|
|||||
|
|
Identifying sources of nitrous oxide emission in anoxic/aerobic sequencing batch reactors (A/O SBRs) acclimated in different aeration rates |
|
| Authors: | Hu Zhen Zhang Jian Xie Huijun Li Shanping Zhang Tingting Wang Jinhe |
| Affiliation: | a Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China b Environmental Research Institute, Shandong University, 27 Shanda Nanlu, Jinan 250100, PR China c School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, PR China |
| Abstract: | 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. |
| Keywords: | Nitrous oxide Wastewater treatment Aeration rate DGGE |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ | |