Enhanced carbon capture and medium chain fatty acid production using microbial electrosynthesis: Role of electrode surface area

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-07-01 DOI:10.1016/j.biortech.2025.132916

Narnepati Krishna Chaitanya , Akanksha Rajpurohit , Pavithra S. Nair , Pritha Chatterjee

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Abstract

Balancing the surface area of electrodes to reactor volume (SA/V) ratio in microbial electrosynthesis (MES) systems is crucial for enhancing electron transfer, biofilm development, and product yield. Batch MES experiments were conducted using cathodes with SA/V ratios of 40 cm² L⁻¹ (MES-1), 150 cm² L⁻¹ (MES-2), 260 cm² L⁻¹ (MES-3) and 333 cm² L⁻¹ (MES-4), selected based on statistical analysis of previous studies. Among these, MES-3 (260 cm² L⁻¹) demonstrated the highest caproic acid production of 1.5 ± 0.2 g L⁻¹ and selectivity 67 %, outperforming MES-1, MES-2, and MES-4 by 2.1, 1.4, and 4.4 times, respectively. MES-3 had improved mass and electron transfer while maintaining effective microbe-electrode interactions. Additionally, MES-3 showed the lowest energy consumption (6.5 ± 2.3 kWh mol⁻¹ VFAs) and a higher electron recovery efficiency (55.8 ± 18.3 % at 2.5 V). These results demonstrate that balancing SA/V ratio is key to enhancing MES performance and sustainable MCFA production.

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利用微生物电合成增强碳捕获和中链脂肪酸生产：电极表面积的作用

在微生物电合成（MES）系统中，平衡电极表面积与反应器体积（SA/V）比对于提高电子传递、生物膜发育和产品收率至关重要。采用SA/V比分别为40 cm2 L−1 （MES-1）、150 cm2 L−1 （MES-2）、260 cm2 L−1 （MES-3）和333 cm2 L−1 （MES-4）的阴极进行批量MES实验。其中，MES-3 （260 cm2 L−1）的己酸产量最高，为1.5±0.2 g L−1，选择性为67%，分别是MES-1、MES-2和MES-4的2.1倍、1.4倍和4.4倍。MES-3改善了质量和电子传递，同时保持了有效的微生物-电极相互作用。此外，MES-3具有最低的能量消耗（6.5±2.3 kWh mol−1 VFAs）和较高的电子回收率（在2.5 V时为55.8±18.3%）。这些结果表明，平衡SA/V比率是提高MES性能和可持续MCFA生产的关键。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.