(Montane et al., 1998). The world production of wheat grain in
2013/14 is estimated to be 683 million metric tons (http://
www.igc.int/downloads/gmrsummary/gmrsumme.pdf). WS contains
35–45% cellulose, 20–30% hemicellulose, and 8–15% lignin.
This makes WS an attractive feedstock to be converted to ethanol
and other value-added products.
The production of ethanol from WS generally involves four
main steps – feedstock pretreatment, enzymatic saccharification,
fermentation, and product recovery. Integration of two or more
process steps is important for simplification of the process and
reduction of production cost. To this effect, simultaneous saccharification
and fermentation (SSF) of the pretreated lignocellulosic
feedstock is considered to be an ideal integrated process for ethanol
production. It offers distinct advantages over separate hydrolysis
and fermentation (SHF) in the production of ethanol from
lignocellulosic feedstock. It can improve the ethanol yield by
eliminating end-product inhibition of cellulose hydrolysis. The
microorganism can utilize the sugars for growth and ethanol
(Montane et al., 1998). The world production of wheat grain in2013/14 is estimated to be 683 million metric tons (http://www.igc.int/downloads/gmrsummary/gmrsumme.pdf). WS contains35–45% cellulose, 20–30% hemicellulose, and 8–15% lignin.This makes WS an attractive feedstock to be converted to ethanoland other value-added products.The production of ethanol from WS generally involves fourmain steps – feedstock pretreatment, enzymatic saccharification,fermentation, and product recovery. Integration of two or moreprocess steps is important for simplification of the process andreduction of production cost. To this effect, simultaneous saccharificationand fermentation (SSF) of the pretreated lignocellulosicfeedstock is considered to be an ideal integrated process for ethanolproduction. It offers distinct advantages over separate hydrolysisand fermentation (SHF) in the production of ethanol fromlignocellulosic feedstock. It can improve the ethanol yield byeliminating end-product inhibition of cellulose hydrolysis. Themicroorganism can utilize the sugars for growth and ethanol
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