Hydrogen-dependent denitrification: Preliminary assessment of two bio-electrochemical systems

I. Kiss, S. Szekeres, T. T. Bejerano, M. I.M. Soares

Research output: Contribution to journalConference articlepeer-review

21 Scopus citations


An autotropic biological process for the treatment of nitrate-contaminated drinking water was studied in the laboratory, with the objective of developing a continuous system which would be simple, stable and amenable to upscaling. Hydrogen generated by electrolysis of the water to be treated was the source of energy for denitrifying microorganisms. Two main process configurations were compared: (1) a single reactor where both the generation of hydrogen and denitrification took place, and (2) a two-reactor system where water was first enriched with hydrogen in an electrolysis cell prior to entering a packed-bed bioreactor. The reactors were operated in a continuous mode and granulated activated carbon served as physical support for the biomass. Although the highest rates of denitrification (0.45 kg N m-3 d-1) and the shortest residence times (removal of 18 mg N l-1 in 17 min) were obtained in the single-reactor system, the two-reactor system was more stable and more suitable for upscaling.

Original languageEnglish
Pages (from-to)373-379
Number of pages7
JournalWater Science and Technology
Issue number1-2
StatePublished - 1 Jan 2000
EventProceedings of the 7th International Conference of the Israel Society for Ecology and Environmental Quality Sciences - Jerusalem, Isr
Duration: 13 Jun 199918 Jun 1999


  • Denitrification
  • Hydrogen
  • Water electrolysis
  • Water treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology


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