CN110510712A - A kind of electrodialysis system and method for bitter desalination - Google Patents
A kind of electrodialysis system and method for bitter desalination Download PDFInfo
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- CN110510712A CN110510712A CN201910734161.6A CN201910734161A CN110510712A CN 110510712 A CN110510712 A CN 110510712A CN 201910734161 A CN201910734161 A CN 201910734161A CN 110510712 A CN110510712 A CN 110510712A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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Abstract
The present invention provides a kind of electrodialysis system and method for bitter desalination, including electrodialytic membranes shut-down system, raw water pump, raw water box, pole liquid pump, pole liquid case and D.C. regulated power supply, electrodialytic membranes shut-down system is that multiple segmented electrodialysis membrane stacks are in turn connected to form, electrodialysis membrane stack is equipped with anode chamber and cathode chamber, yin is provided between anode chamber and cathode chamber, cation-exchange membrane, anode chamber is provided with concentrated water water inlet, fresh water water inlet, anolyte water inlet and anolyte water outlet, cathode chamber is provided with the first water outlet, second water outlet, catholyte water inlet and catholyte water outlet；Electrodialysis membrane stack is configured with D.C. regulated power supply.For typical bitter, System and method for provided by the invention can be not higher than 0.8kWh/m3Desalination water of the ontology energy consumption continuous production TDS between 132-241mg/L, system run all right, and method provided by the invention optimizes brackish water desalination technique, by the adjusting to voltage and current, having achieved the purpose that subtract can lower consumption.
Description
Technical field
The invention belongs to water treatment fields, energy-efficient electrodialysis system and side more particularly, to a kind of bitter desalination
Method.
Background technique
Electrodialysis is a kind of technology combined by electrochemical process with dialysis diffusion process, rather than differential filter type mistake
Journey, therefore, electrodialytic technique contamination resistance are relatively strong, to raw water quality require it is relatively low, be suitable for processing high concentration,
The water body of high salinity.Electrodialytic technique advantages such as few, small investment, easy to automate with its occupied area are widely applied
In terms of concentration salt manufacturing, preferable effect is also achieved in fields such as the aquatic production of application, Industrial Wastewater Treatment and chemical industry.
Electrodialysis is usually used in low concentration brackish water desalination desalination, and the country is frequently with Multistage continuous desalination process, using perseverance
Constant voltage operation desalinates water supply after the electric dialyzator of more single-stages or more plural serial stages, and a desalination reaches pre-provisioning request,
Continuous effluent, salt rejection rate is high, stable, but operating flexibility is small, and in the variation of water supply salt content, adaptability is poor.
In existing electrodialysis desalination technology, there are following general character defects: (1) target of multistage electrodialysis system is more
For common electrode, voltage and current at different levels can not be separately adjustable, since its concentration is material liquid from electrodialysis influent side to water outlet side
Successively decrease step by step, in the case where each step voltage is equal, so that electrodialysis rear class portion voltage is excessive, leads to unnecessary energy
Consumption；(2) electrodialysis is at different levels, section film logarithm is equal, so that linear flow in the single compartment of electrodialysis prime and rear class, leading portion and back segment
Speed is equal, but rear stage or latter section of desalination water concentration are lower with respect to previous stage or the last period, therefore next stage carrying current
Density is reduced with respect to the former, is prone to polarization phenomena, current efficiency decline in freshwater room；(3) in conventional bitter electrodialysis
In the process, the solution resistance of electrode chamber still occupies certain proportion, thus can generate considerable amount of pole room energy consumption.
Therefore, there is an urgent need to develop a kind of novel electricity-saving electrodialysis desalination systems and method, adjust corresponding each step voltage
And ontology energy consumption is preferably minimized by electric current under the premise of reaching target producing water water quality.
Summary of the invention
It is an object of the invention to overcome the shortcomings of existing electrodialysis desalination technology, a kind of energy-saving multistage multistage electricity is provided
The continuous desalination system of dialysis solves reverse osmosis and conventional electrodialytic technique for desalting efficiency present in bitter desalination processes
It is low, energy consumption is high, longtime running stability is it is still necessary to be promoted, promote bitter electrodialysis desalination application in subtracting and can lower consumption.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: including electrodialytic membranes shut-down system, raw water pump,
Raw water box, pole liquid pump, pole liquid case and D.C. regulated power supply, the electrodialytic membranes shut-down system be multiple segmented electrodialysis membrane stacks according to
Secondary connection is formed, and the electrodialysis membrane stack is equipped with anode chamber and cathode chamber, be provided between the anode chamber and cathode chamber yin,
Cation-exchange membrane, the anode chamber are provided with concentrated water water inlet, fresh water water inlet, anolyte water inlet and anolyte water outlet
Mouthful, the cathode chamber is provided with the first water outlet, the second water outlet, catholyte water inlet and catholyte water outlet；The raw water
The water outlet of case is divided into two water flows, the respectively first water outlet and the second water outlet, and first water outlet and the second water outlet are separately connected
To the concentrated water water inlet and fresh water water inlet in the electrodialytic membranes shut-down system, first water outlet connects outer discharge pipe, institute
State the second water outlet connection water user pipe；The water outlet of the pole liquid case is divided into two pole liquid streams, respectively anolyte and cathode
Liquid, the anolyte and catholyte are connected respectively to anolyte water inlet and catholyte water inlet, the yin by pole liquid pipe road
Pole liquid water outlet connects pole liquid case by pipeline with anolyte water outlet；The electrodialysis membrane stack is configured with D.C. regulated power supply.
Further, the pole room of the electrodialysis membrane stack is made of resin packed bed type ultrathin electrodes sheet frame；The resin
Packed bed type ultrathin electrodes sheet frame includes resin packed bed ultra-thin anode sheet frame and resin packed bed ultra thin cathode sheet frame, the sun
Pole room and cathode chamber are made of resin packed bed ultra-thin anode sheet frame and resin packed bed ultra thin cathode sheet frame respectively；The resin
Packed bed ultra-thin anode sheet frame and resin packed bed ultra thin cathode sheet frame include electrode plate and pole frame, the resin packed bed type
Ultrathin electrodes sheet frame is the strong acid and strong base mixed bed yin of 1:1 filled with volume ratio with a thickness of 1-3mm, and between electrode plate and pole frame
Cation exchange resin.
Further, the electrodialytic membranes shut-down system is in turn connected to form by three segmented electrodialysis membrane stacks, respectively
First order electrodialysis membrane stack, second level electrodialysis membrane stack and third level electrodialysis membrane stack；Wherein, the first order electrodialysis membrane stack
In electrode sheet frame with a thickness of 1-3mm；Electrode sheet frame in the second level electrodialysis membrane stack is with a thickness of 1-3mm；The third
Electrode sheet frame in grade electrodialysis membrane stack is with a thickness of 1-3mm.
Further, the electrodialysis membrane stack is designed using asymmetric membrane logarithm between level segment, non-between the level segment
Symmetry film logarithm includes asymmetric membrane logarithm between asymmetric membrane logarithm and each section between grade；Asymmetric membrane pair between the grade
The membrane stacks at different levels of number design, wherein every level-one membrane stack unit uses different film logarithms, total film logarithm is based on 360 pairs.
Further, the film logarithm in the first order electrodialysis membrane stack is 120-160 pairs；The second level electrodialytic membranes
Film logarithm in heap is 100-140 pairs；Film logarithm in the third level electrodialysis membrane stack is 80-120 pairs.
Further, the electrodialysis membrane stacks at different levels that asymmetric membrane logarithm designs between described each section, every level-one electrodialysis
Membrane stack is provided with a commutation partition, and the film logarithm before the commutation partition is more than the film logarithm after commutation partition；
And the film logarithm ratio of the commutation partition two sides is between 1-1.3.
It further, is non-common electrode connection between membrane stacks at different levels, electrodialysis membrane stack described in every level-one is each equipped with one directly
Flow regulated power supply；The first order electrodialysis membrane stack, second level electrodialysis membrane stack and third level electrodialysis membrane stack are separately connected
Level-one D.C. regulated power supply, second level D.C. regulated power supply and third level D.C. regulated power supply；The first order electrodialysis membrane stack
Cathode plate and second level electrodialysis membrane stack anode plate between be provided with a thickness of the insulation board of 3,5,7,9 or 10mm；It is described
Be provided between the cathode plate of second level electrodialysis membrane stack and the anode plate of third level electrodialysis membrane stack with a thickness of 3,5,7,9 or
The insulation board of 10mm.
A kind of energy-efficient electrodialysis methods for bitter desalination, the method is using anodic-cathodic liquid cocurrent and dense
Fresh water adverse current means are formed by the multistage multisection type system integration and optimization of Independent adjustables at different levels towards brackish water desalination
Continous way energy conservation electrodialytic technique；The anodic-cathodic liquid cocurrent is that the anode and cathode liquid of its every level-one conveys the anode chamber and the cathode chamber respectively,
To not mutual crossfire；The deep or light water adverse current, the deep or light water inlet of membrane stacks at different levels is located at respective membrane stack two sides, so that membrane stack is dense
Room liquid stream and light room liquid stream reverse flow each other, the specific implementation steps are as follows:
Step 1: opening the pole liquid pump, then the electrode solution in the pole liquid case is delivered to every level-one via pole liquid pump respectively
In the cathode chamber and anode chamber of the electrodialysis membrane stack, the electrode solution simultaneously recycles extremely liquid after each pole room exit is converged
Case；
Step 2: opening the raw water pump, then the raw water in raw water box is divided into two water flow water outlets, and via raw water pump point
It is not delivered to concentrated water water inlet and fresh water water inlet, and then is flowed into first order electrodialysis membrane stack；In flow process,
The concentrated water entered by the first water outlet of upper level electrodialysis membrane stack in the concentrated water water inlet of next stage electrodialysis membrane stack after
Continue and flowed in next stage electrodialysis membrane stack, the fresh water enters next stage by the second water outlet of upper level electrodialysis membrane stack
Continue to flow in next stage electrodialysis membrane stack in the fresh water water inlet of electrodialysis membrane stack, wherein the last period of membrane stacks at different levels is dense
Water flows from above to below, fresh water flows from bottom to top, and through the spacer function that commutates, the second segment concentrated water of membrane stacks at different levels flows from bottom to top
Dynamic, fresh water flows from above to below；The membrane stack of electrodialysis described in afterbody, that is, third level electrodialysis membrane stack concentrated water goes out via first
Mouth of a river device for transferring, fresh water pass through pipeline connection with water user via the second water outlet；
Step 3: in the operational process of step 2, adjusting the D.C. regulated power supply that every level-one electrodialytic membranes heap is connected
Voltage and current is realized that electrodialysis membrane stack voltage and currents at different levels are separately adjustable, the ontology energy consumption of operation is further decreased with this.
The advantages and positive effects of the present invention are:
1, the present invention is connected using non-common electrode, and the electrodialysis membrane stack of every level-one is controlled by a D.C. regulated power supply
System can be adjusted at any time its voltage and current according to the variation of the concentration of the material liquid of every level-one, by rationally adjusting electrodialytic membranes at different levels
The voltage and current of heap can further decrease the ontology energy consumption of the desalination system under the conditions of guaranteeing a certain range salt rejection rate.
2, electrodialysis membrane stack at different levels provided by the invention, electrode chamber thickness are not more than 3mm, and mold difficulty is small, is easy to big
Technical scale metaplasia produces；Anisotropic membrane logarithm design between each section is able to ascend the crossflow velocity of latter section of deep or light room, to drop
Low latter section of concentration difference diffusion and concentration polarization, and then reduce the operation energy consumption of entire membrane stack；Entire electricity-saving electrodialysis desalination system
Producing water water quality can carry out mobility adjusting, simple to operate, operation stability is high.
3, the electrodialysis system of bitter desalination proposed by the present invention can be not higher than 0.8kWh/m3Ontology energy consumption connect
Continuous production desalination water, desalination water water quality are motor-driven adjustable (TDS is between 132-241mg/L).
Detailed description of the invention
Fig. 1 is the structure of electrodialytic membranes shut-down system in a kind of electrodialysis system and method for bitter desalination of the present invention
Schematic diagram；
Fig. 2 is that the present invention is a kind of for the electrodialysis system of bitter desalination and the methods experiment flow chart of method；
In figure: 1- resin packed bed ultra-thin anode sheet frame, 2- anions and canons exchange membrane, 3- commutation partition, the filling of 4- resin
Bed ultra thin cathode sheet frame, 5- insulation board, 6- first order electrodialysis membrane stack, the second level 7- electrodialysis membrane stack, the pole electrodialysis of 8- third
Membrane stack, 9- raw water box, 10- concentrated water water inlet, 11- fresh water water inlet, 13- first order D.C. regulated power supply, the second level 14- direct current
Regulated power supply, 15- third level D.C. regulated power supply, 16- anolyte water inlet, 17- catholyte water inlet, the water outlet of 18- anolyte
Mouthful, 19- catholyte water outlet, the first water outlet of 20-, the second water outlet of 21-, the pole 22- liquid case, the pole 23- liquid pump, 24- raw water pump.
Specific embodiment
It elaborates with reference to the accompanying drawing to a specific embodiment of the invention.
As shown in Figure 1 and Figure 2, a kind of electrodialysis system for bitter desalination, including electrodialytic membranes shut-down system, raw water
Pump 24, raw water box 9, pole liquid pump 23, pole liquid case 22 and D.C. regulated power supply, which is characterized in that the electrodialytic membranes shut-down system is
Multiple segmented electrodialysis membrane stacks are in turn connected to form, and the electrodialysis membrane stack is equipped with anode chamber and cathode chamber, the anode
Anions and canons exchange membrane 2 is provided between room and cathode chamber, the anode chamber is provided with concentrated water water inlet 10, fresh water water inlet
11, anolyte water inlet 16 and anolyte water outlet 18, the cathode chamber be provided with the first water outlet 20, the second water outlet 21,
Catholyte water inlet 17 and catholyte water outlet 19；The water outlet of the raw water box 9 is divided into two water flows, the respectively first water outlet and
Second water outlet, 10 He of concentrated water water inlet that first water outlet and the second water outlet are connected respectively in the electrodialytic membranes shut-down system
Fresh water water inlet 11, first water outlet 20 connect outer discharge pipe, and second water outlet 21 connects water user pipe；It is described
The water outlet of pole liquid case 22 is divided into two pole liquid streams, respectively anolyte and catholyte, and the anolyte and catholyte pass through pole liquid
Pipeline is connected respectively to anolyte water inlet 16 and catholyte water inlet 17, the catholyte water outlet 19 and anolyte water outlet
18 connect pole liquid case 22 by pipeline；The electrodialysis membrane stack is configured with D.C. regulated power supply.The wherein yin, yang in pole liquid case 22
Pole liquid is respectively delivered to yin, yang pole room by pipeline under the action of pole liquid pump 23, and the raw water in raw water box 9 is divided into two strands and goes out
Water, and anode chamber is transported to by concentrated water water inlet 10 and fresh water water inlet 11 respectively by pipeline under the action of raw water pump 24
It is interior.
Further, the pole room of the electrodialysis membrane stack is made of resin packed bed type ultrathin electrodes sheet frame；The resin
Packed bed type ultrathin electrodes sheet frame includes resin packed bed ultra-thin anode sheet frame 1 and resin packed bed ultra thin cathode sheet frame 4, described
Anode chamber and cathode chamber are made of resin packed bed ultra-thin anode sheet frame 1 and resin packed bed ultra thin cathode sheet frame 4 respectively；It is described
Resin packed bed ultra-thin anode sheet frame 1 and resin packed bed ultra thin cathode sheet frame 4 include electrode plate and pole frame, the resin filling
Bed-type ultrathin electrodes sheet frame mixes between electrode plate and pole frame filled with the strong acid and strong base that volume ratio is 1:1 with a thickness of 1-3mm
Bed anion-cation exchange resin.The anolyte water inlet 16, anolyte water outlet 18, catholyte water inlet 17 and catholyte go out
The mouth of a river 19 is provided with the moisturizing slot that moisturizing gap width is 0.1/0.2/0.3/0.4 or 0.5mm, and between adjacent moisturizing gap
Away from for 2.0/2.2/2.4/2.6/2.8 or 3.0mm, meanwhile, electrode plate is lower than pole frame 1.0/2.0 or 3.0mm so that resin is filled out
It fills.
Further, the electrodialytic membranes shut-down system is in turn connected to form by three segmented electrodialysis membrane stacks, respectively
First order electrodialysis membrane stack 6, second level electrodialysis membrane stack 7 and third level electrodialysis membrane stack 8；Wherein, the first order electrodialysis
Electrode sheet frame in membrane stack 6 is with a thickness of 1-3mm；Electrode sheet frame in the second level electrodialysis membrane stack 7 is with a thickness of 1-3mm；Institute
The electrode sheet frame in third level electrodialysis membrane stack 8 is stated with a thickness of 1-3mm.
Further, the electrodialysis membrane stack is designed using asymmetric membrane logarithm between level segment, non-between the level segment
Symmetry film logarithm includes asymmetric membrane logarithm between asymmetric membrane logarithm and each section between grade；Asymmetric membrane pair between the grade
The membrane stacks at different levels of number design, wherein every level-one membrane stack unit uses different film logarithms, total film logarithm is based on 360 pairs；Described
Film logarithm in level-one electrodialysis membrane stack 6 is 120-160 pairs；Film logarithm in the second level electrodialysis membrane stack 7 is 100-140
It is right；Film logarithm in the third level electrodialysis membrane stack 8 is 80-120 pairs.
Further, the electrodialysis membrane stacks at different levels that asymmetric membrane logarithm designs between described each section, every level-one electrodialysis
Membrane stack is provided with a commutation partition 3, and the film logarithm before the commutation partition 3 is more than the film pair after commutation partition
Number；And the film logarithm ratio for 3 two sides of partition of commutating is between 1-1.3.
It further, is non-common electrode connection between membrane stacks at different levels, and electrodialysis membrane stack described in every level-one is each equipped with one
D.C. regulated power supply；The first order electrodialysis membrane stack 6, second level electrodialysis membrane stack 7 and third level electrodialysis membrane stack 8 connect respectively
Connect first order D.C. regulated power supply 13, second level D.C. regulated power supply 14 and third level D.C. regulated power supply 15；The first order
It is provided between the cathode plate of electrodialysis membrane stack 6 and the anode plate of second level electrodialysis membrane stack 7 with a thickness of 3,5,7,9 or 10mm's
Insulation board 5；Thickness is provided between the cathode plate of the second level electrodialysis membrane stack 7 and the anode plate of third level electrodialysis membrane stack 8
Degree is the insulation board 5 of 3,5,7,9 or 10mm.
A kind of energy-efficient electrodialysis methods for bitter desalination, the method is using anodic-cathodic liquid cocurrent and dense
Fresh water adverse current means are formed by the multistage multisection type system integration and optimization of Independent adjustables at different levels towards brackish water desalination
Continous way energy conservation electrodialytic technique；The anodic-cathodic liquid cocurrent is that the anode and cathode liquid of its every level-one conveys the anode chamber and the cathode chamber respectively,
To not mutual crossfire；The deep or light water adverse current, the deep or light water inlet of membrane stacks at different levels is located at respective membrane stack two sides, so that membrane stack is dense
Room liquid stream and light room liquid stream reverse flow each other, the specific implementation steps are as follows:
Step 1: opening pole liquid pump 23, then the electrode solution in the pole liquid case 22 is delivered to each respectively via pole liquid pump 23
In the cathode chamber and anode chamber of the grade electrodialysis membrane stack, the electrode solution simultaneously recycles extremely liquid after each pole room exit is converged
Case 22；
Step 2: opening raw water pump 24, then the raw water in raw water box 9 is divided into two water flow water outlets, and divides via raw water pump 24
It is not delivered to concentrated water water inlet 10 and fresh water water inlet 11, and then is flowed into first order electrodialysis membrane stack 6；It is flowing over
Cheng Zhong, the concentrated water are intake by the concentrated water that the first water outlet 21 of upper level electrodialysis membrane stack enters next stage electrodialysis membrane stack
Continue to flow in next stage electrodialysis membrane stack in mouthfuls 10, the fresh water by upper level electrodialysis membrane stack the second water outlet 22 into
Enter into the fresh water water inlet 11 of next stage electrodialysis membrane stack to continue to flow in next stage electrodialysis membrane stack, wherein films at different levels
The last period concentrated water of heap flows from above to below, fresh water flows from bottom to top, and through the spacer function that commutates, the second segment of membrane stacks at different levels is dense
Water flows from bottom to top, fresh water flows from above to below；The membrane stack of electrodialysis described in afterbody, that is, third level electrodialysis membrane stack 8 is dense
Water passes through pipeline connection with water user via the second water outlet 22 via 21 device for transferring of the first water outlet, fresh water；
Step 3: in the operational process of step 2, adjusting the D.C. regulated power supply that every level-one electrodialytic membranes heap is connected
Voltage and current is realized that electrodialysis membrane stack voltage and currents at different levels are separately adjustable, the ontology energy consumption of operation is further decreased with this.
The following are carry out desalination using seawater nanofiltration water of the above-described electrodialysis system to typical bitter water quality
Experiment:
Embodiment 1:
Wherein, in electrodialysis membrane stack commutate partition 3 with a thickness of 0.9mm, electrode plate 3mm low compared with pole frame, the width of cloth sink
Degree is 6mm, and moisturizing gap width is 0.3mm, and the spacing in adjacent moisturizing gap is 2.6mm；By anion and cation exchange resin
1:1 is sufficiently mixed uniformly by volume, and hygrometric state is filled to electrode chamber, and electrode chamber thickness is 3mm；Amberplex membrane area
For 400*800mm, effective membrane area is 340*620mm；The film logarithm of electrodialysis system amounts to 360 pairs, three-stage electrodialysis membrane stack
Film logarithm to set gradually be 140 pairs, 120 pairs and 100 pairs, latter section of film logarithm of same membrane stack reduces 7% compared with the last period.Tool
Body operating parameter and Inlet and outlet water water quality are as shown in table 1 below:
The operating parameter and water-in and water-out water quality 1 of 1 embodiment 1 of table
Specifically, in this embodiment, electrodialysis water yield is 18L/min, i.e. 1.08t/h, produce water conductivity down to
187 μ S/cm, TDS are down to 132.6mg/L, and for salt rejection rate 95% or more, ton water consume electricity is 0.759KWh/m3。
On the basis of embodiment 1, by adjusting each step voltage or electric current, embodiment 2 can be obtained, concrete operations parameter and
Inlet and outlet water water quality is as shown in table 2 below:
Embodiment 2
The operating parameter and water-in and water-out water quality 2 of 2 embodiment 2 of table
By suitably reducing operating voltages at different levels, the electric current of electrodialysis desalination system, fresh water conductivity in this test
410 μ S/cm, TDS 241mg/L, salt rejection rate still can reach 90% or more, and ton water consume electricity is reduced to 0.52KWh/m3；With reality
It applies example 1 to compare, the flow of inlet water of embodiment 2 is identical as pressure, the conductivity of water inlet is identical, only appropriate adjustment electrodialytic membranes at different levels
The voltage and current of heap, salt rejection rate still can reach 90% or more, and save 0.25KWh/ compared with the ton water consume electricity in embodiment 1
m3。
Obviously, by reasonably adjusting the voltage and current of electrodialysis membrane stacks at different levels, under the conditions of guaranteeing a certain range salt rejection rate,
The ontology energy consumption of the desalination system can be further decreased.
Electrodialysis membrane stack at different levels provided by the invention, electrode chamber thickness are not more than 3mm, and mold difficulty is small, is easy to advise greatly
Mould industrialized production；The producing water water quality of entire electricity-saving electrodialysis desalination system can carry out mobility adjustment, simple to operate, fortune
Row stability is high.
By the operation and comparison of above embodiments, the present invention can be achieved it is following the utility model has the advantages that
1, the present invention is connected using non-common electrode, and the electrodialysis membrane stack of every level-one is controlled by a D.C. regulated power supply
System can be adjusted at any time its voltage and current according to the variation of the concentration of the material liquid of every level-one, by rationally adjusting electrodialytic membranes at different levels
The voltage and current of heap can further decrease the ontology energy consumption of the desalination system under the conditions of guaranteeing a certain range salt rejection rate.
2, electrodialysis membrane stack at different levels provided by the invention, electrode chamber thickness are not more than 3mm, and mold difficulty is small, is easy to big
Technical scale metaplasia produces；Anisotropic membrane logarithm design between each section is able to ascend the crossflow velocity of latter section of deep or light room, to drop
Low latter section of concentration difference diffusion and concentration polarization, and then reduce the operation energy consumption of entire membrane stack；Entire electricity-saving electrodialysis desalination system
Producing water water quality can carry out mobility adjusting, simple to operate, operation stability is high.
3, the electrodialysis system of bitter desalination proposed by the present invention can be not higher than 0.8kWh/m3Ontology energy consumption connect
Continuous production desalination water, desalination water water quality are motor-driven adjustable (TDS is between 132-241mg/L).
Above two embodiments of the present invention are described in detail, but the content is only preferable implementation of the invention
Example, should not be considered as limiting the scope of the invention.It is all according to all the changes and improvements made by the present patent application range
Deng should still be within the scope of the patent of the present invention.
Claims (8)
1. a kind of electrodialysis system for bitter desalination, including electrodialytic membranes shut-down system, raw water pump (24), raw water box (9),
Pole liquid pump (23), pole liquid case (22) and D.C. regulated power supply, which is characterized in that the electrodialytic membranes shut-down system is multiple segmenteds
Electrodialysis membrane stack is in turn connected to form, and the electrodialysis membrane stack is equipped with anode chamber and cathode chamber, the anode chamber and cathode chamber
Between be provided with anions and canons exchange membrane (2), the anode chamber be provided with concentrated water water inlet (10), fresh water water inlet (11), sun
Pole liquid water inlet (16) and anolyte water outlet (18), the cathode chamber are provided with the first water outlet (20), the second water outlet
(21), catholyte water inlet (17) and catholyte water outlet (19)；The water outlet of the raw water box (9) is divided into two water flows, respectively
For the first water outlet and the second water outlet, first water outlet and the second water outlet are connected respectively to dense in the electrodialytic membranes shut-down system
Water water inlet (10) and fresh water water inlet (11), first water outlet (20) connect outer discharge pipe, second water outlet
(21) water user pipe is connected；The water outlet of the pole liquid case (22) is divided into two pole liquid streams, respectively anolyte and catholyte, institute
It states anolyte and catholyte and anolyte water inlet (16) and catholyte water inlet (17) is connected respectively to by pole liquid pipe road, it is described
Catholyte water outlet (19) connects pole liquid case (22) by pipeline with anolyte water outlet (18)；The electrodialysis membrane stack is configured with
D.C. regulated power supply.
2. a kind of electrodialysis system for bitter desalination according to claim 1, which is characterized in that the electrodialysis
The pole room of membrane stack is made of resin packed bed type ultrathin electrodes sheet frame；The resin packed bed type ultrathin electrodes sheet frame includes resin
Packed bed ultra-thin anode sheet frame (1) and resin packed bed ultra thin cathode sheet frame (4), the anode chamber and cathode chamber are respectively by resin
Packed bed ultra-thin anode sheet frame (1) and resin packed bed ultra thin cathode sheet frame (4) are made；The resin packed bed ultra-thin anode plate
Frame (1) and resin packed bed ultra thin cathode sheet frame (4) include electrode plate and pole frame, the resin packed bed type ultrathin electrodes plate
Frame is with a thickness of 1-3mm, and the strong acid and strong base mixed bed cation and anion exchange for being 1:1 filled with volume ratio between electrode plate and pole frame
Resin.
3. a kind of electrodialysis system for bitter desalination according to claim 2, which is characterized in that the electrodialysis
Membrane stack system is in turn connected to form by three segmented electrodialysis membrane stacks, respectively first order electrodialysis membrane stack (6), second level electricity
Dialysis membrane stack (7) and third level electrodialysis membrane stack (8)；Wherein, the electrode sheet frame thickness in the first order electrodialysis membrane stack (6)
For 1-3mm；Electrode sheet frame in the second level electrodialysis membrane stack (7) is with a thickness of 1-3mm；The third level electrodialysis membrane stack
(8) the electrode sheet frame in is with a thickness of 1-3mm.
4. a kind of electrodialysis system for bitter desalination according to claim 3, which is characterized in that the electrodialysis
Membrane stack uses asymmetric membrane logarithm between level segment to be designed, and asymmetric membrane logarithm includes asymmetry between grade between the level segment
Asymmetric membrane logarithm between film logarithm and each section；The membrane stacks at different levels that asymmetric membrane logarithm designs between the grade, wherein every level-one
Membrane stack unit uses different film logarithms, and total film logarithm is based on 360 pairs.
5. a kind of electrodialysis system for bitter desalination according to claim 4, which is characterized in that the first order
Film logarithm in electrodialysis membrane stack (6) is 120-160 pairs；
Film logarithm in the second level electrodialysis membrane stack (7) is 100-140 pairs；
Film logarithm in the third level electrodialysis membrane stack (8) is 80-120 pairs.
6. a kind of electrodialysis system for bitter desalination according to claim 4, which is characterized in that between described each section
The electrodialysis membrane stacks at different levels of asymmetric membrane logarithm design, every level-one electrodialytic membranes heap are provided with a commutation partition (3),
Film logarithm before its described commutation partition (3) is more than the film logarithm after commutation partition；And described commutation partition (3) two sides
Film logarithm ratio is between 1-1.3.
7. a kind of electrodialysis system for bitter desalination according to claim 3, which is characterized in that between membrane stacks at different levels
It is connected for non-common electrode, electrodialysis membrane stack described in every level-one is each equipped with a D.C. regulated power supply；
The first order electrodialysis membrane stack (6), second level electrodialysis membrane stack (7) and third level electrodialysis membrane stack (8) are separately connected
First order D.C. regulated power supply (13), second level D.C. regulated power supply (14) and third level D.C. regulated power supply (15)；
Thickness is provided between the cathode plate of the first order electrodialysis membrane stack (6) and the anode plate of second level electrodialysis membrane stack (7)
Degree is the insulation board (5) of 3,5,7,9 or 10mm；
Thickness is provided between the cathode plate of the second level electrodialysis membrane stack (7) and the anode plate of third level electrodialysis membrane stack (8)
Degree is the insulation board (5) of 3,5,7,9 or 10mm.
8. a kind of energy-efficient electrodialysis methods for bitter desalination, use such as claims 1 to 7 described in any item one
Kind is used for the electrodialysis system of bitter desalination, which is characterized in that the method is inverse using anodic-cathodic liquid cocurrent and deep or light water
Stream means are formed by the multistage multisection type system integration and optimization of electrodialysis membrane stack voltage Independent adjustables at different levels towards bitter salty
The continous way energy conservation electrodialytic technique of water desalination；The anodic-cathodic liquid cocurrent is that the anode and cathode liquid of its every level-one conveys yin respectively
Anode chamber, thus not mutual crossfire；The deep or light water adverse current, the deep or light water inlet of membrane stacks at different levels are located at respective membrane stack two sides, make
The dense room liquid stream of membrane stack and light room liquid stream reverse flow each other are obtained, the specific implementation steps are as follows:
Step 1: opening the pole liquid pump 23, then the electrode solution in the pole liquid case 22 is delivered to each respectively via pole liquid pump 23
In the cathode chamber and anode chamber of the grade electrodialysis membrane stack, the electrode solution simultaneously recycles extremely liquid after each pole room exit is converged
Case 22；
Step 2: opening raw water pump 24, then the raw water in raw water box 9 is divided into the water outlet of two water flows, and distinguishes via raw water pump 24 defeated
It send to concentrated water water inlet 10 and fresh water water inlet 11, and then is flowed into first order electrodialysis membrane stack 6；In flow process
In, the concentrated water is entered the concentrated water water inlet of next stage electrodialysis membrane stack by the first water outlet 21 of upper level electrodialysis membrane stack
Continue to flow in next stage electrodialysis membrane stack in 10, the fresh water is entered by the second water outlet 22 of upper level electrodialysis membrane stack
Continue to flow in next stage electrodialysis membrane stack in the fresh water water inlet 11 of next stage electrodialysis membrane stack, wherein membrane stacks at different levels
The last period concentrated water flow from above to below, fresh water flows from bottom to top, through commutate spacer function, the second segment concentrated water of membrane stacks at different levels
Flowing, fresh water flow from above to below from bottom to top；The membrane stack of electrodialysis described in afterbody, that is, third level electrodialysis membrane stack 8 concentrated water
Via 21 device for transferring of the first water outlet, fresh water passes through pipeline connection with water user via the second water outlet 22；
Step 3: in the operational process of step 2, adjusting the voltage for the D.C. regulated power supply that every level-one electrodialytic membranes heap is connected
And electric current, it realizes that electrodialysis membrane stack voltage and currents at different levels are separately adjustable, the ontology energy consumption of operation is further decreased with this.
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