Division of Waste Science & Technology, Luleå University of Technology, Luleå, Sweden.
Waste Manag Res. 2011 Jan;29(1):3-12. doi: 10.1177/0734242X10382819. Epub 2010 Sep 29.
Thermal treatment is used to remediate soil co-contaminated with organic and inorganic contaminants. It destroys organic contaminants, but the remaining inorganic contaminants require further treatment. In this study the effects of thermal treatment on the mobility, speciation and chemical fractionation of As, Cr and Cu in a CCA-polluted soil were evaluated by leaching tests, As speciation assays and a sequential extraction procedure. The soil was sieved into four size fractions (<0.125, 0.125-0.250, 0.250-0.500 and 0.500-1.0 mm), each of which was treated at 800°C and analysed in comparison with the untreated soil. The leaching of As and Cr increased by factors of 18-40 and 2-23, respectively, while the mobility of Cu decreased 12-14-fold after treatment. The concentration of As(V) in pore water of the finest soil fraction increased 19-fold, whereas that of As(III) remained constant. The treatment reduced As, Cr and Cu associated with the reducible soil fraction. In addition, it increased the proportions of As and Cr (slightly) associated with the exchangeable and acid-soluble soil fractions, and the proportions of Cu and Cr (substantially) associated with the residual fraction.
热处理用于修复有机和无机污染物共存的土壤。它可以破坏有机污染物，但剩余的无机污染物需要进一步处理。本研究通过浸出试验、砷形态分析和连续提取程序，评估了热处理对 CCA 污染土壤中砷、铬和铜的迁移性、形态和化学分馏的影响。将土壤筛分成四个粒径（<0.125、0.125-0.250、0.250-0.500 和 0.500-1.0 mm），分别在 800°C 下处理，并与未处理的土壤进行比较分析。砷和铬的浸出率分别增加了 18-40 倍和 2-23 倍，而铜的迁移率在处理后降低了 12-14 倍。最细土壤粒径中孔隙水中的 As(V)浓度增加了 19 倍，而 As(III)的浓度保持不变。处理降低了与可还原土壤部分相关的砷、铬和铜。此外，它增加了与可交换和酸溶性土壤部分相关的砷和铬（略有）的比例，以及与残余部分相关的铜和铬（大量）的比例。
