Ultraviolet light (UV) with wavelength shorter
than 300 nanometers is extremely effective in killing microorganisms. The
most effective sterilizing range of UV is within the C bandwidth (UVC -
253.7nm). This range is called germicidal UV bandwidth or UVC. UVC has
extremely low penetrating ability and does not penetrate past the deadcell layers of the skin.
UV will cause eye irritations or burns after
Germicidal UV has been used in water disinfection
systems for many years. As stated by the American Water Works
Association, "... UV light disinfection process does not use chemicals.
Microorganisms, including bacteria, viruses, and algae, are inactivated
within seconds of UV light disinfection... UV light is effective in
inactivating Cryptosporidium, while at the same time decreasing
chlorinated disinfection by-products... "
The UV topics below offer detailed information on
the nature of the ultraviolet light, science research, facts and
conclusions for UV effectiveness. Most
importantly, artificially produced UV light by germicidal UV lamps can be utilized to improve the indoor air quality
and introduce a healthier environment to live, work or study.
The science behind the UV light
UV Dosage - Ultraviolet sterilization dosage for mold,
viruses, bacteria, protozoa and yeast
How UV light kills germs
UV Lamps - Artificial UV Production
UV Definitions and UV Terminology
Indoor Air Quality and People's Health
Indoor Air Pollution - Air Pollutants
Ultraviolet (UV) Disinfection
The UV light
disinfection process does not use chemicals.
Microorganisms, including bacteria, viruses, and algae, are
inactivated within seconds of UV light disinfection, but all are
not equally sensitive. Generally, viruses and algae are more
resistant to disinfection by UV light.
UV light is effective in inactivating Cryptosporidium,
while at the same time decreasing chlorinated disinfection
UV disinfection is used in air and water purification,
sewage treatment, protection of food and beverages, and many other
disinfection and sterilization processes.
One major advantage of UV light disinfection is that it is
capable of disinfecting water faster than chlorine, and without
the need for retention tanks.
There are many types of lamps
that artificially produce UV. There are UV lamps for tanning,
blacklight stage lamps and lamps for mineral displays, lamps that
produce Ozone and germicidal UV lamps. Germicidal UV lamps emit
shortwave UV light in the ultraviolet section of the specter also
known as UVC or germicidal UV...