Fuks Leon, Miśkiewicz Agnieszka, Herdzik-Koniecko Irena, Zakrzewska-Kołtuniewicz Grażyna
Centre for Radiochemistry and Nuclear Chemistry, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warszawa, Poland.
Membranes (Basel). 2023 May 31;13(6):572. doi: 10.3390/membranes13060572.
The paper deals with checking the possibility of using fly ash (FA) as a sorbent in the batch adsorption method of removing radionuclides from aqueous solutions. An adsorption-membrane filtration (AMF) hybrid process with a polyether sulfone ultrafiltration membrane with a pore size of 0.22 μm was also tested as an alternative to the commonly used column-mode technology. In the AMF method, metal ions are bound by the water-insoluble species prior to the membrane filtration of the purified water. Thanks to the easy separation of the metal-loaded sorbent, it is possible to improve water purification parameters using compact installations and reduce operating costs. This work evaluated the influence of such parameters on cationic radionuclide removal efficiency (EM): initial pH and composition of the solution, contact time of the phases, and the FA doses. A method for removing radionuclides, ordinarily present in an anionic form (e.g., TcO), from water, has also been presented. The results show, that both batch adsorption of radionuclides and adsorption-membrane filtration (AMF) using the FA as an adsorbent can be effectively used for water purification and in the form of a solid directed to long-term storage.
本文探讨了在从水溶液中去除放射性核素的间歇吸附法中使用粉煤灰（FA）作为吸附剂的可能性。还测试了一种采用孔径为0.22μm的聚醚砜超滤膜的吸附-膜过滤（AMF）混合工艺，作为常用柱模式技术的替代方法。在AMF方法中，金属离子在纯净水进行膜过滤之前被水不溶性物质结合。由于负载金属的吸附剂易于分离，因此可以使用紧凑的装置提高水净化参数并降低运营成本。这项工作评估了这些参数对阳离子放射性核素去除效率（EM）的影响：溶液的初始pH值和组成、各相的接触时间以及FA剂量。还提出了一种从水中去除通常以阴离子形式存在的放射性核素（例如TcO）的方法。结果表明，使用FA作为吸附剂的放射性核素间歇吸附和吸附-膜过滤（AMF）都可有效地用于水净化，并以固体形式用于长期储存。
