文献类型：期刊文献

英文题名：Flocs are the main source of nitrous oxide in a high-rate anammox granular sludge reactor: insights from metagenomics and fed-batch experiments

作者：Zhuang, Jin-long[1,2];Zhou, Yuan-yuan[1,2];Liu, Yong-di[1,2,3];Li, Wei[1,2,3]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Sch Resources & Environm Engn, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Sch Resources & Environm Engn, Shanghai, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai, Peoples R China

年份：2020

卷号：186

外文期刊名：WATER RESEARCH

收录：;EI(收录号：20203509105555);WOS:【SCI-EXPANDED(收录号:WOS:000589968500011)】；

基金：This work was supported by National Natural Science Foundation of China (51808223), Fundamental Research Funds for the Central Universities (JKB012014053, 50321022017009 National Key Research and Development Program of China (2019YFC0408202), Shanghai Educational Development Foundation (18CG34), Shanghai Rising-Star Program (20QC1400500).

语种：英文

外文关键词：Anammox; Flocs; Nitric oxide; Nitrous oxide emission; Metagenomic

摘要：Nitrous oxide (N2O) emissions from anammox-based processes are well documented but insight into source of the N2O emission in high-rate anammox granular sludge reactors (AGSR) is limited. In this study, metagenomics and fed-batch experiments were applied to investigate the relative contributions of anammox granules and flocs to N2O production in a high-rate AGSR. Flocs, which constitute only similar to 10% of total biomass contributed about 60% of the total N2O production. Granules, the main contributor of nitrogen removal (-95%), were responsible for the remaining similar to 40% of N2O production. This result is in-consistent with reads-based analysis that found the gene encoding clade II type nitrous oxide reductase (nosZ(II)) had similar abundances in both granules and flocs. Another notable trend observed was the relatively higher abundance of the gene for NO-producing nitrite reductase (nir) in comparison to the gene for the nitric oxide reductase gene ( nor ) in both granules and flocs, indicating nitric oxide (NO) may accumulate in the AGSR. This is significant since NO and N2O pulse assays demonstrated that NO could lead to N2O production from both granules and flocs. However, since anammox bacteria, which were shown to be in higher abundance in granules than in flocs, have the capacity to scavenge NO this provides a mechanism by which its inhibitory effects can be mitigated, limiting N2O release from the granules, consistent with experimental observation. These results demonstrate flocs are the main source of N2O emission in AGSR and provide lab-scale evidence that NO-dependent anammox can mitigate N2O emission. (c) 2020 Elsevier Ltd. All rights reserved.