Denitrifying capabilities of ⁢Tetrasphaera⁢ and their contribution towards nitrous oxide production in enhanced biological phosphorus removal processes

WATER RESEARCH

卷:137

Article

Marques, Ricardo¹  Ribera-Guardia, Anna²  Santos, Jorge¹  Carvalho, Gilda¹  Reis, Maria A. M.¹  Pijuan, Maite²  Oehmen, Adrian¹ 

[1] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Quim, UCIBIO,REQUIMTE, Campus Caparica, P-2829516 Caparica, Portugal

[2] Univ Girona, ICRA, Parc Cient & Tecnol, Girona 17003, Spain

关键词: Tetrasphaem-related bacteria;    Polyphosphate accumulating organisms (PAO);    Enhanced biological phosphorus removal (EBPR);    Denitrification;    Nitrous oxide (N2O);    Electron competition;   

DOI  :  10.1016/j.watres.2018.03.010

来源: Elsevier

【 摘 要 】

Denitrifying enhanced biological phosphorus removal (EBPR) systems can be an efficient means of removing phosphate (P) and nitrate (NO3-) with low carbon source and oxygen requirements. Tetrasphaera is one of the most abundant polyphosphate accumulating organisms present in EBPR systems, but their capacity to achieve denitrifying EBPR has not previously been determined. An enriched Tetrasphaera culture, comprising over 80% of the bacterial biovolume was obtained in this work. Despite the denitrification capacity of Tetrasphaera, this culture achieved only low levels of anoxic P-uptake. Batch tests with different combinations of NO3-, nitrite (NO2-) and nitrous oxide (N2O) revealed lower N2O accumulation by Tetrasphaera as compared to Accumulibacter and Competibacter when multiple electron acceptors were added. Electron competition was observed during the addition of multiple nitrogen electron acceptors species, where P uptake appeared to be slightly favoured over glycogen production in these situations. This study increases our understanding of the role of Tetrasphaera-related organisms in denitrifying EBPR systems. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free