微生物对土壤与沉积物吸附多环芳烃的影响

以枯草芽孢杆菌为接种微生物,研究微生物对沉积物和湿地土壤吸附多环芳烃（PAHs）菲、苯并［a］芘过程的影响.结果表明,枯草芽孢杆菌对菲与苯并［a］芘都可进行吸附或生物降解,48h液相PAHs浓度达到平衡时,微生物对菲消除了98％,对苯并［a］芘消除85％;接种的样品48h吸附等温线均呈线形,能较好地符合线性方程;在接种微生物情况下,沉积物与土壤对菲和苯并［a］芘吸附特征均发生较大变化,对菲的吸附量增大约35倍,而对苯并［a］芘的吸附量却降低了2/3左右;未接种微生物的土壤和沉积物对菲解吸率为20％,接种的样品组为2.9％,而对苯并［a］芘的解吸结果与菲相反,未接种的对照组为4％,接种的样品组为13％.微生物在土壤与沉积物吸附PAHs的过程中起主导作用.

Effect of Microorganism for Polycyclic Aromatic Hydrocarbons (PAHs) Sorption on Surface Sediments and Soils

Influence of microorganism for polycyclic aromatic hydrocarbons (PAHs) sorption on surface sediments and soils in Yellow River Delta was studied. The results indicated that phenanthrene and benzo[a]pyrene could be adsorbed or biodegraded by microorganism, and 98% phenanthrene and 85% benzo[a]pyrene was eliminated by microorganism in adsorption process. Sorption isotherms of soils and sediments with and without Microorganism were described by linear isotherm equation. Adsorption capacity of samples with microorganism increased about 35 times than that of without microorganism, but benzo[a]pyrene adsorption capacity decreased about 3 times. In desorption process, samples with microorganism desorbed less phenanthrene than without microorganism, but more benzo[a]pyrene. Microorganism plays an important role in adsorption process.