Evaluation of the Bacteria Effects on the Geotechnical Properties of Clay Soil Contaminated with Crude Oil

Authors

1 M.Sc. of Geotechnical Engineering, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

2 Associate Professor, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

Abstract

Soil pollution caused by crude oil is one of the important issues in environmental geotechnics. Especially, this type of pollution can be observed in the soil layers of oil-rich areas where oil transmission pipes are located due to the leakage of oil materials. Although the type of soil (granular or fine) is effective in the development of pollution caused by crude oil. Today, various modern methods are used to remove hydrocarbon pollutants, one of which is the use of biological materials. The main propose of present research is evaluate the effect of bacteria application on the geotechnical properties of clayey soil contaminated with crude oil. For this aim, first crude oil is mixed with clay at the rate of 1, 3 and 5 percent by weight. Then, JQ963328.1 bacteria was added to the contaminated soil and cured for 30 days. For evaluating geotechnical properties of improved soil standard compaction, uniaxial compressive strength, direct shear test and consolidation tests have been performed. The results of present study show that with the increase in the presence of crude oil in clay, the bearing capacity has decreased and the amount of swelling and settlement has increased. On the other hand, by mixing bacteria with clay containing 5% crude oil and after curing, it was observed that the uniaxial compressive strength by 33%, the shear strength by 9.8% increased respectively. The swelling potential decreased by 23%.

Keywords

New Findings in Applied Geology

Articles in Press, Accepted Manuscript
Available Online from 08 April 2024

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History

  • Receive Date: 12 December 2023
  • Revise Date: 01 April 2024
  • Accept Date: 08 April 2024

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