The Study On Factors Controlling The Biodegradation Of Alkyl Polycyclic Aromatic Hydrocarbons In Crude Oils

The biodegradation processes of polycyclic aromatic hydrocarbons (PAHs) have been received widespread attention by the fields of environmental geochemistry and environmental toxicology.In this paper, biodegradation processes of alkyl naphthalene and alkyl phenanthrene were analyzed by natural degradation and laboratory degradation sequence. Also the composition of heteroatom, such as O1, O2 and N1, N1O1 N1O2, was characterized by the Fourier ion cyclotron mass spectrometry (FT-ICR-MS). According to the results, the PAHs biodegradation in surface environment is mainly controlled by the molecular structure and microbial community. (1) In surface environment, Proteobacteria and Actinomycetes variations are relate to PAHs biodegradation rates. (2) In the surface environment, the compound with higher polarizability is more sensitive to be biodegraded (3) under anaerobic conditions, alkyl naphthalene degradation processes are different form aerobic conditions, controlling by the molecular equilibrium stability. Therefore, the isomers with more stable equilibrium geometries have stronger resistance to be biodegraded. The results provide a deeper understanding of alkyl PAHs degradation in the surface environment, and have important applications for the PAHs bioremediation.