Distinctive denitrifying capabilities lead to differences in N2O production by denitrifying polyphosphate accumulating organisms and denitrifying glycogen accumulating organisms

Anna Ribera-Guardia, Ricardo Marques, Corrado Arangio, Monica Carvalheira, Adrian Oehmen, Maite Pijuan

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

This study aims at investigating the denitrification kinetics in two separate enriched cultures of denitrifying polyphosphate accumulating organisms (dPAO) and denitrifying glycogen accumulating organisms (dGAO) and compare their N2O accumulation potential under different conditions. Two sequencing batch reactors were inoculated to develop dPAO and dGAO enriched microbial communities separately. Seven batch tests with different combinations of electron acceptors (nitrate, nitrite and/or nitrous oxide) were carried out with the enriched biomass from both reactors. Results indicate that in almost all batch tests, N2O accumulated for both cultures, however dPAOs showed a higher denitrification capacity compared to dGAOs due to their higher nitrogen oxides reduction rates. Additionally, the effect of the simultaneous presence of several electron acceptors in the reduction rates of the different nitrogen oxides was also assessed in dPAOs and dGAOs.

Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalBioresource Technology
Volume219
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • Denitrification
  • dGAO
  • dPAO
  • Multiple electron acceptors
  • Nitrous oxide

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