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Hydrodynamics and permeability of aerobic granular sludge: The effect of intragranular characteristics and hydraulic conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
2749 129 2016 8 PDF Available
Title
Hydrodynamics and permeability of aerobic granular sludge: The effect of intragranular characteristics and hydraulic conditions
Abstract

•A model of individual granules exposed to different hydraulic conditions was established.•Their fluid dynamics were analyzed using CFD modeling approach.•A new simulation was developed to evaluate the fluid collection efficiency.

Aerobic granulation technology has been widely investigated for its efficient treatment of municipal and industrial wastewater. The efficiency and stability, which are affected by the permeability and forces on granule surface, are both crucial to its full scale application. In this work, the structural and hydrodynamic characteristics of the granules were investigated using experimental approach and numerical simulations. Aerobic granule was considered to be a porosity sphere composed of smaller particles. Mixture model in FLUENT was used for gas-liquid two-phase flow simulation, and the phase resistance was calculated using schiller-naumann function. The influence of gas holdup and granule size on the surface force was simulated and the results show that the shear stress increases with the gas holdup, while the granule size has little effect on the surface force. Using the computational fluid dynamics (CFD) numerical model, it was demonstrated that the convection path lines for the granules colored by the velocity magnitude increase with the Reynolds number and the primary particle diameter. The model also indicated that improving the permeability of a granule can reduce the total pressure on the granule surface, but it has less effect on the strain rate. In addition, a new simulation was developed to evaluate the fluid collection efficiency, which proved to be in good agreement with the results determined by formulas and experiments.

Keywords
Aerobic granule; Fluid collection efficiency; Hydrodynamic characteristics; Reynolds number; Strain rate
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Hydrodynamics and permeability of aerobic granular sludge: The effect of intragranular characteristics and hydraulic conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 113, 15 September 2016, Pages 133–140
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us