Abstract A new scheme for parallelization of microchannels for ion concentration polarization-based seawater desalination is proposed. In the proposed system, microchannels/micropores are paralleled only in ion-selective membrane region and all other parts are simply merged. A two-dimensional simulation model is developed to study performances of such a system, by calculating the salt removal ratio (SRR) and the average velocity of fluid, under varied working conditions. Our results show that SRR >98% for seawater salinity (realizing drinkable water) is achievable. It is found that a stronger cross membrane voltage strengthens electrokinetic flow of the second kind (EOF2) and increases both SRR and flow velocity. Increasing pressure promotes fluid flow but decrease SRR and EOF2 significantly when the ion depletion zone is destroyed. Volumetric energy consumption and energy per ion removal (EPIR) were also characterized under varied electric field and pressure conditions. Energy consumption as low as 12.82 kWh/m3 was realized to convert seawater (salinity ~500 mM) to the desalinated water (salinity ~10 mM) at a flow speed of 0.56 mm/s. The overall cost of water for such a process was estimated as 2.08 $/m3, which is competitive for small-scale desalination applications.

中文翻译：

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微孔选择性渗透膜电动脱盐数值模拟

摘要 提出了一种用于离子浓差极化海水淡化微通道并行化的新方案。在所提出的系统中，微通道/微孔仅在离子选择性膜区域平行，所有其他部分都简单地合并。通过计算不同工作条件下的除盐率 (SRR) 和流体平均速度，开发了二维仿真模型来研究此类系统的性能。我们的结果表明，海水盐度（实现饮用水）的 SRR > 98% 是可以实现的。发现更强的跨膜电压会增强第二类电动流动 (EOF2) 并增加 SRR 和流速。当离子耗尽区被破坏时，增加压力会促进流体流动，但会显着降低 SRR 和 EOF2。在不同的电场和压力条件下，还表征了体积能耗和每离子去除能量 (EPIR)。能耗低至 12.82 kWh/m3，以 0.56 mm/s 的流速将海水（盐度~500 mM）转化为淡化水（盐度~10 mM）。这种过程的水总成本估计为 2.08 美元/立方米，这对于小规模海水淡化应用具有竞争力。