Evaluation of the Potential of Indigenous Bacterial Consortium in the Remediation of Ogoniland Crude Oil-Polluted Rivers

Onuorah Samuel Idabor Simon and Odibo Frederick

Abstract


An evaluation of the potential of indigenous bacterial consortium in the remediation of crude oil-polluted Ogoniland rivers was carried out. Crude oil-polluted water samples were collected from Gokhana, Eleme, Khana and Tae rivers in Ogoniland, Rivers State, Nigeria. The indigenous bacteria were isolated from the samples using standard cultural techniques. The heterotrophic bacteria were characterized morphologically and biochemically  and identified as Micrococcus luteus, Bacillus cereus, Serratia marcescens, Escherichia coli, Alcaligenes faecalis, Enterobacter aerogenes, Pseudomonas aeruginosa, Aeromonas hydrophila, Nocardia asteroides and Citrobacter freundii. The ability of the bacteria to utilize crude oil was determined by inoculating them in mineral salts crude oil-medium for fourteen days. All except Escherichia coli utilized the crude oil as sole source of carbon and energy as shown by the varying degree of turbidity they produced while growing in the medium. Micrococcus luteus, Bacillus cereus, Serratia marcescens, Pseudomonas aeruginosa and the bacterial consortium in the individual samples produced heavy turbidity in the medium indicating heavy crude oil utilization. Biodegradation experiment was carried out for forty-two days and the results showed that there was an increase in the viable counts of the individual bacterium and their consortia and a decrease in the pH of the medium as well as the initial oil content. This indicated that though the indigenous bacteria degraded the crude oil when used singly, better degradation was achieved with the bacterial consortia, hence the use of indigenous bacterial consortium in the remediation of Ogoniland crude oil-polluted rivers is recommended.

Keywords


Evaluation, Indigenous, Bacterial consortium, Ogoniland, Crude oil, Rivers.

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References


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