数字农科院2.0

Unveiling the mechanism of comparative cathodic reactions on salt removal and electrochemical behavior in microbial desalination cell for high-strength wastewater

文献类型： 外文期刊

作者： Chongtao Liu;Ran Ju;Zhuangzhuang Liu;Yangyang Li;Ling Wang;Xiaomei Jiang;Bing Zeng;Houkai Wu;Xiuping Tao

作者机构：

关键词： Bioelectricity;Cathodic reaction;Desalination;Microbial desalination cell;Wastewater treatment

期刊名称： Results in Engineering

ISSN： 2590-1230

年卷期： 2025 年 27 卷

页码：

收录情况： EI（2025版） ; ; ESCI（2025版）

摘要： Cathodic reactions govern bioenergy recovery and sustainable desalination in microbial desalination cells (MDCs), yet direct comparative assessment of dominant catholytes (oxygen vs. ferricyanide) under identical operational conditions remains absent. In this study, a controlled side-by-side evaluation using parallel MDCs with oxygen or ferricyanide catholytes under equivalent operational settings was developed. The findings indicated that the ferricyanide-based MDC outperformed the air-cathode, with higher power density (2.45 W/m2), desalination efficiency (over 90%), and remarkable removal rate of chemical oxygen demand (94%) and ammonia nitrogen (99%) for high-load wastewater (2000 mg/L chemical oxygen demand). Electrode potential slope analysis showed higher power was due to larger experimental working potential (314 mV) of ferricyanide versus air-cathode (173 mV). Electrochemical behaviors revealed that ferricyanide not only reduced the charge transfer resistance for MDC, but also augmented the cathodic potential and electron transfer efficiency, possessing favorable cathodic reduction kinetics. Furthermore, anions migrated with greater priority than cations, which was attributed to the interplay of electric field and hydrated ionic radius. These findings elucidate kinetic-thermodynamic trade-offs in catholyte selection, providing actionable principles for scalable, energy-efficient MDC design.

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