Injection water preparation system based on multistage membrane filtration

Abstract

The invention belongs to the technical field of pharmaceutical water preparation, and particularly relates to an injection water preparation system based on multistage membrane filtration, the injection water preparation system comprises a raw water tank and a mounting rack, the raw water tank is fixedly mounted at the left end of the mounting rack, a pretreatment ultrafiltration assembly is arranged at the left end of the mounting rack, and the raw water tank is connected with the pretreatment ultrafiltration assembly; a duplex softener is fixedly mounted at the part, close to the left side of the pretreatment ultrafiltration assembly, of the left end of the mounting frame, the duplex softener is connected with the pretreatment ultrafiltration assembly, and a first medium-pressure ultraviolet assembly is fixedly mounted in the middle of the mounting frame; raw water passes through the pretreatment ultrafiltration assembly to remove suspended matters and organic matters, then the water enters the duplex softener to remove hardness ions and prevent scaling, then the water passes through the first medium-pressure ultraviolet assembly to kill microorganisms and the security filter to further remove particles, and then the reverse osmosis assembly utilizes a high-pressure pump and a membrane separation technology to remove dissolved salts and bacteria. The high-purity water is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of pharmaceutical water preparation, in particular to an injection water preparation system based on multi-stage membrane filtration. Background Art

[0002] Water for injection refers to water that meets the requirements of the Chinese Pharmacopoeia under the item of Water for Injection. Water for injection is distilled water or deionized water obtained by distillation, so it is also called heavy distilled water. In order to effectively control microbial contamination and at the same time control the level of bacterial endotoxins, water for injection (WFI), as a key raw material in the pharmaceutical industry, must meet strict standards such as sterility, pyrogen-free, and low TOC (total organic carbon).

[0003] In traditional water treatment processes, such as the "ion exchange + distillation" method, there are some significant problems. First, pollution will be generated during the resin regeneration process, which is not only harmful to the environment, but also increases treatment costs. Secondly, the energy consumption of this method is relatively high, which is not in line with the current trend of energy conservation and emission reduction. In addition, the control of total organic carbon (TOC) is not stable enough, making it difficult to ensure the quality of the effluent. On the other hand, although the single membrane process has performed well in some aspects, it also faces some challenges. For example, the membrane fouling problem is serious, which will reduce the service life and treatment efficiency of the membrane. Insufficient desalination rate is also a problem, especially when treating high-salinity water sources. It is difficult to achieve the ideal desalination effect, and the removal of endotoxins is not thorough enough, which may pose a hidden danger to the subsequent water safety.

[0004] Although multi-stage membrane filtration systems have been applied in the existing technology, there are still some shortcomings. First, the water production rate is relatively low, which means that more raw water needs to be processed to obtain the same amount of water production, thereby increasing operating costs. Second, the degree of automation is insufficient, which not only increases the complexity and labor intensity of manual operation, but may also lead to operational errors and affect the water quality. Poor long-term operating stability is also a problem that cannot be ignored. This will lead to frequent maintenance and shutdown of the system, affecting production efficiency and economic benefits.

[0005] To this end, the present invention provides a system for preparing water for injection based on multi-stage membrane filtration. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the injection water preparation system based on multi-stage membrane filtration of the present invention includes a raw water tank and a mounting frame, the raw water tank is fixedly installed on the left end of the mounting frame, the left end of the mounting frame is provided with a pretreatment ultrafiltration component, the raw water tank is connected to the pretreatment ultrafiltration component, the left end of the mounting frame is fixedly installed with a double softener near the left side of the pretreatment ultrafiltration component, the double softener is connected to the pretreatment ultrafiltration component, the middle part of the mounting frame is fixedly installed with a first medium-pressure ultraviolet component, the first medium-pressure ultraviolet component is connected to the double The mounting frame is connected to the softener, a security filter is provided on the front side of the first medium-pressure ultraviolet component installed on the mounting frame, the security filter is connected to the first medium-pressure ultraviolet component, the mounting frame is installed on the right side of the security filter and fixedly installed with a reverse osmosis component, a second medium-pressure ultraviolet component is fixedly installed on the mounting frame on the right side of the reverse osmosis component, the second medium-pressure ultraviolet component is connected to the reverse osmosis component, an electrodeionization component is provided at the right end of the mounting frame, a terminal ultrafiltration component is provided at the right end of the mounting frame, the electrodeionization component and the terminal ultrafiltration component are connected to the second medium-pressure ultraviolet component.

[0008] As a preferred technical solution of the present application, the pretreatment ultrafiltration component and the terminal ultrafiltration component both include raw water pumps, two groups of the raw water pumps are fixedly installed on the mounting frame, two groups of first pipe networks are fixedly installed on both ends of the left and right ends of the mounting frame, the two groups of the first pipe networks are respectively connected to the two groups of raw water pumps, the two groups of the first pipe networks are installed with pressure gauges, the two groups of the first pipe networks are provided with multiple groups of solenoid valves, the front side pipe openings of the two groups of the first pipe networks are both installed with first ultrafiltration tanks through flanges, the front side pipe openings of the two groups of the first pipe networks are both installed with second ultrafiltration tanks through flanges, the two groups of the first ultrafiltration tanks and the two groups of the second ultrafiltration tanks are arranged in parallel, and the right end of the mounting frame is installed on the raw water pump with a third water pipe.

[0009] As a preferred technical solution of the present application, two sets of flange interfaces are provided on the rear side of the duplex softener, and the two sets of flange interfaces are respectively connected to the duplex softener and the left end of the first medium-pressure ultraviolet component. A first water pipe is installed on the front side of the right end of the first medium-pressure ultraviolet component through a flange, and the front end of the first water pipe is connected to the lower end of the security filter through a flange. A second water pipe is provided at the upper end of the security filter, and the second water pipe is connected to the reverse osmosis component through a nut.

[0010] As a preferred technical solution of the present application, the reverse osmosis component includes a positioning frame, which is fixedly mounted on a mounting frame, a water tank is fixedly mounted on the positioning frame, a high-pressure pump is fixedly mounted on the upper side of the positioning frame, the high-pressure pump is located on the upper side of the water tank, the right ends of the water tank and the high-pressure pump are installed with a first connecting pipe through a nut, the left end of the water tank is installed with a second connecting pipe through a nut, the first reverse osmosis tank is fixedly mounted on the lower side of the left end of the positioning frame, the second reverse osmosis tank is fixedly mounted on the lower side of the right end of the positioning frame, the upper ends of the first reverse osmosis tank and the second reverse osmosis tank are installed with a third connecting pipe through a nut, the opening of the upper right end of the third connecting pipe is installed with a fourth connecting pipe through a nut, and the fourth connecting pipe is connected to the left end opening of the second medium-pressure ultraviolet component through a flange.

[0011] As a preferred technical solution of the present application, the electrodeionization component includes a first pressure tank, which is fixedly mounted on a mounting frame, a second pressure tank is fixedly mounted on the right end of the mounting frame, a second pipe network is mounted on the rear ends of the first pressure tank and the second pressure tank through nuts, a fifth connecting pipe is provided at the left end of the second pipe network, the fifth connecting pipe is connected to the right end of the second medium-pressure ultraviolet component through a flange, and the right end of the second pipe network is connected to the third water pipe through a flange.

[0012] As a preferred technical solution of the present application, a return pipe is fixedly installed at the rear end of the security filter through a flange, and the left end of the return pipe is fixedly connected to the lower end of the raw water tank through a flange.

[0013] As a preferred technical solution of the present application, the ultrafiltration membranes in the first ultrafiltration tank and the second ultrafiltration tank included in the pretreatment ultrafiltration component are both polyethersulfone hollow fiber membranes, and the ultrafiltration membranes in the first ultrafiltration tank and the second ultrafiltration tank included in the pretreatment ultrafiltration component have a molecular weight cutoff of 100kDa and a filtration accuracy of 0.01μm.

[0014] As a preferred technical solution of the present application, the ultrafiltration membranes in the first ultrafiltration tank and the second ultrafiltration tank included in the terminal ultrafiltration component are hydrophilic PVDF, the ultrafiltration membranes in the first ultrafiltration tank and the second ultrafiltration tank included in the terminal ultrafiltration component have a molecular weight cutoff of 5kDa, and the filtration accuracy is 0.005μm.

[0015] As a preferred technical solution of the present application, the electrodeionization component is composed of a continuous electric regeneration mixed bed, and the first pressure tank and the second pressure tank are both filled with anion and cation exchange resins and ion exchange membranes.

[0016] As a preferred technical solution of the present application, the reverse osmosis membrane in the first reverse osmosis tank is a brackish water membrane, and the reverse osmosis membrane in the second reverse osmosis tank is an ultra-low pressure high desalination membrane.

[0017] The beneficial effects of the present invention are as follows:

[0018] In the injection water preparation system based on multi-stage membrane filtration described in the present invention, raw water passes through a pretreatment ultrafiltration component to remove suspended matter and organic matter. Subsequently, the water enters a duplex softener to remove hardness ions and prevent scaling. Next, the water passes through a first medium-pressure ultraviolet component to kill microorganisms, and a security filter further removes particles. Thereafter, a reverse osmosis component uses a high-pressure pump and membrane separation technology to remove dissolved salts and bacteria to obtain high-purity water. The water passes through the ultraviolet component again to ensure biological safety, and then enters the electrodeionization component, which uses electrodeionization component technology to remove ionic impurities and improve purity. Finally, the water passes through a terminal ultrafiltration component, using a PVDF membrane to ensure that it meets the injection water standard, and the rear end of the security filter is connected to the raw water tank to realize the recycling and treatment of concentrated water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a front view structural schematic diagram of the present invention;

[0021] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0022] Figure 3 This is a front view structural diagram of the terminal ultrafiltration component of the present invention;

[0023] Figure 4 1 is a schematic diagram of the rear view structure of the reverse osmosis component of the present invention;

[0024] Figure 5 1 is a front view structural diagram of the reverse osmosis component of the present invention;

[0025] Figure 6 1 is a schematic diagram of the front view of the electrodeionization component of the present invention;

[0026] Figure 7 The present invention provides a system block diagram of a water for injection preparation system based on multi-stage membrane filtration.

[0027] Figure: 1, raw water tank; 2, pre-treatment ultrafiltration component; 3, duplex softener; 4, first medium-pressure ultraviolet component; 5, safety filter; 6, reverse osmosis component; 7, second medium-pressure ultraviolet component; 8, electrodeionization component; 9, terminal ultrafiltration component; 10, mounting frame; 11, raw water pump; 12, first pipe network; 13, pressure gauge; 14, solenoid valve; 15, first ultrafiltration tank; 16, second ultrafiltration tank; 17, flange interface; 18, first output Water pipe; 19, second water pipe; 20, third water pipe; 21, return pipe; 601, positioning frame; 602, water storage tank; 603, high-pressure pump; 604, first connecting pipe; 605, second connecting pipe; 606, first reverse osmosis tank; 607, second reverse osmosis tank; 608, third connecting pipe; 609, fourth connecting pipe; 801, first pressure tank; 802, second pressure tank; 803, second pipe network; 804, fifth connecting pipe. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0029] like Figures 1 to 7 As shown, the injection water preparation system based on multi-stage membrane filtration according to the embodiment of the present invention includes a raw water tank 1 and a mounting frame 10. The raw water tank 1 is fixedly mounted on the left end of the mounting frame 10. The left end of the mounting frame 10 is provided with a pretreatment ultrafiltration component 2. The raw water tank 1 is connected to the pretreatment ultrafiltration component 2. A duplex softener 3 is fixedly mounted on the left end of the mounting frame 10 near the left side of the pretreatment ultrafiltration component 2. The duplex softener 3 is connected to the pretreatment ultrafiltration component 2. A first medium-pressure ultraviolet component 4 is fixedly mounted on the middle part of the mounting frame 10. The first medium-pressure ultraviolet component 4 is connected to the duplex softener 3. A security filter 5 is provided on the front side of the first medium-pressure ultraviolet component 4 installed on the mounting rack 10, and the security filter 5 is connected to the first medium-pressure ultraviolet component 4. The mounting rack 10 is installed on the right side of the security filter 5 and a reverse osmosis component 6 is fixedly installed. A second medium-pressure ultraviolet component 7 is fixedly installed on the mounting rack 10 on the right side of the reverse osmosis component 6, and the second medium-pressure ultraviolet component 7 is connected to the reverse osmosis component 6. An electrodeionization component 8 is provided at the right end of the mounting rack 10, and a terminal ultrafiltration component 9 is provided at the right end of the mounting rack 10. The electrodeionization component 8 and the terminal ultrafiltration component 9 are connected to the second medium-pressure ultraviolet component 7.

[0030] The pre-treatment ultrafiltration component 2 effectively removes suspended solids and organic matter in the raw water, laying the foundation for subsequent treatment. The dual softener 3 further removes hardness ions in the water, prevents equipment scaling, and extends the service life of the system. The introduction of the first medium-pressure ultraviolet component 4 successfully kills microorganisms in the water and ensures the biological safety of the water. By utilizing the ultraviolet light emitted by the first medium-pressure ultraviolet component 4, the free chlorine and combined chlorine compounds in the water undergo photochemical reactions and dissociate, thereby effectively reducing the chlorine content in the water. Ammonia and ammonium ions in the water may undergo a series of photochemical reactions under the action of medium-pressure ultraviolet light. On the one hand, ultraviolet light directly acts on ammonia or ammonium ions, breaking their chemical bonds and producing harmless substances such as nitrogen. On the other hand, strong oxidizing substances such as hydroxyl radicals generated by ultraviolet light may also undergo oxidation reactions with ammonia or ammonium ions, converting them into other forms that are easy to remove, thereby achieving the effect of deamination. It can effectively reduce the chlorine content in the water. The security filter 5 serves as the last line of defense for particle removal, ensuring the purity of the water entering the reverse osmosis component 6. The reverse osmosis component 6, as the core part of the system, allows water molecules to pass through the reverse osmosis membrane, while impurities such as dissolved salts and bacteria are effectively intercepted, thereby achieving the preparation of high-purity water. The second medium-pressure ultraviolet component 7 performs biosafety treatment on the water quality again to ensure the sterility of the water. The ultraviolet rays emitted by the second medium-pressure ultraviolet component 7 can directly photolyze organic matter in the water and decompose it into carbon dioxide and water. On the other hand, it can photolyze water molecules to produce charged hydroxyl groups. Hydroxyl groups have strong oxidizing properties and can oxidize and decompose organic matter, thereby reducing the TOC content in water for injection. The electrodeionization component 8 uses electrical regeneration technology to continuously remove ionic impurities in the water, further improving the purity of the water. Finally, the terminal ultrafiltration component 9 finely filters the water quality to ensure that the output water meets the standards for water for injection.

[0031] like Figures 1 to 3 As shown, the pretreatment ultrafiltration component 2 and the terminal ultrafiltration component 9 both include a raw water pump 11, and two groups of raw water pumps 11 are fixedly installed on the mounting frame 10. Two groups of first pipe networks 12 are fixedly installed on the left and right ends of the mounting frame 10. The two groups of first pipe networks 12 are respectively connected to the two groups of raw water pumps 11. Pressure gauges 13 are installed on the two groups of first pipe networks 12. Multiple groups of solenoid valves 14 are provided on the two groups of first pipe networks 12. The front pipe openings of the two groups of first pipe networks 12 are both equipped with first ultrafiltration tanks 15 through flanges. The front pipe openings of the two groups of first pipe networks 12 are both equipped with second ultrafiltration tanks 16 through flanges. The two groups of first ultrafiltration tanks 15 and the two groups of second ultrafiltration tanks 16 are arranged in parallel, and the right end of the mounting frame 10 is equipped with a third water pipe 20 installed on the raw water pump 11.

[0032] The design of the pretreatment ultrafiltration component 2 and the terminal ultrafiltration component 9 fully considers the efficiency and stability of water treatment. The raw water pump 11 provides stable power to send the raw water through the first pipe network 12 into the first ultrafiltration tank 15 and the second ultrafiltration tank 16 for filtration. The setting of the solenoid valve 14 realizes the precise control of the water flow and ensures the smooth progress of the filtration process. The ultrafiltration membranes in the first ultrafiltration tank 15 and the second ultrafiltration tank 16 use advanced materials and technologies, which can effectively remove suspended matter, organic matter and other impurities in the water, while retaining minerals and trace elements that are beneficial to the human body.

[0033] like Figures 1 to 4 As shown, two sets of flange interfaces 17 are provided on the rear side of the duplex softener 3, and the two sets of flange interfaces 17 are respectively connected to the duplex softener 3 and the left end of the first medium-pressure ultraviolet component 4. A first water pipe 18 is installed on the front side of the right end of the first medium-pressure ultraviolet component 4 through a flange. The front end of the first water pipe 18 is connected to the lower end of the security filter 5 through a flange. The upper end of the security filter 5 is provided with a second water pipe 19, and the second water pipe 19 is connected to the reverse osmosis component 6 through a nut.

[0034] The connection design between the dual softener 3 and the first medium-pressure ultraviolet component 4 not only ensures continuous water treatment, but also realizes a stable connection between the devices through the flange interface 17, thereby improving the overall stability of the system. The setting of the first water pipe 18 and the second water pipe 19 realizes the smooth transmission of water flow, avoiding water pollution or pressure loss caused by improper pipe connection. The security filter 5 is a key component connecting the first medium-pressure ultraviolet component 4 and the reverse osmosis component 6. Its unique structural design effectively prevents particles from entering the reverse osmosis component 6, thereby protecting the reverse osmosis membrane and extending the service life of the reverse osmosis component 6.

[0035] like Figures 1 to 5 As shown, the reverse osmosis component 6 includes a positioning frame 601, which is fixedly mounted on the mounting frame 10. A water tank 602 is fixedly mounted on the positioning frame 601. A high-pressure pump 603 is fixedly mounted on the upper side of the positioning frame 601. The high-pressure pump 603 is located on the upper side of the water tank 602. The right ends of the water tank 602 and the high-pressure pump 603 are mounted with a first connecting pipe 604 through a nut, and the left end of the water tank 602 is mounted with a second connecting pipe 605 through a nut. A first reverse osmosis tank 606 is fixedly mounted on the lower side of the left end of the positioning frame 601, and a second reverse osmosis tank 607 is fixedly mounted on the lower side of the right end of the positioning frame 601. A third connecting pipe 608 is mounted on the upper ends of the first reverse osmosis tank 606 and the second reverse osmosis tank 607 through a nut. A fourth connecting pipe 609 is mounted on the opening of the upper right end of the third connecting pipe 608 through a nut. The fourth connecting pipe 609 is connected to the left end opening of the second medium-pressure ultraviolet component 7 through a flange.

[0036] By making full use of the pressure generated by the high-pressure pump 603, the water flowing into the water storage tank 602 is transported into the reverse osmosis membrane in the first reverse osmosis tank 606 and the second reverse osmosis tank 607, thereby achieving effective retention of impurities such as dissolved salts and bacteria. The arrangement of the first connecting pipe 604, the second connecting pipe 605 and the third connecting pipe 608 ensures the smooth transmission of water between the high-pressure pump 603, the water storage tank 602, the first reverse osmosis tank 606 and the second reverse osmosis tank 607, and also facilitates the maintenance and replacement of the equipment. The connection design of the fourth connecting pipe 609 realizes the smooth discharge of water after reverse osmosis treatment, which provides convenience for subsequent processing. In addition, the parallel arrangement of the first reverse osmosis tank 606 and the second reverse osmosis tank 607 not only improves the processing capacity of the system, but also makes the connection between equipment more compact, reduces the footprint, and reduces the overall cost of the system.

[0037] like Figures 1 to 6 As shown, the electrodeionization component 8 includes a first pressure tank 801, which is fixedly mounted on the mounting frame 10. A second pressure tank 802 is fixedly mounted on the right end of the mounting frame 10. The rear ends of the first pressure tank 801 and the second pressure tank 802 are installed with a second pipe network 803 through nuts. A fifth connecting pipe 804 is provided at the left end of the second pipe network 803. The fifth connecting pipe 804 is connected to the right end of the second medium-pressure ultraviolet component 7 through a flange, and the right end of the second pipe network 803 is connected to the third water pipe 20 through a flange.

[0038] Through electrical regeneration technology, ionic impurities in water are continuously removed, further improving the purity of water. The second pipe network 803 serves as a bridge connecting the first pressure tank 801, the second pressure tank 802 and subsequent processing equipment, ensuring the continuity and stability of the water flow. The setting of the fifth connecting pipe 804 enables the water after reverse osmosis treatment to be smoothly introduced into the electrodeionization component 8, fully considering the ion removal efficiency and the stability of the equipment, and providing a strong guarantee for the preparation of high-quality water for injection.

[0039] like Figures 1 to 2 As shown, a return pipe 21 is fixedly installed at the rear end of the safety filter 5 through a flange, and the left end of the return pipe 21 is fixedly connected to the lower end of the raw water tank 1 through a flange.

[0040] The concentrated water treated by the security filter 5 can flow back to the raw water tank 1 through the return pipe 21 under certain conditions, realizing the circulation filtration of the concentrated water and improving the water resource utilization efficiency of the system. At the same time, this return design also provides the possibility for flexible operation of the system. For example, during the system startup phase or when the water quality fluctuates, the flow of the return pipe 21 can be adjusted to optimize the treatment effect of the entire system and ensure that the outlet water quality is stable and meets the standards.

[0041] like Figures 1 to 3As shown, the ultrafiltration membranes in the first ultrafiltration tank 15 and the second ultrafiltration tank 16 included in the pretreatment ultrafiltration component 2 are both polyethersulfone hollow fiber membranes, and the ultrafiltration membranes in the first ultrafiltration tank 15 and the second ultrafiltration tank 16 included in the pretreatment ultrafiltration component 2 have a molecular weight cutoff of 100 kDa and a filtration accuracy of 0.01 μm.

[0042] The polyethersulfone hollow fiber membrane was chosen based on its excellent mechanical strength, chemical stability and thermal stability, and can withstand the pressure and chemical corrosion in the water treatment process for a long time. At the same time, the 100kDa molecular weight cut-off and 0.01μm filtration accuracy ensure the effective removal of large molecular impurities such as suspended matter and organic matter, providing high-quality raw water for subsequent treatment steps. In addition, the design of the pretreatment ultrafiltration component 2 also takes into account the needs of easy cleaning and maintenance to ensure the long-term stable operation of the system.

[0043] like Figures 1 to 3 As shown, the ultrafiltration membranes in the first ultrafiltration tank 15 and the second ultrafiltration tank 16 included in the terminal ultrafiltration component 9 are hydrophilic PVDF, and the ultrafiltration membranes in the first ultrafiltration tank 15 and the second ultrafiltration tank 16 included in the terminal ultrafiltration component 9 have a molecular weight cutoff of 5kDa and a filtration accuracy of 0.005μm.

[0044] The choice of hydrophilic PVDF ultrafiltration membrane not only ensures the high purity of water for injection, but also effectively reduces membrane pollution and extends the service life of the membrane due to its good hydrophilic properties. At the same time, the 5kDa molecular weight cut-off and 0.005μm filtration accuracy can accurately remove tiny impurities and bacteria in the water, ensuring that the effluent fully meets the standards for water for injection. In addition, the design of the terminal ultrafiltration component 9 also takes into account the convenience of operation and the stability of the system to ensure that high-quality water for injection can be continuously provided during the continuous production process.

[0045] like Figures 1 to 6 As shown, the electrodeionization component 8 is composed of a continuous electric regeneration mixed bed, and the first pressure tank 801 and the second pressure tank 802 are both filled with anion and cation exchange resins and ion exchange membranes.

[0046] The design of the continuous electric regeneration mixed bed makes full use of the synergistic effect of anion and cation exchange resins and ion exchange membranes to achieve continuous removal and regeneration of ions in water, which not only improves the ion removal efficiency, but also extends the service life of the resin and reduces operating costs. The selection of anion and cation exchange resins, based on their efficient ion exchange capacity and good chemical stability, can ensure efficient ion removal under various water quality conditions. The use of ion exchange membranes further improves the selectivity and efficiency of ion removal, making the effluent water quality more stable and reliable.

[0047] like Figures 1 to 5As shown, the reverse osmosis membrane in the first reverse osmosis tank 606 is a brackish water membrane, and the reverse osmosis membrane in the second reverse osmosis tank 607 is an ultra-low pressure high desalination membrane.

[0048] The selection of brackish water membrane and ultra-low pressure high desalination membrane fully considers the water quality characteristics of raw water and the processing requirements of the system. The brackish water membrane can effectively cope with the higher salt content in the raw water and achieve effective salt retention, while the ultra-low pressure high desalination membrane can achieve a high desalination rate at a lower operating pressure, further improving the water quality of the effluent. The combined use of these two reverse osmosis membranes not only improves the processing capacity of the system, but also optimizes the energy consumption of the system, making the entire preparation process more efficient and energy-saving. In addition, the design of reverse osmosis component 6 also takes into account the needs of easy maintenance and replacement to ensure the long-term stable operation of the system.

[0049] Working principle:

[0050] During operation, first, the raw water enters the pretreatment ultrafiltration component 2 through the raw water tank 1, and is filtered by the ultrafiltration membrane to remove suspended solids and organic matter. Then, the water enters the duplex softener 3 to further remove hardness ions and prevent scaling of the equipment. Next, the water enters the first medium-pressure ultraviolet component 4 to kill microorganisms in the water and ensure the biological safety of the water. By utilizing the ultraviolet light emitted by the first medium-pressure ultraviolet component 4, the free chlorine and combined chlorine compounds in the water undergo photochemical reactions and dissociate, thereby effectively reducing the chlorine content in the water. Under the action of medium-pressure ultraviolet light, ammonia and ammonium ions in the water may undergo a series of photochemical reactions. On the one hand, ultraviolet light directly acts on ammonia or ammonium ions, making them Chemical bonds are broken to produce harmless substances such as nitrogen. On the other hand, strong oxidizing substances such as hydroxyl radicals generated by ultraviolet light may also undergo oxidation reactions with ammonia or ammonium ions, converting them into other forms that are easy to remove, thereby achieving the effect of deammonification and effectively reducing the chlorine content in the water. Subsequently, the water passes through the security filter 5, which serves as the last line of defense for particle removal to ensure the purity of the water entering the reverse osmosis component 6. In the reverse osmosis component 6, the pressure generated by the high-pressure pump 603 transports the water flowing into the water storage tank 602 into the reverse osmosis membrane in the first reverse osmosis tank 606 and the second reverse osmosis tank 607, thereby achieving effective retention of impurities such as dissolved salts and bacteria. The first reverse osmosis tank 606 and the second reverse osmosis tank 607 are used to remove impurities such as dissolved salts and bacteria. The arrangement of the connecting pipe 604, the second connecting pipe 605 and the third connecting pipe 608 ensures the smooth transmission of water between the high-pressure pump 603, the water storage tank 602, the first reverse osmosis tank 606 and the second reverse osmosis tank 607. Then, the water enters the second medium-pressure ultraviolet component 7 and undergoes biosafety treatment again to ensure the sterility of the water. The ultraviolet light emitted by the second medium-pressure ultraviolet component 7 can directly photolyze the organic matter in the water and decompose it into carbon dioxide and water. On the other hand, it can photolyze water molecules to produce charged hydroxyl groups. The hydroxyl groups have strong oxidizing properties and can oxidize and decompose organic matter, thereby reducing the TOC content in the water for injection. Then, the water enters the electrodeionization component 8 and passes through the first pressure The design of the continuous electric regeneration mixed bed in tank 801 and the second pressure tank 802 makes full use of the synergistic effect of anion and cation exchange resins and ion exchange membranes to achieve continuous removal and regeneration of ions in water. Finally, the water passes through the terminal ultrafiltration component 9 for fine filtration to ensure that the effluent meets the standards for water for injection. When the raw water enters the pretreatment ultrafiltration component 2 and the terminal ultrafiltration component 9, the ultrafiltration membrane used in the first ultrafiltration tank 15 and the second ultrafiltration tank 16 included in the pretreatment ultrafiltration component 2 and the terminal ultrafiltration component 9 ensures the effective removal of large molecular impurities such as suspended matter and organic matter, and can accurately remove tiny impurities and bacteria in the water while retaining minerals and trace elements that are beneficial to the human body.

[0051] The above-mentioned front, back, left, right, up and down are all based on the Figure 1As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0053] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A water for injection preparation system based on multi-stage membrane filtration, characterized by: The invention comprises a raw water tank (1) and a mounting frame (10), wherein the raw water tank (1) is fixedly mounted on the left end of the mounting frame (10), a pre-treatment ultrafiltration component (2) is provided on the left end of the mounting frame (10), the raw water tank (1) is connected to the pre-treatment ultrafiltration component (2), a double softener (3) is fixedly mounted on the left end of the mounting frame (10) and the portion close to the left side of the pre-treatment ultrafiltration component (2), the double softener (3) is connected to the pre-treatment ultrafiltration component (2), a first medium-pressure ultraviolet component (4) is fixedly mounted on the middle portion of the mounting frame (10), the first medium-pressure ultraviolet component (4) is connected to the double softener (3), and the first medium-pressure ultraviolet component (4) is mounted on the mounting frame (10). A security filter (5) is provided on the front side of the component (4), and the security filter (5) is connected to the first medium-pressure ultraviolet component (4). The mounting frame (10) is mounted on the right side of the security filter (5) and fixedly mounted with a reverse osmosis component (6). A second medium-pressure ultraviolet component (7) is fixedly mounted on the mounting frame (10) on the right side of the reverse osmosis component (6), and the second medium-pressure ultraviolet component (7) is connected to the reverse osmosis component (6). An electrodeionization component (8) is provided at the right end of the mounting frame (10), and a terminal ultrafiltration component (9) is provided at the right end of the mounting frame (10). The electrodeionization component (8) and the terminal ultrafiltration component (9) are connected to the second medium-pressure ultraviolet component (7).

2. The system for preparing water for injection based on multi-stage membrane filtration according to claim 1, characterized in that: The pretreatment ultrafiltration component (2) and the terminal ultrafiltration component (9) both include a raw water pump (11). Two groups of the raw water pumps (11) are fixedly mounted on a mounting frame (10). Two groups of first pipe networks (12) are fixedly mounted on both the left and right ends of the mounting frame (10). The two groups of the first pipe networks (12) are respectively connected to the two groups of raw water pumps (11). Pressure gauges (13) are mounted on both the two groups of the first pipe networks (12). Multiple groups of solenoid valves (14) are arranged on both the two groups of the first pipe networks (12). The front pipe openings of the two groups of the first pipe networks (12) are both mounted with first ultrafiltration tanks (15) through flanges. The front pipe openings of the two groups of the first pipe networks (12) are both mounted with second ultrafiltration tanks (16) through flanges. The two groups of the first ultrafiltration tanks (15) and the two groups of the second ultrafiltration tanks (16) are arranged in parallel. The right end of the mounting frame (10) is mounted on the raw water pump (11) and a third water delivery pipe (20) is mounted.

3. The system for preparing water for injection based on multi-stage membrane filtration according to claim 1, characterized in that: Two groups of flange interfaces (17) are provided on the rear side of the double softener (3), and the two groups of flange interfaces (17) are respectively connected to the double softener (3) and the left end of the first medium-pressure ultraviolet component (4). A first water pipe (18) is installed on the front side of the right end of the first medium-pressure ultraviolet component (4) through a flange. The front end of the first water pipe (18) is connected to the lower end of the security filter (5) through a flange. A second water pipe (19) is provided at the upper end of the security filter (5), and the second water pipe (19) is connected to the reverse osmosis component (6) through a nut.

4. The system for preparing water for injection based on multi-stage membrane filtration according to claim 1, characterized in that: The reverse osmosis assembly (6) comprises a positioning frame (601), the positioning frame (601) is fixedly mounted on the mounting frame (10), a water storage tank (602) is fixedly mounted on the positioning frame (601), a high-pressure pump (603) is fixedly mounted on the upper side of the positioning frame (601), the high-pressure pump (603) is located on the upper side of the water storage tank (602), a first connecting pipe (604) is mounted on the right end of the water storage tank (602) and the high-pressure pump (603) via a nut, and a second connecting pipe (604) is mounted on the left end of the water storage tank (602) via a nut. 05), a first reverse osmosis tank (606) is fixedly installed on the lower left side of the positioning frame (601), a second reverse osmosis tank (607) is fixedly installed on the lower right side of the positioning frame (601), a third connecting pipe (608) is installed on the upper ends of the first reverse osmosis tank (606) and the second reverse osmosis tank (607) through a nut, a fourth connecting pipe (609) is installed on the opening of the upper right end of the third connecting pipe (608) through a nut, and the fourth connecting pipe (609) is connected to the left end opening of the second medium-pressure ultraviolet component (7) through a flange.

5. The system for preparing water for injection based on multi-stage membrane filtration according to claim 1, characterized in that: The electrodeionization assembly (8) comprises a first pressure tank (801), the first pressure tank (801) being fixedly mounted on a mounting frame (10), a second pressure tank (802) being fixedly mounted on the right end of the mounting frame (10), a second pipe network (803) being mounted on the rear ends of the first pressure tank (801) and the second pressure tank (802) via nuts, a fifth connecting pipe (804) being provided at the left end of the second pipe network (803), the fifth connecting pipe (804) being connected to the right end of the second medium-pressure ultraviolet assembly (7) via a flange, and the right end of the second pipe network (803) being connected to the third water pipe (20) via a flange.

6. The system for preparing water for injection based on multi-stage membrane filtration according to claim 1, characterized in that: A return pipe (21) is fixedly mounted on the rear end of the security filter (5) via a flange, and the left end of the return pipe (21) is fixedly connected to the lower end of the raw water tank (1) via a flange.

7. The system for preparing water for injection based on multi-stage membrane filtration according to claim 2, characterized in that: The ultrafiltration membranes in the first ultrafiltration tank (15) and the second ultrafiltration tank (16) included in the pretreatment ultrafiltration component (2) are both polyethersulfone hollow fiber membranes, and the ultrafiltration membranes in the first ultrafiltration tank (15) and the second ultrafiltration tank (16) included in the pretreatment ultrafiltration component (2) have a molecular weight cutoff of 100 kDa and a filtration accuracy of 0.01 μm.

8. The system for preparing water for injection based on multi-stage membrane filtration according to claim 2, characterized in that: The ultrafiltration membranes in the first ultrafiltration tank (15) and the second ultrafiltration tank (16) included in the terminal ultrafiltration component (9) are hydrophilic PVDF, and the ultrafiltration membranes in the first ultrafiltration tank (15) and the second ultrafiltration tank (16) included in the terminal ultrafiltration component (9) have a molecular weight cutoff of 5 kDa and a filtration accuracy of 0.005 μm.

9. The system for preparing water for injection based on multi-stage membrane filtration according to claim 5, characterized in that: The electrodeionization component (8) is composed of a continuous electric regeneration mixed bed, and the first pressure tank (801) and the second pressure tank (802) are both filled with anion and cation exchange resins and ion exchange membranes.

10. The system for preparing water for injection based on multi-stage membrane filtration according to claim 4, characterized in that: The reverse osmosis membrane in the first reverse osmosis tank (606) is a brackish water membrane, and the reverse osmosis membrane in the second reverse osmosis tank (607) is an ultra-low pressure high desalination membrane.

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