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Sci Total Environ. 2019 Jan 10;647:1188-1198. doi: 10.1016/j.scitotenv.2018.08.098. Epub 2018 Aug 7.

Start up of partial nitritation-anammox process using intermittently aerated sequencing batch reactor: Performance and microbial community dynamics.

Author information

1
Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland.
2
Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environment, Yangtze Delta Region Institute of Tsinghua University, Zhejiang Province, China. Electronic address: liuruitsinghuazj@gmail.com.
3
Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environment, Yangtze Delta Region Institute of Tsinghua University, Zhejiang Province, China.
4
School of Environment, Tsinghua University, Beijing, China.
5
Institute of Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
6
Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China.
7
Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland; Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China. Electronic address: xinmin.zhan@nuigalway.ie.

Abstract

This study investigated the performance and microbial community dynamics of a start-up method for the partial nitritation-anammox (PN-A) process: start-up from return sludge in an intermittently aerated sequencing batch reactor (IASBR). The robustness of this PN-A IASBR system in achieving long-term efficient nitrogen removal was also investigated. Stable partial nitritation with nitrite accumulation ratio of about 80% was firstly achieved in the IASBR. Then, PN-A process with total nitrogen removal of up to 81.5% was established due to the thriving of anammox bacteria Candidatus Kuenenia resulting from the reduction of the aeration rate. Molecular analysis showed that both bacterial and archaeal communities shifted greatly throughout the start-up stage and the PN-A stage. Besides bacterial genus Nitrosomonas, ammonium-oxidizing archaea (AOA) Candidatus Nitrososphaera with a high abundance of 3.44% also contributed to partial nitritation. Nitrospira was effectively restrained (abundance <1.6%) while methanogens co-existed with the aerobic and anaerobic nitrogen-conversion microorganisms. This study showed that IASBR configuration was efficient in starting up the PN-A process from return sludge, maintaining long-term efficient nitrogen removal and triggering the thrive of AOA.

KEYWORDS:

Ammonium oxidizing archaea; Anammox; Intermittently aerated SBR; Microbial community; Partial nitritation

PMID:
30180327
DOI:
10.1016/j.scitotenv.2018.08.098
[Indexed for MEDLINE]

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