Bioscience Evidence 2024, Vol.14, No.5, 238-249 http://bioscipublisher.com/index.php/be 243 Figure 2 Integrated chemo and bio-catalytic approaches for advanced biofuel production from ABE fermentation (Adopted from Shanmugam et al., 2023) 6.2 Fermentation technology innovations Innovations in fermentation technology have focused on consolidated bioprocessing (CBP) and simultaneous saccharification and fermentation (SSF). CBP technologies, particularly for raw starch, have been developed using amylolytic Saccharomyces cerevisiae strains. These advancements have led to improved enzyme combinations, alternative feedstocks, and novel host strains, although further research is needed for industrial-scale application (Cripwell et al., 2020). SSF has also been applied to lignocellulosic biomass, addressing challenges such as the recalcitrance of biomass and the need for efficient pretreatment technologies. The integration of saccharification and fermentation processes has been refined to enhance ethanol yields and reduce energy consumption (Liu et al., 2019). 6.3 Integration with other biotechnologies The integration of ethanol fermentation with other biotechnologies has opened new avenues for sustainable production. Gas fermentation using carbon-fixing microorganisms has been commercialized, offering a scalable solution for converting waste gases to ethanol. This process leverages genetic tool development and metabolic engineering to expand the product spectrum and improve strain development for acetogens and other nonmodel organisms (Fackler et al., 2021). Additionally, the use of sequential fermentations, where acetogenic bacteria convert C1 compounds into acetate and ethanol, followed by further conversion into higher-value products by aerobic organisms, has shown promise in creating a sustainable biotechnology framework (Stark et al., 2022). 6.4 Scale-up challenges and solutions Scaling up ethanol fermentation processes from laboratory to industrial scales presents several challenges, including maintaining efficiency and yield. Single-step ethanol production from raw cassava starch has been successfully scaled up from 5-L laboratory fermenters to 3000-L industrial fermenters, achieving high yields and
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