电渗析
废水
水溶液
萃取(化学)
原材料
工艺工程
材料科学
化学
制浆造纸工业
膜
环境科学
色谱法
环境工程
工程类
生物化学
物理化学
有机化学
作者
Changbai Li,Deepika Lakshmi Ramasamy,Mika Sillanpää,Eveliina Repo
标识
DOI:10.1016/j.seppur.2020.117442
摘要
Rare earth elements (REEs) including Scandium (Sc) are critical raw materials which are greatly needed in the advancement of many modern technologies. Due to the problems associated with the primary extraction of mining ores, the procurement of Sc and REEs from the secondary resources are currently explored adopting the principle of sustainability and circular economy. Herein, for the first time, the Electrodialysis (ED) technology based on electrochemical membrane separation process is successfully applied to separate and concentrate REEs from the diluted aqueous system. The overall performance of ED process in the recovery of Sc3+ ions from the wastewater was assessed by applied current, voltage, feed concentration, feed pH, co-ion competition and the overall energy consumption of the process. The REE recovery using the ED process was subjected to systematic investigations using both chronopotentiometric and chronoamperometric analyses. The results showed that ED process could be very promising in the recovery of Sc3+ ions (~99.52% removal) from the diluted wastewater, consuming the energy of only 0.26 kWh/m3 when operated at constant voltage mode (Sc3+ concentration of 20 ppm, pH 4, 1 h).
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