CN115159637B - Device for desalting seawater and recovering acid and alkali - Google Patents
Device for desalting seawater and recovering acid and alkali Download PDFInfo
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- CN115159637B CN115159637B CN202210620184.6A CN202210620184A CN115159637B CN 115159637 B CN115159637 B CN 115159637B CN 202210620184 A CN202210620184 A CN 202210620184A CN 115159637 B CN115159637 B CN 115159637B
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- 239000003513 alkali Substances 0.000 title claims abstract description 59
- 239000002253 acid Substances 0.000 title claims abstract description 57
- 238000011033 desalting Methods 0.000 title claims abstract description 33
- 239000013535 sea water Substances 0.000 title claims description 32
- 239000012528 membrane Substances 0.000 claims abstract description 43
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000002242 deionisation method Methods 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 239000002585 base Substances 0.000 claims abstract description 13
- 230000000813 microbial effect Effects 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000010612 desalination reaction Methods 0.000 claims description 41
- 239000003011 anion exchange membrane Substances 0.000 claims description 25
- 238000011084 recovery Methods 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000012267 brine Substances 0.000 claims description 21
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 21
- 239000013505 freshwater Substances 0.000 claims description 16
- 230000002572 peristaltic effect Effects 0.000 claims description 16
- 238000005341 cation exchange Methods 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 9
- 239000002028 Biomass Substances 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 abstract description 12
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 239000003014 ion exchange membrane Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- -1 salt ions Chemical class 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 229910001415 sodium ion Inorganic materials 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000009296 electrodeionization Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention provides a device for desalting and recovering acid and alkali by a microbial fuel cell coupling flow electrode. The device comprises a microbial fuel cell, a flowing electrode capacitance deionizing device, an external circuit and an acid-base production chamber; the microbial fuel cell is used as a power supply to form a loop together with the flowing electrode capacitive deionization device and the external circuit. Using a microbial fuel cell as a power source; the positions of the titanium mesh anode and the electrode liquid are adjusted, so that the titanium mesh anode is closely abutted against the ion exchange membrane, the charge transmission distance is reduced, and the ion adsorption capacity is improved; a plurality of groups of turbulence stirring devices which rotate relatively are arranged in the flowing area of the electrode liquid, so that the mixing of active carbon particles in the flowing electrode liquid is enhanced, and the desalting efficiency is greatly improved; when acid and alkali are produced, the rectangular comb-shaped double-layer membrane structure is used, so that the contact area of the bipolar membrane and the ion exchange membrane is increased, the moving distance of ions in an acid-alkali chamber is shortened, the uniformity of acid production and alkali production is improved, and the acid-alkali production efficiency is improved.
Description
Technical Field
The invention relates to a microbial fuel cell coupling flow electrode device capable of desalting and recycling acid and alkali, belonging to the technical fields of microbial fuel cells, flow electrode capacitance deionization and acid and alkali production.
Background
With the rapid development of society, the living conditions of human beings are increasingly improved, and the problems of resource shortage, energy shortage and the like accompanying the living conditions are also gradually exposed. Especially the problem of lack of fresh water resources, needs to be treated with emphasis. Various methods have been proposed to solve such problems as membrane separation, distillation, ion exchange, electrodeionization, freeze desalination, etc., but these techniques all require additional energy sources and have relatively high energy consumption, which is disadvantageous for the development of recycling economy. In addition, the microbial fuel cell has a poor desalting efficiency for strong brine and cannot continuously perform desalting, and the limitation of the coupling capacitance deionization of the microbial fuel cell is also reflected in that the coupling capacitance deionization can only be used for desalting, purifying sewage and the like, and has no great advantage in other aspects.
The strong brine is usually introduced into the evaporation pond in China, but the method has obvious defects, and if the structure is unreasonable, the strong brine is easy to leak, and the strong brine is permeated into underground water to pollute the underground water. In the foreign countries, strong brine is generally utilized to irrigate plants with high salinity tolerance or to cultivate salt-water fishes (for example, australia is currently exploring to cultivate salt-water fishes by using the strong brine), and the salt-water fishes can also be used as supplementing water for ecological scenic spots, but in general, the plant types and regions suitable for the strong brine are fewer, and scale formation is difficult. Therefore, the current strong brine treatment has limitations in most cases. Thus, providing a method for recycling strong brine into a cost-effective product has become a trend and challenge for social development.
CN207566948U discloses a desalination device for a microbiological fuel cell in combination with capacitive deionization. However, when the device is used for desalting, the electrodes can be saturated, then a series of electrode regeneration operations are needed, and the wires for connecting the titanium collector with the cathode electrode and the anode electrode are disconnected, so that the two wires on the titanium collector are connected to form short-circuit discharge. The method is quite cumbersome, continuous desalination cannot be realized, and the strong brine flowing out after the regeneration of the electrode is not utilized.
CN107624106a discloses a single-module flow electrode device for capacitive deionization for continuous water desalination, ion separation and selective removal and concentration of ions. The collector of the device is positioned at the outer side of the flowing electrode liquid, is far away from the ion exchange membrane, the charge transmission capacity is reduced, along with the progress of the desalting process, the flowing electrode liquid gradually tends to be stable, the electrode liquid flow channel has a certain space, once the flowing electrode liquid is stabilized, the active carbon particles in the flowing electrode liquid tend to be at two extreme ends, the adsorption quantity of the active carbon particles close to the membrane is large, the adsorption quantity of the active carbon particles far away from the membrane is small, the uniformity of the adsorbed ions of the flowing electrode liquid is poor, and the problems of low utilization rate of the flowing electrode, great desalting performance and the like are caused.
Disclosure of Invention
The invention aims to: in view of the above problems, the present invention provides a microbial fuel cell coupled flow electrode device capable of achieving desalination and recovering acid and alkali.
The technical scheme is as follows: the invention relates to a device for desalting sea water and recovering acid and alkali, which comprises a desalting system and an acid and alkali recovery system, wherein the desalting system comprises a deionization desalting device, an electrode liquid flowing area of the deionization desalting device is provided with a plurality of turbulence stirrers, and the rotation directions of adjacent turbulence stirrers are opposite to each other so as to stir active carbon particles in the electrode liquid; the acid-base recovery system comprises an acid chamber and an alkali chamber, wherein the acid chamber and the alkali chamber are separated by a baffle (108), rectangular comb-tooth-shaped bipolar membranes are arranged in the acid chamber and the alkali chamber, an anion exchange membrane is arranged on one side of the bipolar membrane in the acid chamber, a cation exchange membrane is arranged on one side of the bipolar membrane in the alkali chamber, and the anion exchange membrane and the cation exchange membrane are attached to a titanium alloy bracket resistant to acid and alkali corrosion.
The deionization desalination device comprises flowing electrode liquid, a bottom plate, a titanium mesh negative electrode and a titanium mesh positive electrode which are correspondingly arranged, wherein anion exchange membranes are arranged on the inner sides of the titanium mesh negative electrode and the titanium mesh positive electrode, the titanium mesh positive electrode is closely adjacent to the anion exchange membranes, cation exchange membranes are arranged between the anion exchange membranes, the bottom plate is arranged on the outer sides of the titanium mesh negative electrode and the titanium mesh positive electrode, the titanium mesh negative electrode is closely adjacent to the bottom plate, a turbulent flow stirrer is arranged in a space formed by the titanium mesh negative electrode and the anion exchange membranes and a space formed by the titanium mesh positive electrode and the bottom plate, and the flowing electrode liquid circularly flows in the space through a peristaltic pump.
Wherein the rotating speed of the turbulent stirrer is 15-20RPM.
The desalination system further comprises a seawater chamber and a fresh water chamber, wherein the seawater chamber is connected with the deionization desalination device through a three-way valve, and the fresh water chamber is connected with the deionization desalination device.
Wherein, acid-base recovery system still includes dense brine chamber, the fixed upper portion that sets up in dense brine chamber of titanium alloy support.
Wherein, the upper part of the bipolar membrane in the acid chamber is provided with an anode electrode, and the upper part of the bipolar membrane in the alkali chamber is provided with a cathode electrode.
Wherein, organic biomass is attached to the outer surface of the anode electrode.
Wherein the organic biomass is one of low-concentration organic wastewater, cellulose, glucose and methane.
Wherein the electricity generated by the anode electrode and the cathode electrode is supplied to the desalination system through a lead.
Wherein, acid-base recovery system is the three-dimensional groove, and the gas outlet has been seted up to the upper portion in three-dimensional groove.
The acid chamber is provided with a hydrochloric acid outlet after passing through the peristaltic pump, and the alkali chamber is provided with a sodium hydroxide outlet after passing through the peristaltic pump.
The desalination system further comprises a valve, and the valve is respectively connected with the desalination system and the acid-base recovery system through pipelines.
Desalination mechanism: sodium ions in the seawater are pushed into the salinization zone by the repulsive force of the titanium mesh anode, chloride ions in the seawater are brought into the flowing electrode liquid by the strong attractive force of the titanium mesh anode and adsorbed by activated carbon particles, and the chloride ions in the seawater are brought to the anion exchange membrane at the other side by the driving force of the peristaltic pump by the flowing electrode liquid and are pushed into the salinization zone by the repulsive force of the titanium mesh anode, so that strong brine can be collected in the salinization zone, and the concentration of the salt ions in the desalination zone is reduced, thereby producing fresh water.
Acid-base recovery mechanism: the bipolar membrane in the acid chamber (hydroxide ion diffusion side is upward) diffuses hydrogen ions inwards, and chloride ions in the concentrated salt water chamber are attracted by the anode electrode and enter the acid chamber through the anion exchange membrane to combine with the hydrogen ions into hydrochloric acid. The bipolar membrane (with the hydrogen ion diffusion side upwards) in the alkali chamber on the right side of the partition plate diffuses hydroxide ions inwards, sodium ions in the concentrated salt water chamber are attracted by the cathode, enter the alkali chamber through the cation exchange membrane, and are combined with the hydroxide ions to form sodium hydroxide.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages:
(1) The invention combines desalination and recovery of acid and alkali for treating seawater, and can simultaneously achieve the double effects of desalting seawater into fresh water and recovering salt in the seawater into acid and alkali.
(2) According to the acid-base recovery system, the titanium mesh anode is abutted against the anion exchange membrane, so that the charge transmission distance is reduced, and the adsorption effect of activated carbon particles in flowing electrode liquid is improved;
(3) According to the desalination system disclosed by the invention, the plurality of groups of turbulence stirrers which rotate relatively are arranged in the flowing electrode liquid, so that the motion rule of active carbon particles in the flowing electrode liquid is controlled, almost every active carbon particle can adsorb ions, the ion adsorption uniformity is realized, and the utilization rate of the flowing electrode liquid and the desalination effect are improved;
(4) The acid-base recovery system adopts the rectangular comb-shaped double-layer membrane, so that the contact area of the bipolar membrane and the ion exchange membrane is increased, the volume is reduced, the titanium alloy framework is utilized for supporting, acid and alkali corrosion resistance is realized, the membrane is also protected from deformation, the distribution uniformity of ions is improved, and the rate of combining ions into acid and alkali is accelerated.
Drawings
FIG. 1 is a block diagram of an apparatus for desalting sea water and recovering acid and alkali according to the present invention;
FIG. 2 is a block diagram of a deionization desalination device;
FIG. 3 is a flow chart of the operation of the apparatus for desalting sea water and recovering acid and alkali according to the present invention;
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
The device for desalting sea water and recovering acid and alkali disclosed by the invention is shown in fig. 1, and comprises a desalting system 200 and an acid and alkali recovery system 100.
Wherein, the desalination system 200 comprises a seawater chamber 201, a fresh water chamber 204 and a deionized water desalination device 203, wherein the seawater chamber 201 is connected with the deionized water desalination device 203 through a three-way valve 202, and the fresh water chamber 204 is connected with the deionized water desalination device 203. The lower part of the fresh water chamber 204 is provided with a fresh water outlet 205, and the deionization and desalination device 203 is connected with the acid-base recovery system 100 through a valve 206.
As shown in fig. 3, the deionization and desalination device 203 is shown in fig. 3, the deionization and desalination device 203 includes a peristaltic pump 2031, a flowing electrode liquid 2037, a bottom plate 2038, a titanium mesh negative electrode 2032 and a titanium mesh positive electrode 2033 which are correspondingly arranged, anion exchange membranes 2034 are respectively arranged on the inner sides of the titanium mesh negative electrode 2032 and the titanium mesh positive electrode 2033, a cation exchange membrane 2035 is arranged between the two anion exchange membranes 2034, and the cation exchange membrane 2035 divides the deionization and desalination device 203 into a desalination area and a salinization area. The outer sides of the titanium mesh negative electrode 2032 and the titanium mesh positive electrode 2033 are respectively provided with a bottom plate 2038, the titanium mesh negative electrode 2032 is abutted against the bottom plate 2038, the titanium mesh negative electrode 2032 and the anion exchange membrane 2034 form a space, the titanium mesh positive electrode 2033 and the bottom plate 2038 form a space, then a plurality of turbulence stirrers 2036 are arranged in the formed space, and the peristaltic pump 2031 circularly flows the flowing electrode liquid 2037 in the formed space. The space formed above is filled with activated carbon particles. The adjacent turbulent agitators 2036 rotate in opposite directions to agitate the activated carbon particles in the electrode solution. The speed of the turbulent agitator 2036 is 15-20RPM.
Wherein, the acid-base recovery system 100 comprises an acid chamber, an alkali chamber and a strong brine chamber 115, the acid chamber and the alkali chamber are separated by a baffle 108, rectangular comb-shaped bipolar membranes 104 are arranged in the acid chamber and the alkali chamber, an anion exchange membrane 107 is arranged on one side of the bipolar membrane 104 in the acid chamber, a cation exchange membrane 109 is arranged on one side of the bipolar membrane 104 in the alkali chamber, and the anion exchange membrane 107 and the cation exchange membrane 109 are attached to a titanium alloy bracket 113 resistant to acid and alkali corrosion. The titanium alloy bracket 113 is fixedly provided at an upper portion of the concentrated brine chamber 115. An anode 103 is provided on the bipolar membrane 104 in the acid chamber, and a cathode 111 is provided on the bipolar membrane 104 in the alkali chamber. Wherein, organic biomass is attached to the outer surface of the anode electrode 103. The anode electrode 103 and the cathode electrode 111 constitute a microbial fuel cell. The organic biomass may be low concentration organic wastewater, cellulose, glucose, methane, and the like. The anode electrode 103 and the cathode electrode 111 are connected by a wire 101 for the deionization and desalination device 203 of the desalination system 100. The whole acid-base recovery system 100 is a three-dimensional groove, and the upper part of the three-dimensional groove is provided with an air outlet 102. A peristaltic pump 105 is arranged outside the acid chamber, the peristaltic pump 105 discharges hydrochloric acid from the hydrochloric acid outlet 106, a peristaltic pump (105) is also arranged outside the alkali chamber, and the peristaltic pump 105 discharges sodium hydroxide from the sodium hydroxide outlet 114.
When the device for desalting sea water and recovering acid and alkali is used, as shown in fig. 3, and when power is supplied, microorganisms consume organic biomass at the anode electrode 103 to generate carbon dioxide and electrons, the carbon dioxide is discharged from the gas outlet 102, and the electrons move to the cathode electrode 111 to perform reduction reaction to generate water; the bipolar membrane 104 in the acid chamber (hydroxide ion diffusion side up) diffuses hydrogen ions inward, and chloride ions in the strong brine chamber 115 are attracted by the anode electrode 103 and enter the acid chamber through the anion exchange membrane 107, and combined with hydrogen ions into hydrochloric acid is collected from the hydrochloric acid outlet 106 by the peristaltic pump 105. The bipolar membrane 112 (with the hydrogen ion diffusion side upwards) in the alkali chamber at the right side of the partition plate 108 diffuses hydroxide ions inwards, sodium ions in the concentrated salt water chamber 115 are attracted by the cathode 111, enter the alkali chamber through the cation exchange membrane 109, and are combined with hydroxide ions into sodium hydroxide to be collected from a sodium hydroxide outlet 114 by the peristaltic pump 105, the contact area between the rectangular comb-shaped double-layer membrane 104 and the anion exchange membrane 107 and the cation exchange membrane 109 is increased, the volume is reduced, the titanium alloy support 113 is used for supporting, the titanium alloy support 113 is acid and alkali corrosion resistant, and the double-layer membrane 104, the anion exchange membrane 107 and the cation exchange membrane 109 can be protected, so that the distribution uniformity of ions is improved, and the acid and alkali combination rate of ions is accelerated; the microbial fuel cell supplies power to the deionizing device 203 through the lead 101, seawater enters the brine chamber 201 and is split by the three-way valve 202, a part of seawater enters the desalination area of the deionizing device 203, sodium ions in the seawater are pushed by repulsive force of the titanium mesh positive electrode 2033 to push the cation exchange 2034 to enter the salinization area, chloride ions in the seawater are brought into the flowing electrode liquid 2037 by strong attractive force of the titanium mesh positive electrode 2033 and are adsorbed by activated carbon particles, the charge transmission distance is reduced due to the fact that the titanium mesh positive electrode is closely abutted against the anion exchange membrane, the adsorption effect of the activated carbon particles in the flowing electrode is improved, and due to the intervention of the turbulence stirring device 2036, the motion rule of the activated carbon particles is controlled, so that almost every activated carbon particle can adsorb chloride ions, the ion adsorption uniformity is achieved, and the utilization rate and the desalination effect of the flowing electrode liquid are improved. Due to the driving force of the peristaltic pump 2031, chloride ions in the seawater are brought to the anion exchange membrane 2034 on the other side by the flowing electrode liquid 2037 and are pushed into the salinization zone by the repulsive force of the titanium mesh negative electrode 2032, so that the salinization zone can collect strong brine and is controlled by the valve 206 to be discharged into the strong brine chamber 115, fresh water is produced in the desalination zone due to the reduction of the concentration of the salt ions, the fresh water flows into the fresh water chamber 204 to be collected, and the fresh water is discharged out of the system from the fresh water chamber outlet 205 for people to use.
Claims (8)
1. The device for desalting sea water and recovering acid and alkali is characterized by comprising a desalting system (200) and an acid and alkali recovery system (100), wherein the desalting system (200) comprises a deionization desalting device (203), a plurality of turbulence stirrers (2036) are arranged in an electrode liquid flow area of the deionization desalting device (203), and the rotation directions of adjacent turbulence stirrers (2036) are opposite to each other so as to stir activated carbon particles in the electrode liquid; the acid-base recovery system (100) comprises an acid chamber and an alkali chamber, wherein the acid chamber and the alkali chamber are separated by a baffle plate (108), rectangular comb-tooth-shaped bipolar membranes (104) are arranged in the acid chamber and the alkali chamber, an anion exchange membrane (107) is arranged on one side of the bipolar membrane (104) in the acid chamber, a cation exchange membrane (109) is arranged on one side of the bipolar membrane (104) in the alkali chamber, and the anion exchange membrane (107) and the cation exchange membrane (109) are attached to a titanium alloy bracket (113) resistant to acid and alkali corrosion; the deionization desalination device (203) comprises flowing electrode liquid (2037), a bottom plate (2038), a titanium mesh negative electrode (2032) and a titanium mesh positive electrode (2033) which are correspondingly arranged, wherein an anion exchange membrane (2034) is arranged on the inner sides of the titanium mesh negative electrode (2032) and the titanium mesh positive electrode (2033), the titanium mesh positive electrode (2033) is abutted against the anion exchange membrane (2034), a cation exchange membrane (2035) is arranged between the anion exchange membranes (2034), the bottom plate (2038) is arranged on the outer sides of the titanium mesh negative electrode (2032) and the titanium mesh positive electrode (2033), the titanium mesh negative electrode (2032) is abutted against the bottom plate (2038), a turbulent flow stirrer (2036) is arranged in a space formed by the titanium mesh negative electrode (2032) and the anion exchange membrane (2034) and a space formed by the titanium mesh positive electrode (2033) and the bottom plate (2038), and the flowing electrode liquid (2037) circularly flows in the space through a peristaltic pump (2031); an anode electrode (103) is arranged at the upper part of the bipolar membrane (104) in the acid chamber, a cathode electrode (111) is arranged at the upper part of the bipolar membrane (104) in the alkali chamber, organic biomass is attached to the outer surface of the anode electrode (103), and the anode electrode (103) and the cathode electrode (111) form a microbial fuel cell; the microbial fuel cell powers a deionization desalination device (203).
2. The apparatus for seawater desalination and recovery of acid-base as claimed in claim 1, wherein the rotation speed of the turbulent agitator (2036) is 15-20RPM.
3. The device for desalting sea water and recovering acid and alkali according to claim 1, wherein the desalting system further comprises a sea water chamber (201) and a fresh water chamber (204), the sea water chamber (201) is connected with the deionization desalting device (203) through a three-way valve (202), and the fresh water chamber (204) is connected with the deionization desalting device (203).
4. The apparatus for desalting sea water and recovering acid and alkali according to claim 1, wherein the acid and alkali recovery system (100) further comprises a concentrated brine chamber (115), and the titanium alloy bracket (113) is fixedly arranged at the upper part of the concentrated brine chamber (115).
5. The apparatus for desalination of sea water and recovery of acid and alkali according to claim 1, wherein the electricity generated by the anode electrode (103) and the cathode electrode (111) is supplied to the desalination system (100) through a wire (101).
6. The device for desalting sea water and recovering acid and alkali according to claim 1, wherein the acid and alkali recovery system (100) is a three-dimensional tank, and an air outlet (102) is formed in the upper portion of the three-dimensional tank.
7. The device for seawater desalination and recovery of acid and alkali as claimed in claim 1, wherein the acid chamber is provided with a hydrochloric acid outlet (106) after passing through a peristaltic pump (105), and the alkali chamber is provided with a sodium hydroxide outlet (114) after passing through the peristaltic pump (105).
8. The apparatus for desalination of sea water and recovery of acid and alkali according to claim 1, wherein the desalination system (200) further comprises a valve (206), the valve (206) being connected to the desalination system (200) and the acid and alkali recovery system (100) respectively by pipes.
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| KR20150003094A (en) * | 2013-06-28 | 2015-01-08 | 한국에너지기술연구원 | Flow-electrode capacitive deionizaion apparatus using ion exchange membranes |
| CN105858828A (en) * | 2016-06-03 | 2016-08-17 | 华东师范大学 | Asymmetric-flow electrode desalting plant |
| CN107624106A (en) * | 2015-01-16 | 2018-01-23 | Dwi莱布尼茨互动材料研究所协会 | The method of continuous water desalination and ion isolation is carried out by capacitive deionization and its single module flows electrode assembly |
| CN108114599A (en) * | 2017-12-25 | 2018-06-05 | 中国科学技术大学 | It is a kind of based on salt error the electrodialysis reversal of production soda acid to be driven to couple bipolar membranous system and its production method |
| CN112209540A (en) * | 2020-08-28 | 2021-01-12 | 浙江工业大学 | Zero-discharge coupling process for high-salt high-COD wastewater |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190322558A1 (en) * | 2018-04-19 | 2019-10-24 | Apoorva Goel | Microbial Electrochemical Cell and direct salt recovery |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150003094A (en) * | 2013-06-28 | 2015-01-08 | 한국에너지기술연구원 | Flow-electrode capacitive deionizaion apparatus using ion exchange membranes |
| CN107624106A (en) * | 2015-01-16 | 2018-01-23 | Dwi莱布尼茨互动材料研究所协会 | The method of continuous water desalination and ion isolation is carried out by capacitive deionization and its single module flows electrode assembly |
| CN105858828A (en) * | 2016-06-03 | 2016-08-17 | 华东师范大学 | Asymmetric-flow electrode desalting plant |
| CN108114599A (en) * | 2017-12-25 | 2018-06-05 | 中国科学技术大学 | It is a kind of based on salt error the electrodialysis reversal of production soda acid to be driven to couple bipolar membranous system and its production method |
| CN112209540A (en) * | 2020-08-28 | 2021-01-12 | 浙江工业大学 | Zero-discharge coupling process for high-salt high-COD wastewater |
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| CN115159637A (en) | 2022-10-11 |
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