Assessing the microbial communities inhabiting drinking water networks and nitrifying enrichments with special respect on nitrifying microorganisms

Zsuzsanna Nagymáté, Katalin Nemes-Barnás, Gergely Krett, Károly Márialigeti

Research output: Contribution to journalArticle


This study provides a comprehensive microbiological survey of three drinking water networks applying different water treatment processes. Variability of microbial communities was assessed by cultivation-based [nitrifying, denitrifying most probable number (MPN) heterotrophic plate count] and sequence-aided terminal restriction fragment length polymorphism (T-RFLP) analysis. The effect of microbial community composition on nitrifying MPN values was revealed. The non-treated well water samples showed remarkable differences to their corresponding distribution systems regarding low plate count, nitrifying MPN, and the composition of microbial communities, which increased and changed, respectively, in distribution systems. Environmental factors, such as pH, total inorganic nitrogen content (ammonium and nitrite concentration), and chlorine dioxide treatment had effect on microbial community compositions. The revealed heterogeneous nitrifying population achieved remarkable nitrification, which occurred at low ammonium concentration (14-51 μM) and slightly alkaline pH 7.7-7.9 in chlorine dioxide disinfected water networks. No change was observed in nitrification-generated nitrate concentration, although nitratereducing (and denitrifying) bacteria were present with low MPN and characterized by sequence-aided T-RFLP. The community structures of water samples partially changed in nitrifying enrichments and had influence on the generated nitrifying, especially nitrite-oxidizing MPN regarding the facilitated growth of nitrate-reducing bacteria and even methanogenic archaea beside ammonia-oxidizing microorganisms and nitrite-oxidizing bacteria.

Original languageEnglish
Pages (from-to)361-385
Number of pages25
JournalActa microbiologica et immunologica Hungarica
Issue number3
Publication statusPublished - Aug 2018


  • Ammonia-oxidizing archaea
  • Ammonia-oxidizing bacteria
  • Drinking water
  • Nitrification
  • Sequence-aided T-RFLP

ASJC Scopus subject areas

  • Immunology and Microbiology(all)

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