What is ultraviolet C band ultraviolet disinfection

by:Funglan     2020-11-23
The air & other; Stealth killer & throughout; Is that the country each year about 116000 people died in the decoration pollution, cause chronic respiratory disease, in fact, since the PM2. 5 pollution, fog, haze events, such as H7N9 extensive contacts with the influenza virus, people more and more attention to air pollution, air pollution how to avoid the violation? So early ultraviolet disinfection sterilization technology application, but we want to know what is the C band ultraviolet ray? Ultraviolet light is a kind of invisible to the naked eye light, the wavelength range is 100 - 40nm( Nm) Exists in the uv spectrum of the lateral, so called ultraviolet light, according to the different wavelength range, was cut into A, B, C three kinds of band, the c-band ultraviolet wavelengths between 240-260 nm, is very effective for sterilization, the wavelength of the strongest point in band is 253. 7nm. C band ultraviolet lamp is commonly known as the ultraviolet germicidal lamp. Germicidal lamp is actually belongs to a kind of low pressure mercury lamp. Low pressure mercury lamp is to use low mercury vapor pressure ( < 102 pa) Ultraviolet light, its spectral lines mainly have two: one is 254 nm wavelength; Another is 185 nm wavelength, and the two are invisible to the naked eye c-band ultraviolet light. C band ultraviolet lamp used in where? Ultraviolet germicidal lamps are commonly used to disinfect the air, surfaces, and water to sterilization. 254 nm wavelength to effectively kill bacteria and viruses, predecessors have made a lot of research, is the fact that there is no doubt that. Ultraviolet sterilization is characterized by broad spectrum, some of the high temperature are hard to kill the virus, in ultraviolet ray can quickly wipe out, this is because the uv sterilization mechanism is different from other methods. Ultraviolet (uv) of killing bacteria and viruses associated with uv exposure dose, for example: dose irradiation time (= S) × Light is strong, μ W/cm2) , exposure dose in theory general design requirements is larger than 30000 & mu; W/cm2 if ultraviolet radiation intensity is low, as long as the time is long, can achieve the same effect when and strength slightly higher, if the time does not allow for a long time, need to choose the high strength and high power uv light. Generally various dose needed to kill bacteria and viruses, illuminate intensity be exterminated in some measure can calculate the irradiation time, to be disinfected objects don't understand, generally need to extend the time of irradiation to ensure the sterilization efficiency. Due to ultraviolet rays can kill cells, therefore should pay attention to when ultraviolet disinfection can't direct illuminate to a person's skin, especially people's eyes, don't look straight tubes, ultraviolet germicidal lamp light because shortwave ultraviolet not through ordinary glass, wearing glasses can avoid injury to the eye. If not narrow-minded injury, usually harmless, just like the sun burned, serious can eye drops or human milk, help recover. On some occasions, do not use ozone tube, when high concentrations of ozone against people. Ultraviolet disinfection application: uv disinfection sterilization USES is very wide, hospitals, schools, nurseries, cinemas, buses, office, family, etc. , it can purify air, eliminate mildew, time also can produce a certain amount of negative oxygen ions, ultraviolet germicidal lamp life and high reliability is required, if the lamp life is short, replacement lamp cost is high, and it is not convenient. So, ultraviolet sterilization disinfection in water has incomparable advantages: ultraviolet intensity can be measured, can be monitored, can do online control, in a timely manner to understand the disinfection effect, and will not have any side effects.
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