Investigation of Biochar and Zeoplant Application on Mechanical Properties of Soils Contaminated with Total Petroleum

Document Type : Research Paper

Authors

1 MSc. of Soil Science Dept., Faculty of Agriculture, Shahid Chamran University of Ahvaz, Iran

2 Assistant Professor of Soil Science Dept., Faculty of Agriculture, Shahid Chamran University of Ahvaz, Iran

Abstract

Exploitation of oil reservoirs enhances the seepage of petroleum hydrocarbon contaminants to the soil. This phenomenon causes environmental damages and detrimental changes in soil chemical, physical, mechanical, and biological properties. In this study, effects of Bagasse biochar and zeoplant as organic-mineral amendments were investigated on some oil-contaminated soils around Ahvaz city (exploitation area of Karoon oil and gas). Soil sampling was carried out using completely randomized in the block, then, the soil samples were put in pots (7 kg) and the treatments were applied at rates of 2%, 4%, and 6% by weight. Afterwards, the soil moisture was adjusted in the pots (25% and 50% of FC) and all samples were incubated for 100 days. After incubation, penetration resistance, tensile strength, and shear strength were measured using the standard methods. Also, Alkanes and total petroleum hydrocarbons (TPHs)were determined using Gas Chromatography (GC). Results revealed that application of biochar and zeoplant at 2% and 4% levels enhanced the shear strength, whereas application of 6% level at 50% FC decreased the shear strength (0.4 Kpa). Application of biochar and zeoplant increased tensile strength, and at 6% level of biochar (at 25% FC) the highest tensile strength was observed (18 Kpa). The lowest penetration resistance was recorded for 6% of biochar application and at 25% FC. Addition of organic and organic-mineral amendments improved the soil structural and mechanical properties, therefore, their application is a convenient management strategy to amend the oil-contaminated soils. 

Keywords

References

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Iranian Journal of Soil Research
Volume 34, Issue 3
December 2020
Pages 407-418

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