Abstract
The bipolar membrane electrodialysis (BMED) possesses the capability of green and efficient recovery of salt resources and alkali production, making it suitable for coupling with seawater utilization and CO2 absorption-mineralization processes. In order to reveal the process control mechanism and dynamic equilibrium, the imperative arises to construct a transport-reaction differential model. The overall process is subdivided into distinct modules: mass transport, reaction, electrical, and tank, with the aim of streamlining this intricate coupling procedure. Based on the Nernst-Planck model and combined with semi-empirical models, the models for each module were constructed, and differential equations were used for model integration. This approach addresses the complexity of multiphase reactions and mass transport processes that are challenging to describe through mathematical models. This model can predict indicators such as decalcification rate, carbon fixation rate, and energy consumption, and the accuracy of these results under various conditions was thoroughly verified through experimental data. This study is expected to provide guidance for the modeling of membrane process coupling.
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