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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

new correlation for the coefficient of restitution of particles with low mechanical resistance for modeling wastewater treatment biofilm reactor

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Melo, Karla R. B. [1] ; Grace, John R. [2] ; Lopes, Gabriela C. [3, 1]
Total Authors: 3
[1] Univ Fed Sao Carlos, Chem Engn Grad Program, Rod Washington Luiz, Km 235 SP 310, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ British Columbia, Dept Chem & Biol Engn, 2360 East Mall, Vancouver, BC V6T 1Z3 - Canada
[3] Univ Fed Sao Carlos, Dept Chem Engn, Rod Washington Luiz, Km 235 SP 310, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Clean Technologies and Environmental Policy; v. 24, n. 2, SI APR 2021.
Web of Science Citations: 2

Fluidized bed bioreactors are widely used in wastewater treatment applications. Such reactors employ gel beads or hard particles covered with a biofilm layer. These particles lose more energy due to deformation when they collide than particles with high mechanical resistance. This energy loss can result in heterogeneity in particle distribution, increasing the drag on them, which, if not considered properly, can lead to problems in reactor design and operation. Therefore, it is important to know how much energy is dissipated by particles with low mechanical strength during collisions. In this context, the coefficient of restitution of alginate particles synthesized using different cationic solutions was determined experimentally. The influence of the Young's modulus, size and roughness of the particles, as well as the impact velocity, on the coefficient of restitution was investigated. Results indicate that the coefficient of restitution is directly proportional to the particle Young's modulus and inversely proportional to the impact velocity. A correlation is proposed to estimate the coefficient of restitution as a function of particle density, Young's modulus, impact velocity and maximum deformation in the elastic regime, with R-2 = 0.9219. This correlation provides a potential tool for determining the coefficient of restitution to be used in simulating the dynamics of the flow in fluidized bed bioreactors in wastewater treatment. (AU)

FAPESP's process: 18/20711-2 - Modeling and experimental analysis of the flow of soft spheres in viscous fluids: study of particle-particle and surface-particle collisions and particle-fluid interaction
Grantee:Karla Raphaela Braga de Melo
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 18/16036-8 - Inelastic collisions and its influence on dynamic aspects of liquid-solid flow: an experimental and numerical study
Grantee:Gabriela Cantarelli Lopes
Support Opportunities: Regular Research Grants