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Subject: search.filters.subject.CO2 fixation

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    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.
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    Enhanced growth and hydrocarbon production of Botryococcus braunii KMITL 2 by optimum carbon dioxide concentration and concentration-dependent effects on its biochemical composition and biodiesel properties
    (2017-01-01)
    Ruangsomboon, Suneerat
    ;
    Prachom, Noratat
    ;
    Sornchai, Piyanast
    The purposes of this study were to find the optimum level of supplementing CO<inf>2</inf> for increasing the biomass and hydrocarbon production of B. braunii KMITL 2 (A race) and to determine the effects of CO<inf>2</inf> level on CO<inf>2</inf> fixation and biodiesel properties. The experimental results showed that the alga supplemented with 10% CO<inf>2</inf> produced the highest biomass (1.48 ± 0.02 g L<sup>−1</sup>) and CO<inf>2</inf> fixation rate (100.43 ± 1.42 mg L<sup>−1</sup> d<sup>−1</sup>) that were 2.7 and 5.3 times higher than the control (0.04% CO<inf>2</inf>). The gravimetric hydrocarbon content (36.82 ± 3.39%) and hydrocarbon titer (0.35 ± 0.03 g L<sup>−1</sup>) of the alga supplemented with 5% CO<inf>2</inf> were 1.6 and 2.7 times higher than the control. Cultivation of this strain under 5% CO<inf>2</inf> gave the highest hydrocarbon yield and good biodiesel properties with the lowest iodine value and a higher CN value than the ASTM D6751 and EN 14214 fuel standards.