厌氧微生物降解多环芳烃研究进展

Progresses in anaerobic biodegradation of polycyclic aromatic hydrocarbons—A review

摘要:

摘要:多环芳烃(PAHs)是一类普遍存在于环境介质中的难降解有机污染物，相对于好氧微生物降解PAHs的研究，厌氧微生物降解PAHs 的研究则相对较少。本文从厌氧微生物降解PAHs 的研究背景，厌氧降解微生物的特点和不同厌氧降解还原反应体系的角度综述了厌氧微生物降解PAHs的概况;结合厌氧微生物降解萘和菲转化途径的介绍，推断了其降解机制的内在原因;同时通过总结影响厌氧微生物降解PAHs的主要因素(包括:PAHs 的生物可利用性、外源营养物质的添加、外源电子受体的添加、特定厌氧降解菌的筛选强 化和部分环境因素等)，指出了制约降解进程的潜在限制因子;并对厌氧微生物降解PAHs 研究目前存在的问题和未来的发展方向作了简述与展望。

Abstract:

Abstract: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．