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首页> 外文期刊>Biotechnology Progress >An Economic Comparison of Different Fermentation Configurations to Convert Corn Stover to Ethanol Using Z. mobilis and Saccharomyces
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An Economic Comparison of Different Fermentation Configurations to Convert Corn Stover to Ethanol Using Z. mobilis and Saccharomyces

机译：使用发酵发酵单胞菌和酿酒酵母将玉米秸秆转化为乙醇的不同发酵方式的经济比较

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Numerous routes are being explored to lower the cost of cellulosic ethanol production and enable large-scale production. One critical area is the development of robust cofermen-tative organisms to convert the multiple, mixed sugars found in biomass feedstocks to ethanol at high yields and titers without the need for processing to remove inhibitors. Until such microorganisms are commercialized, the challenge is to design processes that exploit the current microorganisms' strengths. This study explored various process configurations tailored to take advantage of the specific capabilities of three microorganisms, Z. mobilis 8b, S. cerevisiae, and S. pastorianus. A technoeconomic study, based on bench-scale experimental data generated by integrated process testing, was completed to understand the resulting costs of the different process configurations. The configurations included whole slurry fermentation with a coculture, and separate cellulose simultaneous saccharification and fermentation (SSF) and xylose fermentations with none, some or all of the water to the SSF replaced with the fermented liquor from the xylose fermentation. The difference between the highest and lowest ethanol cost for the different experimental process configurations studied was $0.27 per gallon ethanol. Separate fermentation of solid and liquor streams with recycle of fermented liquor to dilute the solids gave the lowest ethanol cost, primarily because this option achieved the highest concentrations of ethanol after fermentation. Further studies, using methods similar to ones employed here, can help understand and improve the performance and hence the economics of integrated processes involving enzymes and fermentative microorganisms.
机译：人们正在探索多种途径来降低纤维素乙醇的生产成本并实现大规模生产。一个关键领域是开发强大的协作生物，以高产率和高滴度将生物质原料中存在的多种混合糖转化为乙醇，而无需进行处理以去除抑制剂。在将此类微生物商业化之前，挑战在于设计利用当前微生物优势的工艺。这项研究探索了各种工艺配置，这些工艺经过配置可利用三种微生物运动发酵单胞菌8b，酿酒酵母和巴斯德酵母的特定功能。完成了一项技术经济研究，该研究基于通过集成过程测试生成的基准规模实验数据，以了解不同过程配置的最终成本。配置包括共培养的全浆液发酵，以及单独的纤维素同时糖化和发酵（SSF）和木糖发酵，无，部分或全部水的SSF被木糖发酵的发酵液代替。对于所研究的不同实验过程配置，最高和最低乙醇成本之间的差异为每加仑乙醇0.27美元。固体和液体物流的分离发酵与发酵液的循环以稀释固体产生的乙醇成本最低，这主要是因为该选项在发酵后获得了最高的乙醇浓度。使用与此处采用的方法相似的方法进行的进一步研究可以帮助您理解和改善其性能，从而提高涉及酶和发酵微生物的整合过程的经济性。

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