| Title | Role of sludge retention time in mitigation of nitrous oxide emission from a pilot-scale oxidation ditch |
| Authors | Zhou, Nan Dang, Chenyuan Zhao, Zhirong He, Shishi Zheng, Maosheng Liu, Wen Wang, Xiangke |
| Affiliation | North China Elect Power Univ, MOE Key Lab Reg Energy Syst Optimizat, Environm Res Acad, Beijing 102206, Peoples R China Peking Univ, Dept Environm Engn, Key Lab Water & Sediment Sci, Minist Educ, Beijing 100871, Peoples R China |
| Keywords | Nitrous oxide Oxidation ditch Sludge retention time Hydraulic retention time Ammonia overload shock |
| Issue Date | 2019 |
| Publisher | BIORESOURCE TECHNOLOGY |
| Abstract | Nitrous oxide (N2O) emission from wastewater treatment plants (WWTPs) has become a focus of attention due to its significant greenhouse effect. In this study, the role of sludge retention time (SRT) in mitigation of N2O emission from a pilot-scale oxidation ditch was systematically investigated. The activated sludge system that operated at SRT of 25 days demonstrated significantly lower N2O emission factor, higher resistance to ammonia overload and aeration failure shock than those obtained at SRT of 15 days no matter which hydraulic retention time (HRT) was adopted. Batch experiments revealed that nitrifier denitrification (ND) was the primary mechanism of N2O generation. However, more microbes affiliated with Nitrospira genera were harbored in the system at SRT 25 d, which could effectively avoid nitrite accumulation, a key factor promoting N2O generation by ND. PICRUSt results further suggested the system at SRT 25 d possessed higher genetic potential for N2O reduction reflected by the more abundant nitrous-oxide reductase. |
| URI | http://hdl.handle.net/20.500.11897/544685 |
| ISSN | 0960-8524 |
| DOI | 10.1016/j.biortech.2019.121961 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 环境科学与工程学院 水沙科学教育部重点实验室（联合） |
