Ml. Janex et al., Impact of water quality and reactor hydrodynamics on wastewater disinfection by UV, use of CFD modeling for performance optimization, WATER SCI T, 38(6), 1998, pp. 71-78
In order to ensure reliable operating conditions for adequate wastewater di
sinfection in a UV reactor, two aspects were investigated as having a criti
cal impact on the disinfection performances: water quality and hydrodynamic
s of the water flow through the system. Tests performed with a collimator o
n several wastewater effluents enabled us to relate the UV inactivation to
the total suspended solids content of the water to be treated, the influenc
e being decisive under 5 mg/l TSS. On the other hand, a CFD (Computational
Fluid Dynamics) numerical tool was used to provide an accurate characteriza
tion of the flow pattern within a vertical flow reactor. On the basis of su
ch modeling, modifications in the geometry of the reactor could be proposed
aiming at reducing zones of low dose and therefore improving disinfection
performances. Side-by-side experimental comparisons between modified and un
modified pilots enabled us to validate that approach. (C) 1998 Published by
Elsevier Science Ltd. All rights reserved.