在生物电化学系统中,低电流有助于从二氧化碳中生产乙醇,使用二氧化碳丰富的混合培养
Chaeho Im1, Minsoo Kim2, Jung Rae Kim2
1Division of Industrial Biotechnology, Department of Life Sciences, Chalmers University of Technology, Göteborg, Sweden.
Frontiers in microbiology
|September 13, 2024
概括
可再生资源对于缓解气候变化至关重要. 这项研究探讨了使用在生物电化学系统 (BES) 中富含CO的培养物来利用工业废气的CO电发酵,为传统方法提供了有希望的替代方案.
科学领域:
- 环境科学与工程环境科学与工程
- 生物技术是生物技术.
- 可再生能源可再生能源是可再生能源.
背景情况:
- 化石燃料的依赖需要向可再生资源过渡,以应对气候变化并减少温室气体排放.
- 使用生物电化学系统 (BES) 的电发酵提供了一种利用废物流的方法.
- 目前对基于二氧化碳的微生物电合成的研究面临着缓慢的生产速度和低代谢物标位的挑战,这阻碍了实际应用.
研究的目的:
- 为了研究一氧化碳 (CO) 和二氧化碳 (CO2) 电气发酵的可行性,使用CO丰富的微生物培养.
- 评估利用工业废气 (CO) 作为BES中的原料的潜力.
- 为了评估在不同应用电流下酸盐和乙醇的生产.
主要方法:
- 在50%的CO和20%的CO2气氛下,从新鲜奶牛便废物中丰富使用CO的微生物培养物.
- 在BES反应堆中培养由Clostridium autoethanogenum主导的丰富培养物,使用CO2散射和10mA和25mA电流.
- 分析乙酸和乙醇生产,库伦比效率和光密度 (OD),以评估系统性能.
主要成果:
- 在10mA的应用电流中,50%的CO和20%的CO2,乙酸和乙醇分别在12.9±2.7mM和2.7±1.1mM的电流下产生,其库伦比效率为148%±8%.
- 在25mA时,观察到更快的初始生长和酸盐生产,但没有产生乙醇,并降低到86%±4%的库伦比效率.
- 最大OD值为0.29±0.07在10mA和0.41±0.03在25mA,而没有电流则为0.77±0.19.
结论:
- 使用富含CO的培养物在BES中的CO电发酵是利用工业废气的可行替代方案.
- 低电流可以支持从含有二氧化碳的废物流中生产酸盐和乙醇等有价值的化学物质.
- 这种方法为可持续化学品生产和废物管理提供了一个有希望的途径.
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