Abstract
Microbial degradation is a useful tool for inhibiting or preventing polycyclic aromatic hydrocarbons (PAHs) widely distributed in marine environment after oil spill accidents. This study aimed to evaluate the potential and diversity of bacteria Bacillus sp. PAH-2 on Benzo (a) anthracene (BaA), Pyrene (Pyr), and Benzo (a) pyrene (BaP), their composite system, aromatic components system, and crude oil. The seven-day degradation rates against BaA, Pyr, and BaP were 20.6%, 12.83%, and 17.49%, respectively. Further degradation study of aromatic components demonstrated PAH-2 had a high degradation rate of substances with poor stability of molecular structure. In addition, the degradation of PAHs in crude oil suggested PAH-2 not only made good use of PAHs in such a more complex structure of pollutants but the saturated hydrocarbons in the crude oil also showed a good application potential.
Highlights
Over the past few decades, several serious oil spill accidents have occurred, which caused serious pollution to the marine environment
It is worth noting that approximately 3.9% of polycyclic aromatic hydrocarbons (PAHs) by weight were released during the Deepwater Horizon oil spill accident [4]
PAHs are classified as B2 carcinogenic substances: Once these substances came into the human body, it is purveyed to the human nervous system and hematopoietic system which affects human organ lesions [12,13]
Summary
Over the past few decades, several serious oil spill accidents have occurred, which caused serious pollution to the marine environment. It is worth noting that approximately 3.9% of PAHs by weight were released during the Deepwater Horizon oil spill accident [4]. 0.34 mg/L, respectively, while the concentration of total PAHs in the surface water of the marine environment is normally ng/L [5]. PAHs have the biological characteristics of bioaccumulation, biomagnification, and persistent toxicity. Their cumulative accumulation of toxicities through the food chain poses a serious threat to the biological population and human health in the aquatic environment and leads to ecosystem degeneration and degradation [14]
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