High-salt concentrated water filtering system
By combining a reverse osmosis system with a reprocessing system, along with energy recovery and crystallization technologies, the problems of scaling and high energy consumption in RO components during high-salt wastewater treatment have been solved, achieving a highly efficient water recovery and low-energy water treatment process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-03-24
AI Technical Summary
Existing high-salt wastewater treatment methods result in severe scaling of RO components, and require a large amount of water for evaporation and crystallization, leading to high energy consumption and low water recovery rate.
The system combines a reverse osmosis system, a reprocessing system, and an evaporation crystallization system. By connecting reverse osmosis components in series and filtering concentrated water through the reprocessing system, a closed-loop water treatment process is formed. An energy recovery system is used to drive the flow of reprocessed water, removing scale-causing ions and forming solid particles.
It significantly improves the water recovery rate, reduces the amount of water evaporated and crystallized, lowers energy consumption, extends the service life of the reverse osmosis membrane, and enhances the water purification rate and the system's economy.
Smart Images
Figure CN121717440A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of water filtration technology, specifically relating to a high-salt concentrated water filtration system. Background Technology
[0002] Industries such as coal chemical, petrochemical, power, and pharmaceutical manufacturing generate large amounts of high-salinity wastewater. Related technologies typically treat this wastewater using a "pretreatment-membrane concentration-evaporation crystallization" process. To improve water recovery rates, multiple RO (reverse osmosis) modules are often connected in series. However, this can lead to severe scaling on the downstream RO modules. Furthermore, in these technologies, the concentrated water from the downstream RO modules is directly evaporated and crystallized, resulting in a large volume of water requiring treatment and increased energy consumption. Summary of the Invention
[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a high-salt concentrate filtration system that reduces scaling in the second-stage reverse osmosis component and improves the overall water recovery rate.
[0004] The high-salt concentrate filtration system of this invention includes a reverse osmosis system, a retreatment system, and an evaporation crystallization system. The reverse osmosis system includes multiple reverse osmosis components connected in series. The downstream reverse osmosis component in a pair of adjacent reverse osmosis components is used to filter the concentrate produced by the upstream reverse osmosis component. The retreatment system is connected to the reverse osmosis system and is used to filter the concentrate produced by any of the reverse osmosis components and produce retreated water. The retreated water can be transported to the reverse osmosis system and mixed with the concentrate produced by any of the reverse osmosis components. The evaporation crystallization system is connected to the reverse osmosis system and is used to evaporate and crystallize the concentrate produced by any of the reverse osmosis components.
[0005] The high-salt concentrated water filtration system of this invention organically combines a reverse osmosis system, a reprocessing system, and an evaporation crystallization system to construct a highly efficient, closed-loop water treatment process. It significantly improves the overall water recovery rate, reduces the amount of water required for final evaporation crystallization, thereby greatly reducing the load and overall operating cost of the energy-intensive evaporation crystallization system. Furthermore, the reprocessing system dilutes the feed water concentration to the downstream reverse osmosis components, reducing the pressure on the reverse osmosis components and improving the water purification rate.
[0006] In some embodiments, the reprocessing system includes a crystallizer and a direct filtration system. The crystallizer is connected to the reverse osmosis system for separating scale-causing ions from the concentrate produced by at least one of the reverse osmosis components and producing primary water. The direct filtration system is connected to the crystallizer and the reverse osmosis system for filtering the primary water and producing the reprocessed water.
[0007] In some embodiments, the crystallizer includes at least one of a fluidized bed granulation crystallizer, an Oslo crystallizer, or a DTB crystallizer, which allows the scale-causing ions in the concentrate within it to form solid particles and be separated.
[0008] In some embodiments, the direct filtration system includes a filter membrane column with a filtration accuracy of 0.1-10 μm, the filter membrane column being used to filter the primary water and retain the solid particles remaining in the primary water.
[0009] In some embodiments, the plurality of reverse osmosis components include a first reverse osmosis component and a second reverse osmosis component, wherein the concentrate produced by the second reverse osmosis component can be diverted to the crystallizer and the evaporation crystallization system, and the reprocessed water is mixed with the concentrate produced by the first reverse osmosis component and then sent to the second reverse osmosis component for filtration.
[0010] In some embodiments, the reverse osmosis assembly includes a plurality of reverse osmosis membrane modules arranged in parallel, each reverse osmosis module containing a plurality of reverse osmosis membrane units, wherein the number of reverse osmosis membrane units in the first reverse osmosis assembly is C, the number of reverse osmosis membrane units in the second reverse osmosis assembly is D, and the range of C:D is between 2:1 and 1:1.
[0011] In some embodiments, the high-salt concentrate filtration system further includes an energy recovery system connected to the reverse osmosis system and the reprocessing system, wherein the energy recovery system can use the concentrate produced by the reverse osmosis system to drive the flow of the reprocessed water.
[0012] In some embodiments, the energy recovery system includes a first flow channel, a second flow channel, and a mechanical drive component. The concentrate produced by the second reverse osmosis component flows into the first flow channel and is then diverted through the first flow channel to the crystallizer and the evaporation crystallization system. The retreated water is transported through the second flow channel to the reverse osmosis system and mixed with the concentrate produced by the first reverse osmosis component. The mechanical drive component is connected to the first flow channel and the second flow channel. Fluid in the first flow channel can drive the mechanical drive component to operate, and the mechanical drive component can drive the fluid flow in the second flow channel.
[0013] In some embodiments, the flow rate of concentrated water diverted to the crystallizer is A, and the flow rate of concentrated water diverted to the evaporation crystallization system is B, where A / B = 0.25-1.
[0014] In some embodiments, the purity of the solid particulate matter is not less than 95%.
[0015] In some embodiments, the high-salt concentrate filtration system further includes at least one of a water pump, a valve, a pressure gauge, a flow meter, and a hardness tester, wherein at least one of the water pump, the valve, the pressure gauge, the flow meter, and the hardness tester is located upstream of the reverse osmosis system or between any two of the reverse osmosis system, the evaporation crystallization system, the reprocessing system, and the energy recovery system.
[0016] The high-salt concentrate filtration system of this invention directly reduces the amount of water entering the evaporation and crystallization system by improving the recovery rate of the reverse osmosis system. Evaporation and crystallization is the most energy-intensive unit in the entire system, thus resulting in the most significant operating cost savings. The energy recovery system directly uses the residual pressure energy of the high-pressure concentrate produced by the reverse osmosis module to drive the delivery of reprocessed water, effectively reducing the system's pumping energy consumption. The system, through the reprocessing system (crystallizer + direct filtration system), specifically removes scale-causing ions such as calcium, magnesium, and sulfate from the concentrate, converting them into solid particles for separation, thus mitigating scaling in the second-stage reverse osmosis module. Attached Figure Description
[0017] Figure 1 This is an overall schematic diagram of the high-salt concentrated water filtration system according to an embodiment of the present invention.
[0018] Figure label: 1. Reverse osmosis system; Reverse osmosis module 1, first reverse osmosis module; Reverse osmosis module 2, second reverse osmosis module; Reverse osmosis module 0, reverse osmosis membrane module; 2. Evaporation and crystallization system; 3. Reprocessing system; 31. Crystallizer; 32. Direct filtration system; 321. Filter membrane column; 4. Energy recovery system; 5. Water pump; 6. Valves; 7. Pressure gauge; 8. Flow meter; 9. Hardness tester. Detailed Implementation
[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0020] like Figure 1As shown, the high-salt concentrate filtration system of this invention includes a reverse osmosis system 1, a reprocessing system 3, and an evaporation crystallization system 2. The reverse osmosis system 1 includes multiple reverse osmosis components connected in series. The downstream reverse osmosis component in two adjacent reverse osmosis components is used to filter the concentrate produced by the upstream reverse osmosis component. The reprocessing system 3 is connected to the reverse osmosis system 1 and is used to filter the concentrate produced by any reverse osmosis component and produce reprocessed water. The reprocessed water can be transported to the reverse osmosis system 1 and mixed with the concentrate produced by any reverse osmosis component. The evaporation crystallization system 2 is connected to the reverse osmosis system 1 and is used to evaporate and crystallize the concentrate produced by any reverse osmosis component.
[0021] The high-salt concentrate filtration system of this invention organically combines a reverse osmosis system 1, a retreatment system 3, and an evaporation crystallization system 2 to construct a highly efficient, closed-loop water treatment process. It significantly improves the overall water recovery rate, reduces the amount of water required for final evaporation crystallization, thereby greatly reducing the load and overall operating cost of the energy-intensive evaporation crystallization system 2. Furthermore, the retreatment process removes scale-causing ions from the concentrate, and the resulting retreated water dilutes the feed water concentration of the downstream reverse osmosis module, reducing the pressure on the reverse osmosis module, alleviating structural stress on the downstream reverse osmosis module, and improving the water purification rate.
[0022] In some embodiments, the reprocessing system 3 includes a crystallizer 31 and a direct filtration system 32. The crystallizer 31 is connected to the reverse osmosis system 1 and is used to separate scale-causing ions from the concentrate produced by at least one of the reverse osmosis components and produce primary water. The direct filtration system 32 is connected to the crystallizer 31 and the reverse osmosis system 1 and is used to filter the primary water and produce reprocessed water.
[0023] The reprocessing system 3 in the high-salt concentrate filtration system of this invention mainly consists of a crystallizer 31 and a direct filtration system 32 connected in series. Concentrate from the reverse osmosis system 1 first enters the crystallizer 31. In this unit, by controlling conditions such as pH, temperature, and the addition of seed crystals, scale-causing ions in the water, such as calcium ions, magnesium ions, and sulfate ions, are induced to form tiny solid crystal particles and separate from the water, thereby producing a primary water with a significantly reduced ion concentration. Subsequently, this primary water is sent to the direct filtration system 32. The direct filtration system 32 is typically an MDF direct filtration system 32, which further removes trace amounts of crystal particles or other suspended solids that may be carried in the primary water through physical filtration, ultimately producing clear reprocessed water. This reprocessed water is then sent back to the reverse osmosis system 1 for reuse, mixing with the concentrate in one of the reverse osmosis components and then being transported downstream of that component. This ultimately reduces the feed water concentration and scale-causing ion concentration of the reverse osmosis component downstream of that component.
[0024] The beneficial effects of this embodiment are that, through the combined process of crystallization and precision filtration, scale-causing ions and particulate matter that easily lead to membrane fouling and clogging are specifically removed. This greatly protects the reverse osmosis membrane elements, reduces the pressure they are subjected to, alleviates scaling in downstream reverse osmosis components, extends their cleaning cycle and service life, and improves the water purification rate. It also reduces the amount of water required for evaporation and crystallization, ensuring the long-term stable operation of the entire system.
[0025] In some embodiments, the crystallizer 31 includes at least one of a fluidized bed granulation crystallizer 31, an Oslo crystallizer 31, or a DTB crystallizer 31, which can form scale-causing ions in the concentrated water within it into solid particles and separate them. The direct filtration system 32 includes a filter membrane column 321 with a filtration accuracy of 0.1-10 μm, which is used to filter primary water and retain residual solid particles in the primary water.
[0026] The crystallizer 31 of the high-salt concentrate filtration system in this embodiment of the invention can be selected from one of a fluidized bed granulation crystallizer, an Oslo crystallizer, or a DTB crystallizer (drip tube baffle crystallizer). These crystallizers 31 can efficiently achieve crystal growth and solution separation. For example, a fluidized bed granulation crystallizer can form scale-causing ions in the flowing medium into larger, easily separable crystal particles. The core of the direct filtration system 32 is the filter membrane column 321, whose filtration accuracy is controlled between 0.1 micrometers and 10 micrometers. This accuracy range is sufficient to effectively trap fine crystal particles carried out from the crystallizer 31, preventing them from entering the subsequent reverse osmosis membrane and causing scratches or blockages.
[0027] The beneficial effects of the high-salt concentrate filtration system of this invention are that the crystallizer 31 can generate high-purity, easily processed crystal products for sale and other revenue-generating purposes. The main purpose is to remove scale-causing ions and further filter the concentrate. Meanwhile, the high-precision filter membrane column 321 ensures the quality of the retreated water, meeting the water quality requirements for return to the precision reverse osmosis membrane system. This, combined with the improved equipment, enhances the reliability and efficiency of the retreatment process.
[0028] In some embodiments, the plurality of reverse osmosis components include a first reverse osmosis component 111 and a second reverse osmosis component 112, wherein the concentrate produced by the second reverse osmosis component 112 can be diverted to the crystallizer 31 and the evaporation crystallization system 2, and the treated water is mixed with the concentrate produced by the first reverse osmosis component 111 and then sent to the second reverse osmosis component 112 for filtration.
[0029] As attached Figure 1As shown, this embodiment has two reverse osmosis components. The concentrate produced by the second reverse osmosis component 112 is divided into two paths: one path enters the crystallizer 31 for softening treatment, and the other path is directly sent to the evaporation crystallization system 2. The retreated water produced from the direct filtration system 32 is mixed with the concentrate produced by the first reverse osmosis component 111, diluting the concentrate produced by the first reverse osmosis component 111. The mixed water then enters the second reverse osmosis component 112 as feed water for treatment.
[0030] The high-salt concentrate filtration system of this invention optimizes material balance through this specific diversion and recirculation design. It controls the amount of water entering the high-energy-consuming evaporation and crystallization system 2, while using high-quality retreated water to improve the feed water quality of the second-stage reverse osmosis. This not only alleviates the risk of scaling but also increases the water production rate of the second-stage reverse osmosis, thereby improving the overall system treatment efficiency and economy.
[0031] In some embodiments, the reverse osmosis assembly includes a plurality of reverse osmosis membrane modules 110 arranged in parallel. Each reverse osmosis module contains a plurality of reverse osmosis membrane units, wherein the number of reverse osmosis membrane units in the first reverse osmosis assembly 111 is C, and the number of reverse osmosis membrane units in the second reverse osmosis assembly 112 is D, with the ratio of C to D ranging from 2:1 to 1:1. The reverse osmosis membrane elements in the reverse osmosis membrane module 110 are ultra-high pressure reverse osmosis membrane elements with a maximum operating pressure of not less than 1500 psi, and preferably have wide flow channels and hydrophilic antifouling properties.
[0032] In the high-salt concentrate filtration system of this invention, the reverse osmosis module has an inlet, a first outlet, and a second outlet. The first outlet produces concentrate, and the second outlet produces desalinated water. The ratio of concentrate to desalinated water is adjustable. Each reverse osmosis unit, whether the first or the second, can be composed of multiple reverse osmosis membrane modules 110 connected in parallel. This means that the feed water entering the reverse osmosis unit is evenly distributed to each of the parallel reverse osmosis membrane modules for simultaneous treatment. Each reverse osmosis membrane module 110 can produce concentrate and desalinated water respectively. The concentrate produced by each reverse osmosis membrane module 110 is collected, and the desalinated water is collected. Alternatively, the number and position of the reverse osmosis modules in the first reverse osmosis unit 111 and the second reverse osmosis unit 112 are one-to-one. In this case, the concentrate produced by a single reverse osmosis module in the first reverse osmosis unit 111 is delivered to the inlet of a single reverse osmosis module in the second reverse osmosis unit 112. The purified water and concentrate produced by multiple reverse osmosis modules in the second reverse osmosis unit 112 are collected, and the collected concentrate can be diverted to the crystallizer 31 or the evaporation crystallization system 2. The total number of reverse osmosis membrane units in the first reverse osmosis unit 111 is C, and the total number of reverse osmosis membrane units in the second reverse osmosis unit 112 is D, with the ratio of C to D ranging from 2:1 to 1:1. This ensures that the first reverse osmosis unit can filter raw water to the maximum extent and reduces the pressure on the second reverse osmosis unit 112.
[0033] In some embodiments, multiple reverse osmosis membrane elements in a single reverse osmosis module are arranged in series, with reverse osmosis membrane elements having relatively high flux characteristics positioned near the feed water side and reverse osmosis membrane elements having high desalination rates or wider flow channels positioned near the concentrate side. This improves the filtration efficiency and filtration effect of the entire reverse osmosis module.
[0034] The high-salt concentrate filtration system of this invention employs parallel reverse osmosis modules, which greatly increases the processing capacity of a single reverse osmosis unit and provides operational flexibility. When maintenance, cleaning, or replacement is required, one or more reverse osmosis membrane modules 110 can be isolated without stopping the entire system, enhancing system maintainability and reducing the risk of a single point of failure causing a complete system shutdown.
[0035] In some embodiments, the high-salt concentrate filtration system further includes an energy recovery system 4, which is connected to the reverse osmosis system 1 and the reprocessing system 3. The energy recovery system 4 can use the concentrate produced by the reverse osmosis system 1 to drive the flow of reprocessed water.
[0036] The high-salt concentrate filtration system of this invention incorporates an energy recovery system 4. This system is connected to the reverse osmosis system 1 and the reprocessing system 3. Its principle is to utilize the residual pressure energy carried by the high-pressure concentrate discharged from the reverse osmosis membrane module 110 to drive or assist in driving the reprocessed water transport process. By recovering the pressure energy of the high-pressure concentrate, the energy consumption of the water pump 5 required for transporting the reprocessed water is significantly reduced, thereby reducing the total power consumption of the system and lowering operating costs.
[0037] In some embodiments, the energy recovery system 4 includes a first flow channel, a second flow channel, and a mechanical drive component. The concentrate produced by the second reverse osmosis component 112 flows into the first flow channel and is diverted through the first flow channel to the crystallizer 31 and the evaporation crystallization system 2. The reprocessed water is transported through the second flow channel to the reverse osmosis system 1 and mixed with the concentrate produced by the first reverse osmosis component 111. The mechanical drive component is connected to the first flow channel and the second flow channel. The fluid in the first flow channel can drive the mechanical drive component to operate, and the mechanical drive component can drive the fluid flow in the second flow channel.
[0038] The high-salt concentrate filtration system of this invention describes the specific structure of the energy recovery system 4. The system includes a first flow channel, a second flow channel, and a mechanical drive assembly. The first flow channel is used to transport the high-pressure concentrate produced from the second reverse osmosis unit 112 and divert it to the crystallizer 31 and the evaporation crystallization system 2. The second flow channel is used to transport the retreated water from the direct filtration system 32 back to the reverse osmosis system 1. The mechanical drive assembly, essentially an energy transfer device, such as a worm gear-pump 5 assembly, utilizes the fluid energy of the high-pressure concentrate in the first flow channel within the worm gear to simultaneously operate the worm gear and the pump 5. The pump 5 then applies pressure to the retreated water in the second flow channel, propelling its flow.
[0039] The beneficial effects of the high-salt concentrated water filtration system of this invention are that it realizes the direct and mechanical transfer of energy from high-pressure concentrated water to low-pressure reprocessed water, with high energy recovery efficiency, fast system response, and no involvement of fluid mixing, ensuring that the water quality is not cross-contaminated and that the operation is stable and reliable.
[0040] In some embodiments, the flow rate of concentrated water diverted to the crystallizer 31 is A, and the flow rate of concentrated water diverted to the evaporation crystallization system 2 is B, where A / B = 0.25-1.
[0041] This embodiment of the high-salt concentrate filtration system focuses on controlling the ratio of water flow to crystallizer 31 and evaporative crystallization system 2. The ratio of concentrate flow rate entering crystallizer 31 to concentrate flow rate entering evaporative crystallization system 2 is controlled within the range of 0.25 to 1 by adjusting valve 6. For example, if the flow rate entering evaporative crystallization system 2 is four parts, the flow rate entering crystallizer 31 can be controlled between one and four parts. This ensures that the hardness of the mixed water entering the second reverse osmosis component 112 is below a safe threshold, which is theoretically based on the Steve Davis saturation index.
[0042] The beneficial effect of the high-salt concentrated water filtration system in this embodiment of the invention lies in the fact that precise control of the split ratio is key to achieving optimal system operation. It ensures sufficient water enters the crystallizer 31 for softening and recovery, while simultaneously preventing the evaporation crystallization system 2 from processing too much or too little water. This ratio range is a practically proven balance point that achieves the best balance between energy consumption and resource recovery while ensuring treatment effectiveness.
[0043] In some embodiments, the purity of the solid particulate matter is not less than 95%.
[0044] This embodiment optimizes the operating conditions of the crystallizer 31, such as supersaturation control, residence time, and stirring intensity, so that the purity of the main salts in the solid particles separated by the crystallizer 31 is not less than 95%. High-purity crystallized products, such as calcium carbonate, have higher commercial value and resource utilization potential, and can be sold as products, thus turning waste into treasure and improving efficiency.
[0045] In some embodiments, the high-salt concentrate filtration system further includes at least one of a water pump 5, a valve 6, a pressure gauge 7, a flow meter 8, and a hardness meter 9, wherein at least one of the water pump 5, the valve 6, the pressure gauge 7, the flow meter 8, and the hardness meter 9 is located upstream of the reverse osmosis system 1 or between any two of the reverse osmosis system 1, the evaporation crystallization system 2, the reprocessing system 3, and the energy recovery system 4.
[0046] In the high-salt concentrate filtration system of this invention, pumps 5, valves 6, pressure gauges 7, flow meters 8, and hardness testers 9 can be installed at any location requiring detection or control. For example, a hardness tester 9 is installed at the inlet of the reverse osmosis system 1 to monitor scaling tendency, and pressure gauges 7 and flow meters 8 are installed on the inlet and outlet pipes of each reverse osmosis membrane module 110 to monitor operating status; in particular, a hardness tester 9 is installed at the inlet of the second branch osmosis module to ensure that the hardness of the inlet water is below the safe threshold; and regulating hardness testers 9 and valves 6 are installed on the branch pipes leading to the crystallizer 31 and the evaporation crystallization system 2 to control the flow rate.
[0047] The high-salt concentrate filtration system of this invention directly reduces the amount of water entering the evaporation and crystallization system 2 by improving the recovery rate of the reverse osmosis system 1. Evaporation and crystallization is the most energy-intensive unit in the entire system, thus resulting in the most significant operating cost savings. The energy recovery system 4 directly uses the residual pressure energy of the high-pressure concentrate produced by the reverse osmosis components to drive the delivery of reprocessed water, effectively reducing the system's pumping energy consumption. The system, through the reprocessing system 3 (crystallizer 31 + direct filter system 32), specifically removes scale-causing ions such as calcium, magnesium, and sulfate from the concentrate, which are most prone to membrane fouling and scaling, and converts them into solid particles for separation, thus mitigating scaling in the second-stage reverse osmosis components.
[0048] The overall operation process of the high-salt concentrated water filtration system according to an embodiment of the present invention is described below: S1. After pretreatment, the raw water is sent to the reverse osmosis system 1 and filtered sequentially by multiple reverse osmosis components. The fresh water produced by each reverse osmosis component is sent to the fresh water tank. S2. The concentrated water produced by the second reverse osmosis component 112 is depressurized through the first flow channel and then diverted to the evaporation crystallization system 2 and the crystallizer 31; S3. The concentrated water diverted to evaporation crystallization system 2 is evaporated and crystallized in evaporation crystallization system 2 to obtain solid salt and water vapor; S4. The concentrated water diverted to the crystallizer 31 can be treated by the crystallizer 31 to form primary water, in which scale-causing ions are crystallized by the crystallizer 31 to form solid particles and are separated out. S5. Primary water is transported to the direct filtration system 32, which can intercept residual solid particles in the primary water and produce retreated water; S6. The retreated water can be pressurized after passing through the second flow channel and can be mixed with the concentrated water produced by the first reverse osmosis component 111, and then filtered by the second reverse osmosis component 112.
[0049] It should be noted that the above descriptions are not in any particular order. The entire system is actually a loop system, and the segmented description above is intended to facilitate the description of the operation of the entire system.
[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 invention and simplifying the description, and are not intended to 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 invention.
[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0054] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0055] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.
Claims
1. A high-salinity concentrated water filtration system, characterized in that, include: A reverse osmosis system (1) includes multiple reverse osmosis components, which are connected in series. The downstream reverse osmosis component in two adjacent reverse osmosis components is used to filter the concentrate produced by the upstream reverse osmosis component. A reprocessing system (3) is connected to the reverse osmosis system (1) for filtering the concentrate produced by any of the reverse osmosis components and producing reprocessed water. The reprocessed water can be transported to the reverse osmosis system (1) and mixed with the concentrate produced by any of the reverse osmosis components. An evaporation crystallization system (2) is connected to the reverse osmosis system (1) and is used to evaporate and crystallize the concentrate produced by any of the reverse osmosis components.
2. The high-salinity concentrated water filtration system according to claim 1, characterized in that, The reprocessing system (3) includes: Crystallizer (31), which is connected to the reverse osmosis system (1), is used to separate scale-causing ions from the concentrate produced by at least one of the reverse osmosis components and produce primary water; A direct filtration system (32) is connected to the crystallizer (31) and the reverse osmosis system (1) for filtering the primary water and producing the retreated water.
3. The high-salinity concentrated water filtration system according to claim 2, characterized in that, The crystallizer (31) includes at least one of a fluidized bed granulation crystallizer, an Oslo crystallizer, or a DTB crystallizer, and the crystallizer (31) can form the scale-causing ions in the concentrate within it into solid particles and separate them. And / or, the direct filtration system (32) includes a filter membrane column (321) with a filtration accuracy of 0.1-10 μm, the filter membrane column (321) being used to filter the primary water and trap the solid particles remaining in the primary water.
4. The high-salinity concentrated water filtration system according to claim 3, characterized in that, The purity of the solid particulate matter is ≥95%.
5. The high-salinity concentrated water filtration system according to claim 1, characterized in that, The plurality of reverse osmosis components include a first reverse osmosis component (111) and a second reverse osmosis component (112), wherein the concentrate produced by the second reverse osmosis component (112) can be diverted to the crystallizer (31) and the evaporation crystallization system (2), and the reprocessed water is mixed with the concentrate produced by the first reverse osmosis component (111) and then transported to the second reverse osmosis component (112) for filtration.
6. The high-salinity concentrated water filtration system according to claim 5, characterized in that, The reverse osmosis assembly includes multiple reverse osmosis membrane groups (110) arranged in parallel. Each reverse osmosis module contains multiple reverse osmosis membrane units. The number of reverse osmosis membrane units in the first reverse osmosis assembly (111) is C, and the number of reverse osmosis membrane units in the second reverse osmosis assembly (112) is D. The range of C:D is between 2:1 and 1:
1.
7. The high-salinity concentrated water filtration system according to claim 1, characterized in that, It also includes an energy recovery system (4), which is connected to the reverse osmosis system (1) and the reprocessing system (3). The energy recovery system (4) can use the concentrated water produced by the reverse osmosis system (1) to drive the flow of the reprocessed water.
8. The high-salt concentrated water filtration system according to claim 7, characterized in that, The energy recovery system (4) includes: The concentrated water produced by the second reverse osmosis component (112) flows into the first flow channel and is then diverted through the first flow channel to the crystallizer (31) and the evaporation crystallization system (2). The second channel through which the retreated water is transported to the reverse osmosis system (1) and mixed with the concentrate produced by the first reverse osmosis component (111); A mechanical drive assembly is connected to the first flow channel and the second flow channel. Fluid in the first flow channel can drive the mechanical drive assembly to move, and the mechanical drive assembly can drive the fluid in the second flow channel to flow.
9. The high-salinity concentrated water filtration system according to claim 8, characterized in that, The flow rate of concentrated water diverted to the crystallizer (31) is A, and the flow rate of concentrated water diverted to the evaporation crystallization system (2) is B, where A / B = 0.25-1.
10. The high-salinity concentrated water filtration system according to any one of claims 1-9, characterized in that, It also includes at least one of a water pump (5), a valve (6), a pressure gauge (7), a flow meter (8), and a hardness tester (9), wherein at least one of the water pump (5), the valve (6), the pressure gauge (7), the flow meter (8), and the hardness tester (9) is located upstream of the reverse osmosis system (1) or between any two of the reverse osmosis system (1), the evaporation crystallization system (2), the reprocessing system (3), and the energy recovery system (4).