Diurnal Variation of Greenhouse Gas Emission from Petrochemical Wastewater Treatment Processes Using In-situ Continuous Monitoring System and the Associated Effect on Emission Factor Estimation

Wen-Bin Yang ； Chung-Shin Yuan ； Wei-Hsiang Chen ； Ying-Hsien Yang ； Chung-Hsuang Hung

《Aerosol and Air Quality Research》 17卷10期 (2017/10) Pp. 2608-2623

https://doi.org/10.4209/aaqr.2017.08.0276

摘要

The temporal variation of greenhouse gas (GHG) emission in a petrochemical wastewater treatment plant (WWTP) was investigated in this study. Two approaches including an in-situ continuous monitoring and a typical grab sampling methods were also compared. The in-situ continuous monitoring method provided more detailed information regarding the temporal variations of GHG concentrations. A sufficient sampling frequency (e.g., once every 6 hours) for the grab sampling method is required to effectively resolve the diurnal variations of GHG concentrations. This study highlights significant diurnal variations of GHG concentrations in different wastewater treatment units. Only with proper and reliable sampling and analytical methods, it becomes possible to correctly identify the characteristics of GHG emissions and to develop strategies to curtail the GHG emissions from such an important source in response to regulatory measures and international treaties. This study revealed that N_2O was the dominant species responsible for GHG emissions in the WWTP and the emission factors of CH_4 and N_2O were higher in the equalization tank and final sedimentation tank compared to other units. We further compared the GHG emission factors of this study with other literatures, showing that the GHG emission factors were lower than those measured in Netherlands, Australia, and IPCC, but similar to those measured in Japan.

關鍵字

Greenhouse gas ； Wastewater treatment ； In-situ continuous measurement ； Grab sampling method ； Diurnal variation ； Emission factor