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Influence of sulfate on anion exchange membranes in reverse electrodialysis
npj Clean Water ( IF 11.4 ) Pub Date : 2020-06-15 , DOI: 10.1038/s41545-020-0073-7
Diego Pintossi , Chieh-Li Chen , Michel Saakes , Kitty Nijmeijer , Zandrie Borneman

Reverse electrodialysis (RED) is a technology producing renewable energy from the mixing of river and seawater. In natural salinity gradients, multivalent ions are present, which lead to a reduced RED power output. Transport of multivalent ions against the concentration gradient and their trapping inside the membranes leads to a lower driving force and increased membrane resistance. The present work focuses on the effect of sulfate ions on anion exchange membranes in RED. A monovalent ion selective membrane ability to retain a higher open circuit voltage is offset by the higher resistance in the presence of sulfate, leading to losses in normalized power outputs (−25%) comparable to a standard grade membrane. Longer term experiments revealed that membrane resistance increases over time. This study highlights the need to address uphill transport, resistance increase, and decreased permselectivity of anion exchange membranes in presence of multivalent ions.



中文翻译:

硫酸盐对逆电渗析中阴离子交换膜的影响

反向电渗析(RED)是一种通过河流和海水的混合产生可再生能源的技术。在自然盐度梯度中,存在多价离子,这导致RED功率输出降低。反对浓度梯度的多价离子运输及其在膜内部的捕集导致较低的驱动力和增加的膜阻力。目前的工作集中在硫酸根离子对RED阴离子交换膜的影响。在存在硫酸盐的情况下,单价离子选择性膜能够保持较高的开路电压的能力被较高的电阻所抵消,从而导致标准化功率输出的损耗(-25%)可与标准级膜相比。长期实验表明,膜电阻随时间增加。这项研究强调了解决上坡运输的需求,

更新日期:2020-06-15
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