Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (6): 872-876.DOI: 10.12068/j.issn.1005-3026.2018.06.022

• Resources & Civil Engineering • Previous Articles     Next Articles

Characteristics of Partial Nitrification and N2O Emissions Through Aerobic Granular Sludge Treating Livestock Wastewater

ZHANG Ming-chuan, XU Xin-yang, WANG Lin   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2017-01-09 Revised:2017-01-09 Online:2018-06-15 Published:2018-06-22
  • Contact: ZHANG Ming-chuan
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Abstract: Aerobic granular sludge can achieve partial nitrification due to the special anaerobic/aerobic space structure. However, the greenhouse gas N2O could emit through partial nitrification and aerobic granular structure. In this study, performance of partial nitrification in an aerobic granular sludge reactor treating livestock wastewater was investigated, and its characteristics of N2O emissions were quantified by sensitive N2O micro-sensors. In the steady-state, the average COD and ammonium removal rates were 76.8% and 94.4%, respectively. The partial nitrification efficiency reached 88.9%. According to the results of micro-sensors and gas chromatography, the proportion of N2O generation from anaerobic and aerobic stage in the aerobic granular sludge system was 46.4% and 53.6%, respectively, but the N2O emissions from the partial nitrification system were mainly caused by air stripping in aeration phase. The ratio of N2O-N emissions was 2.1% of the influent nitrogen loading from this system. It showed N2O emissions were not significantly enhanced by the aerobic granular sludge.

Key words: aerobic granular sludge, N2O emissions, partial nitrification, livestock wastewater, N2O micro-sensor

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