Analyze the process configuration of ultra-pure water machine and purchase of products
The ultra-pure water machine adopts pretreatment, reverse osmosis technology, ultra-purification treatment and post-stage treatment to remove the conductive medium in the water almost completely, and removes the colloidal substances, gases and organic substances that are not dissociated in the water to a very low level. Degree of water treatment equipment. Ultra-pure water machine is also known as: ultra-pure water, ultra-pure water equipment, ultra-pure water meter, ultra-pure water system, laboratory ultra-pure water, etc. The ultrapure water produced by the ultrapure water machine should generally have a resistivity of more than 10 megohms, and water above 10 megohms is called ultrapure water. High-quality ultra-pure water can reach 18.2 megohms.
product description
Laboratory ultrapure water machine
The laboratory ultra-pure water machine is roughly divided into four units: pretreatment, reverse osmosis, ultra-purification, and terminal ultrafiltration. The tap water first passes through the pretreatment unit to remove larger particles, suspended solids and some organic matter in the water. Then enter the reverse osmosis unit to remove the ionic substances and macromolecular substances (such as viruses, microorganisms, etc.) in the water. After purification and ultra-purification, the micro-ion remaining after membrane removal is purified and ultra-purified to reduce the ion content in the water to trace levels. Finally, through UV, ultrafiltration and other technologies to ensure that micro-organisms, organic matter and pyrogens in ultra-pure water meet the needs of various experimental applications.
Technical principle
The ion exchange of an ultrapure water machine is a special solid adsorption process which is carried out in an electrolyte solution of an ion exchanger. A typical ion exchanger is a solid particulate material that is insoluble in water, i.e., an ion exchange resin. It can extract a certain cation or anion from the electrolyte solution, and exchanges another ion with the same charge symbol contained in its own equivalent amount and releases it into the solution. This is called ion exchange. Depending on the type of ion exchanged, the ion exchanger can be divided into two major categories: cation exchangers and anion exchangers.
Process configuration
1. Pretreatment system → reverse osmosis system → intermediate water tank → coarse mixed bed → fine mixed bed → pure water tank → pure water pump → ultraviolet sterilizer → polishing mixed bed → precision filter → water object (≥18MΩ.CM) (traditional Process)
2. Pretreatment→Reverse Osmosis→Intermediate Water Tank→Water Pump→EDI Device→Purification Water Tank→Pure Water Pump→UV Sterilizer→Polishing Mixed Bed→0.2 or 0.5μm Precision Filter→Water Object (≥18MΩ.CM) (Latest Process)
3. Pretreatment → first-stage reverse osmosis → dosing machine (pH adjustment) → intermediate water tank → second-stage reverse osmosis (positive charge reverse osmosis membrane) → pure water tank → pure water pump → EDI device → ultraviolet sterilizer → 0.2 or 0.5μm precision filter → water object (≥17MΩ.CM) (latest process)
4. Pretreatment→Reverse Osmosis→Intermediate Water Tank→Water Pump→EDI Device→Pure Water Tank→Pure Water Pump→UV Sterilizer→0.2 or 0.5μm Precision Filter→Water Object (≥15MΩ.CM) (Latest Process)
5. Pretreatment system → reverse osmosis system → intermediate water tank → pure water pump → coarse mixed bed → fine mixed bed → ultraviolet sterilizer → precision filter → water object (≥15MΩ.CM) (traditional process)
product keeper
First of all, simply understand the laboratory ultra-pure water machine, the tap water is pre-treated through the precision filter element and the activated carbon filter element, filtering the sediment and other particulate matter and adsorbing the odor, so that the tap water becomes cleaner, and then the water is purified and desalted by the reverse osmosis device. The purified water is stored in the storage tank, and the water quality can reach the national three-level water standard, and the wastewater produced by the reverse osmosis device (also called "concentrated water") is discharged. The reverse osmosis pure water is subjected to deep desalting treatment through the purification column to obtain first-grade water or ultra-pure water. Finally, if the user has special requirements, ultraviolet sterilizing or microfiltration, ultrafiltration and the like are added after the ultrapure water to remove residual water. Bacteria, particles, heat sources, etc.
Precision filter element, activated carbon filter element, reverse osmosis membrane and purification column are all materials with relative life. The precision filter element and activated carbon filter element are actually the protection of reverse osmosis membrane. If they fail, the load of reverse osmosis membrane will be aggravated and the service life will be reduced. If the water is turned on, the quality of the pure water produced will decrease, which will increase the burden on the purification column, and the life of the purification column will be shortened. The end result is an increase in the cost of using ultrapure water machines. Therefore, in the use of laboratory ultra-pure water machines, there are the following aspects that need attention.
Precision filter
The precision filter element, also known as the filter filter element, the split-line wound filter element and the PP melt-blown filter element, mainly filters large particles such as sediment in the raw water, and the filtration precision is 5 micrometers and 1 micrometer. The new filter element is white. If the surface is long, the surface will be silted, etc., and it will appear brown. This means that the filter element can not be used. After washing the surface sludge with tap water, it can barely continue to use for 1-2 weeks, but it cannot be used for a long time. . The filter element is placed inside the filter bottle. Some filter bottles are transparent. The color change of the filter element can be visually observed. Some filter bottles are opaque and need to be unscrewed to observe the change of the filter element. From the empirical data statistics, the life of the precision filter is generally from March to June. If there is more sediment in the raw water, the life is shorter, and there are fewer particles such as sediment, and the life is slightly longer.
Activated carbon filter
The activated carbon filter is made of high-quality shell carbon and coal-based activated carbon, supplemented by food-grade binders. It is processed by special technology using high-tech technology. It integrates adsorption, filtration, interception and catalysis. Effectively remove organic matter, residual chlorine and other radioactive substances in water, and have the effect of discoloration and odor removal. It is an ideal new generation product in the liquid and air purification industry. Type: white head sintered activated carbon filter, black head with skeleton, sintered activated carbon filter, granular activated carbon filter. The activated carbon filter has no intuitive change from the surface. According to experience, it generally reaches saturation adsorption in about one year and needs to be replaced.
Product purchase
We do experiments every day, and the most exposed reagents are water, which usually runs through our entire experimental process. Perhaps because of the universality and availability of water, we often overlook the impact it has on experimental results. Therefore, the correct choice of a laboratory ultra-pure water machine can help researchers avoid many unnecessary troubles. However, there are many brands of ultra-pure water machines in the domestic market, the quality is uneven, and the price disparity is huge. This has caused great confusion to the purchasers who are interested in using ultra-pure water machines. I don’t know which brand to choose, the following combination The actual work experience to talk about how to choose an ultra-pure water machine that suits you. Before we talk about how to choose ultra-pure water machine, we first understand the difference between pure water and ultra-pure water and the current domestic laboratory ultra-pure water machine. Market conditions.
Folding pure water difference
Before choosing the right laboratory ultrapure water machine, we must have a good understanding of the following concepts: What is pure water? What is ultrapure water? What is the difference between the two?
Pure water, also known as pure water, refers to the seal made by the electrodialyzer method, the ion exchanger method, the reverse osmosis method, the distillation method and other appropriate processing methods, using water that meets the sanitary standard of drinking water as the raw water. In the container, without any additives, colorless and transparent, water that can be directly consumed. The space water and distilled water sold on the market are pure water.
Ultrapure water removes the conductive medium in the water almost completely on the basis of pure water, and removes the colloidal substances, gases and organic substances that are not dissociated in the water to a very low level of water. The resistivity is greater than 18 MΩ*cm, or close to the 18.25 MΩ*cm limit. Ultrapure water is difficult to achieve in general process. Two or more technologies of microfiltration technology, ultrafiltration technology, reverse osmosis technology, EDI technology and ion exchange technology can be designed through reasonable process and equipment selection. In order to produce ultrapure water, the resistivity can reach 18.20MΩ*cm.
The difference between pure water and ultrapure water exists in many aspects. Here are just a few of them, which are summarized as follows:
A, the conductivity is different, the conductivity of pure water is between 2-10us/cm, and the conductivity of ultrapure water is 0.056us/cm;
B. The degree of difficulty in manufacturing is different. The pure water used in the market is basically obtained by reverse osmosis, distillation, etc., and the ultrapure water is subjected to photo-oxidation technology, fine treatment and on the basis of pure water. A series of complicated purification techniques such as polishing treatment.
C, heavy metals, bacteria, particles and other indicators are also very different, pure water impurity content is ppm level, and ultra-pure water is ppb level, simply said that there is no impurity in ultra-pure water, close to the theoretical water.
D, the field of use is also different;
E. The requirements for the material of the conveying pipe are also different. The ultra-pure water requires stricter material for the conveying pipe than the pure water.
The ultrapure water equipment is a preparation device for pure water for laboratory inspection and quarantine. The laboratory ultra-pure water machine is suitable for laboratories of testing centers, research institutes, universities, hospitals and enterprises to provide the required analytical test water, reagent water, laboratory water and analytical instrument water. In inorganic and analytical chemistry experiments, depending on the task and requirements, the purity requirements for water are also different. Pure water is "pure water" and "ultra-pure water".
People generally confuse these two concepts in the process of purchasing ultrapure water equipment, which makes it difficult to select and increase the cost of material supply for no reason. Pay attention to the following points when purchasing ultrapure water equipment:
1. When purchasing ultra-pure water equipment, it is best to choose the type of water according to the nature of your enterprise and the purpose of the experiment, in order to purchase the model according to the previous sales experience;
2, the purchase of ultra-pure water equipment models reference indicators should follow the "high or low" principle;
3, the amount of water is generally calculated according to 8 hours a day, if the ultra-pure water equipment on the model water output is 15L / hour, then its daily water output should be 120L;
Ultra pure water machine brand
At present, the domestic ultra-pure water machine market has changed from a situation in the past to a "one big, one hundred schools of thought", domestic ultra-pure water machine manufacturers have made great progress, but the overall technical level is relatively low, truly capable There are still relatively few manufacturers of ultra-pure water. Many manufacturers regard pure water with a resistivity of 18.2 MΩ·cm as ultrapure water. In fact, this is a misunderstanding because many organic molecules, bacteria and particles do not exist in ionic form, so they will not be affected. When the resistivity is measured, the result is that when the resistivity reading is good, there may still be contamination of organic matter, bacteria, etc. in the water. Such water cannot be called ultrapure water, and true ultrapure water contains almost no impurities. Nowadays, the domestic ultra-pure water machine market is gradually prospering, and a large number of manufacturers are working hard to improve the technical level and open up a new world.
Application field
1, electronics, electricity, electroplating, lighting appliances, laboratories, food, paper, daily chemicals, building materials, paint, batteries, laboratory, biological, pharmaceutical, petroleum, chemical, steel, glass and other fields.
2. Pure water for chemical process water, chemical agents, cosmetics, etc.
3, single crystal silicon, semiconductor wafer cutting manufacturing, semiconductor chips, semiconductor packaging, lead frame, integrated circuits, liquid crystal displays, conductive glass, picture tubes, circuit boards, optical communications, computer components, capacitors clean products and various components, etc. The production process uses pure water.
4, pure water equipment, reverse osmosis equipment, boiler softened water equipment, industrial softened water equipment, food industry softened water equipment, household water softener
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