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IN SITU BIOREMEDIATION OF A GASOLINE-CONTAMINATED VADOSE ZONE: IMPLICATIONS FROM DIRECT OBSERVATIONS
Moshkovich, E., Z. Ronen, F. Gelman, and O. Dahan.
Vadose Zone Journal 17(1):(2018)

Enhanced biostimulation of indigenous bacteria through infiltration of nutrient- and O2-amended water in a gasoline-contaminated deep vadose zone was observed at a gas station affected by underground storage tank leakage in the city of Tel Aviv, Israel. A vadose zone monitoring system (VMS) provided real-time observations of the treatment process's effect on hydrocarbon attenuation. The VMS data included continuous measurements of variations in water content, concentrations and isotopic compositions of MTBE and BTEX in pore-water and gas phases, and concentrations of O2 and CO2 in the vadose zone gas phase. Real-time observations from the unsaturated zone enabled interactive adjustment of the remediation strategy and improved biostimulation conditions for biodegradation of the target compounds. In the course of three infiltration events of an O2- and nutrient-enriched water solution, a significant reduction in contaminant mass was observed across the unsaturated zone. This paper is Open Access at https://dl.sciencesocieties.org/publications/vzj/abstracts/17/1/170153.



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