【摘要】 利用微生物固定化技术,研究了微生物固定化菌剂对土壤中菲、蒽、芘、(艹屈)和苯并(a)芘的降解动态,并且采用Michaelis-Menton和Monod动力学模型对结果进行拟合。结果显示,4种处理(TB02、TB07、TBB03、TBB08)均有降解菲、蒽、芘、(艹屈)和苯并(a)芘的能力。其中,处理TB02的降解能力强、降解速率快、半衰期短且处理成本低,而处理TB07则需要较长时间作用于PAHs污染土壤,其降解能力才能充分发挥出来。当菲、蒽、芘、散发出(艹屈)和苯并(a)芘的初始浓度均为20mg·kg-1时,42d后,TB02对菲、蒽、芘、(艹屈)和苯并(a)芘的降解率分别为84.32%、85.24%、82.59%、43.75%和62.25%;133d后,TB07对5种污染物的降解率分别为95.00%、95.24%、90.93%、74.82%和72.20%。通过比较5种污染物半衰期,其可降解性由大到小依次为菲、蒽、芘、苯并(a)芘、(艹屈)。更多还原

【Abstract】 By using four immobilized microbial agents TB02, TB07, TBB03 and TBB08, the degradation of soil phenanthrene, anthracene, pyrene, chrysene and benzo(a)pyrene was studied, and fitted with Michaelis-Menton and Monod dynamic models. The results showed that all the agents had the ability of degrading test polycyclic aromatic hydrocarbons (PAHs), among which, TB02 was most effective. Under the action of TB02, the degradation of test PAHs was faster, half-life was the shortest, while the cost was lower. On the contrary, TB07 required more time to fully display its degradation ability. When the phenanthrene, anthracene, pyrene, chrysene, and benzo(a)pyrene had an initial concentration of 20 mg·kg-1, their degradation rate by TB02 after 42 days was 84.32%, 85.24%, 82.59%, 43.75% and 62.25%, and that by TB07 after 133 days was 95.00%, 95.24%, 90.93%, 74.82% and 72.20%, respectively. Through the comparison of the half-life of test PAHs, it was indicated that the degradability of these PAHs was decreased in the order of phenanthrene>anthracene>pyrene>benzo(a)pyrene>chrysenemodel.更多还原