title: Membrane gas transfer under conditions of creeping flow: modeling gas composition effects.
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.
authors.affiliation: The Department of Civil Engineering, University of Minnesota, 122 Civil Engineering Building, 500 Pillsbury Drive SE, Minneapolis, MN 55455-0220, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Fang
authors.forename: L W
authors.initials: LW
authors.lastname: Clapp
authors.forename: R M
authors.initials: RM
authors.lastname: Hozalski
authors.forename: P J
authors.initials: PJ
authors.lastname: Novak
authors.forename: M J
authors.initials: MJ
authors.lastname: Semmens
mesh_terms: D004867:Equipment Design; D005740:Gases / Q000737:chemistry*; D006859:Hydrogen / Q000032:analysis; D008433:Mathematics; D008567:Membranes, Artificial; D008954:Models, Biological; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*; D014881:Water Supply
chemical_list: D005740:Gases; D008567:Membranes, Artificial; D006859:Hydrogen; D009584:Nitrogen; D010100:Oxygen