Competitive migration behaviors of multiple ions and their impacts on ion-exchange resin packed microbial desalination cell.
Competitive migration behaviors of multiple ions and their impacts on ion-exchange resin packed microbial desalination cell.
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DOI：
10.1016/j.biortech.2013.07.139
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发表时间：
2013-10
影响因子：
11.4
通讯作者：
Kuichang Zuo;Lulu Yuan;Jincheng Wei;P. Liang;Xia Huang
中科院分区：
文献类型：
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作者：
Kuichang Zuo;Lulu Yuan;Jincheng Wei;P. Liang;Xia Huang
混合离子交换树脂填充的微生物脱盐电池（R-MDC）可以稳定电池的内阻，但多种离子对R-MDC性能的影响尚不清楚。研究了含多种阴、阳离子的盐溶液对R-MDC的脱盐性能、多种离子迁移行为及其影响。结果表明，R-MDC对多种阴离子的去除效果优于对多种阳离子的去除效果，在水力停留时间为50 h时，脱盐率可达99%（出水电导率< 0.05 ms/cm）。阴离子的竞争迁移顺序为SO 4 2-> NO 3-> Cl-，阳离子的竞争迁移顺序为Ca 2+≈ Mg 2+> NH 4+> Na+，这受到它们的摩尔电导率和树脂交换选择性的共同影响。长期运行后，较高浓度的Ca 2+、Mg 2+的存在导致混合树脂电导率下降，与阴极室相邻的阳离子交换膜表面结垢，表明R-MDC更适合于低硬度水的脱盐。
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 SO 4 2-> NO 3-> Cl− for anions and Ca 2+≈ Mg 2+> NH 4+> Na+ for cations, jointly affected by both their molar conductivity and exchange selectivity on resins. After long-term operation, the existence of higher concentration Ca 2+ and Mg 2+ 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.