A directional electrode separator improves anodic biofilm current density in a well-mixed single-chamber bioelectrochemical system

IF 3.4 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Enzyme and Microbial Technology Pub Date : 2024-08-22 DOI:10.1016/j.enzmictec.2024.110502

Md Monzurul Islam Anoy , Eric Allen Hill , Marci Ranae Garcia , Won-Jun Kim , Alexander S. Beliaev , Haluk Beyenal

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Abstract

In this study, a directional electrode separator (DES) was designed and incorporated into a single-chamber bioelectrochemical system (BES) to reduce migration and reoxidation of hydrogen. This issue arises when H₂, generated at the cathode, travels to the anode where anodic biofilms use H₂. To test the feasibility of our design, a 3D-printed BES reactor equipped with a DES was inoculated with anaerobic digestor granules and operated under fed-batch conditions using fermented corn stover effluent. The DES equipped reactor achieved significantly higher current densities (∼53 A/m²) compared to a conventional single-chamber BES without a separator (∼16 A/m²), showing a 3.3 times improvement. Control abiotic electrochemical experiments revealed that the DES exhibited significantly higher proton conductivity (456±127 µS/mm) compared to a proton exchange membrane (67±21 µS/mm) with a statistical significance of P=0.03. The DES also effectively reduced H₂ migration to the anode by 21-fold relative to the control. Overall, incorporating a DES in a single-chamber BES enhanced anodic current density by reducing H₂ migration to the anode.

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定向电极分离器可提高混合良好的单室生物电化学系统中的阳极生物膜电流密度

本研究设计了一种定向电极分离器 (DES)，并将其纳入单室生物电化学系统 (BES)，以减少氢气的迁移和再氧化。当阴极产生的 H2 流向阳极，阳极生物膜使用 H2 时，就会产生这个问题。为了测试我们设计的可行性，我们在一个配备了 DES 的 3D 打印 BES 反应器中接种了厌氧消化颗粒，并使用发酵的玉米秸秆污水在喂料批次条件下运行。与不带分离器的传统单室 BES（∼16 A/m²）相比，配备 DES 的反应器实现了更高的电流密度（∼53 A/m²），提高了 3.3 倍。对照非生物电化学实验显示，与质子交换膜（67±21 µS/mm）相比，DES 的质子电导率（456±127 µS/mm）明显更高，统计显著性为 P=0.03。与对照组相比，DES 还有效地减少了 H2 向阳极的迁移 21 倍。总之，在单室 BES 中加入 DES 可减少 H2 向阳极的迁移，从而提高阳极电流密度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Enzyme and Microbial Technology 生物-生物工程与应用微生物

CiteScore

7.60

自引率

5.90%

发文量

142

审稿时长

38 days

期刊介绍： Enzyme and Microbial Technology is an international, peer-reviewed journal publishing original research and reviews, of biotechnological significance and novelty, on basic and applied aspects of the science and technology of processes involving the use of enzymes, micro-organisms, animal cells and plant cells. We especially encourage submissions on: Biocatalysis and the use of Directed Evolution in Synthetic Biology and Biotechnology Biotechnological Production of New Bioactive Molecules, Biomaterials, Biopharmaceuticals, and Biofuels New Imaging Techniques and Biosensors, especially as applicable to Healthcare and Systems Biology New Biotechnological Approaches in Genomics, Proteomics and Metabolomics Metabolic Engineering, Biomolecular Engineering and Nanobiotechnology Manuscripts which report isolation, purification, immobilization or utilization of organisms or enzymes which are already well-described in the literature are not suitable for publication in EMT, unless their primary purpose is to report significant new findings or approaches which are of broad biotechnological importance. Similarly, manuscripts which report optimization studies on well-established processes are inappropriate. EMT does not accept papers dealing with mathematical modeling unless they report significant, new experimental data.