Efficacy of enhanced natural attenuation (land farming) technique in the remediation of crude oil-polluted agricultural land

By Wegwu, M. O., Uwakwe, A. A. and Anabi, M.A.


In this study, a bioremediation strategy that utilizes Remediation by Enhanced Natural Attenuation (RENA) technique otherwise termed (land farming) was adopted in the recovery of crude oil polluted farm lands. The levels of total petroleum hydrocarbon (TPH), polycyclic aromatic hydrocarbon (PAH) and selected heavy metals at three polluted sites were analyzed after 14 days of application of the RENA technique. TPH contents of polluted soils at sites 1, II and III decreased from 14, 569 to 45.7 mg/kg; 3,713 to 139 mg/kg; and 2,156 to 103 mg/kg, respectively.  The reduction in the levels of PAH contents of the soils were as follows: 39.2 to <0.0001 mg/kg (site I); 12.0 to 2.38 mg/kg (site II) and 5.84 to <0.0001 mg/kg (site III).  Similarly, most heavy metal contents of the polluted soils (sites 1, II and III) significantly decreased in their concentrations with the technique. Results obtained in this study suggest that the technique was efficient in the remediation of crude oil polluted agricultural lands.


Key Words : Remediation, Total Petroleum hydrocarbon, polycyclic aromatic hydrocarbon, Heavy metals, Natural attenuation.

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