Production system for efficiently extracting industrial brine and fresh water by utilizing seawater

Abstract

The invention relates to the technical field of seawater resource utilization, in particular to a production system for efficiently extracting industrial brine and fresh water by utilizing seawater, which comprises a seawater taking device, an air flotation device, an ultrafiltration device and a fresh water treatment device which are arranged above the ground, and further comprises a deep well potential energy reverse osmosis device arranged below the ground, the seawater taking device, the air floatation device and the ultrafiltration device are sequentially communicated, the ultrafiltration device is communicated with the deep well potential energy reverse osmosis device, the deep well potential energy reverse osmosis device is communicated with the fresh water treatment device, and a dosing device matched with the seawater taking device is further arranged above the ground.

Description

Technical Field

[0001] This invention relates to the field of seawater resource utilization technology, specifically a production system for efficiently extracting industrial brine and freshwater from seawater. Background Technology

[0002] Seawater contains abundant chemical elements. To extract these chemical elements from seawater, industrial brine must first be extracted. The higher the concentration of industrial brine, the higher the extraction efficiency. Generally, the TDS (Total Dissolved Solids) of industrial brine is required to be >80,000 ppm, that is, the total dissolved solids account for >8% of the brine. Then, industrial raw materials such as sodium chloride, magnesium chloride, magnesium sulfate, potassium, lithium, bromine, and salts are extracted from it. Industrial brine is a raw material needed by many fine chemical and salt chemical industries. Therefore, extracting industrial brine from seawater is of great significance for obtaining a variety of chemical raw materials.

[0003] Traditionally, the chemical industry uses brine by extracting underground brine. Underground brine is formed over a long period of time under specific geological conditions and has limited reserves. In recent years, with the booming development of the chemical industry, the demand for industrial brine has increased significantly. Underground brine has been over-exploited, and unreasonable extraction has caused impurities or fresh water to mix into the brine layer, resulting in a decline in quality and affecting its industrial utilization value. This has seriously led to resource depletion and affected the sustainable development of industries that rely on brine resources.

[0004] Meanwhile, excessive extraction of underground brine has caused the groundwater level to drop in some coastal areas, forming a drawdown funnel, which leads to strata compression and subsequent ground subsidence. This damages surface buildings, roads, and underground pipe networks, alters the underground stress balance, and increases the risk of geological disasters such as earthquakes and ground fissures, threatening the geological safety of surrounding areas.

[0005] The impact on the ecological environment is also very serious. During the mining process, some enterprises have leaked brine or improperly discharged it, causing soil salinization around the mining area, which leads to difficulties in vegetation growth, desertification, and disruption of the ecological balance. The high salinity of the brine and the possible presence of heavy metals and other harmful substances, if not properly developed, can seep into groundwater, pollute groundwater quality, and affect the groundwater supply security and aquatic ecosystem of the surrounding areas.

[0006] Traditional methods for extracting brine from seawater include solar radiation evaporation, low-temperature freezing, ion exchange, and forward osmosis membrane separation. These methods are time-consuming, inefficient, and subject to limitations imposed by the production environment, weather, and temperature. They also produce brine with excessive impurities, affecting its usability. Traditional seawater brine extraction technologies suffer from high costs, low efficiency, and resource waste. For example, without high-power, high-flow-rate high-pressure seawater pumps, brine produced using low-pressure pumps needs to be placed in ponds and evaporated under sunlight to reach a certain Baume degree before use, resulting in a lengthy production cycle. Some techniques also generate large amounts of waste liquid during extraction, impacting the environment, and fail to fully utilize the various beneficial components in seawater.

[0007] Reverse osmosis requires a pressure of at least 7 MPa to produce concentrated brine with a TDS of over 80,000 ppm, necessitating the use of electrically powered high-pressure pumps. Currently, there are no high-flow-rate, high-power seawater high-pressure pumps available domestically or internationally. Achieving a driving pressure of over 7 MPa requires multi-stage linkage, consuming vast amounts of electricity and resulting in extremely high energy costs. This makes the produced brine prohibitively expensive for chemical companies using it. Therefore, there are no precedents for using reverse osmosis for brine extraction, either domestically or internationally. Summary of the Invention

[0008] The purpose of this invention is to provide a production system for efficiently extracting industrial brine and freshwater from seawater. This system can effectively improve the extraction efficiency of brine, reduce production costs, and at the same time, the discharged freshwater can be further processed to produce industrial water or drinking water for residents, thus solving the freshwater resource crisis and realizing the comprehensive utilization of seawater resources.

[0009] A production system for efficiently extracting industrial brine and freshwater from seawater includes a seawater intake device, an air flotation device, an ultrafiltration device, and a freshwater treatment device installed above ground, and a deep well potential energy reverse osmosis device installed below ground. The seawater intake device, air flotation device, and ultrafiltration device are connected in sequence. The ultrafiltration device is connected to the deep well potential energy reverse osmosis device, and the deep well potential energy reverse osmosis device is connected to the freshwater treatment device. A dosing device that works in conjunction with the seawater intake device is also installed above ground.

[0010] Furthermore, the seawater intake device includes an electric bar screen, the outlet of which is connected to the inlet of the seawater buffer tank, the outlet of which is connected to the inlet of the seawater storage tank, the outlet of which is connected to the air flotation device via a seawater delivery pipe, a seawater pump is installed on the seawater delivery pipe, and the dosing device is connected to the seawater buffer tank.

[0011] Furthermore, the flotation device includes a flotation machine, a flotation water storage tank, a scum tank, a scum thickening tank, and a belt filter press. The inlet end of the flotation machine is connected to a seawater delivery pipe, and the outlet end of the flotation machine is connected to the flotation water storage tank via a flotation water delivery pipe. The flotation water storage tank is connected to an ultrafiltration device. A flotation water shut-off valve is installed on the flotation water delivery pipe. The scum discharge end of the flotation machine is connected to the scum tank. The scum tank is connected to the scum thickening tank via a scum delivery pipe. A spiral sludge pump is installed on the scum delivery pipe. The scum thickening tank is connected to the belt filter press via a spiral conveyor.

[0012] Furthermore, the ultrafiltration device includes a security filter, an intermediate water tank, and a UF ultrafiltration membrane module. The inlet of the security filter is connected to the air flotation water storage tank through a security filter inlet pipe, and a security filter inlet pump is installed on the security filter inlet pipe. The outlet of the security filter is connected to the intermediate water tank through a security filter outlet pipe, and a security filter outlet shut-off valve is installed on the security filter outlet pipe. The intermediate water tank is connected to the inlet of the UF ultrafiltration membrane module through a UF ultrafiltration inlet pipe, and a UF ultrafiltration inlet pump is installed on the UF ultrafiltration inlet pipe. The outlet of the UF ultrafiltration membrane module is connected to a deep well potential energy reverse osmosis device through a UF ultrafiltration outlet pipe.

[0013] Furthermore, the deep well potential energy reverse osmosis device includes a raw water well and a reverse osmosis membrane module. The lower part of the raw water well is connected to the inlet end of the reverse osmosis membrane module through a reverse osmosis inlet pipe. A reverse osmosis inlet pressure regulating valve is installed on the reverse osmosis inlet pipe. The clear water outlet end of the reverse osmosis membrane module is connected to an underground clear water tank through a reverse osmosis clear water outlet pipe. The underground clear water tank is connected to a freshwater treatment device through a clear water pipeline. The brine outlet end of the reverse osmosis membrane module is connected to a surface brine tank through a reverse osmosis brine outlet pipe. A brine booster pump is installed on the reverse osmosis brine outlet pipe.

[0014] Furthermore, the freshwater treatment device includes a surface clear water tank, a BWRO membrane module, a limestone mineralization tank, a pH adjustment tank, an ultraviolet disinfection tank, an air compressor, and a freshwater tank. The clear water pipeline is connected to the surface clear water tank and is equipped with a clear water booster pump. The surface clear water tank is connected to the inlet of the BWRO membrane module via a BWRO inlet pipe and is equipped with a BWRO inlet booster pump. The limestone mineralization tank, pH adjustment tank, and ultraviolet disinfection tank are connected sequentially via pipelines. The ultraviolet disinfection tank and the freshwater tank are connected via a freshwater pipe and are equipped with a freshwater pipe shut-off valve. The outlet of the BWRO membrane module is connected to the inlet of the limestone mineralization tank via a BWRO outlet pipe. The outlet of the air compressor is connected to the limestone mineralization tank and the pH adjustment tank.

[0015] Furthermore, the dosing device includes a sodium hypochlorite storage tank, which is connected to a seawater buffer tank via a dosing pipe, and a dosing pump is installed on the dosing pipe.

[0016] Furthermore, the wastewater end of the UF ultrafiltration membrane module is connected to the inlet end of the air flotation machine via a wastewater pipe, and the drainage ends of the scum thickening tank and the belt filter press are both connected to the wastewater pipe.

[0017] Furthermore, the wastewater end of the security filter is connected to the wastewater tank through the security filter wastewater pipe, and the wastewater end of the BWRO membrane module is connected to the wastewater tank through the BWRO wastewater pipe.

[0018] In summary, the present invention has the following beneficial effects: 1. This invention utilizes a deep well potential energy reverse osmosis device, saving on electrical power consumption, and the production cost of brine preparation from seawater is lower than the cost of extracting underground brine; 2. The natural potential energy pressure from the depth of the raw water well replaces the electrical energy of the high-pressure pump. The raw water well is a structure combining reinforced concrete and metal, which is a one-time investment with a service life of up to 100 years, requiring no maintenance or equipment replacement. The potential energy of the deep well is natural potential energy, with stable pressure and significantly improved treatment efficiency. It also protects the reverse osmosis membrane, extending its service life by 2-3 years, and improves the system's operational capacity, reducing equipment maintenance and replacement, and saving on the production costs of brine and freshwater. 3. The deep well potential energy reverse osmosis device is set up underground, which saves land resources. The underground temperature is uniform and the environment is closed. There is no need for heating and noise reduction facilities, which saves investment and construction costs as well as daily operating costs for heating and noise reduction, and reduces water production costs. 4. It protects the ecological environment and avoids the damage to the ecological environment caused by the extraction of underground brine; 5. The system is rationally designed, highly automated, easy to operate, and easy to implement for industrial production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a production system for efficiently extracting industrial brine and freshwater from seawater according to the present invention.

[0020] In the diagram: 1. Electric bar screen; 2. Seawater buffer tank; 3. Seawater storage tank; 4. Seawater delivery pipe; 5. Seawater pump; 6. Sodium hypochlorite storage tank; 7. Dosing pipe; 8. Dosing pump; 9. Air flotation unit; 10. Air flotation water storage tank; 11. Air flotation water delivery pipe; 12. Air flotation water shut-off valve; 13. Scum tank; 14. Scum delivery pipe; 15. Spiral sludge pump; 16. Scum thickening tank; 17. Spiral conveyor; 18. Belt filter press; 19. Security filter; 20. Security filter inlet pipe; 21. Security filter inlet pump; 22. Security filter outlet pipe; 23. Security filter outlet shut-off valve; 24. Intermediate water tank; 25. UF ultrafiltration membrane module; 26. UF ultrafiltration inlet pipe; 27. UF ultrafiltration inlet pump; 28. UF ultrafiltration outlet pipe. 29 Wastewater pipe, 30 Security filter sewage pipe, 31 Sewage tank, 32 Raw water well, 33 Reverse osmosis membrane module, 34 Reverse osmosis inlet pipe, 35 Reverse osmosis inlet pressure regulating valve, 36 Reverse osmosis clean water outlet pipe, 37 Underground clean water tank, 38 Clean water pipe, 39 Reverse osmosis brine outlet pipe, 40 Ground brine tank, 41 Clean water lift pump, 42 Ground clean water tank, 43 BWRO membrane module, 44 BWRO inlet pipe, 45 BWRO inlet booster pump, 46 Limestone mineralization tank, 47 pH adjustment tank, 48 Ultraviolet disinfection tank, 49 Air compressor, 50 Freshwater pipe, 51 Freshwater tank, 52 Freshwater pipe shut-off valve, 53 BWRO outlet pipe, 54 BWRO sewage pipe, 55 Brine booster pump. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The following is in conjunction with the appendix Figure 1 The present invention will be further described as follows: A production system for efficiently extracting industrial brine and freshwater from seawater includes a seawater intake device, an air flotation device, an ultrafiltration device, and a freshwater treatment device installed above ground, and a deep well potential energy reverse osmosis device installed below ground. The seawater intake device, air flotation device, and ultrafiltration device are connected in sequence. The ultrafiltration device is connected to the deep well potential energy reverse osmosis device, and the deep well potential energy reverse osmosis device is connected to the freshwater treatment device. A dosing device that works in conjunction with the seawater intake device is also installed above ground.

[0023] In this embodiment, a seawater intake device draws and performs primary treatment of seawater. A dosing device disinfects and sterilizes the seawater to minimize the invasion of microorganisms and bacteria into subsequent equipment. An air flotation device separates and treats suspended solids and impurities in the seawater. An ultrafiltration device reduces the content of impurities such as large molecular organic matter and colloidal silica in the seawater. A deep-well potential energy reverse osmosis device uses natural potential energy pressure instead of the power required for water treatment, saving the consumption of water pumps and electrical energy. It adopts the principle of reverse osmosis membrane seawater desalination technology to extract industrial brine and produce freshwater simultaneously. The freshwater treatment device meets drinking water standards through deep desalination, deboronization, mineralization, and pH adjustment.

[0024] The seawater intake device includes an electric bar screen 1, the outlet of which is connected to the inlet of a seawater buffer tank 2, the outlet of which is connected to the inlet of a seawater storage tank 3, and the outlet of which is connected to an air flotation device via a seawater delivery pipe 4. A seawater pump 5 is installed on the seawater delivery pipe 4. A dosing device is connected to the seawater buffer tank 2 and includes a sodium hypochlorite storage tank 6. The sodium hypochlorite storage tank 6 is connected to the seawater buffer tank 2 via a dosing pipe 7 and a dosing pump 8 is installed on the dosing pipe 7.

[0025] In this embodiment, seawater from the ocean is transported to an electric bar screen 1 for initial screening to remove a large amount of floating debris. The pre-treated seawater flows into a seawater buffer tank 2. A dosing pump 8 adds sodium hypochlorite from a sodium hypochlorite storage tank 6 into the seawater buffer tank 2 through a dosing pipe 7 to disinfect and sterilize the seawater, ensuring that subsequent equipment is less susceptible to microbial and bacterial invasion. The disinfected seawater flows into a seawater storage tank 3 for sedimentation. A seawater pump 5 transports the seawater from the storage tank 3 to the air flotation device through a seawater delivery pipe 4.

[0026] The flotation device includes a flotation machine 9, a flotation water storage tank 10, a scum tank 13, a scum thickening tank 16, and a belt filter press 18. The inlet end of the flotation machine 9 is connected to the seawater delivery pipe 4, and the outlet end of the flotation machine 9 is connected to the flotation water storage tank 10 through the flotation water delivery pipe 11. The flotation water storage tank 10 is connected to the ultrafiltration device. A flotation water shut-off valve 12 is installed on the flotation water delivery pipe 11. The scum discharge end of the flotation machine 9 is connected to the scum tank 13. The scum tank 13 is connected to the scum thickening tank 16 through the scum delivery pipe 14. A spiral sludge pump 15 is installed on the scum delivery pipe 14. The scum thickening tank 16 is connected to the belt filter press 18 through a spiral conveyor 17.

[0027] In this embodiment, suspended solids and impurities in seawater are separated. The suspended solids, impurities, and a portion of the seawater enter the scum pond 13. The spiral sludge pump 15 transports the suspended solids, impurities, and a portion of the seawater from the upper part of the scum pond 13 to the scum thickening tank 16 via the scum conveying pipe 14. The spiral conveyor 17 lifts the suspended solids and impurities in the scum thickening tank 16 to the belt filter press 18 to be pressed into sludge cakes. The seawater treated by the air flotation machine 9 enters the air flotation water storage tank 10 through the air flotation water conveying pipe 11.

[0028] The ultrafiltration unit includes a security filter 19, an intermediate water tank 24, and a UF ultrafiltration membrane module 25. The inlet of the security filter 19 is connected to the air flotation water storage tank 10 through a security filter inlet pipe 20. A security filter inlet pump 21 is installed on the security filter inlet pipe 20. The outlet of the security filter 19 is connected to the intermediate water tank 24 through a security filter outlet pipe 22. A security filter outlet shut-off valve 23 is installed on the security filter outlet pipe 22. The intermediate water tank 24 is connected to the UF ultrafiltration inlet pipe 26. The inlet of the UF ultrafiltration membrane module 25 is connected to the inlet of the UF ultrafiltration inlet pipe 26, and the UF ultrafiltration inlet pump 27 is installed on the UF ultrafiltration inlet pipe 26. The outlet of the UF ultrafiltration membrane module 25 is connected to the deep well potential energy reverse osmosis device through the UF ultrafiltration outlet pipe 28. The sewage end of the security filter 19 is connected to the sewage tank 31 through the security filter sewage pipe 30. The wastewater end of the UF ultrafiltration membrane module 25 is connected to the inlet of the air flotation machine 9 through the wastewater pipe 29. The outlets of the scum thickening tank 16 and the belt filter press 18 are both connected to the wastewater pipe 29.

[0029] In this embodiment, the security filter inlet pump 21 transports seawater from the air flotation water storage tank 10 to the security filter 19 through the security filter inlet pipe 20. The security filter 19 performs solid-liquid separation on various suspended solids in the seawater. The seawater treated by the security filter 19 enters the intermediate water tank 24 for storage through the security filter outlet pipe 22. The wastewater treated by the security filter 19 enters the wastewater tank 31 for collection through the security filter wastewater pipe 30.

[0030] The UF ultrafiltration feed pump 27 transports seawater from the intermediate water tank 24 to the UF ultrafiltration membrane module 25 through the UF ultrafiltration feed pipe 26. The UF ultrafiltration membrane module 25 decolorizes, removes impurities, and classifies the seawater. The treated seawater then enters the deep well reverse osmosis unit. The wastewater treated by the UF ultrafiltration membrane module 25 enters the flotation unit 9 for further treatment through the wastewater pipe 29. The seawater concentrated and filtered by the scum thickener 16 and belt filter press 18 also enters the flotation unit 9 for further treatment through the wastewater pipe 29.

[0031] The deep well potential energy reverse osmosis device includes a raw water well 32 and a reverse osmosis membrane module 33. The lower part of the raw water well 32 is connected to the inlet end of the reverse osmosis membrane module 33 through a reverse osmosis inlet pipe 34. A reverse osmosis inlet pressure regulating valve 35 is installed on the reverse osmosis inlet pipe 34. The clear water outlet end of the reverse osmosis membrane module 33 is connected to an underground clear water tank 37 through a reverse osmosis clear water outlet pipe 36. The underground clear water tank 37 is connected to a freshwater treatment device through a clear water pipe 38. The brine outlet end of the reverse osmosis membrane module 33 is connected to a surface brine tank 40 through a reverse osmosis brine outlet pipe 39. A brine booster pump 55 is installed on the reverse osmosis brine outlet pipe 39.

[0032] In this embodiment, seawater treated by the UF ultrafiltration membrane module 25 enters the raw water well 32. The seawater in the raw water well 32 is forced into the reverse osmosis membrane module 33 by the natural potential energy pressure generated by the depth of the raw water well 32, replacing the power required for water treatment. Utilizing the characteristics of the reverse osmosis membrane, the seawater uses the pressure difference as the driving force to separate solutes such as salts from the water. When a pressure greater than the osmotic pressure is applied to the seawater side, the flow direction of water molecules reverses, flowing from the seawater side through the semi-permeable membrane to the freshwater side. Solutes such as salt ions are retained on the seawater side, thus achieving the separation of brine and fresh water in the seawater. By equipping the raw water well 32 with an appropriate depth, the natural potential energy generated by the depth of the raw water well 32 meets the pressure requirements of the reverse osmosis membrane module 33 for the separation of brine and fresh water.

[0033] The brine booster pump 55 pumps the separated brine into the ground brine tank 40 through the reverse osmosis brine outlet pipe 39.

[0034] Because seawater enters the reverse osmosis membrane module 33 under high pressure from the raw water well 32, the separated clean water is still highly saline and needs to be treated again by a desalination plant to obtain fresh water. The clean water flows into the underground clean water tank 37 through the reverse osmosis clean water outlet pipe 36, and the clean water in the underground clean water tank 37 enters the desalination plant through the clean water pipe 38.

[0035] The freshwater treatment unit includes a surface clear water tank 42, a BWRO membrane module 43, a limestone mineralization tank 46, a pH adjustment tank 47, an ultraviolet disinfection tank 48, an air compressor 49, and a freshwater tank 51. A clear water pipeline 38 connects to the surface clear water tank 42, and a clear water booster pump 41 is installed on the clear water pipeline 38. The surface clear water tank 42 is connected to the inlet of the BWRO membrane module 43 via a BWRO inlet pipe 44, and a BWRO inlet booster pump 45 is installed on the BWRO inlet pipe 44. The limestone mineralization tank 46, pH adjustment tank 47, ultraviolet disinfection tank 48, air compressor 49, and freshwater tank 51 are also included. The pH adjustment tank 47 and the ultraviolet disinfection tank 48 are connected in sequence by pipes. The ultraviolet disinfection tank 48 and the freshwater tank 51 are connected by a freshwater pipe 50. A freshwater pipe shut-off valve 52 is installed on the freshwater pipe 50. The outlet of the BWRO membrane module 43 is connected to the inlet of the limestone mineralization tank 46 through the BWRO outlet pipe 53. The outlet of the air compressor 49 is connected to the limestone mineralization tank 46 and the pH adjustment tank 47. The wastewater end of the BWRO membrane module 43 is connected to the wastewater tank 31 through the BWRO wastewater pipe 54.

[0036] In this embodiment, the clean water lift pump 41 pumps clean water from the underground clean water tank 37 into the surface clean water tank 42 via the clean water pipe 38. The BWRO inlet booster pump 45 transports the clean water from the surface clean water tank 42 to the BWRO membrane module 43 for treatment via the BWRO inlet pipe 44. The BWRO membrane module 43 absorbs the salt in the clean water, desalinating it to form fresh water. The wastewater treated by the BWRO membrane module 43 is collected in the wastewater tank 31 via the BWRO wastewater pipe 54.

[0037] The freshwater treated by the BWRO membrane module 43 undergoes further mineralization, pH adjustment, and disinfection in a limestone mineralization tank 46, a pH adjustment tank 47, and an ultraviolet disinfection tank 48, resulting in drinking water that meets drinking standards. The drinking water is then piped into a freshwater tank 51 via a freshwater pipe 50. Preferably, an air compressor 49 can be installed to improve the water treatment efficiency of the limestone mineralization tank 46 and the pH adjustment tank 47.

[0038] In summary, this invention is not limited to the specific embodiments described above. Those skilled in the art can make various modifications and alterations without departing from the spirit and scope of this invention. The scope of protection of this invention should be determined by the claims of this invention.

[0039] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0040] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

Claims

1. A production system for efficiently extracting industrial brine and freshwater from seawater, characterized in that, The system includes a seawater intake device, an air flotation device, an ultrafiltration device, and a freshwater treatment device installed above ground, as well as a deep well potential energy reverse osmosis device installed below ground. The seawater intake device, air flotation device, and ultrafiltration device are connected in sequence. The ultrafiltration device is connected to the deep well potential energy reverse osmosis device, and the deep well potential energy reverse osmosis device is connected to the freshwater treatment device. A dosing device that works in conjunction with the seawater intake device is also installed above ground.

2. The production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 1, characterized in that, The seawater intake device includes an electric bar screen (1), the outlet of which is connected to the inlet of a seawater buffer tank (2), the outlet of which is connected to the inlet of a seawater storage tank (3), the outlet of which is connected to the air flotation device via a seawater delivery pipe (4), a seawater pump (5) is installed on the seawater delivery pipe (4), and the dosing device is connected to the seawater buffer tank (2).

3. The production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 2, characterized in that, The flotation device includes a flotation machine (9), a flotation water storage tank (10), a scum pond (13), a scum thickening tank (16), and a belt filter press (18). The inlet end of the flotation machine (9) is connected to the seawater delivery pipe (4), and the outlet end of the flotation machine (9) is connected to the flotation water storage tank (10) through the flotation water delivery pipe (11). The flotation water storage tank (10) is connected to the ultrafiltration device. A flotation water shut-off valve (12) is installed on the flotation water delivery pipe (11). The scum discharge end of the flotation machine (9) is connected to the scum pond (13). The scum pond (13) is connected to the scum thickening tank (16) through the scum delivery pipe (14). A spiral sludge pump (15) is installed on the scum delivery pipe (14). The scum thickening tank (16) is connected to the belt filter press (18) through a spiral conveyor (17).

4. The production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 3, characterized in that, The ultrafiltration device includes a security filter (19), an intermediate water tank (24), and a UF ultrafiltration membrane module (25). The inlet of the security filter (19) is connected to the air flotation water storage tank (10) through the security filter inlet pipe (20). A security filter inlet pump (21) is installed on the security filter inlet pipe (20). The outlet of the security filter (19) is connected to the intermediate water tank (24) through the security filter outlet pipe (22). A security filter outlet shut-off valve (23) is installed on the security filter outlet pipe (22). The intermediate water tank (24) is connected to the inlet of the UF ultrafiltration membrane module (25) through the UF ultrafiltration inlet pipe (26). A UF ​​ultrafiltration inlet pump (27) is installed on the UF ultrafiltration inlet pipe (26). The outlet of the UF ultrafiltration membrane module (25) is connected to the deep well potential energy reverse osmosis device through the UF ultrafiltration outlet pipe (28).

5. A production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 4, characterized in that, The deep well potential energy reverse osmosis device includes a raw water well (32) and a reverse osmosis membrane module (33). The lower part of the raw water well (32) is connected to the inlet end of the reverse osmosis membrane module (33) through a reverse osmosis inlet pipe (34). A reverse osmosis inlet pressure regulating valve (35) is installed on the reverse osmosis inlet pipe (34). The clear water outlet end of the reverse osmosis membrane module (33) is connected to an underground clear water pool (37) through a reverse osmosis clear water outlet pipe (36). The underground clear water pool (37) is connected to a freshwater treatment device through a clear water pipe (38). The brine outlet end of the reverse osmosis membrane module (33) is connected to a surface brine pool (40) through a reverse osmosis brine outlet pipe (39). A brine booster pump (55) is installed on the reverse osmosis brine outlet pipe (39).

6. The production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 5, characterized in that, The freshwater treatment device includes a surface clear water tank (42), a BWRO membrane module (43), a limestone mineralization tank (46), a pH adjustment tank (47), an ultraviolet disinfection tank (48), an air compressor (49), and a freshwater tank (51). The clear water pipeline (38) is connected to the surface clear water tank (42), and a clear water lift pump (41) is installed on the clear water pipeline (38). The surface clear water tank (42) is connected to the inlet end of the BWRO membrane module (43) through a BWRO inlet pipe (44), and a BWRO inlet valve is installed on the BWRO inlet pipe (44). The booster pump (45), the limestone mineralization tank (46), the pH adjustment tank (47) and the ultraviolet disinfection tank (48) are connected in sequence through pipelines. The ultraviolet disinfection tank (48) and the freshwater tank (51) are connected through a freshwater pipe (50). A freshwater pipe shut-off valve (52) is installed on the freshwater pipe (50). The outlet end of the BWRO membrane module (43) is connected to the inlet end of the limestone mineralization tank (46) through the BWRO outlet pipe (53). The outlet end of the air compressor (49) is connected to the limestone mineralization tank (46) and the pH adjustment tank (47).

7. A production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 6, characterized in that, The dosing device includes a sodium hypochlorite storage tank (6), which is connected to the seawater buffer tank (2) via a dosing pipe (7), and a dosing pump (8) is installed on the dosing pipe (7).

8. A production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 4, characterized in that, The wastewater end of the UF ultrafiltration membrane module (25) is connected to the inlet end of the air flotation machine (9) through the wastewater pipe (29), and the drainage ends of the scum thickening tank (16) and the belt filter press (18) are both connected to the wastewater pipe (29).

9. A production system for efficiently extracting industrial brine and freshwater from seawater as described in claim 6, characterized in that, The wastewater end of the security filter (19) is connected to the wastewater tank (31) through the security filter wastewater pipe (30), and the wastewater end of the BWRO membrane module (43) is connected to the wastewater tank (31) through the BWRO wastewater pipe (54).

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