UV Ozone Destruction (Removal)

Ozone can come from a variety of sources, and often serves as an important component to a comprehensive water
purification system.  However, residual ozone represents a potential health hazard and it can be damaging to finished
goods, as well as to processing and fabrication equipment.  Using UV to remove ozone has an advantage because UV
does not require additives that may leave behind residuals.  In addition, dissociation of ozone with UV may also help to
oxidize TOC’s.

Germicidal ultraviolet light destroys Ozone in water very quickly.  Therefore, the 254 nm wavelength produced by low-
pressure germicidal UV lamps is quite effective for ozone removal from water.  The mechanism for removing ozone is
dissociation, which occurs when 254 nm UV energy “breaks” one of the oxygen bonds in an ozone molecule.  As a result
of this reaction, each ozone molecule is converted into one oxygen atom and one oxygen molecule.  Free oxygen atoms
will combine with each other to form oxygen molecules.















Germicidal lamps are used for ozone removal because they utilize a quartz envelope that blocks the 185 nm wavelength
generated by low-pressure lamps.  

Although ozone is readily destroyed by UV, it requires more UV energy than inactivation of microorganisms (approx 90
mJ/cm² versus 30 mJ/cm²).  Therefore, in order to ensure effective ozone destruction, UV systems are often sized using a
“flow-rate adjustment” of 40% the flow-rate of a disinfection system.  For example, a system designed for 100 gpm
disinfection flow-rate would be required to achieve 40 gpm for ozone destruction.

This process also creates the hydroxyl radical used in
advanced oxidation processes.
Ozone Water Treatment - Ozone Generators
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UV Ozone Removal (Destruction)

UV Ozone Destruction