Microbial population in a hydrogen-dependent denitrification reactor

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

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    86 Scopus citations


    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
    StatePublished - 1 Jan 2002


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

    ASJC Scopus subject areas

    • Water Science and Technology
    • Ecological Modeling
    • Pollution
    • Waste Management and Disposal
    • Environmental Engineering
    • Civil and Structural Engineering


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