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Model based investigation of the potential lactate recovery using electro-enhanced dialysis—Static analysis

机译:基于模型的电渗析法对乳酸潜在回收率的研究-静态分析

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摘要

The competitive ion transport through anion exchange membranes under current load conditions, referred to as the electro-enhanced dialysis process, is modeled and investigated through simulations. A dynamic model has been developed for simultaneous transport of multiple ions based on the Nernst-Plank equation. This model accounts for the convective transport of the dissociated and undis-sociated species in the module channels, and the diffusion and migration across the boundary layers and membranes. The potential static flux enhancement is evaluated and compared to Donnan dialysis operation for lactate recovery, where lactate fluxes were increased up to 230%. The effect of the imposed current on the concentration profiles is analyzed. Furthermore, the current saturation condition is investigated for the proposed electro-enhanced dialysis system. Thus, the operating window for current density and inlet hydroxide concentration was defined.
机译:通过模拟对在当前负载条件下通过阴离子交换膜的竞争性离子迁移(称为电渗析过程)进行建模和研究。已经基于能斯特-普朗克方程开发了用于同时传输多个离子的动力学模型。该模型考虑了模块通道中解离和未解离物种的对流传输,以及边界层和膜的扩散和迁移。对潜在的静态通量增强进行评估,并将其与Donnan透析操作进行乳酸回收,将乳酸通量提高至230%。分析了施加电流对浓度分布的影响。此外,针对提出的电增强透析系统研究了电流饱和条件。因此,确定了电流密度和入口氢氧化物浓度的操作窗口。

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