Microbial electrosynthesis: is it sustainable for bioproduction of acetic acid?
Microbial electrosynthesis: is it sustainable for bioproduction of acetic acid?
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DOI：
10.1039/d1ra00920f
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发表时间：
2021-03-05
期刊：
影响因子：
3.9
通讯作者：
Sadhukhan J
中科院分区：
文献类型：
--
作者：
Gadkari S;Mirza Beigi BH;Aryal N;Sadhukhan J
微生物电合成(MES)是一种将二氧化碳(CO2)电驱动微生物还原为有用的多碳化合物的创新技术。这项研究使用石墨烯功能化碳毡阴极评估了与MES生产醋酸(AA)相关的从摇篮到门的环境负担。分析表明，尽管与未经修饰的碳毡相比，功能化阴极的生产对环境的影响要高得多，但该工艺生产率的提高有助于降低总体影响。研究还表明，提取AA所需的能量是主要的环境热点，离子交换膜和反应介质(阴阳极)也是重要的贡献因素。文中还描述了四种不同情况下的灵敏度分析，分别考虑了连续操作和补料分批操作。结果表明，即使理论上MES的生产率可以提高到与连续气体发酵罐中产乙酸菌的最高时空产率(148g L−1 d−1)相匹配，使用MES系统生产的AA对环境的影响仍将显著高于使用化石工艺生产的AA。使用补料分批操作和可再生(太阳能)能源确实有助于减少影响，然而，生产率低和总体能源需求高使得大规模实施这类系统不切实际。分析建议，在MES被视为化石AA生产的可持续替代品之前，需要实现4100克−2 d−1的最低门槛产量。对使用微生物电合成的醋酸生产进行详细的生命周期评价研究，以探索这一过程可持续的情景。
Microbial electrosynthesis (MES) is an innovative technology for electricity driven microbial reduction of carbon dioxide (CO2) to useful multi-carbon compounds. This study assesses the cradle-to-gate environmental burdens associated with acetic acid (AA) production via MES using graphene functionalized carbon felt cathode. The analysis shows that, though the environmental impact for the production of the functionalized cathode is substantially higher when compared to carbon felt with no modification, the improved productivity of the process helps in reducing the overall impact. It is also shown that, while energy used for extraction of AA is the key environmental hotspot, ion-exchange membrane and reactor medium (catholyte & anolyte) are other important contributors. A sensitivity analysis, describing four different scenarios, considering either continuous or fed-batch operation, is also described. Results show that even if MES productivity can be theoretically increased to match the highest space time yield reported for acetogenic bacteria in a continuous gas fermenter (148 g L−1 d−1), the environmental impact of AA produced using MES systems would still be significantly higher than that produced using a fossil-based process. Use of fed-batch operation and renewable (solar) energy sources do help in reducing the impact, however, the low production rates and overall high energy requirement makes large-scale implementation of such systems impractical. The analysis suggests a minimum threshold production rate of 4100 g m−2 d−1, that needs to be achieved, before MES could be seen as a sustainable alternative to fossil-based AA production. Detailed LCA study of acetic acid production using microbial electrosynthesis to explore scenarios when this process could become sustainable.
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