Petroleum contaminated soil in Oman: Evaluation of bioremediation treatment and potential for reuse in hot asphalt mix concrete |
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Authors: | Ahmad Jamrah Ahmed Al-Futaisi Hossam Hassan Salem Al-Oraimi |
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Institution: | (1) Department of Civil and Architectural Engineering, Sultan Qaboos University, P.O. Box 33, Al-Khod, Muscat 123, Muscat, Oman |
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Abstract: | This paper presents a study that aims at evaluating the leaching characteristics of petroleum contaminated soils as well as
their application in hot mix asphalt concrete. Soil samples are environmentally characterized in terms of their total heavy
metals and hydrocarbon compounds and leachability. The total petroleum hydrocarbon (TPH) present in the PCS before and after
treatment was determined to be 6.8% and 5.3% by dry weight, indicating a reduction of 1% in the TPH of PCS due to the current
treatment employed. Results of the total heavy metal analysis on soils indicate that the concentrations of heavy metals are
lower when extraction of the soil samples is carried out using hexane in comparison to TCE. The results show that the clean
soils present in the vicinity of contaminated sites contain heavy metals in the following decreasing order: nickel (Ni), followed
by chromium (Cr), zinc (Zn), copper (Cu), lead (Pb), and vanadium (V). The current treatment practice employed for remediation
of the contaminated soil reduces the concentrations of nickel and chromium, but increases the concentrations of all remaining
heavy metals. |
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Keywords: | Petroleum contaminated soil Toxicity characteristic leaching procedure Heavy metals Hydrocarbons Hot asphalt mix |
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