Ozone (03) was gradually recognized after 1840. Ozone is composed of three oxygen atoms, but it has a high oxidation-reduction potential, so it has a very strong oxidizing ability, can degrade a variety of impurities in water and kill a variety of pathogenic bacteria, molds, viruses and kill Such as shellfish mollusk larvae (up to 98%) and aquatic organisms such as sword daphnia, oligochaetes, daphnia rotifers, etc., so as early as 1886 in France conducted an ozone sterilization test. In 1893, a 3 m³ / h water purification plant in the Netherlands was put into operation. The ozone treatment water plant built in Nice in France in 1906 was in operation until 1970. Nice water plant is regarded as "the birthplace of ozonation of drinking water". In 1908, a German Siemens ozone generator was installed in Fuzhou Water Plant. Up to now, there are thousands of ozone treatment water plants in the world. In 1980, Montreal, Canada built a large water plant with a daily water supply of 2.3 million tons and ozone consumption of 300 kg / h. Most of them are built in developed countries and developing countries. Only a small number of small-scale applications. Since the 1980s, a small number of water plants in China have adopted the ozone method, such as Beijing Tiancun Water Plant (15kg03 / h), Kunming Water Plant (33kg03 / h), and some industrial and mining enterprises internal water plants, such as Daqing Oilfield and Shengli Oilfield. The water plants of Yanshan Petrochemical and other units also have ozone equipment in operation. Compared with foreign scales, China can only say that it is still in its infancy.
The reason why ozone water treatment has developed greatly in the world is not only because of its effective ability to remove impurities and sterilization, but also because it does not produce secondary pollution (residual toxicity) in water after treatment, and excess ozone will also decompose faster It is oxygen-like and does not resemble chlorine. It forms carcinogens such as chloramine and chloroform in water, and is recognized as the safest disinfectant in the world. There is no large-scale promotion in developing countries, the reason is that the ozone treatment fixed asset input is too high and the operating power consumption is too high. In countries with insufficient funds, since the mid-1980s, many bottled water plants in China have high water quality standards, Bottled water is also highly economical, and the use of the ozone method allows small-scale ozone generators to be promoted on a larger scale. Most bottled water plants that correctly apply ozone-treated water can reach the international standard of double zero (E. coli, total bacteria are zero). 1. Several basic factors that affect the sterilization effect of ozone water treatment Because ozone water treatment is a new thing, people are still not very familiar with it. Some manufacturers, construction units, and ozone users mistakenly believe that as long as the button is pressed, ozone gas is blown into the water, and disinfection is completed. This misunderstanding makes the application of ozone not as expected, and even causes some people to doubt the sterilization ability of ozone itself.
Some manufacturers use a very simple ozone generator to treat bottled water, and they know nothing about the ozone concentration and the water-soluble ozone concentration after treatment. The actual effect of sterilization is unbelievable. Difficult to apply. The author also interviewed a mineral water plant with a water volume of 5 tons per hour. The design unit selected an ozone generator of 100g03 / h. The residence time of the water in the contact absorption device is only a few seconds, and the treated water is unqualified. And a large amount of ozone tail gas overflowed in the filling room, and the workers could not work.
There are also household water processors produced by some manufacturers, regardless of their oxygen concentration or treatment time. It is doubtful whether such water processors can produce qualified drinking water.
Therefore, it is very important to correctly understand the physical and chemical processes of ozone in water and the biochemical processes of ozone sterilization. Because the mechanism of ozone dissolving in water and the effect of ozone on the exchange of biological cells are extremely complex, this article cannot be discussed in detail, only the general discussion of ozone sterilization.
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