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Article

Hydrodynamic Evaluation of Five Influent Distribution Systems in a Cylindrical UASB Reactor Using CFD Simulations

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Departamento de Recursos Hídricos y Ciencias Ambientales, Universidad de Cuenca, Cuenca 010203, Ecuador
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Departamento de Química Aplicada y Sistemas de Producción, Universidad de Cuenca, Cuenca 010203, Ecuador
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PROMAS, Universidad de Cuenca, Cuenca 010203, Ecuador
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AM-TEAM, Oktrooiplein 1, 9000 Ghent, Belgium
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BIOMATH, Department of Data Analysis and Mathematical Modelling, Ghent University, 9000 Ghent, Belgium
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Facultad de Ingeniería, Universidad de Cuenca, Cuenca 010203, Ecuador
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Pezzinga
Water 2021, 13(21), 3141; https://doi.org/10.3390/w13213141
Received: 13 October 2021 / Revised: 30 October 2021 / Accepted: 3 November 2021 / Published: 8 November 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
UASB reactors are a promising option for environmentally friendly wastewater treatment due to their reduced carbon footprint and their capacity to treat a variety of wastewater strengths, among other recognized advantages over alternative wastewater treatment systems. The Influent Distribution System (IDS) is a critical structure for generating granules in a UASB reactor since it provides the required flow hydrodynamics for their formation. Thus, the objective of this study was to evaluate and compare the efficiency of five IDS configurations to generate ideal granulation conditions using Computational Fluid Dynamics (CFD) simulations. The IDS configurations were as follows: (C1) single radial inflow, (C2) upward axial inflow, (C3) downward distributed axial inflow, and two novel configurations in the form of (C4) double opposite radial inflow and (C5) downward tangential inflow. The hydrodynamic response of configuration C1 was validated in a physical model with dynamic Froude similitude. The granulation measurement was velocity-based in the reactor reaction zone using steady-state CFD simulations. The novel IDS configuration C4 was the one that resulted in the highest granulation volume, with up to 45.5% of the potential granulation volume of the UASB reactor, in contrast to the IDS C2 that obtained the lowest granulation with only 10.8%. Results confirm that the IDS directly impacts the hydrodynamics of the reactor and that model-based design can be used to ascertain IDS configurations that better promote granulation in UASB reactors. View Full-Text
Keywords: wastewater treatment; computational fluid dynamics (CFD); UASB; influent distribution system (IDS); opposite radial inflow; granulation wastewater treatment; computational fluid dynamics (CFD); UASB; influent distribution system (IDS); opposite radial inflow; granulation
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MDPI and ACS Style

Cisneros, J.F.; Cobos, F.; Pelaez-Samaniego, M.R.; Rehman, U.; Nopens, I.; Alvarado, A. Hydrodynamic Evaluation of Five Influent Distribution Systems in a Cylindrical UASB Reactor Using CFD Simulations. Water 2021, 13, 3141. https://doi.org/10.3390/w13213141

AMA Style

Cisneros JF, Cobos F, Pelaez-Samaniego MR, Rehman U, Nopens I, Alvarado A. Hydrodynamic Evaluation of Five Influent Distribution Systems in a Cylindrical UASB Reactor Using CFD Simulations. Water. 2021; 13(21):3141. https://doi.org/10.3390/w13213141

Chicago/Turabian Style

Cisneros, Juan F., Fabiola Cobos, Manuel Raul Pelaez-Samaniego, Usman Rehman, Ingmar Nopens, and Andrés Alvarado. 2021. "Hydrodynamic Evaluation of Five Influent Distribution Systems in a Cylindrical UASB Reactor Using CFD Simulations" Water 13, no. 21: 3141. https://doi.org/10.3390/w13213141

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