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Why does ultraviolet light have a disinfecting effect

Date:Jan 11, 2021

      Ultraviolet rays with a wavelength range of 200 to 280nm have a disinfecting effect. It is absorbed by the DNA of microorganisms, destroying its structure and inactivating living cells. Therefore, ultraviolet rays can make viruses, bacteria, yeasts and fungi harmless in a few seconds. If the radiation intensity is high enough, ultraviolet disinfection is a reliable and environmentally friendly method because no chemicals are required. In addition, microorganisms cannot be resistant to ultraviolet radiation.

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      How effective is UV light against viruses, bacteria ?

      Ultraviolet rays can inactivate up to 99,9999% of microorganisms. Since viruses have the simplest cell structure, they are inactivated first. In addition, they cannot produce resistance to ultraviolet light. Independent research has proved that UV-C radiation can inactivate SARS-CoV-2 (coronavirus) and COVID-19.

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What are the applications that benefit from UV?

Air sterilization

      Microorganisms in the air, such as viruses, bacteria, yeasts and molds, especially appear in crowded areas such as airports, hospitals and theaters. They endanger people's health, contaminate raw materials, and cause food to spoil. Ultraviolet radiation can reliably reduce the bacterial load and improve hygiene and storage conditions. Sterilizing the air in the supply air duct ensures long-term effective reduction of microorganisms. Especially short-wave ultraviolet radiation has a strong bactericidal effect. The radiation is absorbed by the microbe's DNA, destroying its structure. This inactivates living cells.

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Food sterilization

      The food packaging process needs to completely remove harmful bacteria such as bacteria, yeasts and fungi. UVC disinfection is a dry and chemical-free method that can reduce the bacterial load by 99.9%. Just a few seconds of ultraviolet light is enough to spoil the harmless food on the sealing foil and yogurt cup, such as bacteria, yeast or fungus, and achieve an effective and extensive sterilization effect.

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UV water treatment and disinfection

      Environmental protection and energy-saving water treatment and disinfection with ultraviolet rays include ballast water, industrial production water, drinking water, municipal sewage, and water treatment for aquaculture, agriculture and gardening. It does not use any chemicals, such as chlorine or ozone. Special UV lamps can destroy microorganisms including bacteria, viruses and parasites, and help decompose harmful chemicals without affecting the smell or taste of water.

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