Journal
WATER RESEARCH
Volume 142, Issue -, Pages 147-158Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.05.048
Keywords
Anammox; Granular sludge size; Low-ammonium sewage treatment; Abundance; Microbial mechanism; N2O emission
Funding
- National Natural Science Foundation of China [41671471, 41322012, 21707155]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB15020303]
- National Key RD Program [2016YFA0602303]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01Z176]
- special fund from the State Key Joint Laboratory of Environment Simulation and Pollution Control (Research Center for Eco-environmental Sciences, Chinese Academy of Sciences) [18Z02ESPCR]
- Open Research Fund of Key Laboratory of Drinking Water Science and Technology, Chinese Academy of Sciences [16Z03KLDWST]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Humboldt Research Fellowship [1152633]
- Program of the Youth Innovation Promotion Association (CAS)
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An integrated investigation to document high anammox abundance, activity and diversity in upfiow anaerobic sludge blanket (UASB) reactor treating low-strength ammonium loading sewage was performed and showed that the optimal anammox granular sludge sizes could mitigate undesirable N2O emission. The enhanced anammox bacterial abundance, activity and specific anammox rate were achieved with optimal granules sludge sizes of 0.5-0.9 mm with multiple Jettenia, Brocadia, and Anammoxoglobus species. The tightly-bound extracellular polymeric substance (TB-EPS) was the main EPS layer found in anammox granular sludge, in which polysaccharides play an important structural role. Over this granular sludge sizes, the anammox bacterial abundance and activity did not significantly decrease, but N2O emission significantly increased. High throughput sequencing and ecological networks demonstrated the patterns of anammox and their co-occurring bacteria, with availability N2O-producer and N2O-reducer functional genes. Incomplete denitrification and insufficient carbon source mainly contributed to N2O production in granular sludge, as supported by results of stratification analysis. (C) 2018 Elsevier Ltd. All rights reserved.
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