CN109692575A - A kind of dual cavity membrane capacitance deionizer - Google Patents

A kind of dual cavity membrane capacitance deionizer Download PDF

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Publication number
CN109692575A
CN109692575A CN201811558299.7A CN201811558299A CN109692575A CN 109692575 A CN109692575 A CN 109692575A CN 201811558299 A CN201811558299 A CN 201811558299A CN 109692575 A CN109692575 A CN 109692575A
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collector
diaphragm
dual cavity
membrane capacitance
deionizer
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CN201811558299.7A
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CN109692575B (en
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刘勇
袁勋
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Qingdao University of Science and Technology
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Qingdao University of Science and Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D61/00Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis, ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42Electrodialysis; Electro-osmosis Electro-ultrafiltration
    • B01D61/44Ion-selective electrodialysis
    • B01D61/46Apparatus therefor
    • B01D61/48Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124Water desalination

Abstract

The invention belongs to membrane capacitance deionizer technical fields, disclose a kind of dual cavity membrane capacitance deionizer.Water stream channel diaphragm is respectively set in the upper/lower terminal of anion/cation exchange membrane for double-cavity structure, first chamber and second chamber in the membrane capacitance deionizer, makes raw water serpentine-like flowing in the water stream channel diaphragm of dual cavity.Film deionizer resistance to mass tranfer is small, low energy consumption for desalination for this, desalting effect is preferable.

Description

A kind of dual cavity membrane capacitance deionizer
Technical field
The present invention relates to membrane capacitance deionizer, in particular to a kind of dual cavity membrane capacitance deionizer.
Background technique
Since second industrial revolution, with the fast development of the first secondary industry and the continuous growth of population, the whole world Available freshwater resources and the ever-increasing freshwater resources demand of the mankind become one of principal contradiction of 21 century.Currently, Various countries begin through rationally utilize and water conservation in the way of alleviate water resources crisis, however it is envisaged that, this kind of solution Mode is palliative.Then, how to efficiently use the ocean of 4/5ths areas and Lake Water on the earth (i.e. seawater and Bitter) become and can fundamentally solve this contradictory effective way.Currently, the solid for seawater and bitter is outstanding The problems such as floating object, sterilization, has been provided with highly developed technological means, and unique technical issues that need to address are reasonable The desalination of seawater and bitter is realized under energy consumption condition.
The more mature desalination process currently existed regarding to the issue above have it is following it is several include: distillation, ion Exchange, reverse osmosis, electrodialysis etc..As human society is for efficient, green, low energy consumption, novel desalination skill without secondary pollution The demand of art increasingly increases, since the sixties in last century, capacitive deionization technology (Capacitive Deionization, CDI), by its advantage such as efficient, energy saving, green, without secondary pollution, rapid development is as potential desalting technology.Electricity Hold deionization technology using the material with bigger serface as electrode for capacitors, the double electricity generated using surface when electrode polarization Layer realizes the purpose of desalination as storage medium, using electric field force as driving force.In desalination processes, electrolysis water etc. in order to prevent The generation of electrochemical process, then the voltage that electrode surface applies are normally controlled in 1.23V hereinafter, being exactly this low voltage operating mode Determine that capacitive deionization technology has apparent energy demand advantages with respect to other electroluminescent desalting technologies (such as electrodialysis);Meanwhile with Chemical decladding process (such as ion-exchange) is different, and capacitive deionization technology does not need cumbersome chemical regeneration process, it is only necessary to Device is shorted, electrode regeneration can be realized, therefore secondary pollution will not be generated;With thermotropic desalting technology, (such as distillation is dodged Steam), capacitive deionization has higher capacity usage ratio, and due to above-mentioned advantage, the design of capacitive deionization unit module is As a research hotspot.
But during capacitive deionization, since ion is usually to exist in the form of ion pair, they are not reasonable Realize out-phase electrode adsorption with thinking, in other words, some anion carry movement near cathode by cation, meanwhile, some Cation is carried by anion to be moved to positive neighbouring (" same to ionic adsorption "), this undoubtedly hinders capacitive deionization process, Its lower adsorption efficiency is resulted in, so that capacitive deionization module has to move towards enlargement, and is difficult to realize and " flows through Formula " (single pass) processing.In order to solve this problem, researcher proposes a solution, i.e., by amberplex Capacitive deionization electrode surface is added, using amberplex to ion selectivity permeability, has effectively contained and " has been inhaled with ion It is attached ", referred to as membrane capacitance deionization (Membrane Capacitive Deionizaiton, MCDI) system;Such as Chinese patent CN101337717A discloses a kind of high efficiency energy-conserving every dual cavity membrane capacitance deionizer, between partition and electrode It joined amberplex, the device power consumption and cost greatly reduced, Chinese patent CN104817143A discloses a kind of sense Formula film electric adsorption module is answered, only two metal plates connect to power supply the technical solution up and down, and amberplex realization is added Low energy consumption desalination.
The structure that the dual cavity membrane capacitance deionizer of amberplex is added is basic identical with the structure of Fig. 1, however, There are following technical problems for existing membrane capacitance deionization system: one, ion has to pass through amberplex, this undoubtedly increase from The resistance to mass tranfer that son moves in the solution, thus, the desalination specific energy consumption (energy of removal unit mass ion is improved to a certain extent Consumption);Two, since the addition of amberplex, ion equally have to pass through amberplex in regeneration desorption process, this is allowed for Electrode regeneration process can not be completed by being simply shorted, it is necessary to apply backward voltage, this is just further to improve its energy Consumption, and the recycling of energy also brings inconvenience;Three, contact of the amberplex with electrode surface can generate contact resistance, this Portion of energy can be caused to consume with form of thermal energy, while can also hinder the desalting efficiency of capacitive deionization.
In conclusion provide one kind can avoid huge resistance to mass tranfer caused by whole ions across ion exchange membranes, Desalination energy consumption can be utmostly reduced again while can also improve the dual cavity membrane capacitance deionizer of desalting effect, and there is weight Want meaning.
Summary of the invention
In order to solve, membrane capacitance deionizer resistance to mass tranfer in the prior art is big, desalination energy consumption is high and desalting effect Bad technical problem, the present invention provides a kind of dual cavity membrane capacitance deionizers.
In order to solve the above-mentioned technical problem, the invention adopts the following technical scheme:
A kind of dual cavity membrane capacitance deionizer, the deionizer are double-cavity structure, first chamber and second Water stream channel diaphragm is respectively set in the upper/lower terminal of anion/cation exchange membrane in chamber, makes raw water in the water stream channel of dual cavity Serpentine-like flowing in diaphragm.
Specifically, the first chamber includes the first collector being cascading up and down, first electrode material, first Diaphragm, anion/cation exchange membrane, the first diaphragm, first electrode material and common collector;The second chamber include up and down according to The secondary common collector being stacked, second electrode material, the second diaphragm, male/female amberplex, the second diaphragm, Two electrode materials and the second collector.
The positive/negative of first collector, common collector and the second collector and DC power supply provided by the invention connects. If the amberplex of the first chamber is anion-exchange membrane, the amberplex of the second chamber is sun Amberplex, then first collector is connect with the anode of a DC power supply, and second collector is straight with another The anode connection in galvanic electricity source, the common collector are connect with the cathode of above-mentioned two DC power supply respectively.If described first The amberplex of chamber is cation-exchange membrane, then the amberplex of the second chamber is anion-exchange membrane, Then the positive/negative connection relationship of each collector and above-mentioned two DC power supply is just the opposite.
The collector is not particularly limited, as long as having good chemical inertness and conductive material to be prepared i.e. It can, it is preferable that the first collector, common collector and the second collector provided by the invention are that plate is prepared by graphite or titanium Material.
The electrode material is the carbon materials with good electrochemical electrical conductivity, high-specific surface area and suitable pore-size distribution Material, it is preferable that first electrode material and second electrode material provided by the invention be by active carbon, carbon fiber, carbon nanotube or The carbon material film that one or more of graphene is prepared can be prepared into carbon material film by modes such as blade coatings.
The diaphragm material is needed with cloth made of good insulation properties material or grid, it is preferable that provided by the invention First diaphragm and the second diaphragm are selected from non-woven fabrics, glass fabric, terylene net or Buddhist nun's human relations net;First diaphragm and the second diaphragm With a thickness of 100-200 μm, consistency is greater than 300 mesh.
Preferably, dual cavity membrane capacitance deionizer provided by the invention further includes being arranged in the first chamber The securing plate of reinforcement effect is played below the square and described second chamber.
Compared with the membrane capacitance deionizer of the prior art, dual cavity membrane capacitance deionizer tool provided by the invention Have the advantage that one, compared with traditional single-chamber room membrane capacitance deionizer, 50% ion is without pass through ion exchange Film reduces ion motion resistance, final to realize low energy consumption desalination;Traditional single-chamber room membrane capacitance deionization is split as two-chamber It behind room, is equivalent to and has carried out two stage treatment, device adsorption capacity can be promoted, and can be improved desalting efficiency;Two, dual cavity Membrane capacitance deionizer is using the diaphragm between electrode material and amberplex as water stream channel, using snakelike water flow stream Flowing mode;This water flow mode has apparent time of contact advantage than conventional film capacitive deionization device, i.e. water flow has more It is more with electrode material contacts and adsorption machine meeting, further improve the desalting efficiency of raw water;Three, since dual cavity membrane capacitance is gone In ion unit, water flow flows between amberplex and electrode, it is no longer necessary to complete regenerative process by backward voltage, together When inhibit contact resistance, to further reduced energy consumption.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the membrane capacitance deionizer of the prior art;
Fig. 2 is a kind of structural schematic diagram of the bicavate membrane capacitance deionizer of embodiment provided by the present invention;
Fig. 3 is the desalination of dual cavity membrane capacitance deionizer and conventional film capacitor deionizing instrument provided by the present invention The conductivity transient change comparison diagram of process;
Fig. 4 is the desalination of dual cavity membrane capacitance deionizer and conventional film capacitor deionizing instrument provided by the present invention Energy consumption figure;
Fig. 5 is the de- of provided dual cavity membrane capacitance deionizer and conventional film capacitor deionizing instrument of the invention The specific energy consumption and water flux density figure of salt treatment.
Specific embodiment
The invention discloses a kind of dual cavity membrane capacitance deionizer, those skilled in the art can be used for reference in this paper Hold, is suitably modified components and is achieved.In particular, it should be pointed out that all similar substitutions and modifications are to those skilled in the art It is it will be apparent that they are considered as including in the present invention for member.Method of the invention and application by compared with Good embodiment is described, related personnel obviously can not depart from the content of present invention, in spirit and scope to as described herein Methods and applications are modified or appropriate changes and combinations, carry out implementation and application the technology of the present invention.
Embodiment 1
As shown in Fig. 2, the deionizer is two-chamber the present invention provides a kind of dual cavity membrane capacitance deionizer Water stream channel diaphragm is respectively set in the upper/lower terminal of anion/cation exchange membrane in cell structure, first chamber and second chamber, makes Raw water serpentine-like flowing in the water stream channel diaphragm of dual cavity.Specifically, the first chamber includes stacking gradually to set up and down The first collector 1, first electrode material 2, the first diaphragm 3, anion-exchange membrane 8, the first diaphragm 3 set, first electrode material 2 With common collector 4;The second chamber includes the common collector 4 being cascading up and down, second electrode material 5, the second diaphragm 6, cation-exchange membrane 9, the second diaphragm 6, second electrode material 5 and motor and the second collector 7;Described first Collector 1, the common collector 4 and second collector 7 are connect with the positive/negative of DC power supply;First diaphragm With the second diaphragm with a thickness of 100-200 μm, consistency is greater than 300 mesh, above the first chamber and the second chamber Lower section has also set up the securing plate of reinforcement effect.
Wherein, the first collector, common collector and the second collector are that plate is prepared by graphite or titanium;First electricity Pole material and second electrode material are prepared by one or more of active carbon, carbon fiber, carbon nanotube or graphene Carbon material film;First diaphragm and the second diaphragm are selected from non-woven fabrics, glass fabric, terylene net or Buddhist nun's human relations net.
Embodiment 2
The NaCl solution of 3000mg/L concentration is passed through described in embodiment 1 the from the water tank of 20L using constant flow pump The first diaphragm of upper end of one chamber, and be located at the second diaphragm water outlet measurement conductivity of lower end in second chamber and be converted into Concentration applies the DC voltage of 1.2V between three pieces collector, turns again to initially in concentration when water outlet concentration is stablized It is adsorption cycle when concentration, is at this time shorted collector, it is shown in solid in the concentration situation of change such as Fig. 3 for the treatment of process, Dotted line in Fig. 3 is the conductivity variations curve of the desalination processes of conventional film capacitive deionization film.
Fig. 3 data show that stream oriented device ion concentration after applying applied voltage begins to decline and is raised slowly to initial Value completes adsorption process, and after being shorted to two electrodes, ion concentration is promoted rapidly, the regeneration of electrode is realized, from concentration Situation of change comparison as can be seen that invention dual cavity membrane capacitance deionizer have higher desalting efficiency and Absorption ration.
Embodiment 3
Device in embodiment 1 is simply expanded scale by inventor, has carried out the performance test of multimode group (10 groups): by 10 Group dual cavity membrane capacitance deionizer series connection described in embodiment 1,10 groups of conventional film capacitor deionizing instruments are connected, are utilized Constant flow pump by 1000,2000, the NaCl solution of 3000mg/L concentration pass through 10 groups of dual cavity films electricity respectively from the water tank of 20L Hold deionizer series mould set and conventional film capacitor deionizing instrument series mould set, and measures conductivity in water outlet and turn Concentration is turned to, when water outlet concentration is stablized, applies the DC voltage of 1.2V between three pieces collector, and survey between the modules Try the electric current and voltage in treatment process (for calculating energy consumption);Mould group of the present invention and the processing of conventional film capacitor deionizing instrument are single Position cubic meter NaCl solution to 500mg/L energy consumption comparison such as Fig. 4;Fig. 4 shows that dual cavity membrane capacitance provided by the present invention is gone Ion unit all has absolute energy demand advantages with respect to conventional film capacitor deionizing instrument in each concentration, and ton handles energy consumption difference Are as follows: 0.25,0.49,1.05kWh.
Embodiment 4
Device further expansion module scale in embodiment 1 has been carried out the performance test of multimode group (20 groups) by inventor: 20 groups of dual cavity membrane capacitance deionizers are connected, 20 groups of conventional film capacitor deionizing instruments are connected, it will using constant flow pump The NaCl solution of 3000mg/L concentration passes through 20 groups of dual cavity films with the flow velocity of 20-60ml/min respectively from the water tank of 20L Capacitor deionizing instrument series mould set and 20 groups of conventional film capacitor deionizing instrument series mould sets, and conductance is measured in water outlet Rate is simultaneously converted into concentration, when water outlet concentration stablize in 3000mg/L, between three pieces collector apply continuous current 0.5- 2.5A, to control desalination concentration difference in 500,1000,2000mg/L, and the electric current and electricity during test processes between the modules It presses (for calculating energy consumption), at the desalination of dual cavity membrane capacitance deionizer of the invention and conventional film capacitor deionizing instrument The specific energy consumption (J/mg) and water flux density (μm/s) of reason are as shown in Figure 5;Fig. 5 is shown, as module applies the rising of electric current, module Disposed of in its entirety flux be substantially increased, however, the specific energy consumption handled at the same time also rises with it, realizing certain water flux density Under the premise of, concentration for the treatment of difference increases, and the processing specific energy consumption of module also rises with it;It is obvious that realizing identical concentration difference and water Under the premise of circulation, dual cavity membrane capacitance deionizer provided by the present invention has with respect to conventional film capacitor deionizing instrument There is absolute specific energy consumption advantage.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (8)

1. a kind of dual cavity membrane capacitance deionizer, it is characterised in that: the deionizer is double-cavity structure, the first chamber Water stream channel diaphragm is respectively set in the upper/lower terminal of anion/cation exchange membrane in room and second chamber, makes raw water in dual cavity Serpentine-like flowing in water stream channel diaphragm.
2. dual cavity membrane capacitance deionizer as described in claim 1, it is characterised in that: the first chamber includes up and down The first collector, first electrode material, the first diaphragm, anion/cation exchange membrane, the first diaphragm being cascading, first Electrode material and common collector;The second chamber includes the common collector being cascading up and down, the second electricity Pole material, the second diaphragm, male/female amberplex, the second diaphragm, second electrode material and the second collector.
3. dual cavity membrane capacitance deionizer as claimed in claim 2, it is characterised in that: first collector, described The connection of the positive/negative of common collector and second collector and DC power supply.
4. dual cavity membrane capacitance deionizer as claimed in claim 2, it is characterised in that: first collector, described Common collector and second collector are that plate is prepared by graphite or titanium.
5. dual cavity membrane capacitance deionizer as claimed in claim 2, it is characterised in that: the first electrode material and institute Stating second electrode material is the carbon materials being prepared by one or more of active carbon, carbon fiber, carbon nanotube or graphene Expect film.
6. dual cavity membrane capacitance deionizer as claimed in claim 2, it is characterised in that: first diaphragm and described Two diaphragms are selected from non-woven fabrics, glass fabric, terylene net or Buddhist nun's human relations net.
7. the dual cavity membrane capacitance deionizer as described in claim 2 or 6, it is characterised in that: first diaphragm and Two diaphragms with a thickness of 100-200 μm, consistency is greater than 300 mesh.
8. dual cavity membrane capacitance deionizer as claimed in claim 2, it is characterised in that: further include being arranged described first The securing plate of reinforcement effect is played above chamber and below the second chamber.
CN201811558299.7A 2018-12-19 2018-12-19 Double-chamber membrane capacitance deionization device Active CN109692575B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113087089A (en) * 2021-04-26 2021-07-09 中南大学 Stacked three-dimensional rocking chair type capacitive deionization device and deionization method

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Publication number Priority date Publication date Assignee Title
CN2567203Y (en) * 2002-08-29 2003-08-20 王建友 First-level multi-section electric deion device of water concentration partition plate inserted film pair structure
CN101306855A (en) * 2007-11-07 2008-11-19 傅叶明 Plate type electro-deionization device
CN101337717A (en) * 2008-09-28 2009-01-07 上海纳晶科技有限公司 High efficiency energy-conserving barrier diaphragm capacitance deionization device
TW200942334A (en) * 2008-04-03 2009-10-16 Microjet Technology Co Ltd Fluid transmission device having a plurality of double chamber vibrating structures
CN102249380A (en) * 2011-05-20 2011-11-23 华东师范大学 Efficient liquid flow type membrane capacitance desalter
US20120031763A1 (en) * 2009-04-21 2012-02-09 Tadahiro Ohmi Electrodialyzer
CN104230066A (en) * 2014-10-08 2014-12-24 上海博丹环境工程技术有限公司 Method and system for treatment of high-concentration salt-containing wastewater of valsartan crude product production workshop section

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2567203Y (en) * 2002-08-29 2003-08-20 王建友 First-level multi-section electric deion device of water concentration partition plate inserted film pair structure
CN101306855A (en) * 2007-11-07 2008-11-19 傅叶明 Plate type electro-deionization device
TW200942334A (en) * 2008-04-03 2009-10-16 Microjet Technology Co Ltd Fluid transmission device having a plurality of double chamber vibrating structures
CN101337717A (en) * 2008-09-28 2009-01-07 上海纳晶科技有限公司 High efficiency energy-conserving barrier diaphragm capacitance deionization device
US20120031763A1 (en) * 2009-04-21 2012-02-09 Tadahiro Ohmi Electrodialyzer
CN102249380A (en) * 2011-05-20 2011-11-23 华东师范大学 Efficient liquid flow type membrane capacitance desalter
CN104230066A (en) * 2014-10-08 2014-12-24 上海博丹环境工程技术有限公司 Method and system for treatment of high-concentration salt-containing wastewater of valsartan crude product production workshop section

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113087089A (en) * 2021-04-26 2021-07-09 中南大学 Stacked three-dimensional rocking chair type capacitive deionization device and deionization method

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