Pure water and pure water are not the same thing at all.
From an academic point of view, pure water, also known as high purity water, refers to water of extremely high chemical purity. Its primary use is in the areas of biology, chemical industry, metallurgy, aerospace, and electric power, but its demand for water quality purity is quite high, so it is usually used the most. It is still the electronics industry. For example, the pure water used in power systems requires low impurity levels to reach the microgram/liter level.
In the production process of high-purity water, the anions and cations in the water can be removed by electrodialysis, reverse osmosis and ion exchange resins, etc. The particles in the water can usually be removed by ultrafiltration, membrane filtration, etc. Drug or UV light irradiation or ozone sterilization method to remove; TOC in water is usually treated with activated carbon, reverse osmosis.
The dissolved gases in natural water include oxygen, carbon dioxide, sulfur dioxide, and a few methane, helium, etc. These gases must also be removed during the production of high-purity water. In order to effectively remove impurities, some chemical sterilizing agents such as formaldehyde, hydrogen peroxide, and sodium hypochlorite were added during the production of high-purity water. Therefore, these constitute one of the reasons why high-purity water cannot be used as drinking water.
So what is pure water?
The so-called pure water refers to the water does not contain any harmful substances and bacteria, such as organic pollutants, inorganic salts, any additives and various impurities, to avoid all kinds of bacteria invasion of the human body, its strength is to be able to safely make up for the body's water, with Very strong solubility, and therefore strong affinity with human cells. It is the use of ion exchange, reverse osmosis, microfiltration and other appropriate physical processing methods for deep treatment of water.
Normally, only 50%-75% of the source water is used in the production process of pure water. In other words, 1 kg of tap water or groundwater can only produce about 0.4 kg of pure water, and the remaining 0.6 kg of water Water cannot be used as drinking water and it can only be used for other purposes.
A sample of water is safe and clean. It must first be based on water quality, and the quality of water is determined primarily by the purity of the water. The purity of water refers to the content of impurities in the water.
Of course, raw water quality plays a very important role. The current open bodies of rivers and lakes are the most commonly used water sources for industrial and livelihood water, but their water quality is related to the geographical conditions, climate, biological activities, and human activities in the areas they flow through. Such as some biological impurities: aquatic organisms (such as algae) and bacteria, microbes, etc.; organic substances: natural organic compounds (such as humic acid), industrial and livelihood wastes. It is reported that there are currently 2,221 organic species known to be in water, and some of them are carcinogenic.
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