Bench scale percolation tests on radioactive Cs-contaminated soil in Fukushima and soil modified with water-absorbing polymer agent
Bench scale percolation tests on radioactive Cs-contaminated soil in Fukushima and soil modified with water-absorbing polymer agent
复制标题
福岛放射性Cs污染土壤及吸水聚合物改性土壤台架渗滤试验
DOI：
10.1016/j.sandf.2022.101237
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发表时间：
2022
影响因子：
3.7
通讯作者：
Arai Hiroyuki
中科院分区：
文献类型：
--
作者：
Mo Jialin;Endo Kazuto;Miura Takuya;Arai Hiroyuki
目前正在考虑将福岛净化项目产生的除去的土壤作为建设堤防的再生材料进行再利用，以便减少用于最终处置的土壤体积。在福岛使用含有吸水聚合物的药剂来修饰去除的土壤，以提高外来物质的分离效率，并提高处理的便利性。由于含有机吸水材料（如高吸水性聚合物）的改性土在岩土工程领域的回用比较少见，因此有必要研究改性剂对渗滤液质量的影响，以确保回用工程的环境安全。因此，在本研究中，进行了实验规模的渗透试验，以检查去除土壤的渗滤液质量在含有高吸水性聚合物的剂改性和未改性的情况下的变化。试验持续950天以上（液固比大于10）。移土渗滤液中137cs峰值浓度为8.6 Bq/L，累积浸出率为0.243%。与吸水率为3%的聚合物剂混合后，改性土壤中137cs的浸出率降低了60%。土壤改良后，K+和氨氮（NH4+-N）的淋溶量分别降低了40%和60%，而溶解有机碳在初始阶段的累积淋溶量提高了60%。从改良土壤中收集的渗滤液总量比从去除土壤中收集的渗滤液总量低4%。
The reuse of removed soil generated from decontamination projects in Fukushima as a recycled material for the construction of embankments has been under consideration for the sake of reducing the volume of this soil for its final disposal. Agents containing water-absorbing polymers are used in Fukushima to modify the removed soil in order to increase the separation efficiency of foreign materials and to improve the easiness of handling. As the reuse of modified soil containing organic water-absorbing materials, such as a superabsorbent polymer, is rather rare in the geotechnical field, it necessitates an investigation into the impact of the modifying agent on the leachate quality to ensure the environmental safety of the recycling project. In this study, therefore, bench scale percolation tests were conducted to examine the changes in the leachate quality of the removed soil with and without modification by an agent containing a superabsorbent polymer. The tests lasted for more than 950 days (liquid/solid ratio of over 10). The peak137Cs concentration in the leachate from the removed soil was 8.6 Bq/L and the accumulated leaching ratio was 0.243 %. The leaching of137Cs from the modified soil decreased by 60 % after mixing the removed soil with a 3 % water-absorbing polymer agent. The leaching of K+and ammonia nitrogen (NH4+-N) was 40 % and 60 % lower, respectively, after the soil modification, while the accumulated amount of leaching of the dissolved organic carbon in the initial stage was 60 % higher. The total leachate amount collected from the modified soil was 4 % lower than that collected from the removed soil.
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DOI：
10.2473/shigentosozai.119.155
发表时间：
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期刊：
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DOI：
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发表时间：
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期刊：
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影响因子：
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