Enhanced Medium-Chain Fatty Acids Production by Electro-fermentation: Insights into the Effect of Biocathode and Ethanol Supply

IF 7.4 Q1 ENGINEERING, ENVIRONMENTAL

ACS ES&T engineering Pub Date : 2024-10-18 DOI:10.1021/acsestengg.4c0048810.1021/acsestengg.4c00488

Xiaoyan Sun, Yanan Yin*, Hui Chen, Lei Zhao, Cheng Wang and Jianlong Wang,

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Abstract

This study explored the enhanced medium-chain fatty acids (MCFA) production by introducing a biocathode as a coelectron donor (ED) in the presence of different ethanol/acetate ratios (R_E/A). Results showed that the introduction of a biocathode effectively promoted MCFA production by 165%–749%. The highest promotion rate was achieved at R_E/A = 0:3, and the highest MCFA concentration of 305.1 mmol C/L was obtained at R_E/A = 2:1. Besides, the introduction of a biocathode also triggered the formation of longer-chain MCFA (i.e., caprylate), and caprylate production was increased with the increase of R_E/A. Electrochemical analyses exhibited a positive correlation between the electrochemical activity and R_E/A. Microbiological analyses showed that the introduction of a biocathode promoted MCFA production by enriching chain elongation functional microorganisms (unclassified_f_Neisseriaceae sp. and Clostridium_sensu_stricto_12 sp.) and electrochemically active bacteria (Alcaligenes sp.). Enzyme analyses indicated that promoted MCFA production was achieved by strengthening the acetyl Co-A formation and fatty acid biosynthesis pathway.

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来源期刊

ACS ES&T engineering ENGINEERING, ENVIRONMENTAL-

CiteScore

8.50

自引率

0.00%

发文量

期刊介绍： ACS ES&T Engineering publishes impactful research and review articles across all realms of environmental technology and engineering, employing a rigorous peer-review process. As a specialized journal, it aims to provide an international platform for research and innovation, inviting contributions on materials technologies, processes, data analytics, and engineering systems that can effectively manage, protect, and remediate air, water, and soil quality, as well as treat wastes and recover resources. The journal encourages research that supports informed decision-making within complex engineered systems and is grounded in mechanistic science and analytics, describing intricate environmental engineering systems. It considers papers presenting novel advancements, spanning from laboratory discovery to field-based application. However, case or demonstration studies lacking significant scientific advancements and technological innovations are not within its scope. Contributions containing experimental and/or theoretical methods, rooted in engineering principles and integrated with knowledge from other disciplines, are welcomed.