INVESTIGATION ON THE DYNAMIC ENVIRONMENTAL BEHAVIOUR OF PETROLEUM-DERIVED POLYCYCLIC AROMATIC HYDROCARBONS IN AN OILFIELD, CHINA

摘要

Between 1976 and 2015, dynamic environmental behaviour of 16 polycyclic aromatic hydrocarbons (PAHs) in a Chinese oilfield was investigated using a level IV fuga-city model. The modified model demonstrated better agreement with measured values, with average residual errors of 0.45, 0.70, 0.74, and 0.79 logarithmic units for air, water, soil, and sediment, respectively. The PAH concentrations in each compartment were reduced by 83.57, 54.32, 98.98, and 88.97% between 1976 and 2011. Source emission in soil was confirmed as the leading input in the oilfield, while degradation in soil was the major output. The dominant transfer process was volatilization and wind re-suspension from soil to air. Soil was identified as the main sink during 1976-2015. The ring size distribution indicated that compounds containing more than four rings were dominant in air, two- and three-ring compounds were prevalent in water, three ring compounds were mainly in soil, and four-ring compounds were predominant in sediment. A sensitivity analysis revealed that the octanol-water partition coefficient (logK_(ow)) was the most sensitive parameter for adjusting the uncertainties.