CN103801195A - Improved forward-osmosis membrane assembly for reducing concentration polarization and application thereof - Google Patents

Improved forward-osmosis membrane assembly for reducing concentration polarization and application thereof Download PDF

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Publication number
CN103801195A
CN103801195A CN201410075646.6A CN201410075646A CN103801195A CN 103801195 A CN103801195 A CN 103801195A CN 201410075646 A CN201410075646 A CN 201410075646A CN 103801195 A CN103801195 A CN 103801195A
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China
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liquid
osmosis membrane
draw
membrane assembly
chamber
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CN201410075646.6A
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Chinese (zh)
Inventor
张捍民
程世营
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Dalian University of Technology
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Dalian University of Technology
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Priority to CN201410075646.6A priority Critical patent/CN103801195A/en
Publication of CN103801195A publication Critical patent/CN103801195A/en
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Abstract

The invention discloses an improved forward-osmosis membrane assembly for reducing concentration polarization and an application thereof, and belongs to the technical field of wastewater treatment in the environment engineering. The forward-osmosis membrane assembly comprises two flat plates, a gasket, a forward-osmosis film and a metal net, wherein the gasket and the forward-osmosis film are clamped between two flat plates; a raw material liquid chamber and a draw liquid chamber are formed in two sides of the forward-osmosis film respectively; one metal net is arranged in each of the raw material liquid chamber and the draw liquid chamber; the raw material liquid chamber and the draw liquid chamber are filled with a raw material liquid and a draw liquid respectively; osmosis pressure of the raw material liquid is less than that of the draw liquid; and pure water separation is realized under the effect of osmosis pressure difference of liquids on two sides of the film. Through perturbation action and mass transfer acceleration of the metal net on flow, the concentration polarization in the operation can be reduced, and water flux operation effect can be improved; the forward-osmosis membrane assembly is simple in structure, flexible to run and convenient to operate, applicable to modularization and integration reactor design and wide in application prospect in field of direct extraction of drinking water.

Description

A kind of modified forward osmosis membrane assembly and application thereof that slows down concentration polarization
Technical field
The invention belongs to field of environment engineering technology, relate to a kind of modified forward osmosis membrane assembly and application thereof that slows down concentration polarization, in running, reach by the wire netting of introducing perturbation action in the appropriate location of membrane module the object that slows down concentration polarization.
Background technology
Along with the increase of population, shortage of water resources phenomenon is increasingly serious, even becomes one of very important factor of restriction social sustainable development.Based on membrane separation technique, without advantages such as phase transformation, low energy consumption, normal-temperature operation, being applied to reutilization of the sewage has day by day become one of a kind of Perfected process that solves shortage of water resources.And be subordinated to the positive osmosis process of membrane separation technique, and the driving force that only relies on the solution permeable pressure head of film both sides to pass through as pure water, energy consumption is low; And film pollution is slight, reduces operation complexity, in recent years has the trend that replaces gradually traditional pressure-driven type membrane process.At present positive infiltration technology attempt to some extent by, medicine concentrated at food, the energy, sewage purification and desalinization field.
Although there is above-mentioned advantage, in actual moving process, due to the existence of concentration polarization (especially in concentration polarization) phenomenon, cause the actual water flux of positive infiltration technology will be far below its theoretical water flux.The people such as McCutcheon also point out than outer concentration polarization phenomenon, and the actual water flux that interior concentration polarization phenomenon aligns process of osmosis plays a leading role.Can say, the sizable application that has high input as early as possible for positive infiltration technology that slows down of interior concentration polarization plays a part very important.
Be directed to outer concentration polarization phenomenon, the modes such as the current multiplex increase fluid of people cross-flow rate weaken it; But this weakening effect certainly will be take extra energy resource consumption (causing by improving cross-flow rate) as cost; Be directed to interior concentration polarization phenomenon, the people such as N.Ma have proposed a kind of method that forward osmosis membrane supporting layer is carried out to modification and have slowed down interior concentration polarization, but this method of modifying process complexity, and the real industrial applications of distance also has a very long segment distance.Therefore, find a kind of simple and direct, slow down the concentration polarization phenomenon existing in positive infiltration technology cheaply and just seem highly significant.
Summary of the invention
Object of the present invention is to be improved traditional just infiltration plate film assembly, do not increasing under the condition of energy consumption, it is completed when pure water separates and can significantly slow down the concentration polarization occurring in running, finally improve the aquifer yield on its elementary membrane area.
A kind of modified forward osmosis membrane assembly that slows down concentration polarization, this forward osmosis membrane assembly comprises two flat boards, pad, forward osmosis membrane, wire netting, two dull and stereotyped middle accompany pad and forward osmosis membranes, forward osmosis membrane both sides form respectively material liquid chamber and draw sap cavity chamber, at material liquid chamber with draw sap cavity chamber and be respectively provided with a wire netting.Wherein, in material liquid chamber centre position with draw sap cavity chamber and be adjacent on the position of film by the support fixing metal net in chamber.
Utilize peristaltic pump to material liquid chamber and draw sap cavity chamber perfusion material liquid and draw liquid, the osmotic pressure of material liquid is lower than the osmotic pressure that draws liquid; Under the effect of film both sides solution permeable pressure head, the water in material liquid is penetrated into and is drawn in sap cavity chamber by forward osmosis membrane, realizes the separation of water.Be positioned at material liquid or draw the indoor wire netting of sap cavity by the perturbation action of convection cell, the concentration polarization phenomenon that mass transfer facilitation slows down emerged in operation, finally reach the object that promotes water flux operational effect.
Effect of the present invention and benefit are by the simple reformation of the forward osmosis membrane assembly to traditional, add wire netting at material liquid chamber away from the position of film, or draw sap cavity chamber press close to film position add wire netting, the flow disturbance effect that just can cause by wire netting to a certain extent and mass transfer enhancement are used for slowing down the concentration polarization (outer concentration polarization and interior concentration polarization) occurring in running.Especially at material liquid chamber and draw sap cavity chamber and all settle after wire netting, find through actual motion test, this improved positive permeability apparatus is compared to traditional dull and stereotyped forward osmosis membrane assembly, and its water flux can reach at least 14% lifting amplitude.What experiment confirmed that the method is conducive to promote positive infiltration technology really saves energy and reduce the cost, realizes sustainable development.This improved positive permeability apparatus simple structure, flexible operation, easy to operate, be suitable for modularization and integrated reactor design, in desalinization and sewage, directly extract in drinking water field and be with a wide range of applications.In addition, also can be applied to the concentrated etc. of fruit juice in grocery trade.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of the modified forward osmosis membrane assembly that slows down concentration polarization.
Fig. 2 is the plane of wire netting.
Fig. 3 is material liquid chamber/draw sap cavity chamber wire netting fixture enlarged drawing.
In figure: 1 draws liquid water inlet; 2 draw liquid delivery port; 3 wire nettings; 4 forward osmosis membranes;
5 draw sap cavity chamber; 6 material liquid chambers; 7 material liquid water inlets; 8 material liquid delivery ports;
9 wire netting fixtures; 10 pads.
The specific embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with technical scheme and accompanying drawing.
Embodiment
Slow down a modified forward osmosis membrane assembly for concentration polarization, the structure of membrane module: transparent lucite flat board, centre is 4mm by pad 10(spacer thickness) and the obstruct of forward osmosis membrane 4 form material liquid chamber and draw sap cavity chamber.Forward osmosis membrane is of a size of 2.1cm × 20cm.The material liquid chamber forming and the size of drawing sap cavity chamber are length × wide × height=2.1cm × 20cm × 4mm.Forward osmosis membrane active layer is towards material liquid, and material liquid is sewage, and drawing liquid is high concentration chlorination sodium solution.Shown in accompanying drawing, wire netting (eyelet specification is 3.5mm × 3.5mm) is placed on the correspondence position of membrane module to specifications, and fixes by the wire netting fixture in chamber.Wherein, be arranged in the spacing that the wire netting of material liquid chamber and forward osmosis membrane keep 2mm, be arranged in the wire netting and the forward osmosis membrane that draw sap cavity chamber and be the state of being adjacent to.Start peristaltic pump, material liquid enters via material liquid water inlet 7, and material liquid delivery port 8 flows out; Draw liquid and flow into via drawing liquid water inlet 1, draw liquid delivery port 2 and flow out.Now, forward osmosis membrane 4 both sides will form the permeable pressure head of solution, and under the driving force of this permeable pressure head, the hydrone in material liquid chamber 6 will enter into and draw sap cavity chamber 5 through forward osmosis membrane 4.
Found that, at active layer under the film orientation of material liquid, be positioned at the position that the wire netting of material liquid chamber is placed in away from film and (can promote face fluid turbulence degree, slow down concentrated outer concentration polarization), be positioned at the wire netting that draws sap cavity chamber and be placed in the position that is adjacent to film and (can impel and draw liquid solute and accumulate at film supporting layer, improve the permeable pressure head of film both sides, slow down concentration polarization in dilution) reach best operational effect, outer concentration polarization and interior concentration polarization phenomenon all improve.Compared with not settling the experiment of wire netting, water flux has respectively 5.4% and 9% lifting; In addition, when at material liquid chamber and draw sap cavity chamber while all settling wire netting, compared with not settling the experiment of wire netting, its water flux has promoted 14%.The optimized design of wire netting size is found: the perforation size of wire netting has best water flux and promotes effect while being 3.5mm × 3.5mm.

Claims (8)

1. one kind is slowed down the modified forward osmosis membrane assembly of concentration polarization, it is characterized in that, this forward osmosis membrane assembly comprises two flat boards, pad, forward osmosis membrane, wire netting, two dull and stereotyped middle accompany pad and forward osmosis membranes, forward osmosis membrane both sides form respectively material liquid chamber and draw sap cavity chamber, at material liquid chamber with draw sap cavity chamber and be respectively provided with a wire netting.
2. modified forward osmosis membrane assembly according to claim 1, is characterized in that, described wire netting lays respectively at material liquid chamber centre position and draw sap cavity chamber the position that is adjacent to film.
3. modified forward osmosis membrane assembly according to claim 1 and 2, is characterized in that, described wire netting, and its mesh size is 3.5mm × 3.5mm.
4. modified forward osmosis membrane assembly according to claim 1 and 2, is characterized in that, described pad is rubber sheet gasket.
5. modified forward osmosis membrane assembly according to claim 3, is characterized in that, described pad is rubber sheet gasket.
6. the application of the modified forward osmosis membrane assembly described in claim 1 or 2 or 5, is characterized in that, to material liquid chamber with draw sap cavity chamber perfusion material liquid and draw liquid, the osmotic pressure of material liquid is lower than the osmotic pressure that draws liquid; Under the effect of film both sides solution permeable pressure head, the hydrone in material liquid is penetrated into and is drawn in sap cavity chamber by forward osmosis membrane, realizes pure water and separates.
7. the application of modified forward osmosis membrane assembly claimed in claim 3, is characterized in that, to material liquid chamber with draw sap cavity chamber perfusion material liquid and draw liquid, the osmotic pressure of material liquid is lower than the osmotic pressure that draws liquid; Under the effect of film both sides solution permeable pressure head, the hydrone in material liquid is penetrated into and is drawn in sap cavity chamber by forward osmosis membrane, realizes pure water and separates.
8. the application of modified forward osmosis membrane assembly claimed in claim 4, is characterized in that, to material liquid chamber with draw sap cavity chamber perfusion material liquid and draw liquid, the osmotic pressure of material liquid is lower than the osmotic pressure that draws liquid; Under the effect of film both sides solution permeable pressure head, the hydrone in material liquid is penetrated into and is drawn in sap cavity chamber by forward osmosis membrane, realizes pure water and separates.
CN201410075646.6A 2014-03-04 2014-03-04 Improved forward-osmosis membrane assembly for reducing concentration polarization and application thereof Pending CN103801195A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105435641A (en) * 2016-01-06 2016-03-30 大连理工大学 Forward permeable membrane cross-flow filtration device for retarding concentration polarization and membrane pollution through folded plate vortex increasing
CN106044950A (en) * 2016-07-22 2016-10-26 中南林业科技大学 Forward osmosis treatment system of saline-alkaline water and treatment method thereof
CN106830192A (en) * 2017-01-24 2017-06-13 上海大学 Forward osmosis membrane water treatment facilities
US10272387B2 (en) 2016-05-06 2019-04-30 Tongji University Modified forward osmosis membrane module for flow regime improvement

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN201036732Y (en) * 2007-03-30 2008-03-19 西安建筑科技大学 Small-sized multifunctional plate film separating experimental device
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Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN201036732Y (en) * 2007-03-30 2008-03-19 西安建筑科技大学 Small-sized multifunctional plate film separating experimental device
US20120174639A1 (en) * 2011-01-11 2012-07-12 Herron John R Food Waste Concentration System and Related Processes

Non-Patent Citations (1)

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Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105435641A (en) * 2016-01-06 2016-03-30 大连理工大学 Forward permeable membrane cross-flow filtration device for retarding concentration polarization and membrane pollution through folded plate vortex increasing
US10272387B2 (en) 2016-05-06 2019-04-30 Tongji University Modified forward osmosis membrane module for flow regime improvement
CN106044950A (en) * 2016-07-22 2016-10-26 中南林业科技大学 Forward osmosis treatment system of saline-alkaline water and treatment method thereof
CN106830192A (en) * 2017-01-24 2017-06-13 上海大学 Forward osmosis membrane water treatment facilities
CN106830192B (en) * 2017-01-24 2020-09-04 上海大学 Forward osmosis membrane water treatment device

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Application publication date: 20140521