数字农科院2.0

Economic co-production of cellulosic ethanol and microalgal biomass through efficient fixation of fermentation carbon dioxide

文献类型： 外文期刊

作者： Liu L.;Zhou Z.;Gong G.;Wu B.;Todhanakasem T.;Li J.;Zhuang Y.;He M.

作者机构：

关键词： Algal biomass;Bioethanol;Biogas slurry wastewater;Circular bioeconomy;CO2 fixation

期刊名称： Bioresource Technology

ISSN： 0960-8524

年卷期： 2024 年 396 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： An integrated process for the co-production of cellulosic ethanol and microalgal biomass by fixing CO2 generated from bioethanol fermentation is proposed. Specifically, over one-fifth of the fermentative carbon was converted into high-purity CO2 during ethanol production. The optimal concentration of 4 % CO2 was identified for the growth and metabolism of Chlorella sp. BWY-1. A multiple short-term intermittent CO2 supply system was established to efficiently fix and recycle the waste CO2. Using this system, economical co-production of cellulosic ethanol by Zymomonas mobilis and microalgal biomass in biogas slurry wastewater was achieved, resulting in the production of ethanol at a rate of 0.4 g/L/h and a fixed fermentation CO2 of 3.1 g/L/d. Moreover, the amounts of algal biomass and chlorophyll a increased by over 50 % and two-fold, respectively. Through techno-economic analysis, the integrated process demonstrated its cost-effectiveness for cellulosic ethanol production. This study presents an innovative approach to a low-carbon circular bioeconomy. © 2024 Elsevier Ltd

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