Healthy direct drinking water system with adjustable effluent quality

Abstract

The invention relates to the technical field of healthy direct drinking water treatment, and discloses an effluent quality adjustable healthy direct drinking water system, which comprises a pre-filter, an active carbon filter, an ultrafiltration membrane assembly, a reverse osmosis membrane assembly and an ultraviolet sterilizer, the water inlet end of the pre-filter is connected with a municipal tap water pipe network, the water outlet end of the pre-filter is connected with the water inlet of the activated carbon filter, the water outlet of the activated carbon filter is connected with the water inlet of the ultrafiltration membrane assembly, and the water outlet of the ultrafiltration membrane assembly is divided into two paths through a tee joint, a water outlet of the reverse osmosis membrane assembly is connected with a second water inlet of the produced water mixer, and a water outlet of the produced water mixer is connected with a direct drinking water faucet through an ultraviolet sterilizer. According to the invention, the adjustability of the effluent quality is realized, different effluent hardness and soluble total solids can be set according to different users, and healthy direct drinking water containing beneficial elements such as calcium and magnesium is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of healthy direct drinking water treatment, and particularly relates to a healthy direct drinking water system with adjustable water quality of the effluent. Background Art

[0002] With the improvement of people's requirements for the quality of life, direct drinking water has become an essential facility in modern families and public places. However, existing direct drinking water products often pursue the "pure water" effect of product water quality, while ignoring health problems.

[0003] According to the requirements of the "Sanitary Standard for Drinking Water in China" (GB5749-2022), the total hardness of drinking water shall not exceed the limit value of 450 mg / L, and the limit value of total dissolved solids (TDS) is 1000 mg / L. In the industry standard of direct drinking water, "Drinking Water Quality Standard" (CJ94-2005), the limit value of total hardness is 300 mg / L, and the limit value of total dissolved solids (TDS) is 500 mg / L. The World Health Organization (WHO) recommends that the calcium hardness in drinking water is 40-80 mg / L, the magnesium hardness is not less than 10 mg / L, the total dissolved solids is not less than 100 mg / L, and it is suitable for 250-500 mg / L. At present, domestic direct drinking water machine products advocate purity. Taking the most common reverse osmosis water purifier in the market as an example, the total salt content (TDS) of its product water is usually only 20-30 mg / L, and the hardness is even lower. However, its impact on human health cannot be underestimated, and it is also an indispensable part of our health puzzle. For example, calcium is the cornerstone of the human skeleton and teeth. Calcium in hardness exists in ionic form, and compared with calcium in food, calcium in water is more easily absorbed by the human body. For growing children, drinking hard water in moderation can provide an additional calcium source for bone development and contribute to the healthy growth of bones. As adults age, bone mass will gradually decrease. For the elderly, calcium in hard water can, to a certain extent, help maintain bone density and slow down the process of osteoporosis. Every bit of additional calcium intake may play a role in the fight against bone loss. Magnesium ions are also of great significance. It plays a key role in maintaining the normal rhythm of the heart. Magnesium can regulate the excitability of cardiomyocytes, keep the systolic and diastolic functions of the heart stable, maintain the normal heart rhythm, and thus reduce the risk of cardiovascular diseases such as arrhythmia. At the same time, magnesium also participates in the relaxation regulation of vascular smooth muscle and helps maintain normal blood pressure levels.

[0004] Therefore, it is of great significance to develop a healthy direct drinking water system with adjustable effluent hardness, stable operation, safety and reliability. It can not only ensure that the human body obtains a certain amount of beneficial elements such as calcium and magnesium from water, but also avoid health risks caused by too high hardness. Summary of the Invention

[0005] The present invention provides a healthy direct drinking water system with adjustable water quality at the outlet, which realizes the adjustability of the water quality at the outlet and can set different water hardness and total dissolved solids at the outlet according to different user groups, and provides healthy direct drinking water containing a certain amount of beneficial elements such as calcium and magnesium.

[0006] The present invention provides a healthy direct drinking water system with adjustable water quality at the outlet, comprising a pre-filter, an activated carbon filter, an ultrafiltration membrane module, a reverse osmosis membrane module, and an ultraviolet disinfection device;

[0007] The inlet end of the pre-filter is connected to the municipal tap water pipe network, the outlet end of the pre-filter is connected to the inlet of the activated carbon filter, the outlet of the activated carbon filter is connected to the inlet of the ultrafiltration membrane module, the outlet of the ultrafiltration membrane module is divided into two paths through a tee. One path is connected to the inlet of the reverse osmosis membrane module through a booster pump, and the other path is connected to the first inlet of the water production mixer through a bypass RO solenoid valve. The outlet of the reverse osmosis membrane module is connected to the second inlet of the water production mixer, and the outlet of the water production mixer is connected to the direct drinking water faucet through the ultraviolet disinfection device.

[0008] Further, a manual ball valve for maintenance is provided on the pipeline connecting the municipal tap water pipe network and the pre-filter, and a pressure switch device is provided to stop the operation of the system when the pressure is lower than the set value.

[0009] Further, the pre-filter is provided with a sewage outlet, and a manual flushing and discharge valve is provided at the sewage outlet.

[0010] Further, a water inlet solenoid valve is provided on the pipeline between the pre-filter and the activated carbon filter for automatic control of the start and stop of the system; the activated carbon filter includes an activated carbon filter element and a filter housing, and the housing is provided with an inlet and an outlet, and all the water entering the activated carbon filter passes through the activated carbon filter element and then converges to the outlet of the activated carbon filter.

[0011] Further, the ultrafiltration membrane module includes an ultrafiltration membrane housing and ultrafiltration membrane elements. The ultrafiltration membrane housing is provided with a sewage outlet. The ultrafiltration membrane elements adopt PVDF hollow fiber membrane filaments. During filtration, all the inlet water passes through the ultrafiltration membrane elements, and the filtration accuracy reaches 20-30 nm. A manual valve and a solenoid valve are provided on the sewage outlet of the ultrafiltration membrane module to automatically open the solenoid valve for sewage discharge according to the cumulative working time and pressure loss of the ultrafiltration membrane.

[0012] Further, the booster pump is used to boost the water production of the ultrafiltration membrane module to overcome the osmotic pressure of the reverse osmosis membrane. The booster pump adopts a small pipeline pump, and a pressure switch and an RO inlet solenoid valve are arranged on its inlet pipe. The flow rate of the booster pump is selected according to the system flow rate, and the head of the booster pump is determined according to the transmembrane pressure difference of the membrane element. The operating pressure of the pipeline after boosting is 0.6 - 0.8 MPa. The booster pump has a frequency conversion function and can adjust the frequency of the pump group according to the pressure behind the pump.

[0013] Further, the reverse osmosis membrane module includes a reverse osmosis membrane shell and membrane elements. The membrane elements adopt ultra-low pressure reverse osmosis membranes; the reverse osmosis membrane module is provided with a waste water outlet, and a waste water ratio flushing solenoid valve group is arranged at the waste water outlet, which can control the ratio of water production to waste water to be maintained at 1 - 2:1; a pressure switch is arranged on the pipeline connecting the reverse osmosis membrane module and the water production mixer.

[0014] Further, the water production mixer can make the liquid of any inlet enter the outlet pipe completely, or the liquids of both inlets enter the outlet pipe by adjusting the dial; by adjusting the dial, the actual flow cross-sectional areas of the two different inlets can be adjusted, so as to realize the flow rate adjustment of the two liquids, and thus adjust the hardness and total salt content of the water production.

[0015] A conductivity water quality monitoring module is arranged on the outlet pipeline of the water production mixer, which is used to detect the total dissolved solids index of the mixed water production in real time.

[0016] Further, the ultraviolet disinfection device adopts a pipeline type, and the ultraviolet disinfection dose is not less than 40 mJ / cm 2 .

[0017] Further, the direct drinking water faucet is provided with an initial sewage discharge solenoid valve and a direct drinking water solenoid valve. After the system starts to produce water each time, the control module automatically opens the initial sewage discharge solenoid valve for 2 - 3 seconds to discharge the initial water production, and then automatically opens the direct drinking water solenoid valve and closes the initial drainage solenoid valve to ensure the safety of drinking water.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a healthy direct drinking water system with adjustable water quality, which comprises a pre-filter, an activated carbon filter, an ultrafiltration membrane module, a reverse osmosis membrane module, an ultraviolet disinfection device, a water quality monitoring module and a pipeline system. The hardness and total dissolved solids of the final produced water are controlled within a healthy range through a water production mixer. The pre-filter is connected to the municipal tap water network at its water inlet end. The water outlet of the ultrafiltration membrane module is divided into two paths through a tee. One path is connected to the water inlet of the reverse osmosis membrane module through a booster pump, and the other path is connected to the first water inlet of the water production mixer through a bypass RO solenoid valve. The water outlet of the water production mixer is connected to a direct drinking water faucet through the ultraviolet disinfection device, thereby realizing the adjustability of the water quality of the produced water. Different water hardness and total dissolved solids can be set according to different user groups, ensuring that the human body obtains a certain amount of beneficial elements such as calcium and magnesium from the water and avoiding health risks caused by excessive hardness. It is a healthy direct drinking water system with stable operation, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the healthy direct drinking water system with adjustable water quality of the present invention.

[0021] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The present invention can adjust the water quality of the produced water. It not only ensures the safety and reliability of the direct drinking water quality through multiple technical barriers, but also can adjust the hardness and salt content indexes of the water quality of the produced water according to user needs, making the produced water healthier. It provides an ultrafiltration and reverse osmosis dual-membrane direct drinking water treatment system and a control method, which can realize the adjustability of the water quality of the produced water. Different water hardness and total dissolved solids can be set according to different user groups, and healthy direct drinking water containing a certain amount of beneficial elements such as calcium and magnesium is provided.

[0024] The present invention provides a healthy direct drinking water system with adjustable water quality, including a pre-filter, an activated carbon filter, an ultrafiltration membrane module, a reverse osmosis membrane module, an ultraviolet disinfection device, a water quality monitoring module and a pipeline system, and controls the hardness and total dissolved solids of the final produced water within a healthy range through a water production mixer.

[0025] The overall connection relationship is as Figure 1 shown:

[0026] The water inlet end of the pre-filter is connected to the municipal tap water pipe network. The water outlet end of the pre-filter is connected to the water inlet of the activated carbon filter. The water outlet of the activated carbon filter is connected to the water inlet of the ultrafiltration membrane module. The water outlet of the ultrafiltration membrane module is divided into two paths through a tee. One path passes through a booster pump and is connected to the water inlet of the reverse osmosis membrane module. The other path is connected to the first water inlet of the water production mixer through a bypass RO solenoid valve. The water outlet of the reverse osmosis membrane module is connected to the second water inlet of the water production mixer. The water outlet of the water production mixer is connected to a direct drinking water faucet through the ultraviolet disinfection device.

[0027] 1. Pre-filter:

[0028] In one embodiment, the raw water of the system comes from the municipal tap water pipe network and has a certain operating pressure, usually 0.1 - 0.5 MPa. A manual ball valve for maintenance is provided on the pipeline connecting the municipal tap water pipe network and the pre-filter, and a pressure switch device is provided to stop the operation of the system when the pressure is lower than the set value.

[0029] In one embodiment, the raw water from the municipal tap water pipe network first enters the pre-filter, which intercepts large particulate matters such as sediment, rust, and insect eggs in the tap water, preventing these impurities from entering the subsequent system and extending the service life of the equipment. Usually, the filtration accuracy is less than 50 μm. The pre-filter is provided with a sewage outlet, and a manual flushing and discharge valve is provided at the sewage outlet, which needs to be flushed regularly to ensure its filtration effect. The pre-filter can replace the PP filter element of a conventional water purifier, reducing the filter element replacement cost.

[0030] 2. Activated carbon filter:

[0031] In one embodiment, the water outlet of the pre-filter enters the pre-activated carbon filter, whose main purpose is to adsorb residual chlorine, organic matters, and possible odor substances in the tap water, purifying the water quality while protecting the subsequent membrane system. The activated carbon filter includes an activated carbon filter element and a filter housing. The housing is provided with a water inlet and a water outlet. All the water entering the activated carbon filter passes through the activated carbon filter element and then converges at the water outlet of the activated carbon filter. The activated carbon filter element meets the national standard. An inlet solenoid valve is provided on the pipeline between the pre-filter and the activated carbon filter for automatic control of the start and stop of the system, and the activated carbon filter element needs to be replaced regularly.

[0032] 3. Ultrafiltration membrane module:

[0033] In one embodiment, the effluent of the activated carbon filter enters the ultrafiltration membrane module, which consists of an ultrafiltration membrane housing and ultrafiltration membrane elements. The ultrafiltration membrane module is provided with three interfaces: an inlet, an outlet, and a wastewater drain port. The ultrafiltration membrane can adopt PVDF hollow fiber membrane filaments. During filtration, all the influent passes through the ultrafiltration membrane elements, and the filtration accuracy can reach 20 - 30 nm, with impurities being retained on the membrane surface. A manual valve and a solenoid valve are set on the wastewater drain port, and the solenoid valve is automatically opened for sewage discharge according to the cumulative working time and pressure loss of the ultrafiltration membrane.

[0034] In one embodiment, the booster pump is used to boost the water production of the ultrafiltration membrane module to overcome the osmotic pressure of the reverse osmosis membrane. The booster pump adopts a small pipeline pump, and a pressure switch and an RO influent solenoid valve are set on its inlet pipe. The flow rate of the booster pump is selected according to the system flow rate, and the head of the booster pump is determined according to the transmembrane pressure difference of the membrane elements. The operating pressure of the pressurized pipeline is about 0.6 - 0.8 MPa. The booster pump should have a frequency conversion function and can adjust the pump group frequency according to the pressure behind the pump.

[0035] 4> Reverse osmosis membrane module:

[0036] In one embodiment, the reverse osmosis membrane module mainly includes a reverse osmosis membrane housing and membrane elements. The reverse osmosis membrane adopts an ultra-low pressure reverse osmosis membrane with a service life of 2 - 3 years, and the system desalination rate is not less than 97%. The reverse osmosis membrane module is provided with three interfaces, namely an inlet, a water production outlet, and a wastewater outlet. The inlet is connected to the outlet pipe of the booster pump, the water production outlet is connected to the water production mixer, and a wastewater ratio flushing solenoid valve group is set on the wastewater outlet. The wastewater ratio flushing valve can control the ratio of water production to wastewater, usually maintained at 1 - 2:1. To ensure safe operation, a pressure switch is set on the pipeline connecting the reverse osmosis membrane module and the water production mixer.

[0037] In one embodiment, the water production of the reverse osmosis membrane module and the water production of part of the ultrafiltration membrane module converge at the water production mixer. The water production mixer is provided with two inlets, which are respectively connected to the water production of the ultrafiltration membrane module and the water production of the reverse osmosis membrane module; it is provided with one outlet, and the water production of the ultrafiltration membrane module and the water production of the reverse osmosis membrane module are taken out after mixing in the mixer; the water production mixer can make all the liquid from any inlet enter the outlet pipe, or the liquid from both inlets enter the outlet pipe by adjusting the dial; by adjusting the dial, the actual flow cross-sectional areas of the two different inlets can be adjusted, so as to realize the flow rate adjustment of the two liquids, and thus adjust the hardness and total salt content of the water production. An electric conductivity water quality monitoring module is set on the outlet pipeline of the water production mixer for real-time detection of the total dissolved solids index of the mixed water production.

[0038] 5> Ultraviolet disinfection device:

[0039] In one embodiment, the produced water with adjusted water quality after passing through the produced water mixer enters the faucet of the direct drinking water system after passing through the ultraviolet disinfection device; the ultraviolet disinfection device is of a pipeline type, and the ultraviolet disinfection dose should not be less than 40 mJ / cm2. The ultraviolet disinfection equipment should have an inspection report on the effective dose issued by an independent third party (i.e., a biological assay dose report).

[0040] In one embodiment, the directly drinking water after ultraviolet disinfection enters the faucet. To ensure that the directly drinking water produced has no end - pipe water that has not been disinfected or has been stored for more than half an hour, an initial sewage discharge solenoid valve is added in front of the faucet. After the system starts to produce water each time, the control module automatically opens the initial sewage discharge valve for 2 - 3 seconds to discharge the initial produced water, and then automatically opens the direct drinking water solenoid valve and closes the initial drainage solenoid valve to ensure the safety of the drinking water.

[0041] In the present invention, all the water - related products in the system should comply with the provisions of the current national standard "Safety Evaluation Standard for Drinking Water Distribution Equipment and Protective Materials" GB / T 17219.

[0042] The present invention provides a pre - filter, an activated carbon filter, an ultra - filtration membrane module, a reverse - osmosis membrane module, and an ultraviolet disinfection device connected in sequence. The water inlet end of the pre - filter is connected to the municipal tap water pipe network. The water outlet of the ultra - filtration membrane module is divided into two paths through a tee. One path is connected to the water inlet of the reverse - osmosis membrane module through a booster pump, and the other path is connected to the first water inlet of the produced water mixer through a bypass RO solenoid valve. The water outlet of the produced water mixer is connected to the direct drinking water faucet through the ultraviolet disinfection device, thereby realizing the adjustability of the water quality of the outlet water. Different outlet water hardness and total dissolved solids can be set according to different user groups, ensuring that the human body obtains a certain amount of beneficial elements such as calcium and magnesium from the water and avoiding health risks caused by too high hardness. It is a healthy direct drinking water system with stable operation, safety and reliability.

[0043] It should be noted that in this article, the terms "include", "comprise" or any other variants thereof are intended to cover non - exclusive inclusion, so that a process, device, article or method including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, device, article or method. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, device, article or method including that element.

[0044] The above - mentioned are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A healthy direct drinking water system with adjustable water outlet quality, characterized in that, It includes a pre-filter, an activated carbon filter, an ultrafiltration membrane module, a reverse osmosis membrane module, and an ultraviolet sterilizer; The inlet end of the pre-filter is connected to the municipal tap water pipe network, the outlet end of the pre-filter is connected to the inlet of the activated carbon filter, the outlet of the activated carbon filter is connected to the inlet of the ultrafiltration membrane module, the outlet of the ultrafiltration membrane module is divided into two paths through a tee. One path is connected to the inlet of the reverse osmosis membrane module through a booster pump, and the other path is connected to the first inlet of the water production mixer through a bypass RO solenoid valve. The outlet of the reverse osmosis membrane module is connected to the second inlet of the water production mixer, and the outlet of the water production mixer is connected to the direct drinking water faucet through the ultraviolet sterilizer.

2. The health direct drinking water system with adjustable water quality of the effluent according to claim 1, wherein A manual ball valve for maintenance is provided on the pipeline connecting the municipal tap water pipe network and the pre-filter, and a pressure switch device is provided to stop the operation of the system when the pressure is lower than the set value.

3. The healthy direct drinking water system with adjustable water quality of the effluent according to claim 1, characterized in that, The pre-filter is provided with a sewage outlet, and a manual flushing and discharge valve is provided at the sewage outlet.

4. The health direct drinking water system with adjustable water quality of the effluent according to claim 1, characterized in that, An inlet solenoid valve is provided on the pipeline between the pre-filter and the activated carbon filter for automatic control of the start and stop of the system; the activated carbon filter includes an activated carbon filter element and a filter housing. The housing is provided with an inlet and an outlet, and all the water entering the activated carbon filter passes through the activated carbon filter element and then converges at the outlet of the activated carbon filter.

5. The healthy direct drinking water system with adjustable water quality of the effluent according to claim 1, characterized in that, The ultrafiltration membrane module includes an ultrafiltration membrane housing and ultrafiltration membrane elements. The ultrafiltration membrane housing is provided with a sewage outlet. The ultrafiltration membrane element uses PVDF hollow fiber membrane filaments. During filtration, all the inlet water passes through the ultrafiltration membrane elements, and the filtration accuracy reaches 20 - 30 nm. A manual valve and a solenoid valve are provided on the sewage outlet of the ultrafiltration membrane module to automatically open the solenoid valve for sewage discharge according to the cumulative working time and pressure loss of the ultrafiltration membrane.

6. The healthy direct drinking water system with adjustable water quality of the effluent according to claim 1, characterized in that, The booster pump is used to boost the water production of the ultrafiltration membrane module to overcome the osmotic pressure of the reverse osmosis membrane. The booster pump uses a small pipeline pump. A pressure switch and an RO inlet solenoid valve are provided on its inlet pipe. The flow rate of the booster pump is selected according to the system flow rate, and the head of the booster pump is determined according to the transmembrane pressure difference of the membrane elements. The operating pressure of the pressurized pipeline is 0.6 - 0.8 MPa. The booster pump has a frequency conversion function and can adjust the pump group frequency according to the pressure behind the pump.

7. The healthy direct drinking water system with adjustable water quality of the effluent according to claim 1, wherein The reverse osmosis membrane module includes a reverse osmosis membrane housing and membrane elements. The membrane elements use ultra-low pressure reverse osmosis membranes; the reverse osmosis membrane module is provided with a waste water outlet, and a waste water ratio flushing solenoid valve group is provided at the waste water outlet to control the ratio of water production to waste water to be maintained at 1 - 2:1; a pressure switch is provided on the pipeline connecting the reverse osmosis membrane module and the water production mixer.

8. The health direct drinking water system with adjustable water quality of the effluent according to claim 1, characterized in that, The water production mixer can achieve that all the liquid from any inlet enters the outlet pipe, or the liquid from both inlets enters the outlet pipe by adjusting the dial; by adjusting the dial, the actual flow cross-sectional areas of the two different inlets are adjusted, so as to realize the flow rate adjustment of the two liquids, and thus adjust the hardness and total salt content of the water production; An electric conductivity water quality monitoring module is provided on the outlet pipeline of the water production mixer to detect the total dissolved solids index of the mixed water production in real time.

9. The health direct drinking water system with adjustable water quality of the effluent, characterized in that, The ultraviolet disinfection device adopts a pipeline type, and the ultraviolet disinfection dose is not less than 40 mJ / cm 2 .

10. The health direct drinking water system with adjustable water quality of the effluent, characterized in that The direct drinking water faucet is provided with an initial sewage discharge solenoid valve and a direct drinking water solenoid valve. After the system starts to produce water each time, the control module automatically opens the initial sewage discharge solenoid valve for 2 to 3 seconds to discharge the initial produced water, and then automatically opens the direct drinking water solenoid valve and closes the initial drainage solenoid valve to ensure the safety of drinking water.

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