DOI: 10.1016/j.watres.2018.08.036
Scopus记录号: 2-s2.0-85052996457
论文题名: Effect of biofilm structural deformation on hydraulic resistance during ultrafiltration: A numerical and experimental study
作者: Jafari M. ; Desmond P. ; van Loosdrecht M.C.M. ; Derlon N. ; Morgenroth E. ; Picioreanu C.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 375
结束页码: 387
语种: 英语
英文关键词: Biofilm compression
; Elastic modulus
; Fluid-structural model
; Hydraulic resistance
; Poroelasticity
Scopus关键词: Biofouling
; Computation theory
; Computational methods
; Deformation
; Elastic moduli
; Elastoplasticity
; Hydraulics
; Membranes
; Microfiltration
; Numerical methods
; Numerical models
; Optical tomography
; Stream flow
; Hydraulic resistances
; Irreversible deformation
; Membrane filtration system
; Numerical and experimental study
; Optimal operating conditions
; Poro-elasticity
; Structural modeling
; Viscoelastic and elastoplastic models
; Biofilms
; biofilm
; compression
; elastic modulus
; experimental study
; fluid-structure interaction
; hydraulic property
; numerical method
; permeability
; poroelasticity
; tomography
; ultrafiltration
英文摘要: Biofilm formation in membrane systems negatively impacts the filtration system performances. This study evaluated how biofilm compression driven by permeate flow increases the hydraulic resistance and leads to reduction in permeate flux. We analysed the effect of biofilm compression on hydraulic resistance and permeate flux through computational models supported by experimental data. Biofilms with homogeneous surface structure were subjected to step-wise changes in flux and transmembrane pressure during compression and relaxation tests. Biofilm thickness under applied forces was measured non-invasively in-situ using optical coherence tomography (OCT). A numerical model of poroelasticity, which couples water flow through the biofilm with biofilm mechanics, was developed to correlate the structural deformation with biofilm hydraulics (permeability and resistance). The computational model enabled extracting mechanical and hydrological parameters corresponding to the experimental data. Homogeneous biofilms under elevated compression forces experienced a significant reduction in thickness while only a slight increase in resistance was observed. This shows that hydraulic resistance of homogeneous biofilms was affected more by permeability decrease due to pore closure than by a decrease in thickness. Both viscoelastic and elastoplastic models could describe well the permanent biofilm deformation. However, for biofilms under study, a simpler elastic model could also be used due to the small irreversible deformations. The elastic moduli fitting the measured data were in agreement with other reported values for biofilm under compression. Biofilm stiffening under larger flow-driven compression forces was observed and described numerically by correlating inversely the elastic modulus with biofilm porosity. The importance of this newly developed method lies in estimation of accurate biofilm mechanical parameters to be used in numerical models for both membrane filtration system and biofouling cleaning strategies. Such model can ultimately be used to identify optimal operating conditions for membrane system subjected to biofouling. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112422
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, Delft, HZ 2629, Netherlands; Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, 8600, Switzerland; ETH Zürich, Institute of Environmental Engineering, Zürich, 8093, Switzerland
Recommended Citation:
Jafari M.,Desmond P.,van Loosdrecht M.C.M.,et al. Effect of biofilm structural deformation on hydraulic resistance during ultrafiltration: A numerical and experimental study[J]. Water Research,2018-01-01,145