Details of the abstract
Title of paper |
Time-lapse geophysical 3-D modeling of used engine oil contamination |
List of authors | MOHAMMED NAZIFI H.1, GÜLEN L.1, E. GÜRBÜZ E. 1 and PEKŞEN E. 2 |
Affiliation(s) |
1Geophysics Engineering Department, Sakarya University, Turkey, 2Geophysics Engineering Department, Kocaeli University, Turkey, |
Summary | Used engine oil (UEO) is one of the most important soil contaminants in urban areas. As a light non-aqueous phase liquid (LNAPL), UEO tend to accumulate above and slightly below the water table. UEO does not easily evaporate from soil and does not dissolve in water, although some of its chemical additives do dissolve in water. The hydrocarbon components of UEO remain in the soil for a long time. Health risk and livelihood burdens caused by UEO contamination include neurological disorders, blindness, depression, and convulsions in livestock. Toxins from UEO can accumulate in tiny organisms at the base of the food chain and eventually reach humans, thereby adversely affecting human health. To monitor, characterize, and map UEO contamination in a laboratory setting, a semi-continuous contamination experiment was simulated over a five-week period. The experimental setup was contaminated with 2 liters of UEO once a week for four weeks, resulting in a total of 8 liters of UEO contamination. Time-lapse ground-penetrating radar (GPR) and electrical resistivity tomography (ERT) methods were used in the experiment. GPR data was collected with a 2.0 GHz antenna, while ERT data was collected with a specially designed 24-electrode miniature array. The experimental results showed a progressive increase in both the GPR signals and the electrical resistivity over time. The geophysical responses revealed by the semi-continuous contamination experiment were explained by physical property contrasts between the UEO and the aquifer system. Our results confirm the results of previous studies that investigated LNAPL contamination for short periods of time. These experimental results prove that geophysical time-lapse GPR and time-lapse ERT methods can be used successfully in 3-D modeling of UEO contamination. |
Session Keyword | 3.0 Exploration, Monitoring and Hazards |
File upload |
3.0_time-lapse_geophysical_3-_mohammed nazifi.pdf
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