Purified water pretreatment system

Abstract

The invention discloses a purified water pretreatment system, and belongs to the technical field of purified water treatment.The purified water pretreatment system comprises a source water tank, an electrolytic descaling device, a particle filter, an ultraviolet sterilizer, an RO filter, deionizing equipment and a storage tank, the source water tank supplies a water source through a water supply end, and the electrolytic descaling device is communicated with the source water tank through cooperation of a pipeline and a first pump body; water in the source water tank is conveyed into the electrolytic descaling device to be subjected to electrolytic descaling through starting of the first pump body, the particle filter is communicated with the discharge end of the electrolytic descaling device through a pipeline and used for filtering particles in the water subjected to electrolytic descaling, and the ultraviolet sterilizer is communicated with the discharge end of the particle filter through a pipeline and used for sterilizing particles in the water subjected to electrolytic descaling. The electrolytic descaling device is adopted to replace traditional filtering modes such as activated carbon and a softener, regeneration is not needed, dosing and ultrafiltration are not needed, the maintenance and operation cost is reduced, the risk of poor pollution is reduced, and the water quality reaches the WFI standard.

Description

Technical Field

[0001] The invention relates to the technical field of purified water treatment, in particular to a purified water pretreatment system. Background Art

[0002] In pharmaceutical production, purified water is often used as process water, including starting materials for water for injection, washing and cleaning water. With the continuous development of water production technology, the method of preparing water for injection (WFI) using non-distillation technology has been included in the pharmacopoeia of many developed countries. From the development trend, the full membrane method will become the mainstream process, which has stable and reliable control of microbial limits, and the investment cost of large-tonnage equipment is relatively lower than that of traditional processes.

[0003] In the process of preparing purified water, the traditional method is to use a fixed bed activated carbon filter to adsorb organic matter and remove residual chlorine in the water.

[0004] For example, a purified water treatment system disclosed in the Chinese patent with the announcement number CN205024011U includes a raw water tank, a plate heat exchanger, a multi-media filter, an activated carbon filter, a security filter, a primary reverse osmosis device, an EDI device and a purified water storage tank. The raw water tank is connected to the multi-media filter, the raw water tank is connected to the plate heat exchanger, the plate heat exchanger is connected to the multi-media filter, the multi-media filter is connected to the activated carbon filter, the activated carbon filter is connected to the security filter, the security filter is connected to the primary reverse osmosis device, the primary reverse osmosis device is connected to the EDI device, and the EDI device is connected to the purified water storage tank. The raw water stored in the raw water tank passes through the multi-media filter, the activated carbon filter, the security filter, the primary reverse osmosis device and the EDI device in sequence. When the raw water needs to be heated, the raw water is fed into the plate heat exchanger. After the raw water is heated, it is fed to the multi-media filter for treatment.

[0005] However, activated carbon has a very high specific surface area, and a large number of microorganisms are easily attached to its gaps, making it an important source of microbial pollution. Therefore, the full membrane method eliminates the activated carbon filter and replaces it with an ultrafilter. However, the softener is also a fixed bed filter and there is also a risk of microbial contamination.

[0006] For this purpose, we offer a purified water pretreatment system. Summary of the invention

[0007] To this end, the present invention provides a purified water pretreatment system to solve the above-mentioned problems.

[0008] The present invention provides the following technical solutions: a purified water pretreatment system, comprising a source water tank, an electrolytic descaling device, a particle filter, an ultraviolet sterilizer, an RO filter, a deionizing device and a storage tank, wherein the source water tank is supplied with water through a water supply end, the water supply end is a municipal water supply, which has been initially filtered and contains relatively few impurities, and has the advantages of being easy to obtain, low cost and high quality as a water source, the electrolytic descaling device is connected to the source water tank through a pipeline and a first pump body, and the water in the source water tank is transported to the electrolytic descaling device for electrolytic descaling by opening the first pump body, and the specific principle of the electrolytic descaling device is that a reaction chamber formed by a metal cylinder is used as a cathode, and a titanium electrode in the middle is used as an anode, and an electric current passes through water to decompose water molecules into OH- and H+, thereby increasing the pH value inside the cathode, and the high pH value promotes hardness precipitation, and scale is formed on the cathode and removed from the water, and since some scale has been removed from the circulating water, the scale will not be precipitated on the RO membrane of the subsequent RO filter, and the following formula represents the chemical reaction that occurs: Ca 2+ +2HCO3 - →CaCO3+CO2+H2O Ca 2+ +CO3 2- →CaCO3 In addition, the process also reduces contaminants with high silica, ferrite and manganese content. This is a special advantage. Traditionally, it is difficult to remove these impurities using softeners or without adding antiscaling agents. In the electroscaling device, the equipment removes the scale on the cathode by reversing the current, causing it to fall off in the water and then be flushed out. Another advantage of the electroscaling device is that it can activate the chloride in the water into free chlorine, that is, the following chemical reaction occurs: Cl - +H + →HCl HCl+HCl→Cl2+H2 This free chlorine byproduct disinfects the system and destroys biofilms as long as the system is running. In a subsequent step, medium-pressure ultraviolet (UV) light removes the residual chlorine, fully sterilizing the water while protecting the RO membrane from the effects of residual chlorine.

[0009] The particle filter is connected to the discharge end of the electrolytic descaling device through a pipeline, and is used to filter particulate matter in the water after electrolytic descaling. The ultraviolet sterilizer is connected to the discharge end of the particle filter through a pipeline, releases medium-pressure ultraviolet rays to sterilize the water, and utilizes ultraviolet rays to irradiate microorganisms in the water, destroys the cell structure in the microbial DNA, and makes them lose their reproductive ability, thereby achieving the effect of killing microorganisms. It has high energy, can destroy the cell walls and nucleic acids of microorganisms, and effectively kill bacteria, viruses, algae, and drug-resistant microorganisms. It will not produce harmful by-products and has no negative impact on water quality.

[0010] The RO filter is connected to the discharge end of the ultraviolet sterilizer through the cooperation of the pipeline and the second pump body. Under the drive of the second pump body, the water sterilized by the ultraviolet sterilizer is transported to the RO filter for deep filtration. It uses the selective permeability of the semipermeable membrane to only allow water molecules to pass through, while preventing soluble solids, organic matter, bacteria, viruses and other impurities in the water from passing through. Under the action of pressure, water molecules pass through the semipermeable membrane into the water production side, while impurities are retained on the concentrated water side, thereby achieving water purification. Almost all impurities in the water can be removed, including heavy metals, bacteria, viruses, pesticide residues, etc., and the purified water produced is safer and more hygienic.

[0011] The deionization device is connected to the RO filter through a pipeline. The deionization device is specifically a CDI or EDI device. The CDI technology can effectively remove metal ions such as calcium and magnesium in water, solve the problem of water hardness, and is suitable for softening common hard water such as tap water, surface water, and river water. Although the CDI technology has certain requirements for influent water, compared with the EDI technology, its requirements for influent water are relatively lower, so it is suitable for some occasions where the requirements for influent water quality are not very strict. The EDI device can produce ultrapure water with a resistivity of up to 16-18MΩ·CM, which is suitable for fields such as electricity, electronics, medicine, chemical industry, food and laboratories, especially occasions requiring high-quality ultrapure water, and is used for removing ions in water. The EDI technology has very strict requirements for influent water, and needs to control lower indicators such as conductivity and metal ion content to ensure the quality of effluent water. It is suitable for occasions with extremely high requirements for influent water quality. The selection of the deionization device can be selected according to actual conditions. The storage tank is connected to the discharge end of the deionization device through a pipeline for storing treated purified water.

[0012] As a preferred solution of the present invention, a return pipe is provided between the RO filter and the source water tank, and between the deionization device and the source water tank, so that insufficiently treated water can enter the source water tank through the return pipe for secondary circulation treatment. In actual application, water quality monitoring instruments can be added to each pipe connection. If the water quality does not meet the requirements, the water source can be controlled to reflux through the return pipe for secondary circulation treatment to ensure that the water quality can be fully purified to obtain purified water.

[0013] As a preferred solution of the present invention, the electrolytic descaling device specifically uses a reaction chamber formed by a metal cylinder as a cathode and a titanium electrode in the middle as an anode. The current passes through the water to decompose water molecules into OH- and H+, thereby increasing the pH value inside the cathode. The high pH value promotes hardness precipitation, and scale is formed on the cathode and removed from the water.

[0014] As a preferred solution of the present invention, a heat exchange pipeline is arranged between the particle filter and the source water tank, and a heat exchange component is arranged in the heat exchange pipeline. The heat exchange component is composed of a heat exchanger and a hot water discharge end and a hot water inlet end respectively located at both ends of the heat exchanger. The setting of the heat exchange component can effectively heat up or cool down the water. It is at the front end of the ultraviolet sterilizer in the overall pipeline. When the water temperature is too high, although the activity of microorganisms is enhanced, it may also cause damage to the ultraviolet sterilization equipment, thereby affecting its sterilization efficiency and service life. When the water temperature is too low, the activity of microorganisms is reduced and their resistance to ultraviolet rays is enhanced. At the same time, low temperature may also affect the output intensity of the ultraviolet lamp, thereby reducing the sterilization effect. When the temperature is below 0°C, the sterilization effect may be completely lost. Therefore, the setting of the heat exchange component can regulate the water source temperature, which helps to further improve the sterilization efficiency.

[0015] As a preferred solution of the present invention, the ultraviolet sterilizer is specifically a medium-pressure ultraviolet sterilizer. The medium-pressure ultraviolet light can output multi-spectrum continuous ultraviolet light, including multiple wavelengths in the range of 100-400nm, effectively destroying microbial DNA and achieving a sterilization rate of more than 99.9%.

[0016] As a preferred solution of the present invention, the deionization equipment is specifically a CDI or EDI equipment. CDI technology can effectively remove metal ions such as calcium and magnesium in water, solve the problem of water hardness, and is suitable for softening common hard water such as tap water, surface water, and river water. Although CDI technology has certain requirements for influent water, compared with EDI technology, its requirements for influent water are relatively lower. Therefore, it is suitable for some occasions that do not have very strict requirements on influent water quality. EDI equipment can produce ultrapure water with a resistivity of up to 16-18MΩ·CM, which is suitable for fields such as electricity, electronics, medicine, chemical industry, food and laboratories, especially occasions that require high-quality ultrapure water. It is used for removing ions in water. EDI technology has very strict requirements for influent water, and needs to control lower indicators such as conductivity and metal ion content to ensure effluent water quality. It is suitable for occasions with extremely high requirements on influent water quality. The choice of deionization equipment can be selected according to actual conditions.

[0017] As a preferred solution of the present invention, the water supply end is specifically municipal water supply. The municipal water supply has been initially filtered and contains relatively few impurities. As a water source, it has the advantages of being easy to obtain, low cost and high quality.

[0018] The beneficial effects of the present invention are as follows: 1. The present invention adopts an electrolytic descaling device to replace traditional filtration methods such as activated carbon and softener. It does not require regeneration, dosing, or ultrafiltration, which reduces maintenance and operating costs, and reduces the risk of poor pollution, so that the water quality meets the WFI standard.

[0019] 2. The present invention adds a heat exchange component in the heat exchange pipeline, which can effectively heat up or cool down the water. It is located at the front end of the ultraviolet sterilizer in the overall pipeline and can regulate the water source temperature, which helps to ensure the sterilization efficiency of the ultraviolet sterilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is the overall framework diagram of the present invention.

[0022] Legend: 1. Source water tank; 2. Electrolytic descaling device; 3. Particle filter; 4. Ultraviolet sterilizer; 5. RO filter; 6. Deionization equipment; 7. Storage tank; 8. First pump body; 9. Second pump body; 10. Water supply end; 11. Heat exchanger; 12. Hot water discharge end; 13. Hot water inlet end. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Specific examples are given below.

[0025] like Figure 1 As shown, a purified water pretreatment system includes a source water tank 1, an electrolytic descaling device 2, a particle filter 3, an ultraviolet sterilizer 4, an RO filter 5, a deionization device 6 and a storage tank 7. The source water tank 1 is supplied with water through a water supply end 10. The water supply end 10 is a municipal water supply, which has been initially filtered and contains relatively few impurities. As a water source, it has the advantages of being easy to obtain, low cost and high quality. The electrolytic descaling device 2 is connected to the source water tank 1 through a pipeline and a first pump body 8. The water in the source water tank 1 is transported to the electrolytic descaling device 2 for electrolytic descaling by opening the first pump body 8. The specific principle of the electrolytic descaling device 2 is that the reaction chamber formed by a metal cylinder is used as a cathode, and the titanium electrode in the middle is used as an anode. The current passes through the water to decompose the water molecules into OH- and H+, thereby increasing the pH value inside the cathode. The high pH value promotes hardness precipitation. Scale will form on the cathode and be removed from the water. Since some scale has been removed from the circulating water, the scale will not be precipitated on the RO membrane of the subsequent RO filter 5. The following formula represents the chemical reaction that occurs: Ca 2+ +2HCO3 - →CaCO3+CO2+H2O Ca 2+ +CO3 2- →CaCO3 In addition, the process also reduces contaminants with high silica, ferrite and manganese content. This is a special advantage. Traditionally, it is difficult to remove these impurities using softeners or without adding antiscaling agents. In the electrolytic descaling device 2, the equipment removes the scale on the cathode by reversing the current, causing it to fall off in the water and then be flushed out. Another advantage of the electrolytic descaling device 2 is that it can activate the chloride in the water into free chlorine, that is, the following chemical reaction occurs: Cl - +H + →HCl HCl+HCl→Cl2+H2 As long as the system is running, this free chlorine byproduct will disinfect the system and destroy the biofilm. In the subsequent process, medium pressure UV will eliminate the residual chlorine, which can fully sterilize the water while protecting the RO membrane from the effects of residual chlorine.

[0026] The particle filter 3 is connected to the discharge end of the electrolytic descaling device 2 through a pipeline, and is used to filter the particulate matter in the water after electrolytic descaling. The ultraviolet sterilizer 4 is connected to the discharge end of the particle filter 3 through a pipeline, and releases medium-pressure ultraviolet rays to sterilize the water. The ultraviolet rays are used to irradiate the microorganisms in the water, and the cell structure in the DNA of the microorganisms is destroyed, so that the microorganisms lose their reproductive ability, thereby achieving the effect of killing the microorganisms. It has high energy, can destroy the cell walls and nucleic acids of microorganisms, effectively kill bacteria, viruses, algae, and drug-resistant microorganisms, and will not produce harmful by-products, and has no negative impact on water quality. It should be noted that the number of particle filters 3 of the present application is two, and their filtration precisions are 10 microns and 3 microns respectively.

[0027] The RO filter 5 is connected to the discharge end of the ultraviolet sterilizer 4 through the cooperation of the pipeline and the second pump body 9. Driven by the second pump body 9, the water sterilized by the ultraviolet sterilizer 4 is transported to the RO filter 5 for deep filtration. It uses the selective permeability of the semipermeable membrane to only allow water molecules to pass through, while preventing soluble solids, organic matter, bacteria, viruses and other impurities in the water from passing through. Under the action of pressure, water molecules pass through the semipermeable membrane into the water production side, while impurities are retained on the concentrated water side, thereby achieving water purification. Almost all impurities in the water can be removed, including heavy metals, bacteria, viruses, pesticide residues, etc., and the purified water produced is safer and more hygienic.

[0028] The deionization device 6 is connected to the RO filter 5 through a pipeline. The deionization device 6 is specifically a CDI or EDI device. The CDI technology can effectively remove metal ions such as calcium and magnesium in water, solve the problem of water hardness, and is suitable for softening common hard water such as tap water, surface water, and river water. Although the CDI technology has certain requirements for influent water, compared with the EDI technology, its requirements for influent water are relatively lower. Therefore, it is suitable for some occasions where the requirements for influent water quality are not very strict. The EDI device can produce ultrapure water with a resistivity of up to 16-18MΩ·CM, which is suitable for fields such as electricity, electronics, medicine, chemical industry, food and laboratories, especially occasions that require high-quality ultrapure water, and is used for water ion removal. The EDI technology has very strict requirements for influent water, and needs to control lower indicators such as conductivity and metal ion content to ensure the effluent water quality. It is suitable for occasions with extremely high requirements for influent water quality. The selection of the deionization device 6 can be selected according to actual conditions. The storage tank 7 is connected to the discharge end of the deionization device 6 through a pipeline for storing treated purified water.

[0029] A reflux pipe is provided between the RO filter 5 and the source water tank 1, and between the deionization device 6 and the source water tank 1, so that insufficiently treated water can enter the source water tank 1 through the reflux pipe for secondary circulation treatment. In actual application, water quality monitoring instruments can be added to each pipe connection. If the water quality does not meet the requirements, the water source can be controlled to reflux through the reflux pipe for secondary circulation treatment to ensure that the water quality can be fully purified to obtain purified water.

[0030] The electrolytic descaling device 2 specifically uses a reaction chamber formed by a metal cylinder as a cathode and a titanium electrode in the middle as an anode. The current passes through the water to decompose the water molecules into OH- and H+, thereby increasing the pH value inside the cathode. The high pH value promotes hardness precipitation, and scale will form on the cathode and be removed from the water.

[0031] A heat exchange pipeline is arranged between the particle filter 3 and the source water tank 1, and a heat exchange component is arranged in the heat exchange pipeline. The heat exchange component is composed of a heat exchanger 11 and a hot water discharge end 12 and a hot water inlet end 13 respectively located at both ends of the heat exchanger 11. The setting of the heat exchange component can effectively heat up or cool down the water. It is located at the front end of the ultraviolet sterilizer 4 in the overall pipeline. When the water temperature is too high, although the activity of microorganisms is enhanced, it may also cause damage to the ultraviolet sterilization equipment, thereby affecting its sterilization efficiency and service life. When the water temperature is too low, the activity of microorganisms is reduced and the resistance to ultraviolet rays is enhanced. At the same time, low temperature may also affect the output intensity of the ultraviolet lamp, thereby reducing the sterilization effect. When the temperature is below 0°C, the sterilization effect may be completely lost. Therefore, the setting of the heat exchange component can regulate the water source temperature, which helps to further improve the sterilization efficiency.

[0032] The ultraviolet sterilizer 4 is specifically a medium-pressure ultraviolet sterilizer. The medium-pressure ultraviolet light can output multi-spectrum continuous ultraviolet light, including multiple wavelengths in the range of 100-400nm, which can effectively destroy the DNA of microorganisms and achieve a sterilization rate of more than 99.9%.

[0033] The deionization device 6 is specifically a CDI or EDI device. CDI technology can effectively remove metal ions such as calcium and magnesium in water and solve the problem of water hardness. It is suitable for softening common hard water such as tap water, surface water, and river water. Although CDI technology has certain requirements for influent water, compared with EDI technology, its requirements for influent water are relatively lower. Therefore, it is suitable for some occasions that do not have very strict requirements on influent water quality. EDI equipment can produce ultrapure water with a resistivity of up to 16-18MΩ·CM, which is suitable for fields such as electricity, electronics, medicine, chemical industry, food and laboratories, especially occasions that require high-quality ultrapure water. It is used for removing ions in water. EDI technology has very strict requirements for influent water and needs to control lower indicators such as conductivity and metal ion content to ensure the effluent water quality. It is suitable for occasions with extremely high requirements on influent water quality. The choice of deionization device 6 can be selected according to actual conditions.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A purified water pretreatment system, characterized in that: include: A source water tank (1) supplies water via a water supply end (10); The electrolytic descaling device (2) is connected to the source water tank (1) through the cooperation of a pipeline and a first pump body (8), and the water in the source water tank (1) is transported to the electrolytic descaling device (2) for electrolytic descaling by opening the first pump body (8); A particle filter (3) is connected to the discharge end of the electrolytic descaling device (2) through a pipeline and is used to filter particles in the water after the electrolytic descaling; An ultraviolet sterilizer (4) is connected to the discharge end of the particle filter (3) through a pipeline, and releases medium-pressure ultraviolet rays to sterilize the water; The RO filter (5) is connected to the discharge end of the ultraviolet sterilizer (4) through the cooperation of a pipeline and a second pump body (9), and under the drive of the second pump body (9), the water sterilized by the ultraviolet sterilizer (4) is transported to the RO filter (5) for deep filtration; A deionization device (6), connected to the RO filter (5) via a pipeline, for removing ions from water; The storage tank (7) is connected to the discharge end of the deionization device (6) through a pipeline and is used for storing the treated purified water.

2. The purified water pretreatment system according to claim 1, characterized in that: A return pipe is provided between the RO filter (5) and the source water tank (1), and between the deionization device (6) and the source water tank (1), for allowing insufficiently treated water to enter the source water tank (1) through the return pipe for secondary circulation treatment.

3. The purified water pretreatment system according to claim 1, characterized in that: The electrolytic descaling device (2) specifically uses a reaction chamber formed by a metal cylinder as a cathode and a titanium electrode in the middle as an anode. Electric current passes through water to decompose water molecules into OH- and H+, thereby increasing the pH value inside the cathode. The high pH value promotes hardness precipitation, and scale is formed on the cathode and removed from the water.

4. The purified water pretreatment system according to claim 1, characterized in that: A heat exchange pipeline is provided between the particle filter (3) and the source water tank (1), and a heat exchange component is provided in the heat exchange pipeline.

5. The purified water pretreatment system according to claim 4, characterized in that: The heat exchange component is composed of a heat exchanger (11) and a hot water discharge end (12) and a hot water inlet end (13) respectively located at two ends of the heat exchanger (11).

6. The purified water pretreatment system according to claim 1, characterized in that: The ultraviolet sterilizer (4) is specifically a medium-pressure ultraviolet sterilizer.

7. The purified water pretreatment system according to claim 1, characterized in that: The deionization device (6) is specifically a CDI or EDI device.

8. The purified water pretreatment system according to claim 1, characterized in that: The water supply end (10) is specifically a municipal water supply.

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