This project evaluated a medium pressure
ultra-violet (UV) reactor downstream from a conventional surface water
treatment plant to determine the UV dose delivered by the reactor. The
data was compared with computational fluid dynamics (CFD) results
under the same test conditions to determine if CFD could accurately
predict the dose.
The UV disinfection reactor was challenge tested with MS2 coliphage at
a flowrate of 200 gpm and 600 gpm. The CFD model gave excellent
agreement at the 600 gpm case as the predicted dose was within 3% of
the dose obtained by biodosimetry. The CFD dose for the 200 gpm case
was high by about 17% compared to that observed by biodosimetry. In
general, the CFD model was able to accurately predict the dose
obtained by biodosimetry within 3%-17%. This is well within the range
of error expected in biodosimetry experimentation. The model was
tested over a wide range of both flow rate (200 and 600 gpm) and
number of lamps operating (1 or 4 lamps) in a Calgon Carbon 4x1 kW
Sentinel UV Disinfection Reactor.
CFD plays an important role for efficient reactor design at Calgon
Carbon Corporation. CFD is currently being utilized to optimize the
existing reactor designs with results showing that disinfection
treatment efficiency gains of up to 25-35% can be realized. Future
challenge studies incorporating these reactor modifications will be
compared with CFD predictions.
Authors: Wayne Lem, P.Eng., Calgon Carbon
Corporation, Pittsburgh, Pennsylvania, USA.
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