Microbial population in a hydrogen-dependent denitrification reactor

Szilvia Szekeres, Istvan Kiss, Miklos Kalman, M. Inês M. Soares

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The bacterial population in an H2-dependent denitrification system was studied. The laboratory set-up was designed for the treatment of potable water and consisted of an electrochemical cell, where the water to be treated was enriched with H2 prior to entering a bioreactor. Bioreactors (columns packed with granulated active carbon) were inoculated with denitrifying bacterial strains isolated from a previous reactor, then sampled immediately after inoculation, or after 1 or 3 months of continuous operation. Total number of the bacteria and numbers of each different strain were determined at various levels of the bioreactor. The strains present in the inoculum were identified as Ochrobactrum anthropi, Pseudomonas stutzeri, Paracoccus panthotrophus and Paracoccus denitrificans. Numbers of the latter declined markedly with time with the other three strains being responsible for nitrate removal. A correlation was found between the relative abundance of each strain and its specific denitrification activity.

Original languageEnglish
Pages (from-to)4088-4094
Number of pages7
JournalWater Research
Issue number16
Publication statusPublished - Sep 2002



  • Bacteria
  • Biological denitrification
  • Drinking water
  • Hydrogen
  • Water treatment

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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