Department of Environmental Protection and Water Engineering, Vilnius Gediminas Technical University, Saulėtekio al. 11, 10223, Vilnius, Lithuania.
Waste Science & Technology, Luleå University of Technology, Luleå, Sweden.
Chemosphere. 2020 Jun;248:126054. doi: 10.1016/j.chemosphere.2020.126054. Epub 2020 Jan 28.
The aim of this study was to compare the immobilisation of metal(loid)s in two differently contaminated soils using micro zerovalent iron (ZVI) and nano zerovalent iron (nZVI) particles. Chromated copper arsenate-contaminated soil contained high amounts of As, Cu, Cr, and Zn, whereas mining-contaminated soil contained high amounts of As, Cu, and Pb. Contaminated soils were amended using 2% ZVI and nZVI. As determined by the leaching procedures, nZVI was more efficient in immobilising all the studied metal(loid)s in the soils compared to ZVI. The greatest immobilisation was achieved for As in both soils. The long-term stability of immobilised metal(loid)s was studied in mining-contaminated soil by performing thermal oxidation (ageing). In the ZVI and nZVI-treated soils, high retention results were achieved for As and Cu, whereas in the ZVI and nZVI-treated soils, significant desorption of Pb was observed. The results also showed that retention of metal(loid)s over a long period of time could be more effective in soils treated with ZVI, as the crystallisation of Fe in ZVI-treated soil was to a lesser extent compared to the crystallisation of Fe in nZVI-treated soil.
本研究旨在比较两种不同污染土壤中使用微纳米零价铁（ZVI 和 nZVI）固定金属（类）的效果。铬酸铜砷酸盐污染土壤中含有高浓度的 As、Cu、Cr 和 Zn，而采矿污染土壤中则含有高浓度的 As、Cu 和 Pb。受污染的土壤用 2%的 ZVI 和 nZVI 进行改良。通过浸出程序确定，nZVI 比 ZVI 更有效地固定土壤中所有研究的金属（类）。在两种土壤中，As 的固定效果最佳。通过热氧化（老化）研究了采矿污染土壤中固定金属（类）的长期稳定性。在 ZVI 和 nZVI 处理的土壤中，As 和 Cu 的保留率很高，而在 ZVI 和 nZVI 处理的土壤中，Pb 的解吸量很大。结果还表明，ZVI 处理的土壤中，金属（类）的长期保留效果可能更有效，因为 ZVI 处理的土壤中 Fe 的结晶程度低于 nZVI 处理的土壤。
