Remediation of Crude Oil Contaminated Soil by Enhanced Natural Attenuation Technique
Loading...
Date
2015
Authors
Ebuehi, O.A.T.
Journal Title
Journal ISSN
Volume Title
Publisher
J. Appl. Sci. Environ.
Abstract
The concentrations of nitrogen, phosphorus, total hydrocarbon utilizing bacteria (THUB), total
heterotrophic bacteria (THB) and total petroleum hydrocarbon were determined using the remediation by enhanced natural
attenuation (RENA) in a crude oil contaminated farmland in Rivers state, Nigeria. A TPH concentration of 1.1004 x10 4
mg/kg of the sandy soil was achieved after spiking and tilling. There was a reduction in the TPH level from 300mg/kg
after 8weeks, to 282mg/kg after 10weeks.No significant reduction in the TPH level was observed after the 10th week. The
nitrogen and phosphorus levels of the sandy soil were 24.6 and 22.8mg/kg respectively. This suggests that the nitrogen and
phosphorus levels could no longer support biodegradation at the residual TPH levels of 282mg/kg and 22.8mg/kg after
spiking and tilling respectively, which further reduced to 0.12mg/kg and 1.7mg/kg respectively after 10 weeks. The total
hydrocarbon utilizing bacteria (THUB) increased from 3.0 x 10 4
cfu/g to 8.55x10 4
cfu/g and finally reduced to 5.38 x10 4
cfu/g, while the total heterotrophic bacteria (THB) reduced from 1.22 x10 8
cfu/g to 5.98 x 10 5
cfu/g. Data of the study
indicate that remediation enhanced natural attenuation technique could be employed to remediate a farm settlement
contaminated by crude oil.
Description
Keywords
Citation
EBUEHI, O A T; 1 ABIBO, I B; SHEKWOLO, P D; SIGISMUND, K I; 1 ADOKI, A; OKORO, I C