Todhanakasem, Tatsaporn

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Todhanakasem, Tatsaporn
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tatsaporn.to@kmitl.ac.th

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    Item type:Publication,
    Economic co-production of cellulosic ethanol and microalgal biomass through efficient fixation of fermentation carbon dioxide
    (2024-03-01)
    Liu, Linpei
    ;
    Zhou, Zheng
    ;
    Gong, Guiping
    ;
    Wu, Bo
    ;
    Todhanakasem, Tatsaporn
    An integrated process for the co-production of cellulosic ethanol and microalgal biomass by fixing CO<inf>2</inf> generated from bioethanol fermentation is proposed. Specifically, over one-fifth of the fermentative carbon was converted into high-purity CO<inf>2</inf> during ethanol production. The optimal concentration of 4 % CO<inf>2</inf> was identified for the growth and metabolism of Chlorella sp. BWY-1. A multiple short-term intermittent CO<inf>2</inf> supply system was established to efficiently fix and recycle the waste CO<inf>2</inf>. 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 CO<inf>2</inf> 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.