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Quantifying the kinetics-energetics performance tradeoff in bipolar membrane electrodialysis
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.memsci.2020.118279
Huixia Lu , Li Wang , Ryszard Wycisk , Peter N. Pintauro , Shihong Lin

Abstract Bipolar membrane electrodialysis (BMED) is a promising, cost-effective technology for treating highly saline wastewater toward zero-liquid-discharge. Instead of producing low-value minerals of sodium chloride and sulfate, BMED can produce a valuable concentrated acid and base for industrial reuse. In this study, we first develop a numerical model to describe the mass transfer and energy consumption of a BMED process. We then present a systematic framework based on performance tradeoff curves for evaluating the performance of a BMED process that captures the inherent tradeoff between energy efficiency and the kinetic rate of the process. Such a performance tradeoff provides the technical basis for comparison between different BMED operations and systems and for technoeconomic analysis. Using such a framework and Na2SO4 as a model feed solution, we evaluate the impacts of initial feed concentration, target concentration of NaOH, and the ratio between the initial volumes of feed and seed base solutions on the BMED performance. Finally, we also demonstrate that a novel 3D junction bipolar membrane can enhance the performance of the BMED process.

中文翻译:

量化双极膜电渗析中的动力学-能量学性能权衡

摘要 双极膜电渗析 (BMED) 是一种用于处理高盐废水以实现零液体排放的有前途的、具有成本效益的技术。BMED 无需生产低价值的氯化钠和硫酸盐矿物,而是可以生产有价值的浓酸和碱以供工业再利用。在这项研究中,我们首先开发了一个数值模型来描述 BMED 过程的传质和能耗。然后,我们提出了一个基于性能权衡曲线的系统框架,用于评估 BMED 过程的性能,该过程捕获了能量效率和过程动力学速率之间的固有权衡。这种性能权衡为不同 BMED 操作和系统之间的比较以及技术经济分析提供了技术基础。使用这样的框架和 Na2SO4 作为模型进料溶液,我们评估了初始进料浓度、NaOH 目标浓度以及进料和种子基础溶液初始体积之间的比率对 BMED 性能的影响。最后,我们还证明了新型 3D 连接双极膜​​可以提高 BMED 工艺的性能。
更新日期:2020-10-01
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