砂土介质中微生物对铀尾矿库渗出液淤堵吸附实验研究

The Clogging and Adsorption Experimental Research of Microorganisms for Uranium Tailing Impoundment Effluent in Sands

本文选取了5种生长在某铀尾矿库周边的土著微生物,对比分析其在放射性环境中繁殖情况,选用OD600值较高且在振荡培养下能快速形成明显菌落的黑曲霉进行淤堵实验.以铀尾矿库周边地层中的砂土为原料构建物理模型,向砂土中均匀灌入黑曲霉孢子悬液,在营养液充足的情况下5周后砂土渗透系数降低了72%,铀酰离子的吸附率达到了89%.实验表明,在砂土介质中黑曲霉的繁殖封堵及吸附分解能够较为有效地对渗漏源进行处理.本实验为处理铀尾矿库渗漏提供了新途径、新方法.

In this paper, five kinds of indigenous microorganisms was selected in the sur- rounding region of a uranium tailing impoundment, and the reproduction state of microor- ganisms in the radioactive environment situation was compared and analysed, the aspergillus niger was chosen as the experimental object for higher OD600 by shaking culture and can form colony quickly.And building the physical model with the sands as raw materi- al in the surrounding strata of uranium tailings impoundment, the aspergillus niger spore suspension was injected into the sands evenly, and the permeability coefficient of sands was reduced by 72% after five weeks under the adequate nutrient supplying, the adsorption rate of uranyl ion reached 89%.Experimental results show that： reproduction plugging and ad-sorption decomposition of aspergillus niger can deal with leakage of radioactive source ef- fectively in sand medium.This experiment provides a new way for the treatment of uranium tailing impoundment leakage.