Hydrogen-based hollow-fiber membrane biofilm reactor (MBfR) for removing oxidized contaminants

B. E. Rittmann, R. Nerenberg, K. C. Lee, I. Najm, T. E. Gillogly, G. E. Lehman, S. S. Adham

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

Research with a laboratory prototype and at the pilot scale documents that the hydrogen-based hollow-fiber Membrane-Biofilm Reactor (MBfR) is technically and economically feasible for reduction of nitrate and perchlorate. In the MBfR, H2 gas diffuses through the wall of a composite membrane, and an autotrophic biofilm naturally develops on the outside of the membrane, where the bacteria's electron acceptor is an oxidized contaminant (e.g., NO 3- or ClO4-) supplied from the water. The hydrogen pressure to the hollow fibers is a key control parameter that can be adjusted rapidly and easily. For denitrification, partial nitrate removal often is acceptable, and the hydrogen pressure can be low to minimize the costs of H2 supply and the concentration of H2 in the effluent. When perchlorate must be reduced, full nitrate removal is essential, since NO3--N above about 0.2 mg/L slows perchlorate reduction. Perchlorate reduction is sensitive to the hydrogen pressure, which underscores the critical role of H2 pressure for controlling process performance. Given that H2-oxidizing microorganisms have the potential to reduce many oxidized contaminants, we hypothesize that and are beginning to test how well the MBfR reduces bromate, selenate, chlorinated solvents, and other oxidized contaminants.

Original languageEnglish (US)
Pages (from-to)127-133
Number of pages7
JournalWater Science and Technology: Water Supply
Volume4
Issue number1
DOIs
StatePublished - 2004
Externally publishedYes

Keywords

  • Biofilm, denitrification
  • Hollow-fiber membrane
  • Hydrogen reduction
  • Oxidized contaminants
  • Perchlorate reduction
  • Water treatment

ASJC Scopus subject areas

  • Water Science and Technology

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