LU502575B1 - System and method for extracting pure water and concentrating and desalinating seawater - Google Patents
System and method for extracting pure water and concentrating and desalinating seawater Download PDFInfo
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- LU502575B1 LU502575B1 LU502575A LU502575A LU502575B1 LU 502575 B1 LU502575 B1 LU 502575B1 LU 502575 A LU502575 A LU 502575A LU 502575 A LU502575 A LU 502575A LU 502575 B1 LU502575 B1 LU 502575B1
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/04—Methods or installations for obtaining or collecting drinking water or tap water from surface water
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- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- 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
- C02F1/4693—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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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
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- Sustainable Energy (AREA)
- Public Health (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a device through a seawater pump, the electrodialysis output end of the electrodialysis device is connected with the desalinated seawater storage tank, the outlet of the desalinated seawater storage tank is connected with the inlet of a desalinated seawater heater through the desalinated seawater pump, the outlet of the desalted water heater is connected with the desalted water inlet of the direct-contact membrane distillation device, the desalted water outlet of the direct-contact membrane distillation device is connected with the circulating return inlet of the desalted water storage tank through the second water stop valve, the outlet of the pure water storage tank is connected with the input end of the cold water pump through the first water stop valve, the output end of the cold water pump is connected with the pure water inlet of the direct-contact membrane distillation device.
Description
DESCRIPTION LU502575 System and method for extracting pure water and concentrating and desalinating seawater
TECHNICAL FIELD The invention relates to the technical field of water treatment, in particular to a system and method for extracting pure water and concentrating and desalinating seawater,
BACKGROUND With the development of social economy, the earth's freshwater resources can no longer meet the requirements of social development Desalination of seawater has become an important way for people to solve the crisis of freshwater resources. At present, membrane distillation, reverse camosis, multistage flash evaporation and electrodialyais are widely used in seawater desalination. Among them, electrodialysis technology is a membrane separation technology, which uses the potential difference as the driving force and the selective permeability of ion exchange membrane to separate the salts of charged components from the water of uncharged components. With the development of electrodialysis technology, it has been widely used in seawater desalination and industrial pure water production. However, due to the high salinity of seawater, the homogeneous ion exchange membrane is easy to be poituted, which will reduce the service life of the membrane and increase the system cost.
SUMMARY The purpose of the invention ts to provide a system and method for extracting pure water and concentrating and desalinating seawater. The invention can carry out preliminary seawater desalination and produce by-products such as low-concentration acid-base liquid by electrodialysis technology. The purpose of pure water extraction can be realized after the preliminariiy desalinated seawater passes through a direci-contact membrane distillation device, and the acid produced during electrodialysis can be used for membrane cleaning. The system performs electrodialysis and direct-contact membrane distillation on seawater, which can realize the conversion of high-conceniration seawater to fresh water and industrial pure water, thus maximizing water resources, and realizing the volume concentration of desalinated seawater, which can be used for salt production in subsequent treatment.
in order to achieve this purpose, the system for extracting pure water and concentrating and desahinating seawater designed by the invention 15 characterized in that it comprises a stock solution pump, an ultrafiltration device, a seawater pump, an electrodialysis device, a desalinated seawater pump, a desalinated seawater heater, a desalinated seawater storage tankU502575 a direct-contact membrane distillation device, a cold water pump and a pure water storage tank, wherein the stock solution pump 1s provided with a raw seawater iniet, and the ultrafiltration input end of the ultrañltration device is connected with the outlet of the stock solution pump, the uitrafiltration output end of the uitrafiitration device is connected with the electrodialysis input end of the electrodialysis device through a seawater pump, the electrodialysis output end of the electrodialysis device is connected with the inlet of the desalinated seawater storage tank, the outlet of the desalinaied seawater storage tank is connected with the inlet of the desalinated seawater heater through the desalinated seawater pump, and the outlet of the desalinated seawater heater is connected with the desabinated seawater inlet of the direct-contact membrane distillation device, the desalinated seawater outlet of the direct-contact membrane distillation device is connected with the desalinated seawater circulating reflux inlet of the desalinated seawater storage tank through the second water stop valve, the outlet of the pure water storage tank is connected with the input end of the cold water pump through the first water stop valve, the output end of the cold water pump 15 connected with the pure water inlet of the direct- contact membrane distillation device, and the pure water outlet of the direct-contact membrane distillation device is connected with the ule of the pure water storage tank.
À method for extracting pure water and concentrating and desalinating seawater by using the above system is characterized by comprising the following steps: 1: delivering the raw seawater feed solution to the ultrafiltration device by à stock solution pump to finish the preliminary pretreatment of seawater, thus filtering out the particulate matter in seawater to obtain filtered seawater, 2: pumping the filtered seawater in the ultrafiltration device with a seawater pump, and sending it into the electrodialysis device, wherein the electrodialysis output end of the electrodialysis device is connected with the desalted seawater storage tank to deliver the desalted seawater to the desalted seawater storage tank:
3. pumping the desalinated seawater into the desalinated seawater heater by the desalinated seawater pump, heating it to 65-75°C in the desalinated seawater heater, and then entering the tube pass part of the direct-contact membrane distillation device from the desalinated seawater inlet, pumping the pure water at 25--30°C into the shell pass part of the direct-contact membrane distillation device by a cold water pump from the outlet of a pure water storage tank, and making the desalinated seawater flow through the hydrophobic hollow fiber membrane of the direct- contact membrane distillation device, the pure water at 25-30°C flow in the shell pass of the direct-contact membrane distillation device, and the water molecules in the desalinated seawater be absorbed by the pure water at 25-30°C through the membrane pores after beuldJ502575 converted into water vapor, so as to realize the purpose of pure water extraction with the pure Water at 25-30°C flowing back to the inlet of the pure water storage tank; closing the first water stop valve in the outlet pipeline of the pure water storage tank and the second valve in the desalinated seawater circulating reflux inlet of the desalinated seawater storage tank, thus cirenlating the pure water at 25-30°C in the pure water storage tank and desalinated seawater; 4: the heating temperature of the desalinated seawater in the above-mentioned circulating treatment process is measured by a temperature sensor connected with the desalinated seawater inlet of the direct-contact membrane distillation device, and the desalinated seawater heater is controlled to keep the water temperature at the inlet of the desalinated seawater at 65-75°C and the pure water temperature at the outlet of the pure water storage tank at 25-30°C; the conductivity sensor 1s used to detect the conductivity of the pure water at the outlet of the pure water storage tank, when the conductivity of the pure water is higher than 1Dus/em, the first valve and the second valve are opened to stop the circulation and clean the hydrophobic hollow fiber membrane with the acid solution generated in the electrodialysis process.
The invention has the advantages that:
1. In the invention, the solar energy technology 15 used for cogeneration of heat and power to power the electrodialysis device, the electrodialysis technology is used to desalinate the seawater stock solution, and by-products of acid solution (hydrochiorie acid} and alkah solution {sodium hydroxide} are produced for cleaning the polluted membrane at the later stage, which is beneficial to the effective utilisation of high-salt seawater and the effective comprehensive treatment of the system.
2. In the invention, the solar energy technology is used for cogeneration of heat and power to heat the desalted seawater stock solution obtained after electrodialysis, that is, the desalted seawater heater is a heat exchange device with the heat collected by solar energy and the cold desalted seawater stock solution, so that the industnal grade pure water can be prepared by using the direci-contaci membrane distillation technology with the desalted seawater at 63-75°C as the raw material, which can be used for industrial production, and the volume concentration of the desalted seawater can be realized at the same time, and the concentraied desalted seawater can be used in the later sait making process.
3. The electric energy and heat energy used in the invention are provided by the solar energy device, and the dilute hydrochloric acid used for cleaning the membrane ts self-made in the process of systematic electrodialysis, without additional chemical inputs, and the generated by-product dilute alkali solution is centrally recovered for later industrial production, without additional chemical waste, thus realizing the renewable utilization of energy and envirommentslU502575 protection.
4. The raw material used in the invention is high-salt seawater, which has the advantages of low production cost, long running time, stable system and good practical feasibility.
DETAILED DESCRIPTION OF THE INVENTION À system for extracting pure water and concentrating and desalinating seawater as shown in Figure 1 comprises a stock solution pump 1, an ultrafiliration device 2, a seawater pump 3, an electrodialysis device 4, a desalinated scawater pump 5, a desalinated seawater heater 6, à desalinated seawater storage tank 7, a direct-contact membrane distillation device 8, a cold water pump 9 and a pure water storage tank 10, wherein the stock solution pump 1 18 provided with a raw seawater inlet, the ultrafiltration input end 2.1 of the ultrafiltration device 2 is connected with the outlet of the stock solution pump 1, the ultrafiltration output end 2.2 of ultrafiltrafion device 2 is connected with electrodialysis input end 4.1 of electrodialysis device 4 through seawater pump 3, the electrodialysis output end 4.4 of electrodialysis device 4 is connected with the inlet 7.1 of desalinated seawater storage tank 7, the outlet 7.2 of desalinated seawater storage tank 7 is connected with the inlet of desalinated seawater heater 6 through desabinated seawater pump 5, the outlet of desalivated seawater heater © 18 connected with the desalinated seawater inlet 8.1 of membrane distillation device 8, the desalinated seawater outlet
8.4 of the direct-contact membrane distillation device 8 is connected with the desalinated seawater circulating reflux inlet 73 of the desalinated seawater storage tank 7 through the second water stop valve 11.2) the outlet 10.1 of the pure water storage tank 10 is connected with the input end of the cold water pump 9 through the first water stop valve 11.1, the output end of the cold water pump 9 ts connected with the pure water inlet 8.2 of the direct-contact membrane distillation device 8, the pure water outlet 83 of the direct-contact membrane distillation device & is connected with the inlet 10.2 of the pure water storage tank 10, and the pure water storage tank 10 also bas a pure water supplement inlet 10.3; when the pure water in the pure water storage tank 10 reaches 30% of the volume of the pure water tank, this batch of pure water will be collected and then replaced with new pure water for pure water extraction again.
In the above technical scheme, it further comprises a conductivity sensor 12 and a temperature sensor 13, wherein the conductivity sensor 12 is used for measuring the conductivity of pure water in the outlet of the pure water storage tank 10, and the temperature sensor 13 is used for measuring the temperature of the desalinated seawater in the desalinated seawater inlet 8.1 of the direct-contact membrane distillation device &.
In the above technical scheme, the temperature sensor 13 measures the water temperatuké/502575 of the desalinated seawater inlet 8.1 in real time, and controls the desalinated seawater healer 6 to keep the water temperature of the desalinated seawater let 8.1 at 65-75°C, At thus temperature, the mass trapsfer rate in the direct-contact membrane distillation process is relatively high, and the energy consumption can be ensured. The pure water temperature at the outlet 10.1 of the pure water storage tank 10 is controlled at 25-30°C, and the temperature control principle is that the pure water storage tank is placed in flowing seawater, directly exchanges heat with seawater, and can be maintained at 25-30°C, When the conductivity of pure water in the outlet 10.1 of the pure water storage tank 10 measured by the conductivity sensor 12 15 higher than 10ps/cm, the membrane in the direct- contact membrane distillation device B is replaced (if the conductivity 1s higher than 1Dus/em, the quality of distilled water fails to meet the standard), and the contaminated membrane is washed with dilute hydrochloric acid, The above-mentioned temperature sensor 13 and conductivity sensor 12 are used to measure the relevant parameters in various places, to determine whether the system is runing in the normal range, and if there is any deficiency or excess of the relevant parameters, the desalinated seawater heater 6 and the direct-coutact membrane distillation device 8 will be adjusted to ensure the normal operation of the system.
In the above technical scheme, the bottom end of the ultrafiltration device 2 is also provided with an outlet 2.3 for discharging filtrate. The ultrafiltration device 2 can filter out large particles and fine particles in seawater.
In the technical scheme, the electrodialysis device 4 is powered by a solar power generation device, and an anion concentration chamber and a cation concentration chamber are separated by an anion exchange membrane 45 and a cation exchange membrane 46, respectively An anode electrode 4.2 15 arranged in the amon concentration chamber, and a cathode electrode 4.3 15 arranged in the cation concentration chamber, An acid chamber is separated in the anton concentration chamber by a bipolar membrane, and an acid solution outlet is arranged in the acid chamber; An alkali chamber is separated in the cation concentration chamber by a bipolar membrane, and an alkali solution outlet is arranged in the alkal chamber; The obtained acid solution {dilute hydrochloric acid} can be used to clean the poliuted membrane, and the obtained alkali solution {sodium hydroxide) can be collected and used,
A desalination chamber is arranged between the anion exchange membrans and the catıd 502575 exchange membrane, and the electrodialysis output end 4.4 of the electrodialysis device is connected with the inlet 7.1 of the desalinated seawater storage tank 7, and the desalinated fresh water is transported into the desalinated seawater storage tank 7.
In the process of electrodialysis, anions move to the anode and cations move to the cathode. In the process of seawater desalination, sodium tons and chionds ions are the main components, So sodium ions flow to the cathode and chloride ions flow to the anode, hydroxide ions will be generated near the cathode and hydrogen tons will be generated near the anode, and sodium hydroxide and hydrogen chioride will be generated at the cathode and anode respectively to form düute alkah solution and acid solution in case that the calcium and magnesium ions in seawater are removed by pretreatment.
In the above technical scheme, the membrane used in the direct-contact membrane distillation device 8 is a hydrophobic hollow fiber membrane, and desalinated seawater flows through the hydrophobic hollow fiber membrane of the direct-contact membrane distillation device 8 tie, the tube pass), and pure water flows in the shell pass of the direct-contact membrane distillation device 8. After water molecules in seawater are converted into water vapor, they can be absorbed by the pure water in the shell pass through the pores of the hydrophobic hollow fiber membrane.
In the above technical scheme, both the electrodialysis device 4 and the pure water storage tank 10 are made of acid and alkali resistant materials, In the above technical scheme, the desalinated seawater heater 6 is a heat exchange device with the heat collected by solar energy and the cold desalinated seawater stock solution.
À method for extracting pure water and concentrating and desalinating seawater by using the system is characterized by comprising the following steps: 1: delivering the raw seawater feed solution to the uitrafiltration device 2 by a stock solution pump to finish the prelinunary pretreatment of seawater, thus filtering out the particulate matter in seawater to obtain filtered seawater, and the filtered waste is subject to centralized treatment; 2: pumping the filtered seawater in the ultrafiltration device 2 with a seawaier pump 3, and sending it into the electrodialysis device 4, wherein the electrodialysis output end 4.4 of the electrodialysis device 4 is connected with the desalted seawater storage tank 7 to deliver the desalted seawater to the desalted seawater storage tank; 3: puroping the desalinated seawater into the desalivated seawater heater 6by the desalinated seawater pump $, heating it to 65-75°C in the desalinated seawater heater 6, and then entering the tube pass part of the direct-contact membrane distillation device 8 from tha)502575 desalinated seawater inlet 8.1, pumping the pure water at 25~30°C into the shell pass part of the direct-contact membrane distillation device 8 by a cold water pump 9 from the outlet 101 of a pure water storage tank 10, and making the desalinated seawater flow through the hydrophobic hollow fiber membrane of the direct-contact membrane distillation device 8 Ge. the tube pass), the pure water at 25-30°C flow in the shell pass of the direct-contact membrane distillation device 8, and the water molecules in the desalinated seawater be absorbed by the pure water at 25~-30°C through the membrane pores after being converted into water vapor, so as to realize the purpose of pure water extraction with the pure water at 25-30°C flowing back to the inlet 10 2 of the pure water storage tank 10; closing the first water stop valve 11 1 in the outlet 10.1 pipeline of the pure water storage tank 10 and the second valve 11.2 in the desalinated seawater circulating reflux inlet 7.3 of the desalinated seawater storage tank 7, thus circulating the pure water at 25-30°C in the pure water storage tank 10 and desalinated seawater; 4: the heating temperature of the desalinated seawater in the above-mentioned circulating treatment process is measured by a temperature sensor 13 connected with the desalinated seawater inlet 8.1 of the direct-contact membrane distillation device 8, and the desalinated seawater heater 6 is controlled to keep the water temperature at the inlet 8.1 of the desalinated seawater at 65.75°C and the pure water temperature at the outlet 10.1 of the pure water storage tank 10 at 25-30°C; the conductivity sensor 12 is used to detect the conductivity of the pure water at the outlet of the pure water storage tank 10, when the conductivity of the pure water is higher than 1Ous/om, the first valve 11.1 and the second valve 11 2 are opened to stop the circulation and clean the hydrophobic hollow fiber membrane with the acid solution generated in the electrodialysis process and replace it after drying.
According to the mvention, solar energy technology 15 used to provide electric energy, and electrodialysis technology is adopted to desalinate the seawater stock solution to obtain desalinated seawater and the generated by-products like dilute acid solution (bydrochionc acid) and dilute alkali solution {sodium hydroxide}. The desalinated seawater 15 subjected to direci- contact membrane distillation, and the desalinated seawater is concentrated while pure water is extracted. The generated dilute acid solution can be used for cleaning membrane components in electrodialysis devices and direct-contact membrane distillation devices, thus greatly reducing the cleaning cost of polluted membranes and prolonging the service life of the system. Therefore, the direct-contact membrane distillation coupled with electrodialysis technology to realize pure water extraction and concentrated seawater desalivation not only achieves the purpose of seawater desalination and pure water extraction, but also achieves the effects of cleaning the polluted membrane by the system itself, prolonging the system life, reducing 1h4)502575 system cost and rationally utilizing natural resources.
Claims (5)
1. À system for extracting pure water and concentrating and desalinating seawater, characterized in that it comprises a stock solution pump (1), an ultrafiiiration device (2), a seawater pump (3) an electrodialysis device (43, a desalinated seawater pump (5), a desalinated seawater heater (63, a desalinated seawater storage tank (7), a direct-contact membrane distillation device (8), a cold water pump (9) and a pure water storage tank (10), wherein, the stock solution pump (1) 18 provided with a raw seawater inlet, the ultrafiltration input end (2.1) of the uitrafiltration device {2} is connected with the outlet of the stock solution pump (1), the ultraiitraton output end (223 of the ultrafiltration device (23 is connecied with the clectrodialysis input end {4.13 of the electrodialysis device (43 through the seawater pump (3), and the electrodialysis output end {4.4} of the electrodialysis device (4) is connected with the inlet (7,13 of desalinated seawater storage tank (7), the outlet (7.2) of the seawater desalination storage tank {7} is connected with the inlet of a seawater desalination heater (6) through the seawater desalination pump (5), and the outlet of the seawater desalination heater (6) 1s connected with the seawater desalination inlet (8.1) of the direct-contact membrane distillation device {8}, the desalinated seawater outlet (8.4) of the direci-contact membrane distillation device {8} is connected with the desalinated seawater circulating reflux inlet (7.33 of the desalinated seawater storage tank (7) through the second water stop valve (11.2), the outlet {10.13 of the pure water storage tank (10) is connected with the input end of the cold water pump (9) through the first water stop valve (11.1), the output end of the cold water pump (9) is connected with the pure water inlet (8.2) of the direct-contact membrane distillation device (63, and the pure water outlet {8.3} of the direct-contact membrane distillation device (8} is connected with the inlet (10.2) of the pure water storage tank (TO)
2. The system for exiracting pure water and concentrating and desalinaling seawater according to claim 1, characterized in that it further comprises a conductivity sensor (12) and a temperature sensor (13), wherein the conductivity sensor (12) is used for measuring the conductivity of pure water in the outlet of the pure water storage tank {10}, and the temperature sensor {13} is used for measuring the desalinated seawater temperature of the desalinated seawater inlet (8.13 of the direct-contact membrane distillation device (83,
3. The system for extracting pure water and concentrating and desalinatine seawater according to claim 2, characterized in that the temperature sensor {13} measures the water temperature of the desalinated seawater inlet (8 1} in real time, and controls the desalinated seawater heater {6} to keep the water temperature of the desalinated seawater inlet (8.1) at 65-
78°C and the pure water temperature of the storage tank outlet {10 1} of the pure water storadééJ502575 tank (10) at 25-30°C, and the temperature control principle is that the pure water storage tank {10} is placed in towing seawater, directly exchanges heat with seawater, and can be maintained at 25-30; when the conductivity of pure water in the outlet {10.1} of the pure water storage tank (10) measured by the conductivity sensor (12) is higher than !Ous/em, the membrane in the direct- contact membrane distillation device (83 is replaced.
4 The system for exiracting pure water and concentrating and desalinaling seawater according to claim 1, characterized in that the bottom end of the ultrafiltration device (231s also provided with an outlet (2.33 for discharging filtrate.
5. The system for extracting pure water and concentrating and desalinating seawater according to claim 1, characterized in that the electrodialysis device (4) 15 powered by a solar power generation device, and an anion concentration chamber and a cation concentration chamber are separated by an anion exchange membrane (4.5) and a cation exchange membrane {4.6}, respectively; an anode electrode (4.24 is arranged in the anon concentration chamber, and a cathode electrode (4.2) is arranged in the cation concentration chamber; an acid chamber is separated in the anon concentration chamber by a bipolar membrane, and an acid solution outlet is arranged in the acid chamber; an alkali chamber is separated in the cation concentration chamber by a bipolar membrane, and an alkali solution outlet is arranged in the alkali chamber; the obtained acid solution can be used to clean the polluted membrane, and the obtained alkali solution can he collected and used; a desalting chamber is arranged between the anton exchange membrane and the cation exchange membrane, and the electrodialysis output end (4.4) of the electrodialysis device is connected with the inlet {7.1} of the desalted seawater storage tank (7), and the desalted fresh water is transported into the desalied seawater storage tank (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU502575A LU502575B1 (en) | 2022-07-27 | 2022-07-27 | System and method for extracting pure water and concentrating and desalinating seawater |
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| Application Number | Priority Date | Filing Date | Title |
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| LU502575A LU502575B1 (en) | 2022-07-27 | 2022-07-27 | System and method for extracting pure water and concentrating and desalinating seawater |
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| LU502575B1 true LU502575B1 (en) | 2023-01-27 |
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| LU502575A LU502575B1 (en) | 2022-07-27 | 2022-07-27 | System and method for extracting pure water and concentrating and desalinating seawater |
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Effective date: 20230127 |