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消除稳定剂对抗作用,通过创新的逐步蒸汽闪热加热,有效稳定Pb和As共同污染的土壤

Xiaolu Fan¹, Xue Wu², Xinzi Wang¹

¹School of Environment, Tsinghua University, Beijing 100084, PR China.

Journal of hazardous materials

|May 22, 2024

概括

本研究引入了一种逐步蒸汽闪热 (SSFH) 方法,有效地稳定污染土壤中的和,克服化学稳定剂的局限性. 创新的SSFH方法使两种重金属固定不动,提供了具有成本效益和可持续的土壤整治解决方案.

科学领域:

环境科学环境科学
土壤修复土壤的修复.
地质化学地质化学

背景情况:

在共同污染的土壤中, (Pb) 和 (As) 的化学稳定受到稳定剂和污染物之间的对抗反应的阻碍.
由于这些相互矛盾的相互作用,传统方法难以同时固定Pb和As.

研究的目的:

开发和验证一个有效和成本效益的阶段性蒸汽闪热 (SSFH) 策略,用于在土壤中同时固定Pb和As.
使用SSFH方法阐明Pb和As稳定的基本机制.

主要方法:

采用了两步的SSFH工艺,在第一步使用Ca ((H2PO4) 2) 和第二步使用Fe2 ((SO4) 3).
使用毒性特征泄漏程序 (TCLP) 来评估Pb和As的可泄漏性.
采用X射线吸收近边结构 (XANES) 光谱学来研究Pb和As的化学转化.
长期稳定性通过100年酸雨模拟来评估.

主要成果:

逐步的SSFH实现了最小的TCLP-Pb (0.778 mg/L) 和TCLP-As (0.327 mg/L),显著优于单步化学稳定,该稳定显示了对抗作用.
在酸雨模拟下,SSFH使漏性As降低了69.8%,表明了出色的长期稳定性能.
这种方法使稳定剂剂量减少了43.2%,总成本降低了14.9%.

结论:

逐步的SSFH策略有效地固定Pb和As,通过促进它们转化为稳定的化合物,如Pb3 ((PO4) 2和FeAsO4,防止对抗反应.
该方法提供了一种绿色,可持续和具有成本效益的替代方法,用于修复重金属共污染的土壤.
SSFH方法提供了一种新的解决方案,适用于其他面临类似稳定挑战的共同污染土壤场景.

关键词:

具有对抗性的效应.Pb 和 As 共同污染的土壤.整治整治整治整治稳定的稳定性稳定的稳定性

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