| abstract |
Provided is a method for removing, during a step for producing a sugar solution, a fermentation inhibiting substance, which is generated during a step for producing sugar from a cellulose-containing biomass. Also provided is a method for steadily generating a pure sugar solution, which has an extremely low content of a fermentation inhibiting substance, over a long period of time. Specifically, disclosed is a method for producing a pure sugar solution, which uses a cellulose-containing biomass as the starting material and which involves: a step (1) for producing a sugar solution by subjecting a cellulose-containing biomass to decomposition treatment; a step (2) for subjecting the sugar solution obtained in step (1) to coagulation treatment; a step (3) for filtering the sugar solution obtained in step (2) by means of a microfiltration membrane and/or an ultra-filtration membrane, and for collecting the sugar solution from the permeate side; and a step (4) for filtering the sugar solution obtained in step (3) by means of a nano-filtration membrane and/or a reverse osmosis membrane, for collecting the pure sugar solution from the non-permeate side, and for removing a fermentation inhibiting substance from the permeate side. |