Abstract

The H 2-based membrane biofilm reactor was used to remove nitrate from synthetic ion-exchange brine at NaCl concentrations from ∼3 to 30 g/L. NaCl concentrations below 20 g/L did not affect the nitrate removal flux as long as potassium was available to generate osmotic tolerance for high sodium, the H 2 pressure was adequate, and membrane fouling was eliminated. Operating pHs of 7-8 and periodic citric acid washes controlled membrane fouling and enabled reactor operation for 650 days. At 30 psig H 2 and high nitrate loading rates of 15 to 80 g/m 2 d, nitrate removal fluxes ranged from 2.5 to ∼6 g/m 2 d, which are the highest fluxes observed when treating 30 g/L IX brine. However, percent removals were low, and the H 2 pressure probably limited the removal flux.

Original languageEnglish (US)
Pages (from-to)100-104
Number of pages5
JournalWater Science and Technology
Volume65
Issue number1
DOIs
StatePublished - Jan 20 2012

Keywords

  • Flux
  • Membrane biofilm reactor
  • NaCl
  • Nitrate removal

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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