Co-valorization of Food Waste and CO2 to Produce Volatile Fatty Acids Using Liter-Scale Tubular Microbial Electrosynthesis Cells

IF 7.4 Q1 ENGINEERING, ENVIRONMENTAL ACS ES&T engineering Pub Date : 2024-08-20 DOI:10.1021/acsestengg.4c00218
Yanhong Bian, Aaron M. Leininger, Weilan Zhang, Yanna Liang, Zhiyong Jason Ren
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Abstract

This study presents the simultaneous conversion of food waste and CO2 into volatile fatty acids (VFAs) using a 6 L tubular microbial electrosynthesis cell (MES). The MES reactor uses a bioanode to convert food waste into current and CO2, while on the cathode, H2 is produced and subsequently consumed by cathode microbes for the conversion of CO2 to VFAs. The study reveals that system performance is impacted by organic loading, applied voltage, and flow rate, and optimal operational conditions achieve a VFA titer of 1763 mg/L with the Coulombic efficiency (CE) exceeding 90% at the anode, highlighting efficient electron recovery from food waste. Resistance analysis indicates that the cathode contributed most to system resistance, while microbial community analysis shows a synergy between fermentative and electroactive bacteria in the anode and dominant acetogens in the cathode, facilitating efficient electron recovery and VFA synthesis, respectively. The research underscores the tubular MES’s potential for sustainable food waste treatment and CO2 valorization into valuable VFAs, contributing to waste management and greenhouse gas mitigation strategies.

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利用升级管式微生物电合成电池将厨余垃圾和二氧化碳共价生成挥发性脂肪酸
本研究介绍了利用 6 升管式微生物电合成池(MES)将食物垃圾和二氧化碳同时转化为挥发性脂肪酸(VFAs)的方法。MES 反应器使用生物阳极将食物垃圾转化为电流和 CO2,同时在阴极产生 H2,随后阴极微生物消耗 H2 将 CO2 转化为挥发性脂肪酸。研究表明,系统性能受有机负载、应用电压和流速的影响,最佳运行条件下的 VFA 滴度为 1763 毫克/升,阳极的库仑效率(CE)超过 90%,突出显示了从食物垃圾中回收电子的效率。阻力分析表明,阴极对系统阻力的影响最大,而微生物群落分析表明,阳极的发酵菌和电活性菌与阴极的优势醋酸菌之间存在协同作用,分别促进了高效电子回收和 VFA 合成。这项研究强调了管式 MES 在可持续食品废物处理和将二氧化碳转化为有价值的 VFA 方面的潜力,有助于废物管理和温室气体减排战略。
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ACS ES&T engineering
ACS ES&T engineering ENGINEERING, ENVIRONMENTAL-
CiteScore
8.50
自引率
0.00%
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0
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.
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