Method of producing alcohol from cellulose-containing biomass

A method of producing alcohol from cellulose-containing biomass, comprising steps (1) to (8):

• step (1):
• pretreating a cellulose-containing biomass;
• step (2):
• saccharifying the pretreated cellulose-containing biomass obtained in step (1) with a saccharification enzyme;
• step (3):
• removing a saccharification residual solid from a saccharification treated product obtained in step (2);
• step (4):
• culturing an alcohol fermentation microorganism with an aqueous sugar solution obtained in step (3) as a fermentation raw material;
• step (5):
• removing the alcohol fermentation microorganism from a culture liquid containing the alcohol fermentation microorganism obtained in step (4) by centrifugation or microfiltration separation;
• step (6):
• distilling the alcohol fermentation liquid obtained in step (5) to recover alcohol;
• step (7):
• passing and filtering a distillation residual liquid obtained in step (6) through a reverse osmosis membrane;
• and
• step (8):
• performing biological treatment of discharging a retentate obtained in step (7).

A method of producing alcohol from cellulose-containing biomass, the method comprising steps (1) to (8):

• step (1):
• pretreating a cellulose-containing biomass;
• step (2):
• saccharifying the pretreated cellulose-containing biomass obtained in step (1) with a saccharification enzyme;
• step (3):
• removing a saccharification residual solid from a saccharification treated product obtained in step (2) with a filter press;
• step (4):
• culturing an alcohol fermentation microorganism with an aqueous sugar solution obtained in step (3) as a fermentation raw material;
• step (5):
• removing the alcohol fermentation microorganism from a culture liquid containing the alcohol fermentation microorganism obtained in step (4) by centrifugation or microfiltration separation;
• step (6):
• distilling the alcohol fermentation liquid obtained in step (5) to recover alcohol;
• step (7):
• passing and filtering a distillation residual liquid obtained in step (6) through a reverse osmosis membrane;
• and
• step (8):
• performing biological treatment of discharging a retentate obtained in step (7).