In 1878 Robert Barnstead developed the first all-metal laboratory water distiller. The distilled pure water was taken by physical heating of the raw water for basic experiments in the laboratory.
The resistivity index of a single distilled water is usually 0.2 megabytes, and after re-distillation, it can reach more than 1 megabyte. These are the empirical values ​​obtained under the premise that the raw water conditions are stable and the water quality can meet the municipal tap water standard, and the manufacturer of the distilled water will not promise this index.
Because of the high temperature treatment, the heat source index of distilled water is better, but the negative factor is the influence of heating on the laboratory environment. Quartz distilled water generally has a power of 1-5KW, while stainless steel distilled water has a power of more than 10KW. This way of obtaining pure water is extremely energy-intensive.
In addition, if the water supply is insufficient during the distillation process, the distilled water device may also have a safety hazard of explosion and fire.
Customers usually prepare distilled water and store it in the bucket. However, there is basically no customer to disinfect the container in stages. The stored pure water is easily contaminated by secondary pollution. For pure water that does not flow for a long time, the TOC index will become more and more. high. Distilled water removes most of the contaminants in tap water, but volatile impurities cannot be removed, such as carbon dioxide, ammonia, and some organic matter.
Distilled water used to be the most commonly used pure water in the laboratory. The equipment is low in price, but it is extremely energy-intensive, water-consuming and electricity-consuming, slow in water production, low in water quality, unstable in water quality, etc., and cannot meet the water demand for scientific research experiments. At the same time, there are still hidden dangers of water shortage and explosion, and the application is gradually decreasing.
With the gradual maturity of RO technology, pure water machine has gradually replaced the traditional distiller. Taking the SPRING primary/intermediate water purifier produced by Xiamen Ruisijie Purification Technology Co., Ltd. as an example, the water production index of the two-stage RO can be stabilized. >0.2 trillion, which is superior to the national laboratory three-level water standard, which is basically consistent with the resistivity index of one distilled water, but the stability can be guaranteed.
In addition, the power of this series of equipment is only 50-100W, and the recovery rate is generally between 25-35%. Compared with the power of several kilowatts of distilled water, the operating cost is greatly reduced.
As a laboratory equipment, its own water shortage protection, power failure protection, water quality monitoring and other functions ensure safety performance. In addition, the fully enclosed pressure storage bucket as a storage container also solves the problem of secondary pollution of pure water.
The quantitative water intake function with an accuracy of less than 2% embodies the humanized design, which can be directly connected with equipments such as ultrapure water system, biochemical analyzer, washing machine and other primary pure water. On the one hand, it is convenient for users to use. Prevent the occurrence of secondary pollution.
For areas where raw water particles are contaminated and hardness is seriously polluted, a turbidity removal device or a softening device can be placed in front of the water inlet of the equipment, which greatly enhances the adaptability of raw water.
For customers with higher water quality requirements, DI can be built with upgradeable water quality, which expands the application range of the equipment.
In summary, the pure water system has higher water quality stability, higher resistivity requirements, water/electric energy consumption, safety, humanization, and ease of use, far exceeding the traditional distilled water, RO process or pure water of RO+DI ​​process. Equipment is gradually replacing the distiller, and will definitely replace the distiller completely, becoming the first choice to meet the laboratory's primary pure water needs.
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