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Physical Modeling of Bioremediation of Gasoline Spill in the Vadose Zone

Rahimi, Behnam | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55658 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadeghi, Hamed; Moghimi, Hamid
  7. Abstract:
  8. Oil pollutants are among the important sources of pollution in countries with oil and gas industries such as Iran. Soil pollution by these pollutants is one of the environmental issues and hazards. All kinds of organic and inorganic pollutants in the soil may penetrate the underground water or enter the atmosphere in the form of gas, which respectively enters the food chain through absorption by plants or enter the body of living organisms through breathing. They include humans, which are a threat to the health and life of living beings. For example, many of these pollutions cause diseases such as cancer, suppression of the body's immune system, or even obesity; therefore, it is necessary to eliminate or reduce these pollutants to the minimum possible level. For this purpose, various chemical, physical and biological methods have been proposed to remove pollutants, but biological methods have attracted the most attention in recent years since they are economical and more importantly, they are environmentally friendly. The purpose of this research is to investigate the effect of using different methods in improving the bioremediation process. In this study, this issue was investigated with the help of one-dimensional physical modeling of the soil column. Diesel has been used as a light non-aqueous liquid phase (LNAPL) petroleum pollutant, which, due to its low density, penetrates the groundwater level after spillage and remains in the unsaturated zone. To improve the conditions for microbial growth and as a result to increase biodegradation, natural adsorbent biochar and aeration have been used. The results of this research show the positive effect of aeration and biochar in the biorefining process. The combination of biological stimulation methods with the addition of biochar and aeration to provide oxygen to the microorganisms could remove 82% of pollutants. Also, changes in the rate of pollutant biodegradation in-depth have been investigated. With increasing depth, the rate of biodegradation for biostimulation, biostimulation with biochar, and the combination of this method with aeration decreased by 53.7, 35.7, and 1.20, respectively. Considering environmental conditions also increased the amount of pollutant reduction in all samples
  9. Keywords:
  10. Bioremediation ; Aeration ; Unsaturated Soil ; Oil Pollution ; Nonaqueous Phase Liquid (NAPL) ; Biochar ; Biostimulation ; Soil Contamination

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