Advancing the State-of-the-Art in Bentonite Barrier Research: Measuring Membrane Behavior and Diffusion at Elevated Temperatures
Advancing the State-of-the-Art in Bentonite Barrier Research: Measuring Membrane Behavior and Diffusion at Elevated Temperatures
复制标题
推进膨润土屏障研究的最新技术：测量高温下的膜行为和扩散
DOI：
10.1061/9780784484050.011
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Bohnhoff, Gretchen L.
中科院分区：
文献类型：
--
作者：
Rahman, Sayed Arafat;Sample-Lord, Kristin M.;Bohnhoff, Gretchen L.
钠基膨润土（NaB）广泛用于围堵屏障，以限制污染物向环境中的迁移。NaB屏障在诸如垃圾填埋场、蓄水池和放射性废物处理等应用中的性能依赖于NaB在长时间和不断变化的环境条件下限制液体和污染物通过屏障的能力。先前的研究结果表明，NaB可能表现出显著的膜行为（溶质限制），可能通过减少液体和污染物通量来增强屏障的性能。然而，由于实验测试的挑战，NaB在不同温度和化学条件下的扩散和膜行为尚未得到很好的理解。这种知识差距限制了我们预测暴露在高温下（例如，高放射性废物处置）的NaB屏障中污染物运输的能力。为了解决这一挑战，研究人员开发了一种创新的测试设备，用于在受控温度和化学条件下测量粘土中耦合膜的行为和扩散。该装置配备了加热元件、温度传感器和温度控制器，以及远程数据记录和液压控制功能。介绍了NaB的装置设计、测试过程和实例结果。初步结果表明，测试装置在整个测试过程中保持恒定的温度条件，膜的性能随着温度的升高而下降。
Sodium bentonite (NaB) is widely used in containment barriers to limit contaminant migration into the environment. The performance of NaB barriers in applications such as landfills, impoundments, and radioactive waste disposal relies on the ability of the NaB to limit liquid and contaminant flux through the barrier for extended durations and under changing environmental conditions. The results of previous studies indicate that NaB may exhibit significant membrane behavior (solute restriction), potentially enhancing the performance of the barrier by reducing both liquid and contaminant flux. However, diffusion and membrane behavior in NaB under variable temperature and chemical conditions is not well understood, largely due to experimental testing challenges. This knowledge gap limits our ability to predict contaminant transport through NaB barriers exposed to elevated temperatures (e.g., high-level radioactive waste disposal). To address this challenge, an innovative testing apparatus was developed for measurement of coupled membrane behavior and diffusion in clays under controlled temperature and chemical conditions. The setup was equipped with heating elements, temperatures sensors, and temperature controllers, along with remote data logging and hydraulic control features. The apparatus design and testing procedures, as well as example results for NaB are presented. Preliminary results indicate that the testing apparatus maintained consistent temperature conditions throughout testing and that membrane behavior decreased with increasing temperature.
登录
查看更多内容
影响因子：
3.6
作者：
Charles D. Shackelford
通讯作者：
Charles D. Shackelford
影响因子：
2.7
作者：
Daniels, Katherine A.;Harrington, Jon F.;Wiseall, Andrew C.
通讯作者：
Wiseall, Andrew C.
影响因子：
11.4
作者：
Malusis, MA;Shackelford, CD
通讯作者：
Shackelford, CD
使用原状粘土实验室测定污染物的扩散和分布系数
影响因子：
3.6
作者：
R. K. Rowe;Chris J. Caers;F. Barone
通讯作者：
F. Barone