论文部分内容阅读
基于微生物对材料的腐蚀特点,在材料性能表征的基础上,采用微生物学、TG-DTA、CEC和TEM研究了从高放废物处置库预选区土壤中分离的细菌菌群对膨润土的腐蚀影响。结果表明:添加5.5倍高浓度培养基可以维持菌群一定周期内的持续活性;细菌菌群影响膨润土原结构中吸附水、层间水及结构水的含量,且于849.94℃时出现明显的吸热谷,表明菌群加速了膨润土热稳定性的下降;随腐蚀周期延长,无菌组和有菌组均与原样间存在极显著性差异(p<0.01),细菌促进了膨润土化学键类型及键能发生变化,使其阳离子交换量下降;细菌菌群加速膨润土发生团聚且晶面间距减小率比无菌组大约25.912%,最终导致晶格缺陷。
Based on the characterization of the materials, the effects of bacterial species isolated from the HLB pre-selected soil on the corrosion of bentonite were studied by using microbiology, TG-DTA, CEC and TEM. The results showed that adding 5.5-fold high concentration of medium could maintain the activity of the bacteria for a certain period of time. The bacterial flora affected the content of adsorbed water, interlayer water and structured water in the original structure of bentonite, and obvious absorption occurred at 849.94 ℃ Hot valley, indicating that the flora accelerated the thermal stability of bentonite decreased; with the extension of the corrosion cycle, there was a significant difference between the aseptic group and the aseptic group (p <0.01), and the bacteria promoted the chemical bond type of the bentonite Can change, so that the cation exchange capacity decreased; bacterial flora accelerated the reunion of bentonite and intergranular spacing reduction rate of about 25.912% than the sterile group, eventually leading to lattice defects.