UV Reactor Performance Modeling by Eulerian and Lagrangian Methods

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• 作者：D. Angelo Sozzi and Fariborz Taghipour
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：March 1, 2006
• 年：2006
• 卷：40
• 期：5
• 页码：1609 - 1615
• 全文大小：462K
• 年卷期：v.40,no.5(March 1, 2006)
• ISSN：1520-5851

文摘

A study was performed to investigate the influence ofhydrodynamics on the performance of ultraviolet (UV) reactors.Two general UV disinfection models were developed byintegrating fluence rate models and inactivation kineticswithin a commercial computational fluid dynamics (CFD)software package to predict reactor performances.Both a particle tracking (Lagrangian) random walk modeland a volumetric reaction rate based (Eulerian) model wereimplemented. Simulations were performed for twocharacteristic annular single-lamp UV reactor configurations,with inlets concentric (L-shape) and normal (U-shape) tothe reactor axis. Two fluence rate models, the infinite linesource assumption and the finite line or multiple pointsource summation (MPSS), were used. First-order inactivationkinetics was assumed for disinfection, with rate constantsfrom MS2 bacteriophage assays. The simulation resultsprovided detailed information on the velocity profiles, reactionrates, range of absorbed dose, and areas of shortcircuiting of the UV reactors. Model predictions based onboth the Lagrangian dose distribution and Eulerianconcentration distribution were in good agreement witheach other at high flow rates but showed some discrepanciesat lower flow rates. Experimental verification of thegeneral models was performed by simulating the disinfectionperformance of an industrial prototype UV reactor.Results from both integration approaches were shown tobe in good agreement with the provided biodosimetry data.