Routine Maintenance Method of Laboratory Ultrapure Water Machine

Laboratory ultrapure water machines require regular maintenance and cleaning before use to ensure long-term stable operation. Membrane components in water purifiers are easily damaged if they are used and maintained improperly, so they must be properly cleaned during cleaning. The method operates to extend the life of the device.
First of all, simply recognize the ultra-pure water machine used in the laboratory, pre-treat the tap water through the precision filter element and the activated carbon filter, filter the sediment and other particulate matter and adsorb the odor, etc. to make the tap water cleaner, and then perform the water purification and desalination through the reverse osmosis device. The purified water enters the storage tank and is stored. The water quality can reach the national third-grade water standard, and the wastewater (also called “concentrated water”) produced by the reverse osmosis plant is drained. Reverse osmosis pure water is purified through a purification column for deep desalination to obtain primary or ultrapure water. Finally, if the user has special requirements, ultraviolet sterilizing or microfiltration, ultrafiltration, etc. are added behind the ultrapure water to remove residual water. Bacteria, particles, heat sources, etc.
Precision filter elements, activated carbon filters, reverse osmosis membranes, and purification columns are all materials with relative life. Precision filter elements and activated carbon filter elements actually protect the reverse osmosis membrane. If they fail, the load on the reverse osmosis membrane will increase and the lifespan will decrease. Short, if you continue to turn on the water, then the quality of pure water produced will drop, which will increase the burden on the purification column, and the life of the purification column will be shortened. The end result is increased use of ultrapure water machines.
Therefore, in the use of ultrapure water machines, there are the following aspects that need attention.
1. Precise filter element The precision filter element is also called filter element. It is divided into filter element and PP melt-blown filter element. It mainly filters sediment and other large particles in the raw water. Its filtration accuracy is 5 micron and 1 micron. The new filter element is white. If the surface is long, the surface will silt and sediment, etc. It will appear brown. This means that the filter element cannot be used. After washing the surface sludge with tap water, it can be used 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, and 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. Judging from the empirical statistics, the life of precision filter cartridges is generally from March to June. If there is more sediment in the raw water, the life expectancy is shorter, and there are less particulates such as sediments, so the life expectancy is slightly longer.
2. Activated carbon filter The activated carbon filter mainly removes odors and organic substances from the water through adsorption. There is residual chlorine in tap water, which has a great oxidation effect on the reverse osmosis membrane, so it must be removed via activated carbon. There is no intuitive change in the surface of the activated carbon filter. Based on experience, saturation adsorption is generally achieved in about one year and needs to be replaced.
3. Reverse Osmosis Membrane Reverse osmosis membrane is an extremely important part of the ultrapure water machine. Its pore size is very small. Therefore, microscopic substances such as bacteria are often deposited on the surface during use. Generally, the water purifiers of various manufacturers have anti Flushing function designed to wash away contaminants. For water consumption within 10 liters/day, it can be rinsed 3-5 times. If it exceeds 10 liters, rinse it several times. If it is not used for a long time (such as more than one month), it needs to be taken out and soaked in the disinfecting solution to prevent the growth of bacteria. However, the process is troublesome. It is recommended that even without water, a small amount of water is always turned on to allow the inside of the machine. Water forms a circulation, minimizing the deposition time of stagnant water. The lifespan of reverse osmosis membranes is 2-3 years, which is mainly determined by the amount of water used. Therefore, the matching specifications must be selected during the selection.
4. Purification column Purification column is sometimes called ultra-purification column according to the customer's water quality requirement. The self-action is to perform deep desalination of reverse osmosis pure water, and finally reach the level of first-grade water or ultra-pure water. The principle is ion exchange. The lifetime of the purification column is represented by the resistivity on-line. Below a certain resistance, it means that the purification column is out of date, which is more intuitive. In addition to the anti-water consumption, it is particularly important that the filling amount of the ion-exchange resin and the quality of the ion-exchange resin during the production and design of each manufacturer are important.
5. Ultrapure water machines that use tap water as water source generally have two water outlets, namely, the third-grade water and the first-grade water. The reverse osmosis water is the third-grade water and is stored in the water tank, while the first-grade water It is ready to use, not stored. The tertiary water does not pass through the purification column, and the primary water passes through the purification column. The cost of primary water is higher than that of tertiary water. Therefore, in the daily application, water should be extracted according to water quality requirements. When using the third-grade water, one level of water should not be used as much as possible to avoid the increase in the use cost.

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