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.