Quantifying the kinetics-energetics performance tradeoff in bipolar membrane electrodialysis
Quantifying the kinetics-energetics performance tradeoff in bipolar membrane electrodialysis
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DOI：
10.1016/j.memsci.2020.118279
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发表时间：
2020-10-15
影响因子：
9.5
通讯作者：
Lin, Shihong
中科院分区：
文献类型：
--
作者：
Lu, Huixia;Wang, Li;Lin, Shihong
双极膜电渗析（BMED）是一种很有前途的、经济高效的处理高盐废水的技术。代替生产低价值的氯化钠和硫酸盐矿物，BMED可以生产有价值的浓酸和浓碱用于工业再利用。在这项研究中，我们首先建立了一个数值模型来描述BMED过程的传质和能量消耗。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，该过程捕获了能源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。在此框架下，以Na2SO4作为模型饲料溶液，我们评估了初始饲料浓度、NaOH目标浓度以及初始饲料体积与种子基溶液体积之比对BMED性能的影响。最后，我们还证明了一种新的三维结双极膜可以提高BMED过程的性能。
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.