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垃圾填埋场液缩物和抗氧金矿土壤的共同处置,使用一部分地质聚合物系统来固定阴离子和阴离子重金属

Hao Zhang¹, Zehua Ji², Weitong Chen¹

¹State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China.

Journal of hazardous materials

|November 18, 2023

概括

这项研究提高了重金属土壤整治的地质聚合物技术,通过使用垃圾填埋场液缩物 (LLC) 来使和等离子和离子固定至99%以上. 这种方法有效地将有毒金属的泄减少到ppb水平.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
地质化学地质化学

背景情况:

地质聚合物技术在重金属土壤修复方面显示出前景.
传统的地质聚合物由于其化学性质,难以固定阴离子重金属.
矿土壤 (AMS) 通常含有阴离子和阴离子重金属,这构成了修复挑战.

研究的目的:

开发一种有效的地质聚合物系统,用于在矿土壤 (AMS) 中固化/稳定阴离子和阴离子重金属.
调查垃圾填埋场液缩物 (LLC) 作为和酸来源在提高地质聚合物性能方面的作用.
评估LLC对 (Sb) 和 (As) 的固定效率和化学稳定性的影响.

主要方法:

构建了一个基于高炉渣的单部分地质聚合物系统.
将垃圾填埋场液缩物 (LLC) 纳入地质聚合物基质中.
使用抗矿土壤 (AMS) 作为地质聚合物系统的组成部分.
分析了重金属固定率和漏度.
研究了Sb/As稳定的机制,包括弗里德尔盐的形成和酸复合.
湿和干方法的比较和评估的地质聚合物压力强度.

主要成果:

此外,LLC的增加显著提高了Sb和As的固定率,达到99%以上.
所有重金属离子的漂水度被降低到每亿分之一 (ppb) 的水平.
通过促进弗里德尔盐的形成,湿酸复合和地质聚合,LLC提高了Sb/As的稳定性.
湿固化使地质聚合物压力强度提高了38.5%,并有利于弗里德尔盐的形成.
由于其SiO2含量,添加30%重量的AMS对地质聚合物强度产生了积极的影响.

结论:

开发的地质聚合物系统使用LLC在AMS中有效地固定了阴离子和阴离子重金属.
这种方法为LLC和AMS的共同处置提供了一种可行的,无害的方法.
该研究表明,地质聚合物的效率在复杂重金属修复过程中显著提高.

关键词:

亚是一种.高炉废渣是高炉的废渣之一.油炸的盐是炸的盐.固化 / 稳定固化 / 稳定

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