Page 230 - Lignocellulosic Biomass to Liquid Biofuels

186 Lignocellulosic Biomass to Liquid Biofuels

Figure 5.4 Schematic representation of microbial pathways of acid and solvent for-
mation in ABE fermentation in Clostridia species. ABE, Acetone, butanol, and ethanol.

biobutanol with high purity. The high abundance and possibility of using
waste cellulosic materials from agricultural and forest residues as feedstocks
aids a new pathway in the production of biobutanol at industrial scale.
The genetic engineering methods for the microbial strain improvement
with supplement of biobutanol-producing gene of Clostridia in high
butanol-tolerant microorganisms lead to substantial biobutanol produc-
tion, which is a great opportunity. Recently, some researchers are investi-
gating the aerobic production of biobutanol using some genetically
engineered microorganisms. However, the emerging scope of process
growth could be explored in developing novel continuous system, feed-
stock pretreatment, and efficient integrated biobutanol recovery for
improving the productivity of biobutanol fermentation. Therefore more
research, pertaining to the drawbacks, is required for the manipulation of
these techniques, and consequently, the industrial-scale production of bio-
fuels could be achieved. However, looking into the coming future, the