细菌在黄土上的吸附/解吸特征及吸附量对土壤石油降解的影响

Adsorption /Desorption Characteristics of Bacteria on Loess and Influence of Adsorption Quantity on Oil degradation in Soil

本文通过室内实验,研究了细菌在黄土上的吸附解吸特征,并探讨了其在黄土上的吸附量对土壤石油降解的影响。结果表明,细菌在黄土上的吸附符合Langmuir等温吸附方程,当菌液浓度较低时,吸附量随浓度增加而急剧上升,随着菌液浓度进一步增加,吸附量随浓度的增加渐渐平缓;细菌在黄土上的解吸作用极弱,一旦被吸附后,较难被解吸,解吸量平均仅是吸附量的1%;随着细菌在土壤上吸附量的增加,降解率相应提高。当土中含油量为3.52%,菌液浓度为1.0×108个/ml,经过30d后,降解率可达到45%。

Through lab experiments, the bacteria adsorption and desorption features on loess is researched and the effect of adsorption capacity on the degradation of oil is discussed. The results show that the adsorption of bacteria on loess accords with Langmuir isothermal ad- sorption equation, when the concentration of bacteria is lower, adsorption capacity increases intensely with it; when the concentration of bacteria increases further, the increasing of adsorption capacity gradually goes flat with it, Desorption of bacteria from the loess is very weak, once adsorbed, desorption is more difficult, the average desorption quantity is only 1% of the adsorption capacity. Degradation rate can enhance with the increasing of adsorbed bacteria, when oil content of the soil is 3.52% and the concentration of bacteria is 1.0 × 10^8 个/ml, the degradation rate can reach 45 % in 30 days.