In Situ Bioremediation Potential of an Oily Sludge-Degrading Bacterial Consortium |
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Authors: | Sanjeet Mishra Jeevan Jyot Ramesh Chander Kuhad Banwari Lal |
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Institution: | (1) Tata Energy Research Institute, New Delhi 110 003, India, IN;(2) Department of Microbiology, University of Delhi South Campus, New Delhi, India, IN |
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Abstract: | A field-scale study was conducted in a 4000 m2 plot of land contaminated with an oily sludge by use of a carrier-based hydrocarbon-degrading bacterial consortium for bioremediation.
The land belonged to an oil refinery. Prior to this study, a feasibility study was conducted to assess the capacity of the
bacterial consortium to degrade oily sludge. The site selected for bioremediation contained approximately 300 tons of oily
sludge. The plot was divided into four blocks, based on the extent of contamination. Blocks A, B, and C were treated with
the bacterial consortium, whereas Block D was maintained as an untreated control. In Block A, at time zero, i.e., at the beginning
of the experiment, the soil contained as much as 99.2 g/kg of total petroleum hydrocarbon (TPH). The application of a bacterial
consortium (1 kg carrier-based bacterial consortium/10 m2 area) and nutrients degraded 90.2% of the TPH in 120 days, whereas in block D only 16.8% of the TPH was degraded. This study
validates the large-scale use of a carrier-based bacterial consortium and nutrients for the treatment of land contaminated
with oily sludge, a hazardous hydrocarbon waste generated by petroleum industry.
Received: 20 October 2000 / Accepted: 22 March 2001 |
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