青顶拟多孔菌对单一和复合多环芳烃的降解特性

利用中国东北林区普遍存在白腐菌——青顶拟多孔菌,降解单一和复合多环芳烃,分别测定了菲、蒽、芘于11,22,33d的累积降解率.结果显示,对于单一多环芳烃,该菌种降解能力由强到弱依次为菲>蒽>芘,33d累积降解率依次为96.56%、94.76%和57.53%;对复合多环芳烃降解中,菲和芘的累积降解率分别为99.46%和61.09%.在复合多环芳烃的降解研究中发现,少量蒽的加入,刺激了菌种对菲和芘的降解,使菲和芘的降解率分别提高了2.9%和3.56%.由此提示,在研究降解高环、难降解多环芳烃时,可利用低环多环芳烃对菌种的刺激作用,在体系内形成高、低环多环芳烃的共代谢,以达到更加高效降解多环芳烃的目的.

Degradation characteristics of single and mixed PAHs by Polyporellus picipes

Polyporellus picipes, which existed commonly in forest area of northeast China, was used to degrade single and mixed polycyclic aromatic hydrocarbons (PAHs). The accumulated degradations of phenanthrene, anthracene and pyrene were measured in 11, 22and 33d respectively. The degradation of single PAHs were phenanthrene > anthracene> pyrene, and the accumulated degradation efficiencies of 33days were 96.56%, 94.76% and 57.53%, respectively. The accumulated degradation efficiencies of phenanthrene and pyrene in the presence of anthracene were 99.46% and 61.09%. In mixed PAHs degradation, adding a bit of anthracene would stimulate Polyporellus picipes to degrade phenanthrene and pyrene, and make the degradation efficiencies of them raise 2.9% and 3.56%. In conclusion, to improve the degradation of high molecular weight (HMW) or refractory PAHs, the low molecular weight (LMW) PAHs could be used as the co-metabolism substrates for HMW PAHs degradation.