National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism, Tsukuba, Ibaraki, Japan.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2013;48(13):1717-22. doi: 10.1080/10934529.2013.815538.
The sewer systems of eastern Japan have transported radioactive fallout from the Fukushima Dai-ichi nuclear power plant accident to wastewater treatment plants, where the radioisotopes have accumulated. To better understand the potential problems associated with the disposal of contaminated sewage sludge in landfills, leachate tests were conducted with radioactive incinerator ash, cement solidification incinerator ash, and dewatered sludge cake. Radioactivity was undetectable in the eluate from incinerator ash and dewatered sludge cake, but about 30% of the radioactivity initially in cement solidification incinerator ash appeared in the eluate during the leaching experiments. Moreover, modification of test conditions revealed that the presence of Ca(2+) ions and strong alkali in the water that contacted the incinerator ash enhanced leaching of cesium. Lastly, the capacity of pit soil to absorb radioactive cesium was estimated to be at least 3.0 Bq/g (dry).
日本东部的下水道系统已经将福岛第一核电站事故产生的放射性沉降物输送到废水处理厂，放射性核素在那里积累。为了更好地了解在垃圾填埋场处理污染的污水污泥可能带来的问题，对放射性焚烧炉灰、水泥固化焚烧炉灰和脱水污泥饼进行了淋滤试验。在焚烧炉灰和脱水污泥饼的浸出液中未检测到放射性，但在浸出试验中，水泥固化焚烧炉灰中约 30%的初始放射性最初出现在浸出液中。此外，修改试验条件表明，与焚烧炉灰接触的水中 Ca(2+)离子和强碱的存在增强了铯的浸出。最后，坑土吸收放射性铯的能力估计至少为 3.0 Bq/g（干重）。
