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Purified water equipment is used to meet the needs of various industries to prepare purified water.
It is mostly used in pharmaceuticals, medical devices, cosmetics, food, health care products and other industries.
Three parts of the distribution system are constructed
.
1.
Pretreatment system: raw water tank, raw water pump, multi-media filter, softener, activated carbon filter, plate heat exchanger, security filter The tap water reaches the raw water tank through the water inlet pipe and enters the purified water equipment to open the water treatment trip.
The raw water tank plays a role of storage.
Even when the tap water is cut off instantly, the water inlet pressure and water volume of the system can be kept stable
.
At the same time, the raw water tank is also equipped with a cleaning spray ball to prevent chlorine corrosion on the head of the tank, and a respirator is installed to prevent foreign objects such as insects from entering the raw water tank
.
The water in the raw water tank relies on the power provided by the raw water pump to meet the pressure and flow requirements of the raw water before reaching the RO unit through the pretreatment unit
.
Before reaching the RO unit, the raw water will be processed by the multi-media filter, softener and activated carbon filter of the pretreatment unit to remove insoluble impurities, soluble impurities, organic matter and microorganisms in the raw water, so that the main water quality parameters can reach the subsequent purification system.
water intake requirements
.
The multi-media filter uses natural quartz sand with different particle sizes to form 3~5 filter layers to filter out fine particles, suspended solids, colloids and other impurities in the raw water
.
The SDI value of the produced water is less than or equal to 5
.
The softener passes the raw water through the sodium-type cation exchange resin, reduces the hardness of the raw water, prevents scaling on the surface of the reverse osmosis membrane, and affects the performance of the reverse osmosis membrane
.
Double softening runs in series, with alternate regeneration
.
Product water hardness ≤ 3mg/L
.
The activated carbon filter adsorbs organic matter, oxidants, pigments and odors in the raw water, and protects the RO membrane from being oxidized
.
The residual chlorine value of the produced water is less than or equal to 0.
05mg/L
.
In the pretreatment unit, under normal circumstances, when the raw water is pretreated, it will be heated and sterilized by a plate heat exchanger at the front end of the system, and the temperature of the circulating raw water will be raised to 80 °C for pasteurization, which effectively prevents the growth of microorganisms in the pretreatment system
.
After the raw water passes through the multi-media filter, softener and activated carbon filter, it will flow to the security filter for reprocessing
.
The security filter is usually installed after the pretreatment system of the purified water system and before the high pressure pump of the RO system
.
The security filter is a mechanical filtration device.
Large-sized impurities in the water cannot pass through the PP filter element with a pore size of 5 μm, and are trapped on the surface of the filter element
.
The security filter is one of the components in the purified water system, which has the function of purification and protection, which is equivalent to adding a "safety line of defense" to the water system
.
In the process of use, attention should also be paid to replacing the filter element in time to ensure that the water produced by the system is more stable and reliable
.
2.
Preparation system: High-pressure pump, RO, EDI purified water system can obtain stable and qualified water quality.
One of its key technologies is RO technology
.
The pretreated water obtained after the raw water is pretreated must pass through a high-pressure pump before entering the RO system
.
In the RO device, the RO membrane element has a selective permeation effect on the ions in the water, and there is a pressure difference between the concentrated water side and the fresh water side.
The external pressure must be used to overcome the osmotic pressure difference, so that the RO device can operate normally and meet the system design requirements.
.
Therefore, the function of the high-pressure pump is to provide the power required for reverse osmosis, which is helpful for the separation of solvent and solute, and is the guarantee for the stable and reliable operation of the RO device
.
The first-stage RO high-pressure pump and the second-stage RO high-pressure pump use high-efficiency centrifugal water pumps.
The pump body overflow material is generally 304 stainless steel, and the pump outlet adopts high-pressure protection
.
The high-pressure pump adopts frequency conversion control, which has the characteristics of strong power, stable transmission and constant pressure water supply, which provides support for the stable water output of the subsequent RO system
.
If the water supply pressure of the purified water equipment is too low, you can check the pressure at the inlet of the high-pressure pump, check whether there is water leakage or air leakage in the pump body, check whether the filter element of the precision filter is fouled, etc.
, check one by one, and improve it in time to ensure purified water.
The system is operating normally
.
In general, by carefully selecting high-pressure pumps with good performance, the water quality of purified water equipment will be more stable and reliable, and at the same time, it will help prolong the service life of the equipment
.
The reverse osmosis system is referred to as RO.
Its working principle is that when the mixture of molecules of different particle sizes passes through the semi-permeable membrane, driven by the pressure, the solute and the solution are separated due to the selective permeability of the semi-permeable membrane
.
In terms of process selection, the purified water equipment adopts the RO process and is used in conjunction with the pretreatment device.
The water quality of the produced water is stable and reliable, and it has shown good results in water production projects in the pharmaceutical and other industries
.
If the user has higher requirements on the conductivity of the produced water, an EDI device can be installed after the reverse osmosis device to achieve deep desalination and further improve the level of water in the production process
.
EDI is the abbreviation of Electrodeionization Device.
In the pharmaceutical industry, the purified water equipment is equipped with a reasonable pretreatment system and purification system to prepare more "pure" purified water, so as to meet the water demand in the production process
.
In the system design, the EDI device is usually installed after the reverse osmosis system to perform secondary desalination on the RO permeate water
.
EDI technology utilizes a new separation technology combining electrodialysis and ion exchange desalination technology, which can effectively remove trace ions in the product water, and the conductivity of the product water can be less than 0.
07μS/cm
.
Figure 1 Jingderui purified water equipment 3.
Distribution system: purified water tank, purified water delivery pump, ultraviolet sterilizer, ozone sterilizer, double tube sheet heat exchanger The water treated by RO and EDI flows from the pipeline to the purified water tank , The purified water tank has the function of storage, providing a constant pressure environment to ensure the stable water supply of the system
.
In storage and distribution systems, storage tanks require effective measures to inhibit the growth of microorganisms, prevent the formation of difficult-to-remove biofilms in the system, and reduce corrosion to equipment.
At the same time, storage tanks need to be sealed, and the inner and outer surfaces should be smooth to facilitate the use of chemical Clean and sanitize storage tanks
.
The water in the purified water tank is output through the purified water delivery pump, which is controlled by the frequency conversion constant current, and the return water flow rate is controlled at 1~1.
5m/s to prevent the growth of microorganisms
.
The high liquid level in the purified water tank automatically turns on the water supply pump, and the low liquid level closes the water supply pump for shutdown protection
.
In order to ensure the water quality in the entire distribution system, ultraviolet sterilizers, ozone sterilizers and double tube sheet heat exchangers will be selected
.
UV light affects the growth of biofilms by slowing the growth of new colonies in the water system, but this is only partially effective on planktonic microorganisms and does not eliminate biofilms that have already formed
.
Ultraviolet light alone is not an effective disinfection method.
It usually needs to be used in combination with conventional hot water or chemical disinfection methods to improve the sterilization effect and prolong the disinfection interval
.
Ultraviolet sterilizers are usually installed in the purified water storage and distribution pipe network loop, and are used in combination with disinfection methods such as pasteurization to prevent excessive growth of microbial indicators in the system
.
Ozone sterilizers are generally used in purified water storage and distribution systems, and ozone disinfection is carried out on a regular basis to effectively control microorganisms within the scope of internal control standards
.
Ozone can effectively control microorganisms.
It is a strong oxidant, which chemically reacts with organisms and kills microorganisms.
The ozone concentration at the ozone disinfection point of the distribution system is greater than 0.
2mg/L, which can effectively remove the microbial film
.
The distribution system adopts a double-plate tube structure to prevent cross-contamination
.
The purified water passes through the tube side of the double tube sheet heat exchanger, and the steam passes through the shell side of the double tube sheet heat exchanger.
The temperature of the circulating purified water is raised to 80 °C for pasteurization, and the circulating temperature is kept for 1 hour to effectively kill the heat-labile.
All microorganisms
.
Learning about the process of the above purified water equipment system can quickly help us understand the purified water equipment, so as to provide a reference for better selection and use
.
It is mostly used in pharmaceuticals, medical devices, cosmetics, food, health care products and other industries.
Three parts of the distribution system are constructed
.
1.
Pretreatment system: raw water tank, raw water pump, multi-media filter, softener, activated carbon filter, plate heat exchanger, security filter The tap water reaches the raw water tank through the water inlet pipe and enters the purified water equipment to open the water treatment trip.
The raw water tank plays a role of storage.
Even when the tap water is cut off instantly, the water inlet pressure and water volume of the system can be kept stable
.
At the same time, the raw water tank is also equipped with a cleaning spray ball to prevent chlorine corrosion on the head of the tank, and a respirator is installed to prevent foreign objects such as insects from entering the raw water tank
.
The water in the raw water tank relies on the power provided by the raw water pump to meet the pressure and flow requirements of the raw water before reaching the RO unit through the pretreatment unit
.
Before reaching the RO unit, the raw water will be processed by the multi-media filter, softener and activated carbon filter of the pretreatment unit to remove insoluble impurities, soluble impurities, organic matter and microorganisms in the raw water, so that the main water quality parameters can reach the subsequent purification system.
water intake requirements
.
The multi-media filter uses natural quartz sand with different particle sizes to form 3~5 filter layers to filter out fine particles, suspended solids, colloids and other impurities in the raw water
.
The SDI value of the produced water is less than or equal to 5
.
The softener passes the raw water through the sodium-type cation exchange resin, reduces the hardness of the raw water, prevents scaling on the surface of the reverse osmosis membrane, and affects the performance of the reverse osmosis membrane
.
Double softening runs in series, with alternate regeneration
.
Product water hardness ≤ 3mg/L
.
The activated carbon filter adsorbs organic matter, oxidants, pigments and odors in the raw water, and protects the RO membrane from being oxidized
.
The residual chlorine value of the produced water is less than or equal to 0.
05mg/L
.
In the pretreatment unit, under normal circumstances, when the raw water is pretreated, it will be heated and sterilized by a plate heat exchanger at the front end of the system, and the temperature of the circulating raw water will be raised to 80 °C for pasteurization, which effectively prevents the growth of microorganisms in the pretreatment system
.
After the raw water passes through the multi-media filter, softener and activated carbon filter, it will flow to the security filter for reprocessing
.
The security filter is usually installed after the pretreatment system of the purified water system and before the high pressure pump of the RO system
.
The security filter is a mechanical filtration device.
Large-sized impurities in the water cannot pass through the PP filter element with a pore size of 5 μm, and are trapped on the surface of the filter element
.
The security filter is one of the components in the purified water system, which has the function of purification and protection, which is equivalent to adding a "safety line of defense" to the water system
.
In the process of use, attention should also be paid to replacing the filter element in time to ensure that the water produced by the system is more stable and reliable
.
2.
Preparation system: High-pressure pump, RO, EDI purified water system can obtain stable and qualified water quality.
One of its key technologies is RO technology
.
The pretreated water obtained after the raw water is pretreated must pass through a high-pressure pump before entering the RO system
.
In the RO device, the RO membrane element has a selective permeation effect on the ions in the water, and there is a pressure difference between the concentrated water side and the fresh water side.
The external pressure must be used to overcome the osmotic pressure difference, so that the RO device can operate normally and meet the system design requirements.
.
Therefore, the function of the high-pressure pump is to provide the power required for reverse osmosis, which is helpful for the separation of solvent and solute, and is the guarantee for the stable and reliable operation of the RO device
.
The first-stage RO high-pressure pump and the second-stage RO high-pressure pump use high-efficiency centrifugal water pumps.
The pump body overflow material is generally 304 stainless steel, and the pump outlet adopts high-pressure protection
.
The high-pressure pump adopts frequency conversion control, which has the characteristics of strong power, stable transmission and constant pressure water supply, which provides support for the stable water output of the subsequent RO system
.
If the water supply pressure of the purified water equipment is too low, you can check the pressure at the inlet of the high-pressure pump, check whether there is water leakage or air leakage in the pump body, check whether the filter element of the precision filter is fouled, etc.
, check one by one, and improve it in time to ensure purified water.
The system is operating normally
.
In general, by carefully selecting high-pressure pumps with good performance, the water quality of purified water equipment will be more stable and reliable, and at the same time, it will help prolong the service life of the equipment
.
The reverse osmosis system is referred to as RO.
Its working principle is that when the mixture of molecules of different particle sizes passes through the semi-permeable membrane, driven by the pressure, the solute and the solution are separated due to the selective permeability of the semi-permeable membrane
.
In terms of process selection, the purified water equipment adopts the RO process and is used in conjunction with the pretreatment device.
The water quality of the produced water is stable and reliable, and it has shown good results in water production projects in the pharmaceutical and other industries
.
If the user has higher requirements on the conductivity of the produced water, an EDI device can be installed after the reverse osmosis device to achieve deep desalination and further improve the level of water in the production process
.
EDI is the abbreviation of Electrodeionization Device.
In the pharmaceutical industry, the purified water equipment is equipped with a reasonable pretreatment system and purification system to prepare more "pure" purified water, so as to meet the water demand in the production process
.
In the system design, the EDI device is usually installed after the reverse osmosis system to perform secondary desalination on the RO permeate water
.
EDI technology utilizes a new separation technology combining electrodialysis and ion exchange desalination technology, which can effectively remove trace ions in the product water, and the conductivity of the product water can be less than 0.
07μS/cm
.
Figure 1 Jingderui purified water equipment 3.
Distribution system: purified water tank, purified water delivery pump, ultraviolet sterilizer, ozone sterilizer, double tube sheet heat exchanger The water treated by RO and EDI flows from the pipeline to the purified water tank , The purified water tank has the function of storage, providing a constant pressure environment to ensure the stable water supply of the system
.
In storage and distribution systems, storage tanks require effective measures to inhibit the growth of microorganisms, prevent the formation of difficult-to-remove biofilms in the system, and reduce corrosion to equipment.
At the same time, storage tanks need to be sealed, and the inner and outer surfaces should be smooth to facilitate the use of chemical Clean and sanitize storage tanks
.
The water in the purified water tank is output through the purified water delivery pump, which is controlled by the frequency conversion constant current, and the return water flow rate is controlled at 1~1.
5m/s to prevent the growth of microorganisms
.
The high liquid level in the purified water tank automatically turns on the water supply pump, and the low liquid level closes the water supply pump for shutdown protection
.
In order to ensure the water quality in the entire distribution system, ultraviolet sterilizers, ozone sterilizers and double tube sheet heat exchangers will be selected
.
UV light affects the growth of biofilms by slowing the growth of new colonies in the water system, but this is only partially effective on planktonic microorganisms and does not eliminate biofilms that have already formed
.
Ultraviolet light alone is not an effective disinfection method.
It usually needs to be used in combination with conventional hot water or chemical disinfection methods to improve the sterilization effect and prolong the disinfection interval
.
Ultraviolet sterilizers are usually installed in the purified water storage and distribution pipe network loop, and are used in combination with disinfection methods such as pasteurization to prevent excessive growth of microbial indicators in the system
.
Ozone sterilizers are generally used in purified water storage and distribution systems, and ozone disinfection is carried out on a regular basis to effectively control microorganisms within the scope of internal control standards
.
Ozone can effectively control microorganisms.
It is a strong oxidant, which chemically reacts with organisms and kills microorganisms.
The ozone concentration at the ozone disinfection point of the distribution system is greater than 0.
2mg/L, which can effectively remove the microbial film
.
The distribution system adopts a double-plate tube structure to prevent cross-contamination
.
The purified water passes through the tube side of the double tube sheet heat exchanger, and the steam passes through the shell side of the double tube sheet heat exchanger.
The temperature of the circulating purified water is raised to 80 °C for pasteurization, and the circulating temperature is kept for 1 hour to effectively kill the heat-labile.
All microorganisms
.
Learning about the process of the above purified water equipment system can quickly help us understand the purified water equipment, so as to provide a reference for better selection and use
.
