Synergistic energy-water treatment enhancement in taper ceramic cathode microbial fuel cell coupled constructed wetland: Regulation mechanisms of electrical conditions and feeding manners

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-07-09 DOI:10.1016/j.cej.2025.165843

Cheng Tang, Yaqian Zhao, Chun Kang

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Abstract

This study comprehensively investigates a novel taper ceramic cathode-based microbial fuel cell-constructed wetland (MFC-CW) system under diverse electrical conditions and feeding manners. The cathode, featuring a self-stabilizing ceramic pot integrated with carbon felt and activated carbon, significantly reduced internal resistance (minimum 156 Ω) while sustaining high open-circuit voltages (>565 mV) through enhanced oxygen diffusion and proton transfer while maintaining ion conductivity. Key findings demonstrate that continuous feeding mode outperformed batch operation in both pollutant removal and bioelectricity generation due to stable hydraulic conditions promoting proton migration. Optimal performance was achieved at an external resistance of 220 Ω, balancing power output (peak power output: 959.16 μW with scattered anodes) and nitrogen removal enhancement (48.68 % of TN). MFC-CW with anode consist of stainless steel mesh (SSM) cage filled with charcoal or graphite maximized COD removal (up to 224.17 mg/L) and voltage generation (597.85 mV). The system's scalability was validated through multi-anode configurations, with scattered anodes increasing power output by leveraging reduced electrode spacing. This work establishes operational guidelines for synchronizing wastewater treatment performance and bioelectricity production, highlighting the ceramic cathode's critical role in advancing sustainable MFC-CW applications.

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锥形陶瓷阴极微生物燃料电池耦合人工湿地的协同能水处理强化：电条件和投料方式的调节机制

本研究全面研究了一种基于锥形陶瓷阴极的新型微生物燃料电池-人工湿地（MFC-CW）系统在不同电气条件和投料方式下的性能。阴极采用自稳定陶瓷罐，集成了碳毛料和活性炭，显著降低内阻（最小156 Ω），同时通过增强氧扩散和质子转移维持高开路电压（>565 mV），同时保持离子电导率。主要研究结果表明，由于稳定的水力条件促进质子迁移，连续加料模式在污染物去除和生物发电方面都优于批量操作。当外阻为220 Ω、输出功率为959.16 μW（分散阳极时峰值输出功率为959.16 μW）和除氮增强（TN的48.68 %）时，性能达到最佳。带有阳极的MFC-CW由不锈钢网（SSM）笼填充木炭或石墨最大COD去除（高达224.17 mg/L）和电压产生（597.85 mV）。通过多阳极配置验证了系统的可扩展性，分散的阳极通过减小电极间距来提高功率输出。这项工作建立了同步废水处理性能和生物电生产的操作指南，突出了陶瓷阴极在推进可持续MFC-CW应用中的关键作用。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.