Article

Membrane gas transfer under conditions of creeping flow: modeling gas composition effects.

The Department of Civil Engineering, University of Minnesota, 122 Civil Engineering Building, 500 Pillsbury Drive SE, Minneapolis, MN 55455-0220, USA.
Water Research (impact factor: 4.86). 06/2004; 38(10):2489-98. DOI:10.1016/j.watres.2004.03.011 pp.2489-98
Source: PubMed

ABSTRACT A computational model was developed to predict gas transfer and gas composition changes in membrane modules designed for addition of gases to groundwater. The model was verified using pilot-scale gas transfer experiments. The modeling and experimental results suggest that back diffusion of dissolved gases into the membrane has a significant effect on gas transfer via hollow-fiber membrane. In the experimental study, N(2) back-diffusion reduced the partial pressure of O(2) within the membrane and decreased the concentration gradient for gas transfer. The model was able to simulate both the dynamic and steady-state gas transfer behavior of the membranes under a variety of operating conditions. This model can be used to estimate gas transfer as a function of different membrane module design and operating conditions.

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Keywords

computational model
 
concentration gradient
 
dynamic
 
estimate gas transfer
 
experimental study
 
gas composition changes
 
gas transfer
 
gases
 
groundwater
 
hollow-fiber membrane
 
membrane modules
 
membranes
 
modeling
 
partial pressure
 
pilot-scale gas transfer experiments
 
significant effect
 
steady-state gas transfer behavior