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	Pathways of N removal and N2O emission from a one-stage autotrophic N removal process under anaerobic conditions
	Li, Kai1; Fang, Fang1; Wang, Han1; Wang, Chao1; Chen, Youpeng2; Guo, Jinsong2; Wang, Xixi2; Jiang, Fuyang1
	2017-02-16
摘要	To investigate the pathways of nitrogen (N) removal and N2O emission in a one-stage autotrophic N removal process during the non-aeration phase, biofilm from an intermittent aeration sequencing batch biofilm reactor (SBBR) and organic carbon-free synthetic wastewater were applied to two groups of lab-scale batch experiments in anaerobic conditions using a 15N isotopic tracer and specific inhibitors, respectively. Then, the microbial composition of the biofilm was analysed using highthroughput sequencing. The results of the N-15 isotopic experiments showed that anaerobic ammonium oxidation (Anammox) was the main pathway of N transformation under anaerobic conditions and was responsible for 83-92% of N-2 production within 24 h. Furthermore, experiments using specific inhibitors revealed that when nitrite was the main N source under anaerobic conditions, N2O emissions from heterotrophic denitrification (HD) and ammonia-oxidizing bacteria (AOB) denitrification were 64% and 36%, respectively. Finally, analysing the microbial composition demonstrated that Proteobacteria, Planctomycetes, and Nitrospirae were the dominant microbes, corresponding to 21%, 13%, and 7% of the microbial community, respectively, and were probably responsible for HD, Anammox, and AOB denitrification, respectively.
DOI	10.1038/srep42072
URL	查看原文
发表期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
卷号	7页码:10
通讯作者	Fang, F (reprint author), Chongqing Univ, Key Lab Gorges Reservoir Reg Ecoenvironm MOE 3, Chongqing 400045, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000394218400001
语种	英语