Volume Reduction of Municipal Solid Wastes Contaminated with Radioactive Cesium by Ferrocyanide Coprecipitation Technique
Volume Reduction of Municipal Solid Wastes Contaminated with Radioactive Cesium by Ferrocyanide Coprecipitation Technique
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DOI：
10.1007/978-4-431-55111-9_29
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Y. Fujikawa;H. Ozaki;H. Tsuno;Peng-fei Wei;Aiichiro Fujinaga;R. Takanami;S. Taniguchi;S. Kimura;R. R. Giri-R.;Paul Lewtas
中科院分区：
文献类型：
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作者：
Y. Fujikawa;H. Ozaki;H. Tsuno;Peng-fei Wei;Aiichiro Fujinaga;R. Takanami;S. Taniguchi;S. Kimura;R. R. Giri-R.;Paul Lewtas
福岛第一核电站（以下简称 F1）事故发生后，日本部分地区产生了放射性铯（rad-Cs）浓度升高的城市固体废物（MSW）。受污染城市生活垃圾的回收和最终处置已成为受影响地区的一个难题，导致处理设施中处理残渣的堆积。城市生活垃圾中的rad-Cs，特别是粉煤灰，往往表现出较高的浸出率。用水或热草酸提取受污染的城市固体废物，然后使用亚铁氰化物（以下简称 Fer）共沉淀技术从提取物中选择性去除 rad-Cs，可能是减少废物体积的最终解决方案。城市固体废弃物提取物含有各种金属成分以及草酸等螯合剂，并且通常含盐量很高。提取物的成分根据废物来源、应用的处理技术和rad-Cs提取方法等的不同而有很大差异。Fer共沉淀技术的适用性必须经过测试和验证才能应用于实际处理。在这项工作中，我们应用 Fer 技术并观察了从未污染区域收集的各种城市固体废物样品的水和草酸提取物（均添加了 rad-Cs 示踪剂或稳定 Cs）中铯 (Cs) 的去除情况。最后，现场应用 Fer 技术去除提取物中的 rad-Cs。
Municipal solid wastes (MSW) with elevated concentrations of radioactive cesium (rad-Cs hereafter) have been generated in some areas of Japan in the aftermath of the Fukushima Daiichi Nuclear Power Plant (F1 hereafter) accident. Both recycling and final disposal of the contaminated MSW have become a difficult problem in the affected areas, resulting in accumulation of treated residues in the treatment facilities.The rad-Cs in MSW, especially fly ash, often showed a high leaching rate. Extraction of contaminated MSW with water or hot oxalic acid followed by selective removal of rad-Cs from the extract using ferrocyanide (Fer hereafter) coprecipitation technique could be an ultimate solution for waste volume reduction. The MSW extracts contain various metal components as well as chelating reagents like oxalic acid, and are often very saline. The composition of the extract varies widely depending on waste sources, applied treatment techniques, and rad-Cs extraction method etc. The applicability of the Fer coprecipitation technique had to be tested and validated before it could be applied for actual treatment. In this work, we applied the Fer technique and observed removal of cesium (Cs) from water and oxalic acid extracts (all spiked with rad-Cs tracer or stable Cs) of various MSW samples collected from uncontaminated areas. Finally, the Fer technique was applied on site for removal of rad-Cs in the extracts of