Kumpiene Jurate, Nordmark Désirée, Carabante Ivan, Sužiedelytė-Visockienė Jūratė, Aksamitauskas Vladislovas Česlovas
Waste Science and Technology, Luleå University of Technology, 971 87 Luleå, Sweden.
Waste Science and Technology, Luleå University of Technology, 971 87 Luleå, Sweden.
Chemosphere. 2017 Oct;184:13-19. doi: 10.1016/j.chemosphere.2017.05.140. Epub 2017 May 23.
The aim of this study was to evaluate the efficiency of a large scale washing/wet sieving technique for a soil contaminated with wood impregnation chemicals by 1) defining the final distribution of trace elements (As, Cu, Cr, Zn) and polycyclic aromatic hydrocarbons (PAH) in separated soil particle size fractions; and 2) defining the leaching behavior of the contaminants in these soil fractions. A soil washing experiment was implemented at waste management facility in Sweden using a full scale soil sorting and washing equipment. Five tons of soil was loaded to the equipment and wet-sieved into the following fractions: >16 mm, 8-16 mm, 2-8 mm, 0.2-2 mm, <0.2 mm and a fraction that floated on top of the slurry before the final separation phase, composed of organic matter (OM). Analysis of total concentrations of contaminants in all soil fractions indicated that wet sieving/soil washing was not efficient to reduce the total volume of soil that needs further treatment. Even the coarsest soil fractions (>8 mm) contained elevated concentrations of total As and PAH. Leaching of As from all washed soil fractions was so high, that none of the particle size fractions could be disposed of without additional treatment.
本研究的目的是通过以下方式评估大规模洗涤/湿筛技术对受木材浸渍化学品污染土壤的效率：1）确定微量元素（砷、铜、铬、锌）和多环芳烃（PAH）在分离出的土壤粒径级分中的最终分布；2）确定这些土壤级分中污染物的淋溶行为。在瑞典的一个废物管理设施中，使用全套土壤分选和洗涤设备进行了土壤洗涤实验。五吨土壤被装入设备并湿筛成以下级分：>16毫米、8 - 16毫米、2 - 8毫米、0.2 - 2毫米、<0.2毫米以及在最终分离阶段之前漂浮在泥浆顶部的由有机物（OM）组成的一个级分。对所有土壤级分中污染物总浓度的分析表明，湿筛/土壤洗涤对于减少需要进一步处理的土壤总体积并不有效。即使是最粗的土壤级分（>8毫米）中，总砷和多环芳烃的浓度也很高。所有洗涤后的土壤级分中砷的淋溶量都很高，以至于没有一个粒径级分在不进行额外处理的情况下能够被处置。
