Hollow fiber membrane degassing in ultrapure water and microbiocontamination

Debabrata Bhaumik, Sudipto Majumdar, Qiuxi Fan, Kamalesh K. Sirkar

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


To eliminate bacterial contamination in the production of ultrapure water (UPW), an advanced oxidation process (AOP) destroys bacteria via the use of H2O2, O3 and/or UV light. To remove the AOP byproducts like CO2, O2, etc. from the treated water, membrane degasification is utilized to achieve near complete removal of dissolved gases, CO2, O2, from deionized water. A small and compact membrane module, commercially available as a blood oxygenator and made out of porous hydrophobic polypropylene (PP) hollow fibers, has yielded excellent degasification. Feed water was in crossflow on the shell side; a vacuum was used on the tube side. To protect the fibers against residual/trace oxidative agents in water, the hollow fibers were coated on the outside with an ultrathin coating of PDD-TFE (perfluorodimethyldioxole-tetrafluoroethylene). Two N2-consuming bacterial strains were grown on a flat porous PP membrane (Celgard 2400) as well as on the PDD-TFE coated hollow fibers. Bacterial adhesion lowered the degassing capabilities of the flat membrane as well as the coated hollow fibers. The mass transfer coefficient in the hollow fiber module has been characterized vis-a-vis the flow rate dependence.

Original languageEnglish (US)
Pages (from-to)31-41
Number of pages11
JournalJournal of Membrane Science
Issue number1-2
StatePublished - Jun 1 2004

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation


  • Composite membranes
  • Fiber membranes
  • Fouling
  • Membrane degassing
  • Ultrapure water


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