| abstract |
Provided is a method for producing a concentrated aqueous sugar solution, said method comprising hydrolyzing a cellulose-containing biomass to give an aqueous sugar solution, treating the aqueous sugar solution with a microfiltration membrane and/or an ultrafiltration membrane to remove the biomass residue, and then concentrating the aqueous sugar solution by treating the same with a reverse osmosis membrane to increase the sugar concentration, wherein permeated water discharged from the reverse osmosis membrane is recovered and reused to thereby save water. |