Journal
ENZYME AND MICROBIAL TECHNOLOGY
Volume 49, Issue 2, Pages 237-245Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2011.04.014
Keywords
Nitrous oxide; Wastewater treatment; Aeration rate; DGGE
Categories
Funding
- National Water Special Project [2009ZX07210-009-04]
- Independent Innovation Foundation of Shandong University [2009JQ009]
- National Natural Science Foundation of China [21007032]
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Both long term and batch experiments were carried out to identify the sources of the N2O emission in anoxic/aerobic sequencing batch reactors (A/O SBRs) under different aeration rates. The obtained results showed that aeration rate has an important effect on the N2O emission of A/O SBR and most of the N2O was emitted during the aerobic phase. During the anoxic phase, nitrate ammonification was the major source of N2O emission while denitrification performed as a sink of N2O, in all three bioreactors. The N2O emission mechanisms during the aerobic phase differed with the aeration rate. At low and high aeration rates (Run 1 and Run 3), both coupled-denitrification and nitrifier denitrification were ascribed to be the source of N2O emission. At mild aeration rate (Run 2), nitrifier denitrification by Nitrosomonas-like ammonia oxidizing-bacterial (AOB) was responsible for N2O emission while coupled-denitrification turned out to be a sink of N2O because of the presence of inner anaerobic region in sludge flocs. (C) 2011 Elsevier Inc. All rights reserved.
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