Sedimentation Tanks for Treating Rainwater: CFD Simulations and PIV Experiments

Krystian Czernek, Marek Ochowiak, Daniel Janecki, Tomasz Zawilski, Leszek Dudek, Stanisław Witczak, Andżelika Krupińska, Magdalena Matuszak, Sylwia Włodarczak, Michał Hyrycz and Ivan Pavlenko
Additional contact information
Krystian Czernek: Faculty of Mechanical Engineering, Opole University of Technology, 45-758 Opole, Poland
Marek Ochowiak: Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Daniel Janecki: Institute of Environmental Engineering and Biotechnology, University of Opole, 45-032 Opole, Poland
Tomasz Zawilski: Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Leszek Dudek: Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Stanisław Witczak: Faculty of Mechanical Engineering, Opole University of Technology, 45-758 Opole, Poland
Andżelika Krupińska: Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Magdalena Matuszak: Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Sylwia Włodarczak: Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Michał Hyrycz: Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland
Ivan Pavlenko: Department of Computational Mechanics Named after V. Martsynkovskyy, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine

Energies, 2021, vol. 14, issue 23, 1-15

Abstract: The removal of solids is the most important step when treating rainwater. The article evaluates two designs of sedimentation tanks that can be used for the continuous separation of fine particles from water: OS—standard sedimentation tanks, and OW—swirl sedimentation tanks. The tanks were studied by conducting computational fluid dynamics (CFD) modeling and particle image velocimetry (PIV) experiments. The settling process in sedimentation tank was carried out at varying operating flow rates. A tank with a modified structure was used for the tests, where water was supplied by a nozzle placed at an angle. This solution made it possible to obtain a rotational flow that transported the suspended particles towards its wall, where downward axial velocity resulted in the settling of particles. Based on the research, it was observed that the flow patterns showed inward flow at the bottom of the tank and an upward flow and the lifting of the settled particles near the hatch at the bottom. The presented experimental measurements provided detailed insight into flow patterns, and valuable calibration and verification data for further CFD modeling. Traditional PIV techniques are useful in the case of standard design, whereas CFD is invaluable for supporting this work and for investigating the design of novel sedimentation tanks.

Keywords: CFD; PIV; rainwater treatment; sedimentation tank; swirl motion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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