Effect of operational modes on nitrogen removal and nitrous oxide emission in the process of simultaneous nitrification and denitrification
| Autor: | Pingxiao Wu, Mengsi Chen, Zhiqiang Hu, Jinhua Wu, Fang Zhang, Penchi Chiang, Nengwu Zhu, Ping Li |
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| Rok vydání: | 2015 |
| Předmět: |
Denitrification
Chemistry General Chemical Engineering Inorganic chemistry General Chemistry Mesorhizobium sp Nitrous oxide equipment and supplies Simultaneous nitrification-denitrification Nitrogen removal Industrial and Manufacturing Engineering chemistry.chemical_compound Environmental chemistry Total nitrogen Nitrosomonas sp Environmental Chemistry Sewage treatment |
| Zdroj: | Chemical Engineering Journal. 280:549-557 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2015.06.016 |
| Popis: | The effects of operational modes (fully aerobic mode and anoxic–aerobic mode) on simultaneous nitrification and denitrification (SND) process were investigated to reveal the different characteristics of nitrogen removal and nitrous oxide (N2O) emission. Results indicated that total nitrogen (TN) removal and SND efficiencies under anoxic–aerobic mode increased by 17.8% and 10.1% in comparison with fully aerobic mode. Furthermore, N2O emission in the anoxic–aerobic SND was much lower than in fully aerobic SND. The amount of N2O emitted per cycle in the fully aerobic SND was 21.9 ± 7.1% of the removed TN, which was three times higher than 7.0 ± 1.6% observed in the anoxic–aerobic SND. Denitrification by nitrifiers was the main source of N2O emission in both systems. High-throughput pyrosequencing analysis revealed a greater abundance of Nitrosomonas sp. and Mesorhizobium sp. in fully aerobic SND than anoxic–aerobic SND, which were closely associated with N2O emissions. |
| Databáze: | OpenAIRE |
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