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The Science of UVC

Mar. 04, 2021

The sterilization principle of UVC

Among the various wavelengths of UVC, only short-wave UVC has germicidal disinfection, which is a purely physical disinfection method with broad-spectrum efficiency, fast and thorough, no need to add chemicals, no drug resistance, no secondary pollution and other characteristics. UVD with a wavelength of 185nm can turn oxygen O2 in the air into ozone O3, which has a strong oxidising effect and can effectively kill bacteria, but UVC with a wavelength of 185nm itself does not have a sterilising effect. The dispersion of ozone can make up for the shortcomings of UVC, which can only spread in a straight line and has a dead end, and can reach any corner of the space with the air, making disinfection more complete.

UVC purification and disinfection machine can achieve the effect of filtering drinking water to eliminate bacteria and viruses.The medical community, food industry and public water systems have long recognized that UV and carbon filters are highly effective in destroying bacteria in drinking water, and are actively and widely using these technologies.

Germicidal characteristics of UVC

High efficiency sterilisation: The sterilisation effect of UVC on bacteria and viruses is generally completed within seconds, almost instantaneously, with a sterilisation capacity 600-3000 times greater than chlorine.

Germicidal broad-spectrum: UVC technology has the highest germicidal broad-spectrum of all current disinfection technologies. It is highly efficient in killing almost all bacteria and viruses.

UVC Water Purification and Disinfection Machine

More thorough sterilisation: UVC combined with ozone (UVC + O3) provides a more powerful and thorough sterilisation power. UVC irradiates the air and surface of objects in a straight line to achieve powerful sterilisation; ozone penetrates into all corners of the room with the air to completely kill indoor bacteria.

Completely environmentally friendly: Germicidal disinfection is carried out by ultraviolet lamps, which irradiate the oxygen in the air to produce ozone, which kills bacteria and viruses by strong oxidation, without adding any chemicals to the whole sterilisation process.

There is no drug resistance: UV or ozone directly destroys the DNA, RNA and proteins in the cells of bacteria and viruses, causing direct cell death and preventing reproduction, so there is no drug resistance. Other chemical sterilization agents will cause bacteria and viruses to develop resistance, which will cause the sterilization effect of the chemical agent to fail.

No secondary pollution: UVC and ozone cause direct death of bacteria and viruses without any other chemical pollutants; at the same time, ozone is converted into oxygen in 15-30 minutes at room temperature (ozone half-life), so there is no residual secondary pollution.

UVC's germicidal efficiency

Germicidal efficiency of UVC for common bacteria and viruses (radiation intensity: 30,000μW/cm2)

Bacteria Name Killing time

Bacillus anthracis 0.3 seconds, Bacillus tetani 0.3 seconds, Bacillus dysentery 1.5 seconds, Bacillus coli 0.4 seconds, Staphylococcus spp. 1.3 seconds, Mycobacterium tuberculosis 0.4 seconds, Influenza virus 0.3 seconds, Poliovirus 0.8 seconds, Hepatitis B virus 0.8 seconds, Mycobacteriophage 0.2 seconds, Aspergillus niger 0.3 to 6.7 seconds, Trichoderma spp. 4.6 seconds, Penicillium spp. 0.9 to 3.0 seconds, Ranunculus spp. 10 to 40 sec, nematode eggs 3.4 sec, green algae 1.2 sec, protozoa spp. 4.0 to 6.7 sec, leukoplakia 2.7 sec, infected pancreatic necrosis 4.0 sec, viral haemorrhagic disease 1.6 sec.

The information is provided by the UVC disinfection machine supplier.




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