BioChem - DOS

Carbon capture and utilization of fermentation CO2: Integrated ethanol fermentation and succinic acid production as an efficient platform

Applied energy

Zhang, Quanguo; Nurhayati, Quanguo; Cheng, Chieh-Lun; Nagarajan, Dillirani; Chang, Jo-Shu; Hu, Jianjun; Lee, Duu-Jong

<P><B>Abstract</B></P> <P>Dark fermentative bioethanol production process yields carbon dioxide (CO<SUB>2</SUB>) and organic acids as by-products. The so-yielded CO<SUB>2</SUB> is a nearly saturated gas of high CO<SUB>2</SUB> purity, which is commonly utilized in food industries as supplements. The potential utilization pathways for the CO<SUB>2</SUB> generated and released from the ethanol fermentation process (denoted as &ldquo;fermentation CO<SUB>2</SUB>&rdquo;) include production of biofuels by CO<SUB>2</SUB> fixation of microalgae and succinic acid fermentation by non-photosynthetic microorganisms. This study compared the performances of these two CO<SUB>2</SUB> fixing pathways using <I>Chlorella vulgaris</I> or <I>Actinobacillus succinogenes</I> cultures. The highest carbon fixation rate achieved by <I>Actinobacillus succinogenes</I> was 388.8g/L-d in 2-L reactor, which is about 188 times to that by <I>Chlorella vulgaris</I> (2.06g/L-d) in the reactor at the same volume. This study ultimately demonstrated the advantages of adopting succinic acid production process compared to those frequently addressed in literature using microalgae-based biofuels.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CO<SUB>2</SUB> generated and released from ethanol fermentation process was captured. </LI> <LI> <I>C. vulgaris</I> and <I>A. succinogenes</I> were used to capture the fermentation CO<SUB>2</SUB>. </LI> <LI> CO<SUB>2</SUB> fixation rate of <I>C. vulgaris</I> was 2.06g/L-d with 1.2g/L biomass production. </LI> <LI> The highest CO<SUB>2</SUB> rate by <I>A. succinogenes</I> was 388.8g/L-d in 2-L reactor. </LI> <LI> Carbon fixation by <I>A. succinogenes</I> is 188 times higher than that of <I>C. vulgaris.</I> </LI> </UL> </P>

2017

Elsevier

0306-2619

1872-9118

206

pp.364-371

10.1016/j.apenergy.2017.08.193

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART78902746

Bioethanol; Microalgae; Succinic acid; Carbon capture; Fixation