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Study on separation and recovery of simulated wastewater containing 
vanadium (Ⅴ) and chromium (Ⅵ) ions via electrodialysis technology
Authors： HE Qingtai, WANG Zhanquan, LI Ruiqi, CHEN Liang, 
LI Jinchao, ZHANG Yaping 
Units： School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China
KeyWords： electrodialysis; cation exchange membrane; wastewater containing vanadium (Ⅴ) and chromium (Ⅵ) ions; separation and recovery
ClassificationCode：TQ151.7
year,volume(issue):pagination： 2026, 46(4):105-112

Abstract：

 In the traditional production process of V2O5 via sodium roasting-water leaching and precipitation, the wastewater post precipitation still contains a certain amount of vanadium (Ⅴ) and chromium (Ⅵ) ions. Treating this wastewater is imperative for environmental protection and resource recovery. This study employed a two-compartment cation-exchange membrane electrodialysis technology to treat 150 mL of simulated wastewater containing 250 mg/L vanadium  (Ⅴ) ions mixed with 250 mg/L chromium (Ⅵ) ions. The effects of current density, initial feed solution pH, flow rate, and electrodialysis time were systematically investigated. Under the optimal conditions (current density: 15 mA/cm2; initial feed pH: 1.9; flow rate: 25 mL/min; electrodialysis time: 17 h), the separation efficiencies of vanadium and chromium achieved 93.69% and 7.12% respectively, with the separation coefficient of 193.8 and the average energy consumption of merely 0.35 kW·h/g. Extending the electrodialysis to 30 h increased the separation efficiencies of vanadium and chromium to 98.18% and 14.16%, respectively, with the maximum separation coefficient of 327.5 and the average energy consumption of 0.61 kW·h/g. The V2O5 product with the purity of 98.3% was obtained after oxidization, precipitation, filtration and heating of the concentrate solution. These findings indicate that the two-compartment cation exchange membrane electrodialysis technology demonstrates strong potential to separate and recover the wastewater containing vanadium(V) and chromium (Ⅵ) ions. 

Funds：

四川省杰出青年科技人才项目 (2024NSFJQ0063)

AuthorIntro：
何青泰（1997-），男，四川巴中人，硕士研究生，主要研究方向为水处理. *通讯作者，李劲超，E-mail：lijinchao@swust.edu.cn；张亚萍，E-mail：zhangyaping@swust.edu.cn

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