Abstract
Petroleum effluent is discharged into River Rido and this poses a threat to the communities that utilize the water downstream of River Rido, the ultimate recipient of the effluent. A total of five hydrocarbonoclastic bacteria were isolated from the petroleum refinery effluent. The isolates were inoculated separately into mineral salt medium supplemented with 1% crude oil to determine their growth rate in a hydrocarbon substrate. All five bacterial isolates manifested no lag phase of growth. Proteus vulgaris, Klebsiella pneumoniae, Serretia marcescens and Streptomyces sp. exhibited exponential, stationary and death phases of growth while Pseudomonas aeruginosa had only exponential and stationary phases of growth on the 16th day of incubation. Mixed culture consortium of all five bacteria isolates had the highest bioremediation potential of 68% as against the single inoculations of Pseudomonas aeruginosa, Serratia marcescens, Klebsiella pneumoniae, Proteus vulgaris and Streptomyces spp. which had 66.4%, 62.4%, 59.7%, 52% and 57% respectively. Hence, the isolated bacteria can be used for bioremediation of petroleum effluent.
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