The laboratory ultra-pure water machine needs regular maintenance and cleaning before use to ensure its long-term stable operation. If the membrane element in the pure water machine is improperly used and maintained, it is easy to be damaged, so the correct Method to extend the life of the equipment.
First, let ’s briefly understand the ultra-pure water machine used in the laboratory. The tap water is pre-treated with a precision filter element and activated carbon filter element to filter particulate matter such as sediment and adsorbed odors, etc., so that the tap water becomes cleaner. The purified water enters the storage tank for storage, and its water quality can reach the national three-level water standard. At the same time, the wastewater produced by the reverse osmosis device (also known as "concentrated water") is discharged. Reverse osmosis pure water passes through the purification column for deep desalination treatment to obtain first-grade water or ultra-pure water. Finally, if the user has special requirements, ultraviolet sterilization or microfiltration, ultra-filtration and other devices are added after the ultra-pure water to remove residual water Bacteria, particles, heat sources, etc.
The 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 actually protect the reverse osmosis membrane. If they fail, the load of the reverse osmosis membrane will increase and the life will be reduced. Short, if you continue to start, the quality of the pure water produced will decline, which will increase the burden on the purification column, and the life of the purification column will be shortened. The end result is to increase the use cost of ultrapure water machine.
Therefore, in the use of ultra-pure water machine, there are the following things need to pay attention to.
1. Precision filter
Precision filter element is also called filter element. It is divided into wire wound filter element and PP melt-blown filter element. It mainly filters large particles such as sediment in raw water. The new filter element is white. If the surface is silted up for a long time, it will be brown. . The filter element is placed inside the filter bottle. Some filter bottles are transparent, and you can visually observe the color change of the filter element. Some filter bottles are opaque, and you need to unscrew them to observe the change of the filter element. From the empirical data statistics, the life of the precision filter element is generally from March to June. If there is more sediment in the raw water, the life will be shorter, and if the sediment is less, the life will be slightly longer.
2. Activated carbon filter
Activated carbon filter element mainly removes odor and organic matter in 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 through activated carbon. There is no intuitive change in the surface of the activated carbon filter. According to experience, it usually reaches saturation adsorption in about one year and needs to be replaced.
3. Reverse osmosis membrane
Reverse osmosis membrane is a very important part in ultrapure water machine. Its pore size is very small, so in the process of use, bacteria and other microscopic substances are often deposited on its surface. Generally, pure water machines of various manufacturers have a backwashing function, designed to Wash off contaminants. If the water consumption is within 10 liters / day, it can be washed 3-5 times, and if it exceeds 10 liters, it should be washed several times. If you do not use it for a long time (such as more than 1 month), you need to take it out and soak it in the disinfectant to avoid the growth of bacteria, but the process is more troublesome. It is recommended to use a small amount of water to turn on the machine even if it is not used Water forms a circulation and minimizes the settling time of dead water. The life of the reverse osmosis membrane is 2-3 years, which is mainly determined by the amount of water used, so be sure to choose the matching specifications when choosing.
4. Purification column
Purification columns are sometimes called ultra-purification columns according to customers' water quality requirements. 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 life of the purification column is represented by the resistivity online. Below a certain resistance means that the purification column has expired, which is more intuitive. In addition to its water resistance, its life is particularly important for the filling amount of ion exchange resins and the quality of the ion exchange resins in the design and design of various manufacturers.
5. Water
The ultrapure water machine with tap water as the water source generally has two outlets, which are tertiary water and primary water. The water after reverse osmosis is tertiary water, which is stored in the water tank, and the primary water is ready to use Take it immediately, do not store it. 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 daily application, water should be taken separately according to water quality requirements. If you can use tertiary water, try not to use primary water as much as possible to avoid rising use costs.
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