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Three strains of novel bacteria were isolated from oil-contaminated sediment from the Arabian Gulf ( Brevibacillus brevis T2C2008 ,  Proteus mirabilis T2A12001 , and  Rhodococcus quinshengi TA13008 ). The isolated strains were tested for their degrading efficacy of low and high molecular hydrocarbon (naphthalene and pyrene). The efficacy of the two-hydrocarbon degradation by the isolates bacterial was determined at a temperature of 25 °C and 37 °C and pH of 5.0 and 9.0. In inoculated media at 37 °C,  Rhodococcus qinshengi  fully metabolized naphthalene and degrade 56% of pyrene.  Brevibacillus brevis  break down over 80% of naphthalene at room temperatures (25 °C). However, it was found that  P. mirabilis  and  R. qinshengi  biodegraded nearly 94% of naphthalene in the incubated media. The capacity for pyrene and naphthalene degradation in varying pH and temperature conditions was shown to be significant in  Rhodococcus qinshengi  because of its mineralization exceeding 50% across the tested pH and temperature. This implies that the isolated strains are ideal for biodegradation of contaminated sediment with naphthalene and pyrene.

Biodegradation of selected hydrocarbons by novel bacterial strains isolated from contaminated Arabian Gulf sediment