暴露于NaCl和NH4Cl溶液的本托尼特屏障的阴离子拦截和透性特征
Wen-Jing Sun1, Qian-Tong Tang2, Ri-Dong Fan2
1College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China
概括
石屏障在垃圾填埋污水中拦截 (NH4+) 比 (Na+) 更好. 然而,氨溶液增加了本托尼特的含量.
科学领域:
- 地质技术工程 地质技术工程
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 垃圾填埋场的液含有高度的 (Na+) 和 (NH+) 离子.
- 这些离子可以降解本托尼特壁垒,损害它们的环境保护功能.
- 了解石与这些污染物的相互作用对于有效的垃圾填埋场设计至关重要.
研究的目的:
- 研究暴露于NaCl和NH4Cl溶液的本托尼特屏障的污染拦截和透性特征.
- 分析影响顿石对Na+和NH的差异性行为的因素.
- 评估本托尼特壁垒在受污染的环境中的性能.
主要方法:
- 用于制备含有变异性 (0-15%) 班托尼特混合物的班托尼特改性混合物.
- 样品暴露于不同度的NaCl和NHCl溶液 (9.4-74.80 mmol/L).
- 测量离子拦截和液压导电系数.
主要成果:
- 与Na+相比,本托尼特屏障证明了NH4+的优越拦截.
- 在暴露于NH4Cl溶液和NaCl溶液的本托尼特样本中观察到更高的液压导电性.
- 阴离子交换,化半径,结和化度的差异解释了观察到的行为.
结论:
- 虽然在拦截NH4+方面是有效的,但本托尼特屏障在NH4Cl溶液中显示出增加的液压导电性.
- 在NH4Cl溶液中这种增强的导电性增加了污染物从垃圾填埋场运输的风险.
- 这些发现凸显了在本托尼特屏障设计和性能评估中需要仔细考虑液化学的必要性.
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