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Browsing by Author Dahan, O.

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  • In Situ Bioremediation of a Gasoline‐Contaminated Vadose Zone: Implications from Direct Observations

    • Authors: Moshkovich, E.;  Advisor: -;  Participants: Ronen, Z.; Gelman, F.; Dahan, O. (2018)

  • In situ bioremediation of a contaminated vadose zone requires implementing hydraulic and chemical conditions that stimulate the development of indigenous bacteria capable of degrading contaminants in the subsurface. We investigated enhanced biostimulation of a gasoline‐contaminated deep vadose zone through nutrient‐ and O2–amended water infiltration. 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 methyl tert‐butyl ether and benzene, toluene, ethylbenzene, and xylene in pore‐water a...
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  • Increased irrigation water salinity enhances nitrate transport to deep unsaturated soil

    • Authors: Weissman, G.;  Advisor: -;  Participants: Bel, G.; Ben‐Gal, A.; Yermiyahu, U.; Alexandrov, B.; Rasmussen, K. Ø.; Dahan, O. (2020)

  • Excessive use of N fertilizers in agriculture often leads to NO3− accumulation in the unsaturated zone and to groundwater pollution. There is uncertainty regarding the variability in fertilizer transport and uptake efficiency due to the lack of studies based on continuous nondestructive measurements in unsaturated soils. In this study, we analyzed solute dynamics across the unsaturated zone underlying cultivated agricultural fields. Commercial crop rotations under four treatments, comprising two N fertilization regimes and two irrigation water salinity levels, were conducted in loess soil in the semiarid climate of the northern Negev Desert, Israel. The impact of the various treatment...