[Progresses in anaerobic biodegradation of polycyclic aromatic hydrocarbons--a review]

Polycyclic aromatic hydrocarbons (PAHs) are a recalcitrant group of contaminants in the environment. PAHs degradation has been extensively studied and well understood under aerobic conditions, whereas little is known about anaerobic degradation of PAHs. Here, we reviewed recent progress in anaerobic degradation of PAHs. We focused on naphthalene and phenanthrene as model compounds. We addressed the main rate-limiting factors involved, including the bioaccessibility of PAHs, the amendment of nutrients and elector acceptors, the degrading microorganisms, and the biochemistry of the initial activation and subsequent enzyme reaction involved in the pathway. Prospects on this field are also discussed.