Journal
BIORESOURCE TECHNOLOGY
Volume 227, Issue -, Pages 102-111Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.12.027
Keywords
CFD; MBR; Hydrodynamics; Fouling; Cake layer
Funding
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2015ZX07203-005]
- National Natural Science Foundation of China [51278483]
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Membrane fouling is an important issue for membrane bioreactor (MBR) operation. This paper aims at the investigation and the controlling of reversible membrane fouling due to cake layer formation and foulants deposition by optimizing MBR hydrodynamics through the combination of computational fluid dynamics (CFD) and design of experiment (DOE). The model was validated by comparing simulations with measurements of liquid velocity and dissolved oxygen (DO) concentration in a lab-scale submerged MBR. The results demonstrated that the sludge concentration is the most influencing for responses including shear stress, particle deposition propensity (PDP), sludge viscosity and strain rate. A medium sludge concentration of 8820 mg L (1) is optimal for the reduction of reversible fouling in this submerged MBR. The bubble diameter is more decisive than air flowrate for membrane shear stress due to its role in sludge viscosity. The optimal bubble diameter was at around 4.8 mm for both of shear stress and PDP. (C) 2016 Elsevier Ltd. All rights reserved.
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