Xinhua News Agency, Beijing, May 19, a new media special report foreign media said that a study jointly conducted by researchers from Australia, Bolivia, Canada and Switzerland showed that ultraviolet radiation may be less affected by the new crown virus and infected by the new crown virus at altitudes above 3000 meters. A key factor in the small number of people.
In the initial stage of the outbreak in my country, the National Health Commission issued the "New Coronavirus Infection Pneumonia Diagnosis and Treatment Plan (Trial Version 5)" (hereinafter referred to as the "plan"). And heat sensitive.
↑Screenshot of the plan (trial version 5)
In fact, it is not just the new coronavirus. According to experts from the 302 Hospital of the People's Liberation Army, the Ebola virus that broke out abroad can be completely inactivated by ultraviolet radiation for 2 minutes. In addition, for some common viruses and bacteria, ultraviolet light is also a very good weapon. The H7N9 avian influenza virus is also a highly contagious virus before. Lu Ning, director of the relevant national department, said that high temperature and ultraviolet rays can easily kill it.
Is ultraviolet light really that powerful? How does it kill the virus? This is about its sterilization principle.
1. Principle of UV sterilization
The sterilization principle of ultraviolet sterilizer is to use ultraviolet rays to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in microbial cells, causing growth cell death and (or) regenerative cell death to achieve sterilization. Effect. It is mainly to break various structural bonds in DNA or cause photochemical polymerization, such as dimerization of THYMINE in DNA, so that various viruses, bacteria and other pathogens lose the ability to replicate and reproduce and achieve the effect of sterilization. Therefore, ultraviolet rays can easily kill any microorganisms that are directly irradiated. In theory, it is an ideal sterilization method. The new crown virus, H7N9 and Ebola virus are all RNA viruses, which can be naturally killed by direct exposure to ultraviolet light.
Principle of UV sterilization
2. The historical process and application of ultraviolet light
Ultraviolet disinfection has a long history. In 1901, mankind invented the first ultraviolet mercury arc lamp. In 1910, Cemovedeow and Henvi used ultraviolet light to disinfect drinking water for the first time. In 1970, the U.S. Environmental Protection Agency completed the first demonstration project of ultraviolet disinfection of sewage. With the passage of time, the effect of ultraviolet rays on the removal of bacteria and viruses in water has been recognized by the water supply and drainage industry and the majority of users.
The Finsen Lamp invented by the Danish doctor Niels Ryberg Finsen (the original version of the ultraviolet lamp commonly used today)
After entering the 21st century, with people’s increasing attention to hygiene and health and the rapid development of ultraviolet disinfection technology, ultraviolet sterilizers are widely used in the preparation of pure water and high-purity water in water tanks and pumps, food and beverage processing, medicine, chemical industries and other industries. Industries such as secondary water supply, aquaculture, and swimming pools have broad application prospects in environmental water treatment.
For a long time, the circulating water system of swimming pools usually adopts chlorine disinfection method. However, the chlorine in the pool water reacts with the sweat, urine and other amino organic substances brought into the pool by the swimmer to form chloramines and produce toxic by-products such as trihalomethanes. , It will not only have peculiar smell, irritate human skin and eyes, affect human health, but may even endanger life. By adopting ultraviolet disinfection and sterilization, the dosage of chemical agents can be reduced by at least 50%.
Ultraviolet disinfection is a kind of physical disinfection technology. It destroys the survival of bacteria, viruses and microorganisms through ultraviolet radiation photochemical action. It does not need to add other chemicals to the pool water. Therefore, ultraviolet disinfection will not change the physical and chemical properties of the water and produce no other The harmful by-products and bad odors produced by chemical disinfectants will not cause secondary pollution to the pool water; it will not corrode the facilities in the pool, purification equipment, pipelines, etc., will not affect the health of swimmers, and it can also decompose chloramines. It has unique advantages and room for development in terms of energy saving, consumption reduction, and environmental protection. Therefore, it has gradually replaced the traditional chlorine disinfection process in the swimming pool water treatment industry and has become one of the mainstream disinfection methods.
3. Classification of UV disinfection systems
At present, most of the light sources of ultraviolet disinfection equipment on the market come from mercury arc lamps (commonly known as ultraviolet lamps or mercury lamps). Among them, depending on the pressure of mercury vapor in the tube, it is divided into low-pressure mercury lamps and medium-pressure mercury lamps, which are usually also called low-pressure ultraviolet disinfection equipment and medium-pressure ultraviolet disinfection equipment.
AQUA amalgam lamp UV lamp real shot (amalgam lamp imported from the United States)
⑴ Low-pressure ultraviolet disinfection system
Low-pressure ultraviolet light means that the pressure of the inert gas filled in the lamp is lower than the atmospheric pressure about 0.013MPa, and the power of a single lamp tube is 320W. The mercury vapor in the lamp tube will be activated to emit 253.7nm and 185nm ultraviolet rays, and 253.7nm ultraviolet rays are irradiated To the neighboring mercury ions, a resonance absorption effect will be generated, and the irradiated mercury atoms will further release ultraviolet rays to achieve the purpose of disinfection.
Low-pressure ultraviolet light can meet the water treatment requirements of general processing capacity, and is suitable for systems that require frequent opening and closing operations. The low-pressure ultraviolet lamp has high conversion efficiency, up to 40% of the power is converted into sterilization energy, and the cost is low, so it is widely used Municipal water supply, surface water, industrial water, swimming pool water, circulating cooling water, small flow water supply disinfection, etc. For example, AQUA's amalgam lamp UV sterilizer and AQUA's stainless steel ultraviolet sterilizer UVS series belong to low-pressure ultraviolet rays.
AQUA--UVS ultraviolet and amalgam lamp ultraviolet
AQUA--MUV Medium Pressure Ultraviolet
4. Advantages of AQUA UV
According to AQUA technicians, AQUA ultraviolet has an effective killing effect on most known bacteria. It can also oxidize organic matter in the water and destroy some of the structure that can cause turbidity in the water. Combining with the AQUA filter system can continuously improve The penetration rate of water quality achieves better sterilization effect. And temperature will not affect the sterilization effect of AQUA ultraviolet rays, so it is not only suitable for swimming pools, landscape pools, reclaimed water treatment, etc., but also extremely suitable for hot water baths such as hot springs and SPAs.
It is reported that Nanjing Jiangbei New District Civic Center Landscape Pool, Hainan Lingshui Qingshuiwan Sea Yard, Lingshui Li Autonomous County. Shunze. Fuwan Villa, Country Garden in Xuchang City, Henan Province and other high-end villas, landscape pools and other large-scale projects have selected AQUA swimming pool UV Water treatment equipment.
Lingshui Li Autonomous County. Shunze. Fuwan Villa
Country Garden Villa Swimming Pool in Xuchang City, Henan Province
Hainan Lingshui Qingshuiwan Sea Yard
Landscape Pool of Civic Center in Nanjing Jiangbei New District
AQUA ultraviolet sterilization has a high broad spectrum, and it can effectively remove the microorganisms Cryptosporidium, Giardia, and non-tuberculous mycobacteria that cannot be killed by chlorine. The pool water disinfected by AQUA ultraviolet rays has no chemical residues, no corrosiveness, no toxic side effects, no harm to human skin and body health, the water quality is clear, the equipment is safe and stable, and the operation is simple and easy to understand. The customer said Very satisfied, and affirmed and appreciated the performance and quality of the product.
The sanitation and safety of swimmers and swimmers should not be ignored. The owners must choose appropriate disinfection methods when constructing water treatment projects, so as to better prevent the spread of diseases and ensure the safety of swimmers and swimmers.