Abstract

Algal biomass, including both macroalgae and microalgae, could be potentially converted to biobutanol, an advanced liquid biofuel having potential to replace petroleum-based fuels. Biobutanol can be produced from biomass via Clostridium sp. acetone-butanol-ethanol (ABE) fermentation pathway, which is a complex two-phase heterofermentation of acidogenesis and solventogenesis. Having faster growth and being highly tolerant to poor environmental conditions, algae as the third generation of biomass for biofuel production is considered the promising feedstock for ABE production. However, traditional ABE fermentation is limited by low productivity due to violent inhibition caused by butanol concentration in fermentation broth higher than 2% (w/v). In situ separation is then required to effectively proceed the ABE fermentation. Thus this chapter is purposive of the technical direction of conversion of algae to biobutanol liquid biofuel, including potential of algal biomass feedstock, principles of ABE fermentation, and factors affecting butanol production, fermentation type and reactor configuration, and butanol recovery from fermentation broth.

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