Effectiveness and mechanism of natural attenuation at a petroleum-hydrocarbon contaminated site

Chemosphere
Hang LvMingyao Liu

Abstract

This study applied an integrated method for evaluating the effectiveness and mechanism of natural attenuation (NA) of petroleum-hydrocarbon contaminated groundwater. Site groundwater and soil samples were analysed to characterize spatial and temporal variations in petroleum hydrocarbons, geochemical indicators, microbial diversity and isotopes. The results showed that the area of petroleum hydrocarbon contamination plume decreased almost 60% in four years, indicating the presence of natural attenuation. The 14C content and sequence analysis indicate that there are more relatively 'old' HCO3- that have been produced from petroleum hydrocarbons in the upgradient portion of the contaminated plume, confirming that intrinsic biodegradation was the major factor limiting spread of the contaminated plume. The main degradation mechanisms were identified as sulfate reduction and methanogenesis based on the following: (1) more SO42- have been consumed in the contamination source than downgradient, and the δ34S values in the resident SO42- were also more enriched in the contamination source, (2) production of more CH4 in the contamination source with the δ13C values for CH4 was much lower than that of CO2, and the fractionation factor was ...Continue Reading

Citations

Apr 24, 2020·Environmental Science and Pollution Research International·Yongli GuoHamza Jakada
Jul 28, 2020·The Science of the Total Environment·Sunita VarjaniVivek N Upasani
Jan 12, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Amir Mohaghegh MotlaghHumayra Saba

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