Competitive migration behaviors of multiple ions and their impacts on ion-exchange resin packed microbial desalination cell

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• 作者：Kuichang Zuo ; Lulu Yuan ; Jincheng Wei ; Peng Liang ; Xia Huang
• 关键词：Microbial desalination cell ; Ion-exchange resin ; Multiple ions ; Migration behavior ; Scaling
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：146
• 期：Complete
• 页码：637-642
• 全文大小：838 K

文摘

Mixed ion-exchange resins packed microbial desalination cell (R-MDC) could stabilize the internal resistance, however, the impacts of multiple ions on R-MDC performance was unclear. This study investigated the desalination performance, multiple ions migration behaviors and their impacts on R-MDCs fed with salt solution containing multiple anions and cations. Results showed that R-MDC removed multiple anions better than multiple cations with desalination efficiency of 99 % (effluent conductivity <0.05 ms/cm) at hydraulic retention time of 50 h. Competitive migration order was  >  > Cl^? for anions and Ca²⁺ ¡Ö Mg²⁺ >  > Na⁺ for cations, jointly affected by both their molar conductivity and exchange selectivity on resins. After long-term operation, the existence of higher concentration Ca²⁺ and Mg²⁺ caused the electric conductivity of mixed resins decrease and scaling on the surface of cation-exchange membrane adjoined with cathode chamber, suggesting that R-MDC would be more suitable for desalination of water with lower hardness.