Comparison of CFD, Biodosimetry and Lagrangian Actinometry to Assess UV Reactor Performance

Computational fluid dynamics (CFD) is becoming increasingly popular for assessing UV reactor performance. However, due to uncertainties in flow fields, lamp output and microbial response to UV, the CFD model needs to be validated by measurements. The combination of several experimental techniques with CFD modeling allows for a thorough understanding of the dominant processes occurring in UV reactors. Therefore, CFD modeling, Lagrangian actinometry and biodosimetry experiments were performed for a cross-flow UV reactor. A good agreement was found between biodosimetry and CFD modeling. Lower inactivation levels were found for the Lagrangian actinometry method, which was explained by fluorescence decay of the microspheres.

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