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Detritiation of water using microporous hollow‐fiber membranes
Author(s) -
Kelso Robert C.,
Ahmed Tariq,
Middlebrooks E. Joe
Publication year - 1997
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143097x125335
Subject(s) - microporous material , mass transfer , membrane , mass transfer coefficient , fiber , countercurrent exchange , tritiated water , chemistry , stripping (fiber) , materials science , hollow fiber membrane , dimensionless quantity , porosity , analytical chemistry (journal) , chemical engineering , chromatography , tritium , composite material , thermodynamics , nuclear physics , biochemistry , physics , engineering
A novel concept of tritium (HTO) removal with microporous hollow fiber membranes was evaluated in this study. Small‐scale laboratory modules were constructed and tested to determine the mass transfer characteristics of the hollow fibers under varying system parameters. Tritiated water is pumped through the fiber lumen and air, saturated with water vapor, is pumped over the exterior of the fibers in a countercurrent mode. The high HTO concentration gradient encourages the HTO to diffuse across the porous membrane wall, and to transfer directly into the saturated air stream. A dimensionless mathematical correlation that predicts the tritium transfer coefficient across the membranes is presented for parallel flow modules. The measured overall mass transfer coefficients in the membrane module are two to three orders of magnitude greater than those of conventional bubble stripping. In addition, factors that influence the mass transfer performance of the membrane modules in practical applications are evaluated. The results indicate that very low concentrations of HTO can be separated from water using microporous hollow fiber membranes.