XIONGPeng-yu,QIANXiao-yong,WANGLi-hua,et al.Measurement of Nitrous Oxide Emission and Localization Factor Determination in a Fully Covered Wastewater Treatment Plant[J].China Water & Wastewater,2024,40(15):28-35.
Measurement of Nitrous Oxide Emission and Localization Factor Determination in a Fully Covered Wastewater Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第15期
Page:
28-35
Column:
Date of publication:
2024-08-01
- Keywords:
- fully covered wastewater treatment plant; N2O emission factor; localization; UNITANK process
- Abstract:
- Accurate quantification of nitrous oxide (N2O) emission is a crucial foundation for research on carbon reduction. Therefore, a fully covered wastewater treatment plant utilizing the UNITANK process in Shanghai was chosen as the study subject for conducting long-term monitoring and comprehensive assessment of N2O emission from four treatment units (inlet pumping station, grit chamber, storage tank, and bioreactor). The nitrogen removal process accounted for 92.94% of N2O emission in the wastewater treatment plant, with an average emission of 0.13 g/m3. The UNITANK process exhibited continuous N2O emissions throughout the year. For seasonal variation, the correlation analysis revealed that N2O emission was associated with water temperature, influent total nitrogen, and total nitrogen removal rate. The diurnal variation of N2O emission might be influenced by water temperature and influent quality, and its peak value was synchronized with water temperature and total nitrogen concentration.The localization factor (EFN2O) for the UNITANK process was calculated to range from 0.07% to 0.425%, which was significantly lower than the default EFN2O value (1.6%) proposed by the Intergovernmental Panel on Climate Change (IPCC). The localization of EFN2O can provide reference for the accurate calculation of N2O emission of wastewater treatment plants in Shanghai and surrounding areas.
Last Update:
2024-08-01