Modelling and simulation of the disinfection process by ozonation in an industrial plant

info:eu-repo/semantics/publishe

MARANGONI-BÉNARD INSTABILITY IN MICROGRAVITY: ANALYSIS OF THE INFRARED DATA GENERATED DURING THE BAMBI FOTON-M2 EXPERIMENT AND COMPARISON WITH THEORY

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Numerical comparison of impeller design for laccase production by white rot fungi in stirred tank

info:eu-repo/semantics/nonPublishe

Marangoni ‐ Bénard Instability in Microgravity: Analysis of the infrared and velocimetry Data generated during the BAMBI FOTON ‐ M2 Experiment and Comparison with Theory

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Marangoni-Bénard instability in μ-gravity: PTV-analysis of the velocimetry data generated during the BAMBI - FOTON-M2 experiment

The BAMBI (Bifurcation Anomalies in Marangoni-Bénard ́Instabilities) experiment has been successfully flown onboard the FOTON-M2 satellite in June 2005. During the 4 days available for the experiment, a 5mm-thick 200 cSt silicone oil layer in a 10x10cm^2 wide container,and in contact with a similarly-sized helium gas layer was heated from below and cooled from above. By varying the heating power applied at each experimental step, a range of temperature differences across the liquid and gas layers was scanned and the onset and evolution of the Marangoni-Bénard instability typical for this type of configuration was examined. The used optical diagnostics were Infrared Thermography of the liquid/gas interface, PTV (multiple views and heights in the liquid layer), Wollaston Interferometry and Electronic Speckle Pattern Interferometry. The present contribution focuses on the velocity results obtained by PTV in the interface plane, and discusses them in relation both with infrared images, and with theory/numerics.info:eu-repo/semantics/publishe

Modeling of bisphenol A degradation using insolubilized/immobilized laccase

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Ozone inactivation of resistant microorganisms: Laboratory analysis and evaluation of the efficiency of plants

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Ozone disinfection efficiency of resistant microorganisms assessed at a drinking water treatment plant by combining inactivation kinetics and computational fluid dynamics

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Development of a tool, using CFD, for the assessment of the disinfection process by ozonation in industrial scale drinking water treatment plants

Foreseen standards regarding microorganism content for drinking water require assessment of the capability of existing plants to reach the upcoming requirements. This paper presents the development of a tool to assess this capability in a commonly encountered key step of water disinfection: ozonation. In this paper, this tool is applied to the test case of an ozonation channel of the Belgian drinking water producer VIVAQUA. This tool is based on a mathematical model of the momentum and mass transport phenomena in an ozonation channel. The gas-liquid flow is coupled to ozone mass transfer and kinetics describing the ozone and microorganisms concentrations decay. The degradation of Bacillus subtilis spores, as a representative of resistant microorganisms, is implemented in the model. The model takes explicitly into account the bubble size variation and its impact on mass transfer. Bubbles sizes and kinetics parameters are estimated based on dedicated experiments. The model is partially validated by comparing simulations results, obtained using Computational Fluid Dynamics, to experimental residence time distributions, residual ozone concentration and Bacillus subtilis spores degradation efficiency measurements obtained on the studied ozonation channel. It is shown that, at the industrial scale, bubble diameter variation has a significant impact on ozone concentration in the liquid at the reactor exit. Using the tool, it is also shown that, the ozonation channel of VIVAQUA can be used to achieve degradation of resistant microorganisms but only with its maximal flow rate and concentration of ozone injection.info:eu-repo/semantics/publishe

Single-phase flow model development for macro mixing evaluation in an aerated tank, by computational fluid dynamics

info:eu-repo/semantics/inPres