentration polarization phenomenon of the inside, porous support layer space occurring in asymmetric membrane.In symmetry homogeneous membrane, usually there is not internal concentration polarization phenomenon, internal concentration polarization is specific phenomenon in positive process of osmosis.In forward osmosis membrane separation process, when water flows to driving liquid side from material liquid side through film, the solute of material liquid side is due to can not through film, constantly gather at the film surface location near material liquid side, and concentration constantly increases and forms one deck high concentration layer solution, this phenomenon is called concentrated external concentration polarization, and it is similar to the concentration polarization in reverse osmosis process; Meanwhile, in driving liquid side, due to constantly being diluted through the solute made near driving liquid one film surface of water, and one deck diluent zone solution will be formed, this phenomenon just does the external concentration polarization diluted, and it is specific phenomenon in positive process of osmosis.When the porous support layer of forward osmosis membrane is towards material liquid, the solute in material liquid enters in the supporting layer space of film together with water, and forms concentrated polarization layer along film inner porosity, and this phenomenon belongs to concentrated internal concentration polarization; On the contrary, when the porous support layer of forward osmosis membrane is towards driving liquid, the water in material liquid, through after film, will dilute the solute in supporting layer loose structure, and make the polarization layer forming dilution in porous support layer, this phenomenon is called the internal concentration polarization of dilution.
The result of concentration polarization causes the reduction of the osmotic pressure,effective difference of film both sides, and thus drive efficiency declines, and is the key factor affecting flux depression.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, a kind of dielectrophoresis is provided just to permeate dull and stereotyped permeable membrane element, this assembly adopts dielectrophoresis technology can reduce the fouling membrane and stifled film phenomenon even eliminating and occur in positive osmosis process, reaches the positive osmosis process of strengthening, reduces the concentration polarization occurred in positive osmosis process, the target forming electroosmotic effect, improve raw permeable membrane film transit dose.
The object of the invention is to be achieved through the following technical solutions:
The dull and stereotyped permeable membrane element of a kind of dielectrophoresis, comprise dull and stereotyped skeleton, electrode and permeable membrane, it is characterized in that: described dull and stereotyped skeleton adopts ABS to make, in dull and stereotyped skeleton, laterally uniform interval is installed with electrode, at the through installation permeable membrane of dull and stereotyped skeleton, the water inlet end of dull and stereotyped skeleton is provided with water inlet, the water side of dull and stereotyped skeleton is provided with electric wire delivery outlet and delivery port, water inlet is connected with delivery port is through by dull and stereotyped intraskeletal water channel, the Electrode connection of electric wire delivery outlet and dull and stereotyped skeleton, and draw the extraneous power supply of connection.
And described electrode adopts cylindrical interdigitated electrode structure, in often pair of electrode, an electrode adopts insulating electrode, and another root electrode then adopts the bare electrode of anticorrosive.
Advantage of the present invention and good effect are:
1, the present invention uses dielectrophoresis technology, the dielectric polarization ability of the liquid suspended according to solia particle and its different, solia particle is pushed away electrode or is adsorbed on electrode by solia particle by dielectrophoresis force, slow down thus and even avoid just permeating because water is from material liquid effluent to the concentration polarization phenomenon driving liquid side to cause in Flat Membrane separating technology, to reach the positive osmosis process of strengthening.
2, the present invention is while the normal work keeping forward osmosis membrane filtering technique, additional material such as chemical agent or a large amount of water need not be added, reduce and even eliminate the fouling membrane and stifled film phenomenon that occur in positive osmosis process, the concentration polarization even avoiding occurring in positive osmosis process can be slowed down, simultaneously, improve membrane lifetime and membrane flux, the energy that reduction reduces and the pollution problem of elimination forward osmosis membrane consumes and cost.
3, the present invention applies dielectrophoresis force and is moved apart permeable membrane surface in the solid particle closing on forward osmosis membrane surface thus reach and prevent fouling membrane and stifled film, improve forward osmosis membrane film transit dose, slow down and even avoid concentration polarization, to extend operating efficiency and the aquifer yield of forward osmosis membrane service life and raising forward osmosis membrane.
4, the present invention uses dielectrophoresis technology, under electric field action, during solid, liquid contact, solia particle surface can produce electric charge, and these surface charges affect the ion distribution in solution conversely, forms electric double layer, form electroosmotic effect, hydrone drives the migration of liquid side from material liquid side direction, increases forward osmosis membrane transit dose, to reach the positive osmosis process of strengthening.
5, electrode of the present invention adopts cylindrical interdigitated electrode structure, and circular surface makes interdigital electrode forceful electric power scene maximize, and uses minimal material, obtains stronger dielectrophoresis force.
6, the present invention is interrupted applying dielectrophoresis, and can eliminate the problem of fouling membrane, and energy consumption is low, running cost is low.
Accompanying drawing explanation
Fig. 1 is the structural front view of permeable membrane element of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to cross-sectional view;
Fig. 3 is the B portion structure enlarged diagram of Fig. 1;
Fig. 4 is the C portion structure enlarged diagram of Fig. 2;
Fig. 5 is dielectrophoresis permeable membrane element operation principle schematic diagram of the present invention.
Detailed description of the invention
Below by the drawings and specific embodiments, the invention will be further described, but the present invention is not limited to following embodiment, and any change of making in the present embodiment principle or replacement scheme, all fall among the scope of protection of present invention.
The dull and stereotyped permeable membrane element of a kind of dielectrophoresis, as shown in Figure 1, 2, comprises dull and stereotyped skeleton 2, electrode 6 and permeable membrane 4, and dull and stereotyped skeleton adopts ABS to make, and in dull and stereotyped skeleton, laterally uniform interval is installed with electrode, at the through installation permeable membrane of dull and stereotyped skeleton.Electrode adopts cylindrical interdigitated electrode structure, and in often pair of electrode, an electrode adopts insulating electrode, and another root electrode then adopts the bare electrode of anticorrosive, to reduce energy consumption and electrode production cost.The mounting structure of dull and stereotyped skeleton and permeable membrane is the Sandwich Plates structure of replaceable permeable membrane, replaceable when permeable membrane is damaged, and structural detail reuses.The water inlet end of dull and stereotyped skeleton is provided with water inlet 5, electric wire delivery outlet 3 and delivery port 1 is provided with in the water side of dull and stereotyped skeleton, water inlet is connected with delivery port is through by dull and stereotyped intraskeletal water channel, the Electrode connection of electric wire delivery outlet and dull and stereotyped skeleton, and draws the extraneous power supply of connection.
The course of work of the present invention is:
Be soaked in need waste water to be processed (material liquid) by just permeating plate film assembly, liquid is driven to enter assembly inner chamber via water inlet, in forward osmosis membrane the interdigital electrode be arranged in electrode installing port connected by electric wire delivery outlet and power supply, under osmotic pressure effect, water in waste water (material liquid) enters assembly inner chamber through forward osmosis membrane, dilution drives liquid, and dilution is discharged by delivery port 3.Due to the dielectric polarization ability lower relative to water, solid particle is usually expressed as negative dielectrophoresis character in waste water (material liquid); Namely, in unshapeliness electric field, solid particle is moved by weak electric field direction.Waste water (material liquid) is through the surface of forward osmosis membrane, and the interdigital electrode of installing under forward osmosis membrane provides the electric field of the unshapeliness needed for dielectrophoresis force.Distinctive circular surface makes the forceful electric power scene of interdigital electrode maximize, thus uses less material, but can obtain stronger dielectrophoresis force.When in waste water (material liquid), solid particle is near forward osmosis membrane, namely when interdigital electrode, will cannot near forward osmosis membrane by moving apart, so reduce and even eliminate fouling membrane and stifled film must occur, slow down the concentration polarization phenomenon even avoided in positive permeability and separation technique.Due to hydration of ion and formation electric double layer, under electric field action, hydrone drives the migration of liquid side from waste water (material liquid) side direction, improves forward osmosis membrane film transit dose.
Dielectrophoresis concept involved in the present invention and operation principle are:
Dielectrophoresis (Dielectrophoresis) technology has successfully been applied to biomedical industries to be separated, richness is amassed, catch particulate and cell.What this technology described is the translational motion that the neutral corpuscle being positioned at non-well-balanced electric field produces due to the effect of dielectric polarization, produce dipole moment on particulate can by two identical carried charges but opposite polarity electric charge represent.When they are on particle interface during mal-distribution, produce a macroscopical dipole moment.When this dipole moment is arranged in unshapeliness electric field, produce a resulting net force in the difference of the local electric field strength on particulate both sides, be called dielectrophoresis force.Because the particulate be suspended in medium has different dielectric properties (dielectric constant) from medium; particulate can by or the direction of stronger electric-field intensity move; be called positive dielectrophoresis, or the direction of more weak electric-field intensity is moved, be referred to as negative dielectrophoresis.
Being no matter that the separation permeable membrane occurred in forward osmosis membrane isolated by filtration liquid liquid pollutes, is all that solia particle (particulate, colloidal particles, solute crystalline solid, bacterium, and insoluble organic matter drop and larger molecular organics) exists relative to liquid.In such a system, the dielectric polarization ability of the liquid suspended due to solia particle and its different, solia particle is pushed away electrode or is adsorbed on electrode by solia particle by dielectrophoresis force, shows or negative dielectrophoresis character or positive dielectrophoresis character.
Due to the dielectric polarization ability lower relative to water, solid particle is usually expressed as negative dielectrophoresis character in waste water; Namely, in unshapeliness electric field, solid particle is moved by weak electric field direction.As shown in Figure 5, waste water (material liquid) is through the surface of forward osmosis membrane, and the interdigital electrode of installing under forward osmosis membrane provides the electric field of the unshapeliness needed for dielectrophoresis force.Distinctive circular surface makes the forceful electric power scene of interdigital electrode maximize, thus uses less material, but can obtain stronger dielectrophoresis force.So forward osmosis membrane is arranged on the surface of interdigital electrode, when solid particle is near forward osmosis membrane, namely when interdigital electrode, will cannot near forward osmosis membrane by moving apart.The generation of fouling membrane and stifled film is even eliminated in minimizing like this.
As above, due to the dielectric polarization ability lower relative to water, solid particle is usually expressed as negative dielectrophoresis character to principle in waste water (material liquid); Namely, in unshapeliness electric field, solid particle is moved by weak electric field direction.While water flows to driving liquid side from material liquid side through film, solute in material liquid moves apart and cannot near forward osmosis membrane by dielectrophoretic force, solute can not at forward osmosis membrane surface enrichment, so slow down and even avoid just permeating because water is from material liquid effluent to the concentration polarization phenomenon driving liquid side to cause in Flat Membrane separating technology, raising forward osmosis membrane film transit dose.
Claims (2)
1. the dull and stereotyped permeable membrane element of dielectrophoresis, comprise dull and stereotyped skeleton, electrode and permeable membrane, it is characterized in that: described dull and stereotyped skeleton adopts ABS to make, in dull and stereotyped skeleton, laterally uniform interval is installed with electrode, at the through installation permeable membrane of dull and stereotyped skeleton, the water inlet end of dull and stereotyped skeleton is provided with water inlet, the water side of dull and stereotyped skeleton is provided with electric wire delivery outlet and delivery port, water inlet is connected with delivery port is through by dull and stereotyped intraskeletal water channel, the Electrode connection of electric wire delivery outlet and dull and stereotyped skeleton, and draw the extraneous power supply of connection.
2. the dull and stereotyped permeable membrane element of dielectrophoresis according to claim 1, is characterized in that: described electrode adopts cylindrical interdigitated electrode structure, and in often pair of electrode, an electrode adopts insulating electrode, and another root electrode then adopts the bare electrode of anticorrosive.
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| CN104495986B (en) * | 2014-12-17 | 2016-04-13 | 大连理工大学 | A kind ofly remove the positive permeable reactive device of the integrated electrochemistry of emerging organic pollutant in sewage |
| CN104667754B (en) * | 2015-02-10 | 2017-01-11 | 内蒙古天一环境技术有限公司 | Dielectrophoresis in-line type membrane assembly |
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| US4604174A (en) * | 1985-04-30 | 1986-08-05 | Dorr-Oliver Incorporated | High flow electrofiltration |
| GB9411580D0 (en) * | 1994-06-09 | 1994-08-03 | Atomic Energy Authority Uk | Filter cleaning |
| CN101890296B (en) * | 2010-08-09 | 2012-07-04 | 天津富金环境技术研究有限公司 | Dielectrophoresis separation system for recycling precious metals |
| CN102260000B (en) * | 2011-07-22 | 2012-12-12 | 内蒙古介电电泳应用技术研究院 | Process for treating and recycling ammonium chloride rare earth wastewater |
| CN102260002B (en) * | 2011-07-22 | 2013-01-30 | 内蒙古介电电泳应用技术研究院 | Process for treating and recycling rare earth wastewater containing high-concentration sodium chloride and ammonium chloride |
| CN102260001B (en) * | 2011-07-22 | 2012-08-29 | 内蒙古介电电泳应用技术研究院 | Process for treating and recycling rare-earth wastewater containing magnesium sulfate, ammonium sulfate and sulfuric acid |
| CN203507829U (en) * | 2013-09-10 | 2014-04-02 | 内蒙古天一环境技术有限公司 | Dielectrophoresis forward-osmosis flat permeable membrane assembly |
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