纳滤膜过滤多组分离子电解质溶液的模型与计算——Ⅱ模拟计算

Model and Calculation of Nanofiltration Membrane in Filtrating Multi-component Electrolyte Solutions ——Ⅱ Simulation

以扩展的Nernst-Planck方程在膜微孔内浓度梯度微分方程和解膜微孔内浓度梯度微分方程的有关参数和方程为基础,研究了聚酰胺纳滤膜DK2540过滤多组分电解质溶液的分离特性。结果显示,在多组分电解质溶液中,Donnan电位和溶剂化能决定了纳滤模型中的传递方程和分离系数;多离子组分(至少9种离子)的矿山酸性废水的纳滤过程描述有许多不足之处,还应进一步改进。

In this work, on the basis of the extended Nernst-Planck equation, the ion concentration gradient differential equation in membrane mleropore solutions and a series of relevant parameters obtained by solving those equations, the separation characteristics of the nanofihration （NF） membranes DK2540 for multi-component electrolyte solutions has been investigated. The results showed that, in the multi-component electrolyte solutions, the transport equation and separation coefficient based on the NF model were determined by the Donnan potentials and the solvent energy, and the description of the NF process containing multi-ionic component （at least 9） mine acidic wastewater still have some disadvantages, and still need to be further improved.