Quantification of the shear stresses in a microbial granular sludge reactor

Ren, Ting-Ting, Mu, Yang, Liu, Li, Li, Xiao-Yan and Yu, Han-Qing (2009) Quantification of the shear stresses in a microbial granular sludge reactor. Water Research, 43 18: 4643-4651. doi:10.1016/j.watres.2009.07.019


Author Ren, Ting-Ting
Mu, Yang
Liu, Li
Li, Xiao-Yan
Yu, Han-Qing
Title Quantification of the shear stresses in a microbial granular sludge reactor
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2009-10
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.watres.2009.07.019
Volume 43
Issue 18
Start page 4643
End page 4651
Total pages 9
Editor Mogens Henze
David Dixon
Jean-Claude Block
Place of publication United Kingdom
Publisher Pergamon
Collection year 2010
Language eng
Subject C1
Abstract Since a certain level of hydrodynamic shear force is needed in the formation of microbial granules for wastewater treatment, a method for quantifying the shear stresses in a microbial granular sludge reactor is highly desirable. In this work a novel energy-dissipation-based model was established and validated to quantitatively describe the shear stresses in a granular sludge sequencing batch reactor (SBR). With this model, the shear stress at the solid–liquid interface in an SBR was estimated and the relative magnitudes of shear stresses induced by fluid, gas bubble and collision on granules were evaluated. The results demonstrate that the effect of reactor geometry on the global shear stress was significant. Both the shear stress at the microbial granule surface and the biomass-loss rate increased with an increase in biomass concentration in the SBR. The gas bubble and the collision were found to be the main source for the shear stress at the granule surface.
Keyword Activated sludge
Energy dissipation
Granule
Hydrodynamic
Model
Shear stress
Sequencing batch reactor (SBR)
SEQUENCING BATCH REACTOR
AEROBIC GRANULES
AIRLIFT BIOREACTORS
BIOFILM STRUCTURES
DISSOLVED-OXYGEN
BUBBLE-COLUMNS
GAS-LIQUID
TURBULENCE
PARTICLES
2-PHASE
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Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Sun, 22 Nov 2009, 00:00:26 EST