Header menu link for other important links
X
Numerical modeling of particulate fouling and cake-enhanced concentration polarization in roto-dynamic reverse osmosis filtration systems
Published in Elsevier B.V.
2019
Volume: 468
   
Abstract
The decline in permeate flux due to fouling is attributed to the flow resistance offered by cake layer and enhanced concentration polarization. The adverse effects on permeate flux can be negated by increasing the fluid shear over the membrane. Roto-dynamic filtration systems, where a rotating disk over a membrane generates high strain rates, have been previously implemented in the ultra and microfiltration regimes. The present work provides a detailed mathematical description of colloidal fouling and cake-enhanced concentration polarization in cross-flow reverse osmosis (CFRO) systems. The mathematical model is numerically implemented in a commercial Computational Fluid Dynamics (CFD) package by employing several subroutines. The proposed model is able to predict the spatio-temporal variation of permeate flux and cake layer thickness in a CFRO filtration system for the first time, the primary focus being a high shear roto-dynamic RO filtration system. The effects of feed pressure, Reynolds number and foulant properties on the permeate flux and salt rejection are discussed in detail. Eventually, the temporal variation of the performance of a roto-dynamic RO filtration system is compared with that of a channel CFRO filtration system and hence the advantages of employing a roto-dynamic RO filtration system have been highlighted. © 2019 Elsevier B.V.
About the journal
JournalData powered by TypesetDesalination
PublisherData powered by TypesetElsevier B.V.
ISSN00119164
Open AccessNo
Concepts (22)
  •  related image
    Computational fluid dynamics
  •  related image
    Fouling
  •  related image
    Polarization
  •  related image
    Reverse osmosis
  •  related image
    Reynolds number
  •  related image
    Rotating disks
  •  related image
    Shear flow
  •  related image
    Strain rate
  •  related image
    COLLOIDAL FOULING
  •  related image
    CONCENTRATION POLARIZATION
  •  related image
    DYNAMIC FILTRATION
  •  related image
    FILTRATION SYSTEMS
  •  related image
    Mathematical descriptions
  •  related image
    PARTICULATE FOULING
  •  related image
    Spatio-temporal variation
  •  related image
    Temporal variation
  •  related image
    Microfiltration
  •  related image
    Concentration (composition)
  •  related image
    Filtration
  •  related image
    Membrane
  •  related image
    Numerical model
  •  related image
    Particulate matter