Degradation characteristics of two strains bacillus on petroleum in Yumen Oilfield

Using petroleum as the sole carbon source,two bacteria strains(A and B), which have high degrading capacity for crude oil, are isolated and screened out from petroleum-polluted soil in Yumen oil-field, and their degradation ability are studied.The results show that after 12 days the degradation rate of the strains A and B are 61.71% and 53.12%,respectively.GC-MS analysis indicates that in the saturate hydrocarbons,n-alkane, alkyl cyclohexane and dicycloalkane could be degraded obviously; in the aromatic hydrocarbons, naphthalene and alkyl naphthalene almost disappeared after degradation; phenanthrene and alkyl phenanthrene are degraded obviously by the strain A. The two strains are identified as bacillus.