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About UV Oxidation and Disinfection
The Ultraviolet Light Process
In the UV process, proprietary high-powered, medium-pressure
ultraviolet lamps (up to 30 kW) emit high-energy UV radiation through
a quartz sleeve into contaminated groundwater, wastewater, drinking
water, or process water.
Hydrogen peroxide is added to the contaminated water and is then
activated by the UV light to form hydroxyl radicals, which oxidize
dissolved contaminants. The success of the process is based on the
fact that the rate constants for the reaction of the oOH radicals with
most organic pollutants are very high. Hydroxyl radicals typically
react a million to a billion times faster than chemical oxidants such
as ozone or hydrogen peroxide.
When the reaction is complete, the contaminants have been converted
into water, carbon dioxide, and, if the contaminant was chlorinated,
residual chloride.
The Disinfection Process
Not long ago, it had been thought that very high doses of UV light
were required to kill cryptosporidium, but Calgon Carbon Corporation's research
discovered that low UV levels could be used to prevent the parasite
from replicating. In October 2000, the Company was granted a
U.S. patent for controlling cryptosporidium in drinking water using ultraviolet
light.
Calgon Carbon's patented Sentinel™ System provides an effective
barrier against viruses, bacteria and protozoa. UV disinfection is
used to provide highly efficient inactivation of viruses, bacteria and
protozoa — with no disinfection by-products.
Some advantages include:
- Low Cost — Medium-pressure UV technology achieves greater
than 4 log inactivation / removal of cryptosporidium for less than 1 cent
per 1,000 gallons
- Effective — Proven in full-scale testing
- Flexible Design — Can be retrofitted easily to existing systems
- Clean — No disinfection byproducts
- Safe — Fail-safe for operator safety
To learn more about the Sentinel™, view a PDF of our current advertising.
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