CN105060575B - A kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater - Google Patents
A kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater Download PDFInfo
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- CN105060575B CN105060575B CN201510439862.9A CN201510439862A CN105060575B CN 105060575 B CN105060575 B CN 105060575B CN 201510439862 A CN201510439862 A CN 201510439862A CN 105060575 B CN105060575 B CN 105060575B
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- 238000000909 electrodialysis Methods 0.000 title claims abstract description 101
- 239000013535 sea water Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000011033 desalting Methods 0.000 title claims abstract description 11
- 230000008878 coupling Effects 0.000 title claims abstract description 9
- 238000010168 coupling process Methods 0.000 title claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000010612 desalination reaction Methods 0.000 claims abstract description 54
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 12
- 239000012528 membrane Substances 0.000 claims description 26
- 150000003839 salts Chemical class 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000007865 diluting Methods 0.000 claims description 14
- 150000001875 compounds Chemical class 0.000 claims description 12
- 238000004132 cross linking Methods 0.000 claims description 12
- 239000003014 ion exchange membrane Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 7
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 241000894006 Bacteria Species 0.000 claims description 4
- 239000003011 anion exchange membrane Substances 0.000 claims description 4
- 239000007832 Na2SO4 Substances 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 230000035699 permeability Effects 0.000 claims 1
- 229910052707 ruthenium Inorganic materials 0.000 claims 1
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 5
- 238000000502 dialysis Methods 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 description 9
- 238000001223 reverse osmosis Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention belongs to sea water desalination dialysis fields, for the disadvantages of electrodialytic desalination process energy consumption is high, concentrated water is difficult, a kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater are designed and developed, it will achieve the purpose that concentrated water zero-emission, high efficient utilization of water resources, occupied area is small, integrated operation expense is low, economic and social profit is good with technological designs such as ultrafiltration pretreatment, electrodialysis desalination, anti-electrodialysis power generations in the method；It is an advantage of the invention that occupied area is small, operating cost is low, concentrated water realizes that zero-emission, economy and social benefit are good substantially.The present invention can be widely applied in seawater desalinization enterprise and resident.
Description
Technical field
The invention belongs to sea water desalination dialysis fields, and in particular to a kind of anti-electrodialysis of coupling and electrodialytic sea water desalination
Method.
Background technique
China is the country that freshwater resources lack, increment technique of the sea water desalination as freshwater resources, it has also become solves water
The strategic selection of shortage of resources.From after the 1980s, with mentioning for reverse osmosis membrane performance and energy recycle device efficiency
Height, large reverse osmosis sea water desalination energy consumption are reduced between 3~5kWh/t, and with low investment, occupied area is small, the construction period is short
Etc. advantages gradually instead of thermal method desalination technology, occupy the market share in Chinese 2/3 or more sea water desalination market, become
The desalination technology of mainstream at present.But while solving freshwater resources supply problem, expose many shortcomings: energy
Amount recyclable device is expensive, operating pressure of counter-infiltration system is up to 5~8MPa, pipeline is steel material and perishable, equipment
It is at high cost, reverse osmosis membrane service life is short, equipment noise is larger (90 decibels of >).In recent years, continuous with electrodialytic technique
Progress, electrodialytic desalination technology are gradually improved maturation.Although electrodialytic desalination equipment is in cost, maintenance, corrosion-resistant
Property, service life etc. there is apparent advantage, but large-scale electrodialytic desalination fortune compared with reverse osmosis membrane sea water desalination
Row energy consumption (10~12kWh/t) is higher compared with large reverse osmosis sea water desalination (3~5kWh/t).Reverse osmosis and electric osmose simultaneously
Analysis sea water desalination all has concentrated water intractable problem, if direct emission enters sea and can cause one to the hydrological environment in discharge sea area again
Fixed destruction.
It is looked into newly by technology, the current country is mainly thermal method, reverse osmosis, electrodialysis etc. to the method for sea water desalination.But by
It is higher in traditional thermal method process energy consumption, a large amount of fossil energy can be consumed in desalting process, and China's environment is caused sternly
The destruction of weight.Meanwhile all there is the problems such as concentrated water is difficult in reverse osmosis and electrodialysis, while reverse osmosis in desalting process
There is many shortcomings in actual application in method.And pass through the connection of the anti-electric dialyzator of self assembly and electric dialyzator
With seawater being entered electric dialyzator according to a certain percentage, concentrated water that anti-electric dialyzator is generated using electrodialytic desalination and former
Salinity difference between seawater, which carries out salt error, to generate electricity.The final basic water rate of recovery for realizing sea water desalination 75%, whole energy consumption with
Simple electrodialysis is compared to the purpose for reducing about 45% and concentrated water zero-emission.
With domestic shortage of water resources get worse and the enhancing of environmental consciousness, country will be more next to energy-saving and emission-reduction
More pay attention to.China's sea water desalination share cumulative year after year, while embrane method concentrated water discharge problem is also increasingly serious, if not light in seawater
It is broken through on chemical industry skill and concentrated water processing technique, it will cause the continuous worsening of China's environment and body of sea water, therefore to from group
The research of the sea water desalination of anti-loaded electric dialyzator and electric dialyzator has great importance and necessity.
Summary of the invention
The present invention be directed to electrodialytic desalination process energy consumptions it is high, concentrated water is difficult the disadvantages of, designed and developed one kind
Couple anti-electrodialysis and electrodialytic method for desalting seawater.It in the method will be with ultrafiltration pretreatment, electrodialysis desalination, anti-electricity
Dialysis power generation etc. technological designs, reach concentrated water zero-emission, high efficient utilization of water resources, occupied area is small, integrated operation expense is low, warp
Ji and the good purpose of social benefit.
The present invention adopts the following technical scheme that as follows:
A kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater, the described method comprises the following steps:
(1) original seawater is squeezed into ultrafiltration pretreatment device by centrifugal pump, removes suspended matter in original seawater and thin
The pollutants such as bacterium squeeze into electrodialysis by 1: 1,1: 2,1: 3 volume ratio for centrifugal pump is passed through respectively by pretreated seawater
Deep or light room；
(2) after pretreated seawater enters electrodialysis plant, compound concentration is the Na of 0.2~0.3mol/L2SO4Pole room
Solution, by Na2SO4Pole room is squeezed into through centrifugal pump, deep or light room is controlled and pole room flow velocity is 100~300L/h；
(3) the current density control in electrodialysis plant is 200~400A/m2, through recycling desalination, until electrodialysis plant
When production water conductivity in diluting compartment outlet is reduced to 500~800 μ s/cm, it is passed through production water pot.
(4) enriched chamber's production water after above-mentioned electrodialytic desalination is squeezed into the desalination of anti-electrodialysis plant through centrifugal pump
Room, pretreated seawater are passed through the dense room of anti-electrodialysis, and compound concentration is the FeCl of 0.2mol/L3With FeCl2Pole room mixing it is molten
Liquid squeezes into anti-electrodialysis pole room through centrifugal pump, and the deep or light room in anti-electrodialysis plant and pole room flow control are 150~250L/
H is circulated in the device, until the outlet of anti-electrodialysis plant diluting compartment is with the salt content that the outlet of dense room mixes production water
3.0wt%~4.0wt%, electric energy caused by anti-electrodialysis is through power transformation device directly for electrodialytic desalination electricity consumption.
Further, the film that electrodialysis plant uses is homogeneous ion-exchange membrane, and film resistance is 1~4 Ω/cm2, the degree of cross linking
It is 75%~90%, soda acid pH tolerant is 2~13.
Further, the film that anti-electrodialysis plant uses is homogeneous ion-exchange membrane, and film resistance is 0.8~1.6 Ω/cm2,
The degree of cross linking be 80%~95%, soda acid be resistant to pH be 2~12, electrode two sides use monovalent anion exchange membrane, film resistance be 1~
3Ω/cm2, the selective penetrated property of film is greater than 97%.
Further, anti-electrodialysis uses membrane stack 400*800 millimeters of type membrane stack, and it is equal that membrane stack is provided with 150~200 pairs of special types
Phase amberplex.
Further, the pretreated seawater pH value is 7.6~7.8, without obvious suspended particulate, salt content 3.4
~3.8wt%.
Further, electrodialysis plant two end electrodes are Ti-Ru electrode, and filter is with a thickness of 200 μm；Anti- electrodialysis plant
The electrode at both ends is Ti-Ru electrode, and filter is with a thickness of 100 μm.
The method have the advantages that:
1. the present invention by ultrafiltration pretreatment device in seawater suspended matter and the pollutants such as bacterium carried out effectively
Removal, and sea water desalination is carried out using the strong homogeneous membrane electrodialysis of low resistance, high-crosslinking-degree, permselective property, by electric osmose
The regulation for analysing the water inlet ratio, flow velocity of deep or light room, under the premise of guaranteeing that light room water outlet conductivity reaches drinkable standard, ton water
Energy consumption is lower；
2. the present invention is using the strong anti-electrodialysis of extraordinary homogeneous membrane of low resistance, high-crosslinking-degree, permselective property to electrodialysis
Concentrated water is handled, and is generated electricity with the salt error between electrodialysis concentrated water and seawater, since the resistance that salt water has is lower, with
Traditional anti-electrodialysis power generation is compared, and power density obtained will be higher.Final anti-electrodialysis plant diluting compartment outlet
Mixing with the outlet of dense room and producing the salt content of water is 3.0wt%~4.0wt%, and difference is little compared with seawater salt content, while electricity
Pole two sides use monovalent anion exchange membrane, can stop Fe3+And Fe2+Pollution to seawater keeps anti-electric osmose division water straight
Run in into ocean, realizes the processing to electrodialysis concentrated water.And the anti-produced electric energy of electrodialysis can directly be used by power transformation device
In electrodialytic desalination equipment, this has been greatly reduced the operating cost of entire technique；
3. developing since this technique is the various features for electrodialytic desalination technique, anti-electrodialysis can be protected
The complete processing to electrodialysis concentrated water is demonstrate,proved, produced electric energy can be used for the use of electrodialysis plant, monovalent anion exchange again
Film can prevent iron atom to the pollution of seawater, basically reach the effect of electrodialysis concentrated water zero-emission, and realize preferable warp
Ji and social benefit.
4. the reusing rate of electrodialytic desalination reaches 65%~75%, the whole energy consumption that whole set process desalinizes seawater is
The use ratio of 6~7kWh/t, anti-electrodialysis power generation energy supply have reached 35~45%, than using electrodialytic desalination merely
Reduce 34~40% with cost, while reaching concentrated water zero-emission purpose.
Specific embodiment
The present invention is described further With reference to embodiment:
A kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater, the described method comprises the following steps:
(1) original seawater is squeezed into ultrafiltration pretreatment device by centrifugal pump, removes suspended matter in original seawater and thin
The pollutants such as bacterium squeeze into electrodialysis by 1: 1,1: 2,1: 3 volume ratio for centrifugal pump is passed through respectively by pretreated seawater
Deep or light room；
(2) after pretreated seawater enters electrodialysis plant, compound concentration is the Na of 0.2~0.3mol/L2SO4Pole room
Solution, by Na2SO4Pole room is squeezed into through centrifugal pump, deep or light room is controlled and pole room flow velocity is 100~300L/h；
(3) the current density control in electrodialysis plant is 200~400A/m2, through recycling desalination, until electrodialysis plant
When production water conductivity in diluting compartment outlet is reduced to 500~800 μ s/cm, it is passed through production water pot.
(4) enriched chamber's production water after above-mentioned electrodialytic desalination is squeezed into the desalination of anti-electrodialysis plant through centrifugal pump
Room, pretreated seawater are passed through the dense room of anti-electrodialysis, and compound concentration is the FeCl of 0.2mol/L3With FeCl2Pole room mixing it is molten
Liquid is passed through iron chloride and frerrous chloride mixed solution in pole room and circulates, and redox reaction occurs for two-stage, passes through outside
Circuit forms electric current.It reacts as follows:
Fe3++e-=Fe2+
Fe2+-e-=Fe3+
Anti- electrodialysis pole room is squeezed into through centrifugal pump, the deep or light room in anti-electrodialysis plant and pole room flow control be 150~
250L/h is circulated in the device, until the outlet of anti-electrodialysis plant diluting compartment mixes the salt content for producing water with the outlet of dense room
For 3.0wt%~4.0wt%, electric energy caused by anti-electrodialysis is through power transformation device directly for electrodialytic desalination electricity consumption.
The film that electrodialysis plant uses is homogeneous ion-exchange membrane, and film resistance is 1~4 Ω/cm2, the degree of cross linking be 75%~
90%, it is 2~13 that soda acid, which is resistant to pH,.
The film that anti-electrodialysis plant uses is homogeneous ion-exchange membrane, and film resistance is 0.8~1.6 Ω/cm2, the degree of cross linking is
80%-95%, it is 2~12 that soda acid, which is resistant to pH, and electrode two sides use monovalent anion exchange membrane, and film resistance is 1~3 Ω/cm2,
The selective penetrated property of film is greater than 97%.
Anti- electrodialysis uses membrane stack 400*800 type membrane stack, and membrane stack is provided with 150~200 pairs of extraordinary homogeneous ion-exchange membranes.
The pretreated seawater pH value is 7.6~7.8, is 3.4~3.8wt% without obvious suspended particulate, salt content.
Electrodialysis plant two end electrodes are Ti-Ru electrode, and filter is with a thickness of 200 μm；The electrode at anti-electrodialysis plant both ends
For Ti-Ru electrode, filter is with a thickness of 100 μm.
Embodiment 1:
To desalinate each processing unit design and installation and debugging of the treating capacity to entire technique of 1 ton of seawater per hour, most
After carry out site test:
1, seawater quality of the former seawater after ultrafiltration pretreatment is relatively preferable, wherein pH be 7.9, without obvious suspended particulate,
Salt content is 3.4wt%；
2, its seawater after ultrafiltration pretreatment squeezes into electrodialytic deep or light room by centrifugal pump in 1: 1 water inlet ratio,
Compound concentration is the Na of 0.2mol/L2SO4Pole room solution squeezes into electrodialysis pole room, the membrane stack 1 of 100 couples of 400*800 through centrifugal pump
Only, electrodialytic current density is 200A/m2, deep or light room and pole room flow velocity are 100L/h.The electrodialytic membranes used be homogeneously from
Proton exchange, wherein film resistance is 2 Ω/cm2, the degree of cross linking 75%, through recycling desalination, until electrodialysis plant diluting compartment exports
After production water conductivity is reduced to 500~800 μ s/cm, it is passed through production water pot；
3, it is 6.5wt% that the dense room after electrodialytic desalination, which produces water salt content, squeezes into anti-electrodialysis through centrifugal pump and desalinates
Room, pretreated seawater are passed through the dense room of anti-electrodialysis, and compound concentration is the FeCl of 0.2mol/L3With FeCl2Pole room mixing it is molten
Liquid squeezes into anti-electrodialysis pole room through centrifugal pump, controls deep or light room and pole room flow velocity is 150L/h；
4, anti-electrodialysis membrane stack is a 400*800 type membrane stack, wherein 100 pairs of extraordinary homogeneous ion-exchange membranes are filled with,
Film resistance is 1 Ω/cm2, the degree of cross linking 80%, through circulating generation, until the outlet of anti-electrodialysis plant diluting compartment is exported with dense room
The salt content that mixing produces water is 4wt%, and anti-electrodialysis is by energy caused by salt error energy through power transformation device directly for electrodialysis sea
Water desalination uses；
The reusing rate of last electrodialytic desalination reaches 65%, and the whole energy consumption that whole set process desalinizes seawater is
The use ratio of 6kWh/t, anti-electrodialysis power generation energy supply have reached 35%, than use merely the utilization of electrodialytic desalination at
Originally 40% is reduced, while reaching concentrated water zero-emission purpose.
Embodiment 2:
Desalinate each processing unit design and installation and debugging of the treating capacity to entire technique of 2 tons of seawater per hour, finally
Carry out site test:
1, seawater quality of the former seawater after ultrafiltration pretreatment is relatively preferable, wherein pH be 7.8, without obvious suspended particulate,
Salt content is 3.5wt%；
2, its seawater after ultrafiltration pretreatment squeezes into electrodialytic deep or light room by centrifugal pump in 1: 2 water inlet ratio,
Compound concentration is the Na of 0.25mol/L2SO4Pole room solution squeezes into electrodialysis pole room, the membrane stack 1 of 150 couples of 400*800 through centrifugal pump
Only, electrodialytic current density is 300A/m2, deep or light room and pole room flow velocity are 200L/h.The electrodialytic membranes used be homogeneously from
Proton exchange, wherein film resistance is 3 Ω/cm2, the degree of cross linking 80%, through recycling desalination, until electrodialysis plant diluting compartment exports
After production water conductivity is reduced to 500~800 μ s/cm, it is passed through production water pot；
3, it is 8wt% that the dense room after electrodialytic desalination, which produces water salt content, squeezes into anti-electrodialysis diluting compartment through centrifugal pump,
Pretreated seawater is passed through the dense room of anti-electrodialysis, and compound concentration is the FeCl of 0.25mol/L3With FeCl2Pole room mixing it is molten
Liquid squeezes into anti-electrodialysis pole room through centrifugal pump, controls deep or light room and pole room flow velocity is 200L/h；
4, anti-electrodialysis membrane stack is a 400*800 type membrane stack, wherein 150 pairs of extraordinary homogeneous ion-exchange membranes are filled with,
Film resistance is 1.5 Ω/cm2, the degree of cross linking 85%, through circulating generation, until the outlet of anti-electrodialysis plant diluting compartment goes out with dense room
The salt content that mouth mixing produces water is 3.8wt%, and anti-electrodialysis is by energy caused by salt error energy through power transformation device directly for electric osmose
Sea water desalination is analysed to use；
The reusing rate of last electrodialytic desalination reaches 70%, and the whole energy consumption that whole set process desalinizes seawater is
The use ratio of 6.5kWh/t, anti-electrodialysis power generation energy supply have reached 40%, than the utilization for using electrodialytic desalination merely
Cost reduces 36%, while reaching concentrated water zero-emission purpose.
Embodiment 3:
To desalinate each processing unit design and installation and debugging of the treating capacity to entire technique of 3 tons of seawater per hour, most
After carry out site test:
1, seawater quality of the former seawater after ultrafiltration pretreatment is relatively preferable, and wherein pH is 7.6, without obvious suspension
Grain, salt content 3.8wt%；
2, its seawater after ultrafiltration pretreatment squeezes into electrodialytic deep or light room by centrifugal pump in 1: 3 water inlet ratio,
Compound concentration is the Na of 0.3mol/L2SO4Pole room solution squeezes into electrodialysis pole room, the membrane stack 1 of 200 couples of 400*800 through centrifugal pump
Only, electrodialytic current density is 400A/m2, deep or light room and pole room flow velocity are 300L/h.The electrodialytic membranes used be homogeneously from
Proton exchange, wherein film resistance is 4 Ω/cm2, the degree of cross linking 85%, through recycling desalination, until electrodialysis plant diluting compartment exports
After production water conductivity is reduced to 500~800 μ s/cm, it is passed through production water pot；
3, it is 9.5wt% that the dense room after electrodialytic desalination, which produces water salt content, squeezes into anti-electrodialysis through centrifugal pump and desalinates
Room, pretreated seawater are passed through the dense room of anti-electrodialysis, and compound concentration is the FeCl of 0.3mol/L3With FeCl2Pole room mixing it is molten
Liquid squeezes into anti-electrodialysis pole room through centrifugal pump, controls deep or light room and pole room flow velocity is 250L/h；
4, anti-electrodialysis membrane stack is a 400*800 type membrane stack, wherein 200 pairs of extraordinary homogeneous ion-exchange membranes are filled with,
Film resistance is 1.8 Ω/cm2, the degree of cross linking 90%, through circulating generation, until the outlet of anti-electrodialysis plant diluting compartment goes out with dense room
The salt content that mouth mixing produces water is 3.5wt%, and anti-electrodialysis is by energy caused by salt error energy through power transformation device directly for electric osmose
Sea water desalination is analysed to use；
The reusing rate of last electrodialytic desalination reaches 75%, and the whole energy consumption that whole set process desalinizes seawater is
The use ratio of 7kWh/t, anti-electrodialysis power generation energy supply have reached 45%, than use merely the utilization of electrodialytic desalination at
Originally 34% is reduced, while reaching concentrated water zero-emission purpose.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (3)
1. a kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater, characterized in that the described method comprises the following steps:
(1) original seawater is squeezed into ultrafiltration pretreatment device by centrifugal pump, removes the suspended matter in original seawater and bacterium, it will
Pass through centrifugal pump respectively by pretreated seawater and squeezes into the deep or light room of electrodialysis by 1: 1,1: 2,1: 3 volume ratio；
(2) the pretreated seawater pH value is 7.6~7.8, is 3.4~3.8wt% without obvious suspended particulate, salt content,
After pretreated seawater enters electrodialysis plant, compound concentration is the Na of 0.2~0.3mol/L2SO4Pole room solution, will
Na2SO4Pole room is squeezed into through centrifugal pump, deep or light room is controlled and pole room flow velocity is 100~300L/h；
(3) the current density control in electrodialysis plant is 200~400A/m2, through recycling desalination, until electrodialysis plant is desalinated
When production water conductivity in room outlet is reduced to 500~800 μ s/cm, it is passed through production water pot；
(4) enriched chamber's production water after above-mentioned electrodialytic desalination is squeezed into the diluting compartment of anti-electrodialysis plant through centrifugal pump, in advance
Treated, and seawater is passed through the dense room of anti-electrodialysis, and anti-electrodialysis uses membrane stack 400*800 millimeters of type membrane stack, and membrane stack is provided with 150
~200 pairs of extraordinary homogeneous ion-exchange membranes, homogeneous ion-exchange membrane resistance are 0.8~1.6 Ω/cm2, the degree of cross linking be 80%~
95%, it is 2~12 that soda acid, which is resistant to pH, and electrode two sides use monovalent anion exchange membrane, and film resistance is 1~3 Ω/cm2, the choosing of film
Permeability is selected greater than 97%；Compound concentration is the FeCl of 0.2mol/L3With FeCl2Pole room mixed solution, squeezed into instead through centrifugal pump
Electrodialysis pole room, deep or light room and pole room flow control in anti-electrodialysis plant are 150~250L/h, in the device recycle stream
It is dynamic, until the outlet of anti-electrodialysis plant diluting compartment is 3.0wt%~4.0wt% with the salt content that the outlet of dense room mixes production water, instead
Electric energy caused by electrodialysis is through power transformation device directly for electrodialytic desalination electricity consumption.
2. a kind of anti-electrodialysis of coupling according to claim 1 and electrodialytic method for desalting seawater, it is characterised in that: electricity
The film that electrodialysis apparatus uses is homogeneous ion-exchange membrane, and film resistance is 1~4 Ω/cm2, the degree of cross linking is 75%~90%, and soda acid is resistance to
It is 2~13 by pH value.
3. a kind of anti-electrodialysis of coupling according to claim 1 and electrodialytic method for desalting seawater, it is characterised in that: electricity
Electrodialysis apparatus two end electrodes are Ti-Ru electrode, and filter is with a thickness of 200 μm；The electrode at anti-electrodialysis plant both ends is that titanium applies ruthenium electricity
Pole, filter is with a thickness of 100 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510439862.9A CN105060575B (en) | 2015-07-17 | 2015-07-17 | A kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater |
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| CN201510439862.9A CN105060575B (en) | 2015-07-17 | 2015-07-17 | A kind of anti-electrodialysis of coupling and electrodialytic method for desalting seawater |
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| Publication Number | Publication Date |
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| CN105060575A CN105060575A (en) | 2015-11-18 |
| CN105060575B true CN105060575B (en) | 2018-12-07 |
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| CN106044971A (en) * | 2016-07-21 | 2016-10-26 | 沧州中铁装备制造材料有限公司 | High-temperature electrodialysis desalination method for saline |
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| TW200711212A (en) * | 2005-07-20 | 2007-03-16 | Vito | Salinity gradient power reverse electrodialysis plant and use thereof |
| CN101516786A (en) * | 2006-09-20 | 2009-08-26 | 西门子水处理技术公司 | Method and apparatus for desalination |
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| TW200711212A (en) * | 2005-07-20 | 2007-03-16 | Vito | Salinity gradient power reverse electrodialysis plant and use thereof |
| CN101516786A (en) * | 2006-09-20 | 2009-08-26 | 西门子水处理技术公司 | Method and apparatus for desalination |
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