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Militaru C.-M.,Polytechnic University of Timisoara | Todinca T.,Polytechnic University of Timisoara | Filep A.-D.,Polytechnic University of Timisoara | Line A.,INSA Toulouse | Pacala A.,Water and Sewerage Company Aquatim
Environmental Engineering and Management Journal | Year: 2013

The hydrodynamics of two equipments from a surface water treatment pilot plant has been investigated through residence time distribution (RTD) experiments using brine solution as tracer. Computational Fluid Dynamics (CFD) procedure, which is increasingly utilized to study a wide variety of complex environmental fluid mechanics processes, was used to predict the flow patterns and other properties of flowing fluids (e.g. velocity, concentration of species etc.). In this work, ANSYS Fluent 14.0 has been chosen as CFD modeling environment and a standard k-e{open} turbulence model (along with Reynolds Averaged Navier-Stokes equations) was used to describe the transport of the turbulence kinetic energy and dissipation rate per unit in time. The tracer behavior was simulated by incorporating a user-defined scalar (UDS) in the CFD model. The comparison of the simulation results with RTD experimental data has clearly shown that by using CFD software it is possible to predict the flow patterns and the degree of variability of energy dissipation along the pilot plant line, allowing variations in turbulent kinetic energy to be taken into account in the evaluation of equipments efficiency.

Militaru C.-M.,Polytechnic University of Timisoara | Pacala A.,Water and Sewerage Company Aquatim | Vlaicu I.,Water and Sewerage Company Aquatim | Bodor K.,Water and Sewerage Company Aquatim | And 2 more authors.
World Academy of Science, Engineering and Technology | Year: 2011

A mathematical model for the hydrodynamics of a surface water treatment pilot plant was developed and validated by the determination of the residence time distribution (RTD) for the main equipments of the unit. The well known models of ideal/real mixing, ideal displacement (plug flow) and (one-dimensional axial) dispersion model were combined in order to identify the structure that gives the best fitting of the experimental data for each equipment of the pilot plant. RTD experimental results have shown that pilot plant hydrodynamics can be quite well approximated by a combination of simple mathematical models, structure which is suitable for engineering applications. Validated hydrodynamic models will be further used in the evaluation and selection of the most suitable coagulation-flocculation reagents, optimum operating conditions (injection point, reaction times, etc.), in order to improve the quality of the drinking water.

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