Polycyclic aromatic hydrocarbons (PAHs) are widespread pollutants and they can cause cancer, abnormality and mutation. Nine natural PAHs-degrading bacteria were obtained from polluted areas. These bacteria and the bacterial mixture can degrade phenanthrene, anthracene, pyrene and benzo[a]pyrene. The bacterial mixture can increase the degradation rates of several PAHs compounds, such as phenanthrene and benzo[a]pyrene, during the repaired process, and the degradation rates of these compounds were over 83%. The efficient degradation of PAHs should be the cooperation of key enzymes, such as dioxygenase and dehydrogenase, in the bacterial mixture. The main accumulated metabolite of above four PAHs was dibutyl phthalate detected by gas chromatography mass spectrometry, indicating that the degradation process of PAHs mainly represented the phthalic acid pathway in this work. And the toxicity of PAHs could be decreased by biodegradation. The effects of cultural factors, such as culture time, temperature, metal ions and pH on PAHs degradation efficiency were also studied.

多环芳烃（PAHs）是广泛的污染物，它们可以导致癌症，异常和突变。从污染区获得了九种降解PAHs的天然细菌。这些细菌和细菌混合物可以降解菲，蒽，pyr和苯并[a] py。在修复过程中，细菌混合物可以提高几种PAHs化合物的降解率，例如菲和苯并[a] re，这些化合物的降解率超过83％。PAHs的有效降解应该是细菌混合物中关键酶（例如双加氧酶和脱氢酶）的协同作用。以上四种多环芳烃的主要累积代谢物是气相色谱质谱法检测到的邻苯二甲酸二丁酯，表明在这项工作中，PAHs的降解过程主要代表了邻苯二甲酸途径。生物降解可以降低多环芳烃的毒性。还研究了培养时间，温度，金属离子和pH等文化因素对PAHs降解效率的影响。